D.C. motor speed control apparatus having both armature current rate control and zero current deadtime optimized
US4152632A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 13, 1977 |
| Grant date | May 1, 1979 |
| Priority date | — |
| Expiry date | Jul 13, 1997 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S388/917
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A speed control system is disclosed for a direct current motor drive energized by a thyristor armature supply. Voltage regulation for the thyristor supply is through a parallel current controller in which an armature current controller is arranged in parallel with positive and negative rate current controllers, the output of this parallel combination being applied as a voltage control signal to the thyristor supply through a parallel switch which mandates priority of control. Normally, the current controller will determine the thyristor armature supply voltage, but if the armature current rate exceeds a preset current rate reference, the parallel switch intercedes and the appropriate rate current controller takes over control of the thyristor supply voltage. When the thyristor armature supply current rate goes below the rate reference setting, the armature current controller will again resume control of the thyristor supply voltage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.