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access icon free Moving magnet linear actuator with self-holding functionality

© The Institution of Engineering and Technology
Received 10/10/2017, Accepted 08/02/2018, Revised 12/12/2017, Published 14/02/2018

Electromagnetic design of a moving magnet frictionless linear actuator with self-holding functionality for mechanical gear shifting in a transmission application is presented. The actuator consists of a tubular magnetic circuit with stationary armature and axially moving rotating permanent magnet assembly with radial magnetisation in the air gap. The armature contains a two-piece magnetic core with a space for a winding. The effects of armature slot opening and magnetic circuit materials on the self-holding force and the acting force are studied in the whole moving range. The designed moving magnet linear actuator improves the performance of the vehicle by enabling shift times below 50 ms with no energy consumption between the shifts.

Inspec keywords: magnetic actuators; magnetic materials; electromagnetic actuators; magnetic cores; magnetisation; windings; magnetic gears; magnetic circuits; permanent magnets

Other keywords: two-piece magnetic core; radial magnetisation; self-holding force; tubular magnetic circuit; electromagnetic design; axially moving rotating permanent magnet assembly; acting force; self-holding functionality; transmission application; stationary armature; winding; armature slot opening effects; moving magnet frictionless linear actuator; magnetic circuit materials; mechanical gear shifting; air gap

Subjects: Control gear and apparatus; Electromagnetic device applications; Magnetic cores; Magneto-acoustic, magnetoresistive, magnetostrictive and magnetostatic wave devices; Electromagnetic actuators; Permanent magnets

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