When the power frequency motor is driven by frequency converter, the current of the motor will increase by 10-15%, and the temperature rise will increase by about 20-25%.

When using frequency converter to control high-speed motor, more high-order harmonics will be generated.

These high-order harmonics will increase the output current of the frequency converter.

Therefore, when choosing the frequency converter, it should be one gear larger than the ordinary motor.

Compared with the ordinary squirrel cage motor, the wound motor is prone to overcurrent tripping, so the frequency converter with slightly larger capacity than the usual should be chosen.

When the frequency converter is used to drive the gear deceleration motor, the application range is limited by the lubrication mode of the gear rotation part.

The risk of running out of oil may occur when the rated speed is exceeded.

The current value of the motor is used as the basis for the selection of the frequency converter, and the rated power of the motor is only for reference.

The output of the frequency converter contains rich high-order harmonics, which will reduce the power factor and efficiency of the motor.

If the frequency converter wants the long cable to run, the influence of the cable on the performance should be considered, and the special cable should be selected if necessary.

In order to make up for this problem, the frequency converter should enlarge one or two gear selection.

Compared with the power frequency power supply, when the frequency converter drives the synchronous motor, the output capacity will be reduced by 10 / 20%.

For compressors, vibrators and other loads with large torque fluctuation and peak loads such as oil pressure pumps, we should fully understand the operation of power frequency and choose a larger frequency converter.

Special occasions such as high temperature, frequent switching and high altitude will make the capacity of the frequency converter rain. It is recommended that the frequency converter should be selected according to the first stage o

f amplification.

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