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

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.