Patent ID: 9667185
Date: 2017-05-30
CPC Classifications: H02P

Claim:
1. A method for operating a closed-loop or open-loop controlled electric motor of a fan drive, the method comprising: connecting the motor to an on-board system voltage of a motor vehicle; regulating a motor speed of the motor to a predetermined first desired speed, wherein the motor speed is regulated to a desired speed that is lower in comparison with the first desired speed if the on-board system voltage fluctuates, wherein proceeding from a starting level depending on a course of a voltage drop in the on-board system voltage, a desired speed is reduced first to a transitional or intermediate level and after a first timing element or a first period of time has run out is kept constant at the reduced level, and after the first and/or a second timing element or a second period of time has run out is again set to the starting level.