GB1255040A - Speed and voltage controls for a.c. motors - Google Patents

Speed and voltage controls for a.c. motors

Info

Publication number
GB1255040A
GB1255040A GB1237469A GB1237469A GB1255040A GB 1255040 A GB1255040 A GB 1255040A GB 1237469 A GB1237469 A GB 1237469A GB 1237469 A GB1237469 A GB 1237469A GB 1255040 A GB1255040 A GB 1255040A
Authority
GB
United Kingdom
Prior art keywords
voltage
capacitor
regulator
frequency
rectifier
Prior art date
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
GB1237469A
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.)
Danfoss AS
Original Assignee
Danfoss AS
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.)
Filing date
Publication date
Application filed by Danfoss AS filed Critical Danfoss AS
Publication of GB1255040A publication Critical patent/GB1255040A/en
Expired legal-status Critical Current

Links

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
    • 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
    • H02P27/06—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 dc to ac converters or inverters
    • 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
    • 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

1,255,040. Control of A.C. motors. DANFOSS A.S. 10 March, 1969 [16 March, 1968], No. 12374/69. Heading H2J. An asynchronous motor 26 is supplied from rectifier 12 through a voltage regulator 15 associated with a battery-fed resistor 16, for adjusting the output voltage of the regulator, and a voltage divider 18, 19, connected across leads 13, 14. An intermediate circuit comprises choke 21 and capacitor 22 for smoothing voltage U1 which is applied to an inverter comprising controlled rectifiers 24 and diodes 25, and incorporating a common quenching circuit 27. The voltage U1 is also applied to frequency regulator 29 which transmits pulses to a control device 30 feeding the quenching circuit 27, at a frequency much greater than the mains frequency, and which provides the rectifiers 24 with triggering pulses. When the regulator voltage is reduced for lowering the motor speed, the frequency is also reduced but the motor operates only slightly above synchronous speed and the regenerated current is easily absorbed by the capacitor 22. The voltage regulator 15 may comprise a controlled rectifier shunted by a diode, a quenching rectifier, and a series arrangement comprising a choke and a commutating capacitor. The controlled rectifier is triggered to pass pulses at a predetermined frequency, the width of these pulses being determined by the firing of the quenching rectifier in dependence upon the required voltage, Fig. 5 (not shown). The frequency regulator 29 comprises a transistor which receives the control voltage U1 and charges a capacitor in proportion. When the capacitor voltage reaches a threshold value, the capacitor discharges through a unijunction transistor the base of which is connected to output terminals through a transformer, Fig. 7 (not shown).
GB1237469A 1968-03-16 1969-03-10 Speed and voltage controls for a.c. motors Expired GB1255040A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19681613776 DE1613776B2 (en) 1968-03-16 1968-03-16 PROCEDURE FOR THE SPEED AND VOLTAGE CONTROL OF AN AC MOTOR IN PARTICULAR THREE-PHASE AC MOTORS

Publications (1)

Publication Number Publication Date
GB1255040A true GB1255040A (en) 1971-11-24

Family

ID=5681903

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1237469A Expired GB1255040A (en) 1968-03-16 1969-03-10 Speed and voltage controls for a.c. motors

Country Status (5)

Country Link
CH (1) CH497079A (en)
DE (1) DE1613776B2 (en)
FR (1) FR2004061A1 (en)
GB (1) GB1255040A (en)
SE (1) SE360957C (en)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL7706751A (en) * 1977-06-20 1978-12-22 Philips Nv MOTOR CONTROL.
US4292577A (en) * 1979-03-12 1981-09-29 Kearney & Trecker Corporation A.C. Motor control circuit
JPS5917636B2 (en) * 1979-07-13 1984-04-23 東洋電機製造株式会社 PWM inverter device
DE3021119C2 (en) * 1980-06-04 1986-08-14 Danfoss A/S, Nordborg Inverter circuit for operating an asynchronous motor with controllable speed
CH645220A5 (en) * 1981-12-28 1984-09-14 Spincor Sa DEVICE FOR STABILIZING THE TORQUE OF AN ELECTRIC MOTOR WITH ELECTRONIC COMMUTATION.
DE3204864C2 (en) * 1982-02-11 1986-01-09 Siemens AG, 1000 Berlin und 8000 München Speed-controllable electrical machine fed by a converter
DE3326536A1 (en) * 1983-07-22 1985-02-07 Maschinenfabrik Stahlkontor Weser Lenze GmbH & Co KG, 3251 Aerzen Method and circuit arrangement for limiting the intermediate circuit voltage of a pulse inverter supplying an AC motor

Also Published As

Publication number Publication date
FR2004061A1 (en) 1969-11-21
SE360957C (en) 1975-11-20
DE1613776A1 (en) 1971-11-25
CH497079A (en) 1970-09-30
DE1613776B2 (en) 1971-11-25
SE360957B (en) 1973-10-08

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