DRIVE CIRCUIT FOR A PERMANENT MAGNET MOTOR

摘要

A drive circuit for an electric motor connected in series with an AC power source (24) between a first node A and a second node B. The drive circuit includes a controllable bidirectional AC switch (26), an AC-DC conversion circuit (28) connected in parallel with the controllable bidirectional AC switch between the first node and the second node, a position sensor (20) configured to detect a position of a rotor of the motor, and a switch control circuit (30) configured to control the controllable bidirectional AC switch (26) to be conductive or non-conductive in a predetermined way, based on the position of the rotor and a polarity of the AC power source.