Electrical propulsion systems for a vehicle
USRE36454E · kind E · reissue
Assignee
Inventors
Key dates
| Filing date | Jul 10, 1997 |
| Grant date | Dec 21, 1999 |
| Priority date | — |
| Expiry date | Jul 10, 2017 |
Classification
- Technology area (CPC —)General
Abstract
A method and apparatus for preventing overspeed of an electrically powered .[.golf car.]. .Iadd.vehicle .Iaddend.having a shunt wound direct current electric motor with an armature winding and a field winding serially connected to respective switching devices and to a source of on-board direct current electric power. The .[.golf car.]. .Iadd.vehicle .Iaddend.includes a control adapted and connected to regulate the current in each of the armature and field windings for controlling speed in response to an operator's command. The .[.golf car.]. .Iadd.vehicle .Iaddend.incorporates overspeed detect sensing the magnitude of current in each of the armature winding and the field winding and detecting when the current in the armature winding reverses direction. The magnitude of the armature winding current upon such reversal is compared to a preselected value and an overspeed signal generated when the reverse current magnitude exceeds the preselected value. The field current is then controlled, in response to the overspeed signal, to limit the speed of the .[.golf car.]. .Iadd.vehicle .Iaddend.to inhibit the overspeed condition. Additionally, the voltage at the motor armature winding is mon…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.