For the activation of a magnet motor coil the transformer needs a three phase sinusoidal filter. It’s supposed to eliminate problems of strong EMC scattering around 1 MHz, which is caused by a clocked inverter. This should be done by a reduction of rise of voltage. The construction of the device has to be very individual, so it will be possible to adjust the critical frequencies very accurate by means of additional parts (resistors and capacitors). Simultaneously the layout should be very compact and touch-proof.
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