Company Filing History:
Years Active: 1989-1998
Title: Innovations of John J Williams
Introduction
John J Williams is a notable inventor based in Auckland, New Zealand. He has made significant contributions to the field of motor control technology, holding a total of 10 patents. His work focuses on enhancing the efficiency and performance of electronically commutated motors.
Latest Patents
One of his latest patents is for an electronically commutated motor control system. This invention provides a method and apparatus for controlling the speed of a multi-phase, brushless DC electrically commutated motor (ECM). The system utilizes rotor position information derived from back EMF or Hall effect sensors to commutate voltage to the motor windings. The application of commutating voltages is designed to ensure that the voltage applied to the windings always leads the back EMF generated in the windings by a selected constant lead angle. The motor's speed is controlled by pulse width modulation (PWM) of the voltage applied to the ECM windings. Another significant patent involves methods and apparatus for electronically commutated motor control, which discloses a method of controlling power commutation to an electric motor using back EMF sensing or Hall effect sensors. This innovation allows for the sensing of at least part of the current waveform in one or more motor windings, establishing the appropriate commutation pattern required to control motor parameters such as speed.
Career Highlights
John J Williams is currently employed at Fisher & Paykel Limited, where he continues to innovate in the field of motor technology. His work has been instrumental in advancing the capabilities of electric motors, making them more efficient and reliable.
Collaborations
He has collaborated with notable colleagues, including Frank W Shacklock and Dennis E Smith, contributing to various projects that enhance motor control technologies.
Conclusion
John J Williams is a prominent inventor whose work in electronically commutated motor control has led to significant advancements in the field. His contributions continue to influence the development of efficient motor technologies.