Ac motor

Claim 2

A synchronous motor comprising: a stator having a pair of poles; means for producing a rotating single phase magnetic field between said poles; a rotor rotatably mounted on an axis between said poles, said rotor including a plurality of washer-like members each having a plurality of annularly disposed openings; said plurality of washer-like members disposed with corresponding openings in registration; a squirrel-cage assembly including end members and portions extending through said washer openings, said assembly being formed of a cast conductive metal having said end members integrally formed with said portions extending through said washer openings; and said rotor having only first and second groups of said washerlike members with the peripheral shape of each group defining a differing outer surface contour of said rotor, each of the members of said first group including arcuate peripheral portions concentric with said rotation axis interconnected by further peripheral portions in non-concentric and non-radial relation with said rotation axis, and each of the members of said second group having all peripheral portions arcuate and substantially concentric with said rotation axis to provide starting torque for said motor, and said concentric and nonconcentric peripheral portions of all of said first group members being disposed with corresponding peripheral surfaces in registration.

Claim 3

A synchronous induction motor comprising: a stator having a pair of poles and a first and second auxiliary stator winding: a rotor rotatably mounted on an axis between said poles; a winding wound on said stator and energized by a source of single phase alternating potential to set up a flux field in said stator which passes through said rotor and is divided into a first main flux field and a second flux field delayed by said first and second auxiliary stator windings; said rotor including a plurality of washer-like members each having a plurality of annularly disposed openings; said plurality of washers disposed with corresponding openings in registration; a squirrel-cage assembly including end members and portions extending through said washer openings, said assembly being formed of a cast conductive metal having said end members integrally formed with said portions extending through said washer openings; and said rotor having a first outer surface section providing salient poles for synchronous operation of said motor and a second outer surface section providing a starting band, said first outer surface section of said rotor including portions concentric with said rotation axis and further portions non-concentric with said rotation axis, and said second starting band section of said rotor having all portions substantially concentric with said rotation axis; said starting band being sufficiently close to said first and second auxiliary stator windings such that a sufficient amount of delay flux field passes through said rotor to provide, in combination with the main flux field, a torque which will enable the motor to be self-starting regardless of the initial position of said rotor with respect to said first and second auxiliary stator windings; wherein said rotor first outer surface section has a greater axial length than said rotor second outer surface section.

Claim 4

A synchronous induction motor comprising: a stator having a pair of poles and a first and second auxiliary stator winding: a rotor rotatably mounted on an axis between said poles; a winding wound on said stator and energized by a source of single phase alternating potential to set up a flux field in said stator which passes through said rotor and is divided into a first main flux field and a second flux field delayed by said first and second auxiliary stator windings; said rotor including a plurality of washer-like members each having a plurality of annularly disposed openings; said plurality of washers disposed with corresponding openings in registration; a squirrel-cage assembly including end members and portions extending through said washer openings, said assembly being formed of a cast conductive metal having said end members integrally formed with said portions extending through said washer openings; and said rotor having a first outer surface section providing salient poles for synchronous operation of said motor and a second outer surface section providing a starting band, said first outer surface section of said rotor including portions concentric with said rotation axis and further portions non-concentric with said rotation axis, and said second starting band section of said rotor having all portions substantially concentric with said rotation axis; said starting band being sufficiently close to said first and second auxiliary stator windings such that a sufficient amount of delay flux field passes through said rotor to provide, in combination with the main flux field, a torque which will enable the motor to be self-starting regardless of the initial position of said rotor with respect to said first and second auxiliary stator windings; wherein said rotor first outer surface section has a greater axial length than said rotor second outer surface section.

Claim 5

A synchronous induction motor comprising: a stator having a pair of poles and a first and second auxiliary stator winding; a rotor rotatably mounted on a axis between said poles; a winding wound on said stator and energized by a source of single phase alternating potential to set up a flux field in said stator which passes through said rotor and is divided into a first main flux field and a second flux field delayed by said first and second auxiliary stator windings; said rotor including a plurality of washer-like members each having a plurality of annularly disposed openings; said plurality of washers disposed with corresponding openings in registration; a squirrel-cage assembly including end members and portions extending through said washer openings, said assembly being formed of a cast conductive metAl having said end members integrally formed with said portions extending through said washer openings; and said rotor having a first outer surface section providing salient poles for synchronous operation of said motor and a second outer surface section providing a starting band, said first outer surface section of said rotor including portions concentric with said rotation axis and further portions non-concentric with said rotation axis, said second starting band section of said rotor having all portions substantially concentric with said rotation axis; said starting band being sufficiently close to said first and second auxiliary stator windings such that a sufficient amount of delayed flux field passes through said rotor to provide, in combination with the main flux field, a torque which will enable the motor to be self-starting regardless of the initial position of said rotor with respect to said first and second auxiliary stator windings; wherein said rotor first outer surface section is formed of an aligned first group of washer-like members each having at least two flats, said second outer surface section comprising a circular ring formed of a second group of said washer-like members, said first and second groups being contiguous with said second group disposed adjacent one end of said rotor; and wherein a lip is formed between the flats of said first group of washer-like elements and said second cylindrical group of washer-like elements.

Claim 6

A synchronous induction motor comprising: a stator having a pair of poles and a first and second auxiliary stator winding; a rotor rotatably mounted on a axis between said poles; a winding wound on said stator and energized by a source of single phase alternating potential to set up a flux field in said stator which passes through said rotor and is divided into a first main flux field and a second flux field delayed by said first and second auxiliary stator windings; said rotor including a plurality of washer-like members each having a plurality of annularly disposed openings; said plurality of washers disposed with corresponding openings in registration; a squirrel-cage assembly including end members and portions extending through said washer openings, said assembly being formed of a cast conductive metAl having said end members integrally formed with said portions extending through said washer openings; and said rotor having a first outer surface section providing salient poles for synchronous operation of said motor and a second outer surface section providing a starting band, said first outer surface section of said rotor including portions concentric with said rotation axis and further portions non-concentric with said rotation axis, said second starting band section of said rotor having all portions substantially concentric with said rotation axis; said starting band being sufficiently close to said first and second auxiliary stator windings such that a sufficient amount of delayed flux field passes through said rotor to provide, in combination with the main flux field, a torque which will enable the motor to be self-starting regardless of the initial position of said rotor with respect to said first and second auxiliary stator windings; wherein said rotor first outer surface section is formed of an aligned first group of washer-like members each having at least two flats, said second outer surface section comprising a circular ring formed of a second group of said washer-like members, said first and second groups being contiguous with said second group disposed adjacent one end of said rotor; and wherein a lip is formed between the flats of said first group of washer-like elements and said second cylindrical group of washer-like elements.