US6133662A — Permanent magnet dynamoelectric rotating machine …

Claim 1

Independent Claim 162 words

A permanent magnet electric machine comprising: a stator provided with windings thereon; and a rotor disposed with an air gap between the stator and the rotor, and having a plurality of permanent magnets embedded along a circumference thereof, with spacing between adjacent magnets; wherein a circumferential extent of surfaces of the permanent magnets facing the stator is selected so that an induced voltage in the machine has a waveform which approximates a sinusoidal waveform; and an angle θ whose sides are radii of the rotor passing through opposite circumferential ends of a surface of each permanent magnet facing the stator satisfies one of the expressions: θ≈n×τ.sub.s +α, θ≈n×τ.sub.s +β; θ≈n×τ.sub.s +γ where n is a natural number, τ s is a slot pitch of slots in the stator, α is an angle formed by a tooth, of the stator, β is an angle formed by a slot of the stator, and γ is an angle formed by an opening of each slot.

Claim 2

Dependent Claim 162 words

A permanent magnet electric machine comprising: a stator provided with windings thereon; and a rotor disposed with an air gap between the stator and the rotor, and having a plurality of permanent magnets embedded along a circumference thereof, with spacing between adjacent magnets; wherein a circumferential extent of surfaces of the permanent magnets facing the stator is selected so that an induced voltage in the machine has a waveform which approximates a sinusoidal waveform; and an angle θ whose sides are radii of the rotor passing through opposite circumferential ends of a surface of each permanent magnet facing the stator satisfies one of the expressions: θ≈n×τ.sub.s +α, θ≈n×τ.sub.s +β; θ≈n×τ.sub.s +γ where n is a natural number, τ s is a slot pitch of slots in the stator, α is an angle formed by a tooth, of the stator, β is an angle formed by a slot of the stator, and γ is an angle formed by an opening of each slot.

Claim 3

Dependent Claim 155 words

A permanent magnet electric machine comprising: a stator provided with windings thereon; and a rotor disposed with an air gap between the stator and the rotor, and having a plurality of permanent magnets embedded along a circumference thereof, with spacing between adjacent magnets; wherein a circumferential extent of surfaces of the permanent magnets facing the stator is selected so that an induced voltage in the machine has a waveform which approximates a sinusoidal waveform; each permanent magnet is partially embedded in a core of the rotor and has a portion which projects at least to the circumference of the rotor; and an angle θ whose sides are radii of the rotor passing through opposite circumferential ends of said portion of each permanent magnet which projects at least to the circumference of the rotor satisfies the expression: θ≈(n+0.5)×τ.sub.s where n is a natural number and τ s is a slot pitch of slots in the stator.

Claim 4

Dependent Claim 155 words

A permanent magnet electric machine comprising: a stator provided with windings thereon; and a rotor disposed with an air gap between the stator and the rotor, and having a plurality of permanent magnets embedded along a circumference thereof, with spacing between adjacent magnets; wherein a circumferential extent of surfaces of the permanent magnets facing the stator is selected so that an induced voltage in the machine has a waveform which approximates a sinusoidal waveform; each permanent magnet is partially embedded in a core of the rotor and has a portion which projects at least to the circumference of the rotor; and an angle θ whose sides are radii of the rotor passing through opposite circumferential ends of said portion of each permanent magnet which projects at least to the circumference of the rotor satisfies the expression: θ≈(n+0.5)×τ.sub.s where n is a natural number and τ s is a slot pitch of slots in the stator.

Claim 5

Dependent Claim 121 words

A permanent magnet electric machine comprising: a stator provided with windings thereon; and a rotor disposed with an air cap between the stator and the rotor, and having a plurality of permanent magnets embedded along a circumference thereof, with spacing between adjacent magnets; wherein a circumferential extent of surfaces of the permanent magnets facing the stator is selected so that an induced voltage in the machine has a waveform which approximates a sinusoidal waveform; and an angle θ whose sides are radii of the rotor passing through opposite circumferential ends of a surface of each permanent magnet facing the stator satisfies the expression: θ≈(n+0.5)×τ.sub.s where n is a natural number and τ s is the pitch of slots in the stator.

