CN109639001B - A rotor for a synchronous reluctance motor - Google Patents
A rotor for a synchronous reluctance motor Download PDFInfo
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- CN109639001B CN109639001B CN201811628249.1A CN201811628249A CN109639001B CN 109639001 B CN109639001 B CN 109639001B CN 201811628249 A CN201811628249 A CN 201811628249A CN 109639001 B CN109639001 B CN 109639001B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/27—Rotor cores with permanent magnets
- H02K1/2706—Inner rotors
- H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
- H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K2213/00—Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
- H02K2213/03—Machines characterised by numerical values, ranges, mathematical expressions or similar information
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- Permanent Field Magnets Of Synchronous Machinery (AREA)
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Abstract
本发明涉及一种用于同步磁阻电机的转子结构，转子的圆周方向上分布有多组空气层结构，转子的中部设有一圈减重孔，每一个空气层结构包括第一、第二两层空气槽组；第一空气槽组包括设在中部的第一直轴空气槽，第一直轴空气槽两侧分别设有一第一交轴空气槽；第二空气槽组包括设在中部的两根第二直轴空气槽，每根第二直轴空气槽外侧分别设有一第二交轴空气槽。通过结构优化处理，空气槽的设置，加强筋的摆设以及磁钢的放置，从而有效提高电机的峰值扭矩、效率和功率因素，降低高速弱磁区反电势，并显著提高电机调速范围。
The present invention relates to a rotor structure for a synchronous reluctance motor, wherein multiple groups of air layer structures are distributed in the circumferential direction of the rotor, a circle of weight-reducing holes is arranged in the middle of the rotor, and each air layer structure includes a first and a second air slot group; the first air slot group includes a first direct-axis air slot arranged in the middle, and a first cross-axis air slot is arranged on both sides of the first direct-axis air slot; the second air slot group includes two second direct-axis air slots arranged in the middle, and a second cross-axis air slot is arranged on the outer side of each second direct-axis air slot. Through structural optimization, the setting of air slots, the arrangement of reinforcing ribs and the placement of magnetic steel, the peak torque, efficiency and power factor of the motor are effectively improved, the back electromotive force in the high-speed weak magnetic field area is reduced, and the speed regulation range of the motor is significantly improved.
Description
Technical Field
The invention relates to the technical field of synchronous reluctance motors, in particular to a rotor structure for a synchronous reluctance motor, and especially relates to a rotor structure with a double-layer air layer.
Background
With the development of power electronic technology and control theory, the permanent magnet synchronous reluctance motor (Synchronous Reluctance Machine) is short for SynRM, which has the advantages of simple structure, easy manufacture, low cost, reliable operation and the like, and is widely applied to the fields of industrial and agricultural production, transportation, national defense, commercial and household appliances, medical appliances and the like.
At present, the rotor structure of the permanent magnet synchronous reluctance motor is mainly built-in, and has certain reluctance performance, so that the permanent magnet synchronous reluctance motor becomes a rotor structure mainly adopted by a new energy automobile driving motor. However, as the price of the permanent magnet material increases, the production cost increases, and the requirement of a high-performance driving motor, the problems of low material utilization rate, narrow weak magnetic range and the like of the motor with the built-in permanent magnet structure are solved, so that the utilization rate of the conventional built-in rotor structure is limited. In particular, in the low-speed and high-torque region, the conventional permanent magnet motor has a high-temperature demagnetization risk.
Therefore, in the prior art, there is an urgent need for an optimized rotor structure, which improves the performance of the driving motor and the speed regulation range of the motor.
Disclosure of Invention
The invention aims to provide an improved rotor structure for a synchronous reluctance motor, which is provided with a double-layer air layer structure, and the angle of an air groove is adjusted and corresponding permanent magnets are matched, so that the peak torque, efficiency and power factor of the motor are effectively improved, and the speed regulation range of the motor is improved.
