Moving Magnet Technologies

Geoffroy Petrement

Guillaume Callerant

A method for controlling a polyphase actuator includes supplying each phase with a periodically varying voltage having a periodic sequence of steps Pthat have a constant duration and an amplitude A, where n corresponds to the rank of the phase and i to the rank of the step. The method further includes determining a target position PCof a rotor of the actuator, in order to define a sinusoidal voltage envelope. The actuator further includes a movable member, a stator equipped with electrical coils and a sensor detecting the mechanical position of the movable member with respect to the stator, as well as a microcontroller. The microcontroller determines, at times T, a mechanical position of a mechanical member, the microcontroller calculates, at each of the times T, a difference between the mechanical position and a target position PCcorresponding to the step Pand the microcontroller calculates a coefficient k as a function of the difference. The microcontroller also weights the amplitude of a power supply applied to the phases by a coefficient k in order to supply the phases with weighted amplitude voltages A*k.

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Besancon, France

Geoffroy Petrement