A tunable magnet reluctance actuator is an actuator that combines a hybrid reluctance actuator with a tunable permanent magnet as an alternative source of flux. Semi-static forces can be actuated by changing the magnetization of the magnet, after which a constant force can be generated without dissipating energy. In high-tech applications, this reduces heat dissipation, thereby reducing thermal expansion and increasing precision.

Tuning a magnet requires energy upfront, after which the power output of the combined reluctance actuator may be decreased. Next to semi-static situations where a constant force output is demanded, this may also be beneficial in dynamic applications.

This paper investigates optimal control of such an actuator, identifying the limits where a reduction in heat dissipation is possible. The main focus of this paper is on energy efficiency and dynamic effects while tuning the magnet.
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