The difference between dc motor speed and ac motor speed regulation

Answer:

The difference between dc motor speed and ac motor speed regulation is the difference of working principle. Dc motor speed control: to make the armature is a direction of the electromagnetic torque, the key is: when the coil side under the different polarity of magnetic pole, how to through the direction of the current in the coil in a timely manner to transform, namely the so-called "reverse". This must add a device called a commutator, commutator brush it can ensure each pole in the coil side under the current is always in one direction, can cause the electric function continuous rotation.

Ac motor speed control: by changing the ac motor speed control of ac motor power supply frequency, a logarithmic and slip electrical parameters, such as to realize the speed regulation technology.

Ac speed adjustment is used to change the frequency of ac power supply to change the speed of the motor. Now it is more efficient to use ac speed, energy saving and less failure of motor.