CN210608722U - Motor rotor punching sheet and motor rotor - Google Patents
Motor rotor punching sheet and motor rotor Download PDFInfo
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- CN210608722U CN210608722U CN201921100008.XU CN201921100008U CN210608722U CN 210608722 U CN210608722 U CN 210608722U CN 201921100008 U CN201921100008 U CN 201921100008U CN 210608722 U CN210608722 U CN 210608722U
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Abstract
The utility model discloses an electric motor rotor is towards piece and electric motor rotor has solved the higher technical problem of motor NVH among the prior art. This electric motor rotor is towards piece includes towards the piece body, is close to towards the outer periphery equipartition of piece body has a plurality of magnetic pole, sets up three magnet steel groove under every magnetic pole, and every magnet steel inslot is embedded to have a magnet steel, first magnet steel groove and second magnet steel groove symmetrical arrangement, the two width direction with towards the radial slope of piece body, be the outside V font of opening, the angle of V font is not less than 100, and the third magnet steel groove is located the centre in first magnet steel groove and second magnet steel groove, the width direction perpendicular to towards the radial of piece body, be a font. The utility model discloses an optimize magnet steel overall arrangement and the polar arc coefficient in the rotor punching for the distortion rate in the no-load air gap magnetic field of motor descends, has improved the sine degree in air gap magnetic field between stator, rotor, finally makes under the prerequisite that the motor performance keeps unchangeable, effectively reduces the NVH of motor.
Description
Technical Field
The utility model relates to the technical field of electric machines, concretely relates to electric motor rotor is towards piece. The utility model discloses still relate to an electric motor rotor.
Background
With the development of automobile manufacturing industry, the NVH performance of automobiles becomes a comprehensive technical index of the manufacturing quality of modern automobiles. NVH is an english abbreviation for Noise, Vibration and Harshness (Noise, Vibration, Harshness). NVH gives the car user the most immediate and superficial experience. The NVH problem of vehicles is one of the concerns of various large vehicle manufacturing enterprises and component enterprises in the international automotive industry. Statistics show that 1/3 fault problems of the whole automobile is related to NVH problems of the automobile.
The main excitation sources influencing the noise level in the vehicle are components such as an engine, a motor, a speed reducer, tires and the like. For electric vehicles, the primary source of excitation is from the electric machine. Along with the requirements of people on the dynamic performance of automobiles, the necessity of developing a motor with high power density and high torque density is more and more urgent, and meanwhile, the motor needs to be ensured to have continuously optimized NVH performance, which brings great challenges to the development work of the motor.
SUMMERY OF THE UTILITY MODEL
To the above-mentioned problem among the prior art, the utility model provides an electric motor rotor is towards piece can make the no-load air gap magnetic field's of motor distortion rate descend, has improved the sine degree of air gap magnetic field between stator, rotor, finally makes under the prerequisite that the motor performance keeps unchangeable, effectively reduces the NVH of motor.
The utility model discloses still provide an electric motor rotor simultaneously, installed above-mentioned electric motor rotor towards the piece.
In order to achieve the above purpose, the technical solution of the present invention is realized as follows:
an aspect of the utility model provides an electric motor rotor is towards piece, including towards the piece body, be close to towards the outer periphery equipartition of piece body has a plurality of magnetic pole, sets up three magnet steel groove under every magnetic pole, and every magnet steel inslot is embedded to have a magnet steel, first magnet steel groove and second magnet steel groove symmetrical arrangement, the two width direction with towards the radial slope of piece body, be the outside V font of opening, the angle of V font is not less than 100, and the third magnet steel groove is located the centre in first magnet steel groove and second magnet steel groove, the width direction perpendicular to towards the radial of piece body, be a font.
Optionally, the angle of the V-shape is 100-.
Optionally, the notch width of the third magnetic steel slot is greater than the notch widths of the first magnetic steel slot and the second magnetic steel slot.
Optionally, the notch thickness of the third magnetic steel slot is equal to the notch thickness of the first magnetic steel slot and the notch thickness of the second magnetic steel slot.
