Rotor structure, permanent magnet assisted synchronous reluctance motor and electric vehicle

Abstract

The invention provides a rotor structure, a permanent magnet assisted synchronous reluctance motor and an electric vehicle. The rotor structure includes a rotor body and an outer permanent magnet. The rotor body is provided with a set of magnetic steel slots, the set of magnetic steel slots includes an outer layer of magnetic steel slots, the outer layer of magnetic steel slots includes a plurality of magnetic steel slot sections, at least two of the plurality of magnetic steel slot sections are along the The radial direction of the rotor body is oppositely arranged and located on both sides of the direct axis of the rotor body. The outer permanent magnet is arranged in the magnetic steel slot section, wherein, the length of the outer permanent magnet positioned in the two oppositely arranged magnetic steel slot sections is L, and the maximum distance between the two oppositely arranged magnetic steel slot sections is C, where 0.8×C≤L. Through the arrangement of the outer magnetic steel grooves of the magnetic steel groove group on the rotor body, more permanent magnets are placed in the unit rotor volume, which generates a larger permanent magnet torque, improves the q-axis inductance of the motor, and increases the efficiency of the motor , reduce the torque ripple of the motor, reduce the vibration and noise of the motor, and improve the demagnetization ability of the motor.

Description

technical field [0001] The invention relates to the technical field of motor equipment, in particular to a rotor structure, a permanent magnet assisted synchronous reluctance motor and an electric vehicle. Background technique [0002] Electric vehicles have the characteristics of energy saving and environmental protection, and have been developed rapidly. In order to achieve the functions of high power density and high efficiency of the existing electric vehicle drive motors, more and more motors use high-performance rare earth permanent magnet motors. Rare-earth permanent magnet motors can achieve high efficiency and high power density, mainly relying on high-performance rare-earth permanent magnets. Currently, NdFeB rare-earth permanent magnets are the most widely used. However, rare earth is a non-renewable resource, the price is relatively expensive, and the price of rare earth fluctuates greatly, resulting in higher production costs of electric vehicle drive motors, w...

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Problems solved by technology

[0003] The main purpose of the present invention is to provide a rotor structure, permanent magnet assisted synchronous reluctance motor and electric vehicle, to solve the problem of low motor efficiency in the prior art

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