BLDC METHOD AND APARATUS FOR CONTROLLING SENSORLESS BLDC MOTOR

摘要

The present invention provides a sensorless control technique which controls a switching angle due to a counter electromotive force in a non-conduction section existing on both sides of a conduction section in a BLDC which has a sinusoidal counter electromotive force and is driven in a 120-degree conduction type. According to the technique of the present invention, the sensorless is implemented based on a counter electromotive force integral to implement the sensorless which is robust in noise. Moreover, a ratio of counter electromotive force integral values is controlled to enable switching section adjustment so as to enable various controls such as a weak field control and the like.