Process and device for controlling the frequency of a traveling wave motor
US5457362A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 21, 1994 |
| Grant date | Oct 10, 1995 |
| Priority date | — |
| Expiry date | Apr 21, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02N2/142
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
In a method for controlling the frequency of a traveling wave motor, in which an actual value proportional to the actual frequency of the excitation alternating voltage of the traveling wave motor (10) is obtained from the amplitude of an alternating voltage (sense voltage) tapped from the amplitude of a stator (11) of the traveling wave motor (10). The actual value is compared with the desired frequency of the proportional desired value and the excitation frequency is corrected with the deviation which was subjected to suitable control algorithm. In order to stop the traveling wave motor (10) at a stable operating point at maximal performance, the desired value is derived from the amplitude modulation of the sense voltage. This desired value is obtained in a superimposed control loop in which the sense voltage is demodulated, rectified and compared with a predetermined desired amplitude modulation value. The comparative difference is fed to a controller (21), whose control value taken at its output, represents the desired value (1).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.