CN211018436U - Motor rotor, reluctance motor and electric automobile - Google Patents
Motor rotor, reluctance motor and electric automobile Download PDFInfo
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- CN211018436U CN211018436U CN201922186596.XU CN201922186596U CN211018436U CN 211018436 U CN211018436 U CN 211018436U CN 201922186596 U CN201922186596 U CN 201922186596U CN 211018436 U CN211018436 U CN 211018436U
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Abstract
The application provides a motor rotor, reluctance motor and electric automobile. This electric motor rotor includes rotor core (1), rotor core (1) includes interior annular portion (2) and outer annular portion (3), interior annular portion (2) are provided with a plurality of magnetic barrier groups along circumference, every magnetic barrier group includes at least two interior magnetic flux barriers (4) that set up along radial interval, magnetic conduction passageway (5) in forming between two adjacent interior magnetic flux barriers (4), outer annular portion (3) are provided with a plurality of outer magnetic flux barriers (6) along the circumference interval, form outer magnetic flux channel (7) along radially extending between adjacent outer magnetic flux barriers (6). According to the motor rotor of the application, the air gap waveform of the reluctance motor can be changed, the waveform is optimized, the sine degree is increased, the motor efficiency is improved, and the motor torque pulsation is reduced.
Description
Technical Field
The application relates to the technical field of motor equipment, in particular to a motor rotor, a reluctance motor and an electric automobile.
Background
The motor is an important component of modern society, the power consumption of the motor accounts for more than 30% of the power consumption of human society every year, rare resource rare earth metal is required to be used for the permanent magnet synchronous motor with high efficiency, and the energy efficiency of the asynchronous motor using conventional materials is difficult to break through greatly. The permanent magnet auxiliary synchronous reluctance motor rotor is provided with multiple layers of magnetic barriers, and ferrite magnetic steel is placed in the magnetic barriers, so that the high efficiency close to a rare earth permanent magnet motor is achieved, meanwhile, the cost is greatly lower than that of the rare earth motor, and the problem can be well solved.
The permanent magnet auxiliary synchronous reluctance motor rotor is composed of a plurality of rotor punching sheets, each rotor punching sheet is provided with a plurality of layers of air grooves called magnetic barriers, and certain permanent magnets are placed in the magnetic barriers. And a magnetic conduction channel is arranged between every two layers of magnetic barriers, and a magnetic field passes through the air gap through the magnetic conduction channel on the excircle of the rotor and then flows to the tooth part of the stator. The quality of the air gap flux density waveform depends on the arrangement of magnetic barriers to a great extent, and the sine degree of the air gap flux density waveform is poor, so that the iron loss of the motor is large, the efficiency is reduced, and the torque pulsation is increased. The permanent magnet auxiliary synchronous reluctance motor is limited by the space of a rotor and the processing difficulty, and the number of layers of magnetic barriers and the space for adjusting the placing position of the magnetic barriers of the permanent magnet auxiliary synchronous reluctance motor are not large, so that the iron loss is difficult to effectively reduce, the energy efficiency is improved, and the torque pulsation is weakened.
SUMMERY OF THE UTILITY MODEL
Therefore, the technical problem that this application will be solved lies in providing a motor rotor, reluctance motor and electric automobile, can change reluctance motor's air gap waveform, optimizes the waveform, increases the sine degree, promotes motor efficiency, reduces motor torque ripple.
In order to solve the above problem, the present application provides a motor rotor, including rotor core, rotor core includes interior annular portion and outer annular portion, and interior annular portion is provided with a plurality of magnetic barrier groups along circumference, and every magnetic barrier group includes at least two interior magnetic flux barriers along radial interval setting, and magnetic conduction passageway in forming between two adjacent interior magnetic flux barriers, and outer annular portion is provided with a plurality of outer magnetic flux barriers along circumference interval, forms the outer magnetic flux channel along radial extension between the adjacent outer magnetic flux barrier.
Preferably, the number of outer flux barriers is greater than twice the number of inner flux barriers.
Preferably, the inner magnetic conduction channel is in the same direction as the outer magnetic conduction channel radially outside the inner magnetic conduction channel.
