1. Outstanding frequency conversion speed regulation characteristics
Completing the frequency conversion speed regulation of asynchronous motor is the "century wish" that people have been waiting for since the creation of asynchronous motor for 100 years. Through unremitting improvement, enhancement and perfection, the VFD's speed regulation function is not bad, that is, compared with the DC speed regulation system, some functions will surpass the DC speed regulation. Because the frequency itself is a digital quantity, it is possible to obtain very hard mechanical properties without external feedback. At the same time, it has the advantages of high speed regulation accuracy, wide range, stable start-up, stable function, simple maintenance, etc., and is easy to complete the automatic control of the production process.
2. The problem rate of frequency conversion speed regulation system is low.
The asynchronous motor drive system can complete the technical transformation of frequency conversion speed regulation and energy saving without replacing the original motor, that is, the VFD is connected and matched between the motor and the power supply to obtain the best speed regulation. The low fault is due to the simple structure, stable function and reliable operation of the asynchronous motor, and the current in the rotor circuit does not need to be imported from the outside, so the probability of fault is very low.
3. Frequency conversion speed regulation can complete soft start.
If the asynchronous motor starts directly at full voltage, its starting current is 5-7 times the rated current, and such a large starting current will cause an impact on the traction equipment or the power grid. When the variable frequency start is selected, the starting current generally does not exceed 1.5 times of the rated current, and the starting is stable and shock-free, which completes the real soft start of the asynchronous motor.
4. Frequency conversion speed regulation will extend the service life of the equipment.
The variable frequency speed adjustment of the fan and pump load can not only meet the requirements of the load operation function, but also reduce the vibration and mechanical noise during the start-up process. VFD is used for speed adjustment of general mechanical equipment. There is no vibration and shock under start, stop, acceleration and deceleration conditions, thus extending the service life of the mechanical equipment.
5.VFD is used to smooth the torque when adjusting the conveyor speed.
VFD is used for speed conditioning of conveyor motors. It also has a good soft start and smooth torque when accelerating and decelerating with loads. Especially when starting under heavy load, the output torque can be added steadily, which is not accessible by general deceleration starters.
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