US4675565A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Capacitor-start parallel resonant motor
Assignee: LEWUS ALEXANDER J REVOCABLE INTER VIVOS LIVING TRUST
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Filing: 1986-06-02
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Granted: 1987-06-23
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Expires: 2006-06-02
Abstract
Abstract An electric current motor is operated from a single phase of alternating current power source, and functions with low surge operation at motor start. The motor includes first and second windings of substantially the same wire size angularly displaced from one another 90° electrical on a stator core and inductively coupled to a rotor. A capacitor is connected in parallel with one of the windings to form an LC resonant circuit at the operating frequency of the motor. A second starting capacitor is connected in series with a switch in parallel with the first capacitor. The switch is normally closed during starting of the motor and is opened during normal load conditions.
Inventors
- 👤 Alexander J. Lewus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:32
CPC Classifications
H; H02; H02K; H02K17/00; H02K17/02; H02K17/04; H02K17/08; H02K99/00; H02K99/20; H02P; H02P1/00; H02P1/16; H02P1/42; H02P1/44
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
180 words
An alternating current motor for operation from a source of single phase alternating current power and having first and second windings electrically angularly displaced from one another substantially 90° on a stator core and inductively coupled to a rotor, said motor including in combination: means for connecting said first and second windings in electrical series circuit with one another; means for applying single phase alternating current power to said series-connected first and second windings throughout the starting and running operation of said motor; first capacitor means connected in parallel with said first winding to form an LC resonant circuit therewith at the frequency of alternating current power applied by said means for applying alternating current power; second capacitor means; switch means connected in series with said second capacitor means; means for connecting said series-connected switch means and second capacitor means in parallel with said first capacitor means; and means coupled with said switching means for causing said switch means to be closed during starting of said motor and to be opened during normal load conditions of operation of said motor.
Claim 2
Dependent Claim
180 words
An alternating current motor for operation from a source of single phase alternating current power and having first and second windings electrically angularly displaced from one another substantially 90° on a stator core and inductively coupled to a rotor, said motor including in combination: means for connecting said first and second windings in electrical series circuit with one another; means for applying single phase alternating current power to said series-connected first and second windings throughout the starting and running operation of said motor; first capacitor means connected in parallel with said first winding to form an LC resonant circuit therewith at the frequency of alternating current power applied by said means for applying alternating current power; second capacitor means; switch means connected in series with said second capacitor means; means for connecting said series-connected switch means and second capacitor means in parallel with said first capacitor means; and means coupled with said switching means for causing said switch means to be closed during starting of said motor and to be opened during normal load conditions of operation of said motor.
Claim 3
Dependent Claim
25 words
The combination according to claim 1 wherein the capacitance of said second capacitor means is substantially greater than the capacitance of said first capacitor means.
Claim 4
Dependent Claim
21 words
The combination according to claim 2 wherein said first and second windings are wound with wire of substantially the same size.
Claim 5
Dependent Claim
39 words
The combination according to claim 3 wherein the parameters of said first and second windings, said stator core, and said first capacitor means are selected to cause said stator core to be operated at a flux density near saturation.
Claim 6
Dependent Claim
50 words
The combination according to claim 3 wherein said switch means is a normally closed centrifugal switch coupled with the rotor of said motor ; so that upon attainment of a predetermined rotational speed of said rotor, said switch means is opened to disconnect said second capacitor means from the circuit.
Claim 7
Dependent Claim
111 words
The combination according to claim 3 wherein said switch means comprises a AC bi-directional semiconductor switch having first and second electrodes operatively connected in series circuit with said second capacitor means, and having a gate electrode for triggering said switch between a conductive state and a non-conductive state, said semiconductor switch including a current-sensitive control device connected in series with said first winding and said means for applying alternating current power, and further bias-variable impedance means coupled with said current sensitive control device and said gate electrode for triggering said semiconductor switch from a conductive during motor starting to a non-conductive state during normal load conditions of operation of said motor.
Claim 8
Dependent Claim
21 words
The combination according to claim 1 wherein said first and second windings are wound with wire of substantially the same size.
Claim 9
Dependent Claim
39 words
The combination according to claim 1 wherein the parameters of said first and second windings, said stator core, and said first capacitor means are selected to cause said stator core to be operated at a flux density near saturation.
Claim 10
Dependent Claim
38 words
The combination according to claim 1 wherein said first winding comprises a plurality of first windings connected in series with one another and wherein said first capacitor means is connected in parallel with said plurality of first windings.
Claim 11
Dependent Claim
28 words
The combination according to claim 1 wherein said first winding has a center tap and said second winding is connected to said center tap on said first winding.
