Magnetic field presetting circuit for an exciter field winding in an electrical propulsion system for traction vehicles
US4348620A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 15, 1980 |
| Grant date | Sep 7, 1982 |
| Priority date | — |
| Expiry date | Sep 15, 2000 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/72
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A traction vehicle propulsion system comprises a d-c motor and an excitation generator for separately exciting the motor field. Current in the field winding of the excitation generator is normally controlled by a control circuit which is arranged to prevent vehicle misdirection due to control circuit failure modes wherein normal excitation current is not supplied. The control circuit comprises means responsive to an acceleration command signal for temporarily removing the field winding from the normal control circuit and for placing it instead in a biasing circuit comprising low impedance paths to the respective terminals of a direct voltage source, thereby presetting the magnetic field of the field winding in the proper direction to prevent vehicle misdirection upon acceleration from rest.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.