CN210123912U

CN210123912U - Rotor punching structure, stator punching and motor structure

Info

Publication number: CN210123912U
Application number: CN201920715859.9U
Authority: CN
Inventors: 王伟钢; 孔庆波; 吴发亮; 张水杏; 齐洪刚
Original assignee: Guangzhou Xiaopeng Motors Technology Co Ltd
Current assignee: Guangzhou Xiaopeng Motors Technology Co Ltd
Priority date: 2019-05-16
Filing date: 2019-05-16
Publication date: 2020-03-03
Anticipated expiration: 2029-05-16

Abstract

The utility model discloses a rotor punching sheet structure, stator punching sheet and motor structure, rotor punching sheet structure include the rotor punching sheet, be equipped with centre bore and 6 group's magnet steel on the rotor punching sheet, 6 group's magnet steel evenly distributed are in around the centre bore, the magnetic pole of 6 group's magnet steel is along the circumference of rotor punching sheet alternately distributed, every group magnet steel all includes first magnet steel, second magnet steel and third magnet steel, first magnet steel is on a parallel with the tangential setting of rotor punching sheet, second magnet steel and third magnet steel symmetric distribution are in the both sides of first magnet steel, the second magnet steel is the V font of opening to the rotor punching sheet outside with the third magnet steel and arranges, all be equipped with the notch in the rotor punching sheet outer fringe that every group magnet steel corresponds. Stator slots are arranged on the stator punching sheet, and the stator slots are uniformly distributed on the inner edge of the stator punching sheet and form 54 stator teeth. Motor structure include stator towards piece and above arbitrary technical scheme rotor towards piece structure, the stator towards the piece and establish in the rotor towards the piece outside, the utility model discloses can reach efficiency and NVH win-win purpose.

Description

Rotor punching structure, stator punching and motor structure

Technical Field

The utility model is used for the driving motor field especially relates to a rotor punching structure, stator punching and motor structure.

Background

Mileage anxiety of an electric vehicle is a pain point of the electric vehicle, and improving the efficiency of a driving motor is a direction to be continuously pursued. In the permanent magnet synchronous motor for driving, a certain amount of magnetic steel is embedded in a motor rotor to generate a rotor magnetic field. The number of the magnetic steel of the motor is generally designed to be 3 pairs, 4 pairs, 5 pairs and 6 pairs. The higher the pole pair number is, the smaller the torque fluctuation is, and the smoother the motor operation is. However, the higher the pole pair number, the higher the electrical frequency, the higher the iron loss of the motor, the lower the efficiency, the higher the requirement for the controller, and the lower the maximum rotational speed at which the motor can operate. The number of pole pairs of the motor rotor is reduced, the electrical frequency can be reduced, the iron loss is reduced, and finally the efficiency of the motor can be improved. However, by reducing the pole pair number of the rotor, the torque fluctuation and the harmonic content of the motor are correspondingly increased, and the NVH (Noise, Vibration and Harshness) is deteriorated.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to solve one of the technical problem that exists among the prior art at least, provide a rotor towards piece structure, stator towards piece and motor structure, it has reduced the electrical frequency, reduces the iron loss, has improved the efficiency of motor, simultaneously, has also restrained harmonic content, and then has improved NVH, reaches efficiency and NVH win-win purpose.

The utility model provides a technical scheme that its technical problem adopted is: rotor punching structure, including the rotor punching, be equipped with centre bore and 6 groups magnet steel on the rotor punching, 6 groups magnet steel evenly distributed is in around the centre bore, 6 groups the magnetic pole of magnet steel is followed the circumference of rotor punching distributes in turn, and every group the magnet steel all includes first magnet steel, second magnet steel and third magnet steel, first magnet steel is on a parallel with the tangential setting of rotor punching, second magnet steel and third magnet steel symmetric distribution are in the both sides of first magnet steel, second magnet steel and third magnet steel are the opening to the V font of rotor punching outside is arranged, at every group all be equipped with the notch on the rotor punching outer fringe that the magnet steel corresponds.