Claim 12
Dependent Claim
25 words
The combination according to claim 10 wherein the capacitance of said second capacitor means is substantially greater than the capacitance of said first capacitor means.
Claim 13
Dependent Claim
50 words
The combination according to claim 1 wherein said switch means is a normally closed centrifugal switch coupled with the rotor of said motor ; so that upon attainment of a predetermined rotational speed of said rotor, said switch means is opened to disconnect said second capacitor means from the circuit.
Claim 14
Dependent Claim
25 words
The combination according to claim 12 wherein the capacitance of said second capacitor means is substantially greater than the capacitance of said first capacitor means.
Claim 15
Dependent Claim
111 words
The combination according to claim 1 wherein said switch means comprises a AC bi-directional semiconductor switch having first and second electrodes operatively connected in series circuit with said second capacitor means, and having a gate electrode for triggering said switch between a conductive state and a non-conductive state, said semiconductor switch including a current-sensitive control device connected in series with said first winding and said means for applying alternating current power, and further bias-variable impedance means coupled with said current sensitive control device and said gate electrode for triggering said semiconductor switch from a conductive during motor starting to a non-conductive state during normal load conditions of operation of said motor.
Claim 16
Dependent Claim
25 words
The combination according to claim 14 wherein the capacitance of said second capacitor means is substantially greater than the capacitance of said first capacitor means.
Claim 17
Dependent Claim
77 words
The combination according to claim 1 wherein said means for causing said switch means to be closed and opened includes a power relay coupled to said means for applying single phase alternating current power for operation thereby , said relay including contacts connected in series circuit with each of said first and second capacitor means, said power relay causing said contacts to be closed whenever said alternating current power is applied to said first and second windings.
Claim 18
Dependent Claim
54 words
The combination according to claim 1 further including a voltage sensitive relay connected is parallel with said second winding for operating said switch means, wherein said voltage sensitive relay causes said switch means to be closed during starting of said motor and to be opened during normal load conditions of operations of said motor.
Claim 19
Dependent Claim
175 words
An alternating current motor for operation from a source of single phase alternating current power and having first and second windings electrically angularly displaced from one another substantially 90° in a stator core and inductively coupled to a rotor, said motor including in combination: means for connecting said first and second windings in electrical series circuit with one another; means for applying single phase alternating current power to said series-connected first and second windings throughout the starting and running operation of said motor; capacitor means; switch means connected in series with said capacitor means; means for connecting said series-connected switch means and capacitor means in parallel with said first winding to form an LC resonant circuit therewith at the frequency of alternating current power applied by said means for applying alternating current power; and means coupled with said switch means and responsive to the operating condition of said motor for causing said switch means to be closed during starting of said motor and to be opened during normal load conditions of operation of said motor.
Claim 20
Dependent Claim
175 words
An alternating current motor for operation from a source of single phase alternating current power and having first and second windings electrically angularly displaced from one another substantially 90° in a stator core and inductively coupled to a rotor, said motor including in combination: means for connecting said first and second windings in electrical series circuit with one another; means for applying single phase alternating current power to said series-connected first and second windings throughout the starting and running operation of said motor; capacitor means; switch means connected in series with said capacitor means; means for connecting said series-connected switch means and capacitor means in parallel with said first winding to form an LC resonant circuit therewith at the frequency of alternating current power applied by said means for applying alternating current power; and means coupled with said switch means and responsive to the operating condition of said motor for causing said switch means to be closed during starting of said motor and to be opened during normal load conditions of operation of said motor.
Claim 21
Dependent Claim
17 words
The combination according to claim 18 wherein said capacitor means is an electrolytic non-polarized alternating current capacitor.
Claim 22
Dependent Claim
20 words
The combination according to claim 18, wherein said first winding has a greater number of turns than said second winding.
Claim 23
Dependent Claim
19 words
The combination according to claim 18 wherein said second winding has approximately one-fourth the turns of said first winding.
Claim 24
Dependent Claim
19 words
The combination according to claim 18 wherein the wire size for said first and second windings is substantially equal.
Claim 25
Dependent Claim
38 words
The combination according to claim 18 wherein the parameters of said first and second windings are selected to cause the stator magnetic flux density to be substantially at saturation during normal load conditions of operation of said motor.
Claim 26
Dependent Claim
15 words
The combination according to claim 1 wherein said second capacitor means is an electrolytic capacitor.
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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) | 1990-06-22 | 1990-12-22 | 1991-06-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-06-22 | 1994-12-22 | 1995-06-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-06-22 | 1998-12-22 | 1999-06-23 | $7700.00 | Window Closed / Lapsed |