Preferably, a permanent magnet is arranged in the inner magnetic conduction barrier, and the inner magnetic conduction channel extends along the direction of the Q axis.
Preferably, the outer magnetic conductive channel is parallel to the direction of the D axis of the pole on which it is located.
Preferably, the radially outer edge of the outer flux barrier is provided with a chamfered edge on a side thereof adjacent the D-axis.
Preferably, the included angle between the central line of the external magnetic flux barrier and the D axis is omega, wherein the angle is more than or equal to 0 degrees and less than or equal to 20 degrees.
Preferably, the number of layers of the outer magnetic flux barriers is C1, the number of layers of the inner magnetic flux barriers is C2, and the greatest common divisor GCD (C1, C2) of C1 and C2 is 1.
Preferably, the inner magnetic flux barrier is V-shaped, and the permanent magnets are arranged in two side grooves of the inner magnetic flux barrier; or the inner magnetic flux barrier is in a flat-bottom V shape, and the permanent magnets are arranged in the two side grooves of the inner magnetic flux barrier; or the inner magnetic flux barrier is in a flat-bottom V shape, and the permanent magnet is arranged in the bottom groove of the inner magnetic flux barrier; or the inner magnetic flux barrier is U-shaped, and the permanent magnets are arranged in the two side grooves of the inner magnetic flux barrier; or the inner magnetic flux barrier is U-shaped, and the permanent magnet is arranged in the bottom groove of the inner magnetic flux barrier.
According to another aspect of the present application, a reluctance motor is provided, which includes a motor rotor and a motor stator, wherein the motor rotor is the motor rotor described above.
Preferably, when the motor rotor comprises a chamfered edge, the motor stator comprises a stator tooth shoe, the outlet width of the outer magnetic conduction channel is wd, and the width of the inner peripheral wall of the stator tooth shoe is wt, wherein wd is more than or equal to 0.25wt and less than or equal to 0.4 wt.
Preferably, the number of the layers of the outer magnetic flux barriers is C1, the number of the stator teeth of the stator of the motor is Z, and the greatest common divisor of C1 and Z is GCD (Z, C1), wherein GCD (Z, C1) is less than or equal to 3.
According to another aspect of the application, an electric vehicle is provided, which comprises the motor rotor or the reluctance motor.
The application provides a motor rotor, including rotor core, rotor core includes interior annular portion and outer annular portion, and interior annular portion is provided with a plurality of magnetic barriers group along circumference, and every magnetic barrier group includes at least two interior magnetic flux barriers that set up along radial interval, and magnetic conduction passageway in forming between two adjacent interior magnetic flux barriers, and outer annular portion is provided with a plurality of outer magnetic flux barriers along the circumference interval, forms the outer magnetic flux channel along radial extension between the adjacent outer magnetic flux barriers. Through dividing into two regions of interior ring portion and outer loop portion with rotor core along radial direction, can utilize the great characteristics of rotor excircle relative space, carry out different structural design to the magnetic conduction passageway of interior ring portion and outer loop portion, can plan to the magnetic flux barrier and the magnetic conduction passageway of outer loop portion according to the magnetic flux barrier of interior ring portion and the structure of magnetic conduction passageway, can make the number of piles and the locating position of the magnetic flux barrier of outer loop portion better, thereby can change the air gap waveform, optimize the waveform, increase the sine, promote motor efficiency, reduce torque pulsation.
Drawings
Fig. 1 is a schematic structural diagram of a rotor of an electric machine according to an embodiment of the present application;
fig. 2 is a schematic view of a magnetic conduction channel trend structure of a motor rotor according to an embodiment of the present application;
fig. 3 is a configuration diagram of an external magnetic flux barrier of a rotor of a motor according to an embodiment of the present application;
FIG. 4 is a schematic structural diagram of a rotor of an electric machine according to another embodiment of the present application;
FIG. 5 is a schematic structural diagram of a rotor of an electric machine according to yet another embodiment of the present application;
FIG. 6 is a dimensional block diagram of a rotor of an electric machine according to an embodiment of the present application;
FIG. 7 is a diagram illustrating a comparison of air gap flux densities of different numbers of outer flux barrier layers of a rotor of a motor according to an embodiment of the present disclosure;
fig. 8 is a diagram illustrating an influence of the number of outer magnetic flux barrier layers on torque ripple of the motor rotor according to the embodiment of the present application;
FIG. 9 is a diagram illustrating the influence of the turning angle of the outer flux barriers on the torque output of the motor rotor according to the embodiment of the present disclosure;
fig. 10 is a graph showing the influence of the tooth width of the rotor of the motor to the outlet width of the outer magnetic conduction channel on the torque ripple.