Preferably, the V-shaped included angle formed by the second magnetic steel and the third magnetic steel is between 40 degrees and α 1 degrees and between 50 degrees.

Preferably, each group of corresponding magnetic steels on the rotor punching sheet is provided with a first magnetic steel groove, a second magnetic steel groove and a third magnetic steel groove, the first magnetic steel is connected with the first magnetic steel groove, the second magnetic steel is connected with the second magnetic steel groove, and the third magnetic steel is connected with the third magnetic steel groove.

Preferably, the rotor sheet forms a first magnetic isolation bridge between a first magnetic steel groove and the outer edge of the rotor sheet, the rotor sheet forms a second magnetic isolation bridge between a second magnetic steel groove and the outer edge of the rotor sheet, the rotor sheet forms a third magnetic isolation bridge between a third magnetic steel groove and the outer edge of the rotor sheet, the first magnetic isolation bridge is provided with a first notch and a second notch, the second magnetic isolation bridge is provided with a third notch, the third magnetic isolation bridge is provided with a fourth notch, the center of the first magnetic steel and the center line of the center hole are the center line, the first notch and the second notch are symmetrical about the center line, and the third notch and the fourth notch are symmetrical about the center line.

Preferably, the included angle between the connecting line of the center of the first notch and the center of the central hole and the connecting line of the center of the second notch and the center of the central hole is 8- α 2-20 degrees.

Preferably, the radius of the first notch is more than or equal to 3mm and less than or equal to R1 and less than or equal to 6mm, the radius of the second notch is more than or equal to 4mm and less than or equal to R2 and less than or equal to 6mm, the radius of the third notch is more than or equal to 5.5mm and less than or equal to R3 and less than or equal to 10mm, and the radius of the fourth notch is more than or equal to 5.5mm and less than or equal.

Preferably, the distance between the starting point and the end point of the first notch is more than or equal to 2mm and less than or equal to L1 and less than or equal to 4mm, the distance between the starting point and the end point of the second notch is more than or equal to 2mm and less than or equal to L2 and less than or equal to 4mm, the distance between the starting point and the end point of the third notch is more than or equal to 3mm and less than or equal to L3 and less than or equal to 6.5mm, and the distance between the starting point and the end point of the fourth.

Preferably, the minimum distance between two adjacent groups of magnetic steels is 9 mm-L5-15 mm.

Preferably, a window is arranged between the second magnetic steel and the third magnetic steel on the rotor punching sheet.

Preferably, the shortest distance between the edge of the window and the central hole is not less than 4mm and not more than H1 and not more than 9mm, and the shortest distance between the inner edge of the window and the outer edge of the window along the radial direction of the rotor sheet is not less than H2 and not more than 7 mm.

The stator punching sheet is internally provided with a rotor rotating space, the stator punching sheet is provided with stator slots, and the stator slots are uniformly distributed on the inner edge of the stator punching sheet and form 54 stator teeth.

Preferably, a stator yoke is formed between the outer edge of the stator punching sheet and the stator slot, and the thickness of the stator yoke is not less than 17mm and not more than H3 and not more than 20 mm.

The motor structure comprises a stator punching sheet and the rotor punching sheet structure adopting any technical scheme, wherein the stator punching sheet is arranged on the outer side of the rotor punching sheet, stator grooves are formed in the stator punching sheet, and the stator grooves are uniformly distributed in the inner edge of the stator punching sheet and form 54 stator teeth.

One of the above technical solutions has at least one of the following advantages or beneficial effects: 6 group the magnet steel forms 3 pairs of poles, and for 4 pairs of poles and above technical scheme, it has reduced electric frequency, has reduced the iron loss, raises the efficiency. The number of pole pairs is reduced, the interval between 2 pairs of magnetic poles can be increased, the Q-axis inductance is improved, and the speed regulation range is enlarged. Meanwhile, the notches are formed in the outer edge of the rotor, so that torque pulsation and electromagnetic force can be reduced, and the purpose of improving NVH is achieved.

