JPS5619396A - Ac motor speed control device - Google Patents

Ac motor speed control device

Info

Publication number
JPS5619396A
JPS5619396A JP9372279A JP9372279A JPS5619396A JP S5619396 A JPS5619396 A JP S5619396A JP 9372279 A JP9372279 A JP 9372279A JP 9372279 A JP9372279 A JP 9372279A JP S5619396 A JPS5619396 A JP S5619396A
Authority
JP
Japan
Prior art keywords
output
inverter
frequency
circuit
switch
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.)
Pending
Application number
JP9372279A
Other languages
Japanese (ja)
Inventor
Takao Miyamoto
Toshio Kawaguchi
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.)
Hitachi Ltd
Original Assignee
Hitachi Ltd
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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP9372279A priority Critical patent/JPS5619396A/en
Publication of JPS5619396A publication Critical patent/JPS5619396A/en
Pending 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
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Control Of Ac Motors In General (AREA)

Abstract

PURPOSE:To stabilize the operation of an AC motor in low load by varying the polarity of deviation between a command value and an inverter output according to the driving and the regenerative times so that in either case the ratio of the output voltage of the inverter to the frequency is constant. CONSTITUTION:An output from a discriminator 45 closes the switch 47 of a switching circuit 44 at driving time, the output from an operational amplifier 42 is compared directly with the output of a command circuit 34 by an arithmetic unit 53 to close the switch 46 at the regenerative time and to compare the output of the amplifier 42 with the reverse polarity through the polarity inverter circuit 43 to that at the driving time. When the voltage and the frequency in ratio is increased due to the load variation, the output of the arithmetic unit 35 for controlling the current is always positive. Accordingly, the switch 47 is closed to cause the output of the amplifier 43 to become negative to increase the input of the voltage-to-frequency converter 38 so as to increase the frequency of an inverter 28. In the case of regeneration, the ratio becomes larger to cause the output of the arithmetic unit 36 to become positive. Accordingly, it causes the output of the circuit 43 to become positive to reduce the frequency of the inverter 28.
JP9372279A 1979-07-25 1979-07-25 Ac motor speed control device Pending JPS5619396A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9372279A JPS5619396A (en) 1979-07-25 1979-07-25 Ac motor speed control device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9372279A JPS5619396A (en) 1979-07-25 1979-07-25 Ac motor speed control device

Publications (1)

Publication Number Publication Date
JPS5619396A true JPS5619396A (en) 1981-02-24

Family

ID=14090294

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9372279A Pending JPS5619396A (en) 1979-07-25 1979-07-25 Ac motor speed control device

Country Status (1)

Country Link
JP (1) JPS5619396A (en)

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