Contactless Energy Transfer System

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Contactless Energy Transfer to a Moving Actuator

Jeroen de Boeij, Student Member, IEEE, Elena Lomonova, Jorge Duarte Member, IEEE and
Andr´e Vandenput, Senior Member, IEEE

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Abstract—

In this paper a new topology for contactless energy
transfer is proposed and tested that can transfer energy to a
moving actuator using inductive coupling. The proposed topology
provides long-stroke contactless energy transfer capability in
a plane and a short-stroke movement of a few millimeters
perpendicular to the plane. In addition, it is tolerant to small
rotations. The experimental setup consists of a platform with
one secondary coil, which is attached to a linear actuator and
a 3-phase brushless electromotor. Underneath the platform is
an array of primary coils, that are each connected to a halfbridge
square wave power supply. The energy transfer to the
electromotor is measured while the platform is moved over the
array of primary coils by the linear actuator. The secondary coil
moves with a stroke of 18 cm at speeds over 1 m/s, while up to
33 W power is transferred with 90% efficiency.