Patent ID: 8398378
Filing Date: 2013-03-19
Classification: B60H,F04D,H02K

Abstract:
1. A fan module assembly comprising: at least one rotatable fan having blades, tips of blades being joined by an annular fan band, an electrically conductive squirrel cage being associated with the fan band to rotate therewith, flux receiving structure associated with the fan band, the flux receiving structure being made of soft magnetic material that can be magnetized but does not remain magnetized, a shroud having a shaft, the fan being associated with the shaft so as to rotate about the shaft and with respect to the shroud, and only one localized, single control structure mounted stationary with respect to the shroud generally adjacent to one portion of the fan band, the single control structure being constructed and arranged to generate a localized and balanced changing magnetic field, generally at a radius of the fan band, which interacts with the flux receiving structure and the squirrel cage to alone cause the fan to be driven by tangential force without the use of permanent magnets.