Advantages of using frequency inverters

1. Adjustable torque limit

After variable frequency speed regulation, the corresponding torque limit can be set to protect the machine from damage, thereby ensuring the continuity of the production 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, but cannot set the precise torque value to operate as under the frequency inverter control.

2. Controlled stopping method

Same as to control the acceleration process, in the frequency conversion speed regulation, the stopping method can be controlled, and there are different stopping methods to choose (deceleration stop, coast to stop, deceleration stop + DC braking). It also reduces the impact to the mechanical system and the motor, and makes the entire system more reliable and the life will be increased accordingly.

3. Energy saving

Centrifugal fans or pumps can greatly reduce energy consumption by using frequency converters, in some conditions, it can save about 20%~60% energy in average.

4. Reversible operation control to the motors

In inverter control, to achieve reverse control to the motor, no additional control device is needed, I only needs to change the frequency inverter’ output voltage phase sequence, which can reduce maintenance costs and save installation space.

5. Reduce mechanical transmission parts

The inverter works with motor directly can achieve high-efficiency torque output, thereby saving mechanical transmission components such as gear boxes, and finally forming a direct frequency conversion transmission system. This can reduce cost and space and improve stability.

6. Lower power required at startup

The power of the motor is proportional to the current and voltage, and then the power consumed by the motor started directly will be much higher than the motor started by variable frequency drive. In some working conditions, its power distribution system has reached its maximum limit. The surge generated by direct motor starting will have a serious impact on other users on the same network. If the frequency inverter is used to start and stop the motor, similar problems will not happen.

7.  Controllable acceleration function

Variable frequency speed regulation can start at zero speed and accelerate uniformly according to user's needs, and its acceleration curve can also be selected (linear acceleration, S curve acceleration or automatic acceleration). However, when starting through the power frequency, the motor or the shaft or gear of the connected mechanical part will produce severe vibration. This vibration will further increase mechanical wear and tear and reduce the life of mechanical components and motors. In addition, variable frequency startup can also be applied to similar filling lines to prevent bottles from tipping over or being damaged.

8. Adjustable running speed

The use of variable frequency speed regulation can optimize the production process, and it quickly changes according to the process changes. It can also achieve speed changes through remote control of PLC or other controllers.

9. Control the starting current of the motor

When the motor is started directly through the power frequency, 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. And the frequency inverter can start at zero speed and zero voltage, it fully reduce the starting current and increase the winding endurance. 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 be correspondingly increased.

10. Reduce power line voltage fluctuations

When the motor starts at power 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 voltage sensitive equipment in the same power supply network to trip or malfunction, such as PC, sensors, proximity switches and contactors, etc. will all operate incorrectly. After using the frequency converter, the voltage drop can be eliminated to the greatest extent because it can be started gradually at zero frequency and pressure.