Constant speed dc motor with interior field

Claim 2

A constant speed direct current motor comprising a static field, a rotating armature surrounding the field, a plurality of armature coils, a core piece within each coil, guide means on the armature restraining each core piece for radial motion with respect to the field in response to centrifugal moment of each core piece as the armature rotates, means inhibiting each core piece from radial motion away from the field, power take-off means rotated by the armature, a frame rotatable with the armature, a compression spring extending between each core piece and the frame urging the core piece toward the field against the centrifugal force engendered by armature rotation, and means for varying the spring pressure against the core piece.

Claim 3

A constant speed direct current motor in accordance with claim 1 further comprising an armature ring supporting the armature coils, a commutator ring carried by the armature ring, and cOntact brushes adapted to transfer electrical power to the armature through the commutator.

Claim 4

A compression member or constant speed direct current motor in accordance with claim 2 wherein the commutator comprises a plurality of segments equal in number to the plurality of armature coils.

Claim 5

A constant speed direct current motor in accordance with claim 1 wherein the inhibiting means comprises an elastic band bearing upon the radially outward portion of each core piece.

Claim 6

A constant speed direct current motor in accordance with claim 1 further comprising an armature ring, a segmented commutator ring, a plurality of arcuately spaced coil cores extending radially from the armature ring, each of said core pieces being radially movable within a coil core, a static shaft supporting the field, electrical connectors extending through the shaft to the field and armature, brush supports on the static shaft, and a frame on the armature ring supporting the core pieces inhibiting means, said frame carrying said power take-off means.

Claim 7

A constant speed direct current motor in accordance with claim 6 wherein the commutator comprises a plurality of segments equal in number to the plurality of armature coils.

Claim 8

A constant speed direct current motor in accordance with claim 6 wherein the inhibiting means comprises a plurality of compression springs, a compression spring extending between each core piece and the frame urging the core piece toward the field against the centrifugal force engendered by armature rotation, and means on the frame for varying the spring pressure against the core piece.

Claim 9

A constant speed direct current motor comprising a motor case, end plates on the case, a power take-off axle journalled in one end plate, a static shaft fixed to the other end plate, a static field supported on the shaft, an armature frame journalled on the shaft at one end and supporting the shaft at the other shaft end, said take-off axle supporting the frame at said other shaft end, electrical leads extending from the field through the shaft externally of the case, brush carriers fixed to the shaft, a ring armature journalled on the shaft at one of the ring ends and fixed to the frame at the other ring end, a metal shield on the armature ring interior between ring and field, a commutator on the ring armature, a plurality of armature cores, armature coils about each core linked in series to the commutator, a core piece slidable in each armature core toward and away from the field, a spring extending from the frame to each core piece biasing each core piece toward the field, brushes on the carriers in contact with the commutator, and electrical leads from the brushes extending through the shaft exteriorly of the motor housing.

Claim 10

A constant speed direct current motor comprising a motor case, end plates on the case, a power take-off axle journalled in one end plate, a static shaft fixed to the other end plate, a static field supported on the shaft, an armature frame journalled on the shaft at one end and supporting the shaft at the other shaft end, said take-off axle supporting the frame at said other shaft end, electrical leads extending from the field through the shaft externally of the case, brush carriers fixed to the shaft, a ring armature journalled on the shaft at one of the ring ends and fixed to the frame at the other ring end, a metal shield on the armature ring interior between ring and field, a commutator on the ring armature, a plurality of armature cores, armature coils about each core linked in series to the commutator, a core piece slidable in each armature core toward and away from the field, a spring extending from the frame to each core piece biasing each core piece toward the field, brushes on the carriers in contact with the commutator, and electrical leads from the brushes extending through the shaft exteriorly of the motor housing.