CN105896772B - A kind of rotor core becoming flux permanent magnet synchronous motor - Google Patents
A kind of rotor core becoming flux permanent magnet synchronous motor Download PDFInfo
- Publication number
- CN105896772B CN105896772B CN201610290627.4A CN201610290627A CN105896772B CN 105896772 B CN105896772 B CN 105896772B CN 201610290627 A CN201610290627 A CN 201610290627A CN 105896772 B CN105896772 B CN 105896772B
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- lamination
- rotor core
- magnetic
- type
- magnet steel
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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
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/02—Details of the magnetic circuit characterised by the magnetic material
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Permanent Field Magnets Of Synchronous Machinery (AREA)
- Iron Core Of Rotating Electric Machines (AREA)
Abstract
本发明公开了一种变磁通永磁同步电机的转子铁心，该转子铁心由转子铁心叠片叠加而成，转子铁心叠片包括第一类型叠片和第二类型叠片；第一类型叠片为圆环状结构，其在圆周方向上分布设置有若干未在外沿形成断口的磁钢嵌入缺口，用于形成磁钢体的安装槽，两个磁钢嵌入缺口之间还设置有未在所述第一类型叠片外沿形成断口的第一隔磁口；第二类型叠片与第一类型叠片类似，不同在于在外沿形成缺口。按照本发明实现的转子铁心，通过断开磁钢端部与转子外径之间的磁桥，减小磁钢端部漏磁，以降低充磁电流，并提高转矩密度；并通过断开交轴隔磁槽与转子外径之间的磁桥，以减小交轴电感，使得直轴电感大于交轴电感，从而获得正的磁阻转矩，增大转矩密度。
The invention discloses a rotor core of a variable magnetic flux permanent magnet synchronous motor. The rotor core is formed by stacking rotor core laminations. The rotor core laminations include first type laminations and second type laminations; the first type laminations The sheet is a ring-shaped structure, and it is distributed in the circumferential direction with a number of magnetic steel embedded gaps that are not fractured at the outer edge, used to form the installation groove of the magnetic steel body, and there are also set between the two magnetic steel embedded gaps. The outer edge of the first type of laminations forms a first magnetic isolation opening of the fracture; the second type of laminations are similar to the first type of laminations, except that a gap is formed on the outer edge. According to the rotor core realized by the present invention, by disconnecting the magnetic bridge between the end of the magnetic steel and the outer diameter of the rotor, the magnetic flux leakage at the end of the magnetic steel is reduced, so as to reduce the magnetizing current and increase the torque density; The magnetic bridge between the quadrature-axis magnetic isolation slot and the outer diameter of the rotor can reduce the quadrature-axis inductance, so that the direct-axis inductance is greater than the quadrature-axis inductance, so as to obtain a positive reluctance torque and increase the torque density.
Description
Technical field
The invention belongs to motor fields, more particularly, to a kind of rotor core for becoming flux permanent magnet synchronous motor.
Background technique
New-energy automobile mostly uses internal permanent magnet synchronous motor (IPMSM) with driving motor in recent years, which has
Power density is high, mechanical property is good, the higher advantage of the range of speeds, and extensive concern has been obtained in drive system of electric automobile
And application.However internal permanent magnet synchronous motor d-axis inductance is usually less than axis inductor, is weak using reluctance torque and realization
Magnetic control, current locus are located at the second quadrant, and electric current contains weak magnetic component always, to additionally increase loss and magnet steel utilization
Rate is lower.In addition motor is after entering high speed stage, it is also necessary to weak to motor progress by increasing d-axis demagnetizing current component
Magnetic, to control the limit value that motor terminal voltage is no more than contravarianter voltage, biggish weak magnetoelectricity stream makes the copper loss of motor at this time
Increase, causes the efficiency of motor to reduce, and due to the limitation of inverter power grade, electric current also has a limit value, causes
The weak magnetic degree of motor is restricted, and speed adjustable extent is narrow.
