Jagathy Raj, V P; Praveen, R P; Ravichandran, M H; Sadasivan Achari, V T; Madhu, G; Bindu, G R(IEEE, May 3, 2009)
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Abstract:
This paper presents the design and analysis of a
400-step hybrid stepper motor for spacecraft applications. The
design of the hybrid stepper motor for achieving a specific
performance requires the choice of appropriate tooth geometry.
In this paper, a detailed account of the results of two-dimensional
finite-element (FE) analysis conducted with different tooth
shapes such as square and trapezoidal, is presented. The use of
% more
corresponding increase in detent torque and distorted static
torque profile. For the requirements of maximum torque density,
less-detent torque, and better positional accuracy and smooth
static torque profile, different pitch slotting with equal tooth
width has to be provided. From the various FE models subjected
to analysis trapezoidal teeth configuration with unequal tooth
pitch on the stator and rotor is found to be the best configuration
and is selected for fabrication. The designed motor is fabricated
and the experimental results is compared with the FE results
Description:
Electric Machines and Drives Conference, 2009. IEMDC'09. IEEE International
Jagathy Raj, V P; Praveen, R P; Ravichandran, M H; Sadasivan Achari, V T; Madhu, G; Bindu, G R; Dubas, F(IEEE, March 23, 2011)
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Abstract:
This paper presents the optimal design of a surface
mounted permanent-magnet (PM) Brushless direct-current
(BLDC) motor meant for spacecraft applications. The spacecraft
applications requires the choice of a motor with high torque
density, minimum cogging torque, better positional stability and
high torque to inertia ratio. Performance of two types of machine
configurations viz Slotted PMBLDC and Slotless PMBLDC with
Halbach array are compared with the help of analytical and
finite element (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 stiction
Description:
Emerging Trends in Electrical and Computer Technology (ICETECT), 2011 International Conference on