To supply power to a rotating detector without contact, we propose a core-type rotary transformer which consists of a circular coil and excitation coils. The circular coil is attached to a rotating shaft with a detector. And each excitation coil is linked to the circular coil by a core. The advantage of this system is that supply power and efficiency can easily increase by linking multiple excitation coils in parallel to a circular coil. In addition to this, the size of a circular coil can be easily changed, and the accuracy of assembling is not severe.
In this paper, characteristics of the core-type rotary transformer and calculations of its inductance are described by 3 dimensional magnetic analysis based on FEM. The features of this driving circuit and its performance obtained from differential equations are also shown. And these were experimentally confirmed.
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