What's the difference between a three-phase AC motor and a DC motor?

Answer:

Squirrel cage type AC motors are of small size, light weight, low price and long service life, which are opposite to the direct current motors;But the DC motor speed performance is good, AC motor is a little bit worse.

AC motor shell usually made from cast iron, only as a function of protecting and supporting the motor; and DC motor shell is made of steel or steel, except for the protection and support of motor, or part of the magnetic circuit;

In general, the armature winding of the three-phase AC motor is on the stator, and the armature winding of the direct current motor is on the rotor;