Rotary inductor

Claim 2

A polyphase rotary inductor vector adder having n phases where n is an integer greater than two comprising, in combination, a ferromagnetic stator having n angularly displaced first teeth and n angularly displaced second teeth, said first teeth being angularly displaced from said second teeth, a first energizing winding having serially connected turns surrounding each of said first teeth, a second energizing winding having serially connected turns surrounding each of said second teeth, and n phase output windings each of which has turns surrounding one of said first teeth connected in series with turns surrounding one of said second teeth which one first and one second tooth are displaced by multiples of 360/n electrical degrees from the first and second teeth surrounded by the turns of the other phase output windings, and ferromagnetic rotor means disposed adjacent said stator in spaced confronting relation with said teeth and being separated therefrom by a magnetic reluctance gap and being rotatable within said stator for modulating the permeances of the magnetic flux paths which extend through said teeth and across the gap into said rotor means.

Claim 3

A vector adder in accordance with claim 1 wherein said stator has 2n first teeth and 2n second teeth and said first energizing winding has serially connected turns surrounding eacH of said first teeth so that the magnetic fluxes flow in opposite directions in successive first teeth and said second energizing winding has serially connected turns surrounding each of said second teeth so that the magnetic fluxes flow in opposite directions in successive second teeth and each said phase output winding has turns surrounding each of a pair of said first teeth connected in subtractive relation and turns surrounding each of a pair of said second teeth connected in subtractive relation and also connected in series with said turns surrounding said pair of first teeth.

Claim 4

A rotary inductor in accordance with claim 1 wherein said first teeth are displaced 360/n electrical degrees apart and said second teeth are displaced 360/n electrical degrees apart and also displaced 90 electrical degrees from said first teeth.

Claim 5

A polyphase rotary inductor, vector adder having n phases where n is an integer greater than two comprising, in combination, a ferromagnetic stator having at least 4n radially extending, angularly displaced teeth 2n of which are first teeth and 2n of which are second teeth, a first energizing winding having turns surrounding each of said first teeth connected in series, a second energizing winding having turns surrounding each of said second teeth connected in series, n secondary phase output windings each of which has turns surrounding each of one pair of said first teeth connected in subtractive relation and turns surrounding each of one pair of said second teeth connected in subtractive relation and also connected in series with said turns surrounding said first teeth, said one pair of first and one pair of second teeth surrounded by turns of each output phase windings being displaced by multiples of 360/n electrical degrees from the corresponding pairs of first and second teeth surrounded by the turns of the other phase output windings, and ferromagnetic rotor means rotatable relative to said stator and disposed adjacent said stator in spaced confronting relation with said teeth and separated therefrom by a magnetic reluctance gap for cyclically modulating the permeances of the magnetic flux paths which extend through said teeth and across said gap into said rotor means as it rotates.

Claim 6

A polyphase rotary inductor, vector adder having n phases where n is an integer greater than two comprising, in combination, a ferromagnetic stator having at least 4n radially extending, angularly displaced teeth 2n of which are first teeth and 2n of which are second teeth, a first energizing winding having turns surrounding each of said first teeth connected in series, a second energizing winding having turns surrounding each of said second teeth connected in series, n secondary phase output windings each of which has turns surrounding each of one pair of said first teeth connected in subtractive relation and turns surrounding each of one pair of said second teeth connected in subtractive relation and also connected in series with said turns surrounding said first teeth, said one pair of first and one pair of second teeth surrounded by turns of each output phase windings being displaced by multiples of 360/n electrical degrees from the corresponding pairs of first and second teeth surrounded by the turns of the other phase output windings, and ferromagnetic rotor means rotatable relative to said stator and disposed adjacent said stator in spaced confronting relation with said teeth and separated therefrom by a magnetic reluctance gap for cyclically modulating the permeances of the magnetic flux paths which extend through said teeth and across said gap into said rotor means as it rotates.

Claim 7

A rotary inductor vector adder in accordance with claim 4 wherein n is three and said teeth are all in a common plane and displaced 30 electrical degrees apart, said first teeth are odd-numbered teeth, and said second teeth are even-numbered teeth and disposed between said first teeth.

Claim 8

A polyphase rotary inductor vector adder in accordance with claim 4 wherein said one pair of first teeth are angularly displaced 90 electrical degrees from said one pair of second teeth and said pair of first teeth are angularly displaced 180 electrical degrees apart and said pair of second teeth are angularly displaced 180 electrical degrees apart.

