Patent ID: 8305019
Filing Date: 2012-11-06
Classification: H02P

Abstract:
1. A torque controller for a permanent magnet synchronous motor comprising: an electric power converter for driving the permanent magnet synchronous motor; a current command calculator for calculating two current command values for a q-axis (torque axis) and a d-axis (magnetic flux axis) based on a torque command value; and a vector controller for creating two output voltage command values of the electric power converter for the q-axis and the d-axis based on two differences between the current command value and a detected current value for the q-axis and the d-axis, respectively, to control an output voltage value of the electric power converter; wherein when the output voltage value of the electric power converter reaches a prescribed voltage value, an integration is performed on a difference between the prescribed voltage value and the output voltage value of the electric power converter to obtain an integrated value and the integrated value is used to correct a commanded torque value.