Single Phase Cutting Machine Motor Slow on 500m 2.5mm Cable—How to Increase Speed?

A single-phase cutting machine connected via a 500-meter long 2.5mm² cable experiences significant motor speed reduction due to voltage drop along the cable length. The voltage drop results in insufficient voltage supply to the motor, impairing cutting performance. Solutions discussed include using a current amplifier or a boost transformer to compensate for voltage loss without replacing the cable. Specifically, a buck-boost transformer such as the Dongan 85-M030 model can be employed to restore voltage to 120 or 240V at the load end. Calculating the required KVA rating and measuring voltage at the cable end are necessary for proper transformer selection and wiring. Another suggestion is adopting a step-up transformer at the source and a step-down transformer at the load to mimic high-voltage transmission principles. Switching to a three-phase motor with a variable frequency drive (VFD) was also mentioned as an alternative to tolerate voltage drops and control motor speed. However, the most straightforward solution remains shortening the cable or using thicker cable to reduce voltage drop.
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