GB657380A - Feeding means for scrap steel electro-magnets - Google Patents

Feeding means for scrap steel electro-magnets

Info

Publication number
GB657380A
GB657380A GB4458/49A GB445849A GB657380A GB 657380 A GB657380 A GB 657380A GB 4458/49 A GB4458/49 A GB 4458/49A GB 445849 A GB445849 A GB 445849A GB 657380 A GB657380 A GB 657380A
Authority
GB
United Kingdom
Prior art keywords
winding
magnet
shunt
current
generator
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
GB4458/49A
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.)
ABB Norden Holding AB
Original Assignee
ASEA AB
Allmanna Svenska Elektriska AB
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 ASEA AB, Allmanna Svenska Elektriska AB filed Critical ASEA AB
Publication of GB657380A publication Critical patent/GB657380A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K23/00—DC commutator motors or generators having mechanical commutator; Universal AC/DC commutator motors
    • H02K23/02—DC commutator motors or generators having mechanical commutator; Universal AC/DC commutator motors characterised by arrangement for exciting

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Load-Engaging Elements For Cranes (AREA)

Abstract

657,380. Control systems for electromagnets; exciting dynamo-electric machines. ALLMANNA SVENSKA ELEKTRISKA AKTIEBOLAGET. Feb. 18, 1949, No. 4458. Convention date, March 13, 1948. [Classes 35 and 38 (iv)] In a control system to operate lifting electro. magnets, each magnet 1 is supplied from a D.C- generator 2 having three field windings, viz., a shunt winding a, a series winding c in opposition to the shunt winding and a separately fed winding b helping the shunt winding, the magnetization and the demagnetization of the magnet 1 being attained by the switching " on " or " off " of the current in the winding b. The magnitude of the current fed to the magnet is maintained constant irrespective of the thermal condition of its winding by arranging the shunt winding a so that the resistance line coincides with the straight part of the magnetization curve of the generator. When a push-button 5 is actuated a resistance 6 is put in series with the winding b, the current in the magnet drops down with the result that scrap loosely attracted by the magnet will be dropped and when the switch 4 is open, so that no current flows in the winding b, the P.D. of the generator rapidly decreases because the M.M.F. of the winding c preponderates over that of the shunt winding a and will even cause a reversal of polarity causing immediate dropping of the remaining attracted scrap. With the switch 4 closed and the resistance 6 shorted by the push-button 5 the combined M.M.F.'s of winding a and b preponderate over that of c and a steady predetermined value of current flows to energize the magnet 1:
GB4458/49A 1948-03-13 1949-02-18 Feeding means for scrap steel electro-magnets Expired GB657380A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE657380X 1948-03-13

Publications (1)

Publication Number Publication Date
GB657380A true GB657380A (en) 1951-09-19

Family

ID=20314212

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4458/49A Expired GB657380A (en) 1948-03-13 1949-02-18 Feeding means for scrap steel electro-magnets

Country Status (1)

Country Link
GB (1) GB657380A (en)

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