CN108321955A

CN108321955A - Rotor structure, permanent magnetism assist in synchronization reluctance motor and electric vehicle

Info

Publication number: CN108321955A
Application number: CN201810219856.6A
Authority: CN
Inventors: 陈彬; 胡余生; 肖勇; 童童; 卢素华
Original assignee: Zhuhai Gree Energy Saving Environmental Protection Refrigeration Technology Research Center Co Ltd
Current assignee: Zhuhai Gree Energy Saving Environmental Protection Refrigeration Technology Research Center Co Ltd
Priority date: 2018-03-16
Filing date: 2018-03-16
Publication date: 2018-07-24
Anticipated expiration: 2038-03-16
Also published as: CN108321955B; WO2019174313A1

Abstract

The present invention provides a kind of rotor structures, permanent magnetism assist in synchronization reluctance motor and electric vehicle, rotor structure includes rotor body, magnetic slot group is offered on rotor body, magnetic slot group includes internal layer magnetic slot, internal layer magnetic slot includes the first internal layer magnetic slot section set gradually, second internal layer magnetic slot section and third internal layer magnetic slot section, the second arc-shaped structure of internal layer magnetic slot section, the shaft hole side of curved portion towards the rotor body of second internal layer magnetic slot section is projectedly arranged, second internal layer magnetic slot section is symmetrically arranged about the d-axis of rotor body, the end sidewalls extended line at the both ends of the second internal layer magnetic slot section intersects at point Q with d-axis.Point Q is intersected at by the end sidewalls extended line at both ends and the d-axis of rotor body that the second internal layer magnetic slot section is arranged, it is allowed to improve motor q axle inductance intensity, increase electric efficiency, reduce motor torque ripple, reduce vibration and the noise of motor, electric efficiency is improved, the anti-demagnetization capability of motor is improved.

Description

Rotor structure, permanent magnetism assist in synchronization reluctance motor and electric vehicle

Technical field

The present invention relates to motor device technical fields, in particular to a kind of rotor structure, permanent magnetism assist in synchronization magnetic resistance Motor and electric vehicle.

Background technology

Electric vehicle has the characteristics that energy-saving and environmental protection, has obtained rapid development.Existing driving motor for electric automobile is Realize that the functions such as high power density, the high efficiency of motor, more and more motors use high-performance rare-earth permanent-magnetic motor.Rare earth Magneto can realize high efficiency and high power density, depend on high performance rare-earth permanent magnet, and application is most at present Be Fe-B rare-earth permanent magnet.But rare earth is a kind of non-renewable resources, price costly, and the fluctuation of rare earth price Also larger, cause the production cost of driving motor for electric automobile higher, this is very not for pushing electric vehicle development in an all-round way Profit.Further, ferrite permanent-magnet assist in synchronization reluctance motor is also applied to electric vehicle, but this kind in the prior art The problems such as there are noises for motor greatly, easily demagnetizes, efficiency is low.

Invention content

The main purpose of the present invention is to provide a kind of rotor structure, permanent magnetism assist in synchronization reluctance motor and electric vehicle, To solve the problems, such as that electric efficiency is low in the prior art.

To achieve the goals above, according to an aspect of the invention, there is provided a kind of rotor structure, including：Rotor sheet Body offers magnetic slot group on rotor body, and magnetic slot group includes internal layer magnetic slot, and internal layer magnetic slot includes set gradually One internal layer magnetic slot section, the second internal layer magnetic slot section and third internal layer magnetic slot section, the second arc-shaped structure of internal layer magnetic slot section, The shaft hole side of curved portion towards the rotor body of second internal layer magnetic slot section is projectedly arranged, and the second internal layer magnetic slot section is closed It is symmetrically arranged in the d-axis of rotor body, the end sidewalls extended line at the both ends of the second internal layer magnetic slot section is intersected at d-axis Point Q.

Further, magnetic slot group includes outer layer magnetic slot, and outer layer magnetic slot is disposed adjacently with internal layer magnetic slot, outer layer Magnetic conduction channel is formed between magnetic slot and internal layer magnetic slot, outer layer magnetic slot is located on the outside of internal layer magnetic slot.

Further, outer layer magnetic slot includes multiple magnetic slot sections, and multiple magnetic slot sections include：First outer layer magnetic slot The shaft hole of section, the first end of the first outer layer magnetic slot section towards rotor body is extended, and the of the first outer layer magnetic slot section The outer edge of two ends towards rotor body is extended, and the first outer layer magnetic slot section is located at the first side of d-axis；Second outer layer magnetic Steel tank section, the second outer layer magnetic slot section are oppositely disposed and are located at opposite with the first side of d-axis with the first outer layer magnetic slot section The shaft hole of the second side, first end towards the rotor body of the second outer layer magnetic slot section is extended, the second outer layer magnetic slot section Second end towards rotor body outer edge be extended.

Further, outer layer magnetic slot further includes：First folding slot, the first end of the first folding slot and the first outer layer magnetic slot section Second end be connected, the outer edge of second end towards the rotor body of the first folding slot extends and is gradually distance from d-axis.

Further, outer layer magnetic slot further includes：Second folding slot, the first end of the second folding slot and the second outer layer magnetic slot section Second end be connected, the outer edge of second end towards the rotor body of the second folding slot extends and is gradually distance from d-axis.

Further, multiple magnetic slot sections further include：Third outer layer magnetic slot section, the first end of third outer layer magnetic slot section It is connected with the first end of the first outer layer magnetic slot section, the second end of third outer layer magnetic slot section and the second outer layer magnetic slot section First end is connected.

Further, the first outer layer magnetic slot section, the second outer layer magnetic slot section and third outer layer magnetic slot section form V-arrangement knot Structure magnetic slot, alternatively, the first outer layer magnetic slot section, the second outer layer magnetic slot section and third outer layer magnetic slot section form U-shaped structure Magnetic slot.

Further, outside the midpoint and first of the side wall at the outer edge of the close rotor body of the second end of the first folding slot The distance of the geometric center lines of layer magnetic slot section is D3, and the width of the end of the second end of the first outer layer magnetic slot section is M, In, 0.6M≤D3.

Further, the first magnetic bridge is formed between the second end and the outer edge of rotor body of the first folding slot, wherein 0.4 × M≤(H-H1), alternatively, 0.4 × M≤(H-H1)≤2 × M, M are the end of the second end of the first outer layer magnetic slot section Width, H be the first outer layer magnetic slot section second end to rotor body outer edge distance, H1 be the first magnetic bridge width Degree.

Further, the first internal layer magnetic slot section, the second internal layer magnetic slot section and third internal layer magnetic slot section are spaced successively Ground is arranged, and the second magnetic bridge, the second internal layer magnetic slot are formed between the first internal layer magnetic slot section and the second internal layer magnetic slot section It is formed with third magnetic bridge between section and third internal layer magnetic slot section.

Further, rotor structure further includes：Arc-shaped permanent magnet, arc-shaped permanent magnet are set to the second internal layer magnetic slot section Interior, magnetic direction and the d-axis of arc-shaped permanent magnet meet at point Q.

Further, the distance between the both ends of arc-shaped permanent magnet and the second magnetic bridge are L1, wherein L1≤0.2mm.

Further, rotor structure further includes：First internal layer permanent magnet, the first internal layer permanent magnet are set to the first internal layer magnetic In steel tank section, the first internal layer permanent magnet is parallelly set close to the surface of the second magnetic bridge side and the sideline of the second magnetic bridge It sets.

Further, the first internal layer permanent magnet close to the second magnetic bridge side surface and the second magnetic bridge between away from From for L1, wherein L1≤0.2mm.

Further, rotor structure further includes：Third internal layer permanent magnet, third internal layer permanent magnet are set to third internal layer magnetic In steel tank section, the surface of close third magnetic bridge side and the sideline of third magnetic bridge of third internal layer permanent magnet are parallelly set It sets.

Further, between the surface and third magnetic bridge of the close third magnetic bridge side of third internal layer permanent magnet away from From for L3, wherein L3≤0.2mm.

Further, the width of the second magnetic bridge and/or third magnetic bridge is gradual outward along the radial direction of rotor body Reduce.

Further, rotor structure further includes the first internal layer permanent magnet, and the first internal layer permanent magnet is set to the first internal layer magnetic In steel tank section, the first internal layer permanent magnet and third internal layer permanent magnet are rectangular permanent magnet.

Further, rotor structure further includes arc-shaped permanent magnet, and arc-shaped permanent magnet is set in the second internal layer magnetic slot section, The magnetic direction of arc-shaped permanent magnet comes together between the inner arc shaft hole of arc-shaped permanent magnet and the outer arc shaft hole of arc-shaped permanent magnet Line on.

Further, the U-shaped profile structure along rotor body radial direction of internal layer magnetic slot, internal layer magnetic slot Both ends are symmetrically arranged about the first geometric center lines of the radial direction of internal layer magnetic slot.

