Patent ID: 8803454
Filing Date: 2014-08-12
Classification: H02P

Abstract:
1. A method for sensorless torque control by determining a rotor position using terminal voltages and currents of an ironless permanent-magnet machine to perform sensorless motoring and/or generation operations, comprising: obtaining instantaneous terminal voltages of the machine; transforming the instantaneous terminal voltages to a zero direct axis voltage and a non-zero quadrature axis voltage; filtering the transformed instantaneous terminal voltages; regulating the electrical frequency of the permanent-magnet machine such that the zero direct-axis voltage is adjusted to have a value of zero; determining a non-final electrical angle of the permanent-magnet machine by applying an integrator to the regulated electrical frequency of the machine; determining a final electrical angle of the of the machine by integrating the non-final electrical angle and an electrical angle from a previous calculation cycle; and regulating the current vector of the machine such that the current vector is perpendicular to the final electrical angle of the machine, thereby optimizing the torque of the machine.