Control device for ultrasonic motor
US5258694A · kind A · utility
14Cited by
6References
1Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 29, 1992 |
| Grant date | Nov 2, 1993 |
| Priority date | — |
| Expiry date | Apr 29, 2012 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02N2/026
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A control device for an ultrasonic motor for controlling to drive the ultrasonic motor according to a logical AND operation between a control pulse having a duty ratio changing from 100% to 0% according to a moving position of the ultrasonic motor and a driving signal having a resonance frequency of the ultrasonic motor. Accordingly, after starting the ultrasonic motor at a maximum speed, a moving speed of the ultrasonic motor can be gradually reduced until it reaches a target position, and when reaching the target position, the ultrasonic motor can be stopped precisely at the target position.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.