CN-224218164-U - Motor rotor and motor

CN224218164UCN 224218164 UCN224218164 UCN 224218164UCN-224218164-U

Abstract

The utility model discloses a motor rotor and a motor, and belongs to the technical field of motors. The motor rotor comprises a rotor core, a plurality of permanent magnets, a plurality of magnetic barriers and a plurality of first magnetic isolation bridges. The rotor iron core is provided with first arc-shaped mounting grooves, permanent magnets are accommodated in first sub-grooves in the first arc-shaped mounting grooves, magnetic barriers are accommodated in second sub-grooves and third sub-grooves, anti-demagnetization capability of the motor can be enhanced through the arrangement of the magnetic barriers at two ends of the permanent magnets, two first magnetism isolating bridges can be arranged in each first arc-shaped mounting groove and used for enhancing mechanical strength of the motor rotor, vibration and deformation of the motor rotor in high-speed operation are reduced, meanwhile, the number of the permanent magnets in the motor rotor can be reduced through the arrangement of the two first magnetism isolating bridges at the two ends of the permanent magnets, assembly steps of the motor rotor are simplified, and failure rate and installation cost of the permanent magnets in the assembly process are reduced.

Inventors

WU QIANNAN
LIAO CHUNQIN

Assignees

厦门钨业股份有限公司

Dates

Publication Date: 20260508
Application Date: 20250328

Claims (10)

1. The motor rotor is characterized by comprising a rotor core, a plurality of permanent magnets, a plurality of magnetic barriers and a plurality of first magnetism isolating bridges; The rotor core is provided with a plurality of mounting groove groups which are arranged along the circumferential direction of the rotor core, and any one of the mounting groove groups comprises a plurality of arc-shaped mounting grooves which are arranged at intervals along the radial direction of the rotor core; The plurality of arc-shaped mounting grooves comprise first arc-shaped mounting grooves, any one of the first arc-shaped mounting grooves comprises a first sub-groove, a second sub-groove and a third sub-groove, and the second sub-groove and the third sub-groove are respectively positioned at two ends of the first sub-groove; The permanent magnet is accommodated in any one of the first sub-grooves, and the magnetic barrier is accommodated in any one of the second sub-grooves and any one of the third sub-grooves; The first magnetism isolating bridge is arranged between a first sub-groove and a second sub-groove in any one of the first arc-shaped mounting grooves, the first magnetism isolating bridge is also arranged between a first sub-groove and a third sub-groove in any one of the first arc-shaped mounting grooves, and two ends of the first magnetism isolating bridge are fixedly connected with the rotor core.
2. The motor rotor of claim 1, wherein the first magnetically isolated bridge extends in a direction parallel to a tangential direction of the rotor core.
3. The electric machine rotor of claim 1, wherein the plurality of arcuate mounting slots further comprises a second arcuate mounting slot located on a side of the first arcuate mounting slot proximate an outer edge of the rotor cell; The second arc-shaped mounting groove comprises a fourth sub groove and a fifth sub groove, the fifth sub groove is positioned at one end of the fourth sub groove, which is closer to the third sub groove, the permanent magnet is accommodated in any one of the fourth sub grooves, and the magnetic barrier is accommodated in any one of the fifth sub grooves; And the length of the third subslot is greater than that of the second subslot in the extending direction of the first arc-shaped mounting groove.
4. A motor rotor according to any one of claims 1-3, wherein the outer contour of any one of the arcuate mounting slots is symmetrical about a pole center line, which is the shortest line connecting the center of the arcuate mounting slot and the center of the rotor core; any one of the permanent magnets is asymmetric about the pole centerline; Two magnetic barriers in the second subslot and the third subslot of any one of the first arc-shaped mounting slots are asymmetric about the magnetic pole center line.
5. The motor rotor of claim 4, wherein an angle between the pole centerline and the d-axis is greater than 0 ° and less than or equal to 10 °.
6. The motor rotor of claim 2, further comprising a plurality of second magnetic shielding bridges disposed between both ends of any one of the arc-shaped mounting grooves and edges of the rotor core, both ends of the second magnetic shielding bridges being fixedly connected with the rotor core.
7. The motor rotor of claim 6, wherein the magnetic barrier in the first arcuate mounting slot satisfies the relationship: 2L2≤L1≤2W1; The L2 is the width of the second magnetism isolating bridge along the extending direction of the arc-shaped mounting groove, the L1 is the length of the magnetic barrier along the extending direction of the arc-shaped mounting groove, and the W1 is the width of the magnetic barrier.
8. A motor rotor according to claim 3, wherein the number of the first arc-shaped mounting grooves in any one of the mounting groove groups is two, and the number of the second arc-shaped mounting grooves is one; the two first arc-shaped mounting grooves are arranged at intervals along the radial direction of the rotor core; the second arc-shaped mounting groove is positioned on one side of the two arc-shaped mounting grooves, which is close to the edge of the rotor core.
9. A motor rotor as claimed in claim 3, wherein the magnetic barrier in the first arcuate mounting slot comprises a non-magnetically permeable structure formed of air, epoxy or polyester; The magnetic barrier in the second arc-shaped mounting groove comprises a non-magnetic conductive structure formed by epoxy resin or polyester fiber.
10. The motor is characterized by comprising a motor rotor, a motor stator and a motor shell; The motor rotor is selected from the motor rotor according to any one of claims 1 to 9, the motor stator is sleeved outside the motor rotor, and the motor shell is sleeved outside the motor stator.

