Apparatus and method for controlling the engagement of a gap-type electromagnetic coupling and for alleviating engagement noise
US4567975A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 17, 1984 |
| Grant date | Feb 4, 1986 |
| Priority date | — |
| Expiry date | Feb 17, 2004 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16D2500/7061
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
An apparatus and method is provided for energizing a multiple-turn winding of an electromagnetic coupling having an armature and a rotor separated by an air gap; in response to the closure of the air gap, the energization of the winding is reduced so as to reduce the torque coupling between the armature and rotor. By reducing the initial torque coupling between the armature and rotor the frictional vibrations of the coupling--which occur during engagement of the armature and rotor and which generate audible noise--are reduced and the coupling engages more smoothly and quietly. Preferably, the energization of the winding is reduced in response to the increased magnetic inductance of the winding resulting from the closure of the air gap between the armature and rotor. Also, the torque coupling between the armature and rotor is preferably minimized in response to the increased magnetic inductance so as to provide 100% slippage upon initial contact of the rotor with the armature. From the reduced energization of the winding occurring after the closure of the air gap, the energization of the winding is controlled to gradually increase to full torque coupling and 0% slippage. To further …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.