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Permanent magnet synchronous motor, which equipment is more reasonable to save energy?

Compared with the power frequency motor, the permanent magnet synchronous motor is easy to control, the speed is determined by the power frequency, the operation is stable and reliable, and it does not change with the fluctuation of the load and voltage. In view of the strict synchronization of the speed of the permanent magnet synchronous motor, it determines the advantage of the motor's good dynamic response performance, which is more suitable for variable frequency control.

Permanent magnet motor is a kind of energy-saving motor, and it has been well promoted in many application fields, but not all working conditions and occasions are required or suitable to use permanent magnet synchronous motor, which is a very worthy of discussion.

Theoretically, the permanent magnet synchronous motor is more suitable for loads with frequent load changes, and the motor often runs in no-load or light-load state, such as lathes, punches, chemical fiber, textile, wire drawing equipment, and its final energy-saving effect is more obvious. , the average power saving rate can reach more than 10%.

In many occasions, especially when the cage motor is selected, in order to make the equipment start smoothly, in most cases, the motor will be selected according to the maximum load of the equipment, which will inevitably lead to a relatively low load rate and a poor motor capacity during normal operation of the motor. In the case of serious excess, when the motor is running, the efficiency is related to the size of the load. Generally, when the motor is running without load, the efficiency is close to zero, and when the load increases, the efficiency also increases. When the load reaches 70% of the rated load, the efficiency is the highest; therefore, the motor is the most efficient, energy-saving and economical when it is operated close to the rated load. If the matching asynchronous motor is replaced with a high starting torque permanent magnet synchronous motor, the result of configuring the energy input on demand will play a great role in saving energy. The advantage of the permanent magnet synchronous motor lies in its two lows and two highs, namely low loss and temperature rise, high power factor and efficiency, which is also the pursuit of motor performance by people, which determines the market application status of permanent magnet motors.

Therefore, when customers choose a matching motor, they should conduct a comprehensive analysis based on the actual equipment and working conditions, not just stay on the motor itself, but fully consider the energy-saving effect of the system.

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