Patent US3719845A successfully refreshed from Google Patents.
US3719845A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Disc rotor
Assignee: Panasonic Holdings Corp
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Filing: 1972-01-26
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Granted: 1973-03-06
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Expires: 1992-01-26
Abstract
Abstract A plurality of armature elements having the same coil pattern are stacked one upon another, mounted on a shaft with each element angularly displaced from the adjacent one by an angle equal to that subtended by one segment of the commutator with respect to the center of the shaft and connected with one another to form a wave winding so that a disc rotor consisting of a plurality of similar armature elements may be provided, each of the armature elements comprising a disc-like thin insulator film and spiral conductor coils formed through printed circuit technique on both sides of the insulator film disc, the number of the spiral coils on one side of the disc being the same as that on the other side of the disc, the number being also the same as that of magnetic poles of the stator, and the coil pitch of one of the spiral coils disposed on each side of the disc being different from those of the other coils on the side of the disc so as to provide a geometrically asymmetrical coil pattern.
Inventors
- 👤 N Takeda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 19:53
CPC Classifications
H; H02; H02K; H02K3/00; H02K3/04; H02K3/26
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
240 words
A disc rotor having a wave winding comprising a shaft, a commutator consisting of a plurality of segments and a plurality of armature elements having the same coil patterns formed through printed circuit technique each of which constitutes one round of the wave winding, wherein said armature elements are stacked one upon another with an insulator film interposed between two adjacent elements and mounted on said shaft with each element displaced circumferentially from the adjacent one by an angle equal to that subtended by one segment of said commutator with respect to the center of said shaft, wherein the coil pattern on each side of any one of said armature elements consisTs of a plurality of component spiral coils whose number p is equal to that of magnetic poles on the stator, and wherein the coil pitches of p-1 coils of the p coils on each side of said one armature element are all the same while the remaining one of said p coils has a different coil pitch than the other so as to provide a geometrically asymmetrical winding pattern; the coil pitch for said p-1 coils being (2(S-1))/p . pi /S for non-crossed wave windings, or (2(S+1)/p . pi /S for crossed wave windings, and the coil pitch for the remaining coil being ((2(S-1))/p + 2) pi /S for non-crossed wave windings, or ((2(S+1))/p -2) pi /S for crossed wave windings, where S is number of commutator segments.
Claim 2
Dependent Claim
240 words
A disc rotor having a wave winding comprising a shaft, a commutator consisting of a plurality of segments and a plurality of armature elements having the same coil patterns formed through printed circuit technique each of which constitutes one round of the wave winding, wherein said armature elements are stacked one upon another with an insulator film interposed between two adjacent elements and mounted on said shaft with each element displaced circumferentially from the adjacent one by an angle equal to that subtended by one segment of said commutator with respect to the center of said shaft, wherein the coil pattern on each side of any one of said armature elements consisTs of a plurality of component spiral coils whose number p is equal to that of magnetic poles on the stator, and wherein the coil pitches of p-1 coils of the p coils on each side of said one armature element are all the same while the remaining one of said p coils has a different coil pitch than the other so as to provide a geometrically asymmetrical winding pattern; the coil pitch for said p-1 coils being (2(S-1))/p . pi /S for non-crossed wave windings, or (2(S+1)/p . pi /S for crossed wave windings, and the coil pitch for the remaining coil being ((2(S-1))/p + 2) pi /S for non-crossed wave windings, or ((2(S+1))/p -2) pi /S for crossed wave windings, where S is number of commutator segments.
Claim 3
Dependent Claim
240 words
A disc rotor having a wave winding comprising a shaft, a commutator consisting of a plurality of segments and a plurality of armature elements having the same coil patterns formed through printed circuit technique each of which constitutes one round of the wave winding, wherein said armature elements are stacked one upon another with an insulator film interposed between two adjacent elements and mounted on said shaft with each element displaced circumferentially from the adjacent one by an angle equal to that subtended by one segment of said commutator with respect to the center of said shaft, wherein the coil pattern on each side of any one of said armature elements consisTs of a plurality of component spiral coils whose number p is equal to that of magnetic poles on the stator, and wherein the coil pitches of p-1 coils of the p coils on each side of said one armature element are all the same while the remaining one of said p coils has a different coil pitch than the other so as to provide a geometrically asymmetrical winding pattern; the coil pitch for said p-1 coils being (2(S-1))/p . pi /S for noncrossed wave windings, or (2(S+1)/p . pi /S for crossed wave windings, and the coil pitch for the remaining coil being ((2(S1))/p + 2) pi /S for non-crossed wave windings, or ((2(S+1))/p 2) pi /S for crossed wave windings, where S is number of commutator segments.
Claim 4
Dependent Claim
240 words
A disc rotor having a wave winding comprising a shaft, a commutator consisting of a plurality of segments and a plurality of armature elements having the same coil patterns formed through printed circuit technique each of which constitutes one round of the wave winding, wherein said armature elements are stacked one upon another with an insulator film interposed between two adjacent elements and mounted on said shaft with each element displaced circumferentially from the adjacent one by an angle equal to that subtended by one segment of said commutator with respect to the center of said shaft, wherein the coil pattern on each side of any one of said armature elements consisTs of a plurality of component spiral coils whose number p is equal to that of magnetic poles on the stator, and wherein the coil pitches of p-1 coils of the p coils on each side of said one armature element are all the same while the remaining one of said p coils has a different coil pitch than the other so as to provide a geometrically asymmetrical winding pattern; the coil pitch for said p-1 coils being (2(S-1))/p . pi /S for noncrossed wave windings, or (2(S+1)/p . pi /S for crossed wave windings, and the coil pitch for the remaining coil being ((2(S1))/p + 2) pi /S for non-crossed wave windings, or ((2(S+1))/p 2) pi /S for crossed wave windings, where S is number of commutator segments.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-03-05 | 1976-09-04 | 1977-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-05 | 1980-09-04 | 1981-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-05 | 1984-09-04 | 1985-03-06 | $7700.00 | Window Closed / Lapsed |