Steering Solutions IP Holding Corporation

Prathima Nuli

Prerit Pramod

Krishna Mpk Namburi

Krishna M P K Namburi

A method for controlling a motor drive with passive damping includes: shorting a set of windings of a motor to define a shorted set of windings; determining a short circuit current in the shorted set of windings; determining, based on the short circuit current in the shorted set of windings, a braking torque for the shorted set of windings; and commanding, based on an initial torque command and based on the braking torque, an inverter to apply an output voltage to an active set of windings of the motor and thereby causing an output current to be generated in the active set of windings.

Torque capability management for passively damped handwheel actuators

A method for detecting and distinguishing a current measurement gain error and a resistance imbalance in a motor drive system includes: determining a first voltage command signal, a first motor position signal, and a first quadrature-axis current command when the motor is rotating at a first speed; computing, based on the first voltage command and motor position signals, a first demodulated voltage signal; determining a second voltage command signal, a second motor position signal, and a second quadrature-axis current command while the motor is rotating at a second speed that is different than the first speed; computing, based on the second voltage command and the motor position signals, a second demodulated voltage signal; and computing a resistance imbalance flag indicating a resistance imbalance and a current gain error flag indicating a current sensing gain error.

Identification of current gain errors and resistance imbalance in feedback current-controlled synchronous motor drive systems

A method for controller a multiphase electric machine includes, in response to a determination that a phase of the multiphase electric machine is in an open circuit condition, determining a desired torque to be generated by the multiphase electric machine and retrieving, based on the determination that the phase is in the open circuit condition and the desired torque, a set of current values to be applied to each of the other phases of the multiphase electric machine to achieve the desired torque. The method may also include applying respective current values of the set of current values to corresponding ones of the other phases of the multiphase electric machine, the set of current values being determined based on a model of the multiphase electric machine that includes the phase is in the open circuit condition.

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Okemos, MI, United States of America

Prathima Nuli