Patent ID: 7808201

Claim:
A circuit for driving a two-phase Permanent Magnet Synchronous Motor (PMSM), the circuit comprising: first, second, and third nodes, each node being a junction between series connected high and low side switches connected across a DC bus; the circuit being adapted to be coupled to a PMSM having first and second windings and a star point at which the windings are coupled to each other, the first winding having a terminal connected to the first node, the second winding having a terminal connected to the second node, and the star point being connected to the third node; and a controller for performing a three-point Pulse Width Modulation (PWM) coupled to a gate of each switch, wherein one of the points is the star point; and wherein the controller operates on the Field Oriented Control (FOC) principle to regulate a speed of the PMSM and includes an outer speed loop and first and second inner current loops; and wherein the first and second inner current loops calculate values of the first and second motor winding voltages v v and v u with respect to the star point of the motor averaged on one switching period of the circuit.