Step motor driving apparatus
US6388414B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 6, 2000 |
| Grant date | May 14, 2002 |
| Priority date | — |
| Expiry date | Oct 6, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B9/08
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
In a drive apparatus, an operating member is driven by a step motor under control of a control section in response to a signal from a detection section. The control section sets the operating member to an initial position from a mechanically stopped position by forward rotating the step motor at a predetermined step number. At a time of starting an operation of the operating member from the initial position, the control section temporarily reverse rotates the step motor to move the operating member to a detection zone so that the detecting section may detect the signal when the operating member performs a normal movement. Then, the control section responds to the signal to forward rotate the step motor so as to move the operating member to a target position. At a time of a returning operation to the initial position from the target position, the control section reverse rotates the step motor so as to return the operating member from the target position to the detection zone so that the detecting section may detect the signal when the operating member performs a normal movement. Then, the control section responds to the signal to forward rotate the step motor to move the operating m…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.