Drive systems using a. c. motors
US4004203A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 17, 1974 |
| Grant date | Jan 18, 1977 |
| Priority date | — |
| Expiry date | Dec 17, 1994 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/70
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A drive system comprises a brushless multi-phase motor which is supplied with power by way of an inverter including thyristors which are fired by a firing network. The firing network is supplied with information relative to the position of the rotor of the motor, by means of a transducer and this information flows by way of a logic network. Also provided is a current sensing device, a signal from which is passed through a control network to the logic circuit, and the logic circuit acts to modify the signals applied to the inverter in the event that the current flowing in one of the d.c. supply lines to the inverter exceeds a predetermined value for more than a predetermined length of time.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.