Patent ID: 8310189
Filing Date: 2012-11-13
Classification: B60K,B60L,B60Y,H02P,Y02T

Abstract:
1. A method for sensorless control of a permanent magnet motor comprising a plurality of phases, the method comprising the step of determining a sensorless position signal and a sensorless speed signal in a torque-speed plane in response to phase currents corresponding to currents on one or more of the plurality of phases, wherein the step of determining a sensorless position signal and a sensorless speed signal comprises the steps of: determining a low speed error signal in response to a difference in the phase currents, a sensorless position feedback signal, and a sensorless speed feedback signal; determining a high speed error signal in response to the difference in the phase currents, the position feedback signal, and the speed feedback signal; and determining a sensorless position signal and a sensorless speed signal in response to the high speed error signal and the low speed error signal, wherein the sensorless position feedback signal is equivalent to the sensorless position signal and the sensorless speed feedback signal is equivalent to the sensorless speed signal.