No danger from magnetic fields in electric cars

May 1, 2014 - 06:50
Article from Gemini, SINTEF

Have you ever been concerned that electric cars produce dangerous magnetic fields? Worry no more, because research shows that this is not the case.

Magnetic fields in electric cars are well below the limiting values, according to a comprehensive study. (Illustration: Geir Mogen/SINTEF)

Researchers from seven countries have concluded that we can feel safe both in electric-powered cars and in those powered by hydrogen, petrol and diesel. At least when it comes to magnetic fields.

It turns out that none of them exposes passengers to higher electromagnetic fields than those recommended in international standards. In fact, field intensity is well below the recommended value.

The study is currently the most comprehensive ever carried out in this field.

Magnetic fields – a public concern

SINTEF has led and participated in the research project, involving nine other European companies and research institutes.

“There is a good deal of public concern about exposure to magnetic fields. The subject crops up regularly in the media. With the number of electric-powered vehicles increasing, this project is very relevant,” says Kari Schjølberg-Henriksen, a physicist at SINTEF.

In addition to improving the public’s confidence when it comes to magnetic fields in electric cars, the goal of this project was primarily to create a standardised method for measuring electromagnetic fields in such vehicles.

The International Commission on Non-Ionising Radiation Protection (ICNIRP) defines the limiting values of acceptable exposure to magnetic fields at different frequencies.

Tests on eleven types of car

The intensity of magnetic fields in seven different electric cars, one hydrogen car and one petrol car were measured in order to ascertain whether they approach the recommended limiting values for human exposure.

The measurements were carried out using real cars in a laboratory and during road tests.

The highest values in electric cars were measured near the floor, close to the battery itself and when starting the cars. In all cases, exposure to magnetic fields is lower than 20 percent of the limiting value recommended by the ICNIRP. Measurements taken at head-height are less than 2 percent of the same limiting value.

In the case of petrol and diesel powered cars, exposure was measured at around 10 percent of the limiting value.

In other words, there is little difference between electric cars and petrol and diesel cars.

Hence the conclusion is that magnetic fields in electric cars are well below the limiting values, and that there is a good safety margin.

No cause for concern

“There is absolutely no cause for concern. The difference between this research and similar earlier work, is that we have taken into account what contributes to the magnetic fields,” Schjølberg-Henriksen says.

“The rotation of the wheels themselves generates considerable magnetic fields, irrespective of vehicle type,” she points out.

The EU-funded research project EM Safety is the most comprehensive study yet carried out to identify different sources of magnetic fields in electric cars. Seven countries have been involved in the project, in which universities, the car industry, research institutions and laboratories are represented.

Country
Partner profile
Gemini, SINTEF
SINTEF is a broadly based, multidisciplinary research concern with international expertise in technology, medicine and the social sciences. Read more

Jobs

Follow ScienceNordic on

What others are reading