Fig. 3: The experimental study on the impact of the axial flux generator air gap distance on the performance of the thermomagnetic generator.
From: Thermomagnetic generators for ultra-low-grade marine thermal energy harvesting

a Power output and b torque versus load resistance. c Angular speed versus root mean square voltage. The water and air temperatures were ~30.0 °C and ~22.5 °C, respectively, for all experiments. The error bar was calculated using the standard deviation method of the experimental data.