Braking method, braking circuit and speed control apparatus for a DC motor
US4633154A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 26, 1984 |
| Grant date | Dec 30, 1986 |
| Priority date | — |
| Expiry date | Nov 26, 2004 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P3/10
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A braking method for DC motor of the present invention is applied to a pulse-driven DC motor. A counter electromotive force of reverse polarity to driving pulses which is generated by induction at the winding of the DC motor is charged in a capacitor. The charged counter electromotive force is fed to the winding of the DC motor during the time that the driving pulses are not fed to the motor, so that plugging is applied to the DC motor. Thus, an external power source for plugging is not necessary, and power consumption is reduced and the construction of the braking circuit becomes very simple. Also, the driving period and the plugging period have a complementary relationship therebetween, thereby enabling the accurate controlling of the rotational speed of the DC motor with a very simple circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.