In order to achieve the above object, the technical scheme of the present invention is as follows: a rotor structure for a synchronous reluctance motor, characterized by: a plurality of groups of air layer structures are distributed in the circumferential direction of the rotor, a circle of lightening holes are formed in the middle of the rotor, each air layer structure comprises a first air groove group and a second air groove group, the first air groove group is arranged along the outer circumference of the rotor, and the second air groove group is arranged on the periphery of the first air groove group and corresponds to the first air groove group; the first air groove group comprises first straight-axis air grooves arranged in the middle, two sides of each first straight-axis air groove are respectively provided with a first intersecting-axis air groove, and the two first intersecting-axis air grooves are symmetrically distributed along the perpendicular bisectors of the first straight-axis air grooves; the second air groove group comprises second straight-axis air grooves arranged in the middle, two second straight-axis air grooves are provided, and one side of each second straight-axis air groove is provided with a second intersecting-axis air groove respectively.
Preferably, one end part of the two first quadrature axis air grooves is provided with a round chamfer, and the other end part is provided with a chamfer angle which corresponds to the first direct axis air grooves; a first air reinforcing rib is arranged between the first straight-axis air groove and one first quadrature-axis air groove; an included angle exists between the first straight axis air groove and the first intersecting axis air groove.
Further, one end parts of the two second quadrature axis air grooves are provided with round chamfers, and the other end parts are provided with chamfer angles which correspond to the second direct axis air grooves; the two second straight-axis air grooves are arranged in parallel and are connected through a second air reinforcing rib; a side air reinforcing rib is arranged between the second straight axis air groove and the second intersecting axis air groove; an included angle exists between the second straight axis air groove and the second intersecting axis air groove.
Further, the height of the first straight-axis air groove is the same as that of the second straight-axis air groove, a first layer of permanent magnet is inserted in the first straight-axis air groove, a second layer of permanent magnet is arranged in the second straight-axis air groove, the height and the width of the first straight-axis air groove are both larger than those of the first layer of permanent magnet, and the height and the width of the second straight-axis air groove are both larger than those of the second layer of permanent magnet; the first layer of permanent magnet is inserted into the first straight-axis air groove, matched with the first straight-axis air groove and the first intersecting-axis air groove and used for providing a permanent magnet magnetic field excitation source; the second layer of permanent magnets are respectively inserted into the two second straight-axis air grooves, matched with the second straight-axis air grooves and the second intersecting-axis air grooves and used for providing an auxiliary permanent magnet magnetic field excitation source and sharing a reverse straight-axis direction magnetic field when the high-speed region is in weak magnetic.
Further, the height and width of the first straight-axis air groove are respectively 0.01mm larger than the height and width of the first layer of permanent magnets, and the height and width of the second straight-axis air groove are respectively 0.01mm larger than the height and width of the second layer of permanent magnets.
Further, the included angle θ 1 is obtained by a formula θ1=90° +360°/p+Δθ, where p is the pole pair number of the motor, and the correction value is Δθ (Δθ is the difference and the ratio of the inductance of the adjustment alternating axis and the direct axis, and the difference between the salient pole ratio and the inductance of the adjustment alternating axis and the direct axis is optimized within a range of-5 ° to obtain an optimal value, so that the motor under the angle change has the maximum difference between the salient pole ratio and the inductance of the alternating axis.
Furthermore, the weight-reducing hole is formed by combining a plurality of balance weight single holes in arc sections into a concentric ring structure, the number of the balance weight single holes is p, p is the pole pair number of the motor, and each balance weight single hole is provided with four round chamfers.
