Variable-airgap Conical PM Machines-Design Approach and Control Strategies-Video

Abstract: In this seminar, variable-airgap conical permanent-magnets (PM) machines are proposed as a one-body solution that could produce linear engagement/disengagement while at the same time providing rotational torque/power for specific applications where the use of complex mechanical systems such as clutches and gear-boxes is required. A specific ground aerospace application is targeted.With an appropriate mechanical fixture/bearing design, this topology of machines can be configured to achieve an axial movement of the rotor while taking advantage of the PM technology to obtain a high level of torque. Due to the conical shape and the appropriate bearing system, the inherent attraction between the machine’s rotor and stator can be exploited such that rotational and axial movements occur simultaneously.

In order to design and size the motor for the considered application, specific rules are outlined, and a two-dimensional approach is proposed to slimmer the reiterative designing procedures.

Control algorithms that allow controlling the tangential and horizontal forces exerted on the rotor surface are described. The control of the horizontal force produced by the motor can be exploited to emulate linear actuation. For the right application, this can provide the required engagement/disengagement without having to resort to a secondary clutching system.