The speed regulation of Mitsubishi inverter power regulator is adopted, one is to regulate the speed according to the requirements, and the other is to save energy. It is based on the following elements:
1) The frequency conversion speed regulation system has low loss and high operating power.
2) The motor is always kept running at a low slip rate to reduce rotor loss.
3) It can complete the functions of soft start and braking, and reduce the impact of starting current.
When using variable frequency power supply speed regulation, it is necessary to consider various aspects such as process requirements, saving benefits, and payback period. If only from the process requirements and saving benefits, it is more advantageous to choose frequency conversion speed regulation in the following situations:
According to the process requirements, the production line or a single equipment needs to adjust the motor speed according to the program or according to the requirements. For example, the transmission system of packaging machine, according to different varieties of products, needs to change the transmission speed of the system, and the use of frequency conversion speed regulation can make the speed control architecture simple, the control is accurate, and it is easy to complete the program control.
Replace mechanical speed regulation with frequency conversion speed regulation. For example, the machine tool can not only eliminate the messy gear gearbox, but also improve the accuracy and meet the requirements of program control. Frequency conversion speed regulation instead of using gates or baffles to adjust the flow rate is suitable for fans, pumps, compressors, etc. For example, the boiler pump, blower, and induced draft fan are controlled by frequency conversion speed regulation, which not only eliminates the need for servo amplifiers, electric operators, electric actuators and feed valves (or wind shields), but also makes the entire boiler and boiler control system get fast dynamic response, high control accuracy and stability.
After the 70s of the 20th century, the development of large-scale integrated circuits and computer control skills, as well as the use of modern control theory, made the communication power drag system gradually have a wide speed regulation scale, high steady speed scale, high steady speed accuracy, fast dynamic echo and good technical functions such as reversible operation in the four quadrants, and can compare with DC power drag in terms of speed regulation function. In the communication speed regulation skills, frequency conversion speed regulation has the best advantages, and its speed regulation function and reliability are constantly improved, and the price is constantly reduced, especially the frequency conversion speed regulation has a significant power-saving effect, and it is easy to complete the process automation, which is deeply loved by the industrial industry.
1. Excellent characteristics of communication frequency conversion speed regulation
1) Good smoothness and high power when regulating speed. At low speed, the characteristic static shutdown rate is high, and the relative stability is good.
2) The speed regulation scale is large and the precision is high.
3) The starting current is low, there is no impact on the system and the power grid, and the power saving effect is significant.
4) The variable frequency power supply is small in size, which is easy to install, debug and maintain.
5) Easy to complete process automation.
6) There must be a dedicated variable frequency power supply and voltage regulator, which is now more expensive.
7) When the constant torque is regulated, the overload of the motor in the low-speed section can be greatly reduced.
2. Comparison with other speed regulation methods There are three speed regulation methods for communication motors: pole change speed regulation, change slip rate speed regulation and frequency conversion speed regulation. Among them, frequency conversion speed regulation has advantages. Here is only a comparison between the communication frequency conversion speed regulation system and the DC speed regulation system. Communication drags on its own existence and can unleash the potential for power saving. In the communication speed regulation system, there is often a certain margin when selecting the motor, and the motor is not always running under the highest load condition; If you use the speed regulation skill of variable frequency power supply, when the speed of the motor is controlled, the intention of saving power can be achieved by controlling the speed of the motor. A large number of fans, pumps, compressors, etc. are used in industry, and their electricity consumption accounts for about 50% of industrial electricity consumption; If the speed regulation technology of variable frequency power supply is adopted, its power can be greatly improved, and the electricity consumption cost can be reduced by 10%.
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