Dc motor controller and ac motor controller of three big difference

Today we are going to learn about the difference between dc motor controller and ac motor controller. 1. External power supply: dc motor controller chooses direct current for power supply, and choose an alternating current for power supply ac motor controller. 2. Structure: the principle of dc motor controller is relatively simple, complicated structure, bad for maintenance; The principle of ac motor controller is complex, but the structure is simple, easy to maintain. 3. Speed: dc motor controller without other device to cooperate, can achieve smooth and economical speed; Complete control of motor speed and ac motor controller cannot themselves, need a frequency conversion device. That is the difference, you know?