JPS5678384A - Torque controlling device of variable-speed motor - Google Patents

Torque controlling device of variable-speed motor

Info

Publication number
JPS5678384A
JPS5678384A JP15383179A JP15383179A JPS5678384A JP S5678384 A JPS5678384 A JP S5678384A JP 15383179 A JP15383179 A JP 15383179A JP 15383179 A JP15383179 A JP 15383179A JP S5678384 A JPS5678384 A JP S5678384A
Authority
JP
Japan
Prior art keywords
speed
electric motor
low
current amplifier
output
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
JP15383179A
Other languages
Japanese (ja)
Inventor
Akio Ihara
Masayuki Ishibashi
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.)
Meidensha Electric Manufacturing Co Ltd
Original Assignee
Meidensha Electric Manufacturing Co 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 Meidensha Electric Manufacturing Co Ltd filed Critical Meidensha Electric Manufacturing Co Ltd
Priority to JP15383179A priority Critical patent/JPS5678384A/en
Publication of JPS5678384A publication Critical patent/JPS5678384A/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
    • 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

Abstract

PURPOSE:To reduce a torque in a low-speed region by a method wherein a curve generator varying curvilinearly a speed detecting signal of an electric motor with an increase of speed and the output thereof is fed to a current amplifier to control a firing phase of a power inverter. CONSTITUTION:A curve generator 24 comprising a multiplier or a function generator etc. is provided in an automatic speed control circuit 13 controlling a firing phase of a power inverter 9 of static type Scherbius device. An output of a detector 6 detecting a number of rotations of an electric motor 3 is curvilinearly changed with an increase of speed to be applied to an inverted amplifier together with the signal from a speed setter 26, and the output controls a current amplifier 22 to cause the firing phase to be controlled. Accordingly, since amplification by the current amplifier 22 is suppressed to make the frequency of a firing signal long when the speed is low, the maximum torque which the electric motor can feed becomes small in low speed to enable bad influences upon a pump and blower to be removed.
JP15383179A 1979-11-27 1979-11-27 Torque controlling device of variable-speed motor Pending JPS5678384A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15383179A JPS5678384A (en) 1979-11-27 1979-11-27 Torque controlling device of variable-speed motor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15383179A JPS5678384A (en) 1979-11-27 1979-11-27 Torque controlling device of variable-speed motor

Publications (1)

Publication Number Publication Date
JPS5678384A true JPS5678384A (en) 1981-06-27

Family

ID=15571034

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15383179A Pending JPS5678384A (en) 1979-11-27 1979-11-27 Torque controlling device of variable-speed motor

Country Status (1)

Country Link
JP (1) JPS5678384A (en)

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