Appendix A Trouble-free Use of Inverters (Notes on Electrical Noise)
Appendix-4
(2) Induction noise
When wires or signal lines of peripheral devices are brought close to the wires on the input and output sides of the
inverter through which noise current is flowing, noise will be induced into those wires and signal lines of the devices
by electromagnetic induction (Fig. A.2-4) or electrostatic induction (Fig. A.2-5). This is called “induction noise” (4).
Fig. A.2-4 Electromagnetic induction noise
Fig. A.2-5 Electrostatic induction noise
(3) Radiated noise
Noise generated in an inverter radiates through the air with input side and output side main circuit wires, and ground
wires acting as antennas, and this affects peripheral devices, as well as broadcast and wireless communication.
This noise is called “radiated noise” as shown below as (5). Not only wires but motor frames or control system
panels containing inverters may also act as antennas.
Fig. A.2-6 Radiated noise
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