Appendix A Trouble-free Use of Inverters (Notes on Electrical Noise)
Appendix-3
[ 2 ] Types of noise
Noise generated in an inverter is propagated through the main circuit wiring to the power supply and the motor so
as to affect a wide range of applications from the power supply transformer to the motor. The various propagation
routes are shown in Fig. A.2-2. According to those routes, noises are roughly classified into three types:
(1) to (3) are conducted noise, (4) is induction noise, and (5) is radiated noise. Details are given below.
Fig. A.2-2 Noise propagation routes
(1) Conducted noise
The noise that has occurred in the inverter and propagates through a conductor to influence peripheral equipment
is called conducted noise. Some conducted noise will propagate through the main circuit (1). If the ground wires
are connected to a common ground, conducted noise will propagate through route (2). As shown in route (3), some
conducted noise will propagate through signal lines or shielded wires.
Fig. A.2-3 Conducted noise
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