US-12620856-B2 - Rotor unit, rotor, and motor structure

US12620856B2US 12620856 B2US12620856 B2US 12620856B2US-12620856-B2

Abstract

The present disclosure provides a rotor unit, a rotor, and a motor structure. The rotor unit includes: a rotor punching sheet; a plurality of magnet units comprising a magnet and arranged on the rotor punching sheet; and a hole structure arranged in the magnet. The rotor includes a plurality of rotor units. The motor structure includes: the rotor, a first flow guide plate having a central hole and arranged between two adjacent rotor units, and a central shaft passing through a center of the rotor and the central hole. The present disclosure can effectively reduce the cost of the magnets, and can achieve a direct cooling of the magnets, the rotor and the stator, reduce the eddy current effect, reduce costs, and greatly expand an optimization and use range of the motors when applied in the motors.

Inventors

Liangzi LI
Jing Chen
Junjie Zhang
Liaoliao LI
Le Zhang
Jianbin Ye

Assignees

ZHEJIANG FOUNDER MOTOR CO., LTD.

Dates

Publication Date: 20260505
Application Date: 20211110
Priority Date: 20210629

Claims (13)

1 . A motor structure, comprising: a rotor comprising a first rotor group and a second rotor group, and one rotor unit in the first rotor group and one rotor unit in the second rotor group are arranged adjacent to each other, wherein the rotor unit comprises a rotor punching sheet, a plurality of magnet units comprising a magnet and arranged on the rotor punching sheet, and a hole structure arranged in the magnet; a first flow guide plate having a central hole and arranged between two adjacent rotor units, wherein the first flow guide plate comprises a first flow guide path therein; and a central shaft passing through a center of the rotor and the central hole, wherein the central shaft is provided with a flow guide hole, and the flow guide hole, the first flow guide path and the hole structure are communicated with each other; wherein when the first rotor group comprises a plurality of rotor units and the second rotor group comprises a plurality of rotor units, the motor structure further comprises a plurality of interlayer connection plates arranged between adjacent rotor units in the first rotor group and between adjacent rotor units in the second rotor group; wherein each interlayer connection plate comprises a second magnet unit interface extending through the interlayer connection plate.
2 . The motor structure according to claim 1 , wherein the rotor comprises a V-shaped skewed pole structure or a straight-line-shaped skewed pole structure.
3 . The motor structure according to claim 2 , wherein when the rotor comprises the straight-line-shaped skewed pole structure, and the sum of the number of the rotor units in the first rotor group and the number of the rotor units in the second rotor group is odd, the first flow guide plate is arranged in both halves of the rotor unit when any one of the rotor units is cut into two halves.
4 . The motor structure according to claim 1 , wherein the first flow guide path comprises a first flow guide path inlet and a first flow guide path outlet communicated with each other, and the first flow guide path inlet is arranged on a side wall of the center hole, wherein the flow guide hole is arranged corresponding to the first flow guide path inlet.
5 . The motor structure according to claim 4 , wherein the first flow guide plate further comprises a first magnet unit interface extending through the first flow guide plate, and the first flow guide path outlet is arranged corresponding to the first magnet unit interface, wherein a side wall of the first magnet unit interface exposes the first flow guide path outlet, and ends of the magnet units on two sides of the first flow guide plate are arranged at the first magnet unit interface.
6 . The motor structure according to claim 1 , wherein the second magnet unit interface is arranged corresponding to the magnet units, and ends of the magnet units on two sides of each interlayer connection plate are arranged at the second magnet unit interface.
7 . The motor structure according to claim 1 , further comprising a second flow guide plate arranged at each end of the rotor.
8 . The motor structure according to claim 7 , wherein the second flow guide plate comprises a second flow guide path, and the second flow guide path comprises a second flow guide path inlet and a second flow guide path outlet communicated with each other, wherein the second flow guide path inlet is arranged corresponding to the magnet units, and ends of the magnet units are arranged at the second flow guide path inlet.
9 . The motor structure according to claim 8 , wherein the second flow guide path outlet is arranged on a side wall of the second flow guide plate and uniformly distributed along a circumferential direction of the second flow guide plate.
10 . The motor structure according to claim 9 , wherein the number of the second flow guide path outlet is a multiple of the number of poles of the rotor.
11 . The motor structure according to claim 1 , wherein the hole structure extends through the magnet.
12 . The motor structure according to claim 1 , wherein each magnet unit comprises one or more magnets.
