CHOKES

The transformer factory Breimer-Roth GmbH manufactures single-phase and three-phase chokes. These can be designed as network chokes, filter circuit chokes, sine filter chokes, commutation chokes, motor chokes, smoothing chokes, and alternating and direct current chokes.

A choke, also referred to as an inductance coil or inductor (air or iron-core coil), is a passive component in electrical engineering. Most chokes have only one winding (per phase). They can be made as air-core coils or with a ferromagnetic iron core. Air-core coils are generally linear in terms of inductance, while coils with iron cores typically require the characteristic curve to be linearized by inserting an air gap (shearing effect).

Chokes for power applications can be divided into alternating current (AC) chokes and direct current (DC) chokes.

AC chokes can be single-phase or three-phase. These are usually inductance coils with ferromagnetic cores, with or without an air gap. DC chokes can be designed as air-core coils or with iron cores.

The key characteristic of a choke coil is its inductance, which must be designed for the expected continuous and peak currents. Instead of an inductance value, a voltage drop at rated current can also be specified.

CHOKES – PRODUCT RANGE OVERVIEW

BEND 4
Single Phase Power Line Choke 4%
2 – 32 A

BEND 6
Single Phase Power Line Choke 6%
2 – 32 A

BENDD 4
Single Phase Line Choke 4%
2 – 32 A

BENDD 6
Single Phase Line Choke 6%
2 – 32 A

BEFD 5,5
Single-Phase Filter Choke 5.5% (214 hz)
8 – 90 µF

BDFD 7
Three-Phase Filter Chokes 7%
2,5 – 50 kVAR

BDFD 14
Three-Phase Filter Chokes 14%
3,1 – 50 kVAR

BDND 4
Three Phase Power Line Choke 4%
2 – 500 A

BDND 6
Three Phase Power Line Chokes 6%
2 – 500 A

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Application of chokes

Chokes are inductive components in the field of electrical engineering. They are mainly used in the field of power supply of electrical devices or systems, in power electronics as well as in low and high frequency technology. Line chokes consist of at least one winding of a current conductor through which the full load current flows. The winding is usually wound on a coil carrier and consists of a soft magnetic core. Chokes work with the so-called self-induction and can therefore be used in various areas of electrical engineering. Chokes can thus be used for suppression, radio interference suppression, commutation, current limiting, suppression of unwanted frequencies or for energy storage in switching regulators and switching power supplies.

The Special Line Choke is connected between the supply network and the frequency converter to smooth current peaks (current-compensated choke) caused by the current consumption of the converter. As a result, the waveform of the mains current becomes closer to the sinusoidal curve again and there are fewer mains disturbances. In addition, mains interference in the direction of the frequency inverter is attenuated. Line Chokes can be manufactured as Single-Phase and Three-Phase Line Chokes. In contrast to transformers, which convert voltages, the line choke is an inductive resistor, which dampens voltages.

A Line Choke reduces voltage dips in the line voltage caused by the commutation process and prevents undue stress on semiconductors caused by excessive current rise. The current ripple is also smoothed.

Mains Chokes are used for the single-phase as well as for the three-phase mains. For regenerative converters, line chokes are used as EMC filters. In this case, the use of the choke decouples the mains from the frequency inverter and reduces the THD value (Total Harmonic Distortion).
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