Ceramic distributor rotor for electromagnetic interference (EMI) control
by A.L. Micheli, W.-C. Kuo, R.L. Spraguet
International Journal of Vehicle Design (IJVD), Vol. 6, No. 6, 1985

Abstract: Experimental studies indicate that current variations near the distributor gap are a good indicator of electromagnetic radiation (EMR) for frequencies exceeding 100 MHz. After the distributor gap breaks down, the current trace measured near the gap shows two major peaks: one when the initial process bridges the gap (streamer pulse with peak value I₁), and the other when the spark finally occurs. The value of I₁ can be related to the breakdown voltage by a relation similar to that in a corona discharge. The magnitude of I₁ is a good indicator of EMR due to the distributor gap. I₁ can be effectively suppressed by a resistive load located right at the distributor gap. For improvements of electromagnetic interference (EMI) control over current production distributor rotors, a resistive ceramic rotor composed of iron oxide doped with titania satisfies the electrical and mechanical requirements for the ignition system. Also, the ceramic rotor was found to improve in-car radio noise suppression. Tests on ceramic rotors installed in GM vehicles show satisfactory radio performance.

Online publication date: Sun, 25-May-2014

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