1. First of all, the external power supply of the two is different. DC motors use direct current as the power supply; while AC motors use alternating current as the power supply.
2. Structurally speaking, the former has a relatively simple principle, but the structure is messy and inconvenient to maintain; while the latter has a messy principle but a relatively simple structure, and is easier to maintain than a DC motor.
3. In a DC motor, the magnetic field does not move and the conductor moves in the magnetic field; in an AC motor, the magnetic field rotates and the conductor does not move.
4. In terms of speed regulation, DC motors can achieve smooth and economical speed regulation without the cooperation of other equipment. Speed regulation can be achieved by simply changing the input or excitation voltage and current; while AC motors cannot achieve speed regulation by themselves and need to rely on Frequency conversion equipment to achieve speed changes.
5. The structure of the motor is different. The DC motor passes direct current and does not directly generate a rotating magnetic field. It relies on the commutator that rotates with the rotor to change the direction of the current entering the rotor at any time, so that the polarity of the magnetic field between the rotor and the stator is always opposite. In this way The rotor can rotate; and since the AC motor uses alternating current, as long as the stator coil is arranged in phases, a rotating magnetic field will naturally be generated.