Co-Rotational/Auto-Resistance Enhanced Single-End Segmented Rotor Induction Motor for Torpedo-Like Propulsion: High Starting Performance

Addressing the critical requirements for torpedo-like devices, specifically the need for high starting torque to overcome seabed sludge adhesion after prolonged underwater dormancy, enhanced operational reliability, and rapid transient response, this paper proposes a single-end segmented rotor induction motor based on the Co-Rotational/Auto-Resistance Enhancement Theory. The motor employs the magnetic-field complementarity principle in its stator winding design combined with an single-end segmented rotor structure. Its core operational principle enables the equivalent parallel operation of multiple motors with identical rotational directions but different pole pairs during startup while effectively increasing the referred rotor resistance to the stator side, thereby significantly improving the starting performance. Through an in-depth analysis of the working principles of the motor, equivalent circuits for their operational states were established and simulation models were developed. Comprehensive simulations and experimental studies have systematically validated key parameters, including the air-gap flux density, stator tooth flux density, current characteristics, and torque performance. The results demonstrate that the proposed design substantially improves the starting performance, structural reliability, and millisecond-level transient response while maintaining a steady-state performance comparable to that of conventional squirrel-cage induction motors of the same frame size, confirming its significant engineering application value.