A noun explanation:
DC motor: DC power supply
AC motor: AC power supply.
Two, structural analysis:
The principle of DC motor is very simple, but it is not convenient to maintain. The AC motor is messy, but its structure is relatively simple, and it is easier to maintain than DC motor.
Three, working principle:
The DC motor of the mixer / mixer through the brush and commutator to the current into the rotor armature, so that the rotor in the stator magnetic field and the force of rotation.
AC motor (AC asynchronous motor to commonly used as an example) is the alternating current into the stator winding, to attack the rotating magnetic field of the stator and the rotor gap, rotating magnetic field attack induced current in the rotor winding, the rotor in the stator magnetic field force rotation attack. DC motor speed regulation is simple, but the use of limited. AC motor speed regulation is relatively messy, but because of the use of AC power and widely used. AC speed regulation is to change the frequency of AC power to change the speed of the motor, DC is to adjust the armature voltage to speed. Now use AC speed regulation, can save energy, the shortcomings of the motor is also less.
Four, AC motor and DC motor advantages and disadvantages:
The direct current motor has the function of providing the rated torque, which has the advantages of quick response, large starting torque and zero rated speed
Because of shortcomings, DC motor function to attack the rated load torque is stable, armature magnetic field and the rotor flux is constant to adhere to 90 degrees, which will be through a carbon brush and a commutator. Carbon brush and commutator will attack the spark, so in addition to toner will constitute the damage of the assembly, in the motor rolling application is restricted.
AC motor without carbon brush and commutator, maintenance free, stable, wide use, but if you want to arrive the equivalent characteristics of DC motor function must be used to reach chaos control technology. AC motors are divided into two types: asynchronous motor and synchronous motor. The asynchronous motor is divided into single-phase asynchronous motor, two-phase asynchronous motor and three-phase asynchronous motor. The three-phase asynchronous motor structure is simple, reliable, cheap cost etc..
However, whether it is the choice of DC motor or variable current motor, we must choose a suitable material from the equipment.