Further, the diameter along rotor body of the first geometric center lines and outer layer magnetic slot of the second internal layer magnetic slot section The second geometric center lines to direction are conllinear.

Further, the V-shaped structure in cross section of the radial direction along rotor body of outer layer magnetic slot, outer layer magnetic slot First end the second geometric center lines of direction side wall extended line and outer layer magnetic slot second end the second geometry of direction The extended line of the side wall of center line intersects to form the first angle α 1, wherein × α ＜ α 1≤× α, α are positioned at internal layer magnetic slot Outside magnetic conduction channel polar arc angle.

Further, the extended line of the side wall towards outer layer magnetic slot of the first internal layer magnetic slot section and third internal layer magnet steel The extended line of the side wall towards outer layer magnetic slot of slot section intersects to form the first angle α 2, wherein 0≤α 2- α 1≤(1/15) ×α。

Further, the junction of the first internal layer magnetic slot section and third internal layer magnetic slot section and towards internal layer magnetic slot The arc-shaped structure of side wall, the center of circle of arcuate structure are identical as the center of circle of the second internal layer magnetic slot section.

Further, rotor structure further includes：Internal layer permanent magnet, internal layer permanent magnet are set in internal layer magnetic slot；Outer layer Permanent magnet, outer layer permanent magnet are set in outer layer magnetic slot, and the thickness of internal layer permanent magnet is H2, and the thickness of outer layer permanent magnet is H, Wherein, 0.2 × H≤H2-H≤0.3 × H.

Further, the thickness of arc-shaped permanent magnet is H1, and the thickness of the first internal layer permanent magnet or third internal layer permanent magnet is H21, wherein H1-H21=t, wherein t ∈ [0.1 × H1,0.3 × H1].

Further, at the outer edge of the close rotor body of the first internal layer permanent magnet and/or third internal layer permanent magnet End set has trimming.

Further, rotor structure further includes：Stator body is provided with multiple stator tooths on the inner peripheral surface of stator body, Multiple stator tooths include the first stator tooth and the second stator tooth, and the first stator tooth is positioned apart from the second stator tooth, in first The end of layer permanent magnet is oppositely disposed with the first stator tooth, and end and the second stator tooth of third internal layer permanent magnet are relatively set Set, the end set of the separate outer layer permanent magnet of the first internal layer permanent magnet has the first trimming, third internal layer permanent magnet far from outer The end set of layer permanent magnet has the second trimming.

Further, multiple stator tooths further include third stator tooth and the 4th stator tooth, third stator tooth and the first stator Tooth is disposed adjacently, and the distance of third stator tooth to the first geometric center lines is more than the first stator tooth to the first geometric center lines Distance, the 4th stator tooth are disposed adjacently with the second stator tooth, and the distance of the 4th stator tooth to the first geometric center lines is more than the The distance of two stator tooths to the first geometric center lines；Wherein, the distance between the first trimming and the second trimming are L1, the first stator The table far from the first geometric center lines on the surface and the end of the second stator tooth far from the first geometric center lines of the end of tooth The distance between face is L2, the end close to the surface and the 4th stator tooth of the first geometric center lines of the end of third stator tooth Close to the distance between surface of the first geometric center lines be L3, L2 ＜ L1 ＜ L3.

Further, outer layer permanent magnet includes：First outer layer permanent magnet, the first outer layer permanent magnet are set to outer layer magnetic slot Interior, the first end of the first outer layer permanent magnet is towards being extended at shaft hole, and the second end of the first outer layer permanent magnet is towards rotor The outer edge of ontology is extended；Second outer layer permanent magnet, the second outer layer permanent magnet are set in outer layer magnetic slot, the second outer layer The first end of permanent magnet is extended towards at shaft hole, the outer edge of the second end of the second outer layer permanent magnet towards rotor body It is extended, the first outer layer permanent magnet is symmetrically arranged with the second outer layer permanent magnet about the second geometric center lines.

Further, rotor structure further includes：Stator body is provided with multiple stator tooths on the inner peripheral surface of stator body, Multiple stator tooths further include the 5th stator tooth, the 5th stator tooth between the first outer layer permanent magnet and the second outer layer permanent magnet, Multiple stator tooths further include the 6th stator tooth and the 7th stator tooth, and the 6th stator tooth is disposed adjacently with the 5th stator tooth, and first The end of outer layer permanent magnet is oppositely disposed with the 5th stator tooth, and the 6th stator tooth is disposed adjacently with the 5th stator tooth, and second The end of outer layer permanent magnet is oppositely disposed with the 6th stator tooth.

Further, the side wall of the farthest of the separate internal layer magnetic slot of outer layer magnetic slot and the second geometric center lines of distance On point and the central angle that is formed of line of shaft hole be α 3, the 6th stator tooth and the 7th stator tooth close to the 5th stator tooth The central angle that the line in the center of circle of side wall and rotor body is formed is α 4, the both ends of the line of the maximum width of the 5th stator tooth The central angle formed with the line of shaft hole is α 5, wherein 5 ＜ α of α, 3 ＜ α 4.

According to another aspect of the present invention, a kind of permanent magnetism assist in synchronization reluctance motor, including rotor structure, rotor are provided Structure is above-mentioned rotor structure.

According to another aspect of the present invention, a kind of electric vehicle, including rotor structure are provided, rotor structure is above-mentioned Rotor structure.

Apply the technical scheme of the present invention, by be arranged the second internal layer magnetic slot section both ends end sidewalls extended line with The d-axis of rotor body intersects at point Q, is allowed to improve motor q axle inductance intensity, increases electric efficiency, reduces motor torque arteries and veins It is dynamic, vibration and the noise of motor are reduced, electric efficiency is improved, improves the anti-demagnetization capability of motor.

Description of the drawings

Fig. 1 shows the schematic cross-sectional view of the embodiment one of rotor structure according to the present invention；

Fig. 2 shows the schematic cross-sectional views of the embodiment two of rotor structure according to the present invention；

Fig. 3 shows the schematic cross-sectional view of the embodiment three of rotor structure according to the present invention；

Fig. 4 shows the schematic cross-sectional view of the example IV of rotor structure according to the present invention；

Fig. 5 shows the schematic cross-sectional view of the embodiment five of rotor structure according to the present invention；

Fig. 6 shows the schematic cross-sectional view of the embodiment six of rotor structure according to the present invention；

Fig. 7 shows the structural schematic diagram of the embodiment seven of rotor structure according to the present invention；

Fig. 8 shows the structural representation of the rotor of rotor structure according to the present invention and the embodiment of stator assembling structure Figure.

Fig. 9 shows that the inside and outside layer magnetic slot area ratio of rotor structure influences schematic diagram to magnetic linkage；

Figure 10 shows the permanent magnetism body thickness accounting of rotor structure and the schematic diagram of torque relationship；

Figure 11 shows schematic diagram of the magnetic slot end folding slot length to influence on Harmonic Armature of rotor structure；

Figure 12 shows the schematic diagram that the folding slot terminal end width of rotor structure according to the present invention influences the parameter of electric machine.

Wherein, above-mentioned attached drawing includes the following drawings label：

10, rotor body；11, outer layer magnetic slot；12, internal layer magnetic slot；13, shaft hole；

111, the first outer layer magnetic slot section；112, the second outer layer magnetic slot section；113, the first folding slot；114, the second folding slot； 115, third outer layer magnetic slot section；

121, the first internal layer magnetic slot section；122, the second internal layer magnetic slot section；123, third internal layer magnetic slot section；

124, third rolls over slot；125, four fold slot；

20, outer layer permanent magnet；21, the first outer layer permanent magnet；22, the second outer layer permanent magnet；

30, internal layer permanent magnet；31, arc-shaped permanent magnet；32, the first internal layer permanent magnet；321, the first trimming；33, in third Layer permanent magnet；331, the second trimming；

40, stator body；41, the first stator tooth；42, the second stator tooth；43, third stator tooth；44, the 4th stator tooth； 45, the 5th stator tooth；46, the 6th stator tooth；47, the 7th stator tooth；

51, the first magnetic bridge；52, the second magnetic bridge；53, third magnetic bridge.

Specific implementation mode

It should be noted that in the absence of conflict, the features in the embodiments and the embodiments of the present application can phase Mutually combination.The present invention will be described in detail below with reference to the accompanying drawings and embodiments.

In conjunction with shown in Fig. 1 to Figure 12, according to an embodiment of the invention, a kind of rotor structure is provided.

Specifically, which includes rotor body 10, and magnetic slot group is offered on rotor body 10, and magnetic slot group includes interior Layer magnetic slot 12, internal layer magnetic slot 12 include the first internal layer magnetic slot section 121, the second internal layer magnetic slot section 122 set gradually With third internal layer magnetic slot section 123,122 arc-shaped structure of the second internal layer magnetic slot section, the arc of the second internal layer magnetic slot section 122 The shaft hole side of portion towards rotor body 10 is projectedly arranged, and the second internal layer magnetic slot section 122 is about the straight of rotor body 10 Axisymmetrically it is arranged, end sidewalls extended line and the d-axis at the both ends of the second internal layer magnetic slot section 122 intersect at point Q.

