'Institute of Electrical and Electronics Engineers (IEEE)'
Abstract
This paper presents the optimal design of a sur-
face mounted permanent magnet Brushless DC mo-
tor (PMBLDC) meant for spacecraft applications.
The spacecraft applications requires the choice of a
torques motor with high torque density, minimum
cogging torque, better positional stability and high
torque to inertia ratio. Performance of two types
of machine con¯gurations viz Slotted PMBLDC and
Slotless PMBLDC with halbach array are compared
with the help of analytical and FE methods. It is
found that unlike a Slotted PMBLDC motor, the
Slotless type with halbach array develops zero cogging
torque without reduction in the developed torque.
Moreover, the machine being coreless provides high
torque to inertia ratio and zero magnetic stictionCochin University of Science and TechnologyECTI TRANSACTIONS ON ELECTRICAL ENG., ELECTRONICS, AND COMMUNICATIONS VOL.9, NO.1 February 201
