Electric motor
US7518277B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | May 26, 2004 |
| Grant date | Apr 14, 2009 |
| Priority date | — |
| Expiry date | Dec 18, 2024 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02K2201/06
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The vibration and noise excited by the electromagnetic exciting force in the radial direction of an electric motor are suppressed.In an electric motor 100, a rotor 1 is divided into four rotor pieces 3, 4, 5, and 6 for an axial length of 2L of one group of the rotor core, and for example, the four rotor pieces 3, 4, 5, and 6 are ideally 0.29L, 0.71L, 0.71L, and 0.29L in axial length in the axial direction, and permanent magnets 2 of the rotor pieces 3, 4, 5, and 6 are arranged in the circumferential direction so that the phase differences of the electrical angle are 0, π, 0, and π. Further, when an effect is obtained even if the ideal axial length is changed, the tolerance of the aforementioned axial length is ±0.1L.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.