Electrical apparatus

Claim 2

Electrical apparatus comprising a hollow casing, a cylindrical housing of magnetic material rotatably journalled in said casing, a stator in said housing comprising a slotted annular core and windings thereon, a rotor comprising an electrically conductive winding including at least one turn within said stator and a shaft rotatably supported by the ends of said casing, a core member of magnetic material surrounding said shaft within said rotor winding and having a supporting flange removably piloted in said housing, and a spool type secondary winding on said core member in inductive coupling relation with said rotor winding.

Claim 3

Electrical apparatus as defined in claim 1 wherein the stator windings comprise three Y-connected coils circumferentially distributed on the stator core.

Claim 4

Electrical apparatus as defined in claim 1 wherein the rotor winding consists of a single electrically conductive loop, the axis of which intersects the rotor axis at an acute angle.

Claim 5

Electrical apparatus as defined in claim 1 comprising a bowed ring of resilient material interposed between an annular shoulder in said cylindrical housing and said core member for retaining the latter in the housing.

Claim 6

Electrical apparatus as defined in claim 1 comprising means including an annular wavy spring for axially positioning said cylindrical housing in said casing.

Claim 7

Electrical apparatus as defined in claim 1 comprising means for rotating said housing in the casing including a ring gear mounted on said housing.

Claim 8

Electrical apparatus comprising an arcuate slotted stator of magnetic metal having a plurality of radially inwardly facing poles, a rotor of non-magnetic metal mounted with the peripheral surface thereof adjacent the faces of said poles, a fixed phase winding on the stator consisting of a first pair of oppositely wound coils having equal numbers of turns connected in series and symmetrically disposed with respect to each other on opposite sides of the arcuate center of the stator, and a control phase winding on the stator comprising a second pair of coils having equal numbers of turns wound alike and symmetrically disposed with respect to each other on opposite sides of the arcuate center of the stator and a center coil disposed between the coils of said second pair and symmetrically with respect to the arcuate center of the stator, said center coil and the coils of said second pair being connected in series and the center coil being wound oppositely to the coils of said second pair.

Claim 9

Electrical apparatus comprising an arcuate slotted stator of magnetic metal having a plurality of radially inwardly facing poles, a rotor of non-magnetic metal mounted with the peripheral surface thereof adjacent the faces of said poles, a fixed phase winding on the stator consisting of a first pair of oppositely wound coils having equal numbers of turns connected in series and symmetrically disposed with respect to each other on opposite sides of the arcuate center of the stator, and a control phase winding on the stator comprising a second pair of coils having equal numbers of turns wound alike and symmetrically disposed with respect to each other on opposite sides of the arcuate center of the stator and a center coil disposed between the coils of said second pair and symmetrically with respect to the arcuate center of the stator, said center coil and the coils of said second pair being connected in series and the center coil being wound oppositely to the coils of said second pair.

Claim 10

Electrical apparatus as defined in claim 7 wherein the sum of the lengths of the end turns of said second pair of coils exposed at one side of the stator is approximately equal to the sum of the lengths of the end turns of said center coil exposed at said one side of the stator, whereby the leakaGe magnetic flux emanating from said end turns of said second pair of coils and from said end turns of said center coil will be approximately equal and of opposite polarity.

Claim 11

In an electrical induction motor, a drag cup rotor and a stator adjacent said rotor comprising an arcuate rim core of magnetic material having radially inwardly projecting poles and being symmetrical with respect to a radial plane containing the axis of the rotor, a fixed phase winding on said core consisting of a pair of series connected coils having equal numbers of turns wound in opposite senses and symmetrically disposed with respect to each other at opposite sides of said plane, and a control phase winding on said core consisting of a center coil centrally disposed on said core and two end coils having equal numbers of turns and disposed on opposite sides of said center coil, said center coil being wound in one sense and said end coils being wound in the opposite sense and said center and end coils being series connected.

Claim 12

In an electrical induction motor, a drag cup rotor and a stator adjacent said rotor comprising an arcuate rim core of magnetic material having radially inwardly projecting poles and being symmetrical with respect to a radial plane containing the axis of the rotor, a fixed phase winding on said core consisting of a pair of series connected coils having equal numbers of turns wound in opposite senses and symmetrically disposed with respect to each other at opposite sides of said plane, and a control phase winding on said core consisting of a center coil centrally disposed on said core and two end coils having equal numbers of turns and disposed on opposite sides of said center coil, said center coil being wound in one sense and said end coils being wound in the opposite sense and said center and end coils being series connected.

