The impact of inverter cable design on the life of motor cables

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

Reflected waves that affect the impedance mismatch between the cable and the motor are pervasive in all AC VFD applications. 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 motor cables

Under the right conditions, pulses from the VFD can add pulses reflected back from the motor, causing the voltage level to double, which can damage the cable or components within the drive. The solution is to use XLPE cable insulation, which is 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 applications than PVC materials that are not recommended in these applications.

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

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