Rotor positioning method, positioning device and control system for brushless direct current motor

Abstract

The invention discloses a rotor positioning method, a rotor positioning device and a control system for a brushless direct current motor, wherein the positioning method comprises the following steps:when performing conduction control on the stator windings of the motor according to a preset conduction mode, applying a voltage detecting pulse to different phases of the stator windings of the motorin turn, and obtaining a plurality of times by acquiring a time required for the current value of each phase of the stator windings to reach a preset current value; acquiring a preset time-sector relationship table according to the preset conduction mode; obtaining a sector in which the rotor of the motor is located according to a plurality of times and the preset time-sector relationship table,and obtaining the position of the rotor of the motor according to the sector in which the rotor of the motor is located. Therefore, the position of the rotor of the motor may be quickly and accuratelyobtained without the appearance of the problem of abnormal noise as well as jitter and positioning errors. In addition, the method is simple, and the blind spotless positioning may be realized.

Description

Technical field [0001] The invention relates to the technical field of motor control, in particular to a rotor positioning method of a brushless DC motor, a rotor positioning device of a brushless DC motor and a control system of a brushless DC motor. Background technique [0002] At present, in the field of brushless DC motor sensorless drive control technology, there are two main rotor positioning technologies when the motor is stationary and near zero speed: forced pre-positioning method and pulse positioning method. [0003] Among them, the forced pre-positioning method does not consider the current position of the motor rotor, but energizes the fixed phase of the motor stator winding to make the motor rotor rotate to a predetermined position. However, this method has the following disadvantages: 1) The positioning time is long, which is not suitable for the occasions that require the motor to start quickly; 2) In order to reduce the positioning time or increase the reliability...

AI Technical Summary

Problems solved by technology

For this reason, the first purpose of the present invention is to propose a rotor positioning method for a brushless DC motor, which can not only greatly reduce the time for starting and positioning the motor, but also ensure that the motor will not reverse when starting, and solve the problem of abnormal noise and vibration during positioning. Jitter can also solve the positioning error problem caused by the mismatch between the current waveform and the rotor position during pulse positioning, simplifies the pulse positioning rotor position identification method, and can realize full 360° no blind zone positioning

Images