No-load field characterisation of a sine-wave-filtered variable-frequency drive feeding an electrical submersible induction motor through a 6000 m cable
This paper presents full-scale field measurements on a 45 kW submersible induction motor fed through a 6000 m cable, demonstrating that while a sine-wave filter effectively cleans PWM voltage, the long cable significantly reduces terminal voltage and induces magnetic de-saturation that lowers no-load current, highlighting critical design considerations for deep-well variable-frequency drive systems.