The reference numerals are represented as:
1. a rotor core; 2. an inner ring portion; 3. an outer ring portion; 4. an internal magnetic flux barrier; 5. an inner magnetic conduction channel; 6. an external magnetic flux barrier; 7. an outer magnetic channel; 8. chamfering; 9. a permanent magnet; 10. a motor stator; 11. and a stator tooth shoe.
Detailed Description
With combined reference to fig. 1 to 10, according to an embodiment of the present application, a motor rotor includes a rotor core 1, where the rotor core 1 includes an inner ring portion 2 and an outer ring portion 3, the inner ring portion 2 is circumferentially provided with a plurality of magnetic barrier groups, each magnetic barrier group includes at least two inner magnetic flux barriers 4 radially spaced apart from each other, an inner magnetic conduction channel 5 is formed between two adjacent inner magnetic flux barriers 4, the outer ring portion 3 is circumferentially spaced apart from each other by a plurality of outer magnetic flux barriers 6, and an outer magnetic conduction channel 7 radially extending is formed between adjacent outer magnetic flux barriers 6. Wherein the inner flux barriers 4 and the outer flux barriers 6 are radially spaced apart.
In the present embodiment, the radially inner circumferential wall of each outer magnetic flux barrier 6 is located on the same circumference, the radially outer circumferential wall of each inner magnetic flux barrier 4 is located on the same circumference, and the diameter of the circumference where the outer magnetic flux barrier 6 is located is larger than the diameter of the circumference where the inner magnetic flux barrier 4 is located.
The air gap flux density waveform is determined by the synthesis of a rotor magnetic field and a stator magnetic field, and for a permanent magnet auxiliary synchronous reluctance motor, the number of teeth of a stator is usually greater than the number of rotor magnetic barrier layers, so that the air gap magnetic field waveform sine degree is poor, the harmonic content is relatively high, the harmonic loss is large, and the torque pulsation is high; meanwhile, the dead-side area of the magnetic field of the stator and the rotor is small, the magnetic flux leakage is more, the torque output is not high, and the efficiency is lower.
This application is through dividing into rotor core 1 along radial direction interior ring portion 2 and outer loop portion 3 two regions, can utilize the great characteristics in rotor excircle relative space, carry out different structural design to interior ring portion 2 and outer loop portion 3's magnetic conduction passageway, can plan to the magnetic flux barrier and the magnetic conduction passageway of outer loop portion 3 according to the magnetic flux barrier of interior ring portion 2 and the structure of magnetic conduction passageway, can make the number of piles and the locating place of outer loop portion 3's magnetic flux barrier better, thereby overcome the problem that rotor magnetic flux barrier number of piles is too few among the prior art, can change the air gap waveform more effectively, optimize the waveform, increase the sine degree, promote motor efficiency, reduce torque pulsation.
Preferably, the number of outer magnetic flux barriers 6 is greater than twice the number of inner magnetic flux barriers 4. In this embodiment, under the same pole, the number of the outer magnetic flux barriers 6 is the total number of the outer magnetic flux barriers 6 located under the pole, the number of the inner magnetic flux barriers 4 is the number of layers of the inner magnetic flux barriers 4 arranged in the radial direction, and since the outer magnetic flux barriers 6 are arranged at both ends of each inner magnetic flux barrier 4, the number of the outer magnetic flux barriers 6 is greater than twice the number of the inner magnetic flux barriers 4, so that the number of the outer magnetic flux barriers 6 at both ends of the inner magnetic flux barrier 4 can be ensured to be greater than the number of layers of the inner magnetic flux barriers 4, and the air gap magnetic density at the intersection of the rotor magnetic field and the stator magnetic field is optimized by using the advantage of the greater number of the outer magnetic flux barriers 6, and the relationship between the number of stator slots and the number of layers of the rotor magnetic barriers is changed to achieve the purposes of optimizing the air gap magnetic density and reducing.
