CN215870948U

CN215870948U - Rotor punching sheet structure with segmented staggered poles

Info

Publication number: CN215870948U
Application number: CN202121548796.6U
Authority: CN
Inventors: 钟成; 雷正雨; 岑文成; 霍本杰; 韦思如; 黄珍恒; 李豪发
Original assignee: LIUZHOU WULING LIUJI POWER CO Ltd
Current assignee: LIUZHOU WULING LIUJI POWER CO Ltd
Priority date: 2021-07-08
Filing date: 2021-07-08
Publication date: 2022-02-18
Anticipated expiration: 2031-07-08

Abstract

The utility model discloses a rotor punching structure with segmented staggered poles, which comprises a circular rotor punching, wherein the middle part of the rotor punching is provided with a shaft hole, the rotor punching is provided with a plurality of groups of V-shaped permanent magnet grooves which are arranged in an annular matrix manner, the inner side wall of the shaft hole of the rotor punching is provided with the number of key grooves according to the number of pole pairs of a motor, the groove of a first key groove is parallel to the vertical direction, the position of the first key groove rotating anticlockwise for 360/p + theta degrees is the position of a second key groove, the position of the N key groove rotating anticlockwise for 360/p + theta degrees is the position of a N +1 key groove, p is the number of pole pairs of the motor, N is an integer which is more than 1 and less than 6, and a semicircle mark is added in the odd number of key grooves. By adopting the structure, the rotor pole-staggering structure can be completed in a single die without a reverse sheet mode, the error rate in the rotor assembly process is reduced, the production efficiency is improved, and the production cost of the motor is reduced.

Description

Rotor punching sheet structure with segmented staggered poles

Technical Field

The utility model relates to the technical field of motors, in particular to a rotor punching structure with segmented staggered poles.

Background

With the continuous deterioration of the world's natural environment and the shortage of fossil energy supply, electric vehicles are an effective way to ensure the mobility of human beings and to realize the sustainable development of the automobile industry while reducing the dependence on fossil fuels and environmental pollution. Electric energy is used as a novel clean energy and will become the inevitable trend of future energy development, and electric automobiles will inevitably replace traditional fuel automobiles and become the leading cause of a new era. The driving motor adopted by the electric automobile is mainly a permanent magnet synchronous motor.

The permanent magnet synchronous motor has small volume, light weight, high efficiency and high power factor, and gradually replaces an asynchronous motor in many fields, but the permanent magnet motor also has some defects, for example, because the slotting of a stator core of the permanent magnet synchronous motor and a rotor permanent magnet interact, tooth harmonic electromagnetic torque is formed, noise and vibration are increased, eddy current loss is increased, and the like. Measures such as stator skewed slots, rotor skewed poles and the like are generally adopted. When the permanent magnet motor adopts the stator skewed slot, the line of the motor is difficult, and the slot filling rate of the motor is reduced, so that the torque density and the power density of the motor are reduced, and the manufacturing complexity of the motor is increased. The adoption of the segmented pole staggering usually needs to design a rotor punching sheet structure with the same number of segments, and a plurality of sets of dies are needed during batch production, so that the manufacturing cost of the motor is greatly increased.

Disclosure of Invention

The utility model aims to overcome the defects in the prior art, and provides a rotor punching sheet structure with segmented pole staggering, which can realize a single die and complete the pole staggering structure of a rotor in a sheet reversing manner, reduce the error rate in the rotor assembly process, improve the production efficiency and reduce the production cost of a motor.

The technical scheme adopted by the utility model for realizing the purpose is as follows: the utility model provides a rotor punching structure of segmentation wrong utmost point, including circular shape rotor punching, the rotor punching middle part is equipped with the shaft hole, be equipped with the multiunit V-arrangement permanent magnet groove with annular matrix mode range on the rotor punching, the shaft hole inside wall of rotor punching sets up the keyway number according to motor number of pole pairs, the groove of a keyway is on a parallel with vertical direction, the position by a keyway position anticlockwise rotation 360/p + theta degree is No. two keyway places, the position by No. N keyway place anticlockwise rotation 360/p + theta degree is No. 1 keyway places N, p is the motor number of pole pairs, N is greater than 1 and is less than 6 integer, it has the semicircle mark to add in No. odd number keyway.

The further technical scheme of the utility model is as follows: the p =4 or 6, N is an integer which is larger than 1 and smaller than 4 when p =4, and N is an integer which is larger than 1 and smaller than 6 when p = 6.

The further technical scheme of the utility model is as follows: a middle permanent magnet groove in a straight shape is arranged between two rectangular permanent magnet grooves of each group of V-shaped permanent magnet grooves, and the extending direction of the middle permanent magnet groove is perpendicular to the radial direction of the rotor punching sheet.

The rotor punching sheet structure with the segmented staggered poles has the following beneficial effects: 1) by adopting the rotor punching sheet, the rotor is segmented and staggered only by one set of die without the need of sheet reversing; based on single mould processing rotor punching, fold the multiple-end rotor respectively, distinguish the keyway number according to the keyway mark of difference, correspond different keyway numbers to the multistage rotor and carry out whole closed assembly, reduced the error rate of multistage rotor assembly to improve the production efficiency of motor, reduction in production cost. 2) The segmented rotor is beneficial to reducing the cogging torque of the motor and reducing the vibration noise problem of the motor.

