CN216959446U

CN216959446U - Stator core, PMSM and new energy automobile

Info

Publication number: CN216959446U
Application number: CN202123270730.8U
Authority: CN
Inventors: 陈彬; 汪汉新; 贾金信; 刘佳佳; 黄浩涛
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2021-12-23
Filing date: 2021-12-23
Publication date: 2022-07-12
Anticipated expiration: 2031-12-23

Abstract

The application provides a stator core, PMSM and new energy automobile. The stator core comprises a yoke portion (1) and tooth portions (2), wherein the tooth portions (2) are located on the inner peripheral side of the yoke portion (1), tooth grooves (3) are formed between every two adjacent tooth portions (2), the tooth grooves (3) are open grooves, the width of a notch of each tooth groove (3) located on two sides of a q shaft and adjacent to the q shaft is B1, the width of notches of other tooth grooves (3) is B0, and B1 is less than B0. According to the stator core, the torque ripple of the permanent magnet synchronous motor can be reduced, and the NVH performance of the motor is better.

Description

Stator core, PMSM and new energy automobile

Technical Field

The application relates to the technical field of new energy vehicles, in particular to a stator core, a permanent magnet synchronous motor and a new energy vehicle.

Background

With the increasing importance of people on environmental protection and efficient energy utilization, the trend of automobiles under the eye becomes a common industrial consensus, the electric surge of automobiles is increasingly disturbed, and the driving motor is used as a key ring for energy conversion of new energy automobiles, so that the new energy automobiles are greatly influenced. The permanent magnet synchronous motor has the advantages of large torque density, high efficiency, good stability, high reliability and the like, so that the permanent magnet synchronous motor is widely applied to the field of pure electric or hybrid new energy automobiles.

With the development of new energy industry technology, the NVH (noise, vibration and harshness) performance of a driving system is more important, and the cost pressure of a motor is higher, so that the NVH problem of getting on the motor needs to be fully considered and solved during motor development.

SUMMERY OF THE UTILITY MODEL

Therefore, the technical problem that this application will be solved lies in providing a stator core, PMSM and new energy automobile, can reduce PMSM torque ripple for motor NVH performance is more excellent.

In order to solve the above problems, the present application provides a stator core including a yoke and tooth portions, the tooth portions are located on an inner circumferential side of the yoke, tooth slots are formed between adjacent tooth portions, the tooth slots are open slots, a slot width of a tooth slot located on both sides of a q axis and adjacent to the q axis is B1, a slot width of another tooth slot is B0, and B1 < B0.

Preferably, the tooth grooves are used for arranging windings, the wire diameter of the windings is d, the unit is mm, and B1 is more than or equal to 2 d.

Preferably, B1 ═ 2d to (2d +0.2) mm.

Preferably, B1 is 2.0mm to 2.2 mm.

Preferably, B1-1.9 mm and B0-2.5 mm.

Preferably, the inner diameter of the stator core is Di, B0/Di is 0.0158, and B1/Di is 0.012.

Preferably, the inner diameter of the stator core is Di, the outer diameter of the stator core is Do, and the split ratio a of the stator core is Di/Do is 0.687.

Preferably, the slot depth Hs2 of the stator core satisfies Hs2 being 17mm to 17.5mm, wherein the slot depth Hs2 of the stator core is a length of sides of both sides of the slot in a circumferential direction in a cross section perpendicular to the rotor core.

Preferably, the tooth width T of the stator core is (0.32-0.34) Hs2, where Hs2 is the slot depth of the stator core.

Preferably, the circumferential width of the slot bottom of the stator core is Bs2, Bs2 ═ Hs2 (0.4-0.42), wherein Hs2 is the slot depth of the stator core.

According to another aspect of the present application, there is provided a permanent magnet synchronous motor including a stator core, which is the above-described stator core.

Preferably, the outer diameter Do of the stator of the permanent magnet synchronous motor is 230mm, the inner diameter Di of the stator is 158mm, and the peak power is 100Kw to 1200 Kw.

According to another aspect of the application, a new energy automobile is provided, which comprises the above stator core or the above permanent magnet synchronous motor.