High remanent magnetism, low-coercivity, samarium cobalt permanent magnet body resistant to high temperature and Al-Ni-Co permanent magnet possess the spy for being easy to fill demagnetization
Property, makes it possible the magnetization degree of on-line control permanent magnet.Therefore, a kind of novel change flux permanent magnet synchronous motor structure
It is suggested, such as periodical literature (V.Ostovic, " Memory motors:a new class of controllable flux
PM machines for a true wide speed operation ", IEEE Industry Applications
Conference Record, vol.4, pp.2577-2584 (2001)): by stator direct-axis current impulse vector control, use pole
Narrow pulse current changes the intensity of magnetization of permanent-magnet material online, the fan-out capability of permanent-magnet torque is adjusted according to real-time working condition, i.e.,
It in low rate start, magnetizes completely to magnet steel, expands torque range, magnet steel magnetization degree is reduced when high speed, be not necessarily to or only with few
It measures direct-axis current component and realizes weak magnetic control.Therefore, in the form of this speed regulation for changing the magnet steel intensity of magnetization online by pulse current,
Weak magnetoelectricity stream component can be utmostly reduced, the overall efficiency of motor is improved.
Become the electric current that magnetizes of the maximum that is magnetized completely to magnet steel in magnetic flow permanent magnet motor and directly affects the electric current of frequency converter
Limit value, and the maximum power of frequency converter be current limit value and voltage limit product, therefore maximum magnetize electric current influence
The capacitance grade of frequency converter, therefore reduce the leakage field of magnetic circuit and be necessary with reducing the maximum electric current that magnetizes.In addition, such motor utilizes
The permanent-magnet material of low-coercivity, motor output performance are more lower than common magneto, therefore the torque for the motor that need to take measures to improve
Density.
Summary of the invention
Aiming at the above defects or improvement requirements of the prior art, become magnetic flow permanent magnet the present invention provides a kind of reduction and synchronize electricity
Machine, which magnetizes, electric current and improves the method and the molding preparation method of rotor core of its torque density, and its purpose is to provide a kind of changes
The rotor core of flux permanent magnet synchronous motor, which is characterized in that the rotor core is formed by stacking by rotor core lamination, described
Rotor core lamination includes first kind lamination and Second Type lamination, during superposition forms the rotor core, institute
It states first kind lamination and the Second Type lamination is staggered；
Wherein, the first kind lamination is annular structure, distribution in a circumferential direction be provided with it is several not outside
It is embedded in notch along the magnet steel for forming fracture, the mounting groove of magnet steel is used to form, is also set between described two magnet steel insertion notches
Be equipped with not first kind lamination outer formed fracture first every Ci Kou；
The Second Type lamination be annular structure, in a circumferential direction distribution be provided with it is several formed in outer it is disconnected
The magnet steel of mouth is embedded in notch, is used to form the mounting groove of magnet steel, is additionally provided between described two magnet steel insertion notches in institute
State first kind lamination outer formed fracture first every Ci Kou.
Further, on the first kind lamination and the Second Type lamination, also have described in being symmetrically distributed in
Magnet steel is embedded in the second quadrature axis magnetic circuit along d-axis magnetic linkage direction of notch (2) two sides every Ci Kou.
Further, the second quadrature axis magnetic circuit is multiple in the parallel arrangement in the radial direction setting every magnetic mouth.
Further, during the first kind lamination and the Second Type lamination are staggered, the first kind is folded
The first part that the multiple superpositions of piece are formed is staggered with the multiple second parts formed that are superimposed of the Second Type lamination, described
Second Type number of laminations further more than the first kind number of laminations, the Second Type number of laminations and described the
The ratio of one type number of laminations is 4:1.
Further, make the through-hole that non-magnetic fixing piece is axially worn every magnetic mouth using the second quadrature axis magnetic circuit, it is real
Fixation of the existing lamination in rotor axial.
In general, through the invention it is contemplated above technical scheme is compared with the prior art, can obtain down and show
Beneficial effect:
The present invention is combined superposition using the silicon steel sheet of two kinds of topological structures, wherein the topological structure of one group of lamination
Magnet steel brow leakage can largely be reduced, to reduce the electric current that magnetizes, and improve torque density；Another set lamination
Topological structure can increase quadrature-axis reluctance, reduce axis inductor, to increase reluctance torque, improve torque density；By two kinds
Silicon steel laminations combination is laminated to realize the molding method of rotor core, than increasing sleeve in addition with the routine side of fixed rotor lamination
Legal system makes simple process, avoids and increases in the presence of vortex in problem, such as sleeve brought by sleeve, so that loss increases, increases
Jacketed cylinder makes gas length become larger, and magnetic circuit reluctance becomes larger, and reduces the fan-out capability of motor.And cleverly using quadrature axis magnetic every
The through-hole that the gap of slot is worn as non-magnetic fixing piece avoids the influence for additionally doing through-hole to rotor magnetic circuit.
