Ferrite motor

Abstract

The invention provides a ferrite motor. The ferrite motor comprises a stator and a rotor which are coaxially sleeved with each other; the rotor comprises a rotor iron core provided with a plurality of grooves and permanent magnetic ferrites arranged in the grooves; the rotor iron core is composed of a plurality of soft magnetic units which are installed on an installation frame and are the same in shape and size; The installation frame is made of a non-magnetic material and is of a hollow cylindrical structure, the soft magnetic units are mounted on the outer surface of the cylindrical structure to form radial distribution with the central axis of the cylindrical structure as the axis, and the grooves are formed between the adjacent soft magnetic units; and the grooves are the same in shape and size and are distributed in the radial direction with the center axis of the cylindrical structure as the axis. Compared with the prior art, the ferrite motoris low in cost, easy to process and manufacture and high in air gap magnetic flux density; the air gap magnetic flux density can be improved to be more than 0.8 T especially when the radial length of the permanent magnetic ferrites is preferably controlled to be more than two times of a polar distance through magnetic circuit design, and thus, the output torque of the ferrite motor is improved.

Description

technical field [0001] The invention belongs to the technical field of motors, and in particular relates to a low-cost ferrite motor. Background technique [0002] A permanent magnet motor generally includes a stator and a rotor coaxially socketed. The stator includes a stator core and a plurality of windings wound on the stator core. The rotor includes a rotor core and magnets. The magnets are generally made of rare earth permanent magnet materials, but the high price of rare earth permanent magnet materials affects the application and promotion of permanent magnet motors. [0003] Compared with rare earth permanent magnet materials, ferrite permanent magnet materials have low cost, good corrosion resistance, good temperature resistance, and small eddy current loss. Therefore, in order to reduce the cost of the motor, a method for replacing at least part of the rare earth permanent magnet material with a ferrite permanent magnet material in a permanent magnet motor is pro...

AI Technical Summary

Problems solved by technology

Motors with low speed and high torque usually have a large rotor core size, so the punching dies for making the silicon steel sheets are large in size, which greatly increases the processing cost on the one hand, and on the other hand, due to the small size in the actual stamping process Larger increases the difficulty of manufacturing, which affects the yield rate and is not conducive to actual processing and manufacturing

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