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What are the concepts of asynchronous motor and synchronous motor? What is the difference between them? Here is a copy of the Dalan Motor Xiaobian to answer you!
First, the difference between synchronous motor and asynchronous motor:
1 The biggest difference between synchronous and asynchronous is to see whether the rotor speed of the door is consistent with the magnetic field speed of the stator. If the rotational speed of the rotor is the same as that of the stator, it is called synchronous motor. If it is inconsistent, it is called asynchronous motor.
2 When the pole pair is constant, there is a strict relationship between the speed and frequency of the motor. In the technical terminology of the motor, it is synchronous. Asynchronous motors, also called induction motors, are mainly used as motors, and the rotor speed during operation is always smaller than that of synchronous motors.
3 The so-called "synchronization" is that after the current flows through the armature (stator) winding, a rotating magnetic field is formed in the air gap, and the rotating direction and the rotating speed of the magnetic field are the same as the steering and the rotating speed of the rotor, so they are synchronized. In the case of an asynchronous machine, the rotating magnetic field has a relative rotational speed with the rotor, that is, a torque is generated.
Second, why is it synchronized, why is it not synchronized?
The stator windings of synchronous and asynchronous motors are identical, the main difference being the structure of the rotor. The rotor of the synchronous motor has a DC excitation winding, so an external excitation power source is needed to introduce a current through the slip ring; and the rotor of the asynchronous motor is a short-circuited winding, and the current is generated by electromagnetic induction. In contrast, synchronous motors are more complex and costly.
Both synchronous and asynchronous motors are AC-powered motors that are powered by a 50 Hz AC grid. An asynchronous motor is a stator that sends alternating current to generate a rotating magnetic field, and the rotor is induced to generate a magnetic field, so that the two magnetic fields act to cause the rotor to rotate following the rotating magnetic field of the stator. The rotor is slower than the rotating magnetic field of the stator, and there is a slip, which is called asynchronous machine. The synchronous motor stator is the same as the asynchronous motor, but the rotor is artificially added with DC to form a constant magnetic field, so that the rotor is synchronized with the rotating magnetic field of the stator, which is called synchronous motor. Simply put: the DC excitation current is not applied to the rotor of the asynchronous motor, and a DC excitation current is applied to the rotor of the synchronous motor to make the rotation speed of the rotor coincide with the rotational speed of the magnetic field generated by the stator and rotor cutting.
3. Why should the synchronous generator rotor pass the DC excitation current instead of the AC excitation current?
Considering the power frequency of 50HZ, the rotor is energized with a DC excitation current to induce a 50 Hz potential in the stator winding. After the rotor is connected to the AC excitation current, it can be decomposed into two rotating magnetic fields, forward and reverse. The forward rotating magnetic field rotates at a speed equal to the rotor rotating speed, and induces a 100 Hz potential in the stator winding. The reverse rotating magnetic field rotates at a speed The rotor rotation speed is cancelled, and it is relatively stationary with the stator winding, and no potential is generated, but a DC component appears in the stator flux and may be saturated.
4. How to choose synchronous motor and asynchronous motor (differentiated from function and purpose)?
1 Synchronous motors are mostly used in large generators. Asynchronous motors are used almost exclusively in electric motors. The synchronous motor can flexibly adjust the voltage and current phase on the input side through excitation, that is, the power factor; the power factor of the asynchronous motor is not adjustable, generally between 0.75 and 0.85, so in some large factories, when the asynchronous motor is used more, it can be attached. A synchronous motor is used as a camera to adjust the power factor at the factory-to-grid interface. However, due to the high cost of the synchronous motor and the large maintenance workload, the capacitor compensation power factor is generally used now.
----- Editor-in-Chief: Dalan Oil Pump Motor 02-Procurement Consultant
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