Controlled torque drive for a barrier operator
US6995533B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 25, 2003 |
| Grant date | Feb 7, 2006 |
| Priority date | — |
| Expiry date | Jul 25, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02H7/0858
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A controlled torque drive for a motor of a barrier operator including a current sensor coupled to a current conducting path that is in series with the motor. The current sensor is configured to sense the current level in the current conducting path and provide a signal indicative of the current level in the current conducting path to a current controller that restricts the current level to the motor when an obstruction is encountered by the movable barrier. The current controller continues to restrict current to the motor for a period of time while the motor attempts to move the movable barrier through an obstruction. In variations, the current to the motor is limited by an analog current controller, and in other variations, current is limited by a digital current controller.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.