Patent US3893619A successfully refreshed from Google Patents.
Patent US3863120A successfully refreshed from Google Patents.
US3863120A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Means for controlling the output condition of a synchronous reluctance motor
Assignee: Western Atlas Inc
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Filing: 1973-03-02
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Granted: 1975-01-28
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Expires: 1993-03-02
Abstract
Abstract A means for controlling the output torque condition of a synchronous reluctance motor. The means comprises a motor control having a first signal means generating a torque command signal and a second signal means providing a rotor frequency signal. A stator winding energization means is coupled to the signal means for providing a stator current of a desired frequency and phase displacement to the motor. A power supply means is coupled to the stator winding energization means for regulating the magnitude of the stator current to a predetermined value responsive to the first signal means. The invention also obtains the speed control of self excited alternating current motors.
Inventors
- 👤 Charles E Rettig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 06:54
CPC Classifications
H; H02; H02P; H02P27/00; H02P27/04; H02P27/06; H02P25/00; H02P25/02; H02P25/08; H02P25/092; H02P25/0925; H02P27/048; H02P3/00; H02P3/06; H02P3/065; H02P2207/00; H02P2207/01; H02P27/047
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
467 words
A motor control interposible between an electrical energy source and the stator winding of a synchronous reluctance motor for controlling the torque developed by the motor wherein the motor has a direct axis flux producing exciting current, said control comprising: fiRst signal means for generating a torque command signal indicative of the desired motor output torque condition independently of existing motor conditions; second signal means coupled to the motor for providing a signal indicative of the rotor frequency of the motor rotor; stator winding energization means connectable to the stator winding of the motor for energizing the stator winding with a cyclical stator current, said stator winding energization means including signal responsive stator current frequency establishing means, said frequency establishing means being coupled to said second signal means and operable by said rotor frequency signal for establishing the frequency of the cyclical stator current at that of the rotor frequency; signal responsive stator current phase displacement establishing means coupled to said first signal means and said stator winding energization means for establishing the phase displacement of the stator current as a predetermined function of the torque command signal; power supply means responsive to an input signal for regulating the magnitude of the stator current in accordance therewith, said power supply means connectable to the electrical energy source and coupled to said stator winding energization means for providing an adjustable current to the stator winding energization means, said power supply means including a current regulation stabilizing inductor regulating the output current of said power supply means to a substantially desired magnitude; and stator current magnitude establishing means coupled to said first signal means and to said power supply means and responsive to said torque command signal for establishing the magnitude of the stator current as a predetermined function of said signal, said stator current magnitude establishing means includes a first function generator imposed between said first signal means and said power supply means and responsive to said torque command signal for providing the input signal to said power supply means having a predetermined function with respect to the torque command signal to cause said power supply means to provide stator current magnitudes tending to maintain desired flux levels in the motor, said phase displacement establishing means phase displacing the stator current with respect to the exciting current responsive to a control signal including a second function generator interposed between said first signal means and said stator winding energization means, said second function generator being responsive to said torque command signal for providing a control signal to said stator winding energization means having a predetermined function with respect to the torque command signal for altering the phase displacement of the stator current with respect to the exciting current by amounts tending to maintain desired flux levels in the motor.
Claim 2
Dependent Claim
467 words
A motor control interposible between an electrical energy source and the stator winding of a synchronous reluctance motor for controlling the torque developed by the motor wherein the motor has a direct axis flux producing exciting current, said control comprising: fiRst signal means for generating a torque command signal indicative of the desired motor output torque condition independently of existing motor conditions; second signal means coupled to the motor for providing a signal indicative of the rotor frequency of the motor rotor; stator winding energization means connectable to the stator winding of the motor for energizing the stator winding with a cyclical stator current, said stator winding energization means including signal responsive stator current frequency establishing means, said frequency establishing means being coupled to said second signal means and operable by said rotor frequency signal for establishing the frequency of the cyclical stator current at that of the rotor frequency; signal responsive stator current phase displacement establishing means coupled to said first signal means and said stator winding energization means for establishing the phase displacement of the stator current as a predetermined function of the torque command signal; power supply means responsive to an input signal for regulating the magnitude of the stator current in accordance therewith, said power supply means connectable to the electrical energy source and coupled to said stator winding energization means for providing an adjustable current to the stator winding energization means, said power supply means including a current regulation stabilizing inductor regulating the output current of said power supply means to a substantially desired magnitude; and stator current magnitude establishing means coupled to said first signal means and to said power supply means and responsive to said torque command signal for establishing the magnitude of the stator current as a predetermined function of said signal, said stator current magnitude establishing means includes a first function generator imposed between said first signal means and said power supply means and responsive to said torque command signal for providing the input signal to said power supply means having a predetermined function with respect to the torque command signal to cause said power supply means to provide stator current magnitudes tending to maintain desired flux levels in the motor, said phase displacement establishing means phase displacing the stator current with respect to the exciting current responsive to a control signal including a second function generator interposed between said first signal means and said stator winding energization means, said second function generator being responsive to said torque command signal for providing a control signal to said stator winding energization means having a predetermined function with respect to the torque command signal for altering the phase displacement of the stator current with respect to the exciting current by amounts tending to maintain desired flux levels in the motor.
