US3697841A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Induction motor structure and reversing circuit therefor
Assignee: Whirlpool Corp
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Filing: 1971-04-16
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Granted: 1972-10-10
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Expires: 1991-04-16
Abstract
Abstract An induction motor having a squirrel cage rotor is provided with an additional stator winding which when energized in proper sequence with the original stator winding causes a rapid reversal of the motor. The additional stator winding may be located on the same axis as the original stator winding or may be spaced 90 electrical degrees from the original winding.
Inventors
- 👤 Arne M Nystuen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 12:11
CPC Classifications
H; H02; H02P; H02P23/00; H02P23/24
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
100 words
The method of reversing an induction motor provided with a rotor and having first and second stator windings comprising: applying an alternating voltage wave having zero crossings to the first of said stator windings to effect rotation of said rotor in a first direction; removing said alternating voltage wave from said first winding in response to and substantially at a selected zero voltage crossing of said wave; and applying said voltage wave to said second stator winding in response to and at said selected zero voltage crossing of said wave to effect rotation of said rotor in a second direction.
Claim 2
Independent Claim
100 words
The method of reversing an induction motor provided with a rotor and having first and second stator windings comprising: applying an alternating voltage wave having zero crossings to the first of said stator windings to effect rotation of said rotor in a first direction; removing said alternating voltage wave from said first winding in response to and substantially at a selected zero voltage crossing of said wave; and applying said voltage wave to said second stator winding in response to and at said selected zero voltage crossing of said wave to effect rotation of said rotor in a second direction.
Claim 3
Dependent Claim
35 words
The method of claim 1 further including the step of transferring the alternating voltage wave from said second winding back to said first winding before steady state current conditions have been established within the motor.
Claim 4
Dependent Claim
39 words
The method of claim 1 further including the step of transferring the alternating voltage wave from said second winding back to said first winding after said second winding has been energized for one-half cycle of said alternating voltage wave.
Claim 5
Dependent Claim
46 words
The method of claim 1 further including the step of transferring the alternating voltage wave from said second winding back to said first winding after said second winding has been re-energized for a period comprising an odd number of half cycles of said alternating voltage wave.
Claim 6
Independent Claim
84 words
The method of generating a large torque pulse of short Duration within an induction motor provided with a rotor and having two stator windings comprising: applying an alternating voltage wave having zero crossings to a first of said stator windings; removing said alternating voltage wave from said first winding in response to and substantially at a selected zero voltage crossing of said wave; and applying said alternating voltage wave to said second stator winding at said selected zero crossing of said alternating voltage wave.
Claim 7
Independent Claim
84 words
The method of generating a large torque pulse of short Duration within an induction motor provided with a rotor and having two stator windings comprising: applying an alternating voltage wave having zero crossings to a first of said stator windings; removing said alternating voltage wave from said first winding in response to and substantially at a selected zero voltage crossing of said wave; and applying said alternating voltage wave to said second stator winding at said selected zero crossing of said alternating voltage wave.
Claim 8
Dependent Claim
88 words
A motor reversing circuit comprising: input terminals for receiving an alternating voltage wave having cyclic zero crossover points; a rotor; first and second stator windings inductively coupled to said rotor and connected in opposite polarity sense across said input terminals; and reversing means including switching means serially interposed in the connection between respective ones of said windings and said input terminals, said switching means being operative in response to and at selected zero crossing points of said alternating voltage wave to selectively transfer power between said stator windings.
Claim 9
Dependent Claim
88 words
A motor reversing circuit comprising: input terminals for receiving an alternating voltage wave having cyclic zero crossover points; a rotor; first and second stator windings inductively coupled to said rotor and connected in opposite polarity sense across said input terminals; and reversing means including switching means serially interposed in the connection between respective ones of said windings and said input terminals, said switching means being operative in response to and at selected zero crossing points of said alternating voltage wave to selectively transfer power between said stator windings.
Claim 10
Dependent Claim
18 words
The circuit of claim 6 wherein said first and second stator windings are wound about the same axis.
Claim 11
Dependent Claim
16 words
The circuit of claim 6 wherein said first and second windings are spaced 90 electrical degrees.
Claim 12
Dependent Claim
16 words
A motor reversing circuit according to claim 6, wherein said switching means includes semiconductor switch means.
Claim 13
Dependent Claim
103 words
A reversible induction motor circuit comprising: a rotor; a stator structure including a laminated core and first and second stator windings wound on said core and inductively coupled to said rotor, said stator windings defining a plurality of poles and each of said stator windings having input terminals for receiving an alternating voltage wave having periodic zero crossover points; and means for reversing the direction of rotation of the motor including switching means connected to said input terminals for selectively transferring the application of alternating voltage between said stator windings in response to and at selected zero crossover points of the alternating wave.
Claim 14
Dependent Claim
103 words
A reversible induction motor circuit comprising: a rotor; a stator structure including a laminated core and first and second stator windings wound on said core and inductively coupled to said rotor, said stator windings defining a plurality of poles and each of said stator windings having input terminals for receiving an alternating voltage wave having periodic zero crossover points; and means for reversing the direction of rotation of the motor including switching means connected to said input terminals for selectively transferring the application of alternating voltage between said stator windings in response to and at selected zero crossover points of the alternating wave.
Claim 15
Dependent Claim
18 words
The circuit of claim 10 wherein said first and second stator windings are wound about the same axis.
Claim 16
Dependent Claim
16 words
The circuit of claim 10 wherein said first and second windings are spaced 90 electrical degrees.
Claim 17
Dependent Claim
16 words
A motor reversing circuit according to claim 10, wherein said switching means includes semiconductor switch means.
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) | 1975-10-10 | 1976-04-10 | 1976-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-10 | 1980-04-10 | 1980-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-10 | 1984-04-10 | 1984-10-10 | $7700.00 | Window Closed / Lapsed |