Drawings

The present invention will be further explained with reference to the accompanying drawings:

fig. 1 is a schematic structural diagram of an embodiment of a structure of a rotor sheet in the present invention;

FIG. 2 is a schematic view of a set of magnetic steels on a rotor plate of the embodiment shown in FIG. 1;

FIG. 3 is another schematic view of a set of magnetic steels on a rotor plate of the embodiment shown in FIG. 1;

fig. 4 is a schematic structural diagram of an embodiment of the motor structure of the present invention;

FIG. 5 is a partial schematic structural view of one embodiment shown in FIG. 4;

fig. 6 is a schematic diagram comparing the operation noise of the embodiment shown in fig. 4 with the conventional motors 1, 2 and 3.

Detailed Description

This section will describe in detail the embodiments of the present invention, preferred embodiments of the present invention are shown in the attached drawings, which are used to supplement the description of the text part of the specification with figures, so that one can intuitively and vividly understand each technical feature and the whole technical solution of the present invention, but they cannot be understood as the limitation of the protection scope of the present invention.

In the present invention, if there is a description of directions (up, down, left, right, front and back), it is only for convenience of description of the technical solution of the present invention, and it is not intended to indicate or imply that the technical features indicated must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.

In the present invention, "a plurality" means one or more, "a plurality" means two or more, "more than", "less than", "more than", and the like, which means that the number is not included; the terms "above", "below", "within" and the like are to be understood as including the number. In the description of the present invention, if there is any description of "first" and "second" only for the purpose of distinguishing technical features, it is not to be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the precedence of the indicated technical features.

In the present invention, unless otherwise explicitly defined, the terms "set," "mounted," "connected," and the like are to be understood in a broad sense, and may be directly connected or indirectly connected through an intermediate medium, for example; can be fixedly connected, can also be detachably connected and can also be integrally formed; may be mechanically coupled, may be electrically coupled or may be capable of communicating with each other; either as communication within the two elements or as an interactive relationship of the two elements. The technical skill in the art can reasonably determine the specific meaning of the above words in the present invention by combining the specific contents of the technical solution.

Referring to fig. 1 and 2, an embodiment of the present invention provides a rotor sheet structure, including a rotor sheet 1, the rotor punching sheet 1 is provided with a central hole 11 and 6 groups of magnetic steels, the central hole 11 is used for being connected with a central shaft of a rotor, the 6 groups of magnetic steels are uniformly distributed around the central hole 11, magnetic poles of the 6 groups of magnetic steels are alternately distributed along the circumferential direction of the rotor punching sheet 1 to form 3 pairs of poles, each group of magnetic steels comprises a first magnetic steel 12, a second magnetic steel 13 and a third magnetic steel 14, the first magnetic steel 12 is arranged parallel to the tangential direction of the rotor punching sheet 1, the second magnetic steel 13 and the third magnetic steel 14 are symmetrically distributed on two sides of the first magnetic steel 12, the second magnetic steel 13 and the third magnetic steel 14 are arranged in a V shape with openings towards the outer side of the rotor punching sheet 1, and notches are formed in the outer edge of the rotor punching sheet 1 corresponding to each group of magnetic steels.

6 group the magnet steel forms 3 pairs of poles, and for 4 pairs of poles and above technical scheme, it has reduced electric frequency, has reduced the iron loss, raises the efficiency. The number of pole pairs is reduced, the interval between 2 pairs of magnetic poles is increased, the Q-axis inductance is improved, and the speed regulation range is enlarged. Meanwhile, the notches are formed in the outer edge of the rotor, so that torque pulsation and electromagnetic force can be reduced, and the purpose of improving NVH is achieved. The embodiment can effectively reduce and improve torque fluctuation and inhibit harmonic content by reasonably designing the position of the magnetic steel, the angle of the magnetic steel, the notch of the rotor and the like, thereby improving NVH and achieving the win-win purpose of efficiency and NVH.

