Variable frequency speed regulation can be used in most motor drag occasions, because it can provide accurate speed control, so it can easily control the rise, descent and variable speed operation of mechanical transmission. The use of inverters can greatly improve the efficiency of the process (the variable speed does not depend on the mechanical part) and at the same time can be more energy-efficient than the original fixed-speed running motor. The following are ten reasons for using frequency conversion speed regulation to illustrate the fundamental understanding that the use of frequency converters is becoming more and more widespread:
1. Control the starting current of the motor
When the motor is directly started through the power frequency, it will generate 7 to 8 times the rated current of the motor, and this current value will greatly increase the electrical stress of the motor winding and generate heat, and then reduce the life of the motor. The frequency conversion speed regulation can be started at zero speed and zero voltage (torque can also be increased appropriately). Once the relationship between frequency and voltage is established, the inverter is able to drive the load according to the V/F or vector control method. The use of frequency conversion speed regulation can fully reduce the starting current, improve the winding bearing capacity, the most direct benefit of the user is that the maintenance cost of the motor will be further reduced, and the life of the motor will be increased accordingly.
2. Descend the voltage fluctuation of power lines
When the motor power frequency starts, the current increases sharply at the same time, the voltage will also fluctuate greatly, and the voltage drop will depend on the power of the motor and the capacity of the distribution network. Voltage drops can cause voltage-sensitive devices in the same power supply network to trip or work abnormally, such as PCs, sensors, proximity switches, and contactors. After the frequency conversion speed regulation is selected, because it can be gradually started at zero frequency and zero voltage, the voltage drop can be eliminated to the greatest extent.
Third, the power required at the time of operation is lower
The power of the motor is proportional to the product of current and voltage, so the power consumed by the motor directly started by the power frequency will be much higher than the power required by the variable frequency engine. In some cases, the power distribution system has now reached the maximum limit, and the power surge caused by the direct power frequency motor will have a severe impact on other users on the same network. If the inverter is used for motor start-stop, similar problems will not occur.
Fourth, controllable acceleration function
The variable frequency speed regulation can be started at zero speed and accelerated evenly according to the user's needs, and its acceleration curve can also be selected (straight line acceleration, S-shaped acceleration or active acceleration). When the power frequency is started, the motor or the connected mechanical part of the shaft or gear will oscillate violently. This oscillation will further exacerbate mechanical wear and tear, reducing the life of mechanical components and motors. In addition, the inverter engine can be used on similar filling lines to avoid bottle tipping or damage.
5. Adjustable running speed
The use of frequency conversion speed regulation can optimize the process process, and can be quickly changed according to the process process, and the speed change can also be completed through remote control PLC or other controllers.
6. Adjustable torque limit
After frequency conversion speed regulation, the corresponding torque limit can be set to maintain the machinery from damage, and then ensure the continuity of the process and the reliability of the product. The current frequency conversion technology makes not only the torque limit adjustable, but also the torque control accuracy can reach about 3%-5%. In the power frequency state, the motor can only be controlled by detecting the current value or thermal maintenance, and cannot set the exact torque value to operate as in the frequency conversion control.
7. Controlled Suspension Method
Just like the controllable acceleration, in the frequency conversion speed regulation, the abort method can be controlled, and there are different abort methods can be selected (deceleration parking, free parking, deceleration parking + DC braking), which can also reduce the impact on mechanical parts and motors, and then make the whole system more reliable, and the life expectancy will be increased accordingly.
8. Energy saving
Centrifugal fans or water pumps can greatly reduce energy consumption after selecting frequency converters, which has been demonstrated in more than ten years of engineering experience. Because the final energy consumption is squared with the speed of the motor, the return on investment is faster after the frequency conversion is selected.
9. Reversible operation control
In the inverter control, no additional reversible control equipment is required to complete the reversible operation operation, and only the phase sequence of the output voltage needs to be changed, which can reduce the maintenance cost and save the installation space.
10. Reduce mechanical transmission parts
Because now vector-controlled inverters and synchronous motors can complete efficient torque output, and then save mechanical transmission components such as gearboxes, and finally form a direct inverter transmission system. Then you can reduce the cost and space, and improve the stability.
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