Permanent magnet field motor with radio frequency interference suppressing capacitor
US4323804A · kind A · utility
15Cited by
8References
9Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 14, 1980 |
| Grant date | Apr 6, 1982 |
| Priority date | — |
| Expiry date | Jul 14, 2000 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02K11/0141
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The permanent magnet fields encircling the armature of a direct current motor are encircled by a pair of radially spaced cylindrical metal members separated by a cylindrical dielectric member. One of the metal members and one of the brushes that engages the commutator of the motor are grounded. The other brush and the other cylindrical metal member are connected to a direct current power supply, whereby a capacitor is formed by the three cylindrical members for suppressing radio frequency noise generated by sparking of the brushes at the commutator.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.