Patent ID: 9602029
Date: 2017-03-21
CPC Classifications: H02M,H02P,Y02B

Claim:
1. A method for operating a brushless, rotating electrical machine, which includes at least three phase windings, each of which includes at least one first phase winding terminal and one second phase winding terminal, the phase windings being connected to each other, the method comprising: applying pulse-width-modulated voltage signals separately to each of the individual phase windings; and connecting at least one selected phase winding, at least temporarily, to a constant electrical potential, wherein the pulses of the pulse-width-modulated signals applied to the remaining phase windings are at least temporarily phase-shifted with respect to each other during the period in which the selected phase winding is connected to a constant electrical potential, wherein the pulse-width-modulated voltage signals applied to the remaining phase winding are phase-shifted with respect to each other as a function of the current directions in the remaining phase windings, wherein the pulse-width-modulated voltage signals applied to the remaining phase windings are phase-shifted with respect to each other during the periods in which the currents flowing through the remaining phase windings with regard to an electrical connecting point at which at least two of the remaining phase windings are connected to each other, wherein the pulse-width-modulated voltage signals applied to the remaining phase windings are phase-shifted with respect to each other only during the periods in which the currents flowing through the remaining phase windings have the same current direction with regard to an electrical connecting point of at least two of the remaining phase windings, and wherein the pulse-width-modulated voltage signals applied to the remaining phase windings are temporarily phase-shifted with respect to each other and are temporarily not phase-shifted with respect to each other during the period in which the selected phase winding is connected to a constant electrical potential.