In the present embodiment, pass through the end sidewalls extended line and rotor body at the both ends of the second internal layer magnetic slot section of setting D-axis intersect at point Q, be allowed to improve permanent magnetism assist in synchronization reluctance motor (hereinafter referred to as motor) q axle inductance intensity, increase Electric efficiency reduces motor torque ripple, reduces vibration and the noise of motor, improves electric efficiency, improves the anti-demagnetization of motor Ability.

As shown in Figure 1, magnetic slot group includes outer layer magnetic slot 11, outer layer magnetic slot 11 is adjacent to internal layer magnetic slot 12 to be set It sets, forms magnetic conduction channel between outer layer magnetic slot 11 and internal layer magnetic slot 12, outer layer magnetic slot 11 is located at outside internal layer magnetic slot 12 Side.Setting can make the guiding of the magnetic line of force better in this way, obtain the q axle inductances of bigger.

In the present embodiment, outer layer magnetic slot 11 includes multiple magnetic slot sections, and multiple magnetic slot sections include the first outer layer magnetic Steel tank section and the second outer layer magnetic slot section.The shaft hole of first end towards the rotor body 10 of first outer layer magnetic slot section 111 prolongs Setting is stretched, the outer edge of second end towards the rotor body 10 of the first outer layer magnetic slot section 111 is extended, the first outer layer magnet steel Slot section 111 is located at the first side of d-axis.Second outer layer magnetic slot section 112 and the first outer layer magnetic slot section 111 are oppositely disposed simultaneously Positioned at the second side opposite with the first side of d-axis, the first end of the second outer layer magnetic slot section 112 turns towards rotor body 10 Axis hole is extended, and the outer edge of second end towards the rotor body 10 of the second outer layer magnetic slot section 112 is extended.It sets in this way It sets and is efficiently imported convenient for the magnetic line of force in magnetic conduction channel.

Further, outer layer magnetic slot 11 further includes the first folding slot 113, first end and the first outer layer of the first folding slot 113 The second end of magnetic slot section 111 is connected, and the outer edge of the second end of the first folding slot 113 towards rotor body 10 extends and gradual Far from d-axis.Setting can make the guiding of the magnetic line of force better in this way, obtain the q axle inductances of bigger.

In addition, outer layer magnetic slot 11 further includes the second folding slot 114, the first end of the second folding slot 114 and the second outer layer magnet steel The second end of slot section 112 is connected, and the outer edge of second end towards the rotor body 10 of the second folding slot 114 extends and is gradually distance from D-axis.Setting can make the guiding of the magnetic line of force better in this way, obtain the q axle inductances of bigger.

In the present embodiment, multiple magnetic slot sections further include third outer layer magnetic slot section 115, third outer layer magnetic slot section 115 first end is connected with the first end of the first outer layer magnetic slot section 111, the second end of third outer layer magnetic slot section 115 with The first end of second outer layer magnetic slot section 112 is connected.Setting efficiently imports convenient for the magnetic line of force in magnetic conduction channel in this way.

Wherein, the first outer layer magnetic slot section 111, the second outer layer magnetic slot section 112 and the formation of third outer layer magnetic slot section 115 V-shaped structure magnetic slot, i.e., in the present embodiment, third outer layer magnetic slot section 115 are small v-shaped structure.Alternatively, the first outer layer magnet steel Slot section 111, the second outer layer magnetic slot section 112 and third outer layer magnetic slot section 115 form U-shaped structure magnetic slot, i.e., in this implementation In example, third outer layer magnetic slot section 115 is small U-shaped structure..Setting can preferably guide the stator magnetic line of force evenly in this way Into each magnetic conduction channel.

In the present embodiment, in the side wall at the outer edge of the close rotor body 10 of the second end of the first folding slot 113 Point is D3, the end of the second end of the first outer layer magnetic slot section 111 at a distance from the geometric center lines of the first outer layer magnetic slot section 111 The width in portion is M, wherein 0.6M≤D3.Setting can make the guiding of the magnetic line of force better in this way, obtain the q axis of bigger Inductance.

Wherein, the first magnetic bridge is formed between the second end and the outer edge of rotor body 10 of the first folding slot 113, wherein 0.4 × M≤(H-H1), alternatively, 0.4 × M≤(H-H1)≤2 × M, M are the end of the second end of the first outer layer magnetic slot section 111 Width, H be the first outer layer magnetic slot section 111 second end to rotor body 10 outer edge distance, H1 is first every magnetic The width of bridge 51.Setting can make the guiding of the magnetic line of force better in this way, obtain the q axle inductances of bigger.

In the present embodiment, the first internal layer magnetic slot section 121, the second internal layer magnetic slot section 122 and third internal layer magnetic slot Section 123 is positioned apart from successively, be formed between the first internal layer magnetic slot section 121 and the second internal layer magnetic slot section 122 second every Magnetic bridge 52 is formed with third magnetic bridge 53 between second internal layer magnetic slot section 122 and third internal layer magnetic slot section 123.It sets in this way Setting can utilize the magnetic field of permanent magnet that magnetic bridge is more saturated so that the axis magnetic line of force of stator is difficult to, by magnetic bridge, subtract The small axle inductance of motor, improves the reluctance torque of motor.

Further, rotor structure further includes arc-shaped permanent magnet 31, and arc-shaped permanent magnet 31 is set to the second internal layer magnetic slot In section 122, magnetic direction and the d-axis of arc-shaped permanent magnet 31 meet at point Q.By the way that permanent magnet side line is directed toward magnetic field center point, The local demagnetization that permanent magnet end can be effectively reduced promotes the anti-demagnetization capability of motor, increases the reliability of motor.

Wherein, the distance between the both ends of arc-shaped permanent magnet 31 and the second magnetic bridge 52 are L1, wherein L1≤0.2mm.It is logical Increase permanent magnet compactedness is crossed, can utilize the magnetic field of permanent magnet that magnetic bridge is more saturated so that the axis magnetic line of force of stator It is difficult to reduce the axle inductance of motor by magnetic bridge, improves the reluctance torque of motor.

In the present embodiment, rotor structure further includes the first internal layer permanent magnet 32, and the first internal layer permanent magnet 32 is set to In one internal layer magnetic slot section 121, the surface of close second magnetic bridge, 52 side of the first internal layer permanent magnet 32 and the second magnetic bridge 52 sideline is set in parallel.It can utilize the magnetic field of permanent magnet that magnetic bridge is more saturated so that the axis magnetic line of force of stator It is difficult to reduce the axle inductance of motor by magnetic bridge, improves the reluctance torque of motor.

Further, surface and the second magnetic bridge 52 close to 52 side of the second magnetic bridge of the first internal layer permanent magnet 32 it Between distance be L1, wherein L1≤0.2mm.It can utilize the magnetic field of permanent magnet that magnetic bridge is more saturated so that stator The axis magnetic line of force is difficult to reduce the axle inductance of motor by magnetic bridge, improves the reluctance torque of motor.

In the present embodiment, rotor structure further includes third internal layer permanent magnet 33, and third internal layer permanent magnet 33 is set to In three internal layer magnetic slot sections 123, surface and the third magnetic bridge of close 53 side of third magnetic bridge of third internal layer permanent magnet 33 53 sideline is set in parallel.It can utilize the magnetic field of permanent magnet that magnetic bridge is more saturated so that the axis magnetic line of force of stator It is difficult to reduce the axle inductance of motor by magnetic bridge, improves the reluctance torque of motor.

In the present embodiment, the surface of close 53 side of third magnetic bridge of third internal layer permanent magnet 33 and third magnetic bridge The distance between 53 be L3, wherein L3≤0.2mm.It can utilize the magnetic field of permanent magnet that magnetic bridge is more saturated so that fixed The axis magnetic line of force of son is difficult to reduce the axle inductance of motor by magnetic bridge, improves the reluctance torque of motor.

In the present embodiment, the width or the second magnetic bridge 52 and third of the second magnetic bridge 52 or third magnetic bridge 53 The width of magnetic bridge 53, the radial direction along rotor body 10 are gradually reduced outward.Setting is effectively improved to have and be somebody's turn to do in this way The electric efficiency of the rotor structure of structure increases the anti-demagnetization capability of motor.

Wherein, rotor structure further includes the first internal layer permanent magnet 32, and the first internal layer permanent magnet 32 is set to the first internal layer magnetic In steel tank section 121, the first internal layer permanent magnet 32 and third internal layer permanent magnet 33 are rectangular permanent magnet.Setting is more advantageous to forever in this way The cooperation compactness of magnet and magnetic slot.

