CN215186128U

CN215186128U - Rotor punching sheet structure capable of effectively reducing magnetic leakage

Info

Publication number: CN215186128U
Application number: CN202022818534.9U
Authority: CN
Inventors: 朱琳; 张涛; 韩河帅
Original assignee: Zhengzhou Zhiqu Technology Co ltd
Current assignee: Zhengzhou Zhiqu Technology Co ltd
Priority date: 2020-11-30
Filing date: 2020-11-30
Publication date: 2021-12-14
Anticipated expiration: 2030-11-30

Abstract

The utility model discloses a rotor punching structure for effectively reducing magnetic leakage, which comprises rotor punching sheets with different oblique angle angles, wherein each rotor punching sheet comprises a rotor punching sheet body, and double V magnetic steel through holes are formed in the rotor punching sheet body and are symmetrically distributed along the circumferential direction; and the double V magnetic steel through holes are provided with symmetrical grooves for reducing magnetic leakage. The utility model can effectively reduce the magnetic leakage phenomenon generated by the sectional oblique pole; the punching sheet has a simple structure, is beneficial to the performance of the motor, has no additional cost and does not influence the efficiency of the motor.

Description

Rotor punching sheet structure capable of effectively reducing magnetic leakage

Technical Field

The utility model relates to a motor structure field, concretely relates to effectively reduce rotor punching structure of magnetic leakage.

Background

Harmonic waves, torque ripples, cogging torque and the like are important influencing factors influencing the performance of the motor, and in order to reduce the influence of the harmonic waves, the stator skewed slot and the rotor skewed pole are generally adopted at the beginning of the design of the motor. The stator chute has a complex process, the automation offline difficulty is high, the process consistency is difficult to guarantee, and the rotor segmented skewed pole has the advantages of relatively simple process, high automation operation efficiency and good consistency and is more widely applied.

In order to achieve the purpose of optimizing the harmonic wave, the torque pulsation and the cogging torque of the motor, the oblique pole angle and the segmentation number of the segmented oblique poles of the rotor are fixed, and the axial magnetic flux leakage phenomenon of the magnetic steel can be generated if the oblique pole angle is too large under the condition of ensuring the performance of the motor, so that the output performance of the motor is reduced, and the motor index does not reach the standard.

Disclosure of Invention

The utility model discloses the main problem of solving is because the too big magnet steel axial magnetic leakage that leads to of rotor segmentation oblique polar angle provides the rotor sheet structure that can effectively reduce the magnetic leakage, reduces the motor performance loss.

The utility model adopts the technical proposal that: a rotor punching structure capable of effectively reducing magnetic leakage comprises rotor punching sheets with different oblique pole angles, wherein each rotor punching sheet comprises a rotor punching sheet body, double-V magnetic steel through holes are formed in the rotor punching sheet body, and the double-V magnetic steel through holes are symmetrically distributed along the circumferential direction; and the double V magnetic steel through holes are provided with symmetrical grooves for reducing magnetic leakage.

Further, the double-V magnetic steel through hole comprises a large V double arm and a small V double arm, and the small V double arm is arranged between the large V double arm and the outer edge of the rotor; the symmetrical groove is positioned at the inner side of the small V double arm close to the outer edge of the rotor.

Further, the minimum distance between the symmetrical groove and the outer edge of the rotor is not less than the size of a magnetic isolation bridge at the outer edge of the rotor and the small V-shaped double arms; the center of the rotor is taken as the midpoint, the included angle between the starting point of the symmetrical groove and the horizontal direction is 8.9 degrees, and the included angle between the starting point and the end point of the symmetrical groove and the center of the rotor is 1-2 degrees.

The utility model discloses following beneficial effect has:

1. by adopting the technical scheme, the contact area between the magnetic steel and the rotor punching sheet in the oblique pole sections of the two adjacent rotors is reduced, and the magnetic flux leakage phenomenon of the magnetic steel in the axial direction is reduced.

2. Effectively reducing the magnetic steel axial magnetic flux leakage phenomenon generated by overlarge angle of the segmented oblique poles.

3. The rotor punching sheet has a simple structure, is beneficial to the performance of the motor, has no additional cost, and does not influence the efficiency of the motor and other performances.