Claim 9

A rotary inductor vector adder in accordance with claim 4 wherein said first teeth are all on the same portion of said stator and said second teeth are all on a different portion of said stator.

Claim 10

A rotary inductor vector adder in accordance with claim 4 wherein the turns of said first energizing winding are wound to generate magnetic fluxes in opposite directions in successive first teeth and the sum of the instantaneous magnetic fluxes in all of said first teeth is zero and the turns of said second energizing winding are wound to generate magnetic fluxes in opposite directions in successive second teeth and the sum of the instantaneous magnetic fluxes in all of said second teeth is zero, and wherein the permeances of said magnetic flux paths which extend through said teeth and across the gap into said rotor means vary substantially sinusoidally.

Claim 11

A polyphase rotary inductor vector adder in accordance with claim 4 wherein said ferromagnetic stator is annular and said teeth project radially inward and said ferromagnetic rotor means includes a rotor rotatable within said stator having a lobe with the smallest gap to said teeth and wherein the permeances of the magnetic flux paths through said teeth and across the gap into said rotor vary substantially sinusoidally.

Claim 12

A rotary inductor vector adder in accordance with claim 4 wherein said stator includes first and second axially spaced annular ferromagnetic stator members, said first teeth are on said first stator member and said second teeth are on said second stator member and are angularly displaced 90 electrical degrees from said first teeth, and said ferromagnetic rotor means includes first and second rotors rotatable within said first and second stators respectively and each of which has a lobe with the smallest gap to said stator teeth and wherein the permeances of the magnetic flux paths through said teeth on each of said first and second stator members and across the gap into the corresponding rotor vary substantially sinusoidally.

Claim 13

A polyphase rotary inductor vector adder for controlling an electric motor having n phases and p poles where n is an integer greater than 2 and p is an even-numbered integer greater than two comprising, in combination, an annular ferromagnetic stator having at least 4n angularly displaced, radially projecting teeth around its periphery, at least 2n of said teeth constituting first teeth and at least 2n of said teeth constituting second teeth and being angularly displaced from said first teeth, a first energizing winding having turns surrounding each of said first teeth connected in series so that the magnetic fluxes are in opposite directions in successive first teeth and the sum of the instantaneous magnetic fluxes therein is zero, a second energizing winding having turns surrounding each of said second teeth connected in series so that the magnetic fluxes are in opposite directions in successive second teeth and the sum of the instantaneous magnetic fluxes therein is zero, n phase output windings each of which has turns surrounding each of one pair of said first teeth connected in subtractive relation and turns surrounding each of one pair of said second teeth connected in subtractive relation and also connected in series with said turns surrounding said first teeth, said one pair of first and one pair of second teeth being displaced by multiples of 360/n electrical degrees from the corresponding pairs of first and second teeth surrounded by turns of the other phase output windings, and ferromagnetic rotor means disposed adjacent said stator in confronting relation to said teeth and being spaced therefrom by a magnetic reluctance gap and being rotatable relative to said stator for cyclically modulating the permeances of the magnetic flux paths extending through said teeth and across said gap into said rotor means as it rotates, said rotor means having p/2 angularly displaced portions at which the permeance of the flux path through a tooth is a minimum when said portion is opposite thereto.

Claim 14

A polyphase rotary inductor vector adder for controlling an electric motor having n phases and p poles where n is an integer greater than 2 and p is an even-numbered integer greater than two comprising, in combination, an annular ferromagnetic stator having at least 4n angularly displaced, radially projecting teeth around its periphery, at least 2n of said teeth constituting first teeth and at least 2n of said teeth constituting second teeth and being angularly displaced from said first teeth, a first energizing winding having turns surrounding each of said first teeth connected in series so that the magnetic fluxes are in opposite directions in successive first teeth and the sum of the instantaneous magnetic fluxes therein is zero, a second energizing winding having turns surrounding each of said second teeth connected in series so that the magnetic fluxes are in opposite directions in successive second teeth and the sum of the instantaneous magnetic fluxes therein is zero, n phase output windings each of which has turns surrounding each of one pair of said first teeth connected in subtractive relation and turns surrounding each of one pair of said second teeth connected in subtractive relation and also connected in series with said turns surrounding said first teeth, said one pair of first and one pair of second teeth being displaced by multiples of 360/n electrical degrees from the corresponding pairs of first and second teeth surrounded by turns of the other phase output windings, and ferromagnetic rotor means disposed adjacent said stator in confronting relation to said teeth and being spaced therefrom by a magnetic reluctance gap and being rotatable relative to said stator for cyclically modulating the permeances of the magnetic flux paths extending through said teeth and across said gap into said rotor means as it rotates, said rotor means having p/2 angularly displaced portions at which the permeance of the flux path through a tooth is a minimum when said portion is opposite thereto.

