A rotor structure for improving flux-weakening performance of permanent magnet motor

Abstract

The invention relates to a rotor structure of a permanent magnet motor for improving the performance of magnetic field weakening speed expansion. The rotor body comprises a rotor iron core, a ventilation hole and a permanent magnet. The rotor iron core is carbon steel with high strength, The ventilation holes are uniformly distributed in the rotor core along the circumferential direction, and thepermanent magnet is composed of a V-shaped permanent magnet, a type of permanent magnet and an inverted V-shaped permanent magnet. Three kinds of permanent magnet are sequentially embedded in the rotor core along the radial direction. The technical essentials are that the rotor core is made of high-strength carbon steel, which is favorable for high-speed rotation and expansion of the motor. The ventilation holes are uniformly distributed in the rotor core along the circumferential direction, which is favorable for heat dissipation, preventing permanent magnet demagnetization and facilitating weak magnetic field expansion; Permanent magnet is composed of V-shaped permanent magnet, one-shaped permanent magnet and inverted V-shaped permanent magnet. Three kinds of permanent magnet are embedded in the rotor core in turn along the radial direction to reduce magnetic flux leakage, increase the saliency of the motor and improve the ability of weak magnetic field speed expansion. The rotor structure of the permanent magnet motor of the invention has the advantages of good heat dissipation, compact structure, and strong magnetic field weakening and speed expanding ability of the motor.

Description

technical field [0001] The invention relates to the technical field of motors, in particular to a rotor structure for improving the field-weakening and speed-expanding performance of a permanent magnet motor. Background technique [0002] With the development of my country's social industry and economy and the advancement of science and technology, various automobiles have emerged as the times require. Cars have permeated every corner of our lives, and cars have also become an indispensable means of transportation in our lives. Car ownership and growth rates around the world have always maintained a high level. On average, there is one car for every ten people in the world. In my country, the automobile consumption market is growing at an astonishing rate year by year, and our country has entered the era of automobile power. [0003] Against the backdrop of increasingly severe global energy and environmental issues, the development of new energy vehicles is imperative. T...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a rotor structure that improves the performance of permanent magnet motor for field weakening and speed expansion, so as to solve the problems of difficult magnetic field adjustment, poor field weakening capability and small speed regulation range of existing permanent magnet motors during operation.

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