Control system for stepping motors, a method of operating stepping motors, and a method for selecting current patterns for stepping motors
US4215302A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 26, 1978 |
| Grant date | Jul 29, 1980 |
| Priority date | — |
| Expiry date | Jan 26, 1998 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05B19/40
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An open loop control device and method are provided for stepping motors. By energizing a motor so that the rotor motion is the result of a revolving field which is of piecewise constant speed and uniform field strength, the rotor can be brought to a stop at any desired position. Such position can be the same as or different from the conventional full-increment or half-increment detent positions of the motor. This control method and device guarantee that there is no oscillation when the rotor reaches its final position. The field windings are energized in sequential manner and such that the resultant field takes into account the magnetic characteristics of the motor. The revolving field can be initially adapted to produce, in one case, an angular velocity of half the desired speed for purposes of accelerating the rotor. After one-half of a resonant period has elapsed, the rotor is accelerated to the desired speed. At this time, the speed of the field is doubled and the rotor fully synchronized therewith. When the rotor is to be stopped, the field velocity is switched to an angular velocity equivalent to that of the acceleration velocity which is half the constant speed velocity and …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.