In the present embodiment, rotor structure further includes arc-shaped permanent magnet, and arc-shaped permanent magnet is set to the second internal layer magnetic slot In section, the magnetic direction of arc-shaped permanent magnet comes together in the inner arc shaft hole of arc-shaped permanent magnet and the outer arc shaft hole of arc-shaped permanent magnet Between line on.Setting is effectively improved the electric efficiency of the rotor structure with the structure in this way, increases motor Anti- demagnetization capability.

In the present embodiment, internal layer magnetic slot 12 and outer layer magnetic slot 11, internal layer magnetic slot are offered on rotor body 10 Magnetic conduction channel is formed between 12 and outer layer magnetic slot 11, internal layer magnetic slot 12 is in along the cross section of 10 radial direction of rotor body U-shaped structure is located at the both ends of the first geometric center lines of the radial direction along rotor body 10 of internal layer magnetic slot 12 about the One geometric center lines are symmetrically arranged.Using the technical solution so that the layout for the magnetic slot being arranged on rotor body is more Rationally, the effective area for improving the work for being set to ectonexine magnetic slot magnet steel, improves the permanent-magnet torque of rotor, Jin Erti The reluctance torque for having risen rotor structure, to improve the output torque of the rotor structure with the rotor structure.

In the present embodiment, internal layer magnetic slot 12 includes the second internal layer magnetic slot section 122, the second internal layer magnetic slot section 122 Curved portion towards being projectedly arranged at the shaft hole 13 of rotor body 10, in the first geometry of the second internal layer magnetic slot section 122 Heart line is conllinear with the second geometric center lines of the radial direction along rotor body 10 of outer layer magnetic slot 11.Setting ensures to turn in this way Sub- Distribution of Magnetic Field is uniform.

Further, the V-shaped structure in cross section of the radial direction along rotor body 10 of outer layer magnetic slot 11, outer layer magnetic The direction of the extended line of the side wall of the second geometric center lines of direction of the first end of steel tank 11 and the second end of outer layer magnetic slot 11 The extended line of the side wall of second geometric center lines intersects to form the first angle α 1, wherein (13/15) × α ＜ α 1≤(17/15) × α, α are the polar arc angle positioned at the outside magnetic conduction channel of internal layer magnetic slot 12.Setting makes rotor magnetic pole circumferentially in this way It is reasonably distributed so that rotor structure magnetic pole is symmetrical, reduces torque pulsation when rotor structure load, reduces rotor structure Vibration and noise.

Wherein, internal layer magnetic slot 12 includes the first internal layer magnetic slot section 121, the first end of the first internal layer magnetic slot section 121 It is connected with the first end of the second internal layer magnetic slot section 122, the second end of the first internal layer magnetic slot section 121 is along rotor body 10 Radial direction extends outwardly；Third internal layer magnetic slot section 123, first end and the second internal layer magnetic of third internal layer magnetic slot section 123 The second end of steel tank section 122 is connected, and the second end of third internal layer magnetic slot section 123 is outside along the radial direction of rotor body 10 Extend, extended line and the third internal layer magnetic slot section 123 of the side wall towards outer layer magnetic slot 11 of the first internal layer magnetic slot section 121 The extended line of the side wall towards outer layer magnetic slot 11 intersect to form the first angle α 2, wherein 0≤α 2- α, 1≤1/15 × α. Setting increases the effective area of magnet steel work in this way, improves permanent-magnet torque, and then improve the reluctance torque of rotor structure, To improve the output torque of rotor structure.

In the present embodiment, the junction of the first internal layer magnetic slot section 121 and third internal layer magnetic slot section 123 and towards interior The arc-shaped structure of side wall of layer magnetic slot 12, the center of circle of arcuate structure are identical as the center of circle of the second internal layer magnetic slot section 122.In this way Setting solves the problems, such as the excessive processing difficulties of U-shaped entirety magnet steel radian on rotor, also adds the effective area of magnet steel work, Permanent-magnet torque is improved, and then improves the reluctance torque of rotor structure.

In the present embodiment, rotor structure further includes：Internal layer permanent magnet 30, internal layer permanent magnet 30 are set to internal layer magnetic slot In 12；Outer layer permanent magnet 20, outer layer permanent magnet 20 are set in outer layer magnetic slot 11, and the thickness of internal layer permanent magnet 30 is H2, outside The thickness of layer permanent magnet 20 is H, wherein 0.2 × H≤H2-H≤0.3 × H.In this way setting can effectively improve permanent magnetism torque and It is cost performance highest that demagnetization current size, wherein thickness, which are set as 0.2 × H≤H2-H≤0.3 × H,.In addition, magnet steel can be with here Using ferrite permanent-magnet materials so that cost 30% can be reduced compared with prior art.

In addition, internal layer permanent magnet 30 includes arc-shaped permanent magnet 31, the first internal layer permanent magnet 32 and third internal layer permanent magnet 33, Arc-shaped permanent magnet 31 is set in the second internal layer magnetic slot section 122；First internal layer permanent magnet 32 is set to the first internal layer magnetic slot In section 121；Third internal layer permanent magnet 33 is set in third internal layer magnetic slot section 123, and the thickness of arc-shaped permanent magnet 31 is H1, the The thickness of one internal layer permanent magnet 32 or third internal layer permanent magnet 33 is H21, wherein H1-H21=t, wherein t ∈ [0.1 × H1, 0.3×H1].Setting can effectively promote permanent magnet torque and demagnetization current size, and cost performance highest in this way.

In the present embodiment, the close rotor body 10 of the first internal layer permanent magnet 32 and/or third internal layer permanent magnet 33 End set at outer edge has trimming.Setting can increase the anti-demagnetization capability of rotor in this way.In addition, the first internal layer permanent magnet 32 There can be trimming simultaneously with the end at the outer edge of the close rotor body 10 of third internal layer permanent magnet 33.

In the present embodiment, rotor structure further includes stator body 40, is provided on the inner peripheral surface of stator body 40 multiple Stator tooth, multiple stator tooths include the first stator tooth 41 and the second stator tooth 42, between the first stator tooth 41 and the second stator tooth 42 It is arranged every ground, the end of the first internal layer permanent magnet 32 is oppositely disposed with the first stator tooth 41, the end of third internal layer permanent magnet 33 Portion is oppositely disposed with the second stator tooth 42, and the end set of the separate outer layer permanent magnet 20 of the first internal layer permanent magnet 32 has first The end set of trimming 321, the separate outer layer permanent magnet 20 of third internal layer permanent magnet 33 has the second trimming 331.Setting can in this way So that generating more magnetic fluxs under identical excitation current, the reluctance torque of rotor structure is increased, rotor structure is improved Efficiency, and magnet steel trimming processing, enhance the anti-demagnetization capability of rotor.

Further, multiple stator tooths further include third stator tooth 43 and the 4th stator tooth 44, third stator tooth 43 and One stator tooth 41 is disposed adjacently, and the distance of 43 to the first geometric center lines of third stator tooth is more than the first stator tooth 41 to the first The distance of geometric center lines, the 4th stator tooth 44 are disposed adjacently with the second stator tooth 42,44 to the first geometry of the 4th stator tooth The distance of center line is more than the distance of 42 to the first geometric center lines of the second stator tooth；Wherein, the first trimming 321 and the second trimming The distance between 331 be L1, the surface of separate first geometric center lines of the end of the first stator tooth 41 and the second stator tooth 42 The distance between the surface far from the first geometric center lines of end be L2, the end of third stator tooth 43 close to more than the first The surface of what center line is L3, L2 close to the distance between surface of the first geometric center lines with the end of the 4th stator tooth 44 ＜ L1 ＜ L3.Setting can improve the first internal layer permanent magnet 32 and third internal layer permanent magnet of U-shaped both sides on rotor body in this way 33 and V-shape magnet steel the first outer layer permanent magnet 21 and the second outer layer permanent magnet 22 anti-demagnetization capability, further enhance The anti-demagnetization capability of rotor structure.

In the present embodiment, outer layer permanent magnet 20 include the first outer layer permanent magnet 21 and the second outer layer permanent magnet 22, first Outer layer permanent magnet 21 is set in outer layer magnetic slot 11, and the first end of the first outer layer permanent magnet 21 is set towards extending at shaft hole 13 It sets, the outer edge of second end towards the rotor body 10 of the first outer layer permanent magnet 21 is extended；Second outer layer permanent magnet 22 is set It is placed in outer layer magnetic slot 11, the first end of the second outer layer permanent magnet 22 is towards being extended at shaft hole 13, and the second outer layer is forever The outer edge of the second end of magnet 22 towards rotor body 10 is extended, the first outer layer permanent magnet 21 and the second outer layer permanent magnet 22 are symmetrically arranged about the second geometric center lines.Setting increases the effective area of magnet steel work in this way, and makes rotor The magnetic line of force is evenly distributed in magnetic field, and can provide more magnetic fluxs.Permanent-magnet torque is improved, and then improves rotor structure Reluctance torque, to improve the output torque of rotor structure.

