US4336475A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Slotless brushless motor
Assignee: Hitachi Ltd
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Filing: 1979-08-14
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Granted: 1982-06-22
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Expires: 1999-08-14
Abstract
Abstract The present invention relates to a slotless, brushless motor comprising a permanent magnet rotor rotationary together with a shaft and a stationary armature coil disposed in opposition to the rotor. The armature coil comprises a coil portion concentrically wound, an adjacent coil portion formed in sequence from the coil portion and concentrically wound, a coil performed on a plane by a plurality of the coil portions, N coils (N is integer) laid on each other and different in a phase respectively, sheets disposed between said N coils and a supporting member supporting the coils and the sheets made integral.
Inventors
- 👤 Shigeki Morinaga
- 👤 Kunio Miyashita
- 👤 Tadashi Takahashi
- 👤 Takeo Maeda
- 👤 Seizi Yamashita
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:55
CPC Classifications
H; H02; H02K; H02K21/00; H02K21/12; H02K21/24; H02K3/00
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
120 words
A slotless and brushless motor provided with a shaft mounted for rotation, a permanent magnet rotor integrally rotating with the shaft, a stator of armature including coils each of which consists of a plurality of concentrically wound coil portions formed in sequence and disposed opposite the permanent magnet rotor, and a supporting member for supporting the stator, wherein the stator comprises three coils each phase of which differs by 120°, the coils are disposed adjacent each other in spaced parallel planes, each coil consists of eight coil portions and is provided with two terminals; a prepreg or adhesive sheet is respectively disposed between said three coils; and, each of the coil portions is made from a self-melting and adhering conductor.
Claim 2
Dependent Claim
120 words
A slotless and brushless motor provided with a shaft mounted for rotation, a permanent magnet rotor integrally rotating with the shaft, a stator of armature including coils each of which consists of a plurality of concentrically wound coil portions formed in sequence and disposed opposite the permanent magnet rotor, and a supporting member for supporting the stator, wherein the stator comprises three coils each phase of which differs by 120°, the coils are disposed adjacent each other in spaced parallel planes, each coil consists of eight coil portions and is provided with two terminals; a prepreg or adhesive sheet is respectively disposed between said three coils; and, each of the coil portions is made from a self-melting and adhering conductor.
Claim 3
Dependent Claim
15 words
A slotless, brushless motor of claim 1, wherein three coils are laid on each other.
Claim 4
Dependent Claim
17 words
A slotless, brushless motor of claim 1, wherein the coil comprises eight coil portions and eight poles.
Claim 5
Dependent Claim
21 words
A slotless, brushless motor of claim 1, wherein the coils are made integral by means of a heat-adherence treatment under pressure.
Claim 6
Dependent Claim
107 words
A slotless and brushless motor provided with a shaft mounted for rotation, a permanent magnet rotor integrally rotating with the shaft, a stator of armature including coils each of which consists of a plurality of concentrically wound coil portions formed in sequence and disposed opposite the permanent magnet rotor, and a supporting member for supporting the stator, wherein the stator comprises groups of coils different in a phase respectively, the groups are disposed adjacent each other in spaced parallel planes, a prepreg or adhesive sheet is respectively disposed between said groups of coils, and each of the coil portions is made from a self-melting and adhering conductor.
Claim 7
Dependent Claim
107 words
A slotless and brushless motor provided with a shaft mounted for rotation, a permanent magnet rotor integrally rotating with the shaft, a stator of armature including coils each of which consists of a plurality of concentrically wound coil portions formed in sequence and disposed opposite the permanent magnet rotor, and a supporting member for supporting the stator, wherein the stator comprises groups of coils different in a phase respectively, the groups are disposed adjacent each other in spaced parallel planes, a prepreg or adhesive sheet is respectively disposed between said groups of coils, and each of the coil portions is made from a self-melting and adhering conductor.
Claim 8
Dependent Claim
33 words
A slotless, brushless motor of claim 5, wherein each coil portion comprises a circular arc outer portion, two side portions in an acute angle and an inner portion arranged between the side portions.
Claim 9
Dependent Claim
23 words
A slotless, brushless motor of claim 5, wherein said supporting means is a yoke iron plate forming one part of a magnetic circuit.
Claim 10
Dependent Claim
33 words
A slotless, brushless motor of claim 7, wherein the yoke iron plate comprises a circular disk and a supporting portion on which a terminal plate for connecting terminals from each coil is mounted.
Claim 11
Dependent Claim
24 words
A slotless, brushless motor of claim 5, wherein the coils and the sheets are made integral by means of a heat-adherence treatment under pressure.
Claim 12
Dependent Claim
23 words
A slotless, brushless motor of claim 5, wherein the permanent magnet rotor comprises a single flat magnet is the shape of a disc.
Claim 13
Dependent Claim
68 words
A slotless brushless motor comprising a shaft mounted for rotation, a permanent magnet rotor fixed to the shaft, an integral stator of armature, and means for supporting the integral stator; wherein the integral stator comprises coils for forming separate phases having concentrically and sequentially wound coil portions arranged in a plane, and adhesive sheets means for fixing the coils parallel to one another, thereby providing the integral stator.
Claim 14
Dependent Claim
68 words
A slotless brushless motor comprising a shaft mounted for rotation, a permanent magnet rotor fixed to the shaft, an integral stator of armature, and means for supporting the integral stator; wherein the integral stator comprises coils for forming separate phases having concentrically and sequentially wound coil portions arranged in a plane, and adhesive sheets means for fixing the coils parallel to one another, thereby providing the integral stator.
Claim 15
Dependent Claim
28 words
A slotless and brushless motor as set forth in claim 11, wherein the coils comprise a self-melting and adhering conductor for fixing the coils parallel to one another.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-06-21 | 1985-12-21 | 1986-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-06-21 | 1989-12-21 | 1990-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-06-21 | 1993-12-21 | 1994-06-22 | $7700.00 | Window Closed / Lapsed |