Compared with the prior art, the technical scheme of the invention comprises a plurality of improvements in detail besides the improvement of the whole technical scheme, and particularly has the following beneficial effects:
1. According to the improved scheme, a plurality of groups of air layer structures are distributed in the circumferential direction of the rotor, each air layer structure comprises a first layer of air groove groups and a second layer of air groove groups which are correspondingly arranged, a layer of lightening holes are further formed in the rotor, and through arrangement of the air grooves, reinforcement ribs are arranged and magnetic steel is arranged, so that peak torque, efficiency and power factors of a motor are effectively improved, counter potential of a high-speed weak magnetic area is reduced, and the speed regulation range of the motor is remarkably improved;
2. According to the technical scheme, the first air groove group comprises a first straight-shaft air groove arranged in the middle, two sides of the first straight-shaft air groove are respectively provided with a first intersecting-shaft air groove, an included angle exists between the first straight-shaft air groove and the first intersecting-shaft air groove, meanwhile, a first air reinforcing rib is arranged between the first straight-shaft air groove and one of the first intersecting-shaft air grooves, and the first straight-shaft air groove is provided with a permanent magnet, so that the effect of providing a permanent magnet magnetic field excitation source is achieved, the magnetic flux of each pole of a rotor is effectively increased, and therefore the air gap magnetic density and the power density of a motor are effectively improved;
3. According to the technical scheme, the second air groove group comprises a second straight-axis air groove arranged in the middle and a second intersecting-axis air groove matched with the second straight-axis air groove, the two second straight-axis air grooves are arranged in parallel and are connected through second air reinforcing ribs, side air reinforcing ribs are arranged between the second straight-axis air groove and the second intersecting-axis air groove, an included angle exists between the second straight-axis air groove and the second intersecting-axis air groove, a second permanent magnet is arranged in the second straight-axis air groove, the permanent magnet plays an auxiliary excitation role, and when the permanent magnet is in flux weakening in a high-speed area, a magnetic field in the direction of the straight-axis is reversed, and permanent demagnetization of the permanent magnet is prevented;
4. According to the invention, the height and the width of the first straight-axis air groove are respectively 0.01mm larger than those of the first layer of permanent magnets, the height and the width of the second straight-axis air groove are respectively 0.01mm larger than those of the second layer of permanent magnets, the included angle theta 1 is obtained through the formula theta 1 =90 degrees+360 degrees/p+delta theta, and through the optimized structure, the air-in magnetic compact waveform approximates to a sine wave, so that the quadrature-axis inductance is larger than that of the straight-axis inductance, and the magnetic resistance characteristic of the motor is provided.
5. The rotor with the special structure has the advantages of simple structure, convenient control and further increased power density. The torque of the motor can be further improved and the working stability of the motor can be increased when the motor is used on an electric automobile driving motor.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Fig. 2 is an enlarged schematic view of the portion a in fig. 1.
Fig. 3 is a schematic view of the structure of the present invention with permanent magnets removed.
Fig. 4 is an enlarged schematic view of the portion B in fig. 3.
FIG. 5 shows a straight shaft according to the present invention magnetic force line distribution diagram.
FIG. 6 is a cross-axis of the present invention magnetic force line distribution diagram.
Fig. 7 is an equivalent magnetic flux distribution diagram under one magnetic pole of the present invention.
Reference numerals:
1 an air layer structure, 2a first layer air groove group, 3a second layer air groove group and 4 weight reducing holes;
21 first straight-axis air grooves, 22 first quadrature-axis air grooves, 23 first-layer permanent magnets and 24 first air reinforcing ribs;
31 second straight axis air grooves, 32 second quadrature axis air grooves, 33 second air reinforcing ribs, 34 side air reinforcing ribs and 35 second layer permanent magnets;
41 weight single hole.
Detailed Description
The following description of the embodiments of the present invention will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
First, some abbreviations or terms related to the present invention are defined:
reluctance motor: the structure and the working principle of the electric transmission device are greatly different from those of the traditional AC/DC motor. It does not rely on the interaction of magnetic fields generated by stator and rotor winding currents to generate torque, but rather relies on the "principle of minimum reluctance" to generate torque.
And (3) intersecting the straight axis: the quadrature axis is also called q axis, the direct axis is also called d axis, and the axes are actually coordinate axes, instead of the actual axes, a coordinate system is established on the motor rotor, the coordinate system rotates synchronously with the rotor, the direction of the rotor magnetic field is taken as d axis, the direction perpendicular to the rotor magnetic field is taken as q axis, and the mathematical model of the motor is converted into the coordinate system, so that decoupling of the d axis and the q axis can be realized, and good control characteristics are obtained.