Claim 13

An induction motor comprising an arcuate stator core of magnetic material comprising four angularly-spaced, radiallyinwardly extending poles, a fixed phase winding comprising two coils connected in series, one said coil being wound in one sense around the two said poles at one side of the arcuate center of said stator core and the other said coil being wound in the opposite sense around the other two of said poles, and a control phase winding comprising a pair of coils wound in one sense on the end poles of said stator and a center coil wound in the opposite sense around the two center poles of the stator, said center coil and the coils of said pair being connected in series.

Claim 14

An induction motor comprising an arcuate stator core of magnetic material comprising four angularly-spaced, radiallyinwardly extending poles, a fixed phase winding comprising two coils connected in series, one said coil being wound in one sense around the two said poles at one side of the arcuate center of said stator core and the other said coil being wound in the opposite sense around the other two of said poles, and a control phase winding comprising a pair of coils wound in one sense on the end poles of said stator and a center coil wound in the opposite sense around the two center poles of the stator, said center coil and the coils of said pair being connected in series.

Claim 15

In electrical apparatus, an induction servo motor comprising a hollow casing, a shaft rotatably supported in said casing, a drag cup rotor mounted on said shaft for rotation therewith, a stator of magnetic material including an inner core portion mounted in said casing around the shaft and within the drag cup rotor and a multi-pole outer core portion mounted on the casing adjacent the outer periphery of the drag cup rotor, the confronting faces of said inner and outer core portions of the stator being concentric with said shaft and said outer core portion being arcuate and subtending an angle of less than 180*, and fixed phase and control phase windings on said outer core portion.

Claim 16

In electrical apparatus, an induction servo motor comprising a hollow casing, a shaft rotatably supported in said casing, a drag cup rotor mounted on said shaft for rotation therewith, a stator of magnetic material including an inner core portion mounted in said casing around the shaft and within the drag cup rotor and a multi-pole outer core portion mounted on the casing adjacent the outer periphery of the drag cup rotor, the confronting faces of said inner and outer core portions of the stator being concentric with said shaft and said outer core portion being arcuate and subtending an angle of less than 180*, and fixed phase and control phase windings on said outer core portion.

Claim 17

Electrical apparatus as defined in claim 11, wherein said outer core portion is radially slotted to form poles facing said drag cup rotor and said inner core portion, and said fixed and control phase windings are wound on said poles.

Claim 18

Electrical apparatus as defined in claim 12, wherein said fixed phase winding consists of a pair of oppositely wound coils having equal numbers of turns connected in series and symmetrically disposed with respect to each other on opposite sides of the arcuate center of said outer core portion.

Claim 19

Electrical apparatus as defined in claim 12, wherein said control phase winding consists of a pair of similarly wound coils having equal numbers of turns and symmetrically disposed with respect to each other on opposite sides of the arcuate center of said outer core portion and a center coil disposed between the coils of said pair and symmetrically with respect to the arcuate center of said outer core portion, said center coil and the coils of said pair being connected in series and the center coil being wound oppositely to the coils of said pair.

Claim 20

Electrical apparatus as defined in claim 12, wherein said outer core portion of the motor stator has four arcuately spaced poles symmetrically disposed with respect to the arcuate center thereof and including two end poles and two central poles therebetween, and said fixed phase winding consists of two oppositely wound coils connected in series each comprising the same number of turns and each wound on a pair of said poles consisting of one end pole and one central pole.

Claim 21

Electrical apparatus as defined in claIm 15, wherein said control phase winding consists of two like wound coils having equal numbers of turns each wound on a said end pole and an oppositely wound center coil wound on said central poles as a pair, said coils of the control phase winding being connected in series.

Claim 22

Electrical apparatus as defined in claim 11, wherein said fixed and control phase windings are in substantial structural and electrical symmetry with respect to the arcuate center of the motor stator.

Claim 23

Electrical apparatus as defined in claim 11, wherein said fixed phase winding is constituted by two series connected oppositely wound coils having equal numbers of turns and disposed symmetrically with respect to each other on opposite arcuate halves of said outer core.

Claim 24

Electrical apparatus as defined in claim 11, wherein said control phase winding is constituted by a center coil wound in one sense and centrally disposed on said outer core and a pair of coils having equal numbers of turns wound in a sense opposite to that of said center coil and disposed symmetrically with respect to each other on opposite halves of said outer core, said center coil and the coils of said pair being connected in series.