1. Adjustable torque limit
After frequency conversion speed regulation, the corresponding torque limit can be set to protect the machine from damage, thereby ensuring the continuity of the process and the reliability of the product. The current frequency conversion technology makes not only the torque limit adjustable, but even the torque control accuracy can reach about 3% to 5%. In the power frequency state, the motor can only be controlled by detecting the current value or thermal protection, and cannot set the precise torque value to act like in the frequency conversion control.
2. Controlled stop mode is the same as controllable acceleration. In frequency conversion speed regulation, the stop mode can be controlled, and there are different stop modes to choose from (deceleration stop, free stop, deceleration stop and 10 DC braking), the same It can reduce the impact on mechanical components and motors, so that the entire system is more reliable, and the life span will increase accordingly.
Three, energy saving
Centrifugal fans or water pumps can greatly reduce energy consumption after adopting frequency converters, which has been reflected in more than ten years of L-process experience. Since the final energy consumption is a square ratio to the speed of the motor, the return on investment is faster after frequency conversion.
Four, reversible operation control
In the inverter control, to realize the reversible operation control, no additional reversible control device is needed, only the phase sequence of the output voltage needs to be changed, which can reduce maintenance costs and save installation space.
Five: reduce mechanical transmission parts
Because the current vector control frequency converter plus synchronous motor can achieve high-efficiency torque output, thus saving gearbox and other mechanical transmission parts, and finally forming a direct frequency conversion transmission system. This can reduce the amount of wood and space and improve the stability.
Six: lower power required at startup
The power of the motor is proportional to the product of current and voltage, so the power consumed by the motor directly started by I frequency will be much higher than the power required for variable frequency start. In some conditions, its power distribution system has reached its maximum limit, and the surge generated by the direct power frequency starting motor will have a serious impact on other users on the same network, and will be warned by the grid operator or even fined. . If the frequency converter is used to start and stop the motor, similar problems will not occur.
Seven: Controllable acceleration function
The frequency conversion speed regulation can start at zero speed and accelerate evenly according to the needs of users, and its acceleration curve can also be selected (linear acceleration, S-shaped acceleration or automatic acceleration). However, when starting through the I. frequency, the motor or the connected mechanical part shaft or gear will produce violent vibration. This vibration will further aggravate mechanical wear and loss and reduce the life of mechanical components and motors. In addition, variable frequency start can also be applied to similar filling lines to prevent bottles from tipping over or being damaged.
Eight: Adjustable operating speed
The use of frequency conversion speed regulation can optimize the L art process, and can quickly change according to the art process, and can also realize the speed change through remote control PLC or other controllers.
Nine: Control the starting current of the motor
When the motor is started directly through frequency I, it will generate 7 to 8 times the rated current of the motor. This current value will greatly increase the electrical stress of the motor windings and generate heat, thereby reducing the life of the motor. The frequency conversion speed regulation can be started at zero speed and zero voltage (or torque boost can be appropriately added). Once the relationship between frequency and voltage is established, the inverter can drive the load to work in accordance with the V/F or vector control mode. The use of variable frequency speed regulation can fully reduce the starting current and increase the winding capacity. The most direct benefit for users is that the maintenance cost of the motor will be further reduced and the life of the motor will increase accordingly.
Ten: Reduce power line voltage fluctuations
When the motor starts at L frequency, the current will increase sharply, and the voltage will fluctuate greatly. The magnitude of the voltage drop will depend on the power of the starting motor and the capacity of the distribution network. The voltage drop will cause the voltage sensitive equipment in the same power supply network to trip or malfunction. For example, PCs, sensors, proximity switches and contactors will all operate incorrectly. After adopting variable frequency speed regulation, since it can be started gradually at zero frequency and zero voltage, the voltage drop can be eliminated to the greatest extent.
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Zhejiang Casnovo Materials Co., Ltd. , https://www.casnovo-new-energy.com