Patent ID: 8314580
Filing Date: 2012-11-20
Classification: H02P

Abstract:
1. Method for controlling a brushless DC motor comprising a stator having stator coils and rotor, wherein a highly reduced reduction gear of an actuating drive is provided for coupling the DC motor to a flap or a valve in order to regulate a gas or liquid volume flow, wherein an electrical current flow in the stator coils is commutated under programme control of a motor control without integral position sensors, comprising the steps of: a) during normal operation, counting motor revolutions of the DC motor by an electronic circuit by checking a polarity of a zero crossing of each of the three phase voltages of the stator coils with BEMF comparators, b) initiating of breaking by generating a signal for telling the motor control that the DC motor should be stopped, c) continuing commutation from the BEMF analysis until rotation speed has fallen below a value of 400 rpm, and d) then, effectuating an immediate stop by algorithms for stopping the rotor so that no counting errors occur.