The application provides a stator core, including yoke portion and tooth portion, the tooth portion is located the inner peripheral side of yoke portion, forms the tooth's socket between the adjacent tooth portion, and the tooth's socket is the open slot, is located q axle both sides and is B1 with the notch width of the adjacent tooth's socket of q axle, and the notch width of other tooth's sockets is B0, and B1 < B0. The stator core starts from the size design of a motor stator of a permanent magnet synchronous motor, the motor tooth space torque and the torque ripple are used as final optimization targets, the size design of the motor stator is optimized, the width of tooth space notches on two sides of a q shaft and the width of tooth space notches on other positions are optimized through simulation and combined with production process requirements, the torque ripple of the motor is lower, and the NVH performance is better.

Drawings

Fig. 1 is a schematic structural view of a stator core according to an embodiment of the present application;

fig. 2 is a schematic view illustrating a dimensional structure of a stator core according to an embodiment of the present application;

FIG. 3 is a diagram of a stator core and rotor assembly according to one embodiment of the present application;

fig. 4 is a cogging torque diagram of a related art permanent magnet synchronous motor;

FIG. 5 is a torque ripple schematic of a related art permanent magnet synchronous motor;

fig. 6 is a cogging torque diagram of a permanent magnet synchronous motor using a stator core according to an embodiment of the present application;

fig. 7 is a schematic view of torque ripple of a permanent magnet synchronous motor using a stator core according to an embodiment of the present application.

The reference numbers are given as:

1. a yoke portion; 2. a tooth portion; 3. a tooth socket.

Detailed Description

The fundamental causes of torque ripple in permanent magnet synchronous motors are: the permeance of the air gap magnetic field track changes, which causes the magnetic flux to change, and causes the torque to be inconsistent and the torque to pulsate at different positions.

In order to solve the above problem, referring to fig. 1 to 3 in combination, according to an embodiment of the present application, a stator core includes a yoke 1 and tooth portions 2, the tooth portions 2 are located on an inner peripheral side of the yoke 1, tooth slots 3 are formed between adjacent tooth portions 2, the tooth slots 3 are open slots, a slot width of the tooth slot 3 located on both sides of and adjacent to a q-axis is B1, slot widths of other tooth slots 3 are B0, and B1 < B0.

The stator core starts from the size design of a motor stator of a permanent magnet synchronous motor, the motor tooth space torque and the torque ripple are used as final optimization targets, the size design of the motor stator is optimized, the width of tooth space notches on two sides of a q shaft and the width of tooth space notches at other positions are optimized through simulation and combined with production process requirements, the motor tooth space torque and the torque ripple are lower, and the NVH performance is better.

Cogging torque is generated by magnetic conductance change, which causes magnetic field energy storage change; the rotor q axis magnetic flux is high, and the corresponding stator tooth part magnetic flux is high and the magnetic conductance is small. Because the motor magnetic flux is higher in the direction of the q axis of the motor, in order to reduce the magnetic flux difference on the whole rotor circumference, the motor magnetic flux distribution needs to be optimized, the air gap magnetic field permeance difference is reduced, and the motor torque pulsation is optimized. In this embodiment, the width of the slot of the adjacent tooth space 3 on both sides of the q axis is smaller than the width of the slot of other tooth spaces 3, so that the width of the slot of the stator is reduced, the size of the stator teeth is increased, the magnetic conductance of the tooth part related to the slot of the stator is increased, and the air gap magnetic flux in the q axis direction of the motor is reduced, so that the air gap magnetic flux on the whole stator core is more uniformly distributed, the torque and the torque ripple of the motor tooth space are reduced, and the NVH performance of the motor is optimized.

In one embodiment, the tooth slots 3 are used for arranging windings, the wire diameter of the windings is d and is measured in mm, and B1 is larger than or equal to 2 d.

In one embodiment, B1 ═ 2d to (2d +0.2) mm.

In one embodiment, B1 is 2.0mm to 2.2 mm.

