GB543683A - Improvements in or relating to permanent magnets for electrical measuring instruments - Google Patents

Improvements in or relating to permanent magnets for electrical measuring instruments

Info

Publication number
GB543683A
GB543683A GB15431/40A GB1543140A GB543683A GB 543683 A GB543683 A GB 543683A GB 15431/40 A GB15431/40 A GB 15431/40A GB 1543140 A GB1543140 A GB 1543140A GB 543683 A GB543683 A GB 543683A
Authority
GB
United Kingdom
Prior art keywords
magnet
permanent magnets
plating
coating
thousandths
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.)
Expired
Application number
GB15431/40A
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.)
Westinghouse Electric International Co
Original Assignee
Westinghouse Electric International Co
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 Westinghouse Electric International Co filed Critical Westinghouse Electric International Co
Publication of GB543683A publication Critical patent/GB543683A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R11/00—Electromechanical arrangements for measuring time integral of electric power or current, e.g. of consumption
    • G01R11/02—Constructional details
    • G01R11/10—Braking magnets; Damping arrangements

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Hard Magnetic Materials (AREA)
  • Permanent Field Magnets Of Synchronous Machinery (AREA)

Abstract

543,683. Permanent magnets. WESTING- HOUSE ELECTRIC INTERNATIONAL CO. Oct. 18, 1940, No. 15431. Convention date, Nov. 4, 1939. Drawings to Specification. [Class 35] A permanent magnet, suitable for the brake magnet of an induction-motor meter, is shielded against fluctuating magnetic fields by a coating of conductive material, such as copper, applied by electrodeposition, the coating being at least onethousandth of an inch thick, for example between seven and twenty-thousandths, and preferably averaging fifteen thousandths. The formed magnet is cleaned and dipped in sulphuric or hydrochloric acid before plating. If the latter operation is carried out for several hours at a temperature of 175‹ F, the magnet is aged at the same time. The pole tips may or may not be covered with a deposit, and in the latter case a layer of resistant material such as rubber, wax or asphalt, is placed over them during plating and subsequently removed. Silver also is referred to as plating material.
GB15431/40A 1939-11-04 1940-10-18 Improvements in or relating to permanent magnets for electrical measuring instruments Expired GB543683A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US543683XA 1939-11-04 1939-11-04

Publications (1)

Publication Number Publication Date
GB543683A true GB543683A (en) 1942-03-09

Family

ID=21990548

Family Applications (1)

Application Number Title Priority Date Filing Date
GB15431/40A Expired GB543683A (en) 1939-11-04 1940-10-18 Improvements in or relating to permanent magnets for electrical measuring instruments

Country Status (1)

Country Link
GB (1) GB543683A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2422986A (en) * 1944-05-10 1947-06-24 Gen Electric Time delay relay

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2422986A (en) * 1944-05-10 1947-06-24 Gen Electric Time delay relay

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