Method for the commutation of a brushless direct current motor

Details Method for the commutation of a brushless direct current motor Method for the commutation of a brushless direct current motor

2006-12-05

2006-12-05

Ip, Paul (Department: 2837)

Electricity: motive power systems

Limitation of motor load, current, torque or force

C318S430000, C318S434000

Reexamination Certificate

active

07145303

ABSTRACT:
The invention relates to a method for the commutation of a brushless direct current motor in which the position of the rotor in respect of the stator is determined directly or indirectly and an external operating voltage is applied, at a preset commutation angle, to the at least one motor winding depending on the determined rotor position. In accordance with the invention, the motor is preferably switched periodically back and forth between a second optimized commutation angle and the first, original, preset commutation angle. If a change in rotational speed results from switching between the commutation angles, the new operating point deviates from the old operating point. To compensate for this difference in speed, not only is the pre-commutation angle changed but the motor voltage is also changed.

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