US4704566A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self-starting disk-type brushless motor with screw projection for generating cogging
Assignee: Shicoh Engineering Co Ltd
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Filing: 1986-06-19
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Granted: 1987-11-03
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Expires: 2006-06-19
Abstract
Abstract A disk-type brushless motor comprises a 2p-pole magnet rotor (p represents an integer of 2 or more) having alternating N and S poles and a single position sensor element. A stator armature having an armature coil is formed on two conductors which contribute to the generation of torques and extend with an opening angle substantially equal to the width of each magnetic pole of the magnet rotor. A projection such as a screw for generating cogging to enable the self-start of the magnet rotor is disposed at a place somewhere short substantially by a width Pw4+n·Pw wherein Pw is a width per pole of the magnet rotor, and n is a positive integer of 1 or more, from the conductor which contributes to the generation of torques toward the rotational direction of the magnet rotor.
Inventors
- 👤 Norimitsu Hirano
- 👤 Masataka Ogawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 10:58
CPC Classifications
H; H02; H02K; H02K29/00; H02K29/06; H02K29/08
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
180 words
A disk-type brushless motor comprising: a 2p-pole magnet rotor (where p represents an integer of 2 or more) having alternating N and S poles; a stator armature having an armature coil formed on two conductors which contribute to the generation of torques and extend with an opening angle substantially equal to the width of each magnetic pole of the magnet rotor; a single position sensor element; and means for generating cogging to enable the self-start of the magnet rotor, said means for generating cgging being disposed at a place somewhere short substantially by a width Pw/4+n·Pw wherein Pw is a width per pole of the magnet rotor, and n is a positive integer of 1 or more, from the conductor which contributes to the generation of torques toward the rotational direction of the magnet rotor; said means for generating cogging including at least one projection made of a magnetic material being disposed at said place therein, said at least one projection being coupled to said stator armature and a fixing member, for attaching said stator armature to said fixing member.
Claim 2
Dependent Claim
180 words
A disk-type brushless motor comprising: a 2p-pole magnet rotor (where p represents an integer of 2 or more) having alternating N and S poles; a stator armature having an armature coil formed on two conductors which contribute to the generation of torques and extend with an opening angle substantially equal to the width of each magnetic pole of the magnet rotor; a single position sensor element; and means for generating cogging to enable the self-start of the magnet rotor, said means for generating cgging being disposed at a place somewhere short substantially by a width Pw/4+n·Pw wherein Pw is a width per pole of the magnet rotor, and n is a positive integer of 1 or more, from the conductor which contributes to the generation of torques toward the rotational direction of the magnet rotor; said means for generating cogging including at least one projection made of a magnetic material being disposed at said place therein, said at least one projection being coupled to said stator armature and a fixing member, for attaching said stator armature to said fixing member.
Claim 3
Dependent Claim
24 words
The disk-type brushless motor of claim 1, wherein said at least one projection comprises a pair of said projections, each made of magnetic material.
Claim 4
Dependent Claim
19 words
The disk-type brushless motor of claim 2, wherein said pair of projections are substantially diametrically opposed on said rotor.
Claim 5
Dependent Claim
174 words
A disk-type brushless motor comprising: a 2p-pole magnet rotor (where p represents an integer of 2 or more) having alternating N and S poles; a stator armature having an armature coil formed on two conductors which contribute to the generation of torques and extend with an opening angle substantially equal to the width of each magnetic pole of the magnet rotor; a single position sensor element; and means for generating cogging to enable the self-start of the magnet rotor, said means for generating cogging being disposed at a place somewhere short substantially by a width Pw/4+n·Pw wherein Pw is a width per pole of the magnet rotor, and n is a positive integer of 1 or more, from the conductor which contributes to the generation of torques toward the rotational direction of the magnet rotor; said mean for generating cogging including at least one projection made of a magmnetic material being disposed at said place therein, said at least one projection comprising a screw-like member for attaching the stator armature on a fixing member.
Claim 6
Dependent Claim
174 words
A disk-type brushless motor comprising: a 2p-pole magnet rotor (where p represents an integer of 2 or more) having alternating N and S poles; a stator armature having an armature coil formed on two conductors which contribute to the generation of torques and extend with an opening angle substantially equal to the width of each magnetic pole of the magnet rotor; a single position sensor element; and means for generating cogging to enable the self-start of the magnet rotor, said means for generating cogging being disposed at a place somewhere short substantially by a width Pw/4+n·Pw wherein Pw is a width per pole of the magnet rotor, and n is a positive integer of 1 or more, from the conductor which contributes to the generation of torques toward the rotational direction of the magnet rotor; said mean for generating cogging including at least one projection made of a magmnetic material being disposed at said place therein, said at least one projection comprising a screw-like member for attaching the stator armature on a fixing member.
Claim 7
Dependent Claim
20 words
The disk-type brushless motor of claim 4, wherein said at least one projection comprises a pair of said screw-like members.
Claim 8
Dependent Claim
20 words
The disk-type brushless motor of claim 5, wherein said pair of screw-like members are substantially diametrically opposed on said rotor.
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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) | 1990-11-02 | 1991-05-04 | 1991-11-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-11-02 | 1995-05-04 | 1995-11-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-11-02 | 1999-05-04 | 1999-11-03 | $7700.00 | Window Closed / Lapsed |