Wherein, rotor structure further includes stator body 40, and multiple stator tooths are provided on the inner peripheral surface of stator body 40, more A stator tooth further includes the 5th stator tooth 45, and the 5th stator tooth 45 is located at the first outer layer permanent magnet 21 and the second outer layer permanent magnet 22 Between, multiple stator tooths further include the 6th stator tooth 46 and the 7th stator tooth 47, the 6th stator tooth 46 and 45 phase of the 5th stator tooth It is arranged adjacently, end and the 5th stator tooth 45 of the first outer layer permanent magnet 21 are oppositely disposed, and the 6th stator tooth 46 and the 5th is fixed Sub- tooth 45 is disposed adjacently, and end and the 6th stator tooth 46 of the second outer layer permanent magnet 22 are oppositely disposed.Setting can be in this way It effectively adjusts the magnetic line of force that stator generates and enters rotor so that produce more magnetic fluxs under identical excitation current.In turn Electromagnetic torque is provided, the output torque of rotor structure is promoted.

In the present embodiment, the separate internal layer magnetic slot 12 of outer layer magnetic slot 11 and the second geometric center lines of distance is farthest The central angle that the line of point on the side wall at place and shaft hole 13 is formed is α 3, and the 6th stator tooth 46 and the 7th stator tooth 47 lean on The central angle that the side wall of nearly 5th stator tooth 45 and the line in the center of circle of rotor body 10 are formed is α 4, and the 5th stator tooth 45 is most The central angle that the both ends of line at big width are formed with the line of shaft hole 13 is α 5, wherein 5 ＜ α of α, 3 ＜ α 4.It is arranged in this way The effective area for increasing magnet steel work, improves permanent-magnet torque, and then improve the reluctance torque of rotor structure.

Rotor structure in above-described embodiment can be also used for motor device technical field, i.e., another party according to the present invention Face, provides a kind of permanent magnetism assist in synchronization reluctance motor, including rotor structure, and rotor structure is above-mentioned rotor structure.

Rotor structure in above-described embodiment can be also used for vehicle arrangement technical field, i.e., another party according to the present invention Face, provides a kind of electric vehicle, including rotor structure, and rotor structure is above-mentioned rotor structure.

In the present embodiment, motor includes stator and rotor, contains placement magnetic slot on rotor and is placed on magnetic slot In permanent magnet, rotor includes multilayer permanent magnet on the same magnetic pole, and the permanent magnet in same magnetic pole has towards stator direction Identical polarity, magnetic slot are the shape of protrusion towards rotor inside, and the both ends of magnetic slot are close to rotor outer circle, the center of magnetic slot On the inside of the rotor, innermost layer permanent magnet 30 is by multistage set of permanent magnets at being arc-shaped permanent magnet, arcuate permanent magnetic on pole center line There is magnetic bridge, the magnetic direction of arc-shaped permanent magnet to be directed toward the shaft hole point being located on axis, permanent magnet side line for the end of body It is directed toward the shaft hole point, by the way that permanent magnet side line is directed toward magnetic field center point, the part of permanent magnet end can be effectively reduced Demagnetization, promotes the anti-demagnetization capability of motor, increases the reliability of motor.The center of the magnetic direction convergence of internal layer arc-shaped permanent magnet On the straightway that arc-shaped permanent magnet inner arc shaft hole and outer arc shaft hole are formed by connecting, the magnetic of bigger can be provided to air gap , unloaded magnetic linkage is promoted, electric current is reduced, reduces copper loss, promotes electric efficiency.

In the present embodiment, magnetic bridge thickness adjacent with arc-shaped permanent magnet end in internal layer permanent magnet 30 is unequal, from Rotor inside facing outward side becomes narrow gradually, and on the one hand reduces the stress concentration at magnetic bridge, can promote rotor mechanical strength, may be used also So that placing more permanent magnets in magnetic slot, the permanent-magnet torque of motor is promoted, and make the sideline side of permanent magnet end To closer to magnetizing direction, permanent magnet local demagnetization is reduced.

Further, the rectangular permanent magnet of motor both sides is flat close to the side line of magnetic bridge and adjacent magnetic bridge sideline Row, side line are less than 0.2mm at a distance from magnetic bridge, by increasing permanent magnet compactedness, the magnetic field of permanent magnet can be utilized to make It obtains magnetic bridge to be more saturated so that the axis magnetic line of force of stator is difficult to reduce the axle inductance of motor by magnetic bridge, improves electricity The reluctance torque of machine.

In the present embodiment, motor includes stator structure and rotor structure, and stator structure includes stator core and its insertion Stator winding, the permanent magnet placed magnetic slot and be placed in magnetic slot, the same magnetic pole of rotor are contained on rotor structure Upper includes multilayer permanent magnet, and the multilayer in this programme refers to that the number of plies is more than or equal to 2, and the permanent magnet in same magnetic pole is towards stator body 40 directions polarity having the same, magnetic slot have a shape towards rotor inner bulge, the both ends of magnetic slot close to rotor outer circle, The center of magnetic slot forms magnetic conduction channel, wherein one on the inside of rotor between arbitrary two adjacent magnetic slots in same magnetic pole A or multiple magnetic conduction channel ends have one section of turnover deflected towards 30 direction of internal layer permanent magnet, as shown in Fig. 1 and Fig. 4.

In the present embodiment, permanent magnetism assist in synchronization reluctance motor generates reluctance torque using the difference of cross, straight axle inductance, The permanent-magnet torque that permanent magnet can also be utilized to generate.Wherein it is possible to the d-axis electricity for increasing the quadrature axis inductance of motor, reducing motor Sense, can promote the reluctance torque of motor, the permanent-magnet torque of motor can be promoted by increasing the unloaded magnetic linkage of motor.Research finds electricity When machine stator ontology 40 is passed through the alternating current of three-phase symmetrical, the magnetic line of force on 40 each tooth of stator body is simultaneously uneven, closer to The position in line of demarcation, the magnetic line of force on 40 tooth of stator body are more.

As shown in Figure 1.By the way that one section of turnover deflected towards internal layer magnetic slot end, Ke Yiyou is arranged in magnetic conduction channel end The trend of effect guiding stator q axis magnetic lines of force f will enter the magnetic line of force in high magnetic saturation region originally, as entered magnet passage f2 in Fig. 8 The magnetic line of force, be changed to enter low magnetic saturation region, such as the magnet passage f1 in Fig. 8, be produced under identical excitation current more Magnetic flux, improve the q axle inductances of motor, increase the reluctance torque of motor, improve the efficiency and power density of motor.

In addition, being first layer with rotor innermost layer permanent magnet 30, have from the end of the interior second layer magnetic slot calculated outwardly There is one section of turnover deflected towards internal layer magnetic slot end direction that can preferably guide stator by the deflection of magnetic slot end Each magnetic conduction channel of the entrance of the magnetic line of force evenly.

Further, the width of magnetic slot end generation return portion gradually increases inwardly from close to rotor outer surface.It is logical It crosses and the width of magnetic slot return portion is arranged to outer narrow inner width, after on the one hand can reducing magnetic slot deflection, magnetic conduction channel f2 Throat width becomes smaller, and caused q axis flux declines, and on the other hand can also preferably guide former from the magnetic for entering magnetic conduction channel f2 The line of force becomes to enter rotor from magnetic conduction channel f3.

As shown in fig. 6, in order to preferably guide the magnetic line of force to be led from high magnetic saturation magnetic conduction channel from low magnetic saturation by switching to Magnet passage passes through, by the midpoint in the second layer magnetic slot end sideline after turnover and second layer magnetic slot end sideline before turnover The distance definition at midpoint is D3, and the non-return portion of second layer magnetic slot is M, 0.6M≤D3 close to the width of Rotor terminal is crossed.It leads Shape before magnet passage end is not transferred is determined by following methods, when installing tablet permanent magnet in magnetic slot, extends magnetic slot Two sidelines, magnetic slot close to rotor outer edge at a distance from rotor outer circle with magnetic slot transfer after it is identical；Work as magnetic slot When interior installation arc-shaped permanent magnet, make the phase tangent line of arc in the endpoint of arc magnetic slot, and extend tangent line, magnetic slot is close to rotor Outer edge it is identical as after turnover at a distance from rotor outer circle.By controlling the amplitude of magnetic slot end deflection, D3 is arranged to More than or equal to 0.6M, the guiding of the magnetic line of force can be made better, obtain the q axle inductances of bigger.

In the present embodiment, the endpoint in the close outside in the second layer magnetic slot end sideline after turnover and before turnover The endpoint of the close inside in two layers of magnetic slot end sideline is compared, closer to the q axis of rotor.Setting in this way is more preferable in order to realize The magnetic line of force guide effect.

