Power Source is the key difference between AC and DC Servo motors. AC servo motors depend on an AC power source whereas DC Servo motors depend on DC power source (like Batteries). AC servo motors performance is dependent upon voltage as well as frequency whereas DC servo motors performance mainly relies upon voltage alone.
The key differences between AC and DC Servo motor are discussed here on the basis of important real-world factors such as efficiency, speed & torque adaptability, size, operational stability, noise, maintenance, and output power. The following table explains the key differences between AC Servo motor and DC Servo motor.
Difference between AC Servo Motor and DC Servo Motor
Characteristics AC Servo Motor DC Servo Motor Efficiency Low (about 5-20%) High Speed & Torque Adaptable to strong torque and high-sped working condition. Adaptable to a limited torque and speed. Stability Less stability issues More problems of stability Noise No radio frequency noise Brushes cause radio frequency noise Operation Have stable and smooth operation Noisy operation Weight & Size Lighter weight and small in size Heavy weight and large in size Repair & Maintenance Since no commutators, Less maintenance is required Because of commutation process, regular maintenance is needed. Output Power Deliver low power normally between 0.5W and 100W Provide high power