Patent ID: 9197144
Filing Date: 2015-11-24
Classification: G11B,H02P

Abstract:
1. A method of controlling a 3-phase synchronous motor, wherein the 3-phase synchronous motor comprises a stator, wherein the stator has an electromagnetic winding configuration with three terminals, and wherein the three terminals are connected to a switching circuit, the method comprising: for each of a plurality of iterations and a corresponding one of a plurality of switching combinations of the switching circuit, providing an input voltage across two of the three terminals of the electromagnetic winding configuration, wherein the switching circuit comprises a plurality of switches, wherein the plurality of switches have a respective set of states for each of the plurality of iterations such that the switching circuit is in a different configuration for each of the plurality of iterations; for each of the plurality of iterations, measuring a resultant silent terminal voltage at the third terminal of the electromagnetic winding configuration for which an input voltage was not applied; and subsequent to the plurality of iterations, determining a rotor position of the 3-phase synchronous motor based on the resultant silent terminal voltages of the plurality of iterations.