Why use a frequency converter?

Why use a frequency converter? With the increase of industrial automation, the frequency converter has also been widely used. Today, variable frequency speed control has been recognized as the most ideal speed control method by various companies and users. Not only can it improve labor productivity and improve the living environment, it can also save energy and save electricity, and lower production costs.

Correct selection of a universal inverter is critical to the normal operation of the drive control system. The purpose of using a general-purpose inverter must be clearly defined, and the requirements for the type of production machine, speed range, speed response and control accuracy, and starting torque must be clearly established. To fully understand the load characteristics driven by the inverter, the general inverter that decides what function to use constitutes the control system, and then decides which control method to use is most appropriate. The general inverter chosen should meet both the requirements of the production process and the technical and economic indicators. If the general frequency changer chooses the type, the system design and the improper use, will often cause the frequency changer not to be able to operate normally, will not achieve the anticipated goal, will even cause the equipment breakdown, will cause the unnecessary loss. In addition, in order to ensure the long-term reliable operation of the universal inverter, the ground connection of the inverter is also very important.

1, the drive function and use of the inverter and the AC motor <br> <br> configuration of the drive transmission may be referred to as transmission speed, the function uses the following. Which may be related to each other, in fact no clear classification, see the table below, for reference only.

2. Advantages of using frequency converters (1) Energy saving by frequency conversion and speed adjustment Because of the adoption of variable frequency speed regulation, the energy saving effect of fans and pump loads is the most obvious, and the energy saving rate can reach 20% to 60%. This is because of the fan pumps. The power consumption is proportional to the third power of the rotation speed. When the average flow rate required by the user is small, the rotation speed of the fan and the water pump is low, and the energy saving effect thereof is also very considerable. However, when the conventional baffle and door are used for flow adjustment, the power consumption does not change much. Due to the large number of such loads, which accounts for about 20% to 30% of the total capacity of the AC motors, their energy saving has a very important significance.

For some constant torque loads that operate at low speeds, such as conveyor belts, variable frequency speed regulation can also save energy. In addition, the original energy-consumption methods are more energy-consuming (such as winding rotor motor, etc.), the original speed control method is relatively complex, the lower efficiency (such as planer, etc.), after the use of frequency control, The energy saving effect is also obvious.

(2)Advantages of frequency conversion and speed regulation in motor operation Variable frequency speed control is easy to achieve forward and reverse rotation of the motor. It is only necessary to change the switching sequence of the inverter's internal inverter tube to realize the output commutation, and there is no problem of burning the motor due to improper commutation.

Most frequency conversion speed control systems start from a low speed and have a low frequency. Acceleration and deceleration time can be arbitrarily set, so the acceleration and deceleration time is relatively flat, the starting current is small, and the start and stop of higher frequency can be performed.

When the frequency conversion speed control system brakes, the frequency converter can use its own brake circuit to consume the energy of the mechanical load on the braking resistor, and can also feed back to the power supply grid. However, special accessories are added to the power grid to provide greater investment. In addition, the inverter also has a DC braking function. When braking is required, the inverter adds a DC voltage to the motor to perform braking, and no additional brake control circuit is required.

(3) Application for the purpose of improving the technological level and product quality In addition to the application of fan and pump loads, frequency conversion speed control can be widely applied to various types of machinery such as conveying, winding, lifting, extrusion, and machine tools. Equipment control area. It can increase the odd production yield, prolong the normal working period and service life of the equipment, simplify the operation and control system, and can even change the original process specification, thereby improving the overall equipment control level.

The purpose and advantages of using the inverter are described in detail above, I believe you have already understood. Therefore, users can choose different types of inverter according to their own actual process requirements and application occasions when using frequency conversion speed regulation.