Protection circuit for stalling protection in commutatorless direct current motors
US4694371A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 3, 1985 |
| Grant date | Sep 15, 1987 |
| Priority date | — |
| Expiry date | May 3, 2005 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P6/14
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A protection circuit for stalling protection in commutatorless direct current motors is driven by Hall generators, in particular Hall IC's. A respective semiconductor circuit element (5, 14) disposed in series with each stator winding (1, 2) is turned on or off in dependence on a control voltage induced in the stator windings (1, 2). The control voltage (U.sub.B) is constituted by the sum of the operating voltage in the unenergized windings (1, 2) and the counter-e.m.f. induced in these windings, whereby, if the sum of these voltages is greater than the operating voltage, the semiconductor circuit element (5, 14) connected to the respective energized winding (1, 2) is turned on, and, if the counter-e.m.f. is zero or falls below a predetermined cut-off value, the respective semiconductor circuit element (5, 14) is turned off.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.