Patent US6169484B1 successfully refreshed from Google Patents.
Patent US3852626A successfully refreshed from Google Patents.
US3852626A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Linear induction motor
Assignee: Individual
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Filing: 1973-03-09
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Granted: 1974-12-03
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Expires: 1993-03-09
Abstract
Abstract A linear induction motor including primary cores or blocks having a set of primary field windings thereon, secondary cores and an elongated metal channel having an upper surface with the primary and secondary cores arranged on opposite sides thereof. The upper channel surface has a central slit extending the full length thereof to form a pair of coplanar strips which serve as secondary conductors. Electrically energized bands are arranged within and extend along the length of the channel and are slidably contacted by brushes or the like to energize the primary field windings. The cores and brushes are mounted on a support to form a unit which moves linearly along the length of the channel.
Inventors
- 👤 M Davis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:37
CPC Classifications
H; H02; H02K; H02K41/00; H02K41/02; H02K41/025; E; E05; E05F; E05F15/00; E05F15/60; E05Y; E05Y2400/00; E05Y2400/65; E05Y2400/656; E05Y2600/00; E05Y2600/40; E05Y2600/456; E05Y2900/00; E05Y2900/10; E05Y2900/106
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
264 words
In a linear induction motor including primary field windings, an elongated metal channel having an upper, flat base, the base having a central slit extending the full length thereof to form a pair of co-planar strips with the strips thus forming secondary conductors, and means for electrically energizing the primary field windings, the improvement comprising: two flat, plate-like, primary cores of magnetically permeable material, each arranged above one of said coplanar strips and each of said primary cores having a plurality of transverse slots with the slots in each primary core opposing and aligned with a corresponding slot in the other primary core, and further having one set of primary field windings linking both primary cores without end turns therebetween by extending from a slot in one primary core directly to the opposed, aligned corresponding slot in said other primary core, two flat, plate-like secondary cores of magnetically permeable material, each arranged below one of said coplanar strips and aligned beneath one of said primary cores with each secondary core having substantially the same surface area as its aligned primary core, means extending through said slit and between said strips for rigidly spacing one of said primary cores from the other and for interconnecting bOth of said primary cores and both of said secondary cores to form a unit, whereby upon the energization of said primary field windings to cause the primary core-secondary core unit to move linearly along the length of said channel, the alignment of said cores establishes only usable magnetic flux paths from each primary core to its aligned secondary core.
Claim 2
Dependent Claim
264 words
In a linear induction motor including primary field windings, an elongated metal channel having an upper, flat base, the base having a central slit extending the full length thereof to form a pair of co-planar strips with the strips thus forming secondary conductors, and means for electrically energizing the primary field windings, the improvement comprising: two flat, plate-like, primary cores of magnetically permeable material, each arranged above one of said coplanar strips and each of said primary cores having a plurality of transverse slots with the slots in each primary core opposing and aligned with a corresponding slot in the other primary core, and further having one set of primary field windings linking both primary cores without end turns therebetween by extending from a slot in one primary core directly to the opposed, aligned corresponding slot in said other primary core, two flat, plate-like secondary cores of magnetically permeable material, each arranged below one of said coplanar strips and aligned beneath one of said primary cores with each secondary core having substantially the same surface area as its aligned primary core, means extending through said slit and between said strips for rigidly spacing one of said primary cores from the other and for interconnecting bOth of said primary cores and both of said secondary cores to form a unit, whereby upon the energization of said primary field windings to cause the primary core-secondary core unit to move linearly along the length of said channel, the alignment of said cores establishes only usable magnetic flux paths from each primary core to its aligned secondary core.
Claim 3
Dependent Claim
120 words
The improvement of claim 1 wherein said rigidly spacing means has transverse slots therein aligned with said slots in said primary cores, said primary field windings are formed on said primary cores without end turns between the cores by extending each winding across one of said primary cores, directly through said aligned slot in said rigidly spacing means and across the other of said primary cores, whereby end turns in the region between the two primary cores is eliminated, thereby reducing both the total amount of copper required for the primary field windings and the power loss associated therewith, and whereby the two primary cores may be located closer together since clearance for end turns therebetween is no longer needed.
Claim 4
Dependent Claim
88 words
The improvement of claim 1 and further including: a first set of primary field windings associated with said two primary cores, a second set of primary field windings associated with said two secondary cores, and wherein said rigidly spacing means further attaches one of said secondary cores to the other of said secondary cores, whereby each primary core also functions as a secondary core and each secondary core also functions as a primary core, and said coplanar strips function as a secondary conductor for all of said cores.
Claim 5
Dependent Claim
46 words
The improvement of claim 3 wherein: said second set of primary field windings are formed on said secondary cores without end turns therebetween by extending each winding across one of said secondary cores, through said rigidly spacing means, and across the other of said secondary cores.
Claim 6
Dependent Claim
162 words
In a linear induction motor including a field winding, an elongated metal channel having an upper, flat base, the base having a central slit extending the full length thereof and having at least one longitudinal strip thus forming a secondary conductor, and means for electrically energizing the field winding, the improvement comprising: first and second flat cores of magnetically permeable material, each of said flat cores having transverse slots aligned with and opposing the slots in said other flat core and corresponding thereto, said first and second cores arranged adjacent to said strip, rigid spacer means for interconnecting both of said cores to form a single unit, and said field windings being formed on both said cores without end turns therebetween, by extending each winding from one slot in one of said cores directly to the opposing slot in said other core, whereby the energization of said field windings causes the single unit to move linearly along the length of said channel.
