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US3238403A Expired / Lapsed US ⏱️ 0.0 years remaining

Induction motors

Assignee: Emerson Electric Co
•
Filing: 1960-10-27
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Granted: 1966-03-01
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Expires: 1980-10-27
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Abstract

No abstract record available.

Inventors

  • 👤 Francis J Sauer

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-29 04:46
CPC Classifications
H; H02; H02K; H02K3/00; H02K3/04; H02K3/28

Claims Analysis

Total Claims: 2
Claim 1
Independent Claim 225 words
A THREE-PHASE INDUCTION MOTOR HAVING AN INTEGRAL MULTIPLE OF FOUR POLES, COMPRISING A ROTOR AND A WOUND SLOTTED STATOR HAVING A NUMBER OF PAIRS OF SUBSTANTIALLY IDENTICAL OPPOSITELY DISPOSED COIL SETS EQUAL TO THREEFOURTHS THE NUMBER OF POLES, THE COIL SETS OF EACH OF THE PAIRS OF COIL SETS BEING ELECTRICALLY CONNECTED IN PARALLEL TO ONE PHASE TO PRODUCE WITHIN THEIR COMPASSES POLES OF THE SAME POLARITY, AND EACH OF SAID COIL SETS HAVING A PLURALITY OF NESTED COILS THE OUTERMOST OF WHICH COILS SPANS ON THE ORDER OF 240 ELECTRICAL DEGREES, THE END WIRE OF HALF OF THE COIL SETS CONNECTED TO EACH PHASE BEING OUTBOARD RADIALLY OF THE END WIRE OF THE OTHER HALF OF THE COIL SETS, SUCCESSIVE OUTBOARD COIL SETS BEING ELECTRICALLY CONNECTED TO SUCCESSIVE PHASES AND DISPLACED 240 ELECTRICAL DEGREES FROM ONE ANOTHER AND 120 ELECTRICAL DEGREES FROM SUCCESSIVE INBOARD COIL SETS, AND A NUMBER OF THERMAL PROTECTORS EQUAL TO ONE HALF THE NUMBER OF POLES, SAID THERMAL PROTECTORS BEING SUBSTANTIALLY EQUISPACED ABOUT THE STATOR BORE AND EACH BEING POSITIONED IN AN AREA DEFINED BY THE END WIRES OF THE OUTER COILS OF ADJACENT COIL SETS OF TWO DIFFERENT PHASES AND THE CENTER SPAN OF A COIL SET OF THE THIRD PHASE, WHEREBY EACH OF THE THERMAL PROTECTORS IS IN DIRECT HEAT SENSING RELATION TO COILS OF ALL THREE PHASES.
Claim 2
Dependent Claim 225 words
A THREE-PHASE INDUCTION MOTOR HAVING AN INTEGRAL MULTIPLE OF FOUR POLES, COMPRISING A ROTOR AND A WOUND SLOTTED STATOR HAVING A NUMBER OF PAIRS OF SUBSTANTIALLY IDENTICAL OPPOSITELY DISPOSED COIL SETS EQUAL TO THREEFOURTHS THE NUMBER OF POLES, THE COIL SETS OF EACH OF THE PAIRS OF COIL SETS BEING ELECTRICALLY CONNECTED IN PARALLEL TO ONE PHASE TO PRODUCE WITHIN THEIR COMPASSES POLES OF THE SAME POLARITY, AND EACH OF SAID COIL SETS HAVING A PLURALITY OF NESTED COILS THE OUTERMOST OF WHICH COILS SPANS ON THE ORDER OF 240 ELECTRICAL DEGREES, THE END WIRE OF HALF OF THE COIL SETS CONNECTED TO EACH PHASE BEING OUTBOARD RADIALLY OF THE END WIRE OF THE OTHER HALF OF THE COIL SETS, SUCCESSIVE OUTBOARD COIL SETS BEING ELECTRICALLY CONNECTED TO SUCCESSIVE PHASES AND DISPLACED 240 ELECTRICAL DEGREES FROM ONE ANOTHER AND 120 ELECTRICAL DEGREES FROM SUCCESSIVE INBOARD COIL SETS, AND A NUMBER OF THERMAL PROTECTORS EQUAL TO ONE HALF THE NUMBER OF POLES, SAID THERMAL PROTECTORS BEING SUBSTANTIALLY EQUISPACED ABOUT THE STATOR BORE AND EACH BEING POSITIONED IN AN AREA DEFINED BY THE END WIRES OF THE OUTER COILS OF ADJACENT COIL SETS OF TWO DIFFERENT PHASES AND THE CENTER SPAN OF A COIL SET OF THE THIRD PHASE, WHEREBY EACH OF THE THERMAL PROTECTORS IS IN DIRECT HEAT SENSING RELATION TO COILS OF ALL THREE PHASES.

References Cited (Backward Citations)

US2888644A Cited
US1949424A Cited
US2671879A Cited
DE1001397B Cited
US2783403A Cited
US2905840A Cited
US2947894A Cited
US2989654A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1969-02-28 1969-08-30 1970-03-01 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1973-02-28 1973-08-30 1974-03-01 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1977-02-28 1977-08-30 1978-03-01 $7700.00 Window Closed / Lapsed

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