Guilherme Hitoshi Kaneko, Alisson Cocci de Souza, Tsuyoshi Kawanami, Numerical simulation of a linear thermomagnetic motor’s dynamics based on experimental force and temperature data, Journal of thermal Science and Technology, Vol.628, (2025-9), p. 25-00119.
- ABSTRACT: A significant portion of industrial energy is lost as low-grade thermal waste, typically at temperatures below 230°C. Efficient recovery of this waste heat remains a major challenge, and solid-state technologies such as thermomagnetic motors have emerged as promising solutions for energy harvesting. These motors operate based on the temperature-dependent magnetic phase transition of magnetocaloric materials near their Curie temperature (TC), allowing mechanical motion to be generated from thermal gradients. This study investigates the dynamics of a thermomagnetic motor composed of a pair of magnetocaloric heat exchangers (MHEs) operating in opposite phases. Computational simulation, supported by experimental force and temperature data, was developed to analyze the influence of three key parameters: the distance between MHEs (d_MHE), the halfcycle period (p), and the suspended weight (W). A maximum net power output of P = 1.43 W was obtained for the configuration d_MHE = 31 mm, W = 18 N, and p = 2.6 s. The results provide insights into the impact of these parameters on the motion and power output of the motor, revealing the interplay between magnetic forces, thermal gradients, and mechanical response. Understanding these effects is crucial for optimizing thermomagnetic energy harvesting systems, enhancing their efficiency and applicability in waste heat recovery.
- DOI: https://doi.org/10.1299/jtst.25-00119