Detailed description of the invention
Fig. 1 is the structural schematic diagram for the lamination one realized according to the present invention；
Fig. 2 is the structural schematic diagram for the lamination two realized according to the present invention；
Fig. 3 is the structural schematic diagram of formation rotor core after the rotor core silicon steel plate stacking realized according to the present invention.
In all the appended drawings, identical appended drawing reference is used to denote the same element or structure, in which:
Magnetic bridge 4,5,6- between 1- rotor core silicon steel sheet 2- magnet steel mouth 3- quadrature axis magnetic circuit magnet isolation tank and rotor diameter
Magnetic bridge 8- quadrature axis magnetic circuit magnetic bridge slot of the quadrature axis magnetic circuit between magnetic mouth 7- magnet steel end and rotor diameter and rotor diameter it
Between magnetic bridge open circuit 9- magnet steel end and rotor diameter between magnetic bridge open circuit 10, the composite structure 11,13- of 12- lamination one
The composite structure 14 of lamination two, 15- rivet
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.As long as in addition, technical characteristic involved in the various embodiments of the present invention described below
Not constituting a conflict with each other can be combined with each other.
As shown in Figure 1, being magnetize electric current and the raising turn for becoming flux permanent magnet synchronous motor according to the reduction that the present invention realizes
The structural schematic diagram of unimproved lamination one in the rotor core 1 of square density, it can be seen that its primary structure are as follows: rotor iron
Heart silicon steel sheet 1, magnet steel are embedded in notch 2, for being capable of forming groove body after being overlapped to accommodate magnet steel, select in the present invention
Selecting magnet steel is cutting orientation magnetizing direction, and makes above-mentioned magnet steel using the permanent-magnet material with low-coercivity, straight by stator
Shaft current impulse vector control fills demagnetization to realize.
Wherein, it is additionally provided between magnet steel insertion notch 2 and does not form the first of fracture every magnetic mouth 4 in lamination outer,
Primarily form quadrature axis magnetic circuit magnet isolation tank, first between magnetic mouth 4 and rotor diameter the part of non-fracture be known as magnetic bridge 3, to hand over
The main thoroughfare of axis magnetic linkage, therefore its width, i.e., length radially directly affect the magnetic resistance of quadrature axis magnetic circuit, to influence quadrature axis electricity
Sense, and 3 width of magnetic bridge is smaller, and the magnetic resistance of quadrature axis magnetic circuit is bigger, inductance is smaller, if therefore in circumferential direction completely by magnetic bridge 3
It disconnects, quadrature axis magnetic circuit can be made to be blocked completely, magnetic circuit reluctance is maximum.
In addition, also on the camber line using radial direction as normal, being symmetricly set on magnet steel in addition to setting first is every magnetic mouth 4
The second quadrature axis magnetic circuit of 2 two sides of notch is embedded in every magnetic mouth 5,6, and the second quadrature axis magnetic circuit can spread out every magnetic mouth along radial direction
It is raw be arranged in parallel it is multiple, it is possible thereby to increase the magnetic resistance of quadrature axis magnetic circuit to reduce axis inductor, so that axis inductor is less than
D-axis inductance；
It is magnetic bridge 7 that magnet steel, which is embedded in the part between 2 end of notch and the non-fracture of rotor diameter, is the master of magnet steel brow leakage
Influence factor is wanted, and generates leakage field when magnet steel magnetizes, leads to electric current increase of magnetizing.
It further, can as shown in Fig. 2, in order to reduce magnetize electric current and the axis inductor that become flux permanent magnet synchronous motor
To take the method for being fully disconnected 3 and 7, as shown in 8 and 9, the leakage field magnetic circuit of magnet steel end can be separated by disconnecting 7, to reduce
On the one hand magnet steel brow leakage can make unloaded air gap flux density increase, improve torque density, on the other hand avoid pulsed magnetic
Magnet steel brow leakage occurs when field magnetizes to magnet steel, so that the current reduction that magnetizes；Disconnecting 3 can be complete by quadrature axis magnetic circuit
Complete to block, so that quadrature-axis reluctance increases, axis inductor is reduced, to increase the salient pole ratio of rotor, increases reluctance torque.
