US6242883B1
Expired / Lapsed
US
⏱️ 0.0 years remaining
Variable speed three-phase motor drive with two inverter circuits
Assignee: Individual
•
Filing: 1998-02-23
•
Granted: 2001-06-05
•
Expires: 2018-02-23
Abstract
Abstract An apparatus and method for driving a three-phase motor from an AC energy source includes a converter connected between the energy source and an inverter. The inverter includes two inverter circuits controlled by a logic circuit. The outputs of the inverter circuits have a phase angle therebetween of 60 ° and are connected directly to two inputs of the motor. The remaining motor input can be connected to either the first or second line of the energy source. Both the frequency and the magnitude of the voltage waveforms can be varied to control the speed of the motor.
Inventors
- 👤 Timothy L. Strunk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 00:32
CPC Classifications
H; H02; H02M; H02M7/00; H02M7/42; H02M7/44; H02M7/48; H02M7/53; H02M7/537; H02M7/5387; H02M5/00; H02M5/40; H02M5/42; H02M5/44; H02M5/443; H02M5/45; H02P; H02P2209/00; H02P2209/05
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
136 words
A method of supplying variable-voltage-variable frequency three-phase electrical power from a single-phase power source to a three-phase electric motor by means of an inverter such that the magnitude and frequency of the voltage applied to said motor is any practical value and is not limited to that of said single-phase power source, said motor including three windings operatively connected to three input terminals, comprising the steps of: connecting a first individual input terminal of said motor to a reference input of said converter; and connecting second and third input terminals of said motor to first and second inverter circuits of said inverter which apply alternating voltage/current waveforms with a predetermined phase angle therebetween of substantially sixty degrees to said second and third input terminals of said motor to provide for variable speed control of said motor.
Claim 2
Independent Claim
136 words
A method of supplying variable-voltage-variable frequency three-phase electrical power from a single-phase power source to a three-phase electric motor by means of an inverter such that the magnitude and frequency of the voltage applied to said motor is any practical value and is not limited to that of said single-phase power source, said motor including three windings operatively connected to three input terminals, comprising the steps of: connecting a first individual input terminal of said motor to a reference input of said converter; and connecting second and third input terminals of said motor to first and second inverter circuits of said inverter which apply alternating voltage/current waveforms with a predetermined phase angle therebetween of substantially sixty degrees to said second and third input terminals of said motor to provide for variable speed control of said motor.
Claim 3
Dependent Claim
15 words
The method of claim 1 , wherein said alternating voltage/current waveforms have substantially identical amplitudes.
Claim 4
Dependent Claim
17 words
The method of claim 2 , wherein said alternating voltage/current waveforms have substantially a sine wave shape.
Claim 5
Dependent Claim
26 words
The method of claim 1 , wherein said first individual input terminal of said three-phase motor is connected to a second line of said power source.
Claim 6
Independent Claim
130 words
A method of supplying variable-voltage-variable frequency three-phase electrical power from a single-phase power source to a three-phase electric motor by means of an inverter, said motor including three windings operatively connected to three input terminals, comprising the steps of: connecting a first individual input terminal of said motor to a reference input of said converter; connecting second and third input terminals of said motor to first and second inverter circuits of said inverter such that a magnitude and frequency of a voltage applied to said motor is not limited to that of said single-phase power source; and applying alternating voltage/current waveforms with a predetermined phase angle therebetween of substantially sixty degrees to said second and third input terminals of said motor to provide for variable speed control of said motor.
Claim 7
Independent Claim
130 words
A method of supplying variable-voltage-variable frequency three-phase electrical power from a single-phase power source to a three-phase electric motor by means of an inverter, said motor including three windings operatively connected to three input terminals, comprising the steps of: connecting a first individual input terminal of said motor to a reference input of said converter; connecting second and third input terminals of said motor to first and second inverter circuits of said inverter such that a magnitude and frequency of a voltage applied to said motor is not limited to that of said single-phase power source; and applying alternating voltage/current waveforms with a predetermined phase angle therebetween of substantially sixty degrees to said second and third input terminals of said motor to provide for variable speed control of said motor.
Claim 8
Dependent Claim
15 words
The method of claim 5 , wherein said alternating voltage/current waveforms have substantially identical amplitudes.
Claim 9
Dependent Claim
17 words
The method of claim 6 , wherein said alternating voltage/current waveforms have substantially a sine wave shape.
Claim 10
Dependent Claim
26 words
The method of claim 5 , wherein said first individual input terminal of said three-phase motor is connected to a second line of said power source.
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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) | 2004-06-04 | 2004-12-04 | 2005-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2008-06-04 | 2008-12-04 | 2009-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2012-06-04 | 2012-12-04 | 2013-06-05 | $7700.00 | Window Closed / Lapsed |