Control method for brushless electric motor, especially fan motor, in which motor is operated as brushless DC motor during acceleration phase and as synchronous motor during constant speed phase

摘要

Control method for a brushless electric motor (1), especially a fan motor with a permanent magnetic rotor, a wound stator and a and control circuit for generating a varying stator field. In an acceleration phase the motor is operated as a brushless DC motor with sensor-free rotor position determination and in a stationary phase the motor is operated with a constant speed as a synchronous motor in a network power frequency independent manner with an electronically produced voltage without measurement or consideration of the rotor position. The invention also relates to a corresponding control system for a brushless electric motor.