Claim 6

Dependent Claim 121 words

A permanent magnet electric machine comprising: a stator provided with windings thereon; and a rotor disposed with an air cap between the stator and the rotor, and having a plurality of permanent magnets embedded along a circumference thereof, with spacing between adjacent magnets; wherein a circumferential extent of surfaces of the permanent magnets facing the stator is selected so that an induced voltage in the machine has a waveform which approximates a sinusoidal waveform; and an angle θ whose sides are radii of the rotor passing through opposite circumferential ends of a surface of each permanent magnet facing the stator satisfies the expression: θ≈(n+0.5)×τ.sub.s where n is a natural number and τ s is the pitch of slots in the stator.

Claim 7

Dependent Claim 160 words

A permanent magnet electric machine comprising: a stator provided with windings thereon; and a rotor disposed with an air gap between the stator and the rotor, and having a plurality of permanent magnets embedded along a circumference thereof, with spacing between adjacent magnets; wherein a circumferential extent of surfaces of the permanent magnets facing the stator is selected so that an induced voltage in the machine has a waveform which approximates a sinusoidal waveform; the stator has forty-eight slots; the permanent magnets form eight poles; an angle whose sides are radii of the rotor passing through opposite circumferential ends of a surface of each permanent magnet which is nearer to the stator, is in the range of 26±1° measured in mechanical degrees; and an angle whose sides are radii of the rotor passing through opposite circumferential ends of a surface of each permanent magnet which is farther from the stator is in the range of 36+/-1° measured in mechanical degrees.

Claim 8

Dependent Claim 160 words

A permanent magnet electric machine comprising: a stator provided with windings thereon; and a rotor disposed with an air gap between the stator and the rotor, and having a plurality of permanent magnets embedded along a circumference thereof, with spacing between adjacent magnets; wherein a circumferential extent of surfaces of the permanent magnets facing the stator is selected so that an induced voltage in the machine has a waveform which approximates a sinusoidal waveform; the stator has forty-eight slots; the permanent magnets form eight poles; an angle whose sides are radii of the rotor passing through opposite circumferential ends of a surface of each permanent magnet which is nearer to the stator, is in the range of 26±1° measured in mechanical degrees; and an angle whose sides are radii of the rotor passing through opposite circumferential ends of a surface of each permanent magnet which is farther from the stator is in the range of 36+/-1° measured in mechanical degrees.

Claim 9

Dependent Claim 121 words

A permanent magnet electric motor comprising: a stator having an electrical winding arranged in slots thereof; and a rotor which is rotatable within said stator and has a plurality of permanent magnets partially embedded in a core thereof and projecting at least to an outer circumference of said core, adjacent an inner circumference of said stator, whereby magnetic flux of said permanent magnets links said windings of said stator; wherein an angle θ which defines a circumferential angular extent of a portion of each of said permanent magnets which projects at least to said outer circumference of said core satisfies the expression: θ≈(n+0.5)×τ.sub.s where n is an integer and τ s is a slot pitch of the slots in said stator.

Claim 10

Dependent Claim 121 words

A permanent magnet electric motor comprising: a stator having an electrical winding arranged in slots thereof; and a rotor which is rotatable within said stator and has a plurality of permanent magnets partially embedded in a core thereof and projecting at least to an outer circumference of said core, adjacent an inner circumference of said stator, whereby magnetic flux of said permanent magnets links said windings of said stator; wherein an angle θ which defines a circumferential angular extent of a portion of each of said permanent magnets which projects at least to said outer circumference of said core satisfies the expression: θ≈(n+0.5)×τ.sub.s where n is an integer and τ s is a slot pitch of the slots in said stator.

Claim 11

Dependent Claim 100 words

A permanent magnet electric motor comprising: a stator having electrical windings arranged in slots thereof; and a rotor which is rotatable within said stator and has a plurality of permanent magnets embedded on an outer circumference thereof adjacent an inner circumference of said stator, whereby magnetic flux of said permanent magnets links said windings on said stator; wherein an angle θ which defines a circumferential angular extent of a radially outer surface of each of said permanent magnets satisfies the expression: θ≈(n+0.5)×τ.sub.s where n is an integer and τ s is a slot pitch of the slots in said stator.

