Permanent magnet motor assembly having a device and method of reducing parasitic losses
US6741007B2 · kind B2 · utility
16Cited by
32References
13Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 27, 2001 |
| Grant date | May 25, 2004 |
| Priority date | — |
| Expiry date | Jul 27, 2021 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02K1/27
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A permanent magnet motor assembly for use in a flywheel is disclosed, including a rotor, a stator, and a coil positioned in the stator. One or more magnets is attached to the rotor such that magnetic field lines are directed radially toward the coil for generating torque and thus driving the motor. A shield covers the magnet, preventing the magnetic flux lines from impacting a plate on the stator and causing excess heat and energy losses. The shield can be a cup or a snap-fit ring preferably made of magnetic steel which directs stray magnetic flux lines toward the rotor to be converted into useful work.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.