High-power-density 8-pole 12-slot vehicle-mounted compressor motor

Abstract

The utility model discloses a high-power-density 8-pole 12-slot vehicle-mounted compressor motor, which comprises a stator, 12 tooth parts are arranged on the stator at intervals in the axial direction of the inner circle of the stator, and the adjacent tooth parts are isolated from each other; an air gap is formed between the outer circumference of the rotor and the inner circumference of the stator, eight magnet grooves are formed in the rotor in the circumferential direction at intervals, each magnet groove is provided with a first magnetic groove and a second magnetic groove, an angle is formed between the first magnetic groove and the second magnetic groove, and the first magnetic groove and the second magnetic groove are communicated at the ends, close to the center of the rotor, of the first magnetic groove and the second magnetic groove. According to the utility model, under the same performance, the size of the motor can be reduced, the light weight is realized, the production cost is further promoted to be reduced, and the design of the magnet grooves which form angles with each other improves the power density, so that the motor has better demagnetization resistance and higher reliability, and in addition, the NVH (Noise Vibration and Harshness) is better, and the competitiveness of the product is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of vehicle-mounted compressor, specifically is a kind of 8-pole 12-slot vehicle-mounted compressor motor of high power density. BACKGROUND

[0002] In recent years, under the influence of national policy and market stimulation, China has become a global new energy vehicle consumption power, electrification has become a time label, various types of motor as various execution terminal, high performance, high reliability is the goal that motor design always seeks, the 8-pole 12-slot motor of current market mainstream design, one of them is as shown in Figure 1 , rotor magnet is in a string, limited to magnet volume, so that motor power density is lower, resulting in motor volume is larger, and it is difficult to optimize the vibration noise of motor;As shown in Figure 2 , another rotor magnet design is along the diameter direction of rotor, spoke distribution, although it can improve motor power density, but rotor assembly magnetization is relatively difficult, not conducive to mass production, therefore, the 8-pole 12-slot structure in the prior art of automobile compressor technology, motor power density is low, not conducive to lightweight, and motor stator and rotor structure is relatively simple, not conducive to the optimization of vibration noise. SUMMARY

[0003] In order to overcome the defects in the prior art, the embodiments of the utility model provide a kind of 8-pole 12-slot vehicle-mounted compressor motor of high power density, it is used to solve one or more of the above problems.

[0004] The embodiments of the present application disclose: a kind of 8-pole 12-slot vehicle-mounted compressor motor of high power density, comprising: stator, 12 tooth parts are arranged at the inner circle of the stator in its axial direction, and the adjacent tooth parts are isolated from each other;Rotor, the outer periphery of the rotor and the inner periphery of the stator have air gap, and the inside of the rotor is arranged with 8 magnet slots in its circumferential direction, each of the magnet slots has a first magnetic slot and a second magnetic slot, and the first magnetic slot and the second magnetic slot are communicated at the end near the center of the rotor.

[0005] Further, the tooth part of the stator is arc-shaped in the middle, and the two sides are straight lines respectively tangent to the edge of the middle of the tooth part.

[0006] Further, the first magnetic slot and the second magnetic slot are symmetrical on the axis passing through the end connected thereto to the center of the rotor.

[0007] Further, the first magnetic slot and the second magnetic slot have a waist-round auxiliary hole therebetween, and the extension direction of the auxiliary hole is the same as the direction of the symmetry axis of the first magnetic slot and the second magnetic slot.

[0008] Further, the included angle between the first magnetic slot and the second magnetic slot is 82°-88°

[0009] Further, the width of the magnetic isolation bridge between adjacent magnetic slots is 1mm-1.4mm.

[0010] Further, the outer periphery of the rotor between adjacent magnetic slots has an outwardly protruding circular arc.

[0011] Further, the bottom of the circular arc protrusion is located on a planar protrusion extending in a direction perpendicular to the rotor axis.

[0012] The beneficial effects of the present application are as follows:

[0013] So that under the same performance, the volume of the motor can be reduced, the lightweight is realized, and the production cost is further reduced.

[0014] In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the following preferred embodiments are described in detail below, and the accompanying drawings are described as follows. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0016] Figure 1 is a structural diagram of an 8-pole 12-slot motor in the prior art;

[0017] Figure 2 is a structural diagram of another 8-pole 12-slot motor in the prior art;

[0018] Figure 3 is a structural diagram of a high-power-density 8-pole 12-slot vehicle-mounted compressor motor in the embodiment of the present application;

[0019] Figure 4 is a detail view of a high-power-density 8-pole 12-slot vehicle-mounted compressor motor in the embodiment of the present application;

[0020] Figure 5 is a structural diagram of a rotor in the embodiment of the present application;

[0021] Figure 6 Figure 3 is a structure schematic diagram of a rotor after installation of a magnet in the embodiment of the present application;

