Method of driving vibration wave motor and device for driving the same
US8217598B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Feb 22, 2010 |
| Grant date | Jul 10, 2012 |
| Priority date | — |
| Expiry date | Dec 18, 2030 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02N2/163
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A method of driving a vibration wave motor enables proper frequency control of an AC voltage applied to the motor according to the rotational speed difference between the actual and target rotational speeds of the motor, even if frequency-rotational speed characteristics are not stored in advance. A target rotational speed of a moving member is set. A ratio of an amount of increase or decrease in a rotational speed of the moving member to an amount of update of a frequency of the AC voltage and a rotational speed difference between the target rotational speed and an actual rotational speed of the moving member are calculated. The amount of update of the frequency is calculated by dividing the calculated rotational speed difference by the calculated ratio. The frequency of the AC voltage is updated by using the calculated amount of update of the frequency.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.