Method of determining operating parameters for a stepping motor
US4330739A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 29, 1981 |
| Grant date | May 18, 1982 |
| Priority date | — |
| Expiry date | Jan 29, 2001 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R31/34
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A stepping motor system is shown wherein a method is employed for determining the optimum amplitude of the current supplied to the stator winding of the motor. A series of different currents are applied to the motor. First, the stator windings are energized with currents of certain base magnitudes. Then the current in one winding is increased by a small amount and the current in the adjacent winding is decreased by a small amount so that the rotor tends to move towards its new equilibrium position. When the rotor reaches its maximum displacement the current changes in the windings are reversed so that not only will the rotor "hunt" for its new equilibrium position but it overshoots with twice the magnitude. This process continues for certain period of time during which the oscillation magnitudes rapidly grow. In one embodiment, after a maximum amplitude is reached, the current changes are applied out of phase with the oscillations to now try to decrease their amplitude. After another period of time, the current changes are terminated, the residual oscillations are monitored and all oscillations greater than a given amplitude are recorded. As this process can be repeated for differe…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.