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New EV system features electric motor inside wheels

The technology enhances power efficiency and performance by reducing drive system components and controlling of all wheels independently

Seoul, South Korea—Hyundai Mobis has announced it has succeeded in developing the in-wheel system, which lets the motor control each wheel directly. The key technologies for in-wheel system, including drive motor and the controller, were developed in-house.

The in-wheel system is the latest technology with no record of being mass-produced anywhere globally. Hyundai Mobis currently is verifying its reliability for mass-production based on IONIQ 5 with Hyundai Motor Company.

Hyundai Mobis began developing the in-wheel system in 2010 in response to the emerging electric car market. In-wheel motor requires a complex design process to place a powertrain on wheels that needs to overcome a series of challenges, including securing of drive performance and durability.

Key highlights of the in-wheel system are enhanced drive and power efficiency, longer cruising range, improved driving performance and unique steer modes. It also maximizes the drive efficiency without the need to install a separate power transmission component, such as a drive shaft (the component that transmits torque to wheels), and improve power efficiency.

Additionally, in-wheel systems improve the driving range of electric vehicles with secured battery capacity and frees up space inside and allows the vehicle to use the room for existing driving systems. The system also provides efficient torque distribution for each motor in a wheel, enabling optimum turns and body control.

The technology improves the turn movement and power efficiency by approximately 20% or more through efficient torque distribution in all four directions. Unique features such as crab walking and zero turns are also available with the in-wheel system.

The in-wheel motor is the key technology of the e-corner system, which was unveiled on the IONIQ 5 at CES 2023. The e-corner system is an integrated solution that combines electronic steering, braking, and suspension technologies centered around the in-wheel motor. Hyundai Mobis is currently developing the e-corner system with a goal of completing its development within the next five years.

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