JPS6422478A - Device for controlling demagnetization - Google Patents

Device for controlling demagnetization

Info

Publication number
JPS6422478A
JPS6422478A JP17976287A JP17976287A JPS6422478A JP S6422478 A JPS6422478 A JP S6422478A JP 17976287 A JP17976287 A JP 17976287A JP 17976287 A JP17976287 A JP 17976287A JP S6422478 A JPS6422478 A JP S6422478A
Authority
JP
Japan
Prior art keywords
current
gradually
firing angle
residual magnetism
phase
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
JP17976287A
Other languages
Japanese (ja)
Other versions
JPH0749157B2 (en
Inventor
Katsuo Yoshimura
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.)
Dengensha Toa Co Ltd
Original Assignee
Dengensha Manufacturing 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 Dengensha Manufacturing Co Ltd filed Critical Dengensha Manufacturing Co Ltd
Priority to JP62179762A priority Critical patent/JPH0749157B2/en
Publication of JPS6422478A publication Critical patent/JPS6422478A/en
Publication of JPH0749157B2 publication Critical patent/JPH0749157B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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  • Arc Welding Control (AREA)

Abstract

PURPOSE:To eliminate the residual magnetism without using a demagnetizer by decreasing an electric current gradually by the phase control by using a welding machine after the main electrification required for the welding is finished. CONSTITUTION:When a firing angle alpha of the phase control is enlarged gradually from alpha1 to alpha2, the current B' decreases gradually to the current C'. When a magnetic hysteresis loop (D) of a work takes place by the firing angle alpha1, the magnetic hysteresis loop of the work deceases gradually like (E) by the firing angle alpha2 and when said loop deceases, the residual magnetism also decreases. When a final value of the firing angle alpha of the phase control of the dwindling current is in the range of 150-180 deg., the residual magnetism <=10 gauss without hindrance practically can be attained. Accordingly, a phase shifter consisting of a resistance R0 and a capacitor C0 is provided at the primary side of a transformer TR1 of a current control circuit and even when the phase of a main power source is made to 180 deg., a main thyristor is ignited.
JP62179762A 1987-07-18 1987-07-18 Demagnetization control device Expired - Lifetime JPH0749157B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62179762A JPH0749157B2 (en) 1987-07-18 1987-07-18 Demagnetization control device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62179762A JPH0749157B2 (en) 1987-07-18 1987-07-18 Demagnetization control device

Publications (2)

Publication Number Publication Date
JPS6422478A true JPS6422478A (en) 1989-01-25
JPH0749157B2 JPH0749157B2 (en) 1995-05-31

Family

ID=16071440

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62179762A Expired - Lifetime JPH0749157B2 (en) 1987-07-18 1987-07-18 Demagnetization control device

Country Status (1)

Country Link
JP (1) JPH0749157B2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6124136B2 (en) * 2013-08-30 2017-05-10 パナソニックＩｐマネジメント株式会社 Non-contact power receiving device

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS492822U (en) * 1972-04-15 1974-01-11
JPS51101752A (en) * 1976-02-16 1976-09-08 Dengensha Mfg Co Ltd TEIKOYOSETSUKISEIGYOHOHO
JPS6043233A (en) * 1983-08-18 1985-03-07 Matsushita Electric Ind Co Ltd Detector for focusing and tracking signal

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS492822U (en) * 1972-04-15 1974-01-11
JPS51101752A (en) * 1976-02-16 1976-09-08 Dengensha Mfg Co Ltd TEIKOYOSETSUKISEIGYOHOHO
JPS6043233A (en) * 1983-08-18 1985-03-07 Matsushita Electric Ind Co Ltd Detector for focusing and tracking signal

Also Published As

Publication number Publication date
JPH0749157B2 (en) 1995-05-31

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