US3821602A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermally protectable multispeed motor
Assignee: General Electric Co
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Filing: 1972-11-20
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Granted: 1974-06-28
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Expires: 1992-11-20
Abstract
Abstract Multispeed single phase induction motor has plural main winding sections and an auxiliary winding arranged in distributed coil groups on a slotted magnetizable core. Single thermal protector connected in series with all of main winding sections; one end of auxiliary winding connected with thermal protector and high speed main winding section. Conductor extends from the other end of auxiliary winding to a point accessible from motor exterior. Other conductors extend to be accessible from motor exterior for selective connection to power source. The polar axis of each auxiliary coil group is displaced a predetermined angle B (measured in electrical degrees) from a next adjacent main winding coil group polar axis. Motors embodying invention have improved low speed starting torque; less output torque pulsation; less heat loss; less power input requirements; better efficiency; and that require less operating current for any given speed - all while using less winding conductor than heretofore. In some designs, smaller capacitor for the auxiliary winding can be used than heretofore in motors optimized for same given application.
Inventors
- 👤 C Linkous
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:28
CPC Classifications
H; H02; H02K; H02K17/00; H02K17/02; H02K17/04; H02K17/08; H02K11/00; H02K11/20; H02K11/25; H02K3/00; H02K3/04; H02K3/28
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
153 words
A multispeed single phase induction motor having a magnetizable core having winding accommodating regions, a plurality of main winding sections connected together in series relation, at least one auxiliary winding section connected at a first side thereof to a first side of one of the main winding sections, a thermal protector connected to the first side of the auxiliary winding section, and circuit means connecting the thermal protector in series with said at least one auxiliary winding section and all of said main winding sections; said main winding sections being arranged on the magnetizable core to establish a set of at least two main winding polar axes and said at least one auxiliary winding section being arranged on the magnetizable core to establish a set of at least two auxiliary winding polar axes each displaced a predetermined angle in excess of 90 electrical degrees from a main winding polar axis next adjacent thereto.
Claim 2
Dependent Claim
153 words
A multispeed single phase induction motor having a magnetizable core having winding accommodating regions, a plurality of main winding sections connected together in series relation, at least one auxiliary winding section connected at a first side thereof to a first side of one of the main winding sections, a thermal protector connected to the first side of the auxiliary winding section, and circuit means connecting the thermal protector in series with said at least one auxiliary winding section and all of said main winding sections; said main winding sections being arranged on the magnetizable core to establish a set of at least two main winding polar axes and said at least one auxiliary winding section being arranged on the magnetizable core to establish a set of at least two auxiliary winding polar axes each displaced a predetermined angle in excess of 90 electrical degrees from a main winding polar axis next adjacent thereto.
Claim 3
Dependent Claim
34 words
The motor of claim 1 wherein the main and auxiliary winding sections each comprise at least one coil group comprising a plurality of winding turns distributed along the winding accommodating regions of the core.
Claim 4
Dependent Claim
39 words
The motor of claim 1 further including a conductor extending from a second side of the auxiliary winding section to a point accessible from outside the motor and adapted to be connected through a capacitor to a power source.
Claim 5
Dependent Claim
211 words
A multispeed induction motor having a stator assembly and rotor assembly; said stator assembly comprising: a magnetizable core; a main winding including a plurality of main winding sections; an auxiliary winding; and circuit means permitting the connection of a thermal protector in series circuit relation with the auxiliary winding and each of the main winding sections and a series circuit relationship of all of said main winding sections; said auxiliary winding being positioned on the core to establish at least one auxiliary polar axis and having first and second auxiliary winding ends, with the first auxiliary winding end being connected to a first end of a first main winding section and the second auxiliary winding end connected to a conductor extending to a point accessible from outside the motor and adapted to be connected to one side of a capacitor; said main winding being positioned on the core to establish at least one main winding polar axis adjacent to the at least one auxiliary winding polar axis and spaced therefrom more than 90 electrical degrees, said main winding having the second end of the first main winding section connected to a conductor extending to a point accessible from outside the motor and adapted to be connected to a source of power.