Drawings

FIG. 1 shows the structure of the rotor sheet of the present invention;

FIG. 2 is a schematic plan view of two adjacent segments of a rotor sheet;

FIG. 3 is a schematic view of an axial magnetic flux leakage curve of two adjacent layers of magnetic steel;

in the figure: 1-large V double arm, 21-magnetic isolation bridge I, 22-magnetic isolation bridge II, 3-small V double arm, 41-magnetic leakage region I, 42-magnetic leakage region II, 5-double V magnetic steel through hole, 6-rotor body and 7-symmetrical groove.

Detailed Description

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

The utility model relates to an effectively reduce rotor punching structure of magnetic leakage, through segmentation down tube angle, magnet steel position, motor performance, rotor towards piece intensity design grooving size and position, when guaranteeing to satisfy the motor speed requirement towards piece intensity, reduce the magnet steel magnetic leakage that produces by the rotor segmentation down tube.

As shown in fig. 1 and 2, the rotor sheet structure of the present invention includes a double V-shaped magnetic steel through hole 5 and a rotor body 6, the double V-shaped magnetic steel through hole 5 is symmetrically distributed on the rotor body 6 along the circumferential direction, and includes a large V-shaped double arm 1 and a small V-shaped double arm 3, and the small V-shaped double arm is disposed between the large V-shaped double arm and the outer edge of the rotor; symmetrical grooves 7 are arranged at the inner sides of the small V-shaped double arms close to the outer edge of the rotor.

As shown in fig. 2, a thick solid line is an upper-segment rotor punching sheet, a thin solid line is a lower-segment rotor punching sheet, and after two adjacent segments of rotor poles, under the condition that the small V double arms 3 are not provided with the symmetrical grooves 7, a first magnetic leakage region 41 and a second magnetic leakage region 42 may be generated at the contact part of the magnetic steel and the punching sheet of the two adjacent segments of rotor punching sheets, and the magnetic leakage curve of the magnetic steel is shown in fig. 3. In order to reduce the magnetic leakage phenomenon and reduce the axial magnetic leakage generated by rotor segmented skewed poles, symmetrical grooves 7 are dug at the parts, close to a first magnetic leakage area 41 and a second magnetic leakage area 42, of the inner sides of small V-shaped double arms 3, the minimum distance between the dug symmetrical grooves 7 and the outer edge of the rotor is not smaller than the size of a first magnetic isolation bridge 21 at the outer edge of the large V-shaped double arms 1 and the outer edge of the rotor and the size of a second magnetic isolation bridge 22 at the outer edge of the small V-shaped double arms 3 and the outer edge of the rotor, the center of the rotor is taken as a middle point, the included angle between the starting point of the symmetrical grooves 7 and the horizontal direction is 8.9 degrees, and the included angle between the starting position and the ending position of the symmetrical grooves 7 and the center of the rotor is 1 degree to 2 degrees.

The utility model discloses can reduce the axial magnetic leakage phenomenon by rotor segmentation down tube production effectively, and processing technology is comparatively simple, does not have the additional cost, is favorable to the motor performance, promotes motor efficiency, can extensively be used for motor axial magnetic leakage solution.

Claims

1. The utility model provides an effectively reduce rotor punching structure of magnetic leakage, comprises the rotor punching of different oblique polar angles, the rotor punching includes the rotor punching body, its characterized in that: the rotor punching sheet body is provided with double-V magnetic steel through holes which are symmetrically distributed along the circumferential direction; the double-V magnetic steel through hole is provided with a symmetrical groove for reducing magnetic leakage; the double-V magnetic steel through hole comprises a large V double arm and a small V double arm, and the small V double arm is arranged between the large V double arm and the outer edge of the rotor; the symmetrical grooves are positioned at the inner sides of the small V double arms and close to the outer edge of the rotor; the minimum distance between the symmetrical groove and the outer edge of the rotor is not less than the size of a magnetic isolation bridge at the outer edge of the rotor and the small V-shaped double arms; the center of the rotor is taken as the midpoint, the included angle between the starting point of the symmetrical groove and the horizontal direction is 8.9 degrees, and the included angle between the starting point and the end point of the symmetrical groove and the center of the rotor is 1-2 degrees.