Optionally, the width of the notch of the third magnetic steel slot is 12-18mm, and the widths of the notches of the first magnetic steel slot and the second magnetic steel slot are 10.5-16.5 mm.
Optionally, the thicknesses of the notches of the first magnetic steel groove, the second magnetic steel groove and the third magnetic steel groove are 1.5-4.1 mm.
Optionally, the distance between the upper top surfaces of the first magnetic steel groove, the second magnetic steel groove and the third magnetic steel groove to the outer circumferential edge of the punching sheet body is 0.7-4 mm.
Optionally, the closest distance between the first magnetic steel groove and the second magnetic steel groove is 0.5mm-2.6 mm.
Optionally, the closest distance between the first magnetic steel groove, the second magnetic steel groove and the third magnetic steel groove is 0.5-4 mm.
Optionally, the distance between the bottom of the included angle formed by the first magnetic steel groove and the second magnetic steel groove in the shape of the V and the center of the punching sheet body is 30-40 mm.
Optionally, 8 magnetic poles are arranged on the punching sheet body, and the angle of the V-shape is 110 °.
Optionally, the central part of the punching sheet body is provided with a shaft hole, and the inner circumference of the shaft hole is provided with a convex key or a key slot.
Optionally, a plurality of lightening holes are formed in the punching sheet body between the magnetic steel groove and the shaft hole, riveting holes are formed between the lightening holes, a plurality of punching sheet bodies are combined through the riveting holes to form an iron core unit in a press-fitting mode, and a plurality of iron core units form a rotor iron core in a press-fitting mode.
The utility model discloses another aspect provides an electric motor rotor, which comprises an axle, epaxial being provided with a set of more than iron core unit, the iron core unit includes more than a plurality of the electric motor rotor towards the piece.
Adopt above-mentioned structure to set up the utility model has the advantages of it is following:
the utility model discloses a rotor punching is through optimizing magnet steel overall arrangement and the polar arc coefficient in the rotor punching for the distortion rate in the no-load air gap magnetic field of motor is showing and is descending, improves the sine degree in air gap magnetic field between stator, rotor. The peak electromagnetic force of the motor on the resonance point of the whole machine is reduced compared with the existing scheme, and finally the NVH of the motor is reduced. Meanwhile, the distortion rate and the torque ripple of the counter electromotive force of the motor are optimized to different degrees compared with the prior art.
The utility model discloses an electric motor rotor can form the magnetic field of high sine degree in the air gap of motor stator, rotor, under the excellent condition of motor output performance guaranteeing, reduces the electromagnetic force of motor during operation, and then can realize obviously just effectively reducing the NVH of motor at full rotational speed section within range, promotes the comfort level of taking of whole car.
Drawings
Fig. 1 is a front view of a motor rotor punching sheet in embodiment 1 of the present invention;
fig. 2 is a perspective view of a motor rotor sheet in embodiment 1 of the present invention;
fig. 3 is a perspective view of an iron core unit laminated by punching sheets of a motor rotor in embodiment 1 of the present invention;
fig. 4 is a dimension diagram of a motor rotor punching sheet in embodiment 1 of the present invention;
FIG. 5 is an enlarged view of section I of FIG. 4;
FIG. 6 is an enlarged view of section II of FIG. 4;
fig. 7 is a perspective view of the middle shaft in embodiment 2 of the present invention;
fig. 8 is a perspective view of a motor rotor according to embodiment 2 of the present invention;
fig. 9 is a perspective view of a motor rotor according to embodiment 2 of the present invention;
fig. 10 is a perspective view of a motor rotor according to embodiment 2 of the present invention.
In the figure: 20. punching a sheet body; 21. a magnetic steel groove; 211. a first magnetic steel slot; 212. a second magnetic steel slot; 213. a third magnetic steel groove; 22. lightening holes; 23. a shaft hole; 24. riveting holes; 25. a convex key; 30. a shaft; 301. a keyway; 302. a keyway; 31. an iron core unit.
