US3809976A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for synchronizing a three phase motor
Assignee: H et JJ Bessire SA
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Filing: 1972-04-20
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Granted: 1974-05-07
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Expires: 1992-04-20
Abstract
Abstract The method and apparatus for synchronizing a three phase motor with a master motor or other device includes generating three phase voltage pulses which are controlled in frequency by the speed of rotation of the master motor and which vary in amplitude as a function of speed variations of said master motor. A pulse generator driven by the master motor provides pulses which are controlled in frequency by the speed of the master motor and directs such pulses as three phase voltage pulses to three commutating units which selectively feed a winding of a three phase motor. Each commutating unit receives voltage pulses of one phase, and upon receipt of such pulses, provides a signal to the associated motor winding. The amplitude of this signal is controlled as a function of an integrated signal derived from integrating pulses from the pulse generator.
Inventors
- 👤 J Bessire
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 11:11
CPC Classifications
H; H02; H02P; H02P6/00; H02P6/08; H02P25/00; H02P25/02; H02P25/022; H02P25/024; H02P5/00; H02P5/46; H02P5/50; H02P5/51
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
181 words
A method for synchronizing a three phase synchronous motor having at least one stator winding for each phase with the speed of a master motor which includes sensing said master motor speed, generating a train of timing pulses for the stator windings of each phase of said synchronous motor which form a three phase group of pulses controlled in frequency by the speed of rotation of said master motor, generating a train of control pulses having a frequency which is a function of the speed of rotation of said master motor, using said control pulses to provide a D.C. power signal having an amplitude which is a function of the frequency of said train of control pulses, and feeding the D.C. power signal to the stator windings for each phase of said synchronous motor in accordance with the respective timing pulse train for said phase to provide three driving pulses for each said stator winding for each rotation of said master motor having the amplitude of said D.C. power signal and the frequency and phase of the respective timing pulse train.
Claim 2
Independent Claim
181 words
A method for synchronizing a three phase synchronous motor having at least one stator winding for each phase with the speed of a master motor which includes sensing said master motor speed, generating a train of timing pulses for the stator windings of each phase of said synchronous motor which form a three phase group of pulses controlled in frequency by the speed of rotation of said master motor, generating a train of control pulses having a frequency which is a function of the speed of rotation of said master motor, using said control pulses to provide a D.C. power signal having an amplitude which is a function of the frequency of said train of control pulses, and feeding the D.C. power signal to the stator windings for each phase of said synchronous motor in accordance with the respective timing pulse train for said phase to provide three driving pulses for each said stator winding for each rotation of said master motor having the amplitude of said D.C. power signal and the frequency and phase of the respective timing pulse train.
Claim 3
Dependent Claim
109 words
The method according to claim 1 which includes energizing six different stator winding combinations with said driving pulses during each cycle of rotation of said master motor during six separate 60* segments of the rotating cycle of said master motor by providing a driving pulse to a first stator winding; subsequently providing simultaneous driving pulses to the first and a second stator winding; subsequently providing a driving pulse to said second stator winding; subsequently providing simultaneous driving pulses to the second and a third stator winding; subsequently providing a driving pulse to the third stator winding; and subsequently providing simultaneous driving pulses to the first and third stator windings.
Claim 4
Dependent Claim
264 words
A motor synchronization system operative in response to a master rotating device comprising a three phase synchronous electric motor having star connected stator winding means, said stator winding means including at least one stator winding for each motor phase, switching means connected to supply a power signal to said stator winding means upon receipt of an activating pulse, said switching means including a first pulse operated switch unit connected to a first stator winding, a second pulse operated switch unit connected to a second stator winding and a third pulse operated switch unit connected to a third stator winding, power supply means connected to provide said power signal to said pulse operated switch units, pulse generator means operative to generate three phase output pulses which are controlled in frequency by the speed of rotation of said master rotating device and which vary in frequency in direct relation to variations in the speed of rotation of said master rotating device and to provide output pulses of each phase as activating pulses to a different one of said pulse operated switch units to cause the switch unit upon receipt of said activating pulse to supply said power signal to the stator winding connected thereto, said pulse generator means operating to provide six different activating pulse combinations to said switch units during each cycle of rotation of said master rotating device, and integrator control means connected to receive output pulses from said pulse generator means and to control the amplitude of said power signal as a function of variations in the speed of said master rotating device.
Claim 5
Dependent Claim
264 words
A motor synchronization system operative in response to a master rotating device comprising a three phase synchronous electric motor having star connected stator winding means, said stator winding means including at least one stator winding for each motor phase, switching means connected to supply a power signal to said stator winding means upon receipt of an activating pulse, said switching means including a first pulse operated switch unit connected to a first stator winding, a second pulse operated switch unit connected to a second stator winding and a third pulse operated switch unit connected to a third stator winding, power supply means connected to provide said power signal to said pulse operated switch units, pulse generator means operative to generate three phase output pulses which are controlled in frequency by the speed of rotation of said master rotating device and which vary in frequency in direct relation to variations in the speed of rotation of said master rotating device and to provide output pulses of each phase as activating pulses to a different one of said pulse operated switch units to cause the switch unit upon receipt of said activating pulse to supply said power signal to the stator winding connected thereto, said pulse generator means operating to provide six different activating pulse combinations to said switch units during each cycle of rotation of said master rotating device, and integrator control means connected to receive output pulses from said pulse generator means and to control the amplitude of said power signal as a function of variations in the speed of said master rotating device.
Claim 6
Dependent Claim
30 words
The motor synchronization system of claim 3 wherein said pulse generator means provides three activating pulses to each switch unit during each cycle of rotation of said master rotating device.
Claim 7
Dependent Claim
85 words
The master synchronization system of claim 4 wherein said pulse generator means operates during six separate 60* segments of the rotating cycle of said master rotating device to provide respectively; an activating pulse to said first switch unit; simultaneous activating pulses to said first and second switch units; an activating pulse to said second switch unit; simultaneous activating pulses to said second and third switch units; an activating pulse to said third switch unit; and simultaneous activating pulses to said first and third switch units.
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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) | 1977-05-06 | 1977-11-05 | 1978-05-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-06 | 1981-11-05 | 1982-05-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-06 | 1985-11-05 | 1986-05-07 | $7700.00 | Window Closed / Lapsed |