US4484125A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Three-phase delta-wound motor operated from single-phase current
Assignee: RONK ELECTRICAL IND Inc
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Filing: 1980-12-29
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Granted: 1984-11-20
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Expires: 2000-12-29
Abstract
Abstract A three-phase delta-wound motor adapted for operation from a source of single-phase current, which motor includes first and second terminals adapted to be connected to the single-phase current source and substantially identical first, second, and third phase windings. A capacitor and the first and second phase windings are series-connected one with the other across the first and second terminals, the polarity of the first winding with respect to the second winding being opposite that of a normal delta-wound motor. The third phase winding is connected directly across the first and second terminals in parallel with the serially-connected capacitor and first and second phase windings.
Inventors
- 👤 Claude M. Hertz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 02:22
CPC Classifications
H; H02; H02P; H02P1/00; H02P1/16; H02P1/26
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
121 words
A three-phase delta-wound motor adapted for operation from a source of single-phase current comprising first and second terminals adapted to be connected to said source, substantially identical first, second and third phase windings, and a capacitor, said capacitor and said first and second phase windings being series-connected one with the other, the polarity of the first winding at the point of connection with the second winding being the same as the polarity of the second winding at that point, said capacitor and first and second phase windings being series-connected across the first and second terminals, said third phase winding being connected directly across the first and second terminals in parallel with the serially-connected capacitor and the first and second phase windings.
Claim 2
Dependent Claim
121 words
A three-phase delta-wound motor adapted for operation from a source of single-phase current comprising first and second terminals adapted to be connected to said source, substantially identical first, second and third phase windings, and a capacitor, said capacitor and said first and second phase windings being series-connected one with the other, the polarity of the first winding at the point of connection with the second winding being the same as the polarity of the second winding at that point, said capacitor and first and second phase windings being series-connected across the first and second terminals, said third phase winding being connected directly across the first and second terminals in parallel with the serially-connected capacitor and the first and second phase windings.
Claim 3
Dependent Claim
111 words
A motor as set forth in claim 1 wherein the third phase winding includes a first winding section and a second winding section, further including a normally closed set of contacts connected between the first and second winding sections of the third phase winding thereby normally connecting said winding sections in series one with the other, one end of said first winding section of the third phase winding being connected to the first terminal and the opposite end of the second winding section of the third phase winding being connected to the second terminal thereby normally connecting said first and second winding sections in series across the first and second terminals.
Claim 4
Dependent Claim
157 words
A motor as set forth in claim 2 including two sets of normally open contacts, one of the normally open sets of contacts being connected between one end of the first winding section of the third phase winding and the corresponding end of the second winding section of the third phase winding and the other normally open set of contacts being connected between the opposite end of said first winding section and the corresponding end of said second winding section, said motor further including means for opening said normally closed set of contacts and for closing said normally open sets of contacts when the motor reaches a predetermined speed, whereby when said predetermined speed is reached the normally open sets of contacts are closed and the normally closed set of contacts is opened, thereby connecting the first and second winding sections of the third phase winding in parallel with each other across the first and second terminals.
Claim 5
Dependent Claim
67 words
A motor as set forth in claim 3 wherein each phase winding comprises first and second winding sections, the first and second winding sections of the first phase winding being connected in parallel with each other to form said first phase winding and the first and second winding sections of the second phase winding being connected in parallel with each other to form said second phase winding.
Claim 6
Dependent Claim
37 words
A motor as set forth in claim 3 wherein said opening and closing means is a relay and wherein the normally closed set of contacts and the normally open sets of contacts are contacts of said relay.
Claim 7
Dependent Claim
52 words
A motor as set forth in claim 1 wherein the first and second phase windings are directly connected in series one with the other, the capacitor is directly connected in series between the first terminal and the first phase winding, and the second phase winding is directly connected to the second terminal.
Claim 8
Dependent Claim
43 words
A motor as set forth in claim 1 wherein the first phase winding is directly connected to the first terminal, the second phase winding is directly connected to the second terminal and the capacitor is connected between the first and second phase windings.
Claim 9
Independent Claim
125 words
A method of converting a three-phase delta-wound motor for operation from a source of single-phase current, said motor having substantially identical first, second and third phase windings and having first and second terminals to be connected to said source, comprising the steps of: connecting the first and second phase windings in series one with the other, the polarity of the first winding at the point of connection with the second winding being the same as the polarity of the second winding at that point; serially connecting a capacitor and said first and second phase windings across said first and second terminals; and connecting the third phase winding across said first and second terminals in parallel with the serially-connected capacitor and first and second phase windings.
Claim 10
Independent Claim
125 words
A method of converting a three-phase delta-wound motor for operation from a source of single-phase current, said motor having substantially identical first, second and third phase windings and having first and second terminals to be connected to said source, comprising the steps of: connecting the first and second phase windings in series one with the other, the polarity of the first winding at the point of connection with the second winding being the same as the polarity of the second winding at that point; serially connecting a capacitor and said first and second phase windings across said first and second terminals; and connecting the third phase winding across said first and second terminals in parallel with the serially-connected capacitor and first and second phase windings.
Claim 11
Independent Claim
190 words
A method of converting a three-phase delta-wound motor for operation from a source of single-phase current, said motor having first and second terminals and having substantially identical first, second and third phase windings, each of said phase windings having first and second, winding sections, comprising the steps of: connecting the first and second phase windings in series one with the other, the polarity of the first winding at the point of connection with the second winding being the same as the polarity of the second winding at that point; serially connecting a capacitor and said first and second phase windings across the first and second terminals; connecting the first and second winding sections of the third phase winding in series one with the other for starting of the motor; connecting one end of the first winding section of the third phase winding to the first terminal; connecting the opposite end of the second winding section of the third phase winding to the second terminal; and reconnecting the first and second winding sections of the third phase winding in parallel one with the other after the motor reaches a predetermined speed.
Claim 12
Independent Claim
190 words
A method of converting a three-phase delta-wound motor for operation from a source of single-phase current, said motor having first and second terminals and having substantially identical first, second and third phase windings, each of said phase windings having first and second, winding sections, comprising the steps of: connecting the first and second phase windings in series one with the other, the polarity of the first winding at the point of connection with the second winding being the same as the polarity of the second winding at that point; serially connecting a capacitor and said first and second phase windings across the first and second terminals; connecting the first and second winding sections of the third phase winding in series one with the other for starting of the motor; connecting one end of the first winding section of the third phase winding to the first terminal; connecting the opposite end of the second winding section of the third phase winding to the second terminal; and reconnecting the first and second winding sections of the third phase winding in parallel one with the other after the motor reaches a predetermined speed.
Claim 13
Dependent Claim
149 words
A method as set forth in claim 9 including the further steps of connecting a normally closed set of contacts between the first and second winding sections of the third phase winding to normally connect said winding sections in series one with the other, and connecting two sets of normally open contacts between the first and second winding sections of the third phase winding, one of the normally open sets being connected between one end of said first winding section and the corresponding end of said second winding section, the other of the normally open sets of contacts being connected between the opposite end of said first winding section and the corresponding end of said second winding section to connect said first and second winding sections in parallel with each other when said sets of normally open contacts are closed and said normally closed set of contacts is open.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-11-20 | 1988-05-21 | 1988-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-11-20 | 1992-05-21 | 1992-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-11-20 | 1996-05-21 | 1996-11-20 | $7700.00 | Window Closed / Lapsed |