As for the outer magnetic flux barriers 6, the number of layers of the outer magnetic flux barriers 6 means the number of the outer magnetic flux barriers 6 located on the side of the center line of the same pole under the same pole.
The extending directions of the inner magnetic conduction channel 5 and the outer magnetic conduction channel 7 on the radial outer side of the inner magnetic conduction channel are consistent, the air gap waveform between the stator and the rotor can be changed, the extending directions of the inner magnetic conduction channel and the outer magnetic conduction channel are good in consistency, magnetic lines of force can rapidly and effectively pass through an air gap, magnetic flux leakage is reduced, and the working efficiency of the motor is improved.
In the present embodiment, the permanent magnet 9 is disposed in the inner magnetic flux barrier 4, and the inner magnetic flux guide 5 extends in the Q-axis direction. Through setting up permanent magnet 9, can utilize permanent magnet 9 to assist the reluctance machine, and then improve motor efficiency and power factor.
The permanent magnet auxiliary synchronous reluctance motor rotor is formed by laminating a plurality of rotor punching sheets, each rotor punching sheet is punched with a plurality of air grooves called magnetic barriers, a certain amount of ferrite permanent magnets are placed in the magnetic barriers, silicon steel sheets are arranged between every two layers of magnetic barriers called magnetic conduction channels, and the magnetic conduction channels and the magnetic barriers always appear in pairs. The permanent magnet auxiliary synchronous reluctance motor rotor magnetic barrier is internally provided with ferrite magnetic steel to generate a rotor magnetic field, the rotor magnetic field passes through the magnetic conduction channels of the two arms along the direction of the magnetic conduction channel, and finally penetrates out of the magnetic conduction channel on the excircle of the rotor to enter an air gap.
Preferably, the outer magnetic conduction channel 7 is parallel to the direction of the D axis of the pole where the outer magnetic conduction channel is located, so that a magnetic field can smoothly enter or flow out of the motor rotor through an air gap, the flow resistance of the magnetic field is reduced, the flow efficiency of the magnetic field is improved, the working performance of the motor is improved, and the output torque of the motor is improved.
One side of the radial outer edge of the outer magnetic flux barrier 6, which is close to the D shaft, is provided with a chamfered edge 8, and the chamfered edge 8 can guide the intersecting position of the rotor magnetic field and the stator magnetic field, so that the torque pulsation can be effectively optimized, and the rotation noise of the motor is reduced.
The included angle between the center line of the external magnetic barrier 6 and the D axis is omega, wherein omega is more than or equal to 0 degree and less than or equal to 20 degrees, thereby avoiding overlarge magnetic field flow resistance caused by overlarge included angle between the center line of the external magnetic barrier 6 and the D axis and reducing the adverse effect of the external magnetic barrier 6 on the output torque of the motor.
The number of layers of the outer magnetic flux barriers 6 is C1, the number of layers of the inner magnetic flux barriers 4 is C2, and the greatest common divisor GCD (C1, C2) of C1 and C2 is 1, so that the number of alternating periods of a magnetic field can be increased, the alternating amplitude can be reduced, the air gap flux density and the torque ripple are further optimized, the torque ripple is more effectively reduced, and the torque output of the motor is improved. In the present embodiment, the number of layers of the inner magnetic flux barriers 4 is 4, and the number of layers of the outer magnetic flux barriers 6 is 7.
In one embodiment, the inner flux barriers 4 are V-shaped, and the permanent magnets 9 are arranged in two side slots of the inner flux barriers 4.
In another embodiment, the inner flux barriers 4 are V-shaped with a flat bottom and the permanent magnets 9 are arranged in two side slots of the inner flux barriers 4.
In another embodiment, the inner flux barrier 4 is V-shaped with a flat bottom and the permanent magnet 9 is arranged in a bottom slot of the inner flux barrier 4.
