Novel PM Configuration for the Trans-Rotary Magnetic Gear with Enhanced PM Utilization

This paper introduces a novel magnet configuration for a radially magnetized trans-rotary magnetic gear (TROMAG) that offers higher shear stress per magnet volume and shear stress per gear mass. TROMAG is a type of magnetic gear that converts linear motion to rotation and vice versa. The device is known for its high force density and high gear ratio. Different permanent magnet (PM) configurations have been introduced for the TROMAG; namely, radially-magnetized (RMT), axially-magnetized (AMT), and Halbach-magnetized (HMT) TROMAG. While RMT is the least challenging from a fabrication perspective, its conventional PM configuration has shear stress and shear stress per PM volume lower than that of HMT. The novel RMT configuration introduced in this paper, compared to the conventional RMT, offers up to ~47% higher shear stress per PM volume and up to ~26% higher shear stress per TROMAG’s mass.