High-torque permanent-magnet motor

Abstract

The invention provides a high-torque permanent-magnet motor. N dual-layer magnetic steel channel grooves are distributed at the periphery of a rotor and are formed by cooperation of inner-layer magnetic steel clamp grooves and outer-layer magnetic steel clamp grooves corresponding to the inner-layer magnetic steel clamp grooves. The inner-layer magnetic steel clamp grooves and the outer-layer magnetic steel clamp grooves are provided with opening ends and closing ends respectively. The inner-layer magnetic steel clamp grooves are enclosed into the outer-layer magnetic steel clamp grooves in half-enclosed manner; magnetic-path channels are arranged between the inner-layer magnetic steel clamp grooves and the outer-layer magnetic steel clamp grooves; and the opening ends of the inner-layer magnetic steel clamp grooves and the outer-layer magnetic steel clamp grooves face a stator. Besides, magnetic steel groups are formed in the inner-layer magnetic steel clamp grooves and the outer-layer magnetic steel clamp grooves respectively; and placing gaps are formed between the adjacent magnetic steels. Because more magnetic steels are installed inside the magnetic steel in the magnetic steel clamp grooves, the torque of the motor is improved and the service life of the motor is prolonged under the circumstance that the motor size is not changed; and the each pole of magnetic flux is increased. Therefore, the gap flux density and the power density of the motor are improved.

Description

technical field [0001] The invention relates to the technical field of motors, in particular to a high-torque permanent magnet motor, in particular to a permanent magnet motor with a multi-layer superimposed magnetic steel rotor structure. Background technique [0002] Due to its small size, light weight, high efficiency, high power density, high torque, and convenient control, permanent magnet motors can be applied to electric vehicle drive motors. [0003] At present, most permanent magnet motors use single-layer laminated magnetic steel rotors, and the magnetic steel slots are V-shaped structures. The V-shaped magnetic circuit structure will cause the magnetic flux per pole of the rotor to be small, resulting in low air gap flux density and power density of the motor. Less intense. In order to improve the torque of the permanent magnet motor with single-layer V-shaped laminated magnets, the conventional method is to increase the size of the motor, thereby increasing the...

AI Technical Summary

Problems solved by technology

However, this method not only greatly increases the volume and weight of the motor, what's more, when the permanent magnet motor with single-layer V-shaped laminated magnets is running, the side of the magnet slot will be concave, which will affect the magnet. the flow of the magnetic circuit, reducing the efficiency of the motor

And as the concave degree of the magnetic steel slot deepens, the damage to the rotor will increase, which will accelerate the scrapping speed of the motor

It can be seen that the single-layer V-shaped stacked magnet steel permanent magnet motor has low torque, while the existing solutions will not only increase the volume and weight, but also reduce the efficiency and reliability of the motor

[0004] Based on this, it is necessary to invent a brand-new permanent magnet motor to solve the problems of low operating reliability, limited capacity expansion, low air gap magnetic density, low power density, and low structural strength of existing permanent magnet motors.

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