Patent ID: 9419548
Filing Date: 2016-08-16
CPC Classification: H02P

Claim Text:
1. A method for controlling a brushless, electronically commutated electric motor, the method comprising: rectifying a main AC voltage into an intermediate circuit direct voltage; feeding the direct voltage by an intermediate circuit containing an intermediate circuit capacitor to an inverter which is controlled by a motor control unit feeding and commutating the electric motor; and operating an intermediate circuit switch in the intermediate circuit in a fixed-cycle operation in which the intermediate circuit switch is intermittently disconnected and connected to increase the intermediate circuit direct voltage by multiple steps from an initial voltage up to a predetermined limiting value; wherein the intermediate circuit direct voltage is monitored in respect of its voltage level and is compared with the predetermined limiting value, and on reaching the predetermined limiting value, the intermediate circuit direct voltage is limited to the predetermined limiting value by clocked disconnection and reconnection of the intermediate circuit switch.