Electric motor having a multipole rotor and a multipole stator

Electrical generator or motor structure – Dynamoelectric – Rotary

Reexamination Certificate

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C310S087000, C310S088000

Reexamination Certificate



An electric motor is provided with rotor and stator. The stator includes stator poles radially facing the rotor and surrounded by stator windings. An insulating sleeve is positioned between the rotor and stator. The sleeve includes projections arranged radially with respect to the rotor. The projections project in a direction away from the sleeve and rotor and towards the stator. The projections project between adjacent stator poles and may further serve to anchor the poles. The projections may have a T or elongated T shape. The projections and sleeve are rigid and either or both may be made of plastic. The sleeve provides a moisture or liquid tight insulation for the stator so that the motor can be used in moist or liquid environments.

patent: 3754844 (1973-08-01), Nusser et al.
patent: 4227108 (1980-10-01), Washizu et al.
patent: 5034643 (1991-07-01), Trian
patent: 5698917 (1997-12-01), Shultz
patent: 5801470 (1998-09-01), Johnson et al.
patent: 5923108 (1999-07-01), Matake et al.
patent: 5964028 (1999-10-01), Buse
patent: 6060805 (2000-05-01), Ohtake et al.
patent: 6097125 (2000-08-01), Park et al.
patent: 6359353 (2002-03-01), Bevington
patent: 6614140 (2003-09-01), Uemura et al.
patent: 756853 (1970-09-01), None
patent: 520808 (1931-02-01), None
patent: 1931661 (1971-01-01), None
patent: 1763760 (1972-01-01), None
patent: 19846489 (2000-04-01), None
patent: 2 345 387 (2000-07-01), None
patent: WO 01/84609 (2001-11-01), None
Derwent Abstract -De 198 46 489A1: Apr. 13, 2000; Mannesmann VDO AG, D-60388 Frankfurt (Germany).
Abstract -DE 1 763 760; Jan. 13, 1972; Hanning Elektro-Werke Robert Hanning, D-4800 Bielefedl (Germany).
Abstract -DE 520 808; Mar. 14, 1931; Dipl.-Ing. Harry Sauveur, D-Hannover (Germany) and Dipl.-Ing. Walter Fiebig, D-Hannover-Wülfel (Germany).
Abstract -DE 1 931 661; Jan. 21, 1971; Siemens AG, D-1000 Berling und D-8000 München (Germany).
Abstract -BE 756 853; Sep. 30, 1970; Siemens Akteingesellschaft, D-1000 Berling (Germany) und D-8000 München (Germany).


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