Rotor magnetic element structure and fan motor device

Abstract

The invention provides a magnetic element structure of a rotor and a fan motor device thereof. The fan motor device comprises a stator, wherein the stator comprises a radial magnetic surface and a sensing element located at the lower part of the stator; the magnetic element structure of the rotor comprises a body; the body is formed by staggered arrangement of a plurality of N poles and S poles; a magnetic boundary line is formed between each N pole and the corresponding S pole; each magnetic boundary line comprises a first vertical part and an inclined part; each first vertical part corresponds to the radial magnetic surface of the stator; each inclined part obliquely extends from the lower end of the corresponding first vertical part and corresponds to the sensing element, so that vibration generated in commutation of the magnetic poles is reduced; and the sensing element can find out the optimal commutation point.

Description

【Technical field】 [0001] The invention relates to a magnetic element structure of a rotor, in particular to a magnetic element structure applied to a rotor of a fan motor. 【Background technique】 [0002] Generally, the basic structure of a brushless DC fan motor can be divided into a stator and a rotor. Because the rotation of the motor is made by the interaction of two magnetic field bodies, it is basically two parts that can be manufactured. The source of the magnetic field, basically the two sources that can produce the magnetic field are designed with electromagnets and permanent magnets, and the design of the electromagnets and permanent magnets can be roughly divided into two parts: static and rotating. The part is called the stator, which includes the shaft, the armature core and the armature winding. The main function is to generate a magnetic field to interact with the magnetic field of the external permanent magnet to generate torque. The rotating part is called t...

AI Technical Summary

Problems solved by technology

However, at present, the magnetization method of the permanent magnet of the rotor is positive magnetization (the slope is zero) or oblique magnetization. The more commonly used positive magnetization needs to match the position of the moving Hall element to find the best efficiency point, but it is often limited by the mechanism. Due to the above limitations, the best commutation point cannot be obtained, resulting in vibration. Therefore, ramp magnetization is used to improve the vibration during commutation, but the efficiency of the motor is sacrificed, resulting in poor motor rotation efficiency.

[0004] To sum up, the current design has the problem of improving vibration and improving performance, which is difficult to achieve the best of both worlds.

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