Stepper motor door control apparatus and method
US4511832A · kind A · utility
14Cited by
1References
8Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 19, 1984 |
| Grant date | Apr 16, 1985 |
| Priority date | — |
| Expiry date | Mar 19, 2004 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T83/54
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A door movement control apparatus and method are provided for opening and closing door apparatus with a stepper motor supplied control pulses in response to a command signal indicating the desired movement direction. A table of time delays for the respective control pulses and resulting motor steps provides a desired speed pattern for the door movement. A comparison of the number of motor steps taken with the number of control pulses provided is made to determine when a closing door is obstructed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.