Advances in Transportation Electrification: Novel Rotor Structure Suppresses Electromagnetic Vibration

Strategic Insights -

Researchers from Shandong University have proposed a novel rotor structure with opposing unequal magnetic poles to suppress torque ripple and electromagnetic vibration for traction motors. This innovative design, which has been prototyped and tested, demonstrates significant improvements in electromagnetic performance compared to traditional motor designs. The study, published in the IEEE Transactions on Transportation Electrification, highlights the potential of this new approach to enhance the efficiency and reliability of electric vehicles.

Key Takeaways:

  • The proposed rotor structure consists of two segments staggered by 90 degrees, with identical magnet volume and size in each segment, and adjustable intersection angle between two magnets of the radially symmetrical V-shaped pole.
  • The novel design eliminates radial unbalanced magnetic pull and reduces torque ripple and electromagnetic vibration.
  • Prototyping and testing of the proposed motor demonstrated significant improvements in electromagnetic performance compared to traditional motor designs.
  • The study presents a systematic analysis of the radial electromagnetic force and provides a comprehensive comparison of the proposed motor with the original motor and the rotor step-skewing motor.
  • The research has been peer-reviewed and published in the IEEE Transactions on Transportation Electrification.
  • The novel rotor structure has the potential to enhance the efficiency and reliability of electric vehicles.

Statistics:

  • The proposed motor demonstrated a 35% reduction in torque ripple and a 25% suppression of the 0th-order and 8th-order electromagnetic vibration compared to traditional motor designs (IEEE Transactions on Transportation Electrification, 2025;11(5):11385-11397).
  • The prototype motors were tested with a power output of 150 kW and a rotor speed of 5000 rpm (IEEE Transactions on Transportation Electrification, 2025;11(5):11385-11397).
  • The research was supported by the Shenzhen International Cooperation Research Project, Shenzhen Fundamental Research Program, and Guangdong Basic and Applied Basic Research Foundation.

Sources:

  • IEEE Transactions on Transportation Electrification (2025;11(5):11385-11397)
  • NewsRx (November 1, 2025) - "Data from Shandong University Advance Knowledge in Transportation Electrification (Interior Permanent Magnet Motor With Novel Opposing Unequal Magnetic Poles for Torque Ripple and Electromagnetic Vibration Suppression)"
  • Shandong University - "Interior Permanent Magnet Motor With Novel Opposing Unequal Magnetic Poles for Torque Ripple and Electromagnetic Vibration Suppression"