Fractional Delay Adjustment in a Field-Oriented Control Architecture

摘要

A motor controller architecture and method of operating the same. The motor controller includes a function for selecting a fractional delay compensation value to be applied in the estimate of rotor position for which pulse-width-modulated drive signals are to be applied to a multi-phase electric motor. The motor is operated over iterated trial values of fractional delay time, while monitoring a magnitude of a feedback signal in the control loop. The selected fractional delay time is that having a lowest magnitude of the monitored feedback signal.

主权项

1. A method of controlling the operation of a multiphase AC electric motor, comprising:
for each of a plurality of trial fractional delay times, generating pulse-width-modulated drive signals for phases of the motor by performing a plurality of operations comprising:
producing a metric signal responsive to a sensed state of the motor;generating a rotor position estimate at the trial fractional delay time in a next sample period responsive to the metric signal;storing a magnitude value for the metric signal in association with the trial fractional delay time;generating at least one control signal responsive to the metric signal and to at least one input signal;responsive to the rotor position estimate at the fractional delay time in the next sample period, applying a transform to the control signal to produce output control signals; andgenerating the pulse-width-modulated drive signals for each of the phases of the motor responsive to the output control signals; from the stored metric signal magnitude values, selecting a fractional delay time associated with an extreme magnitude value of the metric signal; and then repetitively generating pulse-width-modulated drive signals for phases of the motor by applying the transform to the control signal responsive to rotor position estimates at the selected fractional delay time.