The function of a motor is to convert electrical energy into mechanical energy. There are two categories of motors: AC motors and DC motors. But there are huge difference between AC motor and DC motor.
DC motor is the rotating motor that is capable of converting DC energy into mechanical energy (DC motor) or converting mechanical energy into DC energy. When the DC motor is running as a DC motor, it converts electrical energy into mechanical energy; when the DC motor is running as a generator is running, it converts mechanical energy into electrical energy.
DC motor is composed of two major components: stator and rotor. The part of the DC motor that remains stationary during the motor running is called a stator, and the function of a stator is to produce magnetic field. The part of the DC motor that runs with the motor is called a rotor, and its main role is to produce electromagnetic torque and induced electromotive force, and it is the DC motor hub for energy conversion, which is why it is also called the armature.
AC motor is used to implement the AC power and mechanical energy conversion. Due to the great development of Veichi AC power systems, AC motors has become the most commonly used motors. Compared with DC motors, there is no commutator and the structure is simple and strong that is easy to manufacture, as a result, high-speed, high voltage, high current, high-capacity motors can be produced easily. Learn about AC servo motors.
1. Rotating magnetic fields difference between DC and AC motors:
There is difference between DC and AC motors in terms of rotating magnetic fields. For AC synchronous motor, the stator field rotates because the
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 motor, the rotating magnetic field is formed by the change of distance between the constant voltage and the actual location of the coil connected.
2. AC and DC motor difference in speed control method:
For Veichi AC synchronous motors, the motor speed can be changed as long as the speed of the alternating current changes; For Veichi 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.
3. Torque generation method difference between DC motor and AC motor:
For AC induction motor, 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 DC motor and AC motor, DC and AC motor drivers re also different in functions and applications.