Chokes handle up to 3kA gigaHertz-range frequencies

SMP Sintermetalle Prometheus GmbH & Co KG (SMP) offers chokes for medical technology applications. These inductive components are used in Magnetic Resonance Imaging (MRI) or Computed Tomography (CT), for example. Designed as filter or mains chokes they are not only compact, low-loss, and energy-efficient but also exceptionally quiet in operation – essential qualities for demanding medical technology applications.

In MRI scanners, the components are installed in the “gradient amplifiers”, which supply output voltages and currents and control the gradient coils that encode the resonance signals for subsequent image reconstruction. The filter and mains chokes are designed to ensure a clean sinusoidal waveform and low-loss feedback of the unused energy.

Special magnetostriction-free materials, which SMP develops and produces according to individual customer specifications, ensure that components run very quietly. The powder composite materials feature low eddy current and magnetic reversal losses. The components are noted for their low loss balances and optimal EMC properties. They are also maintenance-free. The three-dimensional isotropy of the materials enables compact, lightweight structures because the magnetic circuits are minimized. This also lowers the magnetic field strength, and the quantity of winding material used can be significantly reduced. The materials have a high saturation induction of up to 2 Tesla. The oscillation behavior of the choke can be adjusted specifically by using certain materials or appropriate, magnetically coupled designs with multiple coils.

SMP components are designed for currents of up to 3000 A and for frequencies up to the gigaHertz range. The components can be produced with dimensions from 19 mm to 300 mm and weights from 0.05 kg to 130 kg. All components are RoHS and REACH compliant and CE and EAC certified, and the materials used are UL-listed.

Besides medical technology, the filter systems and inductive components are used in industrial applications in the power electronics, automation, and signal processing sectors, in drive applications for railway engineering, electromobility, and marine engineering, in renewable energies and power supply, and in the aerospace industry.

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