Claim 7
Dependent Claim
162 words
In a linear induction motor including a field winding, an elongated metal channel having an upper, flat base, the base having a central slit extending the full length thereof and having at least one longitudinal strip thus forming a secondary conductor, and means for electrically energizing the field winding, the improvement comprising: first and second flat cores of magnetically permeable material, each of said flat cores having transverse slots aligned with and opposing the slots in said other flat core and corresponding thereto, said first and second cores arranged adjacent to said strip, rigid spacer means for interconnecting both of said cores to form a single unit, and said field windings being formed on both said cores without end turns therebetween, by extending each winding from one slot in one of said cores directly to the opposing slot in said other core, whereby the energization of said field windings causes the single unit to move linearly along the length of said channel.
Claim 8
Dependent Claim
65 words
The improvement of claim 5 wherein said base has a central slit to form a pair of longitudinal strips, and further including: a pair of magnetically permeable cores located on said longitudinal strips to serve as secondary cores for said first and second cores, whereby said secondary cores remain stationary on said longitudinal strips while said first and second cores move linearly along said channel.
Claim 9
Dependent Claim
120 words
The improvement of claim 5 and further including: third and fourth magnetically permeable cores of substantially the same surface area as said first and second cores, said third core being disposed on the opposite side of the channel from the first core and aligned therewith, said fourth core being disposed on the opposite side of the channel from the second core and aligned therewith, and said rigid spacer means further extending to interconnect all of said cores to form a single unit, whereby upon the energization of said field windings to cause the single unit to move linearly along the length of the channel, the alignment of cores establishes only usable magnetic flux paths between said aligned pairs of cores.
Claim 10
Dependent Claim
51 words
The improvement of claim 7 and further including: field windings formed on said third and fourth cores without end turns therebetween, whereby each of the cores functions as a primary core and as the secondary core for the core disposed on the opposite side of the channel therefrom and aligned therewith.
Claim 11
Dependent Claim
174 words
In a linear induction motor including field windings, an elongated, flat metal plate having first and second longitudinal sides with the plate thus forming a secondary conductor and means for electrically energizing the field windings, the improvement comprising: first and second flat cores of magnetically permeable material, said cores aligned adjacent said plate and having aligned directly opposed field winding slots, said secondary conductor being made of electrically conductive material, means extending across said plate for rigidly spacing said first core from said second core and for interconnecting and insulating both of said cores to form a single unit, said spacing means having slots aligned with said aligned field winding slots in said cores, and said field windings being formed on both said cores, without end turns therebetween by extending each winding from the slot in one of said cores, through the aligned slot in said spacing means and through the opposed slot in said other core, whereby the energization of said field windings causes the single unit to move longitudinally along said plate.
Claim 12
Dependent Claim
174 words
In a linear induction motor including field windings, an elongated, flat metal plate having first and second longitudinal sides with the plate thus forming a secondary conductor and means for electrically energizing the field windings, the improvement comprising: first and second flat cores of magnetically permeable material, said cores aligned adjacent said plate and having aligned directly opposed field winding slots, said secondary conductor being made of electrically conductive material, means extending across said plate for rigidly spacing said first core from said second core and for interconnecting and insulating both of said cores to form a single unit, said spacing means having slots aligned with said aligned field winding slots in said cores, and said field windings being formed on both said cores, without end turns therebetween by extending each winding from the slot in one of said cores, through the aligned slot in said spacing means and through the opposed slot in said other core, whereby the energization of said field windings causes the single unit to move longitudinally along said plate.
Claim 13
Dependent Claim
71 words
The improvement of claim 9 and further including: a longitudinal support channel having said plate secured thereto, said cores and field windings being positioned in said channel, and stationary secondary cores of magnetically permeable material affixed to said secondary conductors, whereby the energization of said field windings causes the single unit to move linearly with respect to said plate and channel, with said channel providing a guideway for said single unit.
Claim 14
Dependent Claim
17 words
The improvement of claim 10 wherein said channel and plate are integrally formed as an elongated extrusion.
Claim 15
Dependent Claim
160 words
The improvement of claim 9 and further including a longitudinal support channel secured to said plate, wherein said elongated plate is disposed in said channel to define a plurality of elongated tracks, said first and second cores being disposed in two of said tracks, and further including: third and fourth magnetically permeable cores, spaced from each other and said first and second cores by said spacing means whereby the four cores form a single unit, said third and fourth cores being of the same surface area as said first and second cores, respectively, field windings being formed on said third and fourth cores without end turns therebetween by extending each winding from one of said cores, through said spacing means, and across said other core, whereby the energization of said field windings causes the single unit to move linearly within said channel with each core serving both as a primary core and as a secondary core for the opposed core.
Claim 16
Dependent Claim
91 words
The improvement of claim 9 wherein said first and second cores are aligned on opposite longitudinal sides of said plate, and wherein said cores have a plurality of core teeth defining said slots between said core teeth, said teeth faces on said first core being spaced apart and opposite to the teeth faces on said second core, and each field winding is a closed conductive loop shaped as a saddle, said loop having a front portion and a rear portion with the front being wider and higher than the rear portion.
Claim 17
Dependent Claim
18 words
The improvement of claim 13 including an elongated channel integrally formed with said elongated plate as an extrusion.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-12-02 | 1978-06-03 | 1978-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-02 | 1982-06-03 | 1982-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-02 | 1986-06-03 | 1986-12-03 | $7700.00 | Window Closed / Lapsed |