Principle Verification and Transmission Characteristics Improvement of Induction/Synchronous Magnetic Gears

Abstract

  Magnetic gears can transmit torque and change speed without any mechanical contacts. Therefore, vibration and acoustic noise are very low, and maintainability is high. Various kinds of magnetic gears have been proposed. Among them, the flux-modulated-type magnetic gear has a higher torque density and efficiency compared to conventional magnetic gears. Magnetic gears have a torque limiter function that allows them to step out and shut off power when overloaded. However, after stepping out, they cannot transmit power again unless the load torque is removed to some extent. This paper presents a novel induction/synchronous magnetic gear with a cage rotor bar. In addition, the prototype induction/synchronous magnetic gears are tested.