Yasushi Maejima

Title: Yasushi Maejima: Innovator in Magnetic Bearing Technology

Introduction

Yasushi Maejima is a notable inventor based in Narashino, Japan. He has made significant contributions to the field of magnetic bearing technology, holding a total of 2 patents. His work focuses on enhancing the performance and reliability of electromagnetic rotating machines.

Latest Patents

One of Yasushi Maejima's latest patents is a "Magnetic bearing apparatus with radial position correcting electromagnet." This invention addresses the issue of dragging on an auxiliary bearing that can occur in motors near the resonance point of rigid mode during startup. The apparatus includes a radial position correcting electromagnet that applies a short-period voltage multiple times to attract a metal disc, thereby adjusting the radial position of the motor shaft and preventing excessive contact with other components.

Another significant patent is the "Electromagnetic rotary machine having magnetic bearing." This high-speed machine is designed to minimize heat generation due to mutual inductance between the stator and rotor. It features drive windings for generating a rotating magnetic field and position control windings for adjusting the rotor's axial or radial position. The rotor is equipped with cage conductors that form closed circuits, ensuring no mutual inductance occurs between the position control windings and the cage conductors.

Career Highlights

Yasushi Maejima has worked with various companies, including Seiko Instruments Inc. His experience in the industry has allowed him to develop innovative solutions that enhance the functionality of electromagnetic machines.

Collaborations

Throughout his career, Yasushi has collaborated with notable colleagues such as Akira Chiba and Tadashi Fukao. Their combined expertise has contributed to advancements in magnetic bearing technology.

Conclusion

Yasushi Maejima's contributions to the field of magnetic bearing technology demonstrate his innovative spirit and dedication to improving machine performance. His patents reflect a deep understanding of electromagnetic systems and their applications.