Throttles

Transformatorenwerk Breimer-Roth GmbH produces single-phase and three-phase chokes. These can be designed as mains chokes, filter circuit chokes, sinusoidal filter chokes, commutation chokes, motor chokes, smoothing chokes, AC and DC chokes.

A choke, also known as a choke coil, coil (air or iron coil), is a passive component used in electrical engineering. In most cases, a choke has only one winding (per phase). It can be designed as an air-core coil or with a ferromagnetic iron core. Air-core coils are largely linear in terms of inductance, whereas coils with an iron core usually require the characteristic curve to be linearized by means of an inserted air gap (shear).
Chokes for power applications can be divided into alternating voltage chokes (AC chokes) and chokes for direct current circuits (DC chokes).

AC chokes can have a 1-phase or 3-phase design. As a rule, these are chokes with ferromagnetic cores, with or without air gaps. DC chokes can be designed as air coils or with iron cores.

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

THROTTLES – OVERVIEW OF THE PRODUCT RANGE

BEND 4
Single-phase mains chokes 4%
2 – 32 A

BEND 6
Single-phase mains chokes 6%
2 – 32 A

BENDD 4
Single-phase mains double choke 4%
2 – 32 A

BENDD 6
Single-phase mains double choke 6%
2 – 32 A

BEFD 5.5
Single-phase filter choke 5.5% (214Hz)
8 – 90 µF

BDFD 7
Three-phase filter choke 7% (189Hz)
2.5 – 50 kVAR

BDFD 14
Three-phase filter choke 14% (134Hz)
3.1 – 50 kVAR

BDND 4
Three-phase mains choke 4%
2 – 500 A

BDND 6
Three-phase mains choke 6%
2 – 500 A

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Construction of transformers - Breimer-Roth

Use of chokes

Chokes are inductive components in the field of electronics. They are mainly used in the power supply of electrical devices or systems, in power electronics and 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 so-called self-induction and can therefore be used in various areas of electrical engineering. Chokes can therefore be used for damping, radio interference suppression, commutation, current limiting, suppression of unwanted frequencies or for energy storage in switching regulators and switching power supplies.
The special mains choke is connected between the supply network and the frequency inverter in order to smooth out current peaks (current-compensated choke) caused by the current consumption of the inverter. This brings the waveform of the mains current closer to the sinusoidal curve again and there is less mains feedback. In addition, mains interference in the direction of the frequency inverter is attenuated. Mains chokes can be manufactured as single-phase and three-phase mains chokes. In contrast to transformers, which convert voltages, the mains choke is an inductive resistor that dampens voltages.
A mains choke reduces voltage dips in the mains voltage caused by the commutation process and prevents inadmissible stress on the semiconductors due to an excessive increase in current. The current ripple is also smoothed out.
Mains chokes are used for both single-phase and three-phase networks. Mains chokes are used as EMC filters for regenerative converters. The use of the choke decouples the mains from the frequency inverter and reduces the THD value (total harmonic distortion).
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Do you have any questions or need technical information? Get in touch with us. For specific inquiries, you can also use our detailed inquiry form.