A rare-earth hybrid permanent magnet motor with alternating pole local halbach structure

Abstract

The invention discloses an alternating-pole partial HALBACH structure rare-earth hybrid permanent magnet motor. A circular arc-shaped through slot is opened on the outer wall of the rotor, a first NdFeB permanent magnet is placed in the arc-shaped through slot, and a side surface of the rotor is provided with The ferrite permanent magnet is provided with a second NdFeB permanent magnet on the top of the ferrite permanent magnet. A hammer-shaped magnetic barrier is provided on the top of the second NdFeB permanent magnet. The bottom of the ferrite permanent magnet is provided with an annular through slot, and the inner wall of the annular through slot is staggered with a first sector-shaped ferrite permanent magnet and a second sector-shaped ferrite permanent magnet according to the HALBACH structure. The numbers of the ferrite permanent magnets, the first sector-shaped ferrite permanent magnets and the second sector-shaped ferrite permanent magnets are equal. The structure of the invention can not only make full use of the inner space of the rotor to ensure the torque output performance of the motor, but also can effectively improve the utilization rate of the permanent magnet and reduce the cost of the rare earth permanent magnet material of the motor.

Description

technical field [0001] The invention relates to an alternating pole local HALBACH structure less rare earth mixed permanent magnet motor, which belongs to the technical field of permanent magnet motors. Background technique [0002] Rare earth permanent magnet motors with the advantages of high efficiency and high power density are widely used in industrial fields, but the supply of rare earth materials is unstable and the price fluctuates greatly, which has seriously affected the manufacturing cost of permanent magnet motors and hindered the development of rare earth permanent magnet motors. further large-scale applications. Many motor manufacturers have begun to focus on the deep utilization of permanent magnet materials in rare earth permanent magnet motors and even develop permanent magnet motors with zero rare earth. [0003] Non-rare earth ferrite has the advantages of low price and easy availability of materials, and is the most direct solution for the removal of rar...

AI Technical Summary

Problems solved by technology

The stator partitioned hybrid permanent magnet motor proposed in the prior art places the hybrid permanent magnet in the partitioned inner stator, which makes full use of the internal space of the motor. However, there is a double-layer air gap in the motor of this type of structure, which makes the motor structure Complex assembly is not easy

[0005] It can be seen that in the prior art, for rare earth mixed permanent magnet motors, how to reasonably design the structure of the motor, optimize the dosage ratio and placement scheme of different permanent magnet materials to make deep use of permanent magnet materials, and further reduce the rare earth permanent magnet while ensuring the motor capacity. There are still problems to be solved in terms of magnetic performance and other aspects

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