MUMBAI, India, July 11 -- Intellectual Property India has published a patent application (202421049294 A) filed by Indian Institute Of Technology Bombay, Maharashtra, on June 27, 2024, for 'a coaxial magnetic gear with reduced cogging torque.'
Inventor(s) include Sahoo, Alok; and Hari, V. S. S. Pavan Kumar.
The application for the patent was published on July 11, under issue no. 28/2025.
According to the abstract released by the Intellectual Property India: "A coaxial magnetic gear is disclosed that significantly reduces cogging torque, a periodic torque ripple caused by the alignment of permanent magnets with ferromagnetic modulating poles. The invention achieves this by optimizing the pole-arc to pole-pitch ratio of permanent magnets on the inner and outer rotors. The method involves determining angular positions of the rotors where peak cogging torque occurs, performing a parametric sweep of pole-arc to pole-pitch ratios, and selecting the combination of ratios that minimizes cogging torque while maintaining peak torque capability. Assembly of the magnets is facilitated using spacers, which ensure precise positioning and simplify handling. The optimized design enhances smooth rotational power transmission, reduces permanent magnet material usage, and lowers the risk of fatigue in the drive train. The invention is applicable in various industries, including renewable energy systems, automotive drivetrains, medical devices, and hazardous environments, offering a practical and efficient solution for magnetic power transmission systems."
Disclaimer: Curated by HT Syndication.
