Phase locked loop motor speed control
US4307324A · kind A · utility
11Cited by
5References
3Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 25, 1980 |
| Grant date | Dec 22, 1981 |
| Priority date | — |
| Expiry date | Mar 25, 2000 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S388/911
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A precision motor speed control system employing a phase locked loop in which the inertial mass of the motor, its tachometer and motor driven devices, such as fly wheels, tape transports, etc., perform the functions of the usual low pass filter and voltage control oscillator.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.