Dynamoelectric machines with shaft voltage prevention method and structure
US5821652A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 28, 1996 |
| Grant date | Oct 13, 1998 |
| Priority date | — |
| Expiry date | Aug 28, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02K11/0141
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Damaging shaft voltages in an induction motor are prevented by an electrostatic shield between the stator winding structure and the rotor structure. The electrostatic shield is held at the same potential as the grounded motor frame. The shield includes an aluminum strip in each winding slot, with one strip in firm engagement with the stator core. The strips are flat strips and extend beyond both ends of the slot to the outer end turns of the stator winding. This places that one strip at the ground reference potential of the motor frame. All strips are connected to the one grounded strip by an end ring. All others are insulated from the core. The strips are connected at only one end to avoid a squirrel cage winding affect.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.