Apa yang menyebabkan arus tidak merata pada motor VFD?

Apa pertanyaan dari teman :

Motor listrik 185kW, ditenagai oleh inverter 220kW, motor listrik beroperasi dengan arus fase U sekitar setengah dari fase V dan fase W, berfungsi dengan baik, dan berbunyi alarm beberapa kali sehari!

Ketika fasa U diubah menjadi fasa V, arus fasa V kembali menjadi sekitar setengah dari fasa U dan W.

Mengenai masalah arus tidak merata pada motor tiga fasa,

yang ditemui baik dalam penggunaan maupun pengujian, kita dapat menyaringnya dengan mengubah kondisi. Demi pemahaman, kita akan mulai dengan analisis motor frekuensi industri.

Jika arusnya tidak merata, kita bisa mendeteksinya melalui tegangan input, sehingga kita bisa membedakan apakah itu masalah catu daya atau masalah motor.

If the power supply voltage is uneven, we can exclude the electric motor problem; on the contrary, if the voltage is not a problem, we can determine that it is a electric motor problem.

If it is not convenient to measure the voltage, it can be judged by inverting the phase.

If the current is abnormal after inverting the phase and shifting with the inverted phase, it is generally a power supply problem, otherwise, it is an electric motor problem.

As for the VFD motor, the inverter is added between the power supply and the motor, and the abnormality of the inverter can also lead to abnormal operation.

We can make a basic judgment by the balance of the inverter input and output voltage, but also by replacing the inverter or disconnecting the inverter measures to the screen.

As far as the motor itself is concerned, when there is a serious imbalance in the three-phase current, the motor winding temperature will rise significantly, accompanied by the abnormal sound.

Thus, for motors powered through inverters, when there are data abnormalities, it is possible that there is a problem with the variable power supply or a problem with the data feedback system.

The common faults of inverters are divided into main circuit faults and auxiliary control circuit faults.

Among them, main circuit faults include rectifier block damage, charging resistor damage and inverter module burnout; auxiliary control circuit faults include drive circuit faults, switching power supply damage and feedback, detection circuit faults, etc.

Semua kesalahan ini akan menyebabkan catu daya dan umpan balik motor yang tidak normal.

Sangat penting untuk menemukan produsen motor listrik profesional untuk menghemat waktu.