Claim 15

A rotary inductor vector adder in accordance with claim 11 wherein p is an even-numbered integer greater than 4 and said teeth extend radially inward, said rotor means includes a ferromagnetic rotor having p/2 angularly displaced lobes with the smallest gap to said teeth and valleys between said lobes, the permeances of the magnetic flux paths through said teeth and across the gap into said rotor varying substantially sinusoidally.

Claim 16

A rotary inductor vector adder in accordance with claim 12 wherein said one pair of first teeth is displaced 90 electrical degrees from said one pair of second teeth and said one pair of first teeth are displaced 180 electrical degrees apart and said one pair of second teeth are displaced 180 electrical degrees apart.

Claim 17

A rotary indUctor vector adder in accordance with claim 11 having p/2 pole-pairs each of which includes 2n first teeth and 2n second teeth and each said phase output winding has, in each pole-pair, turns surrounding each of one pair of said first teeth of said pole-pair connected in subtractive relation and turns surrounding each of one pair of said second teeth of said pole-pair connected in subtractive relation and connected in series with said turns surrounding said one pair of first teeth with all of said turns of said p/2 pole-pairs being connected in series to form said phase output winding.

Claim 18

A rotary inductor vector adder in accordance with claim 14 wherein said teeth extend radially inward, said rotor means includes a ferromagnetic rotor having p/2 angularly displaced lobes with the smallest gap to said teeth and valleys between said lobes, the permeances of the magnetic flux paths through said teeth and across the gap into said rotor varying substantially sinusoidally, said first teeth and said second teeth are disposed alternately, and said one pair of first teeth is angularly displaced 90 electrical degrees from said one pair of second teeth.

Claim 19

A rotary inductor vector adder in accordance with claim 11 wherein said 2n first teeth are successive teeth and said 2n second teeth are successive teeth and are disposed on said stator approximately diametrically opposite said first teeth to minimize the interaction of the magnetic fluxes flowing in said first teeth with the magnetic fluxes flowing in said second teeth.

Claim 20

A rotary inductor vector adder in accordance with claim 11 wherein the periphery of said stator defines p/2 times 360 electrical degrees and said 2n first teeth are successive and extend around 360 electrical degrees of said stator and the centerline between said one pair of first teeth is effectively displaced by 90 electrical degrees from the centerline between said one pair of second teeth.

Claim 21

A polyphase rotary inductor vector adder for controlling an electric motor having n phases and p poles where n is an integer greater than two and p is an even-numbered integer greater than four comprising, in combination, an annular ferromagnetic stator having at least n times p angularly displaced, radially projecting teeth around its periphery, one half of said teeth constituting first teeth and one half of said teeth constituting second teeth, said stator defining p/2 times 360 electrical degrees and p/2 pole-pairs and each pole-pair constituting n first teeth angularly displaced 360/n electrical degrees apart and n second teeth angularly displaced 360/n electrical degrees apart and said second teeth being angularly displaced from said first teeth of said pole-pair, a first energizing winding having turns surrounding each of said first teeth connected in series, a second energizing winding having turns surrounding each of said second teeth connected in series, n phase output windings each of which has serially connected turns surrounding one first tooth in each pole-pair connected in series with turns surrounding one second tooth in said pole-pair, and ferromagnetic rotor means disposed adjacent said rotor in confronting relation to said teeth and being spaced therefrom by a magnetic reluctance gap and being rotatable relative to said stator for cyclically modulating the permeances of the magnetic flux paths extending through said teeth and across said gap into said rotor means as it rotates and also having p/2 angularly displaced portions at which the permeance of a flux path through a tooth is a minimum when said portion is opposite thereto.

