This article is about what is The Difference Between AC & DC Motor
- Rotating Magnetic Field Difference
- Speed Control Difference
- Torque Generation Difference
Rotating Magnetic Field Difference
There is difference between AC and DC motors in terms of rotating magnetic fields. For AC synchronous motors, the stator field rotates because the symmetrical three-phase alternating currents are all 120 degrees behind one another. Which means the rotating of stator magnetic field is caused by the variation speed of AC. While the difference between AC and DC motor is that for DC motors, the rotating magnetic field is formed by the change of distance between the constant voltage and the actual location of the coil connected.
Speed Control Difference
For AC synchronous motors, the motor speed can be changed as long as the speed of the alternating current changes. For DC motors, the speed can be changed by just changing the rotor speed, while the rotor speed is proportional to the voltage so that the speed can be changed by changing the voltage. It seems that AC and DC motor difference has certain relationship with AC and DC power difference.
Torque Generation Difference
For AC, the rotating magnetic field of the stator and the rotating magnetic field of rotor interact to generate torque, and the rotor speed and magnetic field are synchronous. For DC motor, the magnetic field of the stator and the magnetic field of the rotor interact to generate torque, but the magnetic field does not move while the rotor armature rotates.Due to these principle differences between AC and DC motor drivers also different in functions and applications.
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