Referring to fig. 2, a V-shaped included angle formed by the second magnetic steel 13 and the third magnetic steel 14 is greater than or equal to 40 degrees and less than or equal to α 1 degrees and less than or equal to 50 degrees, the second magnetic steel 13 and the third magnetic steel 14 adopt a deep V design, so that the area between V shapes is increased, the magnetic saturation is reduced, and the efficiency is improved, see table 1, and the NEDC efficiency of the motor applying the embodiment is improved remarkably through actual measurement of a prototype.

TABLE 1 NEDC typical operating Point efficiency comparison

The magnetic steels are assembled or bonded with the rotor punching sheet 1, preferably, referring to fig. 2, each group of the rotor punching sheet 1 corresponding to the magnetic steels is provided with a first magnetic steel groove 15, a second magnetic steel groove 16 and a third magnetic steel groove 17, the first magnetic steel 12 is connected with the first magnetic steel groove 15, the second magnetic steel 13 is connected with the second magnetic steel groove 16, and the third magnetic steel 14 is connected with the third magnetic steel groove 17. The magnetic steel realizes the connection on the rotor punching sheet 1 through the magnetic steel groove, the structure is more stable, and the installation precision is higher.

Referring to fig. 3, a first magnetic isolation bridge 18 is formed between a first magnetic steel groove 15 and the outer edge of a rotor sheet 1 of the rotor sheet 1, a second magnetic isolation bridge 19 is formed between a second magnetic steel groove 16 and the outer edge of the rotor sheet 1, a third magnetic isolation bridge 110 is formed between a third magnetic steel groove 17 and the outer edge of the rotor sheet 1 of the rotor sheet, the magnetic isolation bridge is formed directly through the material of the rotor sheet 1 after the magnetic steel groove is formed, a first notch 111 and a second notch 112 are arranged on the first magnetic steel groove 110, a fourth notch 114 is arranged on the third magnetic isolation bridge 110, a central line between the center of the first magnetic steel 12 and the center hole 11 is a center line, the first notch 111 and the second notch 112 are symmetrical with respect to the center line, the first notch 113 and the third notch 113 and the fourth notch 114 are symmetrical with respect to the center line, the third notch 113 and the third notch 113 notch and the fourth notch 114 are symmetrical with respect to the center line, torque of the center line, the center notch 111, the center notch 112 and the center notch 112, the center notch is equal to the center notch, the center notch 112, the center notch under the torque of the low torque of the motor sheet 1 notch 111, the motor is equal to the motor, the.

Referring to fig. 1, the minimum distance L5 between two adjacent groups of magnetic steels affects the q-axis inductance of the motor, and for the design of the motor, preferably, the minimum distance L5 between two adjacent groups of magnetic steels is no less than 9mm and no more than 15mm, so that the magnetic saturation is reduced, and the efficiency is improved, see table 1, and through actual measurement of a prototype, the NEDC efficiency of the motor using the embodiment is improved remarkably.

Referring to fig. 3, a window 115 is disposed between the second magnetic steel 13 and the third magnetic steel 14 on the rotor punching sheet 1. The window 115 may reduce magnetic saturation and improve efficiency. The specific position and size of the window 115 can affect the magnetic circuit of the motor, and for the design of the motor, the effect is better as shown in fig. 3, the shortest distance 4mm from the edge of the window 115 to the central hole 11 is not less than H1 and not more than 9mm, and the shortest distance 4mm from the inner edge of the window 115 to the outer edge of the window 115 along the radial direction of the rotor sheet 1 is not less than H2 and not more than 7mm, so that the efficiency is improved while the magnetic leakage is prevented. Referring to table 1, the NEDC efficiency of the motor using the present embodiment is significantly improved by prototype measurement.

Referring to fig. 1, between two sets of magnetic steels, lightening holes 116 may be opened, and the shape of the lightening holes 116 may be circular, peach-shaped, heart-shaped, etc.