Further, second layer magnetic of the second layer magnetic slot end sideline after turnover before the endpoint in outside and turnover Steel tank end sideline is Ga close to the distance of the endpoint of inside, and the distance of Ga is substantially equal to the integral multiple of rotor gas length g. By the way that the distance of Ga to be arranged to the integral multiple of rotor gas length g, there is the harmonic field content that can effectively reduce air gap, Harmonic loss and the torque pulsation of motor are reduced, range is 0.95 times to 1.05 times here.

Further, the length at second layer magnetic slot end-turn position is H-H1, the non-return portion end of magnetic slot Width is M, meets 0.4 × M≤H-H1.Wherein H is that the outer edge of magnetic slot return portion arrives the distance of rotor outer circle, and H1 is forever The width of the magnetic bridge thickness that magnet rotor return portion is formed with rotor outer circle, the non-return portion end of magnetic slot is M.

As shown in figure 4, research finds that the length of magnetic slot return portion has larger shadow to motor q axle inductances and motor magnetic linkage It rings, as 0.4 × M≤H-H1, q axle inductances can be obviously improved, but be more than 2 × M, second layer permanent magnet magnetic flux area can be caused It reduces, causes empty load of motor magnetic linkage to decline, it is therefore preferred that 0.4 × M≤H-H1≤2 × M.

As shown in Figures 5 and 6, for better fixed permanent magnet, the close of second layer magnetic slot end-turn position turns The width Md of sub- inside is less than the width M of the non-return portion end of magnetic slot.The width of second layer magnetic slot return portion end D1 is less than width M, 0.25 × M≤D1≤0.8 × M of the non-return portion end of second layer magnetic slot, it is preferable that 0.3 × M≤D1 ≤0.45×M。

In the present embodiment, the first internal layer magnetic slot section 121 include third roll over slot 124, third roll over slot 124 first end with The outer peripheral end of the close rotor body 10 of first internal layer magnetic slot section 121 is connected, and third rolls over the second end court of slot 124 Extend to the outer edge of rotor body 10 and is gradually distance from d-axis.Third internal layer magnetic slot section 123 includes four fold slot 125, the The first end of four fold slot 125 is connected with the outer peripheral end of the close rotor body 10 of third internal layer magnetic slot section 123, the The outer edge of the second end of four fold slot 125 towards rotor body 10 extends and is gradually distance from d-axis.Magnetic slot is set and rolls over slot part Angle, can significantly more efficient guiding stator body 40 q axis magnetic linkages line each magnetic conduction channel of entrance evenly, increase motor Q axle inductances, promote the reluctance torque of motor.

The study found that the width D 1 of magnetic slot return portion end has certain influence for the cross, straight axle inductance of motor, As shown in fig. 6, when width D 1 is more than 0.8 × M, magnetic slot end is more to q axis flux blocking, and q axle inductances can be caused to decline, If width D 1 is less than 0.25 × M, the magnetic line of force of axle inductance be easy between rotor magnetic steel slot and rotor outer circle every magnetic Bridge passes through, and in order to obtain larger cross, straight axle inductance difference, promotes the reluctance torque of motor, 0.25 × M≤D1≤0.8 × M, Further more preferably, 0.3 × M≤D1≤0.45 × M.In addition, permanent magnet is not placed in the part that magnetic slot end is transferred, it can Effectively to slow down the local demagnetization of tail end permanent magnet body, the anti-demagnetization capability of motor is promoted.

Further, the number of plies of rotor permanent magnet is 2 layers or 3 layers.By by the number of plies of rotor permanent magnet be 2 layers or 3 layers, the reluctance torque of motor can be not only promoted, but also can be excessive to avoid Permanent-magnet layer number, the single layer Operating Point of Permanent Magnet brought Decline, improves the efficiency of motor and anti-demagnetization capability.

Wherein, rotor permanent magnet is ferrite permanent magnet, makees circular arc by the center of circle of rotor center, circular arc passes through from most The central point P of 20 outer edge of outer layer permanent magnet, the summation and the ratio of the circular arc circumference of circular arc rotor permanent magnet body thickness are 45%-70%.When rotor permanent magnet is ferrite, by being arranged the thickness of permanent magnet within the scope of this so that Permanent magnetism body thickness is in than the ratio of magnetic conduction channel thickness than preferably range, can both ensure that Operating Point of Permanent Magnet is higher, obtained Larger anti-demagnetization capability and higher empty load of motor magnetic linkage are obtained, and it is poor so that motor obtains larger cross, straight axle inductance Value, promotes the reluctance torque of motor.Preferably, the summation of circular arc rotor permanent magnet body thickness and the ratio of the circular arc circumference are 55%-65%.

In the present embodiment, in order to enhance the mechanical strength of rotor, have one or more every magnetic among each layer magnetic slot Bridge.Also, rotor inner layer magnetic slot is placing tablet permanent magnet close to the both ends of rotor outer circle.Second layer magnetic slot is close to rotor Place tablet permanent magnet in the end of outer circle.By placing tablet permanent magnet in magnetic slot end, can be put in identical rotor More permanent magnets are set, the efficiency of motor and anti-demagnetization capability are promoted.

Further, the rotor permanent magnet number of plies is two layers, outer layer magnetic slot substantially journey V-type, side permanent magnetism in V-type magnetic slot The length of body is L, and the maximum width of V-type arrangement permanent magnet is C, meets 0.8 × C≤L.Outer layer magnetic slot substantially journey is U-shaped, at least By three sections of set of permanent magnets at the surface area fraction of outer layer permanent magnet 20 and internal layer permanent magnet 30 on the outside of rotor is S1/S2, outside The outer point of layer permanent magnet 20 and internal layer permanent magnet 30 close to rotor outer surface end is distinguished with the angle that rotor center is formed For 2 × α 1,2 × α 2, meet relationship：1.3×(sinα1/sinα2)≤S1/S2≤2×(sinα1/sinα2).

By by the setting of the arrangement shape of outer layer permanent magnet 20 and inside and outside 20 area ratio of layer permanent magnet, Ke Yigeng The operating point of good adjustment permanent magnet so that the average operation motor higher of inside and outside layer permanent magnetism, the magnetic line of force in internal layer permanent magnet 30 It is more reasonable into outer layer permanent magnet 20 and the ratio for being directly entered stator body 40, the permanent magnet flux linkage of motor is increased, is carried The efficiency and power factor of motor are risen.By the way that inside and outside layer permanent magnet surfaces product ratio is arranged to 1.3 × (sin α 1/sin α 2)≤S1/S2≤2 × (sin α 1/sin α 2), can obtain larger empty load of motor magnetic linkage.Preferably, 1.5 × (sin α 1/sin α2)≤S1/S2≤1.8×(sinα1/sinα2)。

In the present embodiment, rotor innermost layer both sides tablet permanent magnetism body thickness M2 is more than second layer end plate permanent magnet Thickness M1,1.1M1≤M2≤1.8M1, the study found that when stator body 40 applies direction magnetic field, the work of inside and outside layer permanent magnet Make point and differ, the operating point of internal layer permanent magnet 30 will be less than outer layer permanent magnet 20 so that internal layer permanent magnet 30 is easier out Existing local demagnetization, influences motor integrally anti-demagnetization capability, in order to alleviate this phenomenon, 30 thickness M2 of internal layer permanent magnet is arranged to More than outer layer permanent magnet M1, in order to enable the inside and outside anti-demagnetization capability of layer permanent magnet is consistent, 1.1 × M1≤M2≤1.8 × M1.It is excellent Selection of land, 1.1 × M1≤M2≤1.3 × M1.

Wherein, inside and outside layer rectangular permanent magnet formation magnetic conduction channel width is unequal, and magnetic conduction channel width is close to rotor appearance Face width is smaller.It is designed by gradually smaller magnetic conduction channel width, can preferably adjust the magnetic flux face of inside and outside layer permanent magnet Product realizes that the consistency of inside and outside layer Operating Point of Permanent Magnet is adjusted.

In the present embodiment, the angle of outer layer magnetic slot return portion outer edge is A1, the non-return portion of outer layer magnetic slot The angle of outer edge is A, and 2 × A≤A1, internal layer magnetic slot distal outer surface is with trimming, internal layer magnetic slot trim portion outside The angle of line is B1, and the angle of magnetic slot untouched edge part outer edge is B, 2 × B≤B1, and 1.1 × B1≤A1.By setting The angle of the angle and non-return portion of the non-return portion outer edge of magnetic slot is set, it can significantly more efficient guiding stator q axis magnetic Each magnetic conduction channel of the entrance of chain line evenly, increases the q axle inductances of motor, promotes the reluctance torque of motor.Rotor inner layer magnet steel The outer surface end of slot has trimming, and the width of magnetic slot end is D1, the width of the non-chamfered portion end of magnetic slot after beveling For D2, D1≤0.6 × D2.The width that internal layer magnetic slot end is reduced by trimming can be effectively increased stator magnetic flux entrance and turn Son improves the q axle inductances of motor.Internal layer magnetic slot end has one section of turnover towards magnetic pole line of demarcation to deflection, Ke Yigeng Good distribution reduces the part saturation in magnetic conduction channel, promotes electricity into the magnetic line of force quantity of magnetic conduction channel f2 and magnetic conduction channel f3 The reluctance torque of machine.All magnetic slot ends have one section of turnover towards magnetic pole line of demarcation to deflection, can further adjust each The magnetic line of force in magnetic conduction channel is distributed, and reduces part saturation.All rotor magnetic poles are circumferentially uniformly distributed.

