Patent ID: 6333609
Filing Date: 2001-12-25
Classification: H02N,H02P

Abstract:
A drive control device of a vibration type motor in which a periodic voltage is applied to an electro-mechanical energy conversion element to vibrate a vibration member, thereby obtaining a driving force, comprising:a monitor circuit which monitors information about the rotational speed of the vibration type motor;a frequency control circuit which compares the information about the rotational speed monitored by said monitor circuit with information about a target speed, and increases or decreases the driving frequency in order to shift the speed of the motor to the target speed;a driving circuit which generates a periodic voltage having a frequency corresponding to the frequency controlled by said frequency control circuit; anda stop circuit which places said driving circuit in an inoperative state when a difference between the target speed and the speed of the motor is not reduced even by increasing or decreasing the frequency by said frequency control circuit.