Detailed Description
In the prior art, the torque density and the power density of a motor are higher, so that the load of the motor is high, the working state is worse, and NVH is inevitably deteriorated. The utility model provides an electric motor rotor is towards piece can make the distortion rate in the empty load air gap magnetic field of motor descend, has improved the sine degree in air gap magnetic field between stator, rotor, finally makes under the prerequisite that the motor performance keeps unchangeable, effectively reduces the NVH of motor.
In order to make the objects, technical solutions and advantages of the present invention clearer, embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.
Example 1
As shown in fig. 1 and fig. 2, the utility model provides an embodiment 1 provides a motor rotor punching sheet in this embodiment, including towards piece body 20, be close to the outer periphery equipartition towards piece body 20 and have a plurality of magnetic pole, set up three magnet steel groove 21 under every magnetic pole, every magnet steel groove 21 is embedded to have a magnet steel, first magnet steel groove 211 and second magnet steel groove 212 symmetrical arrangement, the two width direction and the radial slope towards piece body 20 are the outside V font of opening, the angle of V font is not less than 100, third magnet steel groove 213 is located the centre of first magnet steel groove 211 and second magnet steel groove 212, the width direction perpendicular to is towards the radial of piece body 20, be a font.
In this embodiment, 8 magnetic poles are uniformly distributed on the outer circumference of the punching sheet body 20. Accordingly, the motor employs an 8-pole 48-slot pole-slot fit, i.e., the rotor is 8 poles and the stator is 48 slots, so 8 steps, 24 steps, 48 steps, 96 steps, etc. are the primary orders of NVH for this motor.
The angle of the V-shape between the first magnetic steel slot 211 and the second magnetic steel slot 212, i.e. the angle ⑦ in fig. 5, affects the coefficient of the actual air gap field distribution in a range of pole pitch, i.e. the pole arc coefficient, and the angle of the V-shape is 100-.
The width of the notch of the third magnetic steel slot 213 is greater than the width of the notches of the first magnetic steel slot 211 and the second magnetic steel slot 212, the width of the notch of the third magnetic steel slot 213 is ⑧ in fig. 5, and the width of the notch of the first magnetic steel slot 211 and the width of the notch of the second magnetic steel slot 212 is ⑥ in fig. 5.
Preferably, the notch width of the third magnetic steel slot 213 is 12-18mm, and the notch widths of the first magnetic steel slot 211 and the second magnetic steel slot 212 are 10.5-16.5 mm.
The notch thickness of the third magnetic steel slot 213 is equal to the notch thickness of the first magnetic steel slot 211 and the second magnetic steel slot 212 the notch thickness of the third magnetic steel slot 213 is dimension ⑩ in FIG. 5 and the notch thickness of the first magnetic steel slot 211 and the second magnetic steel slot 212 is dimension 5
Preferably, the notch thicknesses of the first magnetic steel notch 211, the second magnetic steel notch 212 and the third magnetic steel notch 213 are 1.5-4.1 mm.
Preferably, the distance between the upper top surfaces of the first magnetic steel groove 211, the second magnetic steel groove 212 and the third magnetic steel groove 213 to the outer circumferential edge of the punching sheet body 20 is 0.7-4mm, that is, the dimension ④ in fig. 4, and due to the fact that the rotor needs to rotate at a high speed when the motor operates, the magnetic steel can be prevented from damaging the punching sheet body 20 under the action of centrifugal force due to the design.
Preferably, the closest distance between first magnetic steel slot 211 and second magnetic steel slot 212 is 0.5mm-2.6mm, dimension ⑨ in fig. 5.
Preferably, the closest distance between the first magnetic steel slot 211, the second magnetic steel slot 212 and the third magnetic steel slot 213 is 0.5-4mm, dimension ② in fig. 4.
Preferably, the distance between the bottom of the included angle formed by the first magnetic steel groove 211 and the second magnetic steel groove 212 in the shape of the V and the center of the punching sheet body 20 is 30-40 mm. I.e. the dimensions in fig. 5
The punching sheet body 20 is provided with 8 magnetic poles, and preferably, the angle of the V-shape is 110 °.
