In addition, it is unscientific to select the inverter body alone, without considering whether the inverter selection and capacity matching are appropriate. This will be covered in the following article
1. Select the inverter according to the load characteristics
Second, when selecting the inverter, the actual motor current value should be used as the basis for the selection of the inverter, and the rated power of the motor can only be used as a reference. Secondly, it should be fully considered that the output of the inverter contains higher harmonics, which will cause the power factor and efficiency of the motor to deteriorate.
3. When the inverter wants to run with a long cable, the inverter should be enlarged by one gear or the output reactor should be installed at the output end of the inverter.
Fourth, when the inverter is used to control several motors connected in parallel, it must be considered that the sum of the length of the cable from the inverter to the motor is within the allowable range of the inverter.
5. For some special applications, such as high ambient temperature, high switching frequency, high altitude, etc., it will cause the derating of the inverter, and the inverter needs to be enlarged by one gear.
6. When choosing an inverter for a high-speed motor, it should be slightly larger than the inverter for an ordinary motor.
7. When the inverter is used in a pole-changing motor, full attention should be paid to the capacity of the inverter, so that the maximum rated current is below the rated output current of the inverter.
8. When driving the explosion-proof motor, the inverter does not have an explosion-proof structure, and the inverter should be set outside the dangerous place.
9. When the inverter is used to drive the gear reducer motor, the scope of use is restricted by the lubrication mode of the rotating part of the gear. Do not exceed the high speed tolerance.
10. When the inverter drives the wound rotor asynchronous motor, most of the existing motors are used. It is easy to overcurrent tripping due to ripple current, so it is necessary to choose an inverter with a slightly larger capacity than usual......
11. When the inverter drives the synchronous motor, the output capacity is reduced by 10%-20% compared with the power frequency power supply.
12. For loads with large torque fluctuations such as compressors and vibrating machines and peak loads such as hydraulic pumps, the power frequency operation should be understood, and the rated output current of the inverter with a larger current than its highest current should be selected.
13. When the inverter controls the roots fan, because its starting current is very large, we must pay attention to whether the capacity of the inverter is large enough when choosing the inverter.
14. When choosing an inverter, we must pay attention to whether its protection level matches the situation on site.
15. Single-phase motors are not suitable for inverter drive.
If there is only the high reliability of the inverter body, and the inverter selection and capacity matching are not appropriate, the frequency conversion speed regulation system composed of it cannot achieve high reliability, or even unable to operate, so how to ensure the normal and efficient operation of the frequency conversion adjustment system?
We want to make sure that the capacity of the drives is matched. First of all, according to the nature of the load, the correct type of inverter is selected. The general principle is what nature of the load characteristics with what characteristics of the inverter.
(1) Constant torque production equipment - within the speed regulation range, the load torque is basically constant. A frequency converter with constant torque performance should be selected. Its overload capacity is 150% and the rated current is maintained for 1 minute.
(2) Square torque production equipment - within the speed regulation range, the load torque is proportional to the square of the speed, that is, M∝n2, centrifugal fan, water pump is its typical representative. The inverter with M∝n2 characteristics has a small overload capacity, 110%-120% rated current overload for 1 minute,
(3) Constant power load production equipment - within the speed regulation range, the speed is low and the torque is large; The high speed and small torque, i.e. M? NC (constant). Typical equipment such as machine tools and winding mechanisms.
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