The rotor structure of this programme uses ferrite magnetic Steel material, can effectively reduce rotor structure cost.But due to iron Ferrite rotor structure cost is relatively low, therefore designs and use U+V font structures, increases magnet steel effective area, improves permanent magnetism and turns The reluctance torque that rotor structure is promoted while square, to achieve the effect that promote output torque.Wherein, rotor structure internal layer U Type magnet steel is larger due to radian, it is difficult to process, therefore design and use three-stage, both sides are symmetrical and are in "-" type, centre bit It is in camber to set magnet steel.And the axis magnetic circuit between U-shaped magnet steel and V-type magnet steel is reasonably distributed, and reduces axis magnetic resistance, U-shaped magnet steel The center center of circle and V-type magnet steel sharp corner overlap.And when design axis magnetic circuit, V-structure air groove radius R1 justifies with U-shaped magnet steel Arc R2 concentric designs, and it is designed as R2-R1=H3 (1 ± 10%), rotor structure cost performance can be effectively promoted in this way.

The anti-demagnetization capability of ferrite magnetic steel is poor, therefore, in order to ensure that its anti-demagnetization capability, improves outside V-shape structure Anti- demagnetization capability, 5 ＜ α of the corresponding stator teeth angle comparison of design α of V word angle of releases design, 3 ＜ α 4, while to improve the U-shaped magnetic in inside The anti-demagnetization capability of steel is designed rotor structure magnet steel using different-thickness, arc section magnet steel is thick under above architecture basics It is thicker 10%H1~30%H1 than both sides "-" type magnet steel to spend H1；Further to improve the U-shaped both sides V-shape magnet steel of rotor structure Anti- demagnetization capability carries out corner cut design to both sides "-" type magnet steel.Magnet steel dosage can not only be ensured using above scheme, also It can ensure the axis magnetic circuit of enough width, improve rotor structure reluctance torque, promote rotor structure performance, anti-demagnetization capability obtains Ensure.

Rotor structure includes rotor body, and internal layer magnetic slot and outer layer magnetic slot, internal layer magnet steel are offered on rotor body Magnetic conduction channel, the U-shaped profile knot along rotor body radial direction of internal layer magnetic slot are formed between slot and outer layer magnetic slot Structure is located at the both ends of the first geometric center lines of the radial direction along rotor body of internal layer magnetic slot about the first geometric center Line is symmetrically arranged.Internal layer magnetic slot is U-shaped structure, symmetrical structure centered on outer layer magnetic slot, and ectonexine magnetic slot is nested Together, using the first geometric center lines of the radial direction of same rotor body as symmetrical centre.Setting increases magnet steel in this way The effective area of work improves permanent-magnet torque, and then improves the reluctance torque of rotor structure, to improve rotor structure Output torque.Using the technical solution, the magnetic torque of electric vehicle rotary minor structure can be promoted, the demagnetization of rotor structure is improved Ability, and compared with prior art, reduce 30% cost.

The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, any made by repair Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.

Claims

1. a kind of rotor structure, which is characterized in that including：

Rotor body (10) offers magnetic slot group on the rotor body (10), and the magnetic slot group includes internal layer magnetic slot (12), the internal layer magnetic slot (12) includes the first internal layer magnetic slot section (121) set gradually, the second internal layer magnetic slot section (122) and third internal layer magnetic slot section (123), the arc-shaped structure of the second internal layer magnetic slot section (122), second internal layer Shaft hole (13) side of the curved portion of magnetic slot section (122) towards the rotor body (10) is projectedly arranged, and described second Internal layer magnetic slot section (122) is symmetrically arranged about the d-axis of the rotor body (10), the second internal layer magnetic slot section (122) extended line of the end sidewalls at both ends intersects at point Q with the d-axis.

2. rotor structure according to claim 1, which is characterized in that the magnetic slot group includes outer layer magnetic slot (11), The outer layer magnetic slot (11) is disposed adjacently with the internal layer magnetic slot (12), the outer layer magnetic slot (11) and the internal layer Magnetic conduction channel is formed between magnetic slot (12), the outer layer magnetic slot (11) is located on the outside of the internal layer magnetic slot (12).

3. rotor structure according to claim 2, which is characterized in that the outer layer magnetic slot (11) includes multiple magnetic slots Section, multiple magnetic slot sections include：

First outer layer magnetic slot section (111), the first end of the first outer layer magnetic slot section (111) is towards the shaft hole (13) It is extended, the outer edge extension of second end towards the rotor body (10) of the first outer layer magnetic slot section (111) is set It sets, the first outer layer magnetic slot section (111) is located at the first side of the d-axis；

Second outer layer magnetic slot section (112), the second outer layer magnetic slot section (112) and the first outer layer magnetic slot section (111) it is oppositely disposed and is located at the second side opposite with the first side of the d-axis, the second outer layer magnetic slot section (112) First end be extended towards the shaft hole (13), the second end of the second outer layer magnetic slot section (112) is described in The outer edge of rotor body (10) is extended.

4. rotor structure according to claim 3, which is characterized in that the outer layer magnetic slot (11) further includes：

First folding slot (113), the first end of the first folding slot (113) and the second of the first outer layer magnetic slot section (111) End is connected, and the outer edge of second end towards the rotor body (10) of the first folding slot (113) extends and is gradually distance from The d-axis.

5. rotor structure according to claim 3, which is characterized in that the outer layer magnetic slot (11) further includes：

Second folding slot (114), the first end of the second folding slot (114) and the second of the second outer layer magnetic slot section (112) End is connected, and the outer edge of second end towards the rotor body (10) of the second folding slot (114) extends and is gradually distance from The d-axis.

6. rotor structure according to claim 3, which is characterized in that multiple magnetic slot sections further include：

Third outer layer magnetic slot section (115), first end and the first outer layer magnet steel of the third outer layer magnetic slot section (115) The first end of slot section (111) is connected, second end and the second outer layer magnetic slot of the third outer layer magnetic slot section (115) The first end of section (112) is connected.

7. rotor structure according to claim 6, which is characterized in that the first outer layer magnetic slot section (111), described Two outer layer magnetic slot sections (112) and the third outer layer magnetic slot section (115) form v-shaped structure magnetic slot, alternatively, described first Outer layer magnetic slot section (111), the second outer layer magnetic slot section (112) and the third outer layer magnetic slot section (115) form U-shaped Structure magnetic slot.

8. rotor structure according to claim 4, which is characterized in that the second end of the first folding slot (113) it is close The geometric center lines at the midpoint of the side wall at the outer edge of the rotor body (10) and the first outer layer magnetic slot section (111) Distance be D3, the width of the end of the second end of the first outer layer magnetic slot section (111) is M, wherein 0.6M≤D3.

9. rotor structure according to claim 8, which is characterized in that the second end of the first folding slot (113) with it is described The first magnetic bridge is formed between the outer edge of rotor body (10), wherein 0.4 × M≤(H-H1), alternatively, 0.4 × M≤(H- H1)≤2 × M, M are the width of the end of the second end of the first outer layer magnetic slot section (111), and H is the first outer layer magnetic For the second end of steel tank section (111) to the distance of the outer edge of the rotor body (10), H1 is the width of first magnetic bridge.

10. rotor structure according to claim 2, which is characterized in that the first internal layer magnetic slot section (121), described Second internal layer magnetic slot section (122) and the third internal layer magnetic slot section (123) are positioned apart from successively, the first internal layer magnetic The second magnetic bridge (52), the second internal layer magnetic are formed between steel tank section (121) and the second internal layer magnetic slot section (122) It is formed with third magnetic bridge (53) between steel tank section (122) and the third internal layer magnetic slot section (123).

11. rotor structure according to claim 10, which is characterized in that the rotor structure further includes：

Arc-shaped permanent magnet (31), the arc-shaped permanent magnet (31) are set in the second internal layer magnetic slot section (122), the arc The magnetic direction of shape permanent magnet (31) meets at point Q with the d-axis.

12. rotor structure according to claim 11, which is characterized in that the both ends of the arc-shaped permanent magnet (31) with it is described The distance between second magnetic bridge (52) is L1, wherein L1≤0.2mm.

13. rotor structure according to claim 11, which is characterized in that the rotor structure further includes：

First internal layer permanent magnet (32), the first internal layer permanent magnet (32) are set to the first internal layer magnetic slot section (121) It is interior, the surface of close second magnetic bridge (52) side of the first internal layer permanent magnet (32) and second magnetic bridge (52) sideline is set in parallel.