The present invention provides a rotor structure for a synchronous reluctance motor, see in particular fig. 1, which differs from the prior art in that: a plurality of groups of air layer structures are distributed in the circumferential direction of the rotor, a circle of lightening holes are formed in the middle of the rotor, each air layer structure comprises a first air groove group and a second air groove group, the first air groove group is arranged along the outer circumference of the rotor, and the second air groove group is arranged on the periphery of the first air groove group and corresponds to the first air groove group; the first air groove group comprises first straight-axis air grooves arranged in the middle, two sides of each first straight-axis air groove are respectively provided with a first intersecting-axis air groove, the two first intersecting-axis air grooves are symmetrically distributed along the perpendicular bisectors of the first straight-axis air grooves, and blocking parts are arranged between the first straight-axis air grooves and the two first intersecting-axis air grooves, so that the air magnetic dense wave is further perfected;
Further, the second air tank group is including setting up the second straight axle air tank at the middle part, and second straight axle air tank is two altogether, and every second straight axle air tank one side is equipped with a second quadrature axis air tank respectively, and all be equipped with the separation between here two second straight axle air tanks, between second straight axle air tank and the second quadrature axis air tank, further perfect the air-in-magnetic dense wave, make it approximate sine wave, weaken the main harmonic that influences rotor performance.
Specifically, because a plurality of groups of air layer structures are distributed in the circumferential direction of the rotor, each air layer structure comprises a first layer of air groove groups and a second layer of air groove groups which are correspondingly arranged, a layer of lightening holes are further formed in the rotor, and through arrangement of the air grooves, reinforcement ribs are arranged and magnetic steel is arranged, so that peak torque, efficiency and power factors of the motor are effectively improved, counter potential of a high-speed weak magnetic area is reduced, and the speed regulation range of the motor is remarkably improved.
In one embodiment, one end (i.e. the end close to the outer edge of the rotor) of the two first quadrature air grooves is provided with a round chamfer, and the distance between the end and the outer edge of the rotor is the width h bridg1e of the first layer of magnetic isolation bridge, while the other end is provided with a chamfer angle which faces the first direct air groove and is arranged in parallel with the end face of the first direct air groove; a first air reinforcing rib is arranged between the first straight shaft air groove and one first quadrature shaft air groove, and because the rotor has higher centrifugal force at high speed for a high-torque motor, the reinforcing rib is arranged at the weak part of the rotor structure, so that the mechanical strength is increased, the width of the reinforcing rib can ensure that the motor can bear 150MPa of stress at the limit rotating speed, and the smaller the reinforcing rib is, the smaller the direct shaft inductance of the motor is, so that the motor has higher magnetic resistance; an included angle theta 1 (theta 1 =900+3600/p+delta theta) exists between the first straight-axis air groove and the first intersecting-axis air groove, p is the pole pair number of the motor, the theta 1 is required to be corrected by considering magnetic field harmonic wave and magnetic resistance characteristics, the correction value is delta theta, and the value range is-3 degrees to 3 degrees.
Specifically, the first layer of permanent magnet is inserted in the first straight air groove to provide a permanent magnet field excitation source, so that the magnetic flux of each pole of the rotor is effectively increased, and the air gap density and the power density of the motor are effectively improved. In the embodiment, the height and the width of the first straight-axis air groove are respectively 0.01mm larger than those of the first layer of permanent magnet, so that the permanent magnet is prevented from sliding, and the magnetic permeability of the air is far lower than that of the magnetic permeable iron core, so that the magnetic resistance in the alternating-direct-axis magnetic circuit is asymmetric, and the motor has higher salient pole ratio (Lq/Ld) and the difference (Lq-Ld) between the alternating-direct-axis inductances.