[0022] Figure 7 Figure 4 is a detail view of a stator in the embodiment of the present application;

[0023] Figures 8-12 Figure 5 is a test result diagram of a stator in the embodiment of the present application;

[0024] The reference signs of the above drawings are as follows: 1, stator; 11, tooth portion; 2, rotor; 21, magnet slot; 211, first magnet slot; 212, second magnet slot; 22, auxiliary hole; 23, magnetic isolation bridge; 24, circular arc protruding portion; 25, planar protruding portion; 3, air gap. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

[0026] As shown in Figures 3 to 7 a high-power-density 8-pole 12-slot vehicle-mounted compressor motor, comprising:

[0027] A stator 1, the stator 1 is provided with 12 tooth portions 11 in the axial direction of its inner circle, the adjacent tooth portions 11 are isolated from each other, each tooth portion 11 is used for winding to form a winding, so that the 12 tooth portions 11 form a 12-slot structure after winding. Preferably, the tooth portion 11 of the stator 1 is circular arc-shaped in the middle and linear on both sides, which are tangent to the edges of the middle of the tooth portion 11.

[0028] A rotor 2 has an air gap 3 between its outer periphery and the inner periphery of the stator 1, which provides space for the relative rotation between the stator 1 and the rotor 2, thereby avoiding interference between the stator 1 and the rotor 2. The inside of the rotor 2 is provided with eight magnet grooves 21 in the circumferential direction, which are used to arrange rotor 2 magnets to form an eight-pole structure. Each of the magnet grooves 21 has a first magnetic groove 211 and a second magnetic groove 212 that are at an angle to each other, so that the first magnetic groove 211 and the second magnetic groove 212 form a structure similar to a "V" shape. The first magnetic groove 211 and the second magnetic groove 212 are used to arrange S-pole magnets and N-pole magnets, respectively, so that the S-pole magnets and N-pole magnets are evenly arranged along the circumferential direction of the rotor 2. The first magnetic groove 211 and the second magnetic groove 212 are connected at their ends near the center of the rotor 2, so that in each of the magnet grooves 21, the first magnetic groove 211 and the second magnetic groove 212 are connected through their respective ends, and between adjacent first magnetic grooves 211 and second magnetic grooves 212 in adjacent magnet grooves 21, a magnetic separation bridge 23 is formed to separate adjacent magnet grooves 21. The outer periphery of the rotor 2 between adjacent magnet grooves 21 can have an outwardly protruding circular arc portion 24. Preferably, the bottom of the circular arc portion 24 is located on a planar protrusion 25 that extends in a direction perpendicular to the axis of the rotor 2.

[0029] In this embodiment, the stator 1 is provided with a concentrated winding, and the winding is a single-stator 1 tooth winding structure. The tooth flat-cut portion accounts for 0.16 of the entire tooth arc, and is distributed at both ends of the stator 1 tooth. The angle between the tooth flat-cut portion and the center axis of the stator 1 tooth is 86 degrees. The magnets are distributed with N-pole magnets and S-pole magnets, which are arranged along the inside of the rotor 2 and are spaced apart. One N-pole magnet and one S-pole magnet form a "V"-shaped structure, thereby forming an 8-pole 12-slot structure with a larger magnet groove 21 area, which is beneficial to improve the power density of the motor and facilitate the small size and light weight of the product. By optimizing the structure of the stator 1 and the rotor 2 in the motor, the tooth slot torque and torque fluctuation of the motor during use are effectively reduced, the vibration and noise of the motor are reduced, and the competitiveness of the product is improved.

[0030] The above structure can reduce the size of the motor under the same performance, achieve lightweight, and further reduce production costs. The design of the magnet grooves 21 at an angle improves the power density, has better anti-demagnetization ability, higher reliability, better NVH, and improved product competitiveness.

[0031] Specifically, the first magnetic slot 211 and the second magnetic slot 212 are symmetrical on the axis passing through the connected end to the center of the rotor 2. Thus, the first magnetic slot 211 and the second magnetic slot 212 in different magnetic slots 21 can be uniformly distributed in the circumferential direction of the rotor 2, and the distribution of the magnets on the entire rotor 2 is more uniform after the S-pole magnet and the N-pole magnet are arranged in the first magnetic slot 211 and the second magnetic slot 212, respectively.

[0032] Specifically, the first magnetic slot 211 and the second magnetic slot 212 have a waist-round auxiliary hole 22 therebetween, the extension direction of the auxiliary hole 22 is the same as the direction of the symmetry axis of the first magnetic slot 211 and the second magnetic slot 212, and the auxiliary hole 22 is used to increase the magnetic flux of the rotor 2 after the S-pole magnet and the N-pole magnet are arranged in the first magnetic slot 211 and the second magnetic slot 212, respectively, so as to improve the reliability of the rotor 2.

