Electromagnetic Compatibility Studies of Selected Components for Present Day Cars

A present car includes more and more electronics. Today each car is stufied with integrated circuits. Some of them are responsible for correct operation of the engine, others watches over the security, and next ones else control equipment correcting comfort. However, from one hand the electronics in the cars brings the enormous advantage, from the other hand it is the cause of problems. These statements were the base to carry out measurements of emissivity for one of the elements flttings of a modern car. The systems and measurement stands as well as the results of radiated and conducted disturbance emissions have been shown in the article as the function of frequency for motors of car window wipers. 1. STRUCTURE OF THE WINDOW WIPER MOTOR DC electric motors are very often used execution elements within regulation systems. The primary advantages of these motors are: high torque, good e-ciency as well as small dimensions whereas the disadvantages are: sparking (industrial interferences) and wearing and tearing of commutator brushes. For last ten years a series of motors with a special design having very good dynamic charac- teristics have been introduced into the market. The primary disadvantage from EMC point of view is that sparking on the commutator generates plenty of electromagnetic interferences. A measure- ment methodology of conducted and radiated disturbances generated by the DC motor is presented later on in the article. The references connected with the topic of this article are (4,6,8,10{17).