Electric motor
US6340856B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 9, 2000 |
| Grant date | Jan 22, 2002 |
| Priority date | — |
| Expiry date | Jun 9, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02K11/215
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
In an electric motor, in particular a commutator motor, with a magnet body (24) disposed on a rotor shaft (12) in manner fixed against relative rotation for scanning the revolution and/or rpm, which magnet body has a carrier ring (26), seated with a press fit on the rotor shaft (12), and a multi-pole ring magnet (27) received by the carrier ring, in order to produce the carrier ring of metal for the sake of greater axial force transmission to the rotor shaft (12), the carrier ring (26) is embodied with a first annular portion for the press fit and with a second annular portion (262), adjacent to it in the axial direction, that has an inside diameter for receiving the ring magnet (27) that is greater than the outside diameter of the rotor shaft (12). As a result, the stresses caused by the press fit are not transmitted to the ring magnet (27), which is fragile (FIG. 1).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.