<p>This paper aims to propose a novel axial-flux eddy-current clutch structure capable of compact integration into automotive transmissions with high power density. The proposed structure benefits from pure electromagnetic linkages with no frictional contact among its torque transferring components, providing longer life and durability. Different from clutch structures having permanent magnets, it can precisely control the engagement torque between its salient-pole primary-rotor and its induction-disc secondary-rotor, by adjusting the DC current of a stationary field-winding in its stator. To investigate the clutch performance, a semi-analytical performance prediction model is established and coded in MATLAB software by employing the functions of its PDE toolbox. Besides, the distribution of induced eddy currents across the secondary-rotor disc is calculated by establishing an innovative inner model, in which the disc is considered as a set of numerous parallel-connected fictitious narrow bars. The validity of the inner model is also verified by a 3D finite-element analysis, through JMAGDesigner software. Moreover, a 200 W prototype is fabricated and examined to demonstrate the accuracy of the established model and the appropriate performance of the proposed clutch structure.</p>

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A Semi-analytical Performance Prediction Model for a Brushless Controllable Eddy-Current Clutch

  • Hassan Mohammadi Pirouz,
  • Mohammadreza Baghayipour,
  • Somaye Rezaei

摘要

This paper aims to propose a novel axial-flux eddy-current clutch structure capable of compact integration into automotive transmissions with high power density. The proposed structure benefits from pure electromagnetic linkages with no frictional contact among its torque transferring components, providing longer life and durability. Different from clutch structures having permanent magnets, it can precisely control the engagement torque between its salient-pole primary-rotor and its induction-disc secondary-rotor, by adjusting the DC current of a stationary field-winding in its stator. To investigate the clutch performance, a semi-analytical performance prediction model is established and coded in MATLAB software by employing the functions of its PDE toolbox. Besides, the distribution of induced eddy currents across the secondary-rotor disc is calculated by establishing an innovative inner model, in which the disc is considered as a set of numerous parallel-connected fictitious narrow bars. The validity of the inner model is also verified by a 3D finite-element analysis, through JMAGDesigner software. Moreover, a 200 W prototype is fabricated and examined to demonstrate the accuracy of the established model and the appropriate performance of the proposed clutch structure.