JPS5484217A - Induction motor rpm control system - Google Patents

Induction motor rpm control system

Info

Publication number
JPS5484217A
JPS5484217A JP15135977A JP15135977A JPS5484217A JP S5484217 A JPS5484217 A JP S5484217A JP 15135977 A JP15135977 A JP 15135977A JP 15135977 A JP15135977 A JP 15135977A JP S5484217 A JPS5484217 A JP S5484217A
Authority
JP
Japan
Prior art keywords
voltage
circuit
signal
rpm
transistor
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.)
Granted
Application number
JP15135977A
Other languages
Japanese (ja)
Other versions
JPS5911273B2 (en
Inventor
Hiroshi Ogino
Hideaki Tada
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP52151359A priority Critical patent/JPS5911273B2/en
Publication of JPS5484217A publication Critical patent/JPS5484217A/en
Publication of JPS5911273B2 publication Critical patent/JPS5911273B2/en
Expired legal-status Critical Current

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  • Control Of Ac Motors In General (AREA)

Abstract

PURPOSE: To permit omission of the hitherto required differential amplifier and simplification of the construction by restricting the primary voltage through reduction of an rpm setting signal with a primary voltage feedback signal of an induction motor.
CONSTITUTION: A voltage detection circuit 9 for detecting the output voltage of a control element circuit 2 for effecting phase control according to a signal of a firing circuit 7 and a transistor circuit 13 adapted to be operated when the voltage of the circuit 9 exceeds a predetermined value are provided, and with a voltage drop produced by collector current caused through a transistor 17 with the operation of the circuit 13 the rpm signal is reduced to reduce the rpm. Thus, it is possible to omit the hitherto required differential amplifier and make use of the transistor threshold voltage for the non-sensitive band of the voltage feed-back signal, thus permitting simplification of the construction.
COPYRIGHT: (C)1979,JPO&Japio
JP52151359A 1977-12-16 1977-12-16 Induction motor speed control device Expired JPS5911273B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP52151359A JPS5911273B2 (en) 1977-12-16 1977-12-16 Induction motor speed control device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP52151359A JPS5911273B2 (en) 1977-12-16 1977-12-16 Induction motor speed control device

Publications (2)

Publication Number Publication Date
JPS5484217A true JPS5484217A (en) 1979-07-05
JPS5911273B2 JPS5911273B2 (en) 1984-03-14

Family

ID=15516810

Family Applications (1)

Application Number Title Priority Date Filing Date
JP52151359A Expired JPS5911273B2 (en) 1977-12-16 1977-12-16 Induction motor speed control device

Country Status (1)

Country Link
JP (1) JPS5911273B2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60170685U (en) * 1984-04-18 1985-11-12 昭和アルミニウム株式会社 ice maker

Also Published As

Publication number Publication date
JPS5911273B2 (en) 1984-03-14

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