In addition, above two lamination is to produce rotor core as follows, silicon steel plate stacking method such as Fig. 3
Shown, wherein 10 and 12 laminate the structure of composition for lamination one, 11 and 13 be the composite structure of four laminations two, is had described above
It is found that make to magnetize, electric current is smaller, and torque density is higher, and the quantity of lamination one is the smaller the better, but can be accounted for simultaneously
The mechanically stressed of rotor is born, therefore the present invention comprehensively considers iron core axial length, motor electromagnetic performance and mechanically stressed situation,
The quantitative proportion of lamination one and lamination two is preferably arranged to 1:4, and in order to make lamination uniform force in the axial direction, it will
Lamination one and two interleaved of lamination are placed, and such as 10, positional relationship shown in 11,12,13.
When the lamination being entirely composed combining fixed, it can be adopted as what non-permeable material was made into
The shape of rivet 14,15, cross section is identical as the shape of Fig. 1 interval magnetic mouth 6, and passes through every magnetic mouth 6.The present invention by lamination one with
Lamination two is combined according to shown in Fig. 3, then by Fig. 3 with 14, eight portions of 15 identical eight rivets to lamination two
Divide and carry out axial restraint with lamination one, the molding of rotor core can be realized.
When each part of lamination two is overlapped together by rivet and lamination one, since lamination one is perpendicular to axis
To dimension on be an entirety, and have an identical active force to each part of lamination two in this dimension, therefore a lamination two
Eight parts of dispersion just entirety constant at relative position, to realize the molding of rotor core.In the present invention
By taking two kinds of number of laminations ratio 1:4 as an example, this ratio can according to the actual situation depending on, such as rotor core axial length and silicon steel
Mechanically stressed situation of thickness and rotor of piece etc..
According to the topological structure for the change flux permanent magnet synchronous motor that the present invention realizes, following technical advantage can be realized:
The topological structure of lamination two can largely reduce magnet steel brow leakage, to reduce the electric current that magnetizes, reduce inverter
Capacitance grade, and improve torque density；In addition it can increase quadrature-axis reluctance, reduce axis inductor, to increase salient pole ratio, increase
Big reluctance torque；Two kinds of silicon steel sheet combinations are laminated to realize the molding method of rotor core, than increasing sleeve in addition with fixation
The conventional method manufacturing process of rotor pack is simple, avoids and increases problem brought by sleeve, and cleverly utilizes quadrature axis
The through-hole that the gap of magnetic separate slot wears as non-magnetic fixing piece avoids the influence for additionally doing through-hole to rotor magnetic circuit.
As it will be easily appreciated by one skilled in the art that the foregoing is merely illustrative of the preferred embodiments of the present invention, not to
The limitation present invention, any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention are all contained in
Within protection scope of the present invention.
Claims (5)
1. a kind of rotor core for becoming flux permanent magnet synchronous motor, which is characterized in that the rotor core is by rotor core lamination
It is formed by stacking, the rotor core lamination includes first kind lamination and Second Type lamination, forms the rotor iron in superposition
During heart lamination, the first kind lamination and the Second Type lamination are staggered；
Wherein, the first kind lamination is annular structure, and distribution is provided with several not in outer shape in a circumferential direction
Notch (2) are embedded at the magnet steel of fracture, are used to form the installation for changing the magnet steel of the intensity of magnetization by changing the electric current that magnetizes
Slot penetrates through between first kind lamination magnet steel insertion notch end and rotor internal diameter, also sets between magnet steel insertion notch (2)
Be equipped with not first kind lamination outer formed fracture first every Ci Kou (4)；
The Second Type lamination is annular structure, and distribution in a circumferential direction, which is provided with, several forms fracture in outer
Magnet steel is embedded in notch (2), is used to form the mounting groove for changing the magnet steel of the intensity of magnetization by changing the electric current that magnetizes, the second class
It is disrupted configuration between notch end and rotor diameter that type lamination magnet steel, which is embedded in, Second Type lamination magnet steel be embedded in notch end with
Penetrated through between rotor internal diameter, be additionally provided between magnet steel insertion notch (2) formed in first kind lamination outer it is disconnected
The first of mouth is every Ci Kou (4)；
On the first kind lamination and the Second Type lamination, also has and be symmetrically distributed in the magnet steel insertion notch
(2) the second quadrature axis magnetic circuit along d-axis magnetic linkage direction of two sides is every Ci Kou, so that axis inductor is less than d-axis inductance.
