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What is the difference between DC motor and AC motor

systemdate:2020/12/31 10:42:09 from:Shanghai Zuoli
DC motor and AC motor are widely used, their basic principle is the same, both are the law of electromagnetic induction, each has its own advantages and disadvantages. According to the analysis, DC motor or AC motor has commutator, which is an important reason for the different working modes of DC motor and AC motor.

Take the motor as an example, if the motor wants to work, it must drive the rotor to rotate through the electromagnetic force felt by the rotor winding. Therefore, in order to ensure the stability and continuous rotation of the motor, the electromagnetic force induced in the rotor winding must be kept in the same direction. If the direction of rotation of the rotor is not changed during the rotation of the rotor, the direction of rotation of the rotor cannot be maintained.

This can be ensured by changing the direction of the stator magnetic field when the AC motor is working, because the stator magnetic field of the AC motor is not fixed, but rotates according to a certain law, so the direction of the electromagnetic force acting on the rotor winding can remain unchanged. As long as the stator coils are arranged in the same phase, the rotating magnetic field will naturally be generated to ensure the rotation of the rotor.

The working principle of DC motor and AC motor is the law of electromagnetic induction, but there are differences between them, which can be understood from two different starting modes. The rotor rotation of DC motor (armature winding movement or force) is due to the effect of electromagnetic force in the magnetic field on the armature winding, so the premise is that there is current in the armature, so the armature current is required to start the DC motor. As long as the AC motor has AC start on the stator, there will be a rotating magnetic field. Due to the movement of the magnetic field, the rotor winding will feel the electromotive force. As long as the rotor winding can form a closed loop, it will generate current and electromagnetic force to drive the rotor to rotate. Therefore, the premise of AC motor rotor motion is that the magnetic field is rotating, which is the difference between the two in the initial state of motion.

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