Positioning controller
US6879119B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 29, 2003 |
| Grant date | Apr 12, 2005 |
| Priority date | — |
| Expiry date | Oct 12, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05B2219/43008
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A positioning controller includes a gear mechanism having a rotating gear for positioning a movable member, a brushless motor to drive the rotating gear, and a motor control circuit to rotate a rotor of the brushless motor by sequentially supplying a driving pulse to a plurality of fixed coils of the brushless motor. The motor control circuit includes a present stage number detector to detect a present stage number of the movable member in accordance with an output signal from a magneto-sensitive device of the brushless motor, and a driving pulse generator to generate a driving pulse to rotate the rotor until a target stage number converted from a specified position of the movable member is equal to the present stage number. The controller in an apparatus including a motor driving unit allows positioning of the movable member without using a component for the detection of the position of the movable member.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.