Local diffusion motor magnetic steel

Abstract

The invention discloses local diffusion motor magnetic steel which comprises a magnetic steel body. The magnetic steel body is of a cuboid structure; one side, close to an air gap, of the magnetic steel body is provided with two corners; and the corners are used for local diffusion of heavy rare earth elements. According to the invention, according to different demagnetization magnetic field influences on different positions of the permanent magnet, the use amount of the heavy rare earth material is increased for the permanent magnet part which is greatly influenced by the demagnetization magnetic field by adopting a diffusion technology, the use amount of the heavy rare earth material is reduced or no heavy rare earth material is added for the permanent magnet part which is slightly influenced by the demagnetization magnetic field, the use of rare earth resources is reduced while the magnetic steel is ensured not to generate corner demagnetization, so that the magnetic steel is more environment-friendly and low in cost, the requirement that the magnetic steel is not demagnetized in the working process of a permanent magnet motor can be met, the use amount of heavy rare earth materials can be reduced, and the motor cost can be reduced.

Description

Technical field [0001] The present invention relates to the field of electrical, and more particularly to a vehicle permanent magnet motor, particularly a local diffusion motor magnetic steel. Background technique [0002] For the design of the permanent magnet motor, more importantly, it is especially important to consider the reliability of the motor before the performance of the torque, power, efficiency, etc. of the motor. [0003] When the motor is running at a large current, the magnetic steel adjacent to the air gap will first decrease, which in turn leads to a decrease in performance. In order to ensure the performance of the motor, the coercive force of magnetic steel must be improved, so the amount of heavy rare earth elements It has greatly increased; the rare earth resources are limited, in order to save rare earth resources, most of the overall diffusion techniques are used, but for most of the positions of magnetic steel, they do not need such high coercivity, so th...

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Problems solved by technology

[0004] In view of the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a local diffusion motor magnet, which is used to solve the problem of waste of heavy rare earth materials that exist in the existing motor magnets that use the overall diffusion of heavy rare earth elements

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