In another embodiment, one end of the two second quadrature axis air grooves is provided with a round chamfer (i.e. an end close to the outer side edge of the rotor), and the distance between the end and the outer side edge of the rotor is the width h bridge2 of the second-layer magnetic isolation bridge, and the other end is provided with a chamfer angle which faces the second direct axis air groove and is arranged in parallel with the end face of the second direct axis air groove; the two second straight-axis air grooves are arranged in parallel, and a barrier is arranged between the two second straight-axis air grooves and connected through a second air reinforcing rib; a barrier is also arranged between the second straight axis air groove and the second intersecting axis air groove and is connected with each other through a side air reinforcing rib; an included angle exists between the second straight axis air groove and the second quadrature axis air groove, namely, theta 1 (theta 1 =90 degrees+360 degrees/p+delta theta), p is the pole pair number of the motor, and the theta 1 is required to be corrected by considering magnetic field harmonic wave and magnetic resistance characteristics, the correction value is delta theta, and the value range is 4 degrees.
Specifically, the height h1 of the first-layer straight-axis air groove is equal to the height h2 of the second-layer straight-axis air groove, a second air reinforcing rib h rib2 is arranged between the second straight-axis air grooves, and meanwhile, a side air reinforcing rib h rib21、hrib22 is arranged between the second straight-axis air groove and the second intersecting-axis air groove. The height and width of the second straight-axis air groove are larger than the height and width of the second layer permanent magnet, and in this embodiment, the height and width of the second straight-axis air groove are 0.01mm larger than the height and width of the second layer permanent magnet respectively.
The second layer permanent magnets are arranged in the second straight-axis air grooves, the two layers of permanent magnets are respectively inserted into the two second straight-axis air grooves and matched with the second straight-axis air grooves and the second intersecting-axis air grooves to provide auxiliary permanent magnetic field excitation sources and to share the reverse straight-axis direction magnetic field when the high-speed area is in field weakening.
The weight-reducing hole is formed by combining a plurality of balance weight single holes in arc sections to form a concentric ring structure, mating barriers exist between every two adjacent balance weight single holes, and meanwhile, the mating barriers correspond to barriers between two second straight-axis air grooves in a group of air layer structures, perfect air-in magnetic-density sine waves are further provided, the number of the balance weight single holes is p, p is the pole pair number of the motor, and each balance weight single hole is provided with four round chamfers.
In a specific embodiment, the rotor of the invention is applied to a synchronous reluctance motor, and the motor mainly comprises a stator, a rotor and a rotating shaft, wherein an air gap is formed between the stator and the rotor, and the rotor is supported by the rotating shaft. The stator comprises a stator body and a stator winding arranged on the stator body; the motor rotor is internally provided with 2 layers of air groove structures and 1 layer of lightening holes.
The motor stator consists of stator teeth, a stator yoke and stator slots, wherein the stator slots adopt pear-shaped slots, windings are placed in the slots, and the armature windings adopt integer slot distributed windings.
The rotor circumference direction sets up multiunit air structure, every air layer structure of group includes first, second two-layer air groove group, first, second air groove group is 2 boat-shaped sections, every boat shape comprises multistage air groove, have certain angle theta 1 (theta 1 =90+360 DEG/p+delta theta) between the quadrature axis air layer on the quadrature axis on every direct axis direction, p is motor polar logarithm, consider magnetic field harmonic wave, reluctance characteristic needs to revise theta 1, the correction value is delta theta, the quadrature axis air layer tip has sharp angle or chamfer, first direct axis air groove height h1 is equal with second direct axis air groove height h2, there is first strengthening rib h rib1 between first direct axis air groove and the first quadrature axis air groove, be equipped with strengthening rib h rib2 between the second direct axis air groove, there is strengthening rib h rib21、hrib22 between second direct axis air groove and the second quadrature axis air groove simultaneously. Because the air magnetic permeability is far lower than that of the magnetic conductive iron core, the magnetic resistance in the AC-DC magnetic circuit is asymmetric, so that the motor has higher salient pole ratio (Lq/Ld) and the difference (Lq-Ld) between the AC-DC axis inductances.