When the production process is considered, in order to ensure the production and stator inserting efficiency, when the wire diameter used by the stator inserting is larger than or equal to 1mm, the size of the notch B1 can be properly enlarged, the ideal design range is 2.0-2.2mm, two wires can be simultaneously inserted, the production efficiency of the motor stator is ensured, and the cogging torque and the torque pulsation of the motor can be optimized to a certain degree.

In one embodiment, B1-1.9 mm and B0-2.5 mm. In the embodiment, the stator offline efficiency is not considered, and only the cogging torque and the torque ripple of the motor are considered, so that the design can minimize the cogging torque, minimize the torque ripple and optimize the NVH of the motor.

In one embodiment, the inner diameter of the stator core is Di, B0/Di is 0.0158, and B1/Di is 0.012.

In this embodiment, the width of each slot of the tooth slot 3 is associated with the inner diameter of the stator core, so that the limitation can be applied to motors with various model sizes, and the applicability of the structural size design of the stator core can be improved.

In one embodiment, the inner diameter of the stator core is Di, the outer diameter of the stator core is Do, and the split ratio a of the stator core is Di/Do is 0.687.

The tooth space groove depth Hs2 of the stator core meets Hs2 which is 17 mm-17.5 mm, wherein the tooth space groove depth Hs2 of the stator core is the length of the side edges of two sides of the tooth space 3 in the circumferential direction in the cross section perpendicular to the rotor core.

Tooth width T of the stator core is (0.32-0.34) Hs2, wherein Hs2 is tooth slot depth of the stator core, so that uniform magnetic density and magnetic conductance of a tooth part can be guaranteed, torque pulsation is small, and magnetic density saturation is avoided.

In the design process of the stator core, starting from the stator side, the ratio a of the inner diameter to the outer diameter of the stator is determined to be 0.687 according to the design with the largest output force and the lowest motor material cost, the depth size range Hs2 of the motor stator core is determined to be 17-17.5mm according to the requirement of the full rate of the slot under the stator winding, and then the magnetic density of the silicon steel sheets used by the stator core in the embodiment of the application is not more than 2T according to the tooth density uniformity of the stator tooth part and the requirement of the allowable magnetic density of the material; according to the comparison of finite element analysis results, the tooth width T of the stator is determined to be (5.8 +/-0.2) mm, at the moment, the magnetic density of the tooth part of the motor is uniformly distributed, the magnetic conductance consistency is good, and the torque pulsation of the motor is low.

In the present embodiment, the stator teeth have a parallel teeth structure, and in a cross section perpendicular to the central axis of the stator core, the length of two parallel sides of the same tooth 2 is the slot depth Hs2 of the stator core.

In this embodiment, the bottom of tooth's socket 3 adopts the circular arc structure to link up with the parallel side of tooth portion 2, form the wire casing structure, adopt the hypotenuse to connect parallel side and the notch side with one side at the notch department of stator tooth's socket 3, form the tooth's socket structure of binding off.

In one embodiment, the stator core has a slot bottom circumferential width Bs2, (Bs 2) (0.4-0.42) Hs2, wherein Hs2 is the slot depth of the stator core. After the outer diameter of the stator is fixed and the split ratio is determined, the size design of the tooth yoke of the stator has a better range to enable the magnetic densities of the tooth and the yoke to be close to each other; by simulating the size ratio, the range can be obtained, so that the magnetic density uniformity is better. This kind of injecture can be optimized the structure of stator yoke portion to effectively solve the even problem of stator yoke portion magnetic density. In one embodiment, Bs ═ 6.8-7.35 mm.

After stator core is designed according to the mode, the stator notch close to the q-axis is reduced, the magnetic conductance of the magnetic steel at the motor air gap is increased, the low magnetic conductance at the rotor magnetic bridge can be neutralized at the moment, the magnetic conductance of the whole motor air gap is more uniform, and the purpose of optimizing motor torque pulsation is achieved.

Referring to fig. 4 and 5 in combination, a slot torque and torque ripple simulation diagram of a related art motor based on the improvement of the present application, in which the slot torque is 3.1156Nm and the torque ripple is 5.12%, is shown when the size of a stator slot of the related art motor is designed to be 2.5 mm.

