Servo motors are primarily categorized into AC servo motors and DC servo motors based on their power supply. AC servo motors are widely used in industrial robotics and CNC machinery due to their high efficiency, robustness, and ability to handle high current surges. On the other hand, DC servo motors are preferred for smaller applications like radio-controlled cars and drones because they offer simple control and rapid acceleration, though they require more maintenance due to brush wear. Additionally, within these categories, brushless servo motors are often highlighted for their superior precision, quiet operation, and longer lifespan compared to their brushed counterparts.