US5440185A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composite magnet brushless DC motor
Assignee: Individual
•
Filing: 1992-10-09
•
Granted: 1995-08-08
•
Expires: 2012-10-09
Abstract
Abstract The brushless DC motor comprises at least one multi-pole composite magnet which functions as a rotor, at least one stator member which determines the angular position of this rotor, means for positioning the rotor(s) and the stator member(s) on a common axis, a sensing device for determining the position of the composite magnet relative to the stator member(s), and means for determining the magnetic configuration on the stator member. The composite magnet comprises two sections, each section having a plurality of projections and apertures. The projections and apertures on a first section mate with the apertures and projections, respectively, on the second section. The first and second sections are magnetized in opposite axial directions. In one embodiment, each stator member has a plurality of pole pieces which are positioned in operative relation to the composite magnet. Two windings are formed on each stator member. Applying current to one or the other of these windings determines the polarity of the pole pieces on that stator member. In another embodiment, the two windings are positioned into sectors by protrusions on the outer rim of the stator member.
Inventors
- 👤 Elmer C. Allwine, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 06:58
CPC Classifications
G; G01; G01B; G01B7/00; G01B7/30; H; H02; H02K; H02K1/00; H02K1/06; H02K1/12; H02K1/14; H02K1/146; H02K1/22; H02K1/27; H02K1/2793; H02K1/2795; H02K21/00; H02K21/12; H02K21/24; H02K29/00; H02K29/06; H02K29/08; H02K3/00; H02K3/04; H02K3/18; H02K3/46; H02K3/52; H02K3/521; H02K3/525; H02K2203/00; H02K2203/03
Claims Analysis
Total Claims: 32
Claim 1
Independent Claim
158 words
A brushless DC motor comprising: a multi-pole composite magnet having a first section and a second section, each section having a plurality of apertures extending completely through said section and a plurality of protrusions, wherein said apertures of said first section mate with said protrusions of said second section and said apertures of said second section mate with said protrusions of said first section, wherein said first section and said second section are magnetized in opposite axial directions; at least one stator member placed in operative relation to said multi-pole composite magnet; means for positioning said composite magnet and said at least one stator member on a common axis; a sensing device for determining a position of said composite magnet relative to said at least one stator member; and means for providing a magnetic configuration on said stator member, wherein said sensing device provides feedback signals to said means for providing said magnetic configuration on said stator member.
Claim 2
Dependent Claim
158 words
A brushless DC motor comprising: a multi-pole composite magnet having a first section and a second section, each section having a plurality of apertures extending completely through said section and a plurality of protrusions, wherein said apertures of said first section mate with said protrusions of said second section and said apertures of said second section mate with said protrusions of said first section, wherein said first section and said second section are magnetized in opposite axial directions; at least one stator member placed in operative relation to said multi-pole composite magnet; means for positioning said composite magnet and said at least one stator member on a common axis; a sensing device for determining a position of said composite magnet relative to said at least one stator member; and means for providing a magnetic configuration on said stator member, wherein said sensing device provides feedback signals to said means for providing said magnetic configuration on said stator member.
Claim 3
Dependent Claim
24 words
The brushless DC motor of claim 1 wherein said plurality of protrusions have a height equal to a depth of said plurality of apertures.
Claim 4
Dependent Claim
22 words
The brushless DC motor of claim 2 wherein each of said at least one stator member comprises at least one pole piece.
Claim 5
Dependent Claim
34 words
The brushless DC motor of claim 3 wherein said at least one pole piece has an associated coil, wherein current through said coil determines a magnetic polarity of said at least one pole piece.
Claim 6
Dependent Claim
22 words
The brushless DC motor of claim 4 wherein said coil forms at least one phase on said at least one stator member.
Claim 7
Dependent Claim
22 words
The brushless DC motor of claim 5 wherein said at least one phase determines an angular movement of said multi-pole composite magnet.
Claim 8
Dependent Claim
15 words
The brushless DC motor of claim 2 wherein said means for positioning comprises a shaft.
Claim 9
Dependent Claim
16 words
The brushless DC motor of claim 7 wherein said means for positioning further comprises a housing.
Claim 10
Dependent Claim
20 words
The brushless DC motor of claim 8 further comprising means for preventing an axial wobble of said multi-pole composite magnet.
Claim 11
Dependent Claim
39 words
The brushless DC motor of claim 9 wherein said means for preventing comprises at least one spacer coupled to said shaft, said at least one spacer having a surface in contact with a surface of said multi-pole composite magnet.
Claim 12
Dependent Claim
18 words
The brushless DC motor of claim 10 wherein said shaft prevents angular slippage of said multi-pole composite magnet.
Claim 13
Dependent Claim
15 words
The brushless DC motor of claim 2 wherein said sensing device includes a Hall sensor.
Claim 14
Dependent Claim
15 words
The brushless DC motor of claim 2 where said sensing device includes an optical encoder.
