Title:
【発明の名称】超音波モータの制御装置
Document Type and Number:
Japanese Patent JP2723333
Kind Code:
B2
Abstract:
A control device for an ultrasonic motor which is suitable for use in controlling the speed of the ultrasonic motor includes an oscillator for generating drive signals of a resonant frequency of the ultrasonic motor; and a drive signal restricting device for turning on and off the drive signals at a fixed duty ratio. The control device further includes a counter in which counted results of the counter are incremented by a first pulse signal whose frequency increases as a target speed of the ultrasonic motor increases, and in which the counted results are decremented by a second pulse signal whose frequency increases as a travel speed of the ultrasonic motor increases; and a duty ratio setting device for causing the duty ratio to increase as the counted results of the counter increase.
Inventors:
TANAKA MASAYUKI
Application Number:
JP9705790A
Publication Date:
March 09, 1998
Filing Date:
April 12, 1990
Export Citation:
Assignee:
ARUPUSU DENKI KK
International Classes:
H02N2/00; H01L41/04; H02N2/14; (IPC1-7): H02N2/00
Domestic Patent References:
| JP318282A | ||||
| JP3190577A | ||||
| JP6318974A | ||||
| JP648876A | ||||
| JP1291676A |
Attorney, Agent or Firm:
Masatake Shiga (2 outside)