GB1337314A - Electrical circuit for dc excited magnetic systems - Google Patents

Electrical circuit for dc excited magnetic systems

Info

Publication number
GB1337314A
GB1337314A GB1337314DA GB1337314A GB 1337314 A GB1337314 A GB 1337314A GB 1337314D A GB1337314D A GB 1337314DA GB 1337314 A GB1337314 A GB 1337314A
Authority
GB
United Kingdom
Prior art keywords
current
coil
voltage
diode
initial
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
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.)
ELEKTROMASCHINENBAU VEB K
Original Assignee
ELEKTROMASCHINENBAU VEB K
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 ELEKTROMASCHINENBAU VEB K filed Critical ELEKTROMASCHINENBAU VEB K
Publication of GB1337314A publication Critical patent/GB1337314A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F7/00—Magnets
    • H01F7/06—Electromagnets; Actuators including electromagnets
    • H01F7/08—Electromagnets; Actuators including electromagnets with armatures
    • H01F7/18—Circuit arrangements for obtaining desired operating characteristics, e.g. for slow operation, for sequential energisation of windings, for high-speed energisation of windings
    • H01F7/1805—Circuit arrangements for holding the operation of electromagnets or for holding the armature in attracted position with reduced energising current
    • H01F7/1827—Circuit arrangements for holding the operation of electromagnets or for holding the armature in attracted position with reduced energising current by changing number of serially-connected turns or windings

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Hydraulic Clutches, Magnetic Clutches, Fluid Clutches, And Fluid Joints (AREA)

Abstract

1337314 Transistor switching circuits KOMBINAT ELEKTROMASCHINENBAU VEB 21 July 1971 34211/71 Heading H3T [Also in Division F2] A spring operated clutch or brake is released by an initial operating current in coil 1 which is at least 20 times the subsequent holding current in coils 1 and 2, the mean level of the initial current being increased by a "freewheeling" circuit D3 in parallel with coil 1, the resistance of D3 being lower than the coil 1 resistance under initial current conditions, and higher than it under hold current conditions. D3 is forward biased by the back e.m.f generated across coil 1 when each half cycle of current through the coil falls, and thus maintains a current in the same direction in the coil during the following negative half cycle. The induced e.m.f. and the diode voltage-current characteristic are selected to produce the higher resistance for D3 under hold current conditions in order to dissipate more rapidly the current when the coils are switched off. The hold current half cycles are supplied by D17 and the initial current half cycles by thyristor 6. Upon switch-on, D11 charges C13 during the first pulse of A.C. until a trigger diode 7 conducts due to a Zener 9 being biased on, and SCR 6 conducts to energize coil 1. During the next pulse through D11, the voltage across R15 takes longer to reach the Zener breakdown level since C13 is already partly charged, and so SCR6 conduction is made progressively later in each successive rectified A.C. pulse, until it stops conducting, and just the hold current from D17 flows. R16 is voltage dependent to make the number of pulses produced by SCR6 independent of the supply voltage level. D3 is a selenium diode and may be replaced by a Zener and silicon diode, or a voltage-dependent resistor and a silicon diode. The brakes or clutches are for use on elevating and conveying devices, and in machine tools and processing machines. The electromagnet system has two pot shaped cores with a variable air gap.
GB1337314D 1971-07-21 1971-07-21 Electrical circuit for dc excited magnetic systems Expired GB1337314A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3421171 1971-07-21

Publications (1)

Publication Number Publication Date
GB1337314A true GB1337314A (en) 1973-11-14

Family

ID=10362790

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1337314D Expired GB1337314A (en) 1971-07-21 1971-07-21 Electrical circuit for dc excited magnetic systems

Country Status (1)

Country Link
GB (1) GB1337314A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0251561A1 (en) * 1986-06-16 1988-01-07 Canon Kabushiki Kaisha Magnetic field generator
WO2009052934A1 (en) * 2007-10-23 2009-04-30 Honeywell Technologies Sarl Gas regulating unit
US10816335B2 (en) 2015-08-05 2020-10-27 Renishaw Plc Coordinate positioning machine

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0251561A1 (en) * 1986-06-16 1988-01-07 Canon Kabushiki Kaisha Magnetic field generator
WO2009052934A1 (en) * 2007-10-23 2009-04-30 Honeywell Technologies Sarl Gas regulating unit
US10816335B2 (en) 2015-08-05 2020-10-27 Renishaw Plc Coordinate positioning machine
US11300408B2 (en) 2015-08-05 2022-04-12 Renishaw Plc Coordinate positioning machine

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees