Tech Talks: Materials

Carbon Fiber Rotor Encapsulation


As the aerospace and other high-tech industries continue to evolve toward more energy-efficient, power-dense systems, new technologies are emerging that place greater demands on motors in terms of operating speeds, temperatures, efficiencies, and (in the case of aerospace electrification) weight. When choosing a surface-mount permanent-magnet topology, there is also the design challenge of magnet retention, which conventionally has been realized by use of shrunk metallic sleeves. Recently, markets have started to consider the use of composites for retention of surface-mounted magnets.

This Tech Talk reviews material selection options for magnet retention and discusses pro and cons of each with specific attention to carbon fiber material technology, which enables improvement in both power density and efficiency of permanent-magnet motors.


Aaron Williams, Director of Strategic Technologies & Business Development, Arnold Magnetic Technologies


Lisa Arrigo, SAE Media Group