The central part of the punching sheet body 20 is provided with a shaft hole 23, and the inner circumference of the shaft hole 23 is provided with a convex key 25 or a key groove.
A plurality of lightening holes 22 are formed between the magnetic steel grooves and the shaft hole 23 on the punching sheet body 20, riveting holes 24 are formed between the lightening holes 22, a plurality of punching sheet bodies 20 are combined through the riveting holes 24 to be pressed to form iron core units 31, and a plurality of iron core units 31 are pressed to form a rotor iron core.
The shaft 30 is correspondingly provided with a key slot or a convex key to fix the iron core unit 31 formed by the punching sheet body 20. As shown in fig. 7, the shaft 30 is correspondingly provided with key slots 301 and 302.
Preferably, the distance between the bottom of the riveting hole 24 and the center of the punching sheet body 20 is 28-32mm, namely dimension ① in fig. 4, the width of the riveting hole 24 is 0.5-1.5mm, namely dimension in fig. 6
The length of the riveting hole 24 is 3-5mm, the dimension in figure 6
Preferably, the distance between the lightening holes 22 and the V-shaped magnetic steel slots is 5-8mm, namely the size in figure 6
The distance between the lightening holes 22 is 2-6mm, the dimension in figure 6
The distance between the bottom of the lightening hole 22 and the shaft hole is 2-7mm, namely a dimension ③ in figure 4.
Preferably, the diameter of the outer circle of the punching sheet body 20 is 95-105mm, namely a dimension ⑤ in fig. 4.
Example 2
As shown in fig. 7 and 8, the present embodiment provides a motor rotor, which includes a shaft 30, where the shaft 30 is provided with more than one group of iron core units 31, and each iron core unit 31 includes a plurality of motor rotor punching sheets as described in embodiment 1 above.
Selecting a fixed number of the motor rotor punching sheets, laminating the motor rotor punching sheets to form an iron core unit perpendicular to the plane of the punching sheets, wherein each iron core unit comprises a convex key 25 formed by laminating the rotor punching sheets with positioning keys. On the iron core unit 31, each V-shaped magnetic steel groove and the linear magnetic steel groove above the V-shaped magnetic steel groove form a group of magnetic steel grooves, and magnetic steel with the same magnetic pole property is arranged in each group of magnetic steel grooves; in the circumferential direction of the whole iron core, the N magnetic poles and the S magnetic poles are alternately and uniformly distributed as seen clockwise or counterclockwise, and the magnetic steel is inserted into the iron core unit 31, so that the rotor iron core with the magnetic steel inside is formed. In order to reduce the heating of the magnetic steel caused by the eddy current effect during the operation of the motor, the magnetic steel in each iron core unit 31 is divided into m sections in the axial direction, wherein m is an integer greater than or equal to 1.
Different numbers of key grooves corresponding to the convex keys 25 of the core unit 31 are arranged on the shaft 30, and a resolver groove for mounting a resolver (hereinafter referred to as resolver) is opened at one end of the shaft 30. When assembled, the end of the shaft with the rotationally-varying slot faces itself. The central line of one of the key grooves coincides with the central line of the rotary variable groove, and hereinafter, the number of the groove is 0, and the groove is counted clockwise and sequentially comprises 1 groove, 2 grooves and 3 grooves … ….
Other ways of defining the 0 slot may also be used.
The angle between the center line of the 0 slot and the left and right slots adjacent to the 0 slot is 90-360 x 2/(Z x n), wherein Z is the number of slots of the stator core; n is the number of oblique pole segments and is 4 or 6.
When assembling the direct pole rotor, all the core units 31 are directly press-fitted to the shaft 30 in the corresponding relationship of the convex keys 25 and the 0-slot. Eventually forming a straight pole rotor assembly as in fig. 8.
