GB1389261A – Method and means for controlling the output conditions of a self-excited alternating current motor
– Google Patents
GB1389261A – Method and means for controlling the output conditions of a self-excited alternating current motor
– Google Patents
Method and means for controlling the output conditions of a self-excited alternating current motor
Info
Publication number
GB1389261A
GB1389261A
GB1308272A
GB1308272A
GB1389261A
GB 1389261 A
GB1389261 A
GB 1389261A
GB 1308272 A
GB1308272 A
GB 1308272A
GB 1308272 A
GB1308272 A
GB 1308272A
GB 1389261 A
GB1389261 A
GB 1389261A
Authority
GB
United Kingdom
Prior art keywords
torque
current
frequency
command signal
torque command
Prior art date
1972-03-21
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB1308272A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Western Atlas Inc
Original Assignee
Litton Industrial Products Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
1972-03-21
Filing date
1972-03-21
Publication date
1975-04-03
1972-03-21
Application filed by Litton Industrial Products Inc
filed
Critical
Litton Industrial Products Inc
1972-03-21
Priority to GB1308272A
priority
Critical
patent/GB1389261A/en
1975-04-03
Publication of GB1389261A
publication
Critical
patent/GB1389261A/en
Status
Expired
legal-status
Critical
Current
Links
Espacenet
Global Dossier
Discuss
Classifications
H—ELECTRICITY
H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
H02P23/00—Arrangements or methods for the control of AC motors characterised by a control method other than vector control
H02P23/08—Controlling based on slip frequency, e.g. adding slip frequency and speed proportional frequency
H—ELECTRICITY
H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
H02P23/00—Arrangements or methods for the control of AC motors characterised by a control method other than vector control
H02P23/06—Controlling the motor in four quadrants
H02P23/07—Polyphase or monophase asynchronous induction motors
H—ELECTRICITY
H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
H02P27/048—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using AC supply for only the rotor circuit or only the stator circuit
H—ELECTRICITY
H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
H02P2207/00—Indexing scheme relating to controlling arrangements characterised by the type of motor
H02P2207/01—Asynchronous machines
H—ELECTRICITY
H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
H02P27/047—V/F converter, wherein the voltage is controlled proportionally with the frequency
Abstract
1389261 Control of A.C. motors LITTON INDUSTRIAL PRODUCTS Inc 21 March 1972 13082/72 Heading H2J [Also in Division G3] Relates to control circuit arrangements for obtaining a desired torque condition in a squirrel cage induction motor. Arrangements for controlling the motor speed to a desired value by making a torque command signal proportional to a speed error, are also disclosed (Fig. 16). To obtain desired torque, the stator may be supplied with current I s the magnitude of which is regulated as a predetermined function of the torque command signal and the phase angle of which with respect to its «no torque» position when «slip» is zero (i.e. with respect to its magnetizing current component I m ), may be adjusted so that the magnetizing current I m is maintained constant. In addition, the slip frequency is adjusted to a required value by varying the frequency of the stator current I s or by varying the motor load. Induction motor control (Fig. 11).-In the control of an induction motor 22 a torque command signal is set up on a potentiometer 60. A function generator 94 relates this desired torque to the required stator current I s for both driving and braking torque, and feeds a desired current signal to a summing junction 90. The stator current is derived from A.C. source 62 via a rectifier unit 66 and a half-wave inverter 96. The summing junction 90 compares the required current value with the actual current value of the rectifier output fed back via a line 86 and adjusts the rectifier firing circuit 80 accordingly, whereby to maintain the correct magnitude of direct current to the inverter 96, via a smoothing choke 92. The inverter output frequency is determined by an oscillator circuit 126 which provides firing pulses to CR’s 104, 108, 112 via a ring counter 124. The oscillator pulse frequency is controlled by both a tacho-signal in a line 138 as a function of rotor speed or frequency f r and the torque command signal. The tacho-signal causes the oscillator to produce pulses at a frequency corresponding to the rotor frequency f r and the torque command signal increases or decreases the pulse rate by an amount corresponding to the necessary slip frequency. A second function generator 130 may be connected between the torque command and the oscillator and which will advance or retard the firing pulses. Thereby the stator current I s may be phase shifted by an angle 0 with respect to its no torque position, i.e. with respect to I m as shown Fig. 6 (I s being assumed to be in phase with I m when slip is zero). The counter e.m.f. across one stator winding is used as a reference for advance or retard of the firing pulses and I s . Thus the frequency, phase angle and magnitude of stator current I s are adjusted to produce the desired torque. It is stated that braking torque is also controlled when motor is in the regenerative mode. Speed control of induction motor.-Speed may also be controlled by making the torque command signal proportional to a speed error signal (Fig. 16). The concurrance of the required magnitude of stator current and necessary slip frequency provides an output torque condition tending to reduce speed error. A limit circuit limits the maximum output torque. In an alternative embodiment (Fig. 20, not shown) the control circuit is energized from a D.C. source via a current regulated D.C. chopper the output of which is fed to a full-wave three-phase inverter to energize an induction motor.
GB1308272A
1972-03-21
1972-03-21
Method and means for controlling the output conditions of a self-excited alternating current motor
Expired
GB1389261A
(en)
Priority Applications (1)
Application Number
Priority Date
Filing Date
Title
GB1308272A
GB1389261A
(en)
1972-03-21
1972-03-21
Method and means for controlling the output conditions of a self-excited alternating current motor
Applications Claiming Priority (1)
Application Number
Priority Date
Filing Date
Title
GB1308272A
GB1389261A
(en)
1972-03-21
1972-03-21
Method and means for controlling the output conditions of a self-excited alternating current motor
Publications (1)
Publication Number
Publication Date
GB1389261A
true
GB1389261A
(en)
1975-04-03
Family
ID=10016493
Family Applications (1)
Application Number
Title
Priority Date
Filing Date
GB1308272A
Expired
GB1389261A
(en)
1972-03-21
1972-03-21
Method and means for controlling the output conditions of a self-excited alternating current motor
Country Status (1)
Country
Link
GB
(1)
GB1389261A
(en)
Cited By (2)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
GB2301716A
(en)
*
1995-06-01
1996-12-11
Yang Tai Her
Phase angle control circuit for a switching device
WO2014206692A3
(en)
*
2013-06-25
2015-07-02
Robert Bosch Gmbh
Method and device for operating an asynchronous machine, and an asynchronous machine
1972
1972-03-21
GB
GB1308272A
patent/GB1389261A/en
not_active
Expired
Cited By (3)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
GB2301716A
(en)
*
1995-06-01
1996-12-11
Yang Tai Her
Phase angle control circuit for a switching device
WO2014206692A3
(en)
*
2013-06-25
2015-07-02
Robert Bosch Gmbh
Method and device for operating an asynchronous machine, and an asynchronous machine
US9641116B2
(en)
2013-06-25
2017-05-02
Robert Bosch Gmbh
Method and device for operating an asynchronous machine, and an asynchronous machine
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Legal Events
Date
Code
Title
Description
1975-08-13
PS
Patent sealed
1985-05-30
732
Registration of transactions, instruments or events in the register (sect. 32/1977)
1988-11-16
PCNP
Patent ceased through non-payment of renewal fee
