Electric rotating machine

Claim 2

An electric rotating machine comprising, in combination: a thin cylindrical rotor having a pair of rotor poles; a stator pole piece assembly having first and second sets of salient stator poles respectively cooperating with different portions of the rotor, there being not more than two salient stator poles in each of said sets and the stator poles in the respective sets being angularly spaced apart by approximately ninety electrical degrees with at least one of said stator poles subtending an angle of at least about one hundred and twenty mechanical degrees with respect to the axis of said rotor, each of said stator poles being in magnetic flux relationship with said pair of rotor poles; first and second field coils for supplying magnetic flux to the respective sets of salient stator poles; and means for applying current to the first and second field coils to produce a magnetic flux field in each of said sets of stator poles.

Claim 3

An electric rotating machine as defined in claim 1, in which each of said salient stator poles subtends an angle of at least approximately one hundred and twenty mechanical degrees with respect to the rotor axis.

Claim 4

An electric rotating machine comprising, in combination: a thin cylindrical nonsalient pole rotor having a pair of rotor poles; first and second field coils in coaxial relationship with each other and with the rotor; housing means of magnetic material at least substantially enclosing said first and second field coils; a stator pole piece assembly within said housing means and having first and second sets of salient stator poles respectively cooperating with the first and second field coils, there being not more than two salient stator poles in each of said sets and the stator poles in the respective sets being angularly spaced apart by approximately ninety electrical degrees with at least one of said stator poles covering an arc of at least approximately one hundred and twenty electrical degrees and not more than about one hundred and sixty electrical degrees with respect to said rotor poles, each of said stator poles being in magnetic flux relationship with said pair of rotor poles; and means for applying current to the first and second field coils to produce an alternating magnetic flux field in each of said sets of stator poles.

Claim 5

An electric rotating machine comprising, in combination: a thin cylindrical nonsalient pole rotor having a pair of rotor poles; first and second field coils in coaxial relationship with each other and with the rotor; housing means of magnetic material at least substantially enclosing said first and second field coils; a stator pole piece assembly within said housing means and having first and second sets of salient stator poles respectively cooperating with the first and second field coils, there being not more than two salient stator poles in each of said sets and the stator poles in the respective sets being angularly spaced apart by approximately ninety electrical degrees with at least one of said stator poles covering an arc of at least approximately one hundred and twenty electrical degrees and not more than about one hundred and sixty electrical degrees with respect to said rotor poles, each of said stator poles being in magnetic flux relationship with said pair of rotor poles; and means for applying current to the first and second field coils to produce an alternating magnetic flux field in each of said sets of stator poles.

Claim 6

An electric rotating machine as defined in claim 3, in which each of the salient stator poles in the machine is integrally formed with said housing means.

Claim 7

An electric rotating machine as defined in claim 4, in which said housing means includes first and second housing sections each of which substantially encloses one of said field coils.

Claim 8

An electric rotating machine as defined in claim 5, in which each of said housing sections includes two annular housing half-sections each having one stator pole integrally formed therewith.

Claim 9

An electric rotating machine comprising, in combination: a thin cylindrical nonsalient pole rotor having only a single pair of rotor poles and a length to diameter ratio of at least about 2.5 to 1; a stator pole piece assembly having first and second sets of salient stator poles respectively cooperating with different portions of the rotor, there being not more than two salient stator poles in each of said sets and the stator poles in the respective sets being angularly spaced apart by approximately ninety electrical degrees with at least one of said stator poles subtending an angle of at least about one hundred and twenty mechanical degrees with respect to the axis of said rotor, each of said stator poles being in magnetic flux relationship with said pair of rotor poles with a uniform radial air gap between the rotor and all of the stator poles; first and second field coils for supplying magnetic flux to the respective sets of salient stator poles; and means for applying current to the first and second field coils to produce a magnetic flux field in each of said sets of stator poles, the current in one of said field coils being out of phase with the current in the other field coil, to provide said rotor with a self-starting characteristic.

Claim 10

An electric rotating machine comprising, in combination: a thin cylindrical nonsalient pole rotor having only a single pair of rotor poles and a length to diameter ratio of at least about 2.5 to 1; a stator pole piece assembly having first and second sets of salient stator poles respectively cooperating with different portions of the rotor, there being not more than two salient stator poles in each of said sets and the stator poles in the respective sets being angularly spaced apart by approximately ninety electrical degrees with at least one of said stator poles subtending an angle of at least about one hundred and twenty mechanical degrees with respect to the axis of said rotor, each of said stator poles being in magnetic flux relationship with said pair of rotor poles with a uniform radial air gap between the rotor and all of the stator poles; first and second field coils for supplying magnetic flux to the respective sets of salient stator poles; and means for applying current to the first and second field coils to produce a magnetic flux field in each of said sets of stator poles, the current in one of said field coils being out of phase with the current in the other field coil, to provide said rotor with a self-starting characteristic.

Claim 11

An electric rotating machine comprising, in combination: a thin cylindrical nonsalient pole rotor having only a single pair of rotor poles and a length to diameter ratio of at least about 2.5 to 1; first and second field coils coaxially disposed around the rotor in axially spaced relationship with each other; housing means at least substantially enclosing said first and second field coils; a stator pole piece assembly within said housing means and having first and second sets of salient stator poles respectively cooperating with the first and second field coils, there being not more than two salient stator poles in each of said sets and the stator poles in the respective sets being angularly spaced apart by approximately ninety electrical degrees with at least one of said stator poles subtending an angle of at least about one hundred and twenty electrical degrees and not more than about one hundred and sixty electrical degrees with respect to the axis of rotation of said rotor, each of said stator poles being in magnetic flux relationship with said pair of rotor poles with a uniform radial air gap between the rotor and all of the stator poles; and means for applying current to the first and second field coils to produce an alternating magnetic flux field in each of said sets of stator poles, the current in one of said field coils being out of phase with the current in the other field coil, to provide said rotor with a self-starting characteristic.

