Patent ID: 7774148
Filing Date: 2010-08-10
Classification: H02P

Abstract:
1. A method for estimating torque in a motor comprising an internal permanent magnet coupled to a system controller, the method comprising: determining, via a processor, currents and voltages coupled to the motor; determining, via the processor, a rotation speed for the motor; determining, via the processor, a reactive power for the motor based on the currents and the voltages; estimating, via the processor, a first flux orthogonal to an axis of the internal permanent magnet motor based on the currents; estimating, via the processor, a second flux aligned with the axis of the internal permanent magnet motor based on the currents, the rotation speed, the reactive power, and the first flux; estimating, via the processor, a torque for the motor based on the currents, the first flux, and the second flux; and indicating the estimated torque to the system controller.