The embodiment of the utility model provides a stator punching sheet is still provided, refer to fig. 4, stator punching sheet 2 can adopt integrated into one piece or adopt a plurality of stators to form towards 2 units of piece mutually supporting, matched stack, concatenation, stator punching sheet 2 is inside to be injectd the rotor and rotates the space for with rotor punching sheet structural coordination, stator punching sheet 2 is last to be equipped with stator slot 21, stator slot 21 is at stator punching sheet 2 inner edge evenly distributed and form 54 stator teeth 22. Through the embodiment of the utility model provides a stator punching sheet 2, the cooperation is aforementioned the embodiment of the utility model provides a rotor punching sheet structure is verified through the experiment and is found, because 54 stator teeth 22 can reduce the harmonic content of back emf to restrain the torque ripple, produce better noise reduction effect. In addition, through experimental discovery, the exclusive application the embodiment of the utility model provides a stator punching 2 structure also can provide certain noise reduction effect. Referring to fig. 6, through prototype actual measurement, the NVH improvement effect of the motor applying the embodiment is obvious.

Referring to fig. 5, in order to improve efficiency, a stator yoke 23 is formed at a part between the outer edge of the stator punching sheet 2 and the stator slot 21, and the thickness of the stator yoke 23 is 17mm ≤ H3 ≤ 20 mm. Referring to table 1, the actual measurement of a prototype shows that the NEDC efficiency of the motor reaches 94.8%, and the efficiency is improved by more than 0.5% compared with that of the conventional 8-pole 48-slot motor.

Referring to fig. 4, the embodiment of the present invention further provides a motor structure, including stator punching 2 and the rotor punching structure of any one of the above embodiments, stator punching 2 is established outside rotor punching 1, stator slot 21 is provided on stator punching 2, stator slot 21 is evenly distributed at inner edge of stator punching 2 and forms 54 stator teeth 22. 54 stator teeth 22 can reduce the harmonic content of the back electromotive force, so that torque pulsation is suppressed, noise reduction is realized, and referring to fig. 6, the NVH improvement effect of the motor applying the embodiment is obvious through actual measurement of a prototype. Referring to fig. 5, in order to improve efficiency, a stator yoke 23 is formed at a part between the outer edge of the stator punching sheet 2 and the stator slot 21, and the thickness of the stator yoke 23 is 17mm ≤ H3 ≤ 20 mm.

Referring to fig. 6, the total sound pressure level of electromagnetic noise of the motor is measured by a prototype, and compared with a traditional 8-pole 48-slot motor, the noise is reduced by more than 5 decibels, and the NVH improvement effect is obvious. Referring to table 1, the actual measurement of a prototype shows that the NEDC efficiency of the motor reaches 94.8%, and the efficiency is improved by more than 0.5% compared with that of the conventional 8-pole 48-slot motor.

The invention is not limited to the above embodiments, and those skilled in the art can make equivalent modifications or substitutions without departing from the spirit of the invention, and such equivalent modifications or substitutions are included in the scope defined by the claims of the present application.

Claims

1. Rotor punching structure, its characterized in that: the rotor punching sheet comprises a rotor punching sheet, wherein a central hole and 6 groups of magnetic steels are arranged on the rotor punching sheet, the 6 groups of magnetic steels are uniformly distributed around the central hole, 6 groups of magnetic poles of the magnetic steels are distributed along the circumferential direction of the rotor punching sheet in an alternating mode, each group of magnetic steels comprises a first magnetic steel, a second magnetic steel and a third magnetic steel, the first magnetic steel is parallel to the tangential direction of the rotor punching sheet, the second magnetic steel and the third magnetic steel are symmetrically distributed on two sides of the first magnetic steel, the second magnetic steel and the third magnetic steel are arranged in a V shape in the outer side of the rotor punching sheet, and notches are formed in the outer edge of the rotor punching sheet corresponding to the magnetic steels in each group.

2. The rotor punching structure according to claim 1, wherein a V-shaped included angle formed by the second magnetic steel and the third magnetic steel is greater than or equal to 40 degrees and less than or equal to α 1 degrees and less than or equal to 50 degrees.

