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Combined Excitation Permanent Magnet Brushless Motor for Electric Vehicles

A permanent magnet brushless motor and combined excitation technology, applied in electric vehicles, motors, vehicle parts, etc., can solve the problems of unstable supply and high cost of rare earth permanent magnet materials, increase the amount of use, reduce the risk of irreversible demagnetization, Effect of improving torque output capability

Active Publication Date: 2018-02-02
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the problems of high cost and unstable supply of rare earth permanent magnet materials, and provide a combined excitation permanent magnet brushless motor for electric vehicles with simple structure, high reliability, high torque and high power density

Method used

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  • Combined Excitation Permanent Magnet Brushless Motor for Electric Vehicles
  • Combined Excitation Permanent Magnet Brushless Motor for Electric Vehicles
  • Combined Excitation Permanent Magnet Brushless Motor for Electric Vehicles

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Embodiment Construction

[0031] see figure 1 , The present invention is a rare earth combined excitation wide speed-regulating permanent magnet brushless motor, which adopts an outer stator structure and includes a stator 1, a rotor 2 and a rotating shaft 10. The rotor 2 is coaxially located inside the stator 1 , and the center of the rotor 2 is used for arranging the rotating shaft 10 . There is an air gap between the inner wall of the stator 1 and the outer wall of the rotor 2, and the thickness of the air gap is related to the power level of the motor, the selected permanent magnet material, and the processing and assembly process of the stator 1 and rotor 2. Both the stator 1 and the rotor 2 are formed by laminating silicon steel sheets with a thickness of 0.35mm, and the lamination coefficient is 0.95.

[0032]The inside of the rotor 2 is embedded with inner and outer two layers of permanent magnets, the inner and outer layers of permanent magnets are evenly arranged along the circumferential di...

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Abstract

The invention discloses a hybrid excitation permanent magnet brushless motor for an electric vehicle. A rotor is internally embedded with an inner layer of permanent magnetic steels and an outer layer of permanent magnetic steels distributed uniformly along the circumferential direction; V-type NdFeB permanent magnetic steels are in the outer layer; spoke-shaped ferrite permanent magnetic steels are in the inner layer; the two kinds of permanent magnetic steels are located on the same pole; the NdFeB permanent magnetic steels and the ferrite permanent magnetic steels are symmetrical about the central axis of the pole; the V-type openings of the NdFeB permanent magnetic steels face the ferrite permanent magnetic steels; each NdFeB permanent magnetic steel is composed of a first NdFeB permanent magnetic steel and a second NdFeB permanent magnetic steel which are the same and are symmetrical about the central axis of the pole; and the top parts of the V-type openings of the NdFeB permanent magnetic steels and the outer ends of the ferrite permanent magnetic steels are directly fixedly connected. by adopting a rare earth permanent magnetic steel and ferrite hybrid excitation mode, parallel connection of the two kinds of permanent magnetic steel main magnetic circuits is realized, and torque density and power density of the motor are further improved.

Description

technical field [0001] The invention belongs to the technical field of motor manufacturing, in particular to a permanent magnet brushless motor suitable for applications such as electric vehicles that require high torque density, high power density, and high-efficiency drive performance. Background technique [0002] High-performance permanent magnet brushless motors have been successfully used in automotive drive systems due to their small size, high torque density, high power density, high efficiency, and good dynamic response. However, due to the rising price of rare earth permanent magnet materials in permanent magnet brushless motors and the increasingly unstable supply chain, the development of permanent magnet brushless motors has been seriously hindered. In order to reduce the manufacturing cost of the motor without affecting the torque output of the motor has become a current research hotspot, non-rare earth motors and combined excitation motors have emerged. [00...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02K1/27H02K1/14H02K3/12
CPCY02T10/64
Inventor 全力顾玮玮朱孝勇杜怿
Owner JIANGSU UNIV
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