VSCF start system with precise voltage control
US5587641A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 2, 1990 |
| Grant date | Dec 24, 1996 |
| Priority date | — |
| Expiry date | Apr 2, 2010 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02N11/04
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The problem of maintaining precision control of a synchronous motor is solved in a motor start control which utilizes an estimate of the amplitude of the fundamental wave component as a feedback value. The motor receives power from a main inverter and an excitation inverter. The inverters are controlled by a control unit which includes a pulse width modulation generator which is responsive to a voltage command and a commutation command to develop switching signals for controlling the switches in the main inverter. At speeds above a preselected minimum speed, the voltage command is developed in a closed loop manner responsive to a feedback signal representing an estimate of the fundamental output of the main inverter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.