Circuit for shaping and making use of armature current ripple as generated by a D.C. motor, in particular for position control
US4924166A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 14, 1989 |
| Grant date | May 8, 1990 |
| Priority date | — |
| Expiry date | Mar 14, 2009 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P7/2855
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The present invention provides a circuit for shaping ripple in the armature current of a D.C. motor. The circuit includes a phase-locked loop (100). In addition, the circuit preferably includes a back-e.m.f. circuit (300) suitable for generating a signal proportional to the back-e.m.f. of the motor and for controlling the frequency of the phase-locked loop (100) on the basis of the signal obtained in this way and/or the back-e.m.f. circuit (300) suitable for generating a signal proportional to the back-e.m.f. of the motor, a voltage controlled oscillator (500) controlled by the signal proportional to the back-e.m.f., and a switched capacitor filter (400) controlled by the output of the oscillator (500), the filter being connected upstream from the phase-locked loop (100).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.