Parker-Hannifin Corporation

Patrick C Toops

Hao Zhang

Steven R Huard

Yu-Sen James Chu

Satish Kumar Raju Kalidindi

Frank Iannizzaro

Suresh Natarajan

Gerard Oustry

David T Blood

Sai Kiran Gunti

Robb Fisher

William Beach

Brian Burgess

A method includes receiving a sine feedback signal and a cosine feedback signal from a resolver coupled to an output shaft of an electric motor. Rectified sine and cosine signals are generated by sampling the feedback signals. A direction of rotation of the output shaft is determined using the feedback signals and the rectified signals. The rectified sine signal and the rectified cosine signal are converted into a signed sine signal and a signed cosine signal, respectively, using information associated with the direction of rotation. A speed of rotation of the output shaft is determined using the signed sine signal and the signed cosine signal. The direction and the speed of rotation are compared to a respective direction and a respective speed determined by a resolver-to-digital converter. The electric motor is operated based on the comparison.

Systems and methods for a resolver and motor control with enhanced speed and direction monitoring

An example assembly comprises: a main housing; an electric motor disposed in the main housing and comprising a stator fixedly positioned in the main housing, and a rotor positioned within the stator; a hydraulic pump positioned in the main housing and at least partially within the rotor, wherein the hydraulic pump is configured to receive fluid from an inlet port and provide fluid flow to an outlet port, wherein the hydraulic pump comprises a pump shaft rotatably coupled to the rotor of the electric motor; a controller housing coupled to the main housing; and a motor controller comprising one or more circuit boards disposed within the controller housing and configured to generate electric current to drive the electric motor.

Electric motor with integrated hydraulic pump and motor controller

Growing community of inventors

Charleston, WV, United States of America

Patrick C Toops