2. becoming the rotor core of flux permanent magnet synchronous motor as described in claim 1, which is characterized in that the second quadrature axis magnetic
Every magnetic mouth, multiple (5,6) are arranged in parallel arrangement in radial directions on road.
3. becoming the rotor core of flux permanent magnet synchronous motor as claimed in claim 1 or 2, which is characterized in that the first kind
During type lamination and the Second Type lamination are staggeredly superposed, the first part of the multiple superposition formation of first kind lamination
It is staggered with the multiple second parts formed that are superimposed of the Second Type lamination.
4. becoming the rotor core of flux permanent magnet synchronous motor as claimed in claim 3, which is characterized in that the Second Type is folded
The ratio of piece quantity and the first kind number of laminations is 4:1.
5. becoming the rotor core of flux permanent magnet synchronous motor as claimed in claim 4, which is characterized in that handed over using described second
Axis magnetic circuit makees the through-hole that non-magnetic fixing piece is axially worn every magnetic mouth, realizes the lamination in the fixation of rotor axial.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610290627.4A CN105896772B (en) | 2016-05-05 | 2016-05-05 | A kind of rotor core becoming flux permanent magnet synchronous motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610290627.4A CN105896772B (en) | 2016-05-05 | 2016-05-05 | A kind of rotor core becoming flux permanent magnet synchronous motor |
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| Publication Number | Publication Date |
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| CN105896772A CN105896772A (en) | 2016-08-24 |
| CN105896772B true CN105896772B (en) | 2019-01-04 |
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| CN201610290627.4A Expired - Fee Related CN105896772B (en) | 2016-05-05 | 2016-05-05 | A kind of rotor core becoming flux permanent magnet synchronous motor |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110611386B (en) * | 2019-10-10 | 2020-11-06 | 珠海格力节能环保制冷技术研究中心有限公司 | Motor rotor, motor and compressor |
| CN116827014A (en) * | 2023-06-21 | 2023-09-29 | 浙江大学 | Magnetic bridge type rotor structure for synchronous motor |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1233876A (en) * | 1998-12-09 | 1999-11-03 | 宁波东方通用电气公司西安分公司 | Brushless DC electric lift motor structure having rare-earth permanent-manget |
| TW427047B (en) * | 1999-02-26 | 2001-03-21 | Adlee Powertronic Co Ltd | High efficiency permanent magnetic motor for high speed and heavy load |
| CN103441592A (en) * | 2013-08-12 | 2013-12-11 | 浙江大学 | Novel magnetic flux adjustable permanent magnet synchronous motor |
| CN104079092A (en) * | 2014-06-24 | 2014-10-01 | 广东威灵电机制造有限公司 | Rotor core and motor with same |
| CN104205571A (en) * | 2012-02-10 | 2014-12-10 | Ksb股份公司 | Rotor and reluctance motor |
-
2016
- 2016-05-05 CN CN201610290627.4A patent/CN105896772B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1233876A (en) * | 1998-12-09 | 1999-11-03 | 宁波东方通用电气公司西安分公司 | Brushless DC electric lift motor structure having rare-earth permanent-manget |
| TW427047B (en) * | 1999-02-26 | 2001-03-21 | Adlee Powertronic Co Ltd | High efficiency permanent magnetic motor for high speed and heavy load |
| CN104205571A (en) * | 2012-02-10 | 2014-12-10 | Ksb股份公司 | Rotor and reluctance motor |
| CN103441592A (en) * | 2013-08-12 | 2013-12-11 | 浙江大学 | Novel magnetic flux adjustable permanent magnet synchronous motor |
| CN104079092A (en) * | 2014-06-24 | 2014-10-01 | 广东威灵电机制造有限公司 | Rotor core and motor with same |
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| CN105896772A (en) | 2016-08-24 |
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