Commutator motors as EMI sources

Electromagnetic interference (EMI) is dual-sided problem in electrical engineering because electric appliances can be on one hand very sensitive, but unintentional receptors, and on another hand they can be entirely unintentional transmitters or even both of them in one. The transmitters being in the receptors neighbourhood constitute electromagnetic environment. To design the electromagnetic compatible appliances means firstly that the designed appliances do not excessively pollute the electromagnetic environment, and secondly that these appliances are not vulnerable receptors of disturbances from this environment. Commutator motors are the EMI sources, and are worth to be carefully considered how to be improved due to their EMI emission.