JPS55166487A - Variable speed motor - Google Patents

Variable speed motor

Info

Publication number
JPS55166487A
JPS55166487A JP7508579A JP7508579A JPS55166487A JP S55166487 A JPS55166487 A JP S55166487A JP 7508579 A JP7508579 A JP 7508579A JP 7508579 A JP7508579 A JP 7508579A JP S55166487 A JPS55166487 A JP S55166487A
Authority
JP
Japan
Prior art keywords
speed
comparator
signal
voltage
main circuit
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
JP7508579A
Other languages
Japanese (ja)
Inventor
Isamu Hayakawa
Shizuo Nakano
Original Assignee
Shinko Electric 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 Shinko Electric Co Ltd filed Critical Shinko Electric Co Ltd
Priority to JP7508579A priority Critical patent/JPS55166487A/en
Publication of JPS55166487A publication Critical patent/JPS55166487A/en
Pending legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02HEMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00Emergency 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
    • H02H7/08Emergency 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
    • H02H7/093Emergency 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 increase beyond, or decrease below, a predetermined level of rotational speed

Abstract

PURPOSE:To make it possible to detect abnormality in a speed feedback signal system in a simple and purely electrical way by a method wherein a level detection of a speed feedback signal is combined with that of a main circuit motor terminal voltage or semiconductor power converter output voltage. CONSTITUTION:Abnormality in a speed feedback signal system is detected by an AND condition of an output of a voltage comparator 10 detecting that a motor terminal voltage is at a certain value or above and that of a speed comparator 11 sending a signal when a speed signal from a speed detector PG becomes a certain value or below, and also by an overspeed detecting signal of a speed comparator 14 to excite a main circuit breaking relay 13 to stop a main circuit. It is not possible for outputs A, B to be both 1 in the 4 sector operation, however, may be so in a mode change transition, and to prevent malfunction caused by it, a detecting sensitivity level of the speed comparator 11 is made sharper than that of the voltage comparator 10.
JP7508579A 1979-06-13 1979-06-13 Variable speed motor Pending JPS55166487A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7508579A JPS55166487A (en) 1979-06-13 1979-06-13 Variable speed motor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7508579A JPS55166487A (en) 1979-06-13 1979-06-13 Variable speed motor

Publications (1)

Publication Number Publication Date
JPS55166487A true JPS55166487A (en) 1980-12-25

Family

ID=13565978

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7508579A Pending JPS55166487A (en) 1979-06-13 1979-06-13 Variable speed motor

Country Status (1)

Country Link
JP (1) JPS55166487A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58131195U (en) * 1982-02-26 1983-09-05
JPS59165975A (en) * 1983-03-10 1984-09-19 Fuji Xerox Co Ltd Failure detector of encoder
JPS61149997U (en) * 1985-03-06 1986-09-16
JPS6310792U (en) * 1986-07-04 1988-01-23

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5091711A (en) * 1973-12-18 1975-07-22

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5091711A (en) * 1973-12-18 1975-07-22

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58131195U (en) * 1982-02-26 1983-09-05
JPH0119598Y2 (en) * 1982-02-26 1989-06-06
JPS59165975A (en) * 1983-03-10 1984-09-19 Fuji Xerox Co Ltd Failure detector of encoder
JPS61149997U (en) * 1985-03-06 1986-09-16
JPS6310792U (en) * 1986-07-04 1988-01-23

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