3. The rotor sheet structure of claim 1, wherein: the rotor punching sheet is provided with a first magnetic steel groove, a second magnetic steel groove and a third magnetic steel groove corresponding to each group of magnetic steels, the first magnetic steel is connected with the first magnetic steel groove, the second magnetic steel is connected with the second magnetic steel groove, and the third magnetic steel is connected with the third magnetic steel groove.

4. The rotor sheet structure of claim 3, wherein: the rotor punching sheet forms a first magnetic isolation bridge between a first magnetic steel groove and the outer edge of the rotor punching sheet, the rotor punching sheet forms a second magnetic isolation bridge between the second magnetic steel groove and the outer edge of the rotor punching sheet, the rotor punching sheet forms a third magnetic isolation bridge between a third magnetic steel groove and the outer edge of the rotor punching sheet, a first notch and a second notch are arranged on the first magnetic isolation bridge, a third notch is arranged on the second magnetic isolation bridge, a fourth notch is arranged on the third magnetic isolation bridge, the center of the first magnetic steel and the center line of the center hole are the center line, the first notch and the second notch are symmetrical about the center line, and the third notch and the fourth notch are symmetrical about the center line.

5. The rotor punching structure of claim 4, wherein an included angle between a connecting line of the center of the first notch and the center of the center hole and a connecting line of the center of the second notch and the center of the center hole is 8- α 2 and 20 degrees.

6. The rotor sheet structure of claim 4, wherein: r1 is more than or equal to 3mm and less than or equal to 6mm in radius of the first notch, R2 is more than or equal to 4mm and less than or equal to 6mm in radius of the second notch, R3 is more than or equal to 5.5mm and less than or equal to 10mm in radius of the third notch, and R4 is more than or equal to 5.5mm and less than or equal to 10mm in radius of the fourth notch.

7. The rotor sheet structure of claim 6, wherein: the distance between the starting point and the end point of the first notch is more than or equal to 2mm and less than or equal to L1 and less than or equal to 4mm, the distance between the starting point and the end point of the second notch is more than or equal to 2mm and less than or equal to L2 and less than or equal to 4mm, the distance between the starting point and the end point of the third notch is more than or equal to 3mm and less than or equal to L3 and less than or equal to 6.5mm, and the distance between the starting point and the end point of the.

8. The rotor sheet structure of claim 1, wherein: the minimum distance L5 between two adjacent groups of magnetic steel is not less than 9mm and not more than 15 mm.

9. The rotor sheet structure of claim 1, wherein: and a window is arranged between the second magnetic steel and the third magnetic steel on the rotor punching sheet.

10. The rotor sheet structure of claim 9, wherein: the shortest distance from the edge of the window to the central hole is not less than 4mm and not more than H1 and not more than 9mm, and the shortest distance from the inner edge of the window to the outer edge of the window along the radial direction of the rotor sheet is not less than 4mm and not more than H2 and not more than 7 mm.

11. Stator punching, its characterized in that: the stator punching sheet is internally limited with a rotor rotating space, stator slots are arranged on the stator punching sheet, and the stator slots are uniformly distributed on the inner edge of the stator punching sheet and form 54 stator teeth.

12. The stator lamination of claim 11, wherein: the stator yoke is formed between the outer edge of the stator punching sheet and the stator groove, and the thickness of the stator yoke is not less than 17mm and not more than H3 and not more than 20 mm.

13. Motor structure, its characterized in that: the stator punching structure comprises a stator punching and the rotor punching structure as claimed in any one of claims 1-10, wherein the stator punching is arranged on the outer side of the rotor punching, stator slots are formed in the stator punching, and the stator slots are uniformly distributed on the inner edge of the stator punching and form 54 stator teeth.

14. The electric machine structure of claim 13, wherein: the stator yoke is formed between the outer edge of the stator punching sheet and the stator groove, and the thickness of the stator yoke is not less than 17mm and not more than H3 and not more than 20 mm.