Stepping motor control circuit
US4129816A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 10, 1977 |
| Grant date | Dec 12, 1978 |
| Priority date | — |
| Expiry date | Aug 10, 1997 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P8/16
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A stepping motor is described having two operative modes, the first mode being a normal rotary mode and the second a stationary mode. During rotary operation, the induced energy created by interruption of the current flow through the energized phase winding is dissipated quickly by a zener diode connected across the winding. In the stationary mode, a pulsed current is fed to one of the phase windings of the motor to assure stationary positioning of the rotor. During stationary operation, the zener diode is shunted with a second conventional diode providing a low impedance path to the current induced in the phase winding upon de-energization. This low impedance path greatly reduces the energy dissipated during the off condition of the pulsed current thereby greatly reducing motor power requirements during stationary operation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.