This book has systematically reviewed the rotor pole pattern topology technology for PM machines, presenting a comprehensive framework to address key challenges such as high torque output, minimizing torque ripple, enhancing efficiency, and optimizing structural mass. Through detailed theoretical analyses, numerical modeling, and experimental validation, some unique insights and new methodologies are presented in this book, which aligns with the growing demands of modern industrial applications, such as electric propulsion, robotics, and aerospace engineering.