Load driving apparatus
US4284942A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 16, 1978 |
| Grant date | Aug 18, 1981 |
| Priority date | — |
| Expiry date | Jun 16, 1998 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P23/16
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Load actuating servomechanism apparatus includes dynamic regeneration and a mechanically damped motor-load coupling to equalize and overcome a frequency-varying load/load drive train mechanical resonance. The drive circuitry comprises a per se conventional primary motor speed controlling rate feedback loop including a cascaded rate signal command source, summing error-signal producing node, and loop frequency response shaping filter and driver amplifier for exciting a load driving motor, and a rate tachometer signal feedback element connecting a measure of the motor output speed to a subtractive input of the summing node. To broaden the response band of the primary feedback circuit and accommodate a mechanical resonance otherwise interfering therewith, a secondary, positive feedback path supplements the input rate command with a signal dependent upon motor current, and thus upon motor load. Accordingly, output load drive automatically increases as motor current increases when a load drive retarding mechanical resonance is encountered. Further, the mechanical damping, for example implemented by a slip clutch, lowers the effective Q of the resonance, thereby facilitating load actuati…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.