US3612925A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Induction motor rotor and method of making same
Assignee: Dynamics Corp of America
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Filing: 1970-02-24
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Granted: 1971-10-12
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Expires: 1990-02-24
Abstract
Abstract An induction motor rotor in which conducting bars and end rings are preformed ladderlike for insertion in the slots and the bars have the same circumferential widths as the lands of the laminated core between them and substantially the same radial thickness as the radial depth of the slots in which they rest. The bars are stamped without waste of material from heavy strip stock to provide interdigitating fingers whose length is at least 50 percent of the slot length and provide identical half-ladder units which are then shaped to the rotor slot pattern and inserted in the rotor slots where they are induction soldered for circuit continuity and conductivity.
Inventors
- 👤 Roy L Swanke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:35
CPC Classifications
H; H02; H02K; H02K17/00; H02K17/02; H02K17/16; H02K17/168
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
110 words
The method of making an induction motor rotor, comprising, forming a cylindrical core of paramagnetic material defining longitudinal slots circumferentially spaced from each other a distance substantially equal to their circumferential width, stamping a strip of heavy electrical conductive material to form two comblike units having teeth whose widths are substantially equal and are integrally connected along one of their ends by a conductor, curling the units to a form defining a surface of revolution to bring the teeth in juxtaposition with respect to said slots, forcing said teeth of at least One unit into said slots, and joining the other ends of the teeth in electrically conductive circuit continuity.
Claim 2
Independent Claim
110 words
The method of making an induction motor rotor, comprising, forming a cylindrical core of paramagnetic material defining longitudinal slots circumferentially spaced from each other a distance substantially equal to their circumferential width, stamping a strip of heavy electrical conductive material to form two comblike units having teeth whose widths are substantially equal and are integrally connected along one of their ends by a conductor, curling the units to a form defining a surface of revolution to bring the teeth in juxtaposition with respect to said slots, forcing said teeth of at least One unit into said slots, and joining the other ends of the teeth in electrically conductive circuit continuity.
Claim 3
Dependent Claim
24 words
The method defined in claim 1 in which the teeth forcing step includes forcing said teeth in an axial direction longitudinally of the slots.
Claim 4
Dependent Claim
24 words
The method of claim 1 in which said juxtaposition includes the moving of said teeth radially from an inclined position progressively into said slots.
Claim 5
Independent Claim
108 words
The method of making an induction motor rotor, comprising, forming a cylindrical core of paramagnetic material defining longitudinal slots circumferentially spaced from each other a distance substantially equal to their circumferential width, stamping a strip of heavy electrical conductive material to form two comblike units having teeth whose widths are substantially equal and are integrally connected along one end, curling the units to a form defining a surface of revolution to bring the teeth in juxtaposition with respect to said slots, forcing said teeth into said slots, and induction soldering the elements where they are in engagement contact with each other to provide circuit continuity and electrical conduction.
Claim 6
Independent Claim
108 words
The method of making an induction motor rotor, comprising, forming a cylindrical core of paramagnetic material defining longitudinal slots circumferentially spaced from each other a distance substantially equal to their circumferential width, stamping a strip of heavy electrical conductive material to form two comblike units having teeth whose widths are substantially equal and are integrally connected along one end, curling the units to a form defining a surface of revolution to bring the teeth in juxtaposition with respect to said slots, forcing said teeth into said slots, and induction soldering the elements where they are in engagement contact with each other to provide circuit continuity and electrical conduction.
Claim 7
Dependent Claim
57 words
The method defined in claim 1 in which the teeth of the two units are collectively of a length substantially equal to the length of the rotor stack and advancing them in the slots, forcing the aligned pairs of teeth into terminal engagement with each other in each slot, and soldering their contacting ends for electrical conductivity.
Claim 8
Dependent Claim
25 words
The method defined in claim 5 in which the teeth of the two units are of equal length one-half the length of the rotor stack.
Claim 9
Dependent Claim
18 words
The method defined in claim 1 including dynamically balancing the rotor by localized radially displacing the conductive material.
Claim 10
Dependent Claim
111 words
For use to dovetail in the slots of a rotor of an induction motor a plurality of preformed comblike cage units of electrically conductive material whose backing edge is of a length approximately that of the circumference of the rotor and whose teeth are of a length less than the length of the slots in the rotor, said backing edge being shaped to match the curvature of the rotor with its ends in end-abutting relationship to serve as electrical conductive end rings and said teeth are received in end engaged relation to serve as conductor bars in which the width of each tooth element is equal to the space between them.
Claim 11
Dependent Claim
111 words
For use to dovetail in the slots of a rotor of an induction motor a plurality of preformed comblike cage units of electrically conductive material whose backing edge is of a length approximately that of the circumference of the rotor and whose teeth are of a length less than the length of the slots in the rotor, said backing edge being shaped to match the curvature of the rotor with its ends in end-abutting relationship to serve as electrical conductive end rings and said teeth are received in end engaged relation to serve as conductor bars in which the width of each tooth element is equal to the space between them.
Claim 12
Dependent Claim
109 words
For use to dovetail in the slots of a rotor of an induction motor, at least two preformed comblike cage units of electrically conductive material employed with each rotor and whose teeth are of a length less than the length of the slots and the units are shaped to match the curvature of the rotor to serve as conductor bar portions in which the width of each tooth element is equal to the space between them, said units having their teeth in end abutting relationship and all teeth are substantially equal in size and shape with abutting teeth providing a bar length equal to the length of the slots.
Claim 13
Dependent Claim
109 words
For use to dovetail in the slots of a rotor of an induction motor, at least two preformed comblike cage units of electrically conductive material employed with each rotor and whose teeth are of a length less than the length of the slots and the units are shaped to match the curvature of the rotor to serve as conductor bar portions in which the width of each tooth element is equal to the space between them, said units having their teeth in end abutting relationship and all teeth are substantially equal in size and shape with abutting teeth providing a bar length equal to the length of the slots.
Claim 14
Dependent Claim
19 words
The method defined in claim 1 including dynamically balancing the rotor by radially displacing the conductor at localized points.
Claim 15
Dependent Claim
83 words
In an induction motor a rotor comprising a lamination stack having longitudinally extending slots and lands that circumferentially are of the same width, conduction bars in said slots integrally stamped from heavy strip stock with an end ring conductor at least at one end of the stack, the circumferential width of the bars being equal to that of the lands, said bars being swaged in a radial direction in the slots and dynamically balanced by localized radial displacement of the end ring conductor.
Claim 16
Dependent Claim
83 words
In an induction motor a rotor comprising a lamination stack having longitudinally extending slots and lands that circumferentially are of the same width, conduction bars in said slots integrally stamped from heavy strip stock with an end ring conductor at least at one end of the stack, the circumferential width of the bars being equal to that of the lands, said bars being swaged in a radial direction in the slots and dynamically balanced by localized radial displacement of the end ring conductor.
References Cited (Backward Citations)
US1875204A
Cited
US2012021A
Cited
US1919995A
Cited
DE704085C
Cited
US2387073A
Cited
US2514116A
Cited
US2786953A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-10-11 | 1975-04-12 | 1975-10-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-11 | 1979-04-12 | 1979-10-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-11 | 1983-04-12 | 1983-10-12 | $7700.00 | Window Closed / Lapsed |