The Difference Between DC Motor And AC Motor (1)

- May 01, 2019-

An alternating current motor is a machine that converts alternating current electrical energy into mechanical energy.


The AC motor consists essentially of an electromagnet winding or distributed stator winding for generating a magnetic field and a rotating armature or rotor. The motor is made by the phenomenon that the energized coil is forced to rotate in a magnetic field.



 A direct current machine is a rotating electrical machine that converts DC electrical energy into mechanical energy (DC motor) or converts mechanical energy into DC electrical energy (DC generator). It is a motor that converts DC power and mechanical energy to each other. When it is used as a motor, it is a DC motor that converts electrical energy into mechanical energy; when the generator is running, it is a DC generator that converts mechanical energy into electrical energy.


The main ones include: the input power type is different, the AC motor uses AC power (there are single-phase and three-phase points), and the DC motor uses DC power (there is constant DC and pulsating DC ~~). Different motor structures, such as DC motors, generally have brushes and commutators, and AC motors are generally not available! This is also why AC motors are more widely used than DC motors! There is often a spark between the brush and the commutator of the DC motor, causing the surface of the commutator to oxidize or even insulate. Different uses: DC motors are mainly used for power control or other equipment with wide speed regulation (requires smooth speed regulation), such as planer, rolling mill, electric rail traction (such as electric locomotive, subway), and AC motor is mainly used for tuning. Power machinery or other equipment with a small range of speed, such as general ventilators, water pumps, machine tools, cranes on construction sites, etc. Of course, in recent years, with the development of power electronics technology, such as gate-level turn-off thyristors ( GTO), the emergence of insulated gate bipolar transistors (IGBT), the speed of the AC motor has become much easier! The range of speed regulation has also been expanding. Some mechanical equipment that used to require a wide range of speed regulation has gradually adopted AC motors. For example, the harmonious high-power electric locomotive popular on the railway now uses a three-phase asynchronous motor instead of a conventional DC motor. . Order hotline: 18851570668