Apparatus for removing torque ripples in a direct current motor
US4546294A · kind A · utility
Inventors
Key dates
| Filing date | Feb 6, 1985 |
| Grant date | Oct 8, 1985 |
| Priority date | — |
| Expiry date | Feb 6, 2005 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S388/91
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An apparatus for removing torque ripples comprises a permanent magnet rotor, position sensors, stator armature coils, an operational circuit for effecting an arithmetic operation on detected signals from the position sensors, and a control circuit for driving the stator armature coils. According to another embodiment, an apparatus for removing torque ripples includes a direct-current motor having Y-connected armature coils, a detector for detecting counterelectromotive forces in the direct-current motor, an operational circuit for effecting an arithmetic operation on output signals from the detector, and a transistor for driving the direct-current motor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.