US 4,786,834 A · Stator assembly for dynamoelectric machine

Abstract

An adjustable speed inductor type rotating dynamoelectric machine, capable of high speed operation, employs a stator assembly incorporating a spool-like support structure. A central, generally cylindrical portion of the support structure supports field windings while radially oriented end portions of the spool-like structure mount and accurately position a circumferentially distributed plurality of C-shaped armature core elements. Radially directed, angularly spaced grooves in the outer surfaces of the end portions receive legs of the C-shaped armature elements and serve to precisely position these elements in three orthogonal directions. The central portion of the armature-field winding support structure may be made of electrically conductive material to provide a flux shield and dissipate heat. For additional ventilation, cooling ports may be provided in the central portion of the spool-like support which cooperate with extended recesses in a coaxial rotor. The rotating rotor centrifugally propels cooling fluid through said ports into the spaces occupied by the field windings and armature windings.

Claims25

Dependent claims

A stator assembly for a dynamoelectric machine, comprising:

a non-magnetic spool-like structure having a hollow, elongated central portion, said central portion comprising wall means extending about and parallel to a centered longitudinal axis and defining a longitudinal passageway through said central portion for accommodating the insertion of a rotor in said passageway, said spool-like structure having axially spaced end portions that extend radially outward relative to said longitudinal axis from respective ends of said central portion, and a plurality of armature core positioning means disposed, respectively, at angularly spaced locations on each of said end portions;
a field winding coiled about the central portion of said spool-like structure and adapted for connection to a source of direct current;
and
a circumferentially distributed plurality of generally C-shaped, longitudinally extending armature cores supported by the end portions of said spool-like structure, each of said armature cores being secured in position on the end portions of said spool-like structure by said armature positioning means such that each of said armature cores is precisely positioned axially, radially and circumferentially with respect to said longitudinal axis.

1 more element

An inductor type dynamoelectric machine comprising:

non-magnetic armature-field winding support means comprising a hollow spool, said spool having a central, generally cylindrical wall portion concentric with a longitudinal axis extending therethrough and an end portion extending radially outward from each end of said central portion, said central portion of said spool having at least one cooling port located near each end of said central portion and passing through said wall, each end portion having a plurality of radially extending grooves in an axially outermost surface thereof, said grooves being adapted to receive therein a corresponding plurality of C-core elements circumferentially distributed about a periphery of the spool by disposing one leg of a discrete C-core element into one of said grooves at one spool end and the other leg of the same element into a groove located at the other spool end, and further comprising securing means for holding the plurality of C-core elements so disposed;
a stator comprising a field winding coiled about the central portion of the spool and a plurality of C-core armature elements circumferentially distributed about said support means by the aforesaid insertion of core element legs into said grooves, and further comprising armature windings distributively disposed on said C-core elements, said circumferential distribution of C-core elements maintaining a desired gap between radially innermost ends of adjacent C-core elements and between said ends and said longitudinal axis;
and
a unitary rotor of magnetic material disposed coaxially within said hollow spool, said rotor comprising an elongate, cylindrical body at each end of which are formed at least two lobes that are integral, concentric and contiguous with the cylindrical body of said rotor, said lobes being defined by recesses disposed therebetween of sufficient axial extent to communicate with said ports so that the rotor, when rotating, inducts cooling fluid at the rotor ends, draws said fluid inwardly along the rotor recesses and centrifuges said cooling fluid through said ports into contact with said field winding and C-core elements for cooling purposes;
and
bearing means for rotatably mounting said rotor for rotation within said hollow spool.

3 more elements

Dependencies are inferred from the claim text.

Stator assembly for dynamoelectric machine

Life of this patent

Stator assembly for dynamoelectric machine

Life of this patent

Abstract

Claims25