Noncontacting signal transfer apparatus

摘要

A noncontacting signal transfer apparatus for a machine apparatus wherein a signal is transferred without direct electric contact between a static unit and a rotatable unit of the machine apparatus comprises a split-core made up of a first core (243) and a second core (244) secured to the static unit and the rotatable unit, respectively, that form, through a gap between the cores, a magnetic circuit the magnetic path length of which does not vary regardless of arbitrary rotation of the rotatable unit and a first coil (245) and a second coil (246) that link with the magnetic flux passing through the magnetic circuit. The first coil (245) is connected to one of either the signal source or the signal processing apparatus established in the static unit, and the second coil (246) is connected to the other of either the signal source or the signal processing apparatus, established in the rotatable unit.