What Are The Categories And Uses Of Synchronous Motors

Like asynchronous motor, synchronous motor is a kind of AC motor, which mainly uses rotation, static, electromagnetic change and mechanical movement to realize the transformation of electric energy and mechanical energy. There are many types of synchronous motor, which can be classified according to different excitation modes. The purpose of synchronous motor is also very wide. The following is a brief introduction to the classification and use of synchronous motor.

Classification of synchronous motors

1. Electrically excited synchronous motor

The rotor of an electrically excited synchronous motor is connected in series with the magnetic field coil on the magnetic pole core, with alternating opposite polarity. Two leads are connected to two slip rings on the shaft. The field coil is excited by a small DC generator installed on the motor shaft to supply the excitation current of the rotor pole coil.

The electrically excited synchronous motor cannot start automatically, so it is necessary to install a squirrel-cage winding on the rotor. When the stator group is connected to three-phase AC power, the motor will generate a rotating magnetic field, and the squirrel-cage winding will cut the magnetic line of force to generate an induction current, so the electrically excited synchronous motor rotates.

2. Permanent magnet synchronous motor

The rotor pole of permanent magnet synchronous motor is made of magnetized steel, so it can maintain magnetism. There is also a squirrel-cage winding in the permanent magnet synchronous motor, which can generate starting torque. When the motor rotates to a certain speed, the rotor display pole will synchronize with the current frequency of the stator coil, and the stator induction display pole, so the number of display poles is the same as the number of stator poles. When the motor rotates, it will rely on the magnetic pole to synchronize with the stator magnetic pole.

Purpose of synchronous motor

1. The synchronous motor has high power factor and can be operated as a motor or generator.

2. The synchronous motor can be directly coupled to a power converter, and the speed is independent of the load.

3. Synchronous motor can be used for large drive motor when it is used as synchronous condenser, and the synchronous motor adjusts the reactive power of the grid from the grid condenser.

There are two main types of synchronous motors, one is electric excitation synchronous motor, the other is permanent magnet synchronous motor. The purpose of synchronous motor can be directly coupled, so that the scope of use of synchronous motor will become more extensive, and the power direction can be changed by rotating the converter between different phases of the grid.

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