JPS57170087A - Overcurrent disconnecting circuit for dc motor - Google Patents

Overcurrent disconnecting circuit for dc motor

Info

Publication number
JPS57170087A
JPS57170087A JP56054906A JP5490681A JPS57170087A JP S57170087 A JPS57170087 A JP S57170087A JP 56054906 A JP56054906 A JP 56054906A JP 5490681 A JP5490681 A JP 5490681A JP S57170087 A JPS57170087 A JP S57170087A
Authority
JP
Japan
Prior art keywords
motor
overcurrent
series
resistor
transistors
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
JP56054906A
Other languages
Japanese (ja)
Inventor
Hiromitsu Nakano
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial 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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP56054906A priority Critical patent/JPS57170087A/en
Publication of JPS57170087A publication Critical patent/JPS57170087A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
    • H02H7/0811—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors for dc motors

Landscapes

  • Protection Of Generators And Motors (AREA)
  • Control Of Direct Current Motors (AREA)

Abstract

PURPOSE:To protect the DC motor and the speed control unit thereof from the overcurrent by a method wherein the overcurrent is disconnected after the overcurrent is detected by means of the resistor connected to the DC motor in series and delayed for the specified time in the time constant circuit. CONSTITUTION:When the current I to be supplied for the bridge circuit is increased due to the lock and the overload, the terminal voltage of the resistor 2 connected to the DC motor 1 in series is boosted. Then the output voltage of the time constant circuit 18 comprising the resistor 16 and the condenser 17 connected in series is increased making the transistors 19, 20 and 23 conductive if said voltage exceeds the specified value. Through these procedures, the transistors 10, 9 are disconnected to disconnect the current I to be supplied for the bridge circuit stopping the DC motor 1.
JP56054906A 1981-04-10 1981-04-10 Overcurrent disconnecting circuit for dc motor Pending JPS57170087A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56054906A JPS57170087A (en) 1981-04-10 1981-04-10 Overcurrent disconnecting circuit for dc motor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56054906A JPS57170087A (en) 1981-04-10 1981-04-10 Overcurrent disconnecting circuit for dc motor

Publications (1)

Publication Number Publication Date
JPS57170087A true JPS57170087A (en) 1982-10-20

Family

ID=12983639

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56054906A Pending JPS57170087A (en) 1981-04-10 1981-04-10 Overcurrent disconnecting circuit for dc motor

Country Status (1)

Country Link
JP (1) JPS57170087A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63138899U (en) * 1987-02-28 1988-09-13

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5250328U (en) * 1975-10-09 1977-04-09

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5250328U (en) * 1975-10-09 1977-04-09

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63138899U (en) * 1987-02-28 1988-09-13

Similar Documents

Publication Publication Date Title
DE3169082D1 (en) Short-circuit protection device for a direct current actuator
JPS5657316A (en) Electric power amplifier
JPS5614323A (en) Control method of electric power equipment
JPS57170087A (en) Overcurrent disconnecting circuit for dc motor
JPS57211421A (en) Wire cut discharge machining power source equipment
JPS5425415A (en) Inverter controller
ES8301081A1 (en) Speed control means of an electrical motor of a washing machine.
JPS538910A (en) Electric rolling stock controlling device
JPS5233055A (en) Switching method of power source
JPS54137618A (en) Braking controller for dc motor
JPS5477344A (en) Controlling system of air-conditioner
JPS55108008A (en) Initial value set system for servo circuit
JPS5563600A (en) Car generator
JPS5454231A (en) Protective circuit for voltage type inverter
JPS561620A (en) Output circuit
JPS5563410A (en) Temperature control unit
JPS5556496A (en) Motor speed control device
SU1014088A1 (en) Device for current protection of electric motor
JPS55162804A (en) Speed controller for electric vehicle
JPS54159648A (en) Protection circuit for electric apparatus
JPS6416279A (en) Starter for single-phase induction motor
JPS5445741A (en) Control system of inverter
JPS5568644A (en) Mounting method of semiconductor
JPS567114A (en) Electric power unit
JPS5619303A (en) Protective device for chopper of electric rolling stock