The frequency converter is a kind of adjustable speed drive system. It uses variable frequency drive technology to change the frequency and amplitude of the working voltage of the AC motor to smoothly control the speed and torque of the AC motor. The most common is that the input and output are AC/AC. AC converter.
Frequency converters are used in a wide range of applications, from small appliances to large mine mills and compressors. About 1/3 of the world’s energy is consumed by electric motors driving fixed-speed centrifugal pumps, fans and compressors, and the market penetration rate of frequency converters is still not high. Significant improvements in energy efficiency are one of the main reasons for using frequency converters.
There are two main differences between vector inverters and ordinary #inverters. The first is high control accuracy, and the second is low-speed output torque. It can output 150%-200% of the rated torque. Should be vector frequency conversion is to decompose the motor current into D-axis current and Q-axis current, where the D-axis current is the excitation current, and the Q-axis current is the torque current. By controlling D and Q separately, the motor can get a larger starting torque. Generally used in the occasion of heavy load start. For example, high-power long belts, and hoists, etc. At this time, the ordinary #inverter is selected because the load is too heavy at startup and the output torque is not enough, the motor will not start, and faults such as motor stall or #inverter overcurrent will be reported.
The difference between vector #inverter and ordinary inverter:
1. Low-frequency torque, the low-frequency torque characteristics of the vector #inverter are very low. The traditional V/F #inverter is difficult to output full torque below 5Hz, while the vector inverter can achieve 10~150% at 0.1Hz. torque output.
2. The control method, vector inverter, can realize closed-loop control more conveniently, while V/F #inverter is much worse.
3. Price. For inverters of the same power, the price of vector inverters is at least 20% higher than that of V/F inverters
Requirements for vector control:
1. A frequency converter can only carry one motor;
2. The number of poles of the motor should be in accordance with the requirements of the manual, generally 4 is the best;
3. The capacity of the motor is equal to the capacity of the #inverter, and the difference is at most one level;
4. The connection between the #inverter and the motor parts should not be too long. Generally, it should be within 30m. If it exceeds 30m, it is necessary to perform offline automatic adjustment after connecting the cable to re-measure the relevant parameters of the motor.
Advantages of vector control:
1. Dynamic high-speed response;
2. The low frequency torque increases;
3. Flexible control;
Application scope of vector control system:
1. Work machinery that requires high-speed operation;
2. Adapt to harsh working environment;
3. High-precision electric drive;
4. Four-quadrant operation;
For the control of ordinary water pumps, it is enough to use the special type or general type of fan pump, there is no need to choose the vector, and the price is high. The parameter settings are similar. No major difference. Vector #inverters are generally used to control frequency conversion special motors, and can also be general-purpose motors.
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