US Patent No. 10,171,019

CONTROLLER FOR POWER CONVERTER


Patent No. 10,171,019
Issue Date January 01, 2019
Title Controller For Power Converter
Inventorship Yang Xu, Madison, MI (US)
Ryo Iida, Tokyo (JP)
Robert D. Lorenz, Madison, WI (US)
Yukai Wang, Albany, NY (US)
Assignee Toshiba Mitsubishi-Electric Industrial Systems Corporation, Tokyo (JP) Wis...

Claim of US Patent No. 10,171,019

1. A controller for a power converter configured to drive a motor, the controller comprising:a torque command value calculation module configured to calculate a torque command value based on a speed command value of the motor;
an output voltage controlling module configured to control an output voltage of the power converter based on the torque command value calculated by the torque command value calculation module;
a voltage command value correcting module configured to correct a voltage command value to the power converter based on the measured output voltage from the power converter;
a flux estimation module configured to calculate estimate values of the stator flux and rotor flux of the motor in a subsequent control period based on the voltage command value corrected by the voltage command value correcting module and a measured current value of the stator; and
a motor speed estimation module configured to calculate an estimate value of a speed of the motor in a subsequent control period based on the estimate value calculated by the flux estimation module,
wherein the flux estimation module further comprises:
a current observing module configured to calculate an estimate value of the stator current in a subsequent control period based on the voltage command value corrected by the voltage command value correcting module and the measured stator current value;
a first flux estimation module configured to calculate an estimate value of the rotor flux of the motor based on an estimate value of an electrical angle of the motor and the measured stator current value; and
a second flux estimation module configured to calculate estimate values of the stator flux and rotor flux in a subsequent control period based on the voltage command value corrected by the voltage command value correcting module, the estimate value calculated by the current observing module and the measured stator current value.