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<p>A Novel Approach for sensorless control of BLDC motor-driven underwater thruster using variable inductance property is presented in this paper. The approach is proposed based on peaks and valleys of the stator winding inductance, the occurrence of which is shown to correspond to commutation instants required for operation. The paper conceptualizes the approach based on finite element studies of the motor geometry and presents a simulation exercise to demonstrate that the triggering points correspond to peak or valley points of the rotor position-dependent inductance of a BLDC motor. The measurement of online inductance is further demonstrated with real-time hardware. A sensorless control scheme based on detecting the inductance variation is demonstrated through simulation studies and tested by laboratory hardware with an industrial underwater three-phase BLDC motor-driven thruster meant for deep-water submersibles and underwater systems.</p>

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Sensorless Control of BLDC Motor Driven Thruster for Submersible Systems - A Novel Approach Using Inductance Variation

  • 期刊论文

  • 发表日期：

    2026年4月7日

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  • AN Subramanian,
  • Krishna Vasudevan,
  • M. A. Atmanand,
  • G. A. Ramadass

摘要

A Novel Approach for sensorless control of BLDC motor-driven underwater thruster using variable inductance property is presented in this paper. The approach is proposed based on peaks and valleys of the stator winding inductance, the occurrence of which is shown to correspond to commutation instants required for operation. The paper conceptualizes the approach based on finite element studies of the motor geometry and presents a simulation exercise to demonstrate that the triggering points correspond to peak or valley points of the rotor position-dependent inductance of a BLDC motor. The measurement of online inductance is further demonstrated with real-time hardware. A sensorless control scheme based on detecting the inductance variation is demonstrated through simulation studies and tested by laboratory hardware with an industrial underwater three-phase BLDC motor-driven thruster meant for deep-water submersibles and underwater systems.