The difference between dc motor and ac motor in internal structure
Release time：2018-3-5 20:45:28 Number of clicks：408
The dc motor is the magnetic field, the conductor is moving in the magnetic field; Ac motor is a magnetic field rotation movement, and the conductor does not move.
The dc motor is divided into stator winding and rotor winding. The stator winding generates a magnetic field. When the direct current is connected. The stator winding creates a magnetic field with a fixed polarity. The force of the rotor through direct current in the magnetic field. The force of the rotor spins in a magnetic field. The direct current mechanism is complicated. Cost is high.
Ac motor divides stator winding and rotor conductor. The rotor is shaped like a squirrel cage and a conductor with a silicon steel sheet. Some ac motor rotors also have windings.
The rotation principle of three-phase asynchronous motor.
The prerequisite for the three-phase asynchronous motor to rotate is that it has a rotating magnetic field, and the stator windings of the three-phase asynchronous motor are used to generate the rotating magnetic field. We know that the three-phase power supply phase phase difference is the voltage on the phase between 120 degrees, three of the three-phase asynchronous motor stator winding on the spatial orientation also sent 120 degrees, so that when zhongtong into the three-phase power supply in the stator winding, stator windings creates a rotating magnetic field, the stator windings creates a rotating magnetic field, rotor conductors (cage) will cut the lines of magnetic force of a rotating magnetic field and induced current, the current in the rotor conducting bar and interact with a rotating magnetic field to produce electromagnetic force, electromagnetic force produced by electromagnetic torque drive rotor rotating magnetic field along the direction of rotation. In general, the actual speed of the motor is lower than that of the rotating magnetic field. For this reason, we call the three-phase motor an asynchronous motor.
The rotation principle of single - phase ac motor.
The single-phase ac motor has only one winding and the rotor is squirrel-cage.
Monophase does not produce a rotating magnetic field. To make single-phase electric function automatically spin, we can add a starter in the stator winding, starting with the main windings in space by 90 degrees, starting winding to concatenate a suitable capacitance, makes differ with approximation in the phase of the primary winding current 90 degrees, the so-called split-phase principle. These two differ 90 degrees of electricity flow in time into the two differ 90 degrees of winding on the space, will be produced in the space (two-phase) rotating magnetic field, under the effect of the rotating magnetic field, the rotor can be automatic starting.
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