The impact of inverter cable design on the life of the motor and cable - Delixi

Create Date: 2024-8-30 12:03:23|Source: Delixi

Reflected waves caused by a cable-motor impedance mismatch are prevalent in all AC VFD uses. The severity of the problem depends on the length of the cable, the rise time of the PWM (Pulse Width Modulation) carrier, the voltage of the VFD, and the magnitude of the impedance difference between the motor and the cable.

  ​                           The impact of inverter cable design on the life of the motor and cable - Delixi

Under the right conditions, pulses from the VFD can increase the pulses reflected back from the motor, causing the voltage level to double, which can damage the cable or components within the drive. The solution was to insulate with XLPE cables, a material with a high level of impulse voltage breakdown. This makes the system more immune to the failure of reflected waves and voltage spikes in VFD use than PVC materials that are not recommended in these uses.

The impedance of the cable in relation to the motor will be the primary mechanism outlined in this article. This is done because the length of the cable depends primarily on the layout used, and the rise time varies with the output semiconductor of the VFD, and the voltage of the VFD is determined by the use.

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