Difference and application of AC motors and DC motors

Update:26 Oct 2019
Summary:

An electric motor (Electric motor), also known as motor […]

An electric motor (Electric motor), also known as motor or motors convert electrical energy into a mechanical energy, a mechanical energy and reuse kinetic energy for driving the electrical equipment other devices. Motor (Motors) is an apparatus to convert electrical energy into mechanical energy. It is the use of the energized coil (i.e. stator windings), and generates a rotating magnetic field applied to the squirrel-cage type rotor is formed a closed magnetic aluminum frame rotational torque force. Motor are many types, but can be roughly classified into DC motors and AC motors for different applications.

By the use of different motor power into DC motors and AC motors, the motor in the electric power system is mostly alternating current motor may be a synchronous motor or an induction motor (motor stator magnetic field rotational speed of rotor rotation speed is not synchronized). Motor composed mainly by the stator and the rotor, the direction of movement of the force energized conductor in a magnetic field related with the current direction and magnetic field lines (magnetic field direction). Motor works on the current magnetic field force of the motor rotation. Benefits DC (DC Motor) is relatively simple in terms of speed control, the control only total magnitude of the voltage is controlled speed, but not the motor is operated at such a high temperature, and other flammable environment, and because the motor brushes need to be as the current transformer means (Commutator) a (brush motor), it is necessary to periodically clean the brushes friction generated contaminants.

The brushless motor called a brushless motor, with respect to the brush, brushless motor because of less friction of the brushes on the shaft and therefore less power is relatively quiet. High difficulty level, the higher the price. AC motor (AC Motor) may be operated at a high temperature, and other flammable environment, and do not regularly clean the dirt of the carbon brush, but more difficult in speed control, because the need to control the AC motor speed control frequency alternating current (induction or the motor, with increase in the internal resistance of the embodiment, the motor speed decreases at the same frequency of the alternating current), the voltage will only affect the control of the motor torque. General civil motor voltage of 110V and 220V, etc. There are two, in other industrial applications as well as 380V or 440V type.

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