Method capable of automatically compensating Hall deviation for suppressing commutation torque pulse of brushless DC motor

The invention relates to a method capable of automatically compensating Hall deviation for suppressing commutation torque pulse of a brushless DC motor. The method comprises the steps of detecting a rising edge transient switch-off phase current of a Hall signal, comparing the transient switch-off phase current with a phase current stable value, placing in a delayed way when the transient switch-off phase current is larger than the stable value, otherwise placing in advance; detecting the rising edge transient switch-off phase current of the Hall signal, and acquiring a delay angle Theta according to an expression of the switch-off phase current and delay time t; detecting a time interval of the switch-off phase current reduced to 0 from a stable value, and acquiring an advance degree Theta according to an expression of the time interval and advance time; making time of the switch-off phase current reduced to 0 consistent with time of a conduction phase current raised to the stable value so as to acquire an o