Supply circuit for a traveling-wave piezo-electric motor
US6072265A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 16, 1999 |
| Grant date | Jun 6, 2000 |
| Priority date | — |
| Expiry date | Feb 16, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02N2/147
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Supply circuit for a piezo-electric motor comprising a rotor driven, by friction, by a stator energized by at least two piezo-electric elements (P1, P2) supplied respectively with two alternating voltages (Vp, Va) of like amplitude and phase-shifted by approximately 90.degree. by means of a single source and of a means intended for generating the two phase-shifted voltages. This means consists of a capacitor (C), in series with one of the piezo-electric elements (P2), whose value is chosen so that for a given frequency of the voltage of the source (S), substantially the same voltages and a phase-shift of 90.degree. is obtained. The voltage of the source is advantageously controlled, in frequency, by a processing logic unit (PLU).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.