Sonar flasher speed control
US3946295A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 29, 1974 |
| Grant date | Mar 23, 1976 |
| Priority date | — |
| Expiry date | Oct 29, 1994 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S388/916
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A sonar flasher motor speed control for driving a D.C. electric motor from a varying voltage source. A rotating magnet and coil system generates a first voltage pulse once each revolution of the motor. A capacitor charged through a series resistor in combination with transistor means controlled by the first voltage pulse to generate a ramp voltage once each cycle. The ramp voltage is compared with a reference voltage by means of a voltage comparator, which generates a control second voltage pulse, whenever the ramp voltage exceeds the reference voltage. Transistor amplifier means responsive to said second voltage pulse increases the motor current during the second pulse so as to maintain the speed of the motor relatively constant.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.