What is the specific difference between a DC motor and an AC motor?

The difference between AC motors and DC motors: In terms of structure, the principle of DC motors is relatively simple, but the structure is complex and difficult to maintain. The principle of an AC motor is complicated, but its structure is relatively simple, and it is easier to maintain than a DC motor. Next, I will list some specific differences between DC motors and AC motors in detail, and what are the more obvious differences.

     1. First of all, the external power supply of the two is different: the DC motor uses the DC power supply as the power supply, and the AC motor uses the AC power supply as the power supply.

     2. In terms of structure, the former has a relatively simple principle, but the structure is complex and difficult to maintain; the latter has a complex principle but relatively simple structure and is easier to maintain than a DC motor.

     3. The DC motor does not move the magnetic field, the conductor moves in the magnetic field, and the AC motor rotates the magnetic field, but the conductor does not move.

     4. In terms of speed control, as long as the input or excitation voltage and excitation current are changed, smooth and economical speed control can be realized without the participation of other equipment. Although the AC motor itself cannot be used for speed control, it needs frequency control. A device that realizes speed changes.

     5. The structure of the motor is different. The DC motor is connected to a DC power supply and does not generate a direct 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. The rotor can rotate. Since AC motors use AC power, as long as the stator coils are in phase, the rotating magnetic field will of course be generated.