In another embodiment, the inner flux barriers 4 are U-shaped and the permanent magnets 9 are arranged in two side slots of the inner flux barriers 4.
In another embodiment the inner flux barrier 4 is U-shaped and the permanent magnet 9 is arranged in a bottom slot of the inner flux barrier 4.
In another embodiment, the inner flux barriers 4 are V-shaped with a flat bottom, and the permanent magnets 9 are arranged in both the bottom slot and the two side slots of the inner flux barriers 4.
In other embodiments, the inner magnetic flux barriers 4 may also be circular arc-shaped, and the permanent magnets 9 may be disposed at both ends of the inner magnetic flux barriers 4 or at the bottom of the inner magnetic flux barriers 4.
In the present application, because the arrangement of the inner magnetic flux barriers 4 must meet certain structural requirements, it is ensured that the magnetic force lines can smoothly pass through the inner magnetic conduction channels 5 between the adjacent inner magnetic flux barriers 4 to enter and exit the motor rotor, so the magnetic conduction directions of the inner magnetic conduction channels 5 are often not optimal, and the magnetic force lines can pass through a larger angle turn in the process of flowing out of or entering the inner magnetic conduction channels 5 from the inner magnetic conduction channels 5, which not only can reduce torque output, but also can increase torque pulsation. The outer magnetic flux barriers 6 are arranged on the outer ring part 3, so that the arrangement direction of the outer magnetic flux barriers 6 can be independent of the arrangement direction of the inner magnetic flux barriers 4, the magnetic conduction direction of the outer magnetic conduction channel 7 is different from that of the inner magnetic conduction channel 5, the magnetic conduction direction of the outer magnetic conduction channel 7 can be adjusted, the turning angle of the magnetic force lines in the flowing process can be reduced, the flowing resistance of the magnetic force lines can be reduced, the torque output of the motor can be improved, and the torque pulsation can be reduced.
The permanent magnet 9 is, for example, a ferrite permanent magnet or a neodymium iron boron permanent magnet.
According to an embodiment of the present application, a reluctance machine includes a machine rotor, which is the machine rotor described above, and a machine stator 10.
Preferably, when the motor rotor comprises the chamfered edge 8, the motor stator 10 comprises a stator tooth shoe 11, the outlet width of the outer magnetic conduction channel 7 is wd, and the inner peripheral wall width of the stator tooth shoe 11 is wt, wherein wd is more than or equal to 0.25wt and less than or equal to 0.4wt, so that the outlet width of the outer magnetic conduction channel 7 can be more matched with the inner peripheral wall width of the stator tooth shoe 11, and the torque pulsation can be more effectively optimized.
The number of layers of the outer magnetic flux barriers 6 is C1, the number of stator teeth of the motor stator 10 is Z, the greatest common divisor of C1 and Z is GCD (Z, C1), wherein GCD (Z, C1) is less than or equal to 3, and at the moment, the optimization effect of air gap flux density and torque ripple of the motor is better, as shown in FIG. 7.
According to an embodiment of the application, the electric vehicle comprises the motor rotor or the reluctance motor.
It is readily understood by a person skilled in the art that the advantageous ways described above can be freely combined, superimposed without conflict.
The present invention is not intended to be limited to the particular embodiments shown and described, but is to be accorded the widest scope consistent with the principles and novel features herein disclosed. The foregoing is only a preferred embodiment of the present application, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present application, and these modifications and variations should also be considered as the protection scope of the present application.
Claims (13)
1. The motor rotor is characterized by comprising a rotor core (1), wherein the rotor core (1) comprises an inner ring portion (2) and an outer ring portion (3), the inner ring portion (2) is provided with a plurality of magnetic barrier groups along the circumferential direction, each magnetic barrier group comprises at least two inner magnetic flux barriers (4) arranged along the radial direction at intervals, an inner magnetic conduction channel (5) is formed between every two adjacent inner magnetic flux barriers (4), the outer ring portion (3) is provided with a plurality of outer magnetic flux barriers (6) along the circumferential direction at intervals, and an outer magnetic conduction channel (7) extending along the radial direction is formed between every two adjacent outer magnetic flux barriers (6).
