What should you pay attention to when selecting a frequency converter for the motor?

Do you know? What should you watch out for when selecting a drive for the motor? Let the Dalan oil pump motor tell you!
Do you know? What should you watch out for when selecting a drive for the motor? Let the Dalan oil pump motor tell you! The specific considerations are as follows:

1. When selecting the inverter, the actual motor current value should be used as the basis for the inverter selection. The rated power of the motor can only be used as a reference.

2. It should be fully considered that the output of the inverter is rich in high-order harmonics, which will deteriorate the power factor and efficiency of the motor.

3. When the inverter is used to supply power to the motor and compared with the power supply of the power frequency grid, the current of the motor will increase by 10%, and the temperature rise will increase by about 20%. Therefore, when selecting the motor and the inverter, this situation should be taken into consideration, and a margin should be left to prevent the temperature rise from being too high and affect the service life of the motor.

4. If the inverter is to run with a long cable, measures should be taken to suppress the influence of the long cable to the ground coupling capacitor to avoid insufficient output of the inverter. Therefore, the inverter should be amplified by one or two gears or an output reactor at the output of the inverter.

5. For some special applications, such as high ambient temperature, high switching frequency, high altitude, etc., this will cause the inverter to derate, and the inverter needs to be enlarged for one gear.

6. When using a frequency converter to control a high-speed motor, because the reactance of the high-speed motor is small, more high-order harmonics are generated. These higher harmonics will increase the output current of the inverter. Therefore, when selecting a frequency converter for a high speed motor, it should be slightly larger than the inverter of a normal motor.

7. When the inverter is used to drive the gear reduction motor, the scope of use is restricted by the lubrication method of the rotating part of the gear.

8. When the lubricating oil is lubricated, there is no limit in the low speed range; in the high speed range exceeding the rated speed, there is a danger that the lubricating oil will be used. Therefore, do not exceed the maximum speed tolerance.

9. When the inverter drives the wound rotor asynchronous motor, most of the existing motors are used. The winding motor has a lower impedance of the winding motor winding than a conventional squirrel cage motor. Therefore, an overcurrent trip due to ripple current is prone to occur, so select a converter that is slightly larger than the normal capacity.

10. Generally, the winding motor is mostly used in the case where the flywheel torque GD2 is large, so pay more attention when setting the acceleration/deceleration time.

11. When the inverter drives the synchronous motor, it will reduce the output capacity by 10%~20% compared with the commercial frequency power supply. The continuous output current of the inverter is greater than the product of the rated current of the synchronous motor and the standard value of the synchronous pull-in current.

12. For a load with a large torque ripple such as a compressor or a vibrating machine, and a peak load with a hydraulic pump, if the inverter is selected according to the rated current or power value of the motor, overcurrent protection may occur due to the peak current. Action phenomenon. Therefore, you should understand the power frequency operation and select the inverter with a rated output current greater than its maximum current.

13. When selecting the inverter, be sure to check whether the protection level matches the situation on site. Otherwise, dust and water vapor on the site will affect the long-term operation of the inverter.








----- Editor-in-Chief: Dalan Oil Pump Motor 02-Procurement Consultant

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