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What is the difference between asynchronous motor and synchronous motor?
Date：May 17th,2023
Motor in all walks of life will be used, in all kinds of motor, asynchronous motor is the most common kind of power equipment, in some occasions will also see the use of synchronous motor. The same AC motor, what is the difference between assynchronous motor and synchronous motor? Today by this question and friends to discuss the difference between these two motors.
Let's start with the most widely used asynchronous motors. First, we will analyze the basic structure of the asynchronous motor. In fact, the structure of the asynchronous motor is relatively simple, mainly including the stator part and the rotor part. Motor at the time of start, there will be two so-called speed, a speed is we use the eyes can't see the speed, the speed we call it electromagnetic field rotation speed, it is the motor into three phase ac, formed in the motor stator magnetic field speed, generally expressed with n0, the n0 we also call synchronous speed, the speed not only with the power frequency, but also with the motor stator winding formed by the magnetic pole logarithm. For example, we use a three-phase alternating current, whose operating frequency is 50 HZ, if the magnetic pole log of the motor is 1. Then according to formula: n0=60f / p=60x50 / 1 = 3000 r/min, if the magnetic pole log of the motor is 2, then n0=60f / p=60x50 / 2 = 1500 r/min. These speed we can't see, we can see the motor speed is the motor rotor speed, the speed is due to the rotor in the rotating magnetic field, the rotor in the rotor, the induction of the current in the rotating magnetic field and the action of the formation of the rotation, so from the two speed time, is the rotation of the stator and then the rotation of the rotor, we can also understand the asynchronous motor of the rotor speed always behind the speed of the stator magnetic field, so we call this motor is called asynchronous motor.
We know that the synchronous motor is rarely used in occasions, its structure can also be divided into the rotating part and the non-rotating part, the rotating part of the rotor we call it the magnetic pole, the non-rotating part of the stator we call it the armature. So the so-called synchronization is the rotating magnetic field formed by the child n0 and the rotor speed n is no speed difference, so their speed is equal, that is, n0=n=60f / p, this is the origin of the name of the synchronous motor.
Since the two rotation speed is the same, there is no speed difference, then how does it rotate? This is from the structure of the synchronous motor, just said the stator of the synchronous motor is the armature, the rotor is a magnetic pole, it is in the stator into the three-phase alternating current, in the rotor also to the current, the current is direct current. In this way, the stator of the synchronous motor will produce a rotating magnetic field, so the rotor will form a constant magnetic field because of the direct current, and the two magnetic fields will attract each other, so the rotor of the synchronous motor will be rotated by the action of electromagnetic force.
I just made a simple comparison of the asynchronous motor and the synchronous motor, from the comparison we can see that the synchronous motor is more than asynchronous
Let's start with the most widely used asynchronous motors. First, we will analyze the basic structure of the asynchronous motor. In fact, the structure of the asynchronous motor is relatively simple, mainly including the stator part and the rotor part. Motor at the time of start, there will be two so-called speed, a speed is we use the eyes can't see the speed, the speed we call it electromagnetic field rotation speed, it is the motor into three phase ac, formed in the motor stator magnetic field speed, generally expressed with n0, the n0 we also call synchronous speed, the speed not only with the power frequency, but also with the motor stator winding formed by the magnetic pole logarithm. For example, we use a three-phase alternating current, whose operating frequency is 50 HZ, if the magnetic pole log of the motor is 1. Then according to formula: n0=60f / p=60x50 / 1 = 3000 r/min, if the magnetic pole log of the motor is 2, then n0=60f / p=60x50 / 2 = 1500 r/min. These speed we can't see, we can see the motor speed is the motor rotor speed, the speed is due to the rotor in the rotating magnetic field, the rotor in the rotor, the induction of the current in the rotating magnetic field and the action of the formation of the rotation, so from the two speed time, is the rotation of the stator and then the rotation of the rotor, we can also understand the asynchronous motor of the rotor speed always behind the speed of the stator magnetic field, so we call this motor is called asynchronous motor.
We know that the synchronous motor is rarely used in occasions, its structure can also be divided into the rotating part and the non-rotating part, the rotating part of the rotor we call it the magnetic pole, the non-rotating part of the stator we call it the armature. So the so-called synchronization is the rotating magnetic field formed by the child n0 and the rotor speed n is no speed difference, so their speed is equal, that is, n0=n=60f / p, this is the origin of the name of the synchronous motor.
Since the two rotation speed is the same, there is no speed difference, then how does it rotate? This is from the structure of the synchronous motor, just said the stator of the synchronous motor is the armature, the rotor is a magnetic pole, it is in the stator into the three-phase alternating current, in the rotor also to the current, the current is direct current. In this way, the stator of the synchronous motor will produce a rotating magnetic field, so the rotor will form a constant magnetic field because of the direct current, and the two magnetic fields will attract each other, so the rotor of the synchronous motor will be rotated by the action of electromagnetic force.
I just made a simple comparison of the asynchronous motor and the synchronous motor, from the comparison we can see that the synchronous motor is more than asynchronous