Although the dc motor controller and ac motor controller is a kind of motor controller, is produced as a result of the action of magnetic field operation. There are different, but both below small make up to explain. First of all, ac motor controller using alternating current (ac), able to communicate through the on-off switch components to control the motor controller. Dc motor controller is to use dc input, through the PWM control, input of different current. Second, smaller than ac motor controller power dc motor controller, especially the brushless motor controller, overcome many shortcomings of brush motor controller. The above is the difference between dc motor controller and ac motor controller is analyzed.