2. An electric machine rotor according to claim 1, characterized in that the number of outer flux barriers (6) is more than twice the number of inner flux barriers (4).
3. An electric machine rotor, according to claim 1, characterised in that said inner magnetically conductive channel (5) coincides with the extension direction of its radially outer magnetically conductive channel (7).
4. An electric machine rotor according to claim 1 or 2, characterized in that permanent magnets (9) are arranged in the inner flux barrier (4), and the inner magnetically permeable channel (5) extends in the direction of the Q-axis.
5. An electric machine rotor, according to claim 4, characterised in that said outer magnetically conductive channel (7) is parallel to the D-axis direction of the pole in which it is located.
6. An electric machine rotor according to claim 4, characterised in that the radially outer edge of the outer flux barrier (6) is provided with a chamfered edge (8) on the side close to the D-axis.
7. An electric machine rotor according to claim 4, characterised in that the centre line of the outer flux barrier (6) forms an angle ω with the D-axis, where 0 ° ≦ ω ≦ 20 °.
8. The electric machine rotor as recited in claim 1, characterized in that the number of layers of the outer flux barriers (6) is C1, the number of layers of the inner flux barriers (4) is C2, and the greatest common divisor of C1 and C2, GCD (C1, C2), is 1.
9. An electric machine rotor according to claim 4, characterised in that the inner flux barriers (4) are V-shaped, the permanent magnets (9) being arranged in two side slots of the inner flux barriers (4); or the inner magnetic flux barrier (4) is in a flat-bottom V shape, and the permanent magnets (9) are arranged in two side grooves of the inner magnetic flux barrier (4); or, the inner magnetic flux barrier (4) is in a flat-bottom V shape, and the permanent magnet (9) is arranged in a bottom groove of the inner magnetic flux barrier (4); or, the inner magnetic flux barrier (4) is U-shaped, and the permanent magnets (9) are arranged in two side grooves of the inner magnetic flux barrier (4); or the inner magnetic flux barrier (4) is U-shaped, and the permanent magnet (9) is arranged in a bottom groove of the inner magnetic flux barrier (4).
10. A reluctance machine comprising a machine rotor and a machine stator (10), characterized in that the machine rotor is a machine rotor according to any one of claims 1 to 9.
11. A reluctance machine according to claim 10, wherein when the machine rotor comprises chamfered edges (8), the machine stator (10) comprises stator tooth shoes (11), the outlet width of the outer magnetic conducting channel (7) is wd, the width of the inner circumferential wall of the stator tooth shoes (11) is wt, wherein 0.25wt ≦ wd ≦ 0.4 wt.
12. A reluctance machine according to claim 10, wherein the number of layers of the outer flux barriers (6) is C1, the stator teeth number of the machine stator (10) is Z, the greatest common divisor of C1 and Z is GCD (Z, C1), wherein GCD (Z, C1) is ≦ 3.
13. An electric vehicle comprising an electric machine rotor according to any of claims 1 to 9 or a reluctance electric machine according to any of claims 10 to 12.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922186596.XU CN211018436U (en) | 2019-12-09 | 2019-12-09 | Motor rotor, reluctance motor and electric automobile |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922186596.XU CN211018436U (en) | 2019-12-09 | 2019-12-09 | Motor rotor, reluctance motor and electric automobile |
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| Publication Number | Publication Date |
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| CN211018436U true CN211018436U (en) | 2020-07-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201922186596.XU Active CN211018436U (en) | 2019-12-09 | 2019-12-09 | Motor rotor, reluctance motor and electric automobile |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110957830A (en) * | 2019-12-09 | 2020-04-03 | 珠海格力电器股份有限公司 | Motor rotors, reluctance motors and electric vehicles |
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2019
- 2019-12-09 CN CN201922186596.XU patent/CN211018436U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110957830A (en) * | 2019-12-09 | 2020-04-03 | 珠海格力电器股份有限公司 | Motor rotors, reluctance motors and electric vehicles |
| CN110957830B (en) * | 2019-12-09 | 2025-03-18 | 珠海格力电器股份有限公司 | Motor rotors, reluctance motors and electric vehicles |
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