[0033] Specifically, the included angle between the first magnetic slot 211 and the second magnetic slot 212 is 82°-88°, and in this angle range, the length of the first magnetic slot 211 and the second magnetic slot 212 can be ensured to be large, thereby increasing the power density of the motor. It is worth noting that the optimal included angle of the first magnetic slot 211 and the second magnetic slot 212 is 86° according to repeated experiments of the inventor.

[0034] Specifically, the width of the magnetic isolation bridge 23 between adjacent magnetic slots 21 is 1mm-1.4mm, and the height of the magnetic isolation bridge 23 is 0.6mm-1mm. In this range, the blocking leakage magnetic effect can be met, and the mechanical strength of the rotor 2 during rotation can be met.

[0035] In the case that the size of the stator 1 and the rotor 2 is the same, the inventor compares the embodiment of the application with the prior art scheme and performs the following experiments:

[0036] Motor no-load back electromotive force experiment, as shown in Figure 8 As described above, the motor no-load back electromotive force EMF waveform of the embodiment of the new scheme is more sinusoidal than that of the prior art scheme, which facilitates the driving control of the motor.

[0037] Back electromotive force harmonic test, as shown in Figure 9 The back electromotive force harmonic amplitude of the embodiment of the new scheme is reduced, and the harmonic ratio is reduced, wherein the THD of the prior art scheme is 9.94%, the THD of the embodiment of the application is 4.48%, and the harmonic ratio is reduced by 54.9%.

[0038] Cogging torque test, as shown in Figure 10As shown, the application embodiment in the new scheme can effectively reduce the cogging torque of the motor compared with the existing scheme, thereby improving the user experience, and the cogging torque is reduced by 91%.

[0039] Rated output torque test, such as Figure 11 As shown, the application embodiment in the new scheme can effectively reduce the torque fluctuation of the motor compared with the existing scheme, thereby improving the smoothness of the motor operation, the torque fluctuation of the existing scheme is 17.52%, the torque fluctuation of the new scheme is 8.25%, and the torque fluctuation is reduced by 52.9%.

[0040] Radial force density test, Figure 12 As shown, the application embodiment in the new scheme can effectively reduce the radial force of the motor compared with the existing scheme, thereby reducing the vibration and noise of the motor.

[0041] The principle and implementation mode of the application are described by applying the specific embodiments in the utility model, and the above embodiment is only used for helping to understand the method and core idea of the utility model; meanwhile, for the general skilled person in the art, according to the idea of the utility model, the specific implementation mode and application range will be changed, and the above is not understood as the limitation of the utility model.

Claims

1. A high power density 8-pole 12-slot on-board compressor motor characterized in that, Comprise: A stator, 12 teeth are arranged in the axial direction of the inner circle of the stator, the adjacent teeth are isolated from each other; A rotor, the outer periphery of the rotor and the inner periphery of the stator have an air gap, the inside of the rotor is arranged with 8 magnet slots in the circumferential direction, each of the magnet slots has a first magnetic slot and a second magnetic slot which are at an angle, the first magnetic slot and the second magnetic slot are communicated at the end near the center of the rotor.

2. A high power density 8-pole 12-slot in-vehicle compressor motor as claimed in claim 1, wherein, The tooth of the stator is arc-shaped in the middle, and the two sides are straight lines tangent to the edges of the middle of the tooth.

3. A high power density 8-pole 12-slot vehicular compressor motor as claimed in claim 1, wherein, The first magnetic slot and the second magnetic slot are symmetrical on the axis passing through the connected end to the center of the rotor.

4. A high power density 8-pole 12-slot in-vehicle compressor motor as claimed in claim 3, wherein, The first magnetic slot and the second magnetic slot have a waist-shaped auxiliary hole between them, and the extension direction of the auxiliary hole is the same as the direction of the symmetry axis of the first magnetic slot and the second magnetic slot.

5. A high power density 8-pole 12-slot vehicular compressor motor as claimed in claim 1, wherein, The included angle between the first magnetic slot and the second magnetic slot is 82°-88°.

6. A high power density 8-pole 12-slot vehicular compressor motor as claimed in claim 1, wherein, The width of the magnetic bridge between adjacent magnetic slots is 1mm-1.4mm.

7. A high power density 8-pole 12-slot vehicular compressor motor as claimed in claim 1, wherein, The outer periphery of the rotor between adjacent magnetic slots has an outward arc protrusion.

8. A high power density 8-pole 12-slot on-board compressor motor as claimed in claim 7, characterized in that, The bottom of the arc protrusion is located on a planar protrusion extending in the plane, and the planar protrusion extends in a direction perpendicular to the rotor axis.

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