US4221999A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Three-phase two speed A.C. motor
Assignee: AO Smith Corp
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Filing: 1978-03-29
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Granted: 1980-09-09
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Expires: 1998-03-29
Abstract
Abstract A three-phase motor is wound with three spaced phase windings each having first and second multiple section windings. The second winding sections of each are connected in series. The first winding has one end of all three phases connected in common. The second winding has one end connected to the common intermediate connection of the first winding sections. The outer ends of the windings are connected to a two-speed switch having two different positions for alternate direct connection of the two windings to incoming phase lines. In one position, both sections are in circuit with the three oppposite ends of the one winding connected to each other to form a second common connection. In second position, the second windings is disconnected and the first winding sections are connected in series in a star circuit, with the current flow in the two sections of each winding reversed from the first speed connection. The switch includes five separate switches, three of which have a common pole connected to a phase line and an associated high speed contact and low speed contact connected to the windings and two of which have interconnected common poles and associated contacts to the terminal ends of the second winding.
Inventors
- 👤 Elmer J. Gausman, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 16:13
CPC Classifications
H; H02; H02K; H02K17/00; H02K17/02; H02K17/12; H02K17/14; H02P; H02P25/00; H02P25/16; H02P25/18; H02P25/20
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
273 words
A three-phase motor having a plurality of preselected operating speeds, said motor having three-phase winding assemblies displaced by one-hundred and twenty degrees and a switch unit connecting three-phase input means to said winding assemblies, each of said three-phase winding assemblies comprising a first multiple section winding having a first winding section connected in series with a second winding section, said winding sections being offset to define a pair of poles, said first winding sections of said three-phase winding assemblies having the first ends connected in common, said second winding sections of said three-phase winding assemblies having the second ends connected to said switch unit, a second multiple section winding having a first winding section and a second winding section, said winding sections of said second winding being offset to define a pair of poles and connected to form poles of opposite polarity; the first end of said second winding connected to the common connection between the first and second winding sections of the first winding and the second end connected to said switch unit, said switch unit including a plurality of switches having one speed position selectively and directly connecting the three-phase input means to the second ends of the second windings and the second ends of the first windings to each other to provide a substantially unmodulated equal magnitude poles of a first predetermined number and a second speed position connecting said second ends of said first winding directly to the three-phase input means and open circuiting the connection to the second windings to provide a substantially unmodulated equal magnitude poles of a second predetermined number different than said first predetermined number.
Claim 2
Dependent Claim
273 words
A three-phase motor having a plurality of preselected operating speeds, said motor having three-phase winding assemblies displaced by one-hundred and twenty degrees and a switch unit connecting three-phase input means to said winding assemblies, each of said three-phase winding assemblies comprising a first multiple section winding having a first winding section connected in series with a second winding section, said winding sections being offset to define a pair of poles, said first winding sections of said three-phase winding assemblies having the first ends connected in common, said second winding sections of said three-phase winding assemblies having the second ends connected to said switch unit, a second multiple section winding having a first winding section and a second winding section, said winding sections of said second winding being offset to define a pair of poles and connected to form poles of opposite polarity; the first end of said second winding connected to the common connection between the first and second winding sections of the first winding and the second end connected to said switch unit, said switch unit including a plurality of switches having one speed position selectively and directly connecting the three-phase input means to the second ends of the second windings and the second ends of the first windings to each other to provide a substantially unmodulated equal magnitude poles of a first predetermined number and a second speed position connecting said second ends of said first winding directly to the three-phase input means and open circuiting the connection to the second windings to provide a substantially unmodulated equal magnitude poles of a second predetermined number different than said first predetermined number.
Claim 3
Dependent Claim
59 words
The three-phase motor of claim 1 wherein the first and second sections of said second winding are wound with coil sides spaced by essentially one-hundred and eighty degrees, and the first and second sections of the first winding each include a plurality of series connected coils concentrically wound within the respective first and second sections of said first winding.
Claim 4
Dependent Claim
107 words
The three-phase motor of claim 1 wherein said switch unit includes five switches having a common operator, the first, second and third of said switches being double pole, double throw switches having a high speed contact connected to the second end of the second winding and a low speed contact connected to the second end of the first winding, the fourth of said switches connected to the second ends of the second winding of a first and second of said winding assemblies, and the fifth of said switches connected to the second ends of the second winding of the first and a third of said winding assemblies.
Claim 5
Dependent Claim
211 words
A three-phase motor having a plurality of preselected operating speeds, comprising three-phase winding assemblies, each of said winding assemblies comprising a first and second multiple sectioned windings having a first winding section connected in series with a second winding section, a switch unit having three-phase input line connection means, said winding sections of each winding being correspondingly offset and concentrically wound to define pairs of poles, said assemblies having one end of the first windings connected in common and the second ends connected to said switch unit, said second winding having one end connected to a common connection between first and second winding sections of the first winding and the second end connected to said switch unit, said switch unit having one speed position selectively and directly connecting the three-phase input line connection means to the second ends of the second winding and the second ends of the first winding to each other to provide unmodulated substantially equal magnitude poles of a first predetermined number and a second speed position connecting said second ends of said first winding directly to the three-phase input means and open circuiting the connection to the second winding to provide unmodulated substantially equal magnitude poles of a second predetermined number different than said first predetermined number.
Claim 6
Dependent Claim
211 words
A three-phase motor having a plurality of preselected operating speeds, comprising three-phase winding assemblies, each of said winding assemblies comprising a first and second multiple sectioned windings having a first winding section connected in series with a second winding section, a switch unit having three-phase input line connection means, said winding sections of each winding being correspondingly offset and concentrically wound to define pairs of poles, said assemblies having one end of the first windings connected in common and the second ends connected to said switch unit, said second winding having one end connected to a common connection between first and second winding sections of the first winding and the second end connected to said switch unit, said switch unit having one speed position selectively and directly connecting the three-phase input line connection means to the second ends of the second winding and the second ends of the first winding to each other to provide unmodulated substantially equal magnitude poles of a first predetermined number and a second speed position connecting said second ends of said first winding directly to the three-phase input means and open circuiting the connection to the second winding to provide unmodulated substantially equal magnitude poles of a second predetermined number different than said first predetermined number.
Claim 7
Dependent Claim
55 words
The three-phase motor of claim 1 wherein the first and second sections of said second winding are wound including a coil with coil sides spaced by essentially one-hundred and eighty degrees, and the first and second sections of the first winding being concentrically wound within the respective first and second sections of said first winding.
Claim 8
Dependent Claim
81 words
The three-phase motor of claim 1 wherein said switch unit includes a low speed connection and a high speed connection and includes five switch sections, three sections having high speed contacts connected to the second end of the second winding and low speed contacts connected to the second end of the first winding, the fourth section having only a high speed contact connected to the second ends of the second winding to form a common connection in the high speed position.
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) | 1983-09-09 | 1984-03-10 | 1984-09-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-09-09 | 1988-03-10 | 1988-09-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-09-09 | 1992-03-10 | 1992-09-09 | $7700.00 | Window Closed / Lapsed |