DC brushless motor commutation method

Abstract

The invention discloses a DC brushless motor commutation method comprises detecting, by using a stall detector, whether a DC brushless motor stalls in the vicinity of the start point or end point of an S-curve trajectory and fails to satisfy required positioning accuracy [epsilon]; then controlling the commutation of the motor based on the output signal of the stall detector; if the motor is in astalled state and cannot achieve the required positioning accuracy, performing advance commutation in the current control cycle in order that a resultant magnetic field generated by a stator winding has a 60-degree electrical angle ahead of the motor's desired direction relative to a resultant magnetic field generated in a normal commutation scheme, so as to drive a rotor permanent magnet to rotate again; otherwise, performing normal commutation during the current control cycle. The method solves the problem that the DC brushless motor, when approaching a target angle according to the S-curvetrajectory, stalls in the vicinity of the start point and the end point and cannot reach the required positioning accuracy.

Description

technical field [0001] The invention relates to the field of motor control, in particular to a phase commutation method of a DC brushless motor. Background technique [0002] Brushless DC motors not only have the advantages of traditional DC motors, such as good mechanical characteristics and speed regulation characteristics, large starting torque, strong overload capacity, convenient adjustment, good dynamic characteristics, etc., but also have the advantages of simple structure of AC motors, reliable operation, It has a series of features such as easy maintenance, so it has been widely used in many high-tech fields, such as laser processing, robots and CNC machine tools. [0003] Current research on BLDC motors rarely addresses the low-speed performance of BLDC motors. When the brushless DC motor is running at high speed, it is easy to turn over the commutation point under the action of the moment of inertia (ie inertial force) and electromagnetic torque, so that the comm...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the above problems, the present invention provides a brushless DC motor phase commutation method, which effectively solves the problem that the brushless DC motor approaches the target angle according to the S-shaped curve trajectory, and the motor cannot reach the required positioning due to stalling near the starting point and the end point. Accuracy problem, to realize the rapid self-start when the low-speed brushless DC motor is locked.

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