What is the difference between asynchronous and synchronous in the three-phase motor?
The so-called synchronous motor is the rotational speed of the armature winding, which is the same as the rotation of the rotor. Such an electric motor is typically made of a winding on the rotor and a concentrated excitation winding. No winding on the rotor, and the permanent magnet structure; The rotor has no winding, no permanent magnet, tooth and groove. There is a distributed winding on the stator. The use of such structures is to minimize the number of slides and brushes, which are called refield motors. There is also a special requirement for the excitation winding to be placed on the stator, which is commonly referred to as the armature type (such as the home ceiling fan). There is a big difference between asynchronous motors and synchronous motors: The work of synchronous motor depends on "the magnetic field is always in the shortest direction of the magnetic circuit", for example, in the case of the lost motor. After excitation on the rotor, N and S are present. And then the stator field is rotating, and its N, S polar interchanges, always correspond to the magnetic poles on the rotor. So it's in sync. More importantly, the magnetic poles of the fixed and rotor must be the same, otherwise the machine won't work.
The asynchronous motor is induced by induction. The principle is that, after the stator winding plus the three-phase voltage, the rotational magnetic field is formed, and the conductors on the rotor are cut off the magnetic force line, so the electric potential is generated. And because the bars are connected, the current is generated. At this point, we think of what we learned in junior high school -- "a charged conductor can produce motion in a magnetic field." So, such an electric motor is called "induction motor". For asynchronous or induction motors, the number of the rotor's rotor is automatic induction stator. You can also say that the rotor has no polar number. (this is an example of an armature winding on a stator.) The asynchronous motor does not have a pivot/turn field. The main difference between the two main differences is that there is no work, no work can be made, and it can be absorbed. Asynchronous motors can only absorb no work. Synchronous motor is synchronous with the power grid, and the asynchronous motor speed is slightly lower than the speed of the grid. Synchronous motor speed is synchronous with ac frequency 50Hz power supply, i.e., the two pole motors are 3, 000, 4, 1500, 6, 1000, etc., and the speed of the asynchronous motor is slightly lagging, which is 2, 2880, 4, 1440, 6, 960, etc.
Relative rotating magnetic field induction motor, there is a speed difference is asynchronous motor rotor is always slower than a rotating magnetic field, synchronous motor after speed stability and speed of a rotating magnetic field, are synchronous
Synchronous motor is the ac motor, the stator winding is the same as the asynchronous motor. The rotational speed of its rotor is the same as the rotational field produced by the stator winding, so it is called the synchronous motor. As a result of this, the current of the synchronous motor is in phase over the voltage, the synchronous motor is a capacitive load. For this reason, in many cases, the synchronous motor is used to improve the power factor of the power supply system. There are two kinds of synchronous motors in the structure: 1, the rotor USES direct current for excitation. It made salient pole rotor type, installed on the magnetic core field coil is in series, connect with alternation of opposite polarity, and there are two root lead connected to the two above the slip ring mounted on the shaft. Field coil is made by a small dc generator or battery to motivate, in most of the synchronous motor, dc generator is mounted on the motor shaft, used to supply the rotor pole coil excitation current.