Claim 12

Dependent Claim 100 words

A permanent magnet electric motor comprising: a stator having electrical windings arranged in slots thereof; and a rotor which is rotatable within said stator and has a plurality of permanent magnets embedded on an outer circumference thereof adjacent an inner circumference of said stator, whereby magnetic flux of said permanent magnets links said windings on said stator; wherein an angle θ which defines a circumferential angular extent of a radially outer surface of each of said permanent magnets satisfies the expression: θ≈(n+0.5)×τ.sub.s where n is an integer and τ s is a slot pitch of the slots in said stator.

Claim 13

Dependent Claim 65 words

A permanent magnet electric machine according to claim 6, wherein: the stator has forty-eight slots; the permanent magnets form eight poles; the angle θ is within a range of 26±1° measured in mechanical degrees; and an angle .o slashed. which defines a circumferential angular extent of a radially inward surface of each of said permanent magnets is within a range of 36±1° measured in mechanical.

Claim 14

Dependent Claim 37 words

A permanent magnet electric machine according to claim 6, wherein: the angle θ is smaller than an angle .o slashed. which defines a circumferential angular extent of a radially inward surface of each of said permanent magnets.

Claim 15

Dependent Claim 18 words

A permanent magnet electric machine according to claim 8, wherein the permanent magnets have a trapezoidal cross section.

Claim 16

Dependent Claim 24 words

The permanent magnet electric motor according to claim 6, wherein magnetic gaps are formed in said rotor at opposite ends of each permanent magnet.

Claim 17

Dependent Claim 34 words

The permanent magnet electric machine according to claim 10 wherein said magnetic gaps comprise one of empty hollow spaces within said rotor, and spaces in said rotor, which are filled with a nonmagnetic substance.

Claim 18

Dependent Claim 120 words

A permanent magnet electric machine comprising: a stator provided with windings thereon; and a rotor disposed with an air gap between the stator and the rotor, and having a plurality of permanent magnets fixed along a circumference thereof; wherein an angle θ which defines an angular extent of an outer surface of each of said permanent magnets satisfies one of the expressions: θ≈n×τ.sub.s +α; θ≈n×τ.sub.s +β; or θ≈n×τ.sub.s +γ where n is a natural number, τ s is the pitch of slots in a slot stator, α is an angle formed by a tooth of the stator, β is an angle formed by a slot of the stator, and γ is an angle formed by an opening of each slot.

Claim 19

Dependent Claim 120 words

A permanent magnet electric machine comprising: a stator provided with windings thereon; and a rotor disposed with an air gap between the stator and the rotor, and having a plurality of permanent magnets fixed along a circumference thereof; wherein an angle θ which defines an angular extent of an outer surface of each of said permanent magnets satisfies one of the expressions: θ≈n×τ.sub.s +α; θ≈n×τ.sub.s +β; or θ≈n×τ.sub.s +γ where n is a natural number, τ s is the pitch of slots in a slot stator, α is an angle formed by a tooth of the stator, β is an angle formed by a slot of the stator, and γ is an angle formed by an opening of each slot.

Claim 20

Dependent Claim 24 words

The permanent magnet electric motor according to claim 12, wherein magnetic gaps are formed in said rotor at opposite ends of each permanent magnet.

Claim 21

Dependent Claim 34 words

The permanent magnet electric machine according to claim 13 wherein said magnetic gaps comprise one of empty hollow spaces within said rotor, and spaces in said rotor, which are filled with a nonmagnetic substance.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	2003-10-17	2004-04-17	2004-10-17	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	2007-10-17	2008-04-17	2008-10-17	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	2011-10-17	2012-04-17	2012-10-17	$7700.00	Window Closed / Lapsed

Permanent magnet dynamoelectric rotating machine and electric vehicle equipped with the same

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