Double-winding and double-phase brushless direct current motor

Abstract

The invention is a double-winding two-phase brushless direct-current motor, which relates to a motor, which includes a stator part, a rotor part and a controller. The number of magnetic poles of the rotor is two poles, the number of slots of the stator is four slots, and the working mode of the stator winding is double winding. The current phase difference of the two-phase windings is 90 degrees electrical angle, there is no dead point where the torque is zero, and there is no need to adopt an asymmetrical air gap structure. No cogging torque. Compared with ordinary miniature single-phase brushless DC fans, the magnetic field distortion in the air gap is small, the stator magnetomotive force harmonic loss is small, the output torque is large, and the motor efficiency is high. The controller adopts two ordinary miniature single-phase brushless DC fan controller chips, and uses an external power switch tube to expand the current driving capability, which has the advantage of low cost. If the number of rotor magnetic poles is two, the angle of the rotor magnetic pole pole arc is large, and the Hall element can track the magnetic pole state of the permanent magnet of the rotor with high precision, and it is not easy to cause out-of-control phenomena.

Description

technical field [0001] The present invention is a double-winding two-phase brushless DC motor, which relates to a motor, in particular to a two-phase brushless DC motor with rotor magnetic poles of two poles, stator slots of four slots, and stator windings of double-winding working mode. brushed DC motor. Background technique [0002] The cost of the controller of the brushless DC motor is relatively high, and the main factors affecting the cost of the controller are the type and production quantity of the controller chip. The stator winding of a single-phase brushless DC motor is divided into a single-winding working mode or a double-winding working mode according to different conduction modes. The former uses an H-bridge circuit and requires four power switch tubes. The latter adopts a non-bridge circuit and only needs two power switch tubes. In a commutation cycle (360 degrees electrical angle), the working mode of single winding is forward conduction in the first half...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the shortcomings of ordinary micro-single-phase brushless DC motors with small output torque and the inability to improve the motor efficiency, and to overcome the disadvantages of relatively large controller costs of ordinary brushless DC motors, and to provide a controller that uses two The controller chip of ordinary miniature single-phase brushless DC fan, the number of motor rotor magnetic poles is two poles, the number of stator slots is four slots, and the stator winding is a two-phase two-winding working mode with low cost, large output torque and high motor efficiency. Brushless DC Motor

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