SISTEMA PER IL CONTROLLO DELLA FASE DI UN ELEMENTO ROTANTE

摘要

A phase control system for a rotary member is provided which has a device for adjusting the rotation of a rotary member so as to make the rotational speed and rotary phase of the rotary member coincident for a reference frequency signal. The phase control system has a rotational speed control function to lock the rotary phase of the rotary member at the reference frequency signal without especially providing a device which makes the rotational speed of the rotary member coincident with the reference frequency signal.