When n is 4, the four core units 31 are press-fitted to the shaft in this order: pressing the first section of the iron core unit onto the shaft 30 according to the corresponding relation between the convex key 25 and the 0 slot; pressing the second section of the iron core unit onto the shaft 30 according to the corresponding relation between the convex key 25 and the 1 slot; pressing the third section of iron core unit onto the shaft 30 according to the corresponding relation between the convex key 25 and the 1 slot; the fourth segment of core units are press-fitted onto the shaft 30 in accordance with the corresponding relationship of the tab 25 and the 0 slot. Finally, the skewed pole rotor assembly of FIG. 9 is formed.
When n is 6, six core units are press-fitted to the shaft 30 in this order: the first section of the iron core unit corresponds to the slots 3 according to the convex keys 25; the second section of the iron core unit corresponds to the 0 slot according to the convex key 25; the third section of iron core unit corresponds to the 1 slot according to the convex key 25; the fourth section of the iron core unit corresponds to the 1 slot according to the convex key 25; the fifth section of iron core unit corresponds to the 0 slot according to the convex key 25; the sixth section of core unit is aligned according to the convex keys 25 and 3 slots. The 2 grooves are positioned opposite to the 0 groove, and the central lines are superposed. Finally, a six-segment oblique-pole rotor assembly as shown in FIG. 6 is formed.
Preferably, a four-stage skewed rotor assembly, i.e., n-4.
In the design stage, the distortion rate of the no-load air gap magnetic field is reduced from the original 32% to the current 27% by optimizing the magnetic steel layout and the pole arc coefficient in the rotor punching sheet, and the sine degree of the air gap magnetic field between the stator and the rotor is improved. Therefore, the scheme of the motor rotor punching sheet can reduce the peak electromagnetic force of the motor on the resonance point of the whole machine by about 50%, and the air gap magnetic field tends to be distributed in a sine shape by combining four sections of oblique poles, so that the NVH of the motor is reduced finally. Meanwhile, the distortion rate and the torque ripple of the counter electromotive force of the motor are optimized to different degrees compared with the prior art. Verified by the measured data, the NVH test result of the motor in this embodiment is as follows:
24 order radial and axial noise: in the full speed range of 0-13000rpm, the noise reduction amplitude is 3-8dBA, and no noise point exists.
48-order radial noise, the noise reduction effect is obvious: the full rotation speed section of 0-13000rpm does not have any noise point, the peak value is reduced from the original 96.2dBA to the current 92dBA, and the reduction amplitude is 4.2 dBA; the radial noise of the medium and low speed section of 0-8000rpm is greatly reduced, and the drop amplitude is 5-17dBA, so that the motor has good NVH performance in the medium and low speed section of the automobile which usually works.
48-order axial noise, the noise reduction effect is obvious: the full speed segment of 0-13000rpm has no noise point, the peak value is reduced from 93.2dBA to 88dBA, and the reduction amplitude is 5.2 dBA. The axial noise of the middle and low speed section of 0-8000rpm is greatly reduced, and the descending amplitude is 5-14 dBA.
In the 96-order radial and axial noise, in the 0-13000rpm full rotating speed section, except that the individual point reduced amplitude is about 3dBA, the noise reduced amplitude of other rotating speed sections of more than 95 percent is 8-20dBA, and the noise reduction effect is obvious.
Compared with the prior scheme adopting the rotor assembly, the original motor scheme has small sound pressure level and is not compared with the prior scheme adopting the rotor assembly.
The structure of the motor rotor punching sheet in the embodiment 2 is the same as that in the embodiment 1, and the description is not repeated here.
In the above, only the embodiments of the present invention are shown, and other modifications and variations can be made by those skilled in the art based on the above-described embodiments in light of the above teachings. It should be understood by those skilled in the art that the foregoing detailed description is for the purpose of better explaining the present invention, and the scope of the present invention should be determined by the scope of the claims.
Claims (9)
1. The utility model provides a motor rotor punching, includes towards the piece body, is close to the outer periphery equipartition towards the piece body has a plurality of magnetic pole, its characterized in that sets up three magnet steel groove under every magnetic pole, and every magnet steel inslot has an embedded magnet steel, first magnet steel groove and second magnet steel groove symmetrical arrangement, the two width direction with towards the radial slope of piece body, be the outside V font of opening, the angle of V font is 100 and adds one's meal 130, and the third magnet steel groove is located the centre in first magnet steel groove and second magnet steel groove, the width direction perpendicular to it is a font to be radial towards the piece body.
