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Posted on 01/07/2022 in Business

Increased Use of Magnets in The Automotive Industry

Increased Use of Magnets in The Automotive Industry

The complexity of car electrical control systems has increased significantly as automobile manufacturers respond to the requirement to build vehicles that use less fuel, emit less pollution, and are smarter. This has raised the need for powerful automotive magnets, which are used in the manufacture of vehicle actuators and motors. Consequently, the need for rare earth metals to produce compact and powerful samarium cobalt (SmCo) and neodymium magnets (NdFeB), which can be concocted with complex shapes and geometries, has multiplied.


The need for one automobile solution has propelled the growth of advanced automotive magnets.

Over the last few decades, vehicle control systems have shifted from mechanical, pneumatic, and hydraulic control to electrical control. As a result, the need for magnets used in motors, sensors, actuators, and suspension systems to improve vehicle control systems has increased. Among these applications are:

  • Motors: windscreen wipers, Fans, starters, alternators, power steering, seat motors and drive motors.

  • Sensors: Airbags, ABS speed sensors, position sensors, seat belts sensors, and engine control sensors.

  • Actuators: Brakes, Fuel injectors, vents, cruise control, doors, and suspension.

There are hundreds of magnets in automobiles. Other reasons that have led to the growing demand for automotive magnets include greater vehicle complexity, the trend toward vehicle autonomy, and the shift toward hybrid and electric cars.


Although standardferrite magnets are still widely used, the demand for small high-performance magnets has raised the demand for vehicle magnets. These include neodymium magnets, samarium magnets, Alnico magnets (aluminum-nickel-cobalt magnets), and plastic bonded magnets. Even though these new magnetic materials are strong, many of them are temperature sensitive. The most powerful neodymium magnets, for example, consisting of neodymium, iron, and boron alloy, lose their magnetic at 80 °C. However, by modifying the alloy composition, the maximum magnet working temperature may be increased to around 250°C, but at the expense of magnetic strength.

Sintering, casting, and molding with plastic fillers are all methods employed in magnet manufacturing. The technique of production selected is determined by the eventual application of the magnet, which includes:

  1. Cost

  2. Temperature

  3. Field strength

  4. Shape

Sintering is commonly used to create high-power neodymium and samarium magnets. The components are melted in a furnace, cast, and ground into a fine powder. Using presses, the powder is crushed into the desired form. Finally, the magnets are sintered and magnetized in a special vacuum furnace. It should be noted that neodymium magnets, and to a lesser extent samarium magnets, are corrosive and require a protective coating. Other procedures employed in magnet manufacturing include traditional casting techniques and magnet encapsulation in plastic materials.

The automobile industry continues to require new and improved magnets for cars capable of excellent performance in adverse situations. This is encouraging research into improved methods of creating high-performance magnets for the car sector. In terms of technical innovation, manufacturing competence, and efficiency, IMA is a market leader. Contact us to learn more about how we can assist you.


Posted by Chandar Shekhawat
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