DC Motor speed regulator
US4328447A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 29, 1980 |
| Grant date | May 4, 1982 |
| Priority date | — |
| Expiry date | Jul 29, 2000 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P7/2913
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A speed regulating circuit which regulates motor speed without the use of a speed feedback signal by adjusting the magnitude of motor current so as to maintain a predetermined relationship between motor voltage and current. A function generator generates a current reference signal as a function of motor terminal voltage. The relationship between terminal voltage and motor current is established by curve fitting of the motor volt-amp family of curves for constant motor speeds. The current reference signal controls a motor current control circuit, preferably a time ratio or chopper circuit in order to adjust motor current and to regulate motor speed. A closed loop current control loop is associated with the chopper circuit for adjusting motor current to the current reference value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.