Dust collector, and starting control method, device and control system of brushless direct current motor

Abstract

The invention discloses a dust collector, and a starting control method, a device and a control system for a brushless direct current motor. The method comprises the following steps: obtaining the current rotor position of the motor; obtaining a current acceleration vector and a current detection vector of the motor from a preset starting commutation table according to the current rotor position;alternately applying Na acceleration vector pulses and Nb detection vector pulses to a stator winding of the motor according to the current acceleration vector and the current detection vector; obtaining a motor current corresponding to the nth acceleration vector pulse to obtain a first current, and obtaining a motor current corresponding to the mth detection vector pulse to obtain a second current; and controlling the motor to perform commutation according to the first current and the second current. According to the starting control method, accurate phase change of the motor in the low-speed operation stage can be achieved, the starting torque is improved, it is guaranteed that the motor is not out of step, and reliability is high.

Description

Technical field [0001] The technical field of motor control of the present invention particularly relates to a starting control method of a brushless DC motor, a starting control device of a brushless DC motor, a control system of a brushless DC motor and a vacuum cleaner. Background technique [0002] At present, in the field of brushless DC motor sensorless drive control technology, there are many methods for detecting the rotor position of the motor. Among them, the back-EMF zero-crossing method is simple, effective and widely used. The basic principle of the back-EMF zero-crossing method is that when the back-EMF of a phase winding of a brushless DC motor crosses zero, the direct axis of the rotor coincides with the axis of the phase winding, so only the zero-crossing point of the back-EMF of each phase winding can be judged. Know the rotor position of the motor. However, when the brushless DC motor is running at low speed, the back EMF of the motor is very small, and the ze...

AI Technical Summary

Problems solved by technology

However, for the control system, open-loop forced commutation is a control blind zone. During the low-speed operation stage of the brushless DC motor, the rotor position of the brushless DC motor cannot be obtained, and the generated torque is small, which is prone to out-of-step phenomena , less reliable

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