GB1467041A – Control system for induction motor
– Google Patents
GB1467041A – Control system for induction motor
– Google Patents
Control system for induction motor
Info
Publication number
GB1467041A
GB1467041A
GB757674A
GB757674A
GB1467041A
GB 1467041 A
GB1467041 A
GB 1467041A
GB 757674 A
GB757674 A
GB 757674A
GB 757674 A
GB757674 A
GB 757674A
GB 1467041 A
GB1467041 A
GB 1467041A
Authority
GB
United Kingdom
Prior art keywords
signal
limiter
motor
slip frequency
signals
Prior art date
1973-02-20
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
GB757674A
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.)
General Electric Co
Original Assignee
General Electric Co
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.)
1973-02-20
Filing date
1974-02-19
Publication date
1977-03-16
1973-02-20
Priority claimed from US00334118A
external-priority
patent/US3829786A/en
1973-05-09
Priority claimed from US00358509A
external-priority
patent/US3851234A/en
1974-02-19
Application filed by General Electric Co
filed
Critical
General Electric Co
1977-03-16
Publication of GB1467041A
publication
Critical
patent/GB1467041A/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
Abstract
1467041 Control of A.C. motors GENERAL ELECTRIC CO 19 Feb 1974 [20 Feb 1973 9 May 1973] 7576/74 Heading H2J A three-phase reversible squirrel-cage induction motor 10 is operated as a motor or generator in conditions of non-saturation of the magnetic circuit of its core, with acceleration or deceleration at maximum torque, by a control circuit comprising a drive unit (or frequency changer) 40 supplying the motor with a sinusoidal alternating voltage of frequency and amplitude determined by signals # s , E which, during motor operation in a normal range, are the same as signals # SC , E C supplied from a control signal generator (50), Fig. 6 (not shown), and signal limiters 150, 80, which define the normal range between limits # SA , # SD for the signal w SC and between an upper limit E L (determined by a voltage limiter 70) and a lower limit O (dependent on # SD ) for the signal E c , all these limits being dependent on the actual speed # r of the motor sensed by a tachometer 20 and on signals #p and (-)#p, respectively, corresponding to the slip frequency during acceleration and deceleration providing the maximum torque without core saturation. Signals #p, # r and (-)#p, # r are summed at junctions 301, 311 to provide the limits # SA , # SD for limiter 150, whose output signal # s is applied to unit 40, limiter 70 and a subtraction junction 60, which also receives the signal # r to produce a signal # of actual slip frequency applied to limiter 70. The output E L of limiter 70 controls limiter 80 and is a function of the synchronous frequency signal # s and the actual slip frequency signal #, equations for E L and the magnetizing current I M being derived from the design parameters of the motor to relate the slip frequency #p for maximum torque T M with the current I M . Thus a family of torque/slip frequency characteristics may be obtained for various values of I M up to that corresponding to the onset of saturation, Fig. 2 (not shown), the value of E L also depending on the selected value of I M . The torque/slip frequency characteristic for motor or generator operation with maximum magnetizing current I M is discussed, Fig. 3 (not shown). Also described are the circuit details of limiter 70, Figs. 4 and 5 (not shown), and limiters 80, 150, Figs. 7 and 8 (not shown).
GB757674A
1973-02-20
1974-02-19
Control system for induction motor
Expired
GB1467041A
(en)
Applications Claiming Priority (2)
Application Number
Priority Date
Filing Date
Title
US00334118A
US3829786A
(en)
1973-02-20
1973-02-20
Dynamic constraint of a control signal
US00358509A
US3851234A
(en)
1973-05-09
1973-05-09
Control system for obtaining and using the optimum speed torque characteristic for a squirrel cage induction motor which guarantees a non-saturating magnetizing current
Publications (1)
Publication Number
Publication Date
GB1467041A
true
GB1467041A
(en)
1977-03-16
Family
ID=26989050
Family Applications (1)
Application Number
Title
Priority Date
Filing Date
GB757674A
Expired
GB1467041A
(en)
1973-02-20
1974-02-19
Control system for induction motor
Country Status (5)
Country
Link
JP
(1)
JPS49114025A
(en)
DE
(1)
DE2407792A1
(en)
FR
(1)
FR2218692A1
(en)
GB
(1)
GB1467041A
(en)
IT
(1)
IT1008891B
(en)
Families Citing this family (3)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
HU180770B
(en)
*
1979-10-02
1983-04-29
Viktor Gyoergyi
Circuit array for controlling induction motor drive
JPS5967896A
(en)
*
1982-10-12
1984-04-17
Mitsubishi Electric Corp
Slip limit control system for inverter device
JPS6348180A
(en)
*
1986-04-11
1988-02-29
Nippon Electric Ind Co Ltd
Adjustable speed controller using sliding speed
1974
1974-02-19
DE
DE19742407792
patent/DE2407792A1/en
active
Pending
1974-02-19
GB
GB757674A
patent/GB1467041A/en
not_active
Expired
1974-02-20
IT
IT4853074A
patent/IT1008891B/en
active
1974-02-20
FR
FR7405771A
patent/FR2218692A1/fr
not_active
Withdrawn
1974-02-20
JP
JP49020339A
patent/JPS49114025A/ja
active
Pending
Also Published As
Publication number
Publication date
FR2218692A1
(en)
1974-09-13
DE2407792A1
(en)
1974-09-19
JPS49114025A
(en)
1974-10-31
IT1008891B
(en)
1976-11-30
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Legal Events
Date
Code
Title
Description
1977-07-27
PS
Patent sealed
1978-09-20
PCNP
Patent ceased through non-payment of renewal fee
