Rotor for an electronically commutated motor and improved...

Details Rotor for an electronically commutated motor and improved... Rotor for an electronically commutated motor and improved...

2005-01-04

2005-01-04

Bryant, David P. (Department: 3726)

Metal working

Method of mechanical manufacture

Electrical device making

C029S598000, C310S154090, C310S154140, C310S156160, C310S271000, C310S156290

Reexamination Certificate

active

06836954

ABSTRACT:
Rotor for an electric motor that comprises a core (1), segments of a cylinder (5, 6, 7) made of magnetizable materials, a substantially cylindrical retaining wrapper (10) whose end portions are joined to at least a pair of plane elements (8, 9). The rotor also comprises first elastic means (11, 12, 13) having a length that is not smaller than the length of the core and being supported by means (2, 3, 4) that are integrally provided in the core parallelly to the axis of rotation (X) of the rotor, which interfere with contiguous longitudinal edges of the segments of a cylinder so as to keep said segments circumferentially spaced from each other. In a preferred manner, the rotor also comprises second elastic means (21-26) which are adapted to make up for the longitudinal and radial plays of the various parts of the rotor so as to ensure that the outer surface of the segments of a cylinder keeps in contact with the inner surface of the wrapper. The invention further relates to a method for producing the rotor. Use: electronically commutated motors, eg. used to drive hermetic refrigerant compressors. Advantages: facilitates mass production, with a high quality-to-cost ratio.

REFERENCES:
patent: 4412145 (1983-10-01), Voss et al.
patent: 4445060 (1984-04-01), Ruhle et al.
patent: 4636107 (1987-01-01), Casler et al.
patent: 6084330 (2000-07-01), Fisher et al.

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