Electric actuator control apparatus
US5059879A · kind A · utility
12Cited by
22References
8Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 22, 1989 |
| Grant date | Oct 22, 1991 |
| Priority date | — |
| Expiry date | Jun 22, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05B2219/50084
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
When abnormal torque occurs in a valve, water gate, etc., it changes speed of a load shaft in a reduction gears, which is transmitted from a worm to a rotary encoder via a main shaft connected to an electric motor and gears. An electric signal is fed from the rotary encoder to a microcomputer in which the abnormal torque is identified to stop the elctric motor. The microcomputer also identifies a full-opening point and a complete-closing point of the valve to stop the electric motor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.