Assembled miniature brushless DC motor

Abstract

The invention provides an assembling type mini-type brushless direct-current motor and relates to a motor. The assembling type mini-type brushless direct-current motor comprises a stator part, a rotor part and a controller. The motor is of an outer rotor type structure and is driven by a two-phase winding; a dead point with a zero torque does not exist and an asymmetrical air gap structure is not needed. A rotor magnetic yoke adopts a spiral laminated structure so that eddy current loss is reduced. A stator iron core part adopts an assembling type closed wire slot structure so that winding and machining of a stator winding are facilitated, a cogging torque can also be eliminated and motor vibration and noises are reduced; the control performance is improved with the motor rotates at a low rotary speed. The motor controller adopts control chips of two common mini-type single-phase brushless direct-current draught fans and has the advantage of low cost. Compared with a common mini-type single-phase brushless direct-current draught fan, the magnetic field distortion in an air gap of the motor is reduced, the magnetomotive force harmonic loss of the stator is small, the output torque is large and the efficiency of the motor is high.

Description

technical field [0001] The invention relates to an assembled miniature brushless direct current motor, which relates to a motor, in particular to an outer rotor brushless direct current motor whose stator core adopts an assembled closed slot structure. Background technique [0002] Ordinary miniature single-phase brushless DC fans used for ventilation and cooling of computer and electronic equipment chassis are widely used. The development of its controller chip technology is relatively perfect, and the price of the controller chip is also relatively low. For example, the market unit price of the US79KUA controller chip is low. to below binary. Ordinary miniature single-phase brushless DC fan has an output power of only 1W, an efficiency of about 30%, and an external rotor structure. The rotor yoke of ordinary miniature single-phase brushless DC fans is processed into a cylindrical shape with a whole piece of magnetically conductive material, and the pulsation of the stator...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the disadvantages of ordinary miniature single-phase brushless DC fans that the output torque is small and the efficiency of the motor cannot be improved, and overcome the disadvantages of motor vibration, noise and difficulty in controlling the motor at low speed caused by the cogging torque of ordinary brushless DC motors , providing an outer rotor brushless DC motor with an assembled closed slot structure

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