US4208784A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for placing and securing magnets in a motor housing
Assignee: BASF SE
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Filing: 1978-09-06
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Granted: 1980-06-24
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Expires: 1998-09-06
Abstract
Abstract An improved technique for the assembly of motors of the type having a printed armature that rotates in a flat, annular air gap between a magnet assembly and a magnetic flux plate, wherein the size of the air gap is accurately maintained at preselected value. In one embodiment of the invention, a precision shim, having a thickness the same as the preselected air gap size, is placed on a flat work surface, the magnet assembly is placed on the shim, and a motor housing is placed over the magnet assembly and shim. An epoxy fill in the housing is compressed as the housing is pressed down over the magnet assembly until a reference surface on the housing contacts the work surface. In an alternate embodiment of the invention, an inner flux plate is formed to include a plurality of tines, so shaped and sized that, when the inner flux plate and the magnet assembly are bonded together and inserted in the housing, the tines provide for a force fit in the housing. The magnet assembly and inner flux plate are pressed into the housing by a press tool with lugs that project from a flat surface of the tool by a distance equal to the preselected size of the air gap.
Inventors
- 👤 Roger S. Kincel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:33
CPC Classifications
H; H02; H02K; H02K15/00; H02K15/16; H02K1/00; H02K1/06; H02K1/12; H02K1/18; H02K1/182; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49009
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
74 words
A method for placing magnets in a motor housing, said method comprising the steps of: forming a reference surface on the motor housing; inserting a magnet assembly into the housing until the magnet assembly is located at a preselected distance from the reference surface; securing the magnet assembly at the preselected distance from the reference surface; and securing an outer flux plate to the reference surface, to form a gap of a preselected size.
Claim 2
Independent Claim
74 words
A method for placing magnets in a motor housing, said method comprising the steps of: forming a reference surface on the motor housing; inserting a magnet assembly into the housing until the magnet assembly is located at a preselected distance from the reference surface; securing the magnet assembly at the preselected distance from the reference surface; and securing an outer flux plate to the reference surface, to form a gap of a preselected size.
Claim 3
Dependent Claim
47 words
A method as set forth in claim 1, wherein said inserting step includes: placing a precision shim on a flat work surface; placing the magnet assembly on the shim; and placing the housing over the magnet assembly with the reference surface in contact with the work surface.
Claim 4
Dependent Claim
53 words
A method as set forth in claim 1, wherein said inserting step includes: pressing the magnet assembly into the housing with a tool having a first surface for contacting the reference surface and a second surface for contacting the magnet assembly, the first and second surfaces being spaced apart by the preselected distance.
Claim 5
Dependent Claim
47 words
A method as set forth in claim 1 or 2 or 3, wherein said step of securing the magnet assembly includes: placing an adhesive material in said housing; compressing the adhesive material during said inserting step; and allowing the adhesive material to set after said inserting step.
Claim 6
Dependent Claim
66 words
A method as set forth in claim 1 or 2 or 3, wherein said step of securing the magnet assembly includes: securing the magnet assembly to a plate prior to said inserting step; and force-fitting the plate in the housing during said inserting step; whereby the plate and the magnet assembly are held in place by friction forces between portions of the plate and the housing.
Claim 7
Independent Claim
132 words
A method of assembling a motor having a housing, a magnet assembly, and at least one magnetic flux plate, said method comprising the steps of: forming a reference surface on an open end of the housing; placing a precision shim of a preselected thickness on a flat work surface; securing the magnet assembly and flux plate together; placing the magnet assembly and flux plate together on the shim; positioning an adhesive material between the flux plate and the housing; pressing the housing down over the magnet assembly until the reference surface contacts the work surface; allowing the adhesive material to set, to secure the magnet assembly at a preselected distance from the reference surface; and then securing an additional flux plate against the reference surface, to obtain a gap of preselected length.
Claim 8
Independent Claim
132 words
A method of assembling a motor having a housing, a magnet assembly, and at least one magnetic flux plate, said method comprising the steps of: forming a reference surface on an open end of the housing; placing a precision shim of a preselected thickness on a flat work surface; securing the magnet assembly and flux plate together; placing the magnet assembly and flux plate together on the shim; positioning an adhesive material between the flux plate and the housing; pressing the housing down over the magnet assembly until the reference surface contacts the work surface; allowing the adhesive material to set, to secure the magnet assembly at a preselected distance from the reference surface; and then securing an additional flux plate against the reference surface, to obtain a gap of preselected length.
Claim 9
Independent Claim
127 words
A method of assembling a motor having a housing, a magnet assembly, and an inner magnetic flux plate, said method comprising the steps of: forming a reference surface on an open end of said housing; forming the inner flux plate to include projecting yieldable portions such that the outer dimensions of the flux plate exceed the inner dimensions of the housing; securing the inner flux plate and magnet assembly together; inserting the inner flux plate and magnet assembly in the housing; pressing the inner flux plate and magnet assembly into the housing until the magnet assembly is positioned at a predetermined distance beyond the reference surface; and securing an outer flux plate to the reference surface, to obtain a gap of length equal to the predetermined distance.
Claim 10
Independent Claim
127 words
A method of assembling a motor having a housing, a magnet assembly, and an inner magnetic flux plate, said method comprising the steps of: forming a reference surface on an open end of said housing; forming the inner flux plate to include projecting yieldable portions such that the outer dimensions of the flux plate exceed the inner dimensions of the housing; securing the inner flux plate and magnet assembly together; inserting the inner flux plate and magnet assembly in the housing; pressing the inner flux plate and magnet assembly into the housing until the magnet assembly is positioned at a predetermined distance beyond the reference surface; and securing an outer flux plate to the reference surface, to obtain a gap of length equal to the predetermined distance.
Claim 11
Dependent Claim
70 words
A method as set forth in claim 7, wherein said pressing step includes: placing a precision shim having the same thickness as the predetermined distance on a flat work surface; placing the magnet assembly and inner flux plate on the shim; placing an adhesive material between the inner flux plate and the housing; and pressing the housing down around the magnet assembly until the reference surface contacts the work surface.
Claim 12
Dependent Claim
58 words
A method as set forth in claim 7, wherein said pressing step includes: pressing said magnet assembly with a tool having a first surface for contacting the magnet assembly only, and a second surface for contacting the reference surface only, wherein the first and second surfaces are spaced apart by the predetermined distance desired for the gap length.
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) | 1983-06-24 | 1983-12-24 | 1984-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-06-24 | 1987-12-24 | 1988-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-06-24 | 1991-12-24 | 1992-06-24 | $7700.00 | Window Closed / Lapsed |