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 Title: |
US4467257:
Multiple speed induction motor
[ Derwent Title ]
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| Country: |
US United States of America
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| Inventor: |
Douthart, Robert H.; Burlington, NC
Smith, Howard W.; West Carrollton, OH
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| Assignee: |
A. O. Smith Corporation, Milwaukee, WI
other patents from A. O. SMITH CORPORATION (32095) (approx. 310)
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| Published / Filed: |
1984-08-21
/ 1982-10-07
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| Application Number: |
US1982000433244
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| IPC Code: |
Advanced:
H02P 1/42;
H02P 25/20;
Core:
H02P 1/16;
H02P 25/16;
IPC-7:
H02P 1/48;
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| U.S. Class: |
Current:
318/774;
318/786;
Original:
318/774;
318/786;
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| Field of Search: |
318/773,774,775,786,787,790,785,793
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| Priority Number: |
| 1982-10-07 |
US1982000433244 |
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| Abstract: |
An AC induction motor has a two-pole run winding connected directly to power, a four-pole run winding connected to power by a "Triac" switch, and a separate start winding connected to power by a "Triac" switch and a centrifugal start switch. The centrifugal switch is connected between a common node to the start "Triac" and either one or the other of the power terminals. The motor always starts as a two-pole start and two-pole run winding motor. Depending upon the power terminal connection, the motor continues to run with power supplied to the two-pole run winding, or actuate the "Triac" switch of the four-pole winding to operate as a four-pole motor. In different embodiments, the centrifugal switch is connected between the start circuit terminal and either the power terminal of the four-pole winding or of the two-pole winding.
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| Attorney, Agent or Firm: |
Andrus, Sceales, Starke & Sawall ;
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| Primary / Asst. Examiners: |
Smith, Jr., David;
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| INPADOC Legal Status: |
Show legal status actions
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| Family: |
None
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First Claim:
Show all 19 claims |
We claim:
1. A multiple speed motor comprising a first speed winding means, a second speed winding means, a start winding means, three power terminals including a first power terminal connected to the first speed winding and a second power terminal connected to the second speed winding and a common power terminal connected to said first and second speed windings, first and second separate switch means for said start winding means and for the second of said first and second speed winding means, a speed responsive switch means, circuit means connecting said start winding means to said common power terminal and to one of said first and second power terminals and connecting said start winding means to the other of said first and second power terminals in series with said speed responsive switch means, and said separate switch means and said speed responsive switch means being constructed and connected to conjointly operate to simultaneously energize said first speed winding and said start winding during an initial start period and at selected speed operable to de-energize said start winding and to energize only one of said first speed winding and said second speed winding in accordance with the power connection to said first and second power terminals.
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| Background / Summary: |
Show background / summary
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| Drawing Descriptions: |
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| Description: |
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| Forward References: |
Show 18 U.S. patent(s) that reference this one
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