Referring to fig. 6 and 7 in combination, for a motor using the stator core of the embodiment of the present application, a cogging torque and a torque ripple graph are simulated when B1 is 1.9mm and B0 is 2.5mm, and the cogging torque of the motor is 2.4066Nm and the torque ripple is 3.6%.

Compared with the motor in the embodiment of the application, the motor adopting the stator core in the embodiment of the application has the advantages that the cogging torque is reduced by 22.7%, the torque ripple is reduced by 29.7%, and the NVH performance is greatly improved.

In this embodiment, the stator core has a parallel tooth structure.

The motor stator core size design of this application embodiment, 17-17.5mm is got to motor stator core's tooth's socket depth Hs2 promptly, stator tooth width T is (5.8 +/-0.2) time, the stator core notch has 1.9mm, two sizes of 2.5mm, wherein the notch that the size is 1.9mm is located motor q axle direction both sides, the remaining notch size of stator core is 2.5mm, the tooth's socket torque of motor this moment is little, torque pulsation is low, and only the size that is located two notches of q axle both sides diminishes, do not influence stator production, overall efficiency when inserting the production line, when guaranteeing to optimize motor NVH performance, motor production efficiency is secure.

According to an embodiment of the application, the permanent magnet synchronous motor comprises a stator core, and the stator core is the stator core.

In one embodiment, the outer diameter Do of the stator of the permanent magnet synchronous motor is 230mm, the inner diameter Di of the stator is 158mm, and the peak power is 100Kw to 1200 Kw. The motor is particularly suitable for a motor speed reduction system of a 4.5t-6t logistics vehicle.

According to an embodiment of the application, the new energy automobile comprises the stator core or the permanent magnet synchronous 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 application is intended to cover various modifications, equivalent arrangements, and adaptations of the present application without departing from the spirit and scope of the present application. 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

1. The stator core is characterized by comprising a yoke part (1) and tooth parts (2), wherein the tooth parts (2) are located on the inner peripheral side of the yoke part (1), tooth grooves (3) are formed between the adjacent tooth parts (2), the tooth grooves (3) are open slots, the width of a slot of each tooth groove (3) located on two sides of a q axis and adjacent to the q axis is B1, the width of the slot of other tooth grooves (3) is B0, and B1 is less than B0.

2. Stator core according to claim 1, characterized in that the slots (3) are intended for the arrangement of windings having a wire diameter d in mm, B1 ≧ 2 d.

3. The stator core according to claim 2, wherein B1 is 2d to (2d +0.2) mm.

4. The stator core according to claim 3, wherein B1 is 2.0mm to 2.2 mm.

5. The stator core according to claim 1, wherein B1-1.9 mm and B0-2.5 mm.

6. The stator core according to claim 1, wherein the inner diameter of the stator core is Di, B0/Di is 0.0158, and B1/Di is 0.012.

7. The stator core according to any one of claims 1 to 6, wherein the stator core has an inner diameter Di and an outer diameter Do, and a split ratio a Di/Do 0.687.

8. The stator core according to any one of claims 1 to 6, characterized in that a slot depth Hs2 of the stator core satisfies Hs 2-17.5 mm, wherein the slot depth Hs2 of the stator core is a side length of both sides of the slot (3) in a circumferential direction in a cross section perpendicular to the rotor core.

9. The stator core according to any one of claims 1 to 6, wherein a tooth width T ═ 0.32-0.34 ═ Hs2, where Hs2 is a slot depth of the stator core.

10. The stator core according to any one of claims 1 to 6, wherein the stator core has a slot bottom circumferential width Bs2, (Bs 2) (0.4-0.42) Hs2, wherein Hs2 is the slot depth of the stator core.

11. A permanent magnet synchronous machine comprising a stator core, characterized in that the stator core is a stator core according to any one of claims 1 to 10.

12. The permanent magnet synchronous motor according to claim 11, wherein the outer diameter Do of the stator of the permanent magnet synchronous motor is 230mm, the inner diameter Di of the stator is 158mm, and the peak power is 100Kw to 1200 Kw.

13. A new energy automobile, characterized by comprising the stator core of any one of claims 1 to 10 or the permanent magnet synchronous motor of claim 11 or 12.