Due to the continuous development and progress of power electronics technology, the new control theory is proposed and improved. It is the AC speed control transmission, especially the Mitsubishi variable frequency speed control with excellent performance. It has developed rapidly, so the Mitsubishi inverter + is used in the actual work. There are more and more cases of variable frequency motors, so how to correctly select Mitsubishi inverter is essential for the normal operation of mechanical equipment. The selection method is as follows:
1. Select Mitsubishi inverter according to the load torque characteristics of mechanical equipment
In practice, mechanical equipment is often divided into the following three categories according to different load torque characteristics:
(1) Constant torque load
(2) Constant power load
(3) Fluid load
2. Select the appropriate control mode of Mitsubishi inverter according to the load characteristics.
The control methods of Mitsubishi inverter are mainly divided into: V/f control, including open loop and closed loop; vector control, including speed sensor and speed sensor control; direct torque control; the advantages and disadvantages of the three methods are as follows:
(1) V/f open loop control
Advantages: simple structure, easy adjustment, can be used for universal squirrel cage asynchronous motor;
Disadvantages: low speed torque is difficult to guarantee, torque control cannot be adopted, and the speed regulation range is small;
Mainly used occasions: general fan, pump energy-saving speed regulation or one inverter with multiple motor drive occasions.
(2) V/f closed-loop control
Advantages: simple structure, high speed regulation accuracy, can be used for general-purpose asynchronous motors;
Disadvantages: Low speed torque is difficult to guarantee, torque control cannot be adopted, speed adjustment range is small, and speed sensor should be added;
Mainly used occasions: used to maintain pressure, temperature, flow, PH and other process occasions.
(3) Vector control without speed sensor
Advantages: no speed sensor is required, the torque response is good, the structure is simple, and the speed control range is wide;
Disadvantages: need to set the motor parameters, must have automatic test function;
Use occasions: general industrial equipment, most speed control occasions.
(4) Vector control with speed sensor
Advantages: good torque control performance, good torque response, high speed regulation and large speed control range;
Disadvantages: need to correctly set the motor parameters, need automatic test function, high-precision speed sensor;
Use case: High dynamic performance applications requiring precise control of torque and speed.
(5) Direct torque control
Advantages: no speed sensor is needed, the torque response is good, the structure is simple, and the speed control range is large;
Disadvantages: need to set the motor parameters, must have automatic test function;
Use occasions: High dynamic performance applications requiring precise control of torque, such as cranes, elevators, rolling mills, etc.
3. Use the protective structure of Mitsubishi inverter according to the installation environment.
The protective structure of Mitsubishi inverter should be adapted to the installation environment. This should consider factors such as ambient temperature, humidity, dust, pH, corrosive gas, etc., which is related to the long-term, stable, safe and reliable operation of Mitsubishi inverter. . The protective structure of Mitsubishi inverter mainly includes:
(1) Open IP00
(2) Closed IP20, IP21
(3) Sealed IP40, IP41
(4) Closed IP54, IP55
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