JPS57132787A - Speed controlling device for motor - Google Patents

Speed controlling device for motor

Info

Publication number
JPS57132787A
JPS57132787A JP56016506A JP1650681A JPS57132787A JP S57132787 A JPS57132787 A JP S57132787A JP 56016506 A JP56016506 A JP 56016506A JP 1650681 A JP1650681 A JP 1650681A JP S57132787 A JPS57132787 A JP S57132787A
Authority
JP
Japan
Prior art keywords
signal
speed
motor
generator
rotating speed
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
JP56016506A
Other languages
Japanese (ja)
Inventor
Akira Sugiyama
Kunio Hirota
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.)
Brother Industries Ltd
Original Assignee
Brother Industries 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 Brother Industries Ltd filed Critical Brother Industries Ltd
Priority to JP56016506A priority Critical patent/JPS57132787A/en
Publication of JPS57132787A publication Critical patent/JPS57132787A/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
    • H02H7/0833—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 electric motors with control arrangements

Abstract

PURPOSE:To eliminate the speed of a motor due to its overheat by discriminating the abnormal temperature of the motor based on a temperature detection signal and switching the speed command signal from the first speed signal generator to the second speed signal generator. CONSTITUTION:The rotating speed of a motor 3 for a sewing machine is controlled by passing a signal of the first speed signal generator 17 and a signal of the second speed signal generator 18 for instructing a rotating speed lower than the signal of the first generator through a switching circuit 19. A temperature detector 15 is provided at a housing of a motor 2, the signal of the detector is inputted to a discriminator 16, and the circuit 19 is controlled by the output signal of the discriminator. Accordingly, when the motor 2 continues the maximum speed operation to be overheated, a command signal is automatically switched from the generator 17 to the generator 18, thereby lowering the rotating speed, and improving the working efficiency without stopping the motor 3 at every overheated time.
JP56016506A 1981-02-05 1981-02-05 Speed controlling device for motor Pending JPS57132787A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56016506A JPS57132787A (en) 1981-02-05 1981-02-05 Speed controlling device for motor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56016506A JPS57132787A (en) 1981-02-05 1981-02-05 Speed controlling device for motor

Publications (1)

Publication Number Publication Date
JPS57132787A true JPS57132787A (en) 1982-08-17

Family

ID=11918156

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56016506A Pending JPS57132787A (en) 1981-02-05 1981-02-05 Speed controlling device for motor

Country Status (1)

Country Link
JP (1) JPS57132787A (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5199116A (en) * 1975-01-23 1976-09-01 Bayer Ag KAIRYOSARETAKASENSHOKUSEIOJUSURUFUIRAMENTOOYOBISENI

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5199116A (en) * 1975-01-23 1976-09-01 Bayer Ag KAIRYOSARETAKASENSHOKUSEIOJUSURUFUIRAMENTOOYOBISENI

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