applications for chokes
norms DIN VDE 0570, DIN EN 61558, IEC 61558
electrical drive engineering
– input sided line choke for rectifiers or frequency converters with or without energetic recovery system increase the life-time of downstream components; commutator choke; intermediate circuit choke; smoothing choke for DC-drives; balance choke; base load choke; motor choke at the inverter output to attenuate the steep voltage (du/dt) to e.g. < 50 V/µ protects the motor winding isolation and reduces disturbance; motor choke related to condensators as L-C-filters or sinusoidal filters for an improved output signal additionally reduces frequency noise, spares screened motor feed lines, enables longer linse and improves EMC; equal frequency choke at the inverter output reduces common-mode-current over the engine brackets against earth (ball bearing wearout,
see also IEC 60034-25) in easiest case as toroidal core over the power output.
audiotechnology – rod core choke for frequency turnout; filter reactor; balance choke
railway technology - air chokes are used in railway technology and in electric power transformation substations to smooth high voltage peaks. Air chokes don’t switch to saturation when overloaded.
reactance compensation unit
– three-phase filter circuit choke constructed for various claimed filtering factors p resp. resonance frequencies ( fres = fline *
), with small inductance tolerance, linear far
over In, for the tensile loading safety of condensator batteries, resulting from harmonics in lines, above all with current reactor tension, altogether main impedance is increased.
EMC / suppression of interference – RFI-choke, rod core chokes for line input; current compensated choke/filter choke (mostly a toroidal core of iron powder- or ferrite materials) to assembly interference suppresion switches; line choke with sheets to attenuate current harmonics, protective conductor choke according to VDE 0565 / EN 60938-1
power electronics – series choke e.g. for current limitation, storage choke
(magn. energy W = ½ * L * I² ); PFC-choke for an increasement of power factor for switch power supplies (DIN EN 61000-3-2); filter reactor, resonance- and transduction choke for clocked batteries, resonance
transformer etc.; ballast choke; two-phase intermediate circuit choke for reduction of harmonics; thyristor choke; symmetric choke; saturable choke
communications engineering – intermediate frequency- and HF- choke
test equipment – one- or three-phase load- and reactance choke
switchboards – one- or three-phase line choke with serious connection to achieve 4% short-circuit current to line, which is claimed of EVU; limitation of start-up or current-inrush; attenuation of current harmonics conform to DIN EN 61000-3-2 (passive PFC) over all in units with rectifiers resp. DC link (inverter); balance choke; locking choke; reactance choke
welding equipment – inverter loading choke; intermediate circuit choke; line choke; suppressor choke; commutating choke
solar technology - pot core chokes are used to smooth high frequency ripples (e.g. 25kHz) for inverters of solar technology
Further terms to this topic:
start-up current, commutation, idle current, iron core choke, harmonics, electrical engine, idle current compensation, motor choke, air choke, rod core choke, energy content
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