JPS57129185A - Speed control circuit for motor - Google Patents

Speed control circuit for motor

Info

Publication number
JPS57129185A
JPS57129185A JP56016011A JP1601181A JPS57129185A JP S57129185 A JPS57129185 A JP S57129185A JP 56016011 A JP56016011 A JP 56016011A JP 1601181 A JP1601181 A JP 1601181A JP S57129185 A JPS57129185 A JP S57129185A
Authority
JP
Japan
Prior art keywords
motor
rotating speed
voltage
capacitor
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
JP56016011A
Other languages
Japanese (ja)
Inventor
Uichiro Sawabe
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.)
Sharp Corp
Original Assignee
Sharp 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 Sharp Corp filed Critical Sharp Corp
Priority to JP56016011A priority Critical patent/JPS57129185A/en
Publication of JPS57129185A publication Critical patent/JPS57129185A/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
    • H02P25/00—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details
    • H02P25/16—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the circuit arrangement or by the kind of wiring
    • H02P25/18—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the circuit arrangement or by the kind of wiring with arrangements for switching the windings, e.g. with mechanical switches or relays
    • H02P25/182—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the circuit arrangement or by the kind of wiring with arrangements for switching the windings, e.g. with mechanical switches or relays whereby the speed is regulated by using centrifucal devices, e.g. switch, resistor

Landscapes

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

Abstract

PURPOSE:To inexpensively provide a control circuit by detecting the rotating speed of a motor with a magnet and a reed switch, thereby eliminating a tachometer generator. CONSTITUTION:When a motor 2 is rotated, a pulley 28 rotates at the speed proportional to the rotating speed, and a reed switch 32 is switched ON or OFF by a magnet 1. When the switch 32 is OFF, a current flows in the sequence of a diode 42, a capacitor 47 and a resistor 52, thereby charging a capacitor 47. Then, when the switch 32 is ON, a transistor 35 is conducted, and the voltage of the capacitor 47 becomes the emitter potential of the transistor 35. Thus, the cathode voltage of the diode 41 is varied in response to the rotating speed of the motor 2. When the rotating speed, for example, gets high, the cathode voltage is raised, and when it becomes higher than the potential of the divided voltage of the resistors 55, 56, the gate potential of a PUT 34 is raised, thereby reducing the voltage applied to the motor 2, and the speed is restored to the constant value.
JP56016011A 1981-02-02 1981-02-02 Speed control circuit for motor Pending JPS57129185A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56016011A JPS57129185A (en) 1981-02-02 1981-02-02 Speed control circuit for motor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56016011A JPS57129185A (en) 1981-02-02 1981-02-02 Speed control circuit for motor

Publications (1)

Publication Number Publication Date
JPS57129185A true JPS57129185A (en) 1982-08-11

Family

ID=11904636

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56016011A Pending JPS57129185A (en) 1981-02-02 1981-02-02 Speed control circuit for motor

Country Status (1)

Country Link
JP (1) JPS57129185A (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5033206A (en) * 1973-06-07 1975-03-31

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5033206A (en) * 1973-06-07 1975-03-31

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