The structure of the rotor punching sheet with segmented staggered poles of the utility model is further explained with reference to the drawings and the embodiment.

Drawings

FIG. 1 is a schematic structural diagram of a rotor sheet structure with segmented alternate poles according to the present invention;

FIG. 2 is a schematic structural view of the rotor plate with segmented alternate poles shown in FIG. 1 illustrating the angle difference between the key slots;

the reference numbers illustrate: 1-rotor punching sheet, 2-shaft hole, 3-second key groove, 4-semicircle mark, 5-first key groove, 6-V-shaped permanent magnet groove, 7-middle permanent magnet groove, 8-fourth key groove, 9-third key groove, A-vertical center line and B-horizontal center line.

Detailed Description

The utility model relates to a rotor punching structure with segmented staggered poles, which comprises a round rotor punching, wherein the middle part of the rotor punching is provided with a shaft hole. The rotor punching sheet is provided with a plurality of groups of V-shaped permanent magnet grooves which are arranged in an annular matrix mode, and the number of key grooves is arranged on the inner side wall of the shaft hole of the rotor punching sheet according to the number of pole pairs of the motor. The groove of the first key groove is parallel to the vertical direction, namely the central line of the first key groove is superposed with the central line A of the shaft hole in the vertical direction. The position of the first key groove rotated by 360/p + theta degrees anticlockwise is the position of the second key groove, the position of the N key groove rotated by 360/p + theta degrees anticlockwise is the position of the N +1 key groove, p is the number of pole pairs of the motor, and N is an integer larger than 1 and smaller than 6. p =4 or 6, N is an integer greater than 1 and less than 4 when p =4, and N is an integer greater than 1 and less than 6 when p = 6. Theta is the angle of the staggered level between each section of the rotor core, theoretically can take any value within 90 degrees, a person skilled in the art can take a reasonable numerical value according to design requirements, and theta is mainly taken within the range of 1-10 degrees in actual design. And semicircular marks are added in odd-numbered key grooves.

In the present embodiment, the number of pole pairs of the motor is 4, i.e., p =4, θ =2.5 °. As shown in fig. 1 and 2, a linear middle permanent magnet slot is arranged between two rectangular permanent magnet slots of each group of V-shaped permanent magnet slots, the extending direction of the middle permanent magnet slot is perpendicular to the radial direction of the rotor punching sheet, each group of V-shaped permanent magnet slots and the permanent magnet assembled in the linear middle permanent magnet slot form a pole, and the magnetizing direction is perpendicular to the long side direction of the permanent magnet rectangle. The inside wall of the shaft hole of the rotor punching sheet is provided with 4 key grooves. The groove of the first key groove is parallel to the vertical direction, namely the central line of the first key groove is superposed with the central line A of the shaft hole in the vertical direction. The position rotated 90+2.5=92.5 degrees counterclockwise from the position of the first key slot is the position of the second key slot, the position rotated 90+2.5=92.5 degrees counterclockwise from the position of the second key slot is the position of the third key slot, and the position rotated 90+2.5=92.5 degrees counterclockwise from the position of the third key slot is the position of the fourth key slot. A semicircle mark is added in a key groove and a key groove III, and a semicircle mark can be added in the key groove I and two semicircle marks are added in the key groove III for obvious distinction.

The above embodiments are only preferred embodiments of the present invention, and the structure of the present invention is not limited to the forms of the above embodiments, and any modifications, equivalents and the like within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The utility model provides a rotor punching structure of segmentation wrong utmost point, including circular shape rotor punching (1), rotor punching (1) middle part is equipped with shaft hole (2), be equipped with multiunit V-arrangement permanent magnet groove (6) of arranging with annular matrix mode on rotor punching (1), shaft hole (2) inside wall of rotor punching (1) sets up keyway number according to the motor pole pair number, the groove of keyway (5) is on a parallel with vertical direction, a serial communication port, the position by a keyway (5) position anticlockwise rotation 360/p + theta degree is No. two keyway (3) places, the position by No. N keyway place anticlockwise rotation 360/p + theta degree is No. 1 keyway place N, p is the motor pole pair number, N is the integer that is greater than 1 and is less than 6, it has semicircle mark (4) to add in odd number keyway.

2. The segmented stagger-polarized rotor sheet structure according to claim 1, wherein p =4 or 6, N is an integer greater than 1 and less than 4 when p =4, and N is an integer greater than 1 and less than 6 when p = 6.

3. The rotor punching structure with the segmented staggered poles as claimed in claim 1, wherein a middle permanent magnet groove (7) in a straight line shape is arranged between two rectangular permanent magnet grooves of each group of V-shaped permanent magnet grooves (6), and the extending direction of the middle permanent magnet groove (7) is perpendicular to the radial direction of the rotor punching sheet (1).