Description

Motor rotor and motor Technical Field The utility model relates to the technical field of motors, in particular to a motor rotor and a motor. Background With the development of mechanical device technology, the requirements on the motor are higher and higher. The existing motors generally comprise Permanent Magnet Synchronous Motors (PMSM), synchronous reluctance motors (SynRM), permanent magnet auxiliary synchronous reluctance motors (PMa-SynRM) and the like, wherein the permanent magnet auxiliary synchronous reluctance motors combine the advantages of the permanent magnet synchronous motors and the synchronous reluctance motors, and have the characteristics of high efficiency, high power density, wide speed regulation range and the like. Permanent magnet assisted synchronous reluctance motors typically include a motor stator and a motor rotor, wherein the motor rotor may include a rotor core and permanent magnets that can be embedded in mounting slots of the rotor core for providing additional magnetic fields to assist in improving torque and efficiency. Because the motor rotor generally adopts a multi-layer magnetic pole design, a magnetic isolation bridge is arranged between adjacent permanent magnets in the same layer of magnetic pole so as to improve the structural strength of the motor rotor. However, the number of permanent magnets in the motor rotor is large, resulting in complicated assembly steps of the motor rotor. Disclosure of utility model The embodiment of the utility model provides a motor rotor and a motor. The permanent magnet assembly device can solve the problems that the number of permanent magnets in the prior art is large, and the assembly steps of a motor rotor are complicated, and the technical scheme is as follows: According to an aspect of the present utility model, there is provided a motor rotor including a rotor core, a plurality of permanent magnets, a plurality of magnetic barriers, and a plurality of first magnetic barrier bridges; The rotor core is provided with a plurality of mounting groove groups which are arranged along the circumferential direction of the rotor core, and any one of the mounting groove groups comprises a plurality of arc-shaped mounting grooves which are arranged at intervals along the radial direction of the rotor core; The plurality of arc-shaped mounting grooves comprise first arc-shaped mounting grooves, any one of the first arc-shaped mounting grooves comprises a first sub-groove, a second sub-groove and a third sub-groove, and the second sub-groove and the third sub-groove are respectively positioned at two ends of the first sub-groove; The permanent magnet is accommodated in any one of the first sub-grooves, and the magnetic barrier is accommodated in any one of the second sub-grooves and any one of the third sub-grooves; The first magnetism isolating bridge is arranged between a first sub-groove and a second sub-groove in any one of the first arc-shaped mounting grooves, the first magnetism isolating bridge is also arranged between a first sub-groove and a third sub-groove in any one of the first arc-shaped mounting grooves, and two ends of the first magnetism isolating bridge are fixedly connected with the rotor core. Optionally, the extending direction of the first magnetic isolation bridge is parallel to the tangential direction of the rotor core. Optionally, the plurality of arc-shaped mounting grooves further comprises a second arc-shaped mounting groove, and the second arc-shaped mounting groove is positioned at one side of the first arc-shaped mounting groove close to the outer edge of the rotor cell; The second arc-shaped mounting groove comprises a fourth sub groove and a fifth sub groove, the fifth sub groove is positioned at one end of the fourth sub groove, which is closer to the third sub groove, the permanent magnet is accommodated in any one of the fourth sub grooves, and the magnetic barrier is accommodated in any one of the fifth sub grooves; And the length of the third subslot is greater than that of the second subslot in the extending direction of the first arc-shaped mounting groove. Optionally, the outer contour of any one arc-shaped mounting groove is symmetrical about the magnetic pole center line, and the magnetic pole center line is the shortest connecting line between the center of the arc-shaped mounting groove and the center of the rotor core; the permanent magnet is asymmetric about the pole centerline; Two magnetic barriers in the second subslot and the third subslot of any one of the first arc-shaped mounting slots are asymmetric about the magnetic pole center line. Optionally, an included angle between the magnetic pole center line and the d axis is greater than 0 ° and less than or equal to 10 °. Optionally, the motor rotor further includes a plurality of second magnetism isolating bridges, wherein the second magnetism isolating bridges are arranged between two ends of any one of the arc-shaped mounting grooves