Magneto-Mechanical Design of an Electromagnetically Actuated Coaxial Magnet Coupling for Fault Protection

Y. Akcay, O. R. Tweedy, P. Giangrande, M. Galea

Research output: Journal PublicationArticlepeer-review


This paper presents the design process for an electromagnetically actuated coupling disconnection system relying on contactless torque transfer. The device can replace existing mechanical and electromagnetic clutches to provide enhanced protection against over torque conditions resulting from faults in the coupled machines. The novel disconnection system contains a coaxial magnetic coupling (CMC) that can be fully disengaged via an electromagnetic actuator. This system configuration improves the fault performance of magnetic couplings and reduces the losses and maintenance requirements associated with other clutch designs. The end result is a more reliable and versatile coupling solution that can be used in a broad range of machine applications. The design and optimization process builds upon existing knowledge of CMC design to produce a practical device that can transmit a maximum torque of 100 Nm and rotate at a maximum speed of 20,000 RPM. The electromagnetic actuator is tested to ensure the system is capable of disengaging the coupling. An investigation is made into the axial forces present in a CMC when the magnets are separated. It is concluded that decoupling a CMC is practical and achievable with the presented electromagnetic actuator design.

Original languageEnglish
Pages (from-to)2085-2095
Number of pages11
JournalIEEE Transactions on Energy Conversion
Issue number3
Publication statusPublished - 1 Sept 2023
Externally publishedYes


  • Analytical method
  • contactless transmission
  • electromagnetic actuator
  • fault protection
  • magnetic coupling
  • permanent magnet
  • reliability
  • solenoid

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering


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