JPS57138844A - Controlling device for dc motor - Google Patents

Controlling device for dc motor

Info

Publication number
JPS57138844A
JPS57138844A JP56024522A JP2452281A JPS57138844A JP S57138844 A JPS57138844 A JP S57138844A JP 56024522 A JP56024522 A JP 56024522A JP 2452281 A JP2452281 A JP 2452281A JP S57138844 A JPS57138844 A JP S57138844A
Authority
JP
Japan
Prior art keywords
motor
measuring
resistance
comparator
armature
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
JP56024522A
Other languages
Japanese (ja)
Inventor
Kinya Hirata
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.)
Okuma Corp
Original Assignee
Okuma Tekkosho KK
Okuma Machinery Works 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 Okuma Tekkosho KK, Okuma Machinery Works Ltd filed Critical Okuma Tekkosho KK
Priority to JP56024522A priority Critical patent/JPS57138844A/en
Publication of JPS57138844A publication Critical patent/JPS57138844A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/34—Testing dynamo-electric machines

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Control Of Direct Current Motors (AREA)

Abstract

PURPOSE:To prevent a damage caused by the deterioration in the insulation of a brush due to the accumulation of worn powder of the brush by providing a normally measuring and monitoring circuit for the insulating resistance of a motor. CONSTITUTION:An insulating resistance measuring circuit 20 has an insulating resistance measuring instrument 22 for measuring leakage current, a comparator 23 for producing an air blow alarm signal, and a comparator 24 for producing an armature current zero signal, thereby always measuring the resistance between the armature and the ground (the case of a DC motor) of a DC motor 17. When the resistance value becomes lower than the predetermined value, an armature current zero command is outputted, thereby stopping the motor 17.
JP56024522A 1981-02-20 1981-02-20 Controlling device for dc motor Pending JPS57138844A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56024522A JPS57138844A (en) 1981-02-20 1981-02-20 Controlling device for dc motor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56024522A JPS57138844A (en) 1981-02-20 1981-02-20 Controlling device for dc motor

Publications (1)

Publication Number Publication Date
JPS57138844A true JPS57138844A (en) 1982-08-27

Family

ID=12140490

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56024522A Pending JPS57138844A (en) 1981-02-20 1981-02-20 Controlling device for dc motor

Country Status (1)

Country Link
JP (1) JPS57138844A (en)

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