Ryukichi Kijima

Title: Ryukichi Kijima: Motor and Rotor Innovations

Introduction

Ryukichi Kijima is an inventor based in Tokyo, Japan, whose patent work focuses on motor and rotor designs for compressors and refrigeration and air-conditioning equipment. He is associated with Mitsubishi Electric Corporation and is listed as an inventor on 2 patents.

Latest Patents

Kijima’s recent patent work addresses rotor structures and magnet retention in electric motors.

One patent describes a motor with a stator and an internal rotor. The rotor core contains a magnet insertion hole holding two permanent magnets, along with a magnet-holding portion between them. It also includes an opening positioned radially inward of that holding portion. The design specifies that the distance from the opening to the magnet insertion hole is shorter than the distance from the opening to the rotor core’s center hole.

Another patent concerns a rotor core containing multiple permanent magnets, including two adjacent magnets. The core has a first magnet-holding portion within the magnet insertion hole and a second holding portion at one circumferential end of the hole. Its electromagnetic steel sheets are stacked axially, with the design requiring more total sheets than sheets containing either type of holding portion.

Career Highlights

Kijima’s listed inventions apply to motors, rotors, compressors, and refrigeration and air-conditioning apparatus. His patent contributions reflect engineering work on rotor construction, permanent-magnet positioning, and laminated steel-sheet arrangements.

Collaborations

Kijima’s listed coworkers include Masahiro Nigo and Yuji Hirosawa. His work is associated with Mitsubishi Electric Corporation.

Conclusion

Ryukichi Kijima’s patents focus on practical motor and rotor designs, particularly the placement and retention of permanent magnets in equipment used for compression and climate control.