公开(公告)号：US20200021214A1

公开(公告)日：2020-01-16

申请号：US16457064

申请日：2019-06-28

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Rajan LAKSHMI NARASIMHA ,  David Patrick MAGEE

IPC: H02P6/18 ,  H02P6/185 ,  H02P6/182 ,  H02P21/13 ,  H02P21/32

Abstract: A motor controller includes current measurement circuitry and estimation circuitry. The current measurement circuitry is adapted to be coupled to a motor, and configured to measure current in the motor. The estimation circuitry is coupled to the current measurement circuitry, and includes a memory, current computation circuitry, and summation circuitry. The memory stores coefficients of a function for estimating current related to variation of inductance of the motor. The current computation circuitry is coupled to the memory, and is configured to compute a compensation current value based on the coefficients. The summation circuitry is coupled to the current compensation circuitry, and is configured to generate a position error signal by subtracting the compensation current value from a measured current value generated by the current measurement circuitry.