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The magnetic field generated by electric vehicles are the subject of public concern. Preliminary spot measurement results confirm that electric vehicles generate transient magnetic fields which may be quantified with appropriate instrumentation. The magnetic fields created by the electric vehicle in different running and charging modes also shows the presence of high frequency components. This paper documents the preliminary measurements.

This paper briefly describes electric vehicle (EV) magnetic field measurement and evaluation techniques, and compares ac magnetic field results from different electric vehicles (EV). The survey includes nine vehicles from different U.S. manufacturers. These vehicles are powered by either ac or dc motors. Measurement results show that the highest field is generated during regenerative braking and maximum acceleration. Inside the vehicle, the highest field is measured on the driver's seat. Results of measurements also show the importance of shielding the ac magnetic field.