Claim 3
Dependent Claim
57 words
The motor control according to claim 1 wherein said phase displacement establishing means is further defined as coupled to said second signal means and including means for phase displacing the rotor frequency signal responsive to the torque command signal for alternating the phase displacement of the stator current as a predetermined function of the torque command signal.
Claim 4
Dependent Claim
63 words
The motor control according to claim 1 wherein said phase displacment establishing means is further defined as having said second function generator coupled to said second signal means and as including means for phase displacing the rotor frequency signal responsive to the torque command signal for altering the phase displacement of the stator current as a predetermined function of the torque command signal.
Claim 5
Dependent Claim
47 words
The motor control according to claim 1 wherein said phase displacment establishing means includes a timing means interposed between said second signal means and said stator winding energization means for altering the phase displacment of the stator current as a predetermined function of the torque command signal.
Claim 6
Dependent Claim
50 words
The motor contRol according to claim 1 wherein said phase displacment establishing means includes a timing means interposed between said second signal means and said stator winding energization means and wherein said second function generator is coupled to said timing means for controlling the phase displacement of the stator current.
Claim 7
Dependent Claim
51 words
The motor control according to claim 1 wherein said frequency establishing means responsive to the rotor including frequency correlation means responsive to the rotor frequency output signal for providing a signal to said stator winding energization means for establishing the frequency of the cyclical current in accordance with the rotor frequency.
Claim 8
Dependent Claim
45 words
The motor control according to claim 6 wherein said frequency correlation means is further defined as coupled to said phase displacement establishing means and as including means for effecting the phase displacement of the stator current as a predetermined function of the torque command signal.
Claim 9
Dependent Claim
25 words
The motor control according to claim 7 wherein said second function generator is coupled to said means for effecting phase displacement of the stator current.
Claim 10
Dependent Claim
36 words
The motor control of claim 1 further defined as controlling the speed of the motor and wherein said first signal means is further including means for providing a speed error signal as the torque command signal.
Claim 11
Dependent Claim
73 words
The motor control according to claim 9 wherein said first signal means includes means for providing a signal indicative of a desired speed of the motor, means for providing a signal indicative of the actual speed of the motor, and summing junction means receiving said desired speed signal and said actual speed signal for providing a torque command signal representative of the difference between said desired speed signal and said actual speed signal.
Claim 12
Dependent Claim
31 words
The motor control according to claim 9 wherein said first signal means includes limiting means for coordinately limiting the magnitude and phase displacment of the stator current under excessive torque conditions.
Claim 13
Dependent Claim
44 words
The motor control according to claim 10 including signal limiting means coupled to said summing junction means for limiting the magnitude of said torque command signal for coordinately limiting the magnitude and phase displacment of the stator current under excessive torque command signal conditions.
Claim 14
Dependent Claim
33 words
The motor control according to claim 1 wherein said power supply means provides an adjustable unidirectional current to said stator winding energization means and wherein said stator winding energization means includes an inverter.
Claim 15
Dependent Claim
22 words
The motor control according to claim 13 wherein said inverter is further defined as being of the capacitor commutated, diode isolated type.
Claim 16
Dependent Claim
35 words
The motor control according to claim 13 having a plurality of inverters connectable to the stator winding of the motor and coupled to said power supply means for energizing the stator winding with cyclical current.
Claim 17
Dependent Claim
119 words
The motor control according to claim 13 for controlling the torque developed by the motor in both the motoring and regenerative modes of operation, the change from operation in the motoring mode to operation in the regenerative mode being accompanied by the reversal of the voltage polarity in the power supply means, and wherein said power supply means is so constructed as to provide an adjustable unidirectional current to said inverter regardless of the polarity of the voltage impressed on said power supply means, whereby said power supply means may supply adjustable current to the motor from the electrical energy source during the motoring operation and supply energization from the motor to the electrical energy source during regenerative operation.
Claim 18
Dependent Claim
48 words
The motor control according to claim 13 connectable to an electrical energy source of the alternating current voltage type, wherein said power supply means includes thyristor means having conductive and non conductive states for providing said adjustable undirectional current by rectifying half cycles of the aLternating current voltage.
Claim 19
Dependent Claim
47 words
The motor control according to claim 13 wherein the electrical energy source is a direct current voltage source and wherein said power supply means includes adjustable direct current voltage means connectable to the direct current source for providing said adjustable unidirectional current of the power supply means.
Claim 20
Dependent Claim
118 words
The motor control means according to claim 18 for controlling the torque developed by the motor in the motoring and regenerative modes of operation, the change from operation in the motoring mode to operation in the regenerative mode being accompanied by a reversal of the voltage polarity in the power supply means, wherein said adjustable direct voltage means is so constructed as to provide said adjustable unidirectional current to said inverter regardless of the polarity of the voltage impressed on said power supply means, whereby said power supply means may supply adjustable current from the direct current source to the motor during motoring operation and supply energization from the motor to the direct current source during regenerative operation.
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) | 1978-01-27 | 1978-07-29 | 1979-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-27 | 1982-07-29 | 1983-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-27 | 1986-07-29 | 1987-01-28 | $7700.00 | Window Closed / Lapsed |