Pay attention to the problem when choosing an inverter - Mitsubishi Electric

Create Date: 2024-8-30 12:03:23|Source: Mitsubishi Electric/Mitsubishi Electric

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

                                  Pay attention to the problem when choosing an inverter - Mitsubishi Electric

Compared with the general squirrel cage motor, the winding motor simply has the problem of overcurrent tripping, and the inverter with a slightly larger capacity than usual should be selected.

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

When the inverter is used to drive the gear reducer motor, the application range is limited by the smooth way of the gear rolling part. When the rated speed is exceeded, the risk of running out of oil may occur.

Special occasions such as high temperature, frequent switching, high altitude and so on will make the capacity of the inverter drop rain, and it is recommended that the inverter be selected according to the expansion of one gear.

The output of the inverter contains abundant higher harmonics, which will reduce the power factor and efficiency function of the motor.

When the inverter wants to run with a long cable, the influence of the cable on the function should be considered, and a special cable should be selected if necessary. To compensate for this problem, the inverter should be expanded by one or two gears.

For loads with large torque fluctuations such as compressors and vibrating machines, and peak loads such as hydraulic pumps, we should fully understand the power frequency operation status and choose a higher inverter.

Compared with the power frequency power supply, the output capacity of the inverter will decrease by 10-20% when driving the synchronous motor.

When a high-speed motor is controlled by an inverter, a large number of high-order harmonics are generated. These higher harmonics will increase the output current value of the inverter. Therefore, when selecting the inverter, it should be one gear larger than the general motor.

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