Claim 22

A polyphase rotary inductor vector adder for controlling an electric motor having n phases and p poles where n is an integer greater than two and p is an even-numbered integer greater than four comprising, in combination, an annular ferromagnetic stator having at least n times p angularly displaced, radially projecting teeth around its periphery, one half of said teeth constituting first teeth and one half of said teeth constituting second teeth, said stator defining p/2 times 360 electrical degrees and p/2 pole-pairs and each pole-pair constituting n first teeth angularly displaced 360/n electrical degrees apart and n second teeth angularly displaced 360/n electrical degrees apart and said second teeth being angularly displaced from said first teeth of said pole-pair, a first energizing winding having turns surrounding each of said first teeth connected in series, a second energizing winding having turns surrounding each of said second teeth connected in series, n phase output windings each of which has serially connected turns surrounding one first tooth in each pole-pair connected in series with turns surrounding one second tooth in said pole-pair, and ferromagnetic rotor means disposed adjacent said rotor in confronting relation to said teeth and being spaced therefrom by a magnetic reluctance gap and being rotatable relative to said stator for cyclically modulating the permeances of the magnetic flux paths extending through said teeth and across said gap into said rotor means as it rotates and also having p/2 angularly displaced portions at which the permeance of a flux path through a tooth is a minimum when said portion is opposite thereto.

Claim 23

A rotary inductor vector adder in accordance with claim 18 wherein said teeth extend radially inward and said rotor means includes a ferromagnetic rotor haviNg p/2 angularly displaced lobes with the smallest gap to said teeth and valleys between said lobes and the permeances of said magnetic flux paths through said teeth and across the gap into said rotor vary substantially sinusoidally.

Claim 24

A vector adder in accordance with claim 18 where p/2 is an odd number and said stator has at least 2n times p teeth and each pole-pair constitutes 2n first teeth and 2n second teeth and the turns of said first energizing winding individually surround said first teeth in each pole-pair so that the magnetic fluxes flow in opposite directions in successive first teeth and the turns of said second energizing winding individually surround said second teeth in each pole-pair so that the magnetic fluxes flow in opposite directions in successive second teeth.

Claim 25

A rotary inductor vector adder comprising, in combination, an annular ferromagnetic stator having a pair of radially inward projecting first teeth which are angularly displaced 180 electrical degrees from each other and a pair of radially inward projecting second teeth which are angularly displaced 180 electrical degrees from each other and also angularly displaced 90 electrical degrees from said first teeth, a first energizing winding having serially connected turns surrounding each of said pair of first teeth to induce magnetic fluxes in said first teeth when current is passed through said first energizing winding, a second energizing winding having serially connected turns surrounding each of said pair of second teeth to induce magnetic fluxes in said second teeth when current is passed through said second energizing winding, an output winding having turns surrounding each of said pair of first teeth connected in subtractive relation and turns surrounding each of said pair of second teeth connected in subtractive relation and also connected in series with said turns surrounding said first teeth to vectorially add the voltages induced in said turns surrounding said first teeth and said turns surrounding said second teeth, and ferromagnetic rotor means rotatable within said stator and separated from said teeth by a magnetic reluctance gap for cyclically modulating the permeances of the magnetic flux paths extending through said teeth and across said gap into said rotor as it rotates within said stator to cyclically modulate the output signal from said output winding.

Claim 26

A rotary inductor vector adder comprising, in combination, an annular ferromagnetic stator having a pair of radially inward projecting first teeth which are angularly displaced 180 electrical degrees from each other and a pair of radially inward projecting second teeth which are angularly displaced 180 electrical degrees from each other and also angularly displaced 90 electrical degrees from said first teeth, a first energizing winding having serially connected turns surrounding each of said pair of first teeth to induce magnetic fluxes in said first teeth when current is passed through said first energizing winding, a second energizing winding having serially connected turns surrounding each of said pair of second teeth to induce magnetic fluxes in said second teeth when current is passed through said second energizing winding, an output winding having turns surrounding each of said pair of first teeth connected in subtractive relation and turns surrounding each of said pair of second teeth connected in subtractive relation and also connected in series with said turns surrounding said first teeth to vectorially add the voltages induced in said turns surrounding said first teeth and said turns surrounding said second teeth, and ferromagnetic rotor means rotatable within said stator and separated from said teeth by a magnetic reluctance gap for cyclically modulating the permeances of the magnetic flux paths extending through said teeth and across said gap into said rotor as it rotates within said stator to cyclically modulate the output signal from said output winding.

Claim 27

A rotary inductor vector adder in accordance with claim 1 wherein said stator has 2n first and 2n second teeth, said first energizing winding has serially connected turns surrounding each of said first teeth, said second energizing winding has serially connected turns surrounding each of said second teeth, and each phase output winding has turns surrounding each of a pair of said first teeth angularly displaced 180 electrical degrees connected in subtractive relation and turns surrounding each of a pair of said second teeth angularly displaced 180 electrical degrees connected in subtractive relation and wherein said first teeth are angularly displaced 90 electrical degrees from said second teeth.