Stepping motor control apparatus
US4882530A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Aug 25, 1988 |
| Grant date | Nov 21, 1989 |
| Priority date | — |
| Expiry date | Aug 25, 2008 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02D2011/103
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
In an all-phase de-energized state of the stepping motor, all motor windings having different phases are energized. After the all-phase de-energized state is detected, the motor windings are sequentially energized in accordance with predetermined phase energization patterns. Each of the energizations of the motor windings lasts for a given interval chosen to allow the stepping motor to generate a starting torque greater than a maximal load torque. After energizations of the motor windings corresponding to one cycle of the phase energization patterns are completed, durations of the energizations of the motor windings are gradually shortened to increase a rotational speed of the stepping motor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.