The difference between synchronous motor and asynchronous motor
Synchronous motor for motor operation. The synchronous motor can adjust the excitation current to make it run in the leading power factor, power factor, to improve the power grid so that large equipment, such as large air blower, water pump, compressor, ball mill, rolling mill, synchronous motor driver. This advantage is particularly pronounced when low-speed large equipment uses synchronous motors. In addition, the speed of the synchronous motor is entirely determined by the frequency of the power supply. When the frequency is constant, the speed of the motor is certain, and it does not change with the load. This characteristic is very important for some transmission systems, especially for multi machine synchronous drive system and precise speed regulation and speed stabilization system. The stability of synchronous motors is relatively high. The synchronous motor usually operates under the excitation state, and its overload capacity is greater than that of the corresponding asynchronous motor. The torque of an induction motor is proportional to the square of the voltage, while the torque of the synchronous motor is determined by the product of the electromotive force generated by the voltage and the excitation current of the motor, which is only proportional to the primary voltage of the motor. When the grid voltage suddenly drops to the rated value of 80% when the torque of asynchronous motor is decreased to about 64%, and stop with real load; and the torque of synchronous motor is not decline, but also through forced excitation to ensure stable operation of the motor.
The synchronous motor belongs to an alternating current motor, and the stator winding is the same as the asynchronous motor. Its rotor speed is the same as that of the rotating magnetic field generated by the stator winding, so it is called synchronous motor. Because of this, the phase of the synchronous motor is ahead of the voltage in phase, that is, the synchronous motor is a capacitive load. To this end, in many cases, synchronous motors are used to improve the power factor of the power supply system.
Synchronous motor (synchronous motor) is an alternating current motor that generates torque by synchronous excitation of the exciting magnetic field and the rotating magnetic field of the armature.An alternating current motor with the same rotor speed as the rotating magnetic field of the stator. The rotor speed n and the magnetic pole logarithm P, the power frequency f meet n=60f/p. The speed n is decided by the power frequency f, so when the power frequency is constant, the speed is constant and has nothing to do with the load. The utility model has the advantages of high running stability and high overload capacity. Often used in multi machine synchronous transmission system, precision speed regulation, speed stabilization system and large equipment (such as rolling mills) and so on.
Induction motor, also known as asynchronous motor, that is, the rotor in rotating magnetic field, in the rotating magnetic field under the action of a moment of rotation, and thus rotor rotation. The rotor is a rotatable conductor, usually in the shape of a mouse cage. Invented by Nicola Tesla, an electrical engineer in 1887.The induction motor is also called asynchronous motor, that is, the rotor is placed in a rotating magnetic field, and a rotational torque is obtained under the action of the rotating magnetic field, so that the rotor rotates.
