Single-winding two-phase brushless DC motor

Abstract

The invention provides a single-winding two-phase brushless DC motor and relates to a motor. The single-winding two-phase brushless DC motor includes a stator part, a rotor part and a controller. The motor has two rotor magnetic poles and four stator windings. The stator windings adopt a single-winding working mode. A 90-degree electrical degree is between two winding current phases, so that no zero-torque dead point exists and no asymmetric air gap structure is needed. An annular pole shoe is arranged in the center of the stator iron core. No open gullet exists in a motor air gap, so that no gullet torque exists. Compared with a common mini-size single-phase brushless DC fan, in the air gap, the magnetic field distortion decreases, the stator magnetomotive force harmonic loss is small, the output torque is large and the motor efficiency is high. The controller adopts two controller chips of the common mini-size single-phase brushless DC fan and the drive type of the controller chips belongs to the single-winding working mode, an advantage of low cost is achieved. Since the rotor magnetic pole number is two, the rotor magnetic pole arc angle is large. The precision of a Hall element in tracking the magnetic pole state of a rotor permanent magnet is high and an out-of-control phenomenon is prevented.

Description

technical field [0001] The present invention is a single-winding two-phase brushless DC motor, which relates to a motor, in particular to a two-phase brushless DC motor with two poles in the rotor, four windings in the stator, and a single-winding working mode for the stator winding. brushed DC motor. Background technique [0002] 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 cycle and reverse conduction in the second half cycle. The working mode of the double winding is that one winding is turned on in the first half of the cycle, and the other winding is turned on i...

AI Technical Summary

Problems solved by technology

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

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