14. rotor structure according to claim 13, which is characterized in that the close institute of the first internal layer permanent magnet (32) It is L1 to state the distance between the surface of the second magnetic bridge (52) side and described second magnetic bridge (52), wherein L1≤0.2mm.

15. rotor structure according to claim 13, which is characterized in that the rotor structure further includes：

Third internal layer permanent magnet (33), the third internal layer permanent magnet (33) are set to the third internal layer magnetic slot section (123) It is interior, the surface of close third magnetic bridge (53) side of the third internal layer permanent magnet (33) and the third magnetic bridge (53) sideline is set in parallel.

16. rotor structure according to claim 15, which is characterized in that the close institute of the third internal layer permanent magnet (33) It is L3 to state the distance between the surface of third magnetic bridge (53) side and described third magnetic bridge (53), wherein L3≤0.2mm.

17. rotor structure according to claim 10, which is characterized in that second magnetic bridge (52) and/or described The width of three magnetic bridges (53) is gradually reduced outward along the radial direction of the rotor body (10).

18. rotor structure according to claim 15, which is characterized in that the rotor structure further includes the first internal layer permanent magnetism Body (32), the first internal layer permanent magnet (32) are set in the first internal layer magnetic slot section (121), and first internal layer is forever Magnet (32) and the third internal layer permanent magnet (33) are rectangular permanent magnet.

19. rotor structure according to claim 10, which is characterized in that the rotor structure further includes：

Arc-shaped permanent magnet (31), the arc-shaped permanent magnet (31) are set in the second internal layer magnetic slot section (122), the arc The magnetic direction of shape permanent magnet (31) comes together in the inner arc center of circle and the arc-shaped permanent magnet (31) of the arc-shaped permanent magnet (31) The outer arc center of circle between line on.

20. rotor structure according to claim 2, which is characterized in that the internal layer magnetic slot (12) along the rotor The U-shaped profile structure of ontology (10) radial direction, the both ends of the internal layer magnetic slot (12) are about internal layer magnetic slot (12) The first geometric center lines of the radial direction along the rotor body (10) be symmetrically arranged.

21. rotor structure according to claim 20, which is characterized in that the institute of the second internal layer magnetic slot section (122) State the second geometry of the first geometric center lines and the radial direction along the rotor body (10) of the outer layer magnetic slot (11) Centerline collineation.

22. rotor structure according to claim 21, which is characterized in that the outer layer magnetic slot (11) along the rotor The V-shaped structure in cross section of the radial direction of ontology (10), the direction described second of the first end of the outer layer magnetic slot (11) Direction second geometric center lines of the extended line of the side wall of geometric center lines and the second end of the outer layer magnetic slot (11) The extended line of side wall intersect to form the first angle α 1, wherein (13/15) × α ＜ α 1≤(17/15) × α, α is positioned at institute State the polar arc angle in the outside magnetic conduction channel of internal layer magnetic slot (12).

23. rotor structure according to claim 2, which is characterized in that the direction of the first internal layer magnetic slot section (121) The direction outer layer magnet steel of the extended line of the side wall of the outer layer magnetic slot (11) and the third internal layer magnetic slot section (123) The extended line of the side wall of slot (11) intersects to form the first angle α 2, wherein 0≤α 2- α 1≤(1/15) × α.

24. rotor structure according to claim 4, which is characterized in that the first internal layer magnetic slot section (121) and described The junction of third internal layer magnetic slot section (123) and towards the arc-shaped structure of side wall of the internal layer magnetic slot (12), the arc The center of circle of shape structure is identical as the center of circle of the second internal layer magnetic slot section (122).

25. rotor structure according to claim 15, which is characterized in that the rotor structure further includes：

Internal layer permanent magnet (30), the internal layer permanent magnet (30) are set in the internal layer magnetic slot (12)；

Outer layer permanent magnet (20), the outer layer permanent magnet (20) are set in the outer layer magnetic slot (11), the internal layer permanent magnetism The thickness of body (30) is H2, and the thickness of the outer layer permanent magnet (20) is H, wherein 0.2 × H≤H2-H≤0.3 × H.

26. rotor structure according to claim 15, which is characterized in that the thickness of the arc-shaped permanent magnet (31) is H1, The thickness of the first internal layer permanent magnet (32) or the third internal layer permanent magnet (33) is H21, wherein H1-H21=t, In, t ∈ [0.1 × H1,0.3 × H1].

27. rotor structure according to claim 25, which is characterized in that the first internal layer permanent magnet (32) and/or institute The end set at the outer edge of the rotor body (10) for stating third internal layer permanent magnet (33) has trimming.

28. rotor structure according to claim 27, which is characterized in that the rotor structure further includes：

Stator body (40) is provided with multiple stator tooths, multiple stator tooth packets on the inner peripheral surface of the stator body (40) Include the first stator tooth (41) and the second stator tooth (42), first stator tooth (41) and the second stator tooth (42) compartment of terrain Setting, the end of the first internal layer permanent magnet (32) are oppositely disposed with first stator tooth (41), the third internal layer The end of permanent magnet (33) is oppositely disposed with second stator tooth (42), the separate institute of the first internal layer permanent magnet (32) The end set for stating outer layer permanent magnet (20) has the first trimming (321), the third internal layer permanent magnet (33) far from described outer The end set of layer permanent magnet (20) has the second trimming (331).

29. rotor structure according to claim 28, which is characterized in that multiple stator tooths further include third stator tooth (43) it is disposed adjacently with first stator tooth (41) with the 4th stator tooth (44), the third stator tooth (43), described The distance of three stator tooths (43) to the first geometric center lines is more than first stator tooth (41) to first geometric center lines Distance, the 4th stator tooth (44) is disposed adjacently with second stator tooth (42), and the 4th stator tooth (44) is extremely The distance of first geometric center lines is more than second stator tooth (42) to the distance of first geometric center lines；

Wherein, the distance between first trimming (321) and second trimming (331) are L1, first stator tooth (41) surface far from first geometric center lines of end is with the end of second stator tooth (42) far from described The distance between surface of first geometric center lines is L2, close first geometry of the end of the third stator tooth (43) The surface of center line and the end of the 4th stator tooth (44) between the surface of first geometric center lines away from From for L3, L2 ＜ L1 ＜ L3.

30. rotor structure according to claim 25, which is characterized in that the outer layer permanent magnet (20) includes：

First outer layer permanent magnet (21), the first outer layer permanent magnet (21) is set in the outer layer magnetic slot (11), described The first end of first outer layer permanent magnet (21) is extended towards at the shaft hole (13), the first outer layer permanent magnet (21) Second end towards the rotor body (10) outer edge be extended；

Second outer layer permanent magnet (22), the second outer layer permanent magnet (22) is set in the outer layer magnetic slot (11), described The first end of second outer layer permanent magnet (22) is extended towards at the shaft hole (13), the second outer layer permanent magnet (22) Second end towards the rotor body (10) outer edge be extended, the first outer layer permanent magnet (21) and described second Outer layer permanent magnet (22) is symmetrically arranged about the second geometric center lines.

31. rotor structure according to claim 30, which is characterized in that the rotor structure further includes：

Stator body (40) is provided with multiple stator tooths on the inner peripheral surface of the stator body (40), and multiple stator tooths are also Including the 5th stator tooth (45), the 5th stator tooth (45) is located at the first outer layer permanent magnet (21) and second outer layer Between permanent magnet (22), multiple stator tooths further include the 6th stator tooth (46) and the 7th stator tooth (47), and the described 6th is fixed Sub- tooth (46) is disposed adjacently with the 5th stator tooth (45), the end and the described 5th of the first outer layer permanent magnet (21) Stator tooth (45) is oppositely disposed, and the 6th stator tooth (46) is disposed adjacently with the 5th stator tooth (45), and described The end of two outer layer permanent magnets (22) is oppositely disposed with the 6th stator tooth (46).

32. rotor structure according to claim 31, which is characterized in that the outer layer magnetic slot (11) far from described The company of point and the shaft hole (13) on layer magnetic slot (12) and side wall apart from the farthest of second geometric center lines The central angle that line is formed is α 3, close 5th stator tooth of the 6th stator tooth (46) and the 7th stator tooth (47) (45) central angle that side wall and the line in the center of circle of the rotor body (10) are formed is α 4, the 5th stator tooth (45) The central angle that the line of the both ends of the line of maximum width and the shaft hole (13) is formed is α 5, wherein 5 ＜ α of α, 3 ＜ α 4.

33. a kind of permanent magnetism assist in synchronization reluctance motor, including rotor structure, which is characterized in that the rotor structure is wanted for right Seek the rotor structure described in any one of 1 to 32.

34. a kind of electric vehicle, including rotor structure, which is characterized in that the rotor structure is any in claims 1 to 32 Rotor structure described in.