There are many types of motors, but they can be roughly […]
There are many types of motors, but they can be roughly divided into AC motors and DC motors for different occasions.
The motors are divided into DC motors and AC motors according to the power used. Most of the motors in the power system are AC motors, which can be synchronous motors or asynchronous motors (the motor's stator magnetic field speed and rotor rotation speed do not maintain synchronous speed).
The motor is mainly composed of a stator and a rotor. The direction in which a conducting wire is forced to move in a magnetic field is related to the direction of the current and the direction of the magnetic induction line (the direction of the magnetic field). The working principle of the motor is that the magnetic field acts on the current to force the motor to rotate.
The advantage of a DC motor is that it is relatively simple in terms of speed control. It only needs to control the voltage to control the common speed. However, this type of motor should not be operated in high temperature and flammable environments. As a component of commutator (with brush motor), it is necessary to regularly clean the dirt generated by the friction of the carbon brush. A brushless motor is called a brushless motor. Compared with a brush, a brushless motor is more energy efficient and quieter because it reduces the friction between the carbon brush and the shaft. The production is more difficult and the price is higher.
AC motors can be operated in high temperature, flammable environments, and do not need to regularly clean the dirt of carbon brushes, but it is more difficult to control the speed, because the frequency of the AC motor must be controlled by the frequency of the AC power (or use of induction The motor, by increasing the internal resistance, reduces the speed of the motor at the same frequency of the alternating current), and controlling its voltage will only affect the torque of the motor. -General civil motors have voltages of 110V and 220V. In industrial applications, there are also 380V or 440V.