Basic characteristics of inverter transmission - Reynolds

Create Date: 2024-8-30 12:03:23|Source: RENLE/RENOLDS

Compared with the motor driven by the inverter, the power factor and efficiency of the motor will deteriorate and the temperature rise will increase because the output waveform of the inverter contains the influence of higher harmonics. On the other hand, in order to obtain the same torque as that of the power frequency power supply, the fundamental rms value of the output current of the inverter is generally equal to the rms value of the power frequency power supply. The output current of the inverter is composed of the superposition of the basic current and the higher harmonic current. Therefore, the basic characteristics of the motor when the inverter is driven will be different from the power frequency power supply.

Basic characteristics of inverter transmission - Reynolds

Basic characteristics of inverter transmission - Reynolds

In general, when the motor is running extra, the motor current supplied by the inverter is about 5%-10% higher than that of the motor powered by the power frequency, and the temperature rise is increased by 20%. Therefore, when the inverter is supplied with electricity, the inverter motor should not run at full load at additional frequencies.

In addition, because ordinary motors are cooled by a cooling fan mounted on the motor shaft, when running at low speeds continuously, the motor will overheat due to the lack of cooling capacity of the cooling fan. In order to solve this problem, the following countermeasures can be taken:

1. Equip the motor with a cooling fan, and change the self-cooling method to another cooling method to add cooling ability.

2. Pick an electric motor with a larger capacity.

3. Improve the insulation level of the motor to achieve the intention of increasing the upper limit of the temperature rise of the motor.

4. Use a special motor for inverter instead.

5. Control the operating range of the motor to prevent long-term operation at low speed.

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