JPS56159987A - Protecting device of motor from overheat - Google Patents

Protecting device of motor from overheat

Info

Publication number
JPS56159987A
JPS56159987A JP6171280A JP6171280A JPS56159987A JP S56159987 A JPS56159987 A JP S56159987A JP 6171280 A JP6171280 A JP 6171280A JP 6171280 A JP6171280 A JP 6171280A JP S56159987 A JPS56159987 A JP S56159987A
Authority
JP
Japan
Prior art keywords
motor
overheat
transistor
flip
resistor
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
JP6171280A
Other languages
Japanese (ja)
Other versions
JPS6323737B2 (en
Inventor
Michio Hisatake
Kazuji Yamamoto
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.)
Janome Corp
Original Assignee
Janome Sewing Machine 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 Janome Sewing Machine Co Ltd filed Critical Janome Sewing Machine Co Ltd
Priority to JP6171280A priority Critical patent/JPS56159987A/en
Publication of JPS56159987A publication Critical patent/JPS56159987A/en
Publication of JPS6323737B2 publication Critical patent/JPS6323737B2/ja
Granted 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
    • H02H7/085—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 against excessive load
    • H02H7/0852—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 against excessive load directly responsive to abnormal temperature by using a temperature sensor

Landscapes

  • Control Of Electric Motors In General (AREA)
  • Control Of Ac Motors In General (AREA)
  • Control Of Direct Current Motors (AREA)
  • Protection Of Generators And Motors (AREA)

Abstract

PURPOSE:To enable the detection of overheat of a motor without providing a heat- sensitive unit by a method wherein a current concerned with a resistance value of a motor coil is identified to detect the overheat of the motor, in the break section of a waveform of a voltage supplied to the motor. CONSTITUTION:A transistor Tr2 is discontinued because an electric potential divided by a resistor VR and a field coil ST is a low potential when the motor is at normal temperature, and accordingly, an output Q' of a flip-flop circuit FF is left on a low level. If the temperature in the motor rises to abnormal temperature, the potential divided by the resistor VR and the field coil ST increases during the arc- extinguishing period of a thyristor SCR, and the transistor Tr2 is continued. Thereby, the output Q' of the flip-flop circuit FF is raised on a high level to cause a transistor Tr3 to be continued, a buzzer BZ to be operated and also a gate current of the thyristor SCR to be by-passed.
JP6171280A 1980-05-12 1980-05-12 Protecting device of motor from overheat Granted JPS56159987A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6171280A JPS56159987A (en) 1980-05-12 1980-05-12 Protecting device of motor from overheat

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6171280A JPS56159987A (en) 1980-05-12 1980-05-12 Protecting device of motor from overheat

Publications (2)

Publication Number Publication Date
JPS56159987A true JPS56159987A (en) 1981-12-09
JPS6323737B2 JPS6323737B2 (en) 1988-05-18

Family

ID=13179107

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6171280A Granted JPS56159987A (en) 1980-05-12 1980-05-12 Protecting device of motor from overheat

Country Status (1)

Country Link
JP (1) JPS56159987A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6096250A (en) * 1983-11-01 1985-05-29 スズキ株式会社 Safety apparatus of electromotive wheelchair
JPS60156897U (en) * 1984-03-26 1985-10-18 株式会社明電舎 Servo motor drive device for manipulator

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50161656A (en) * 1974-06-18 1975-12-27

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50161656A (en) * 1974-06-18 1975-12-27

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6096250A (en) * 1983-11-01 1985-05-29 スズキ株式会社 Safety apparatus of electromotive wheelchair
JPH0526493B2 (en) * 1983-11-01 1993-04-16 Suzuki Co Ltd
JPS60156897U (en) * 1984-03-26 1985-10-18 株式会社明電舎 Servo motor drive device for manipulator
JPH0424797Y2 (en) * 1984-03-26 1992-06-11

Also Published As

Publication number Publication date
JPS6323737B2 (en) 1988-05-18

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