2. The motor rotor punching sheet according to claim 1, wherein the notch width of the third magnetic steel groove is greater than the notch widths of the first magnetic steel groove and the second magnetic steel groove;
the thickness of the notch of the third magnetic steel groove is equal to the thickness of the notches of the first magnetic steel groove and the second magnetic steel groove.
3. The motor rotor punching sheet according to claim 2, wherein the notch width of the third magnetic steel groove is 12-18mm, and the notch widths of the first magnetic steel groove and the second magnetic steel groove are 10.5-16.5 mm;
the thickness of the notches of the first magnetic steel groove, the second magnetic steel groove and the third magnetic steel groove is 1.5-4.1 mm.
4. The motor rotor punching sheet according to claim 1, wherein the distance between the upper top surfaces of the first magnetic steel groove, the second magnetic steel groove and the third magnetic steel groove to the outer circumferential edge of the punching sheet body is 0.7-4 mm.
5. The motor rotor punching sheet according to claim 1, wherein the closest distance between the first magnetic steel groove and the second magnetic steel groove is 0.5mm-2.6 mm;
the nearest distance between the first magnetic steel groove, the second magnetic steel groove and the third magnetic steel groove is 0.5-4 mm.
6. The motor rotor punching sheet according to claim 1, wherein the distance between the bottom of the included angle formed by the first magnetic steel groove and the second magnetic steel groove in the V shape and the center of the punching sheet body is 30-40 mm.
7. The electric machine rotor punching sheet of claim 1, wherein 8 magnetic poles are arranged on the punching sheet body, and the angle of the V-shape is 110 °.
8. The motor rotor punching sheet according to claim 1, wherein a shaft hole is formed in the center of the punching sheet body, and a convex key or a key groove is formed in the inner circumference of the shaft hole;
the rotor core punching sheet is characterized in that a plurality of lightening holes are formed in the punching sheet body between the magnetic steel grooves and the shaft hole, riveting holes are formed between the lightening holes, a plurality of punching sheet bodies are combined through the riveting holes to form iron core units in a press-fitting mode, and a plurality of iron core units form a rotor core in a press-fitting mode.
9. A motor rotor comprises a shaft, wherein more than one group of iron core units are arranged on the shaft, and the motor rotor is characterized in that the iron core units comprise a plurality of motor rotor punching sheets as claimed in any one of claims 1 to 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921100008.XU CN210608722U (en) | 2019-07-12 | 2019-07-12 | Motor rotor punching sheet and motor rotor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921100008.XU CN210608722U (en) | 2019-07-12 | 2019-07-12 | Motor rotor punching sheet and motor rotor |
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| Publication Number | Publication Date |
|---|---|
| CN210608722U true CN210608722U (en) | 2020-05-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921100008.XU Active CN210608722U (en) | 2019-07-12 | 2019-07-12 | Motor rotor punching sheet and motor rotor |
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| CN (1) | CN210608722U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110277849A (en) * | 2019-07-12 | 2019-09-24 | 精进电动科技股份有限公司 | A kind of motor rotor punching sheet and rotor |
| CN112600325A (en) * | 2020-12-10 | 2021-04-02 | 苏州汇川技术有限公司 | Motor direct-pole rotor and permanent magnet synchronous motor |
-
2019
- 2019-07-12 CN CN201921100008.XU patent/CN210608722U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110277849A (en) * | 2019-07-12 | 2019-09-24 | 精进电动科技股份有限公司 | A kind of motor rotor punching sheet and rotor |
| CN112600325A (en) * | 2020-12-10 | 2021-04-02 | 苏州汇川技术有限公司 | Motor direct-pole rotor and permanent magnet synchronous motor |
| CN112600325B (en) * | 2020-12-10 | 2022-06-28 | 苏州汇川技术有限公司 | Motor direct-pole rotor and permanent magnet synchronous motor |
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