Patent US4465962A successfully refreshed from Google Patents.
US4465962A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Permanent split capacitor single phase electric motor system
Assignee: Westinghouse Electric Corp
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Filing: 1983-03-28
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Granted: 1984-08-14
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Expires: 2003-03-28
Abstract
Abstract A permanent split capacitor single phase electric motor achieves balanced operation at more than one operating point by adjusting the voltage supplied to the main and auxiliary windings and adjusting the capacitance in the auxiliary winding circuit. An intermediate voltage tap on an autotransformer supplies voltage to the main winding for low speed operation while a capacitive voltage divider is used to adjust the voltage supplied to the auxiliary winding for low speed operation.
Inventors
- 👤 Herbert S. Kirschbaum
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:31
CPC Classifications
H; H02; H02P; H02P25/00; H02P25/16; H02P25/24
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
205 words
An alternating current electric motor system comprising: a pair of line terminals for connection to an alternating current power source having a first voltage; an autotransformer connected to said line terminals for producing a second voltage on a first intermediate voltage terminal; a first stator winding; means for connecting said first stator winding between said line terminals for operation at a first speed; means for connecting said first stator winding between one of said line terminals and said first intermediate voltage terminal for operation at a second speed; a capacitive voltage divider connected to said line terminals for producing a third voltage on a second intermediate voltage terminal, with said second intermediate voltage terminal being a connection within said capacitive voltage divider; a first capacitor; a second stator winding being connected in series with said first capacitor to form a circuit branch which is connected to said line terminals; means for connecting said second stator winding between one of said line terminals and said second intermediate voltage terminal for operation at said second speed; and wherein said capacitive voltage divider includes a second and a third capacitor connected in series with said second intermediate voltage terminal being the connection between said second and third capacitors.
Claim 2
Dependent Claim
205 words
An alternating current electric motor system comprising: a pair of line terminals for connection to an alternating current power source having a first voltage; an autotransformer connected to said line terminals for producing a second voltage on a first intermediate voltage terminal; a first stator winding; means for connecting said first stator winding between said line terminals for operation at a first speed; means for connecting said first stator winding between one of said line terminals and said first intermediate voltage terminal for operation at a second speed; a capacitive voltage divider connected to said line terminals for producing a third voltage on a second intermediate voltage terminal, with said second intermediate voltage terminal being a connection within said capacitive voltage divider; a first capacitor; a second stator winding being connected in series with said first capacitor to form a circuit branch which is connected to said line terminals; means for connecting said second stator winding between one of said line terminals and said second intermediate voltage terminal for operation at said second speed; and wherein said capacitive voltage divider includes a second and a third capacitor connected in series with said second intermediate voltage terminal being the connection between said second and third capacitors.
Claim 3
Dependent Claim
35 words
An alternating current electric motor system as recited in claim 1, wherein said first, second and third voltage levels are adjusted to achieve substantially balanced motor operation at both said first and said second speeds.
Claim 4
Dependent Claim
210 words
An alternating current electric motor system comprising: a pair of line terminals for connection to an alternating current power source having a first voltage; means connected to said line terminals for producing a second voltage on a first intermediate voltage terminal; a first stator winding; means for connecting said first stator winding between said line terminals for operation at a first speed; means for connecting said first stator winding between one of said line terminals and said first intermediate voltage terminal for operation at a second speed; means connected to said line terminals for producing a third voltage on a second intermediate voltage terminal; a first capacitor; a second stator winding being connected in series with said first capacitor to form a circuit branch which is connected to said line terminals; means for connecting said second stator winding between one of said line terminals and said second intermediate voltage terminal for operation at said second speed; a second capacitor which is connected in parallel with said first capacitor for operation at said second speed; and wherein said means for producing a second voltage and said means for producing a third voltage together comprise a single autotransformer with said first and second intermediate voltage terminals being tap points on said autotransformer.
Claim 5
Dependent Claim
210 words
An alternating current electric motor system comprising: a pair of line terminals for connection to an alternating current power source having a first voltage; means connected to said line terminals for producing a second voltage on a first intermediate voltage terminal; a first stator winding; means for connecting said first stator winding between said line terminals for operation at a first speed; means for connecting said first stator winding between one of said line terminals and said first intermediate voltage terminal for operation at a second speed; means connected to said line terminals for producing a third voltage on a second intermediate voltage terminal; a first capacitor; a second stator winding being connected in series with said first capacitor to form a circuit branch which is connected to said line terminals; means for connecting said second stator winding between one of said line terminals and said second intermediate voltage terminal for operation at said second speed; a second capacitor which is connected in parallel with said first capacitor for operation at said second speed; and wherein said means for producing a second voltage and said means for producing a third voltage together comprise a single autotransformer with said first and second intermediate voltage terminals being tap points on said autotransformer.
Claim 6
Dependent Claim
35 words
An alternating current electric motor system as recited in claim 3, wherein said first, second and third voltage levels are adjusted to achieve substantially balanced motor operation at both said first and said second speeds.
Claim 7
Dependent Claim
150 words
An alternating current electric motor system comprising: a pair of line terminals for connection to an alternating current power source having a first voltage; means connected to said line terminals for producing a second voltage on an intermediate voltage terminal; a first stator winding; means for connecting said first stator winding between said line terminals for operation at a first speed; means for connecting said first stator winding between one of said line terminals and said intermediate voltage terminal for operation at a second speed; a first capacitor; a second stator winding being connected in series with said first capacitor to form a circuit branch which is connected to said line terminals; a second capacitor; and means for connecting said second capacitor between said intermediate voltage terminal and a common connection between said first capacitor and said second stator winding in said circuit branch, for operation at said second speed.
Claim 8
Dependent Claim
150 words
An alternating current electric motor system comprising: a pair of line terminals for connection to an alternating current power source having a first voltage; means connected to said line terminals for producing a second voltage on an intermediate voltage terminal; a first stator winding; means for connecting said first stator winding between said line terminals for operation at a first speed; means for connecting said first stator winding between one of said line terminals and said intermediate voltage terminal for operation at a second speed; a first capacitor; a second stator winding being connected in series with said first capacitor to form a circuit branch which is connected to said line terminals; a second capacitor; and means for connecting said second capacitor between said intermediate voltage terminal and a common connection between said first capacitor and said second stator winding in said circuit branch, for operation at said second speed.
Claim 9
Dependent Claim
35 words
An alternating current electric motor system as recited in claim 5, wherein said means for producing a second voltage comprises: an autotransformer with said first intermediate voltage terminal being a tap point on said autotransformer.
Claim 10
Dependent Claim
33 words
An alternating current electric motor system as recited in claim 5, wherein said first and second voltage levels are adjusted to achieve substantially balanced motor operation at both said first and second speeds.
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) | 1987-08-14 | 1988-02-13 | 1988-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-08-14 | 1992-02-13 | 1992-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-08-14 | 1996-02-13 | 1996-08-14 | $7700.00 | Window Closed / Lapsed |