And each layer of air groove group is provided with a permanent magnet, the first layer of permanent magnet provides a permanent magnet field excitation source, the second layer of permanent magnet plays an auxiliary excitation role, and the permanent magnet is prevented from permanently demagnetizing by reversing the direct axis direction magnetic field when the high-speed area is in weak magnetism.
The main rotor harmonic wave affecting the motor performance has 5/7/11/13 subharmonic wave, wherein the single-layer magnetic steel can only attenuate 5/7 or 11/13 subharmonic wave in the single-layer magnetic steel in a targeted way, and all harmonic waves cannot be attenuated simultaneously. The double-layer magnetic steel can weaken 5/7/11/13 subharmonic affecting the main performance of the motor, and can ensure that the motor has larger output torque and reluctance torque components.
The magnetic density widths generated by the magnetic steel are l 1、l2 respectively, and in order to achieve better weakening of harmonic waves, the magnetic density width l 1、l2 should meet the following relational expression as far as possible. (where l 1、l2 is the corresponding l 1、l2 in FIG. 7)
The relation is satisfied for weakening the 5 th harmonic:
The weakening 7 th harmonic satisfies the relation:
attenuation 11 th harmonic satisfies the relation:
attenuation of the 13 th harmonic satisfies the relationship:
considering the influence of magnetic steel magnetic leakage, iron core saturation and reinforcing ribs, the actual width of each section of magnetic steel needs to be slightly compensated, and the width of the magnetic steel is corrected:
calculating the corrected magnetic steel width:
Wherein h rib2 is the width of the second layer of reinforcing ribs, h bridge1、hbridge2 is the width of the second layer of magnetic isolation bridges of the first layer, and r is the radius of the rotor; as the motor structure changes; h1 is the thickness of the first layer of magnetic steel, h2 is the thickness of the second layer of magnetic steel, deltal 1、Δl2 is the correction width, and the correction width is obtained through accurate calculation of a magnetic field, so that the air gap magnetic density waveform approximates to a sine wave. (-0.05 x l 1＜Δl1＜0.05*l1、-0.05*l2＜Δl2＜0.05*l2)
In summary, the motor structure is optimized, so that the output torque, the power factor and the efficiency of the motor are effectively improved, and the permanent magnet flux density is distributed in a sine way in the air gap, wherein the waveform is more sine because no area with the flux density of 0 exists, and motor harmonics except 11 and 13 harmonics can be effectively weakened. Through analysis, the model can effectively reduce 3 times 5 times harmonic of a motor rotor, has higher waveform sine degree and can effectively reduce the iron core loss of the motor. And secondly, a Q-axis magnetic circuit of the motor structure is mainly concentrated between the first layer of magnetic steel and the second layer of magnetic steel, so that the magnetic density of a rotor yoke is reduced, the thickness of the rotor yoke is reduced, and the reduced rotor yoke adopts a weight-removing hollowing measure, so that the rotational inertia of a rotor can be effectively reduced, the dynamic response performance of the rotor is improved, and the speed regulation range of the motor is improved.
The foregoing is a further detailed description of the invention in connection with the preferred embodiments, and it is not intended that the invention be limited to the specific embodiments described above. It will be apparent to those skilled in the art that several simple deductions or substitutions may be made without departing from the spirit of the invention, and these should be considered to be within the scope of the invention.
