John M Stephenson

Title: Innovations by John M Stephenson in Leeds, GB

Introduction

John M Stephenson, based in Leeds, GB, is a prominent inventor with a remarkable portfolio of seven patents. His innovative contributions, particularly in the field of electrical machines, showcase his dedication to advancing technology and improving machine efficiency.

Latest Patents

Two of his latest patents exemplify his ingenuity in this domain. The first patent, titled "Apparatus and method for controlling an electric machine," describes a controller designed for electronically commutated electrical machines. This controller skillfully manages feedback signals to minimize undesirable parameters such as torque ripple, current, voltage, vibration, or acoustic noise. By computing the amplitude and phase of various harmonics, the controller sequentially injects these harmonics to effectively minimize the targeted parameter, utilizing an optimizing routine to enhance efficiency further.

The second patent, "Apparatus and method for starting a single-phase variable reluctance motor," provides a significant innovation for motor operation. It features a device that prevents the rotor from stopping in a position of zero-developed torque, ensuring reliable starting of the motor. This system includes a ferromagnetic disk-defined vane mounted to the rotatable shaft and incorporates a permanent magnet to facilitate the development of desired starting torque. Additionally, the embodiment merges a Hall-effect sensor with the vane to create an effective rotor position transducer.

Career Highlights

John M Stephenson is associated with Switched Reluctance Drives Limited, where he actively contributes to the engineering and innovation of electric machines. His extensive experience and patent filings reflect his expertise and commitment to his field, marking significant milestones in his career as an inventor.

Collaborations

Throughout his career, John has collaborated with notable individuals such as William Frederick Ray and Raymond Mann. These partnerships have fostered an environment of collective innovation, bolstering the development of new technologies and enhancing the overall outcomes of their projects.

Conclusion

John M Stephenson's inventive spirit and technical aptitude have undoubtedly made a significant impact in the realm of electrical machines. His latest patents not only contribute to technological advancements but also illustrate the importance of ongoing innovation in shaping the future of electric machine control and performance.