Open AccessMinimisation of torque ripple in slotless axial flux BLDC motors in terms of design considerations
Author(s) -
Pahlavani Mohammad R.A.,
Ayat Yusef Shahbazi,
Vahedi Abolfazl
Publication year - 2017
Publication title -
iet electric power applications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.815
H-Index - 97
eISSN - 1751-8679
pISSN - 1751-8660
DOI - 10.1049/iet-epa.2016.0754
Subject(s) - torque ripple , control theory (sociology) , torque , finite element method , computation , ripple , direct torque control , lorentz force , computer science , physics , engineering , magnetic field , induction motor , electrical engineering , structural engineering , algorithm , voltage , control (management) , artificial intelligence , thermodynamics , quantum mechanics
This study presents an analytical method to calculate instantaneous electromagnetic torque in slotless axial flux brushless DC (BLDC) motors. This method is based on Lorentz force theorem and using phase induced back electro‐magnetic force (EMF) and phase current. A new analytical method was introduced to compute induced back EMF. 3D finite element computations validate the proposed method. This method requires much less computation time than conventional 3D finite elements, and is therefore suitable for optimisation purposes. Due to practical limitation, phase current approximated by the trapezoidal function. Torque ripple dependency on design parameters was studied and optimum parameters were extracted for slotless axial flux BLDC motor.