Direct current motor condition monitoring and exercising system
US6894448B2 · kind B2 · utility
0Cited by
17References
15Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 30, 2003 |
| Grant date | May 17, 2005 |
| Priority date | — |
| Expiry date | Aug 18, 2023 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB66F11/044
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
Hydraulically actuated aerial lift trucks typically have a primary hydraulic pump system driven by the vehicle's engine and a backup pump system driven by a direct current motor. Due to infrequent use of such motors, they are vulnerable to failure due to corrosion of the brush/commutator interface or seizing of the motor bearings. A remote power unit is provided to periodically run the back up motor for brief periods to maintain the motor in running condition. Voltage levels across the motor terminals are monitored for correspondence to failure indicating levels.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.