Claims (6)
1. A rotor structure for a synchronous reluctance motor, characterized by: a plurality of groups of air layer structures are distributed in the circumferential direction of the rotor, a circle of lightening holes are formed in the middle of the rotor, each air layer structure comprises a first air groove group and a second air groove group, the first air groove group is arranged along the outer circumference of the rotor, and the second air groove group is arranged on the periphery of the first air groove group and corresponds to the first air groove group;
The first air groove group comprises first straight-axis air grooves arranged in the middle, two sides of each first straight-axis air groove are respectively provided with a first intersecting-axis air groove, and the two first intersecting-axis air grooves are symmetrically distributed along the perpendicular bisectors of the first straight-axis air grooves;
the second air groove group comprises second straight-axis air grooves arranged in the middle, two second straight-axis air grooves are provided, and one side of each second straight-axis air groove is provided with a second intersecting-axis air groove respectively;
A barrier is arranged between the first straight-axis air groove and the two first intersecting-axis air grooves, and a first air reinforcing rib is arranged between the first straight-axis air groove and one of the first intersecting-axis air grooves, so that the air-immersed magnetic dense wave is perfect;
an included angle exists between the first straight-axis air groove and the first intersecting-axis air groove;
The two second straight-axis air grooves are arranged in parallel, and a barrier is arranged between the two second straight-axis air grooves and connected through a second air reinforcing rib, so that the air-in magnetic dense wave is close to a sine wave;
An included angle exists between the second straight axis air groove and the second intersecting axis air groove;
The included angle theta 1 is obtained by the formula theta 1 =90 degrees+360 degrees/p+delta theta, wherein p is the pole pair number of the motor, and the correction value is delta theta; for the included angle between the first straight-axis air groove and the first quadrature-axis air groove, the value range of delta theta is-3 degrees to 3 degrees; an included angle exists between the second straight axis air groove and the second quadrature axis air groove, and the value range of delta theta is 4 degrees.
2. A rotor structure for a synchronous reluctance motor according to claim 1, wherein: one end parts of the two first intersecting air grooves are provided with round chamfers, and the other end parts of the two first intersecting air grooves are provided with chamfer angles which correspond to the first straight air grooves.
3. A rotor structure for a synchronous reluctance motor according to claim 1, wherein: one end parts of the two second quadrature axis air grooves are provided with round chamfers, and the other end parts of the two second quadrature axis air grooves are provided with chamfer angles which correspond to the second direct axis air grooves;
And side air reinforcing ribs are arranged between the second straight axis air groove and the second intersecting axis air groove.
4. A rotor structure for a synchronous reluctance motor according to claim 1, wherein: the height of the first straight-axis air groove is the same as that of the second straight-axis air groove, a first layer of permanent magnet is inserted in the first straight-axis air groove, a second layer of permanent magnet is arranged in the second straight-axis air groove, the height and the width of the first straight-axis air groove are both larger than those of the first layer of permanent magnet, and the height and the width of the second straight-axis air groove are both larger than those of the second layer of permanent magnet;
the first layer of permanent magnet is inserted into the first straight-axis air groove, matched with the first straight-axis air groove and the first intersecting-axis air groove and used for providing a permanent magnet magnetic field excitation source;
the second layer of permanent magnets are respectively inserted into the two second straight-axis air grooves, matched with the second straight-axis air grooves and the second intersecting-axis air grooves and used for providing an auxiliary permanent magnet magnetic field excitation source and sharing a reverse straight-axis direction magnetic field when the high-speed region is in weak magnetic.
5. A rotor structure for a synchronous reluctance motor according to claim 4, wherein: the height and the width of the first straight-axis air groove are respectively 0.01mm larger than those of the first layer of permanent magnets, and the height and the width of the second straight-axis air groove are respectively 0.01mm larger than those of the second layer of permanent magnets.
6. A rotor structure for a synchronous reluctance motor according to claim 1, wherein: the weight-reducing hole is formed by combining a plurality of balance weight single holes in arc sections into a concentric ring structure, the number of the balance weight single holes is p, p is the pole pair number of the motor, and each balance weight single hole is provided with four round chamfers.
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| CN110635594A (en) * | 2019-08-26 | 2019-12-31 | 杭州电子科技大学 | A new type of permanent magnet synchronous motor rotor structure for electric vehicles |
| CN110729830A (en) * | 2019-10-29 | 2020-01-24 | 宁波菲仕运动控制技术有限公司 | A high-speed rotor punch and rotor structure |
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