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Depending on their place of use, all electrical equipment must meet certain limit values with respect to emitted interference as well as susceptibility to interference. These are regulated in the EMC guidelines and EMC standards, such as DIN EN 55011:2018-05 for equipment in industry, science and medicine (ISM equipment).
We use our NANOPERM material for toroidal cores and chokes that absorb interference on the mains side. In the process, the components convert the interference into heat so that no additional leakage current is formed. Often, this interference suppression is not sufficient and mains filters with a combination of chokes and capacitors, such as LC filters, have to be used. When sizing and designing the cores, we work closely with our partners and clients in order to find solutions that are optimized in terms of costs and benefits.
If transformers are operated for SMPS applications in the kHz range or higher, for example, core materials such as grain-oriented iron-silicon alloys are not suitable due to their high eddy current losses. NANOPERM materials, by contrast, not only have low losses due to a flat hysteresis curve, but also can be used with great stability over a wide temperature range. The high saturation induction of 1.2 T roughly corresponds to three times the value of ferrites. The use of NANOPERM toroidal cores allows the realization of a high degree of effectiveness in a small installation space. In addition, with even distribution of the windings, the stray fields are practically zero due to the typical permeability values of 90,000 at 10 kHz. As a result, power transformers with NANOPERM cores are in particular very well suited to use in frequency converters with SiC and GaN semi-conductors.
Influence on the System of Radiated Interference
According to the definition, radiated interference is interference that occurs in the frequency range of > 30 MHz, below that, we talk about line-conducted interference. The requirement and demand for frequency converters (FC) with increasingly higher performance and greater switching frequencies is also increasingly the generation of electrical interference that occurs in the FC during switching operations. This interference spreads both via the motor cables and the motor shield. In the case of frequencies in the MHz range, they act as antennae and the intereference is emitted into the surrounding area.
This emitted interference is not only often outside the statutory limits but can also lead to malfunctions in own and external systems. This can have devastating consequences, both in the constantly growing field of electromobility as well as in renewable energies, specifically wind power, and in Industry 4.0. Possible impacts range from individual outages, through complete belt shutdowns right up to risks to people. With the help of MAGNETEC CoolTube® cores, which have been specifically designed to absorb high-frequency interference, these impacts can be reduced to a degree of disruption-free operation.
We support you in choosing the right products, offer to carry out on-site measurements together with you and define suitable corrective measures. We are happy to help you in person in identifying and measuring interference and in the expert design of the right EMC components. In addition to the simple and maintenance-free installation, a key advantage of the use of NANOPERM toroidal cores is above all the absorption of interference, in other words the conversion of the energy into heat. The interference is thus effectively reduced and not moved to other (frequency) ranges, meaning that disruption-free operation can be guaranteed.
Influence on the System of Line-Conducted Interference
According to the definition, line-conducted interference is interference in the range between 150 kHz and 30 MHz, above this, it is radiated interference. The requirement and demand for frequency converters (FC) with increasingly higher performance and greater switching frequencies is also increasingly the generation of electrical interference that occurs in the FC during switching operations. This line-conducted interference can be split into two categories: Differential Mode (DM) and Common Mode (CM). This interference can spread within a system (for example, in an electric car) via the electrical wires and damage sensitive components, such as the microcontrollers (ICs). Furthermore, the resulting surges at the controlling ports can cause malfunctions and are thus a considerable safety risk to equipment and people.
There is a risk that control units will no longer work properly or, in the worst case, fail completely.
MAGNETEC produces and supplies the components required to absorb in interference that occurs. We are happy to offer you our expert help and expertise for detecting combating/reducing/suppressing interference!
MR Range as Alternatives to Ferrit Cores
MAGNETEC produces nanocrystalline toroidal cores made of NANOPERM that can substitute ferrites for interference suppression applications 1:1 from a size of 56mm. The soft magnetic cores made of the new NANOPERM MR range are mechanically compatible with the standard ferrite design. they offer significant advantages with respect to inductivity, core losses and the impedance curve. For this reason, there is no need for an expensive redevelopment of the existing application and the current design rules for ferrites can still be used.
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