Method and system to compensate for dynamic DC offset of measured phase current

摘要

A motor control system for determining an offset correction value is provided. The motor control system includes a motor, an inverter, an inverter controller, and a dynamic offset compensation control module. The inverter is configured to transmit the phase current to the motor. The inverter controller determines the phase current to the motor. The dynamic offset compensation control module is in communication with the inverter controller and the motor, and is configured to perform a method at a fixed periodic interval to determine the offset correction value.

主权项

1. A motor control system for determining an offset correction value, comprising:
a motor; an inverter configured to transmit a phase current to the motor; an inverter controller configured to determine the phase current to the motor; and a dynamic offset compensation control module in communication with the inverter controller and the motor, the dynamic offset compensation control module configured to perform a method at a fixed periodic interval to determine the offset correction value, the method comprising:
disabling the inverter controller;measuring the phase current when the inverter controller is disabled to determine a measured phase current, the measuring performed for multiple current readings that are collected over a fixed number of cycles;determining an average value of the multiple current readings;comparing the average value to an initial offset value to determine if the average value is within a specific tolerance range; anddetermining the offset correction value based on the measured phase current.