Performance Investigation and Design Parameter Sensitivity Analysis of a Cageless Permanent-Magnet Assisted Synchronous Reluctance Generator

This study presents a comprehensive performance and parameter-sensitivity analysis of a cageless permanent-magnet-assisted synchronous reluctance generator (PMASRG), evaluating its efficiency, torque characteristics, and operational stability under varying electrical and mechanical conditions. To address the limitations of conventional reluctance machines, such as low power factor and torque ripple, permanent magnet assistance is incorporated and analysed using the classical d–q reference frame model. A dynamic mathematical model based on d–q voltage equations, flux linkages, and electromagnetic torque expressions is developed to simulate the generator's behaviour across different operational points. The results indicate that the machine achieves a peak electromagnetic torque of approximately 3.75 Nm at a rated current of 6.5 A, while delivering nearly 1.5 kW at 1500 rpm, exceeding its nominal 1 kW rating. The generator exhibits a maximum efficiency of about 92% at moderate load levels, with performance declining at higher loads due to increased copper losses. Sensitivity analysis reveals that variations in d-axis inductance have a more pronounced impact on output power than changes in q-axis inductance, underscoring the importance of rotor saliency optimisation. The proposed generator demonstrates strong potential for variable-speed and renewable energy applications.