Patent US3628971A successfully refreshed from Google Patents.
Patent US4361791A successfully refreshed from Google Patents.
US4361791A
Expired / Lapsed
US
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Apparatus for controlling a PWM inverter-permanent magnet synchronous motor drive
Assignee: General Electric Co
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Filing: 1981-05-12
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Granted: 1982-11-30
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Expires: 2001-05-12
Abstract
Abstract Apparatus for controlling a permanent magnet AC synchronous motor supplied by a forced commutated inverter that does not use a mechanical shaft position sensor. A control loop regulates an inverter frequency and maintains inverter synchronism with the motor using electrical angle feedback signals developed from measured flux signals that have been phase shifted.
Inventors
- 👤 Allan B. Plunkett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:54
CPC Classifications
H; H02; H02P; H02P25/00; H02P25/02; H02P25/022; H02P25/024
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
119 words
A control system for regulating a frequency command to an alternating power source supplying a permanent magnet motor comprising: means for measuring the motor flux phasor; means for rotating said motor flux phasor through a predetermined electrical angle; means for generating an angle feedback signal dependent on the angle difference between the rotated flux phasor and the stator current phasor, said angle feedback signal varying monotonically during motor operation in the lagging and leading power factor mode; means for generating an angle command dependent on the difference between an operator commanded torque and actual machine torque; and means for comparing said commanded angle signal to said angle feedback signal for generating a frequency command for said alternating power source.
Claim 2
Dependent Claim
119 words
A control system for regulating a frequency command to an alternating power source supplying a permanent magnet motor comprising: means for measuring the motor flux phasor; means for rotating said motor flux phasor through a predetermined electrical angle; means for generating an angle feedback signal dependent on the angle difference between the rotated flux phasor and the stator current phasor, said angle feedback signal varying monotonically during motor operation in the lagging and leading power factor mode; means for generating an angle command dependent on the difference between an operator commanded torque and actual machine torque; and means for comparing said commanded angle signal to said angle feedback signal for generating a frequency command for said alternating power source.
Claim 3
Dependent Claim
30 words
The control system of claim 1 wherein said angle feedback signal is dependent on the sine of the angle difference between the rotated flux phasor and the stator current phasor.
Claim 4
Dependent Claim
49 words
The control system of claim 1 wherein said means for rotating the motor flux through a predetermined electrical angle comprises means for transforming the air gap flux from each phase of said motor into equivalent two phase variables and rotating said two phase variables through a predetermined electrical angle.
Claim 5
Dependent Claim
210 words
A permanent magnet synchronous motor drive system comprising: a current controlled pulse width modulated inverter; a plurality of current regulators one for each motor phase; a multiphase waveform generator requiring a frequency command and a current magnitude command and supplying a reference waveform to each of said current regulators; said current regulators comparing actual motor phase current to a corresponding reference waveform and controlling the switching of a corresponding inverter phase so that the actual current profile of the current supplied to the motor remains confined within a predetermined deadband; control loop means for regulating said inverter frequency having means for measuring the motor flux phasor, means for rotating said motor flux phasor through a predetermined electrical angle, means for generating an angle feedback signal dependent on the angle difference between the rotated flux phasor and the stator current phasor, said angle feedback signal varying monotonically during motor operation in the lagging and leading power factor mode, means for generating an angle command dependent on the difference between operator commanded torque, means for comparing said commanded angle signal to said angle feedback signal for generating a frequency command for said waveform generator and means for generating a current magnitude command in response to said torque command to said waveform generator.
Claim 6
Dependent Claim
210 words
A permanent magnet synchronous motor drive system comprising: a current controlled pulse width modulated inverter; a plurality of current regulators one for each motor phase; a multiphase waveform generator requiring a frequency command and a current magnitude command and supplying a reference waveform to each of said current regulators; said current regulators comparing actual motor phase current to a corresponding reference waveform and controlling the switching of a corresponding inverter phase so that the actual current profile of the current supplied to the motor remains confined within a predetermined deadband; control loop means for regulating said inverter frequency having means for measuring the motor flux phasor, means for rotating said motor flux phasor through a predetermined electrical angle, means for generating an angle feedback signal dependent on the angle difference between the rotated flux phasor and the stator current phasor, said angle feedback signal varying monotonically during motor operation in the lagging and leading power factor mode, means for generating an angle command dependent on the difference between operator commanded torque, means for comparing said commanded angle signal to said angle feedback signal for generating a frequency command for said waveform generator and means for generating a current magnitude command in response to said torque command to said waveform generator.
Claim 7
Dependent Claim
30 words
The drive system of claim 4 wherein said angle feedback signal is dependent on the sine of the angle difference between the rotated flux phasor and the stator current phasor.
Claim 8
Dependent Claim
49 words
The drive system of claim 4 wherein said means for rotating the motor flux through a predetermined electrical angle comprises means for transforming the air gap flux from each phase of said motor into equivalent two phase variables and rotating said two phase variables through a predetermined electrical angle.
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) | 1985-11-29 | 1986-05-31 | 1986-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-11-29 | 1990-05-31 | 1990-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-11-29 | 1994-05-31 | 1994-11-30 | $7700.00 | Window Closed / Lapsed |