13 . The motor structure according to claim 1 , wherein the hole structure comprises one or more selected from a group consisting of a circular hole, a triangular hole and a rectangular hole.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS The present application is a national phase entry under 35 U.S.C. § 371 of International Application No. PCT/CN2021/129735, filed Nov. 10, 2021, which designates the United States of America, which claims the benefit of priority to Chinese patent application No. 202110732916.6, filed on Jun. 29, 2021, entitled “Rotor Unit, Rotor and Motor Structure”, the entire disclosures of which are incorporated herein by reference in their entireties and for all purposes. TECHNICAL FIELD The present disclosure relates to the field of automotive manufacturing technology, and more particularly to a rotor unit, a rotor and a motor structure. BACKGROUND New energy vehicles require high motor power and high torque to meet good starting acceleration or climbing ability. On the other hand, due to limited space and strict weight requirements of passenger cars, a motor must have high torque and power density. A permanent magnet synchronous motor (PMSM) is widely used in the new energy vehicles due to its excellent speed regulation ability and high torque density. In recent years, with continuous iteration of new energy vehicle electric drive technology, requirements for the highest speed and torque power density of the motor have also increased, which causes problems such as high motor temperature, difficulty in heat dissipation, and high cost for magnets. At present, new energy motor manufacturers are actively laying out and developing stator flat copper wire winding technology, which can effectively improve the temperature on a stator side of the motor. However, due to an alternating current effect, a flat copper wire will generate significant alternating current losses in a high-speed range, thus reducing temperature rise of the stator and the rotor of a flat wire motor in the high-speed range is particularly important. In addition, because a flat wire process mostly uses a full-pitch winding, the eddy current loss of the rotor is serious, especially in the high-speed range, the increased eddy current loss will make the temperature of the magnets too high, thus the magnets with higher coercivity grade is required. As the new energy vehicles pursue balance between cost and performance, the price of the magnets account for a large proportion in the whole motor. As the coercivity of the magnets increases, the cost increases as well. Therefore, innovative design is needed to ensure that the cost of the magnets or the motor is also relatively reasonable while parameters such as motor performance and quality meet the requirements. Therefore, how to effectively reduce the cost of the magnets and take into account the simultaneous direct cooling of the stator and the rotor is a technical problem that needs to be solved urgently. SUMMARY The embodiments of the present disclosure provide a rotor unit, a rotor and a motor structure, which can effectively reduce the cost of the magnets, and can achieve a direct cooling of the magnets, the rotor and the stator, reduce the eddy current effect, reduce costs, and greatly expand an optimization and use range of the motors when applied in the motors. According to an aspect of the present disclosure, a rotor unit is provided. The rotor unit includes: a rotor punching sheet; a plurality of magnet units including a magnet and arranged on the rotor punching sheet; and a hole structure arranged in the magnet. According to some embodiments, the hole structure extends through the magnet. According to some embodiments, each magnet unit includes one or more magnets. According to some embodiments, the hole structure includes one or more selected from a group consisting of a circular hole, a triangular hole, a rectangular hole and other shapes. According to some embodiments, the hole structure includes a single hole structure or an overlapping hole structure, and when the hole structure includes the overlapping bole structure, the hole structure includes a first hole structure and a second hole structure communicated with each other. According to another aspect of the present disclosure, a rotor is provided. The rotor includes a plurality of rotor units according to any one of preceding embodiments. According to another aspect of the present disclosure, a motor structure is provided. The motor structure includes a rotor according to any one of preceding embodiments. According to another aspect of the present disclosure, a motor structure is provided. The motor structure includes: a rotor according to any one of preceding embodiments, wherein the rotor includes a first rotor group and a second rotor group, and one rotor unit in the first rotor group and one rotor unit in the second rotor group are arranged adjacent to each other; a first flow guide plate having a central hole and arranged between two adjacent rotor units, wherein the first flow guide plate includes a first flow guide path therein; and a central shaft passing through a center of the rotor and the cen