Specific Torque Optimization of Control Moment Gyroscope Motor Based on Linear Regression Technique

Maximizing specific torque is crucial in the design of electric machines for control moment gyroscopes (CMG). This paper presents an in-depth investigation into specific torque optimization in permanent magnet (PM) machines with fractional-slot concentrated windings. Our research highlights three key findings: 1) The coil end-winding, though often overlooked, significantly impacts specific torque. 2) The multiple 2-pole/3-slot configuration (${{{\bm{S}}}_{{\bm{pp}}}}$ = 1/2) is the most cost-effective, requiring minimal magnets (the most expensive material) and maximizing iron usage (the least expensive material). 3) Generalized equations for material weight composition ratios are derived using weight-optimized datasets and linear regression techniques. To verify these analyses, the optimization results of the single-objective (i.e., specific torque) are collected by combining the analytical model with the sine cosine algorithm (SCA). Finally, finite-element (FE) and experimental results validate the accuracy of the analysis derived in this paper, demonstrating its applicability to CMG motor in the aerospace sector.