Claim 12

An electric rotating machine comprising, in combination: a thin cylindrical nonsalient pole rotor having only a single pair of rotor poles and a length to diameter ratio of at least about 2.5 to 1; first and second field coils coaxially disposed around the rotor in axially spaced relationship with each other; housing means at least substantially enclosing said first and second field coils; a stator pole piece assembly within said housing means and having first and second sets of salient stator poles respectively cooperating with the first and second field coils, there being not more than two salient stator poles in each of said sets and the stator poles in the respective sets being angularly spaced apart by approximately ninety electrical degrees with at least one of said stator poles subtending an angle of at least about one hundred and twenty electrical degrees and not more than about one hundred and sixty electrical degrees with respect to the axis of rotation of said rotor, each of said stator poles being in magnetic flux relationship with said pair of rotor poles with a uniform radial air gap between the rotor and all of the stator poles; and means for applying current to the first and second field coils to produce an alternating magnetic flux field in each of said sets of stator poles, the current in one of said field coils being out of phase with the current in the other field coil, to provide said rotor with a self-starting characteristic.

Claim 13

An electric rotating machine comprising, in combination: a thin cylindrical nonsalient pole rotor having only a single pair of rotor poles; first and second field coils coaxially disposed around the rotor in axially spaced relationship with each other; housing means of magnetic material at least substantially enclosing said first and second field coils; a stator pole piece assembly within said housing means and having first and second sets of salient stator poles respectively cooperating with the first and second field coils, there being not more than two salient stator poles in each of said sets and the stator poles in the respective sets being angularly spaced apart by approximately ninety electrical degrees, each of said salient stator poles subtending an angle of at least about one hundred and twenty electrical degrees and not more than about one hundred and sixty electrical degrees with respect to the axis of rotation of said rotor, each of said stator poles being in magnetic flux relationship with said pair of rotor poles with a uniform radial air gap between the rotor and all of the stator poles; means for applying current to the first and second field coils to produce an alternating magnetic flux field in each of said sets of stator poles, the current in one of said field coils being out of phase with the current in the other field coil, the provide said rotor with a self-starting characteristic.

Claim 14

An electric rotating machine comprising, in combination: a thin cylindrical nonsalient pole rotor having only a single pair of rotor poles; first and second field coils coaxially disposed around the rotor in axially spaced relationship with each other; housing means of magnetic material at least substantially enclosing said first and second field coils; a stator pole piece assembly within said housing means and having first and second sets of salient stator poles respectively cooperating with the first and second field coils, there being not more than two salient stator poles in each of said sets and the stator poles in the respective sets being angularly spaced apart by approximately ninety electrical degrees, each of said salient stator poles subtending an angle of at least about one hundred and twenty electrical degrees and not more than about one hundred and sixty electrical degrees with respect to the axis of rotation of said rotor, each of said stator poles being in magnetic flux relationship with said pair of rotor poles with a uniform radial air gap between the rotor and all of the stator poles; means for applying current to the first and second field coils to produce an alternating magnetic flux field in each of said sets of stator poles, the current in one of said field coils being out of phase with the current in the other field coil, the provide said rotor with a self-starting characteristic.

Claim 15

An electric rotating machine comprising, in combination: a thin cylindrical rotor having a pair of rotor poles; a stator pole piece assembly having first and second salient stator poles in magnetic flux relationship with the rotor, each of the stator poles subtending an angle of at least about one hundred and twenty mechanical degrees and not more than about one hundred and sixty mechanical degrees with respect to the axis of said rotor; field coil means for supplying magnetic flux to said salient stator poles; and means for applying current to the field coil means to produce a magnetic flux field in each of said stator poles.

Claim 16

An electric rotating machine comprising, in combination: a thin cylindrical rotor having a pair of rotor poles; a stator pole piece assembly having first and second salient stator poles in magnetic flux relationship with the rotor, each of the stator poles subtending an angle of at least about one hundred and twenty mechanical degrees and not more than about one hundred and sixty mechanical degrees with respect to the axis of said rotor; field coil means for supplying magnetic flux to said salient stator poles; and means for applying current to the field coil means to produce a magnetic flux field in each of said stator poles.

Claim 17

An electric rotating machine comprising, in combination: a thin cylindrical nonsalient pole rotor having only a single pair of rotor poles and a length to diameter ratio of at least about 1.25 to 1; a stator pole piece assembly having only a single pair of salient stator poles, each of the stator poles subtending an angle of between about one hundred and twenty mechanical degrees and about one hundred and sixty mechanical degrees with respect to the axis of said rotor, each of said stator poles being in magnetic flux relationship with said rotor with a uniform radial air gap between the rotor and all of the stator poles; field coil means for supplying magnetic flux to said salient stator poles; and means for applying current to the field coil means to produce a magnetic flux field in each of said stator poles.

Claim 18

An electric rotating machine comprising, in combination: a thin cylindrical nonsalient pole rotor having only a single pair of rotor poles and a length to diameter ratio of at least about 1.25 to 1; a stator pole piece assembly having only a single pair of salient stator poles, each of the stator poles subtending an angle of between about one hundred and twenty mechanical degrees and about one hundred and sixty mechanical degrees with respect to the axis of said rotor, each of said stator poles being in magnetic flux relationship with said rotor with a uniform radial air gap between the rotor and all of the stator poles; field coil means for supplying magnetic flux to said salient stator poles; and means for applying current to the field coil means to produce a magnetic flux field in each of said stator poles.