Claim 15
Dependent Claim
32 words
The brushless DC motor of claim 2 wherein said sensing device includes an encoder which determines the angular position of said multi-pole composite magnet relative to said at least one stator member.
Claim 16
Dependent Claim
17 words
The brushless DC motor of claim 11 wherein said means for providing includes a unipolar drive connection.
Claim 17
Dependent Claim
17 words
The brushless DC motor of claim 11 wherein said means for providing includes a bipolar drive connection.
Claim 18
Dependent Claim
140 words
A brushless DC motor comprising: a multi-pole composite magnet having a first section and a second section, wherein said first and second sections each comprise a hub and a plurality of radial members integrally formed with said hub, wherein said first and second sections are magnetized in an opposite axial direction, and wherein said first and second sections are mated; at least one stator member placed in operative relation to said multi-pole composite magnet; means for positioning said composite magnet and said at least one stator member on a common axis; a sensing device for determining a position of said composite magnet relative to said at least one stator member; and means for providing a magnetic configuration on said stator member, wherein said sensing device provides feedback signals to said means for providing said magnetic configuration on said stator member.
Claim 19
Dependent Claim
140 words
A brushless DC motor comprising: a multi-pole composite magnet having a first section and a second section, wherein said first and second sections each comprise a hub and a plurality of radial members integrally formed with said hub, wherein said first and second sections are magnetized in an opposite axial direction, and wherein said first and second sections are mated; at least one stator member placed in operative relation to said multi-pole composite magnet; means for positioning said composite magnet and said at least one stator member on a common axis; a sensing device for determining a position of said composite magnet relative to said at least one stator member; and means for providing a magnetic configuration on said stator member, wherein said sensing device provides feedback signals to said means for providing said magnetic configuration on said stator member.
Claim 20
Dependent Claim
34 words
The brushless DC motor of claim 17 wherein said plurality of radial members of said first section have a height equal to a height of said plurality of radial members of said second section.
Claim 21
Dependent Claim
22 words
The brushless DC motor of claim 18 wherein each of said at least one stator member comprises a plurality of pole pieces.
Claim 22
Dependent Claim
32 words
The brushless DC motor of claim 19 wherein each of said plurality of pole pieces has an associated coil, wherein current through said coil determines a magnetic polarity of said pole piece.
Claim 23
Dependent Claim
25 words
The brushless DC motor of claim 20 wherein a plurality of said coils form at least one phase on said at least one stator member.
Claim 24
Dependent Claim
22 words
The brushless DC motor of claim 20 wherein said at least one phase determines an angular movement of said multi-pole composite magnet.
Claim 25
Dependent Claim
15 words
The brushless DC motor of claim 19 wherein said means for positioning comprises a shaft.
Claim 26
Dependent Claim
16 words
The brushless DC motor of claim 23 wherein said means for positioning further comprises a housing.
Claim 27
Dependent Claim
20 words
The brushless DC motor of claim 24 further comprising means for preventing an axial wobble of said multi-pole composite magnet.
Claim 28
Dependent Claim
38 words
The brushless DC motor of claim 25 wherein said means for preventing comprises at least one spacer coupled to said shaft, said at least one spacer having a surface flush to a surface of said multi-pole composite magnet.
Claim 29
Dependent Claim
18 words
The brushless DC motor of claim 26 wherein said shaft prevents angular slippage of said multi-pole composite magnet.
Claim 30
Dependent Claim
15 words
The brushless DC motor of claim 17 wherein said sensing device includes a Hall sensor.
Claim 31
Dependent Claim
17 words
The brushless DC motor of claim 24 wherein said means for providing includes a unipolar drive connection.
Claim 32
Dependent Claim
17 words
The brushless DC motor of claim 24 wherein said means for providing includes a bipolar drive connection.
References Cited (Backward Citations)
US2615227A
Cited
GB893986A
Cited
US3319100A
Cited
NL6603196A
Cited
US3541410A
Cited
US3590294A
Cited
US3633138A
Cited
US3742243A
Cited
GB1436716A
Cited
JPS523969A
Cited
US4086519A
Cited
US4187441A
Cited
DE2847203A1
Cited
US4274053A
Cited
EP0020178A1
Cited
DE3026299A1
Cited
US4399595A
Cited
US4406958A
Cited
DE3121334A1
Cited
US4427960A
Cited
US4528473A
Cited
US4820951A
Cited
US4851731A
Cited
SU1617548A1
Cited
GB2228625A
Cited
US4941236A
Cited
JPH0345144A
Cited
JPH0370450A
Cited
US5132581A
Cited
US5148070A
Cited
US5161361A
Cited
US5177393A
Cited
US5218251A
Cited
US5258735A
Cited
US5313159A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-08-07 | 1999-02-06 | 1999-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-08-07 | 2003-02-06 | 2003-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-08-07 | 2007-02-06 | 2007-08-08 | $7700.00 | Window Closed / Lapsed |