Electric lawn tractor roll away prevention system
US8983691B2 · kind B2 · utility
0Cited by
11References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 7, 2012 |
| Grant date | Mar 17, 2015 |
| Priority date | — |
| Expiry date | Aug 7, 2032 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/72
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
An electric lawn tractor roll away prevention system includes a brushless DC electric motor powering a traction drive wheel on the electric lawn tractor. The motor is connected to phase wires and provides a back EMF voltage on the phase wires if the electric lawn tractor rolls and turns the traction drive wheel without electric power from the motor. A three phase inverter rectifies the back EMF voltage, turns on the traction controller if the rectified voltage reaches a pre-specified threshold, and applies a voltage to the phase wires to reduce the speed of the electric lawn tractor by regenerative braking.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.