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Low frequency magnetic fields induced by car tire magnetization.
Stefan Stankowski1, Andreas Kessi, Olivier Bécheiraz
1Berne University of Applied Sciences at Biel, Quellgasse 21, CH-2500 Biel, Switzerland. stefan.stankowski@bfh.ch
Health Physics
|January 13, 2006
Summary
Magnetized tires are the primary source of alternating magnetic fields in cars, reaching up to 100 microtesla. Demagnetizing tires significantly reduces these fields during normal use.
Area of Science:
- Electromagnetism
- Automotive Engineering
Background:
- Alternating magnetic fields are present in vehicles.
- The dominant source of these fields is magnetized tires.
Purpose of the Study:
- To measure magnetic field strengths in cars.
- To identify the primary source of these fields.
- To investigate the effect of tire magnetization on field strength.
Main Methods:
- Magnetic field measurements were taken at tire locations and various interior car positions.
- Measurements were conducted as a function of frequency (10-200 Hz).
- Tire magnetization was intentionally altered to study parameter influence.
Main Results:
- Field strengths up to 100 microtesla (µT) were measured directly at tires.
- Interior car measurements revealed field strengths of several µT in foot and back seat regions.
- Measured field values in some cases exceeded those from previous studies.
- Degaussed tires maintained low field values during normal operation.
Conclusions:
- Magnetized tires are the main contributors to alternating magnetic fields within cars.
- Tire magnetization is a key factor influencing magnetic field exposure.
- Demagnetizing tires is an effective method for reducing magnetic field levels in vehicles.