Claim 6
Dependent Claim
211 words
A multispeed induction motor having a stator assembly and rotor assembly; said stator assembly comprising: a magnetizable core; a main winding including a plurality of main winding sections; an auxiliary winding; and circuit means permitting the connection of a thermal protector in series circuit relation with the auxiliary winding and each of the main winding sections and a series circuit relationship of all of said main winding sections; said auxiliary winding being positioned on the core to establish at least one auxiliary polar axis and having first and second auxiliary winding ends, with the first auxiliary winding end being connected to a first end of a first main winding section and the second auxiliary winding end connected to a conductor extending to a point accessible from outside the motor and adapted to be connected to one side of a capacitor; said main winding being positioned on the core to establish at least one main winding polar axis adjacent to the at least one auxiliary winding polar axis and spaced therefrom more than 90 electrical degrees, said main winding having the second end of the first main winding section connected to a conductor extending to a point accessible from outside the motor and adapted to be connected to a source of power.
Claim 7
Dependent Claim
69 words
The motor of claim 4 further including at least first and second leads connected to the first and second ends of a second main winding section and extending to a point accessible outside the motor and adapted to be selectively connected to a power source; and wherein the thermal protector is disposed within the motor and connected between the first main winding section and the second main winding section.
Claim 8
Dependent Claim
17 words
The motor of claim 5 wherein the auxiliary winding and main winding sections comprise distributed winding turns.
Claim 9
Dependent Claim
135 words
A multispeed induction motor having a magnetizable core with a plurality of slots therein, a main winding including an extended main winding section arranged in distributed coil groups on the core, an auxiliary winding arranged in distributed coil groups on the core and having a first side thereof connected to the main winding between the ends thereof, and a single thermal protector connected in series with the auxiliary and main windings; said main winding coil groups being positioned on the core to establish at least two main winding radial polar axes, and said auxiliary winding coil groups being positioned on the core to establish an auxiliary winding radial polar axis adjacent to one of the at least two main winding radial polar axes and spaced therefrom an arcuate distance in excess of 90 electrical degrees.
Claim 10
Dependent Claim
135 words
A multispeed induction motor having a magnetizable core with a plurality of slots therein, a main winding including an extended main winding section arranged in distributed coil groups on the core, an auxiliary winding arranged in distributed coil groups on the core and having a first side thereof connected to the main winding between the ends thereof, and a single thermal protector connected in series with the auxiliary and main windings; said main winding coil groups being positioned on the core to establish at least two main winding radial polar axes, and said auxiliary winding coil groups being positioned on the core to establish an auxiliary winding radial polar axis adjacent to one of the at least two main winding radial polar axes and spaced therefrom an arcuate distance in excess of 90 electrical degrees.
Claim 11
Dependent Claim
51 words
The motor of claim 7 wherein the auxiliary winding is connected at the second side thereof to a conductor extending to a point accessible from the exterior of the motor, and the single thermal protector is connected between the extended main winding section and the first side of the auxiliary winding.
Claim 12
Dependent Claim
110 words
In a multispeed induction motor having a magnetizable core, a distributed wound main winding, including an extended main winding section, placed on the core and defining at least two main winding polar axes, and at least three conductors extending to a point accessible from the exterior of the motor; the improvement comprising: a distributed wound auxiliary winding placed on the core and positioned relative to the main winding to establish at least two auxiliary winding polar axes each displaced more than 90 electrical degrees from the main winding polar axis next adjacent thereto, a first end of said auxiliary winding being connected to one of said at least three conductors.
Claim 13
Dependent Claim
110 words
In a multispeed induction motor having a magnetizable core, a distributed wound main winding, including an extended main winding section, placed on the core and defining at least two main winding polar axes, and at least three conductors extending to a point accessible from the exterior of the motor; the improvement comprising: a distributed wound auxiliary winding placed on the core and positioned relative to the main winding to establish at least two auxiliary winding polar axes each displaced more than 90 electrical degrees from the main winding polar axis next adjacent thereto, a first end of said auxiliary winding being connected to one of said at least three conductors.
Claim 14
Dependent Claim
45 words
The invention set forth in claim 9 wherein a second end of said auxiliary winding is connected to the main winding between the ends thereof, and said motor further comprises a thermal protector connected in series with both the auxiliary winding and the main winding.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-27 | 1977-12-27 | 1978-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-27 | 1981-12-27 | 1982-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-27 | 1985-12-27 | 1986-06-28 | $7700.00 | Window Closed / Lapsed |