New design methodologies for printed circuit axial field brushless dc motors

PhD Thesis


Gambetta, Daniele Morco. 2009. New design methodologies for printed circuit axial field brushless dc motors. PhD Thesis Doctor of Philosophy. University of Southern Queensland.
Title

New design methodologies for printed circuit axial field brushless dc motors

TypePhD Thesis
Authors
AuthorGambetta, Daniele Morco
SupervisorAhfock,Tony
Institution of OriginUniversity of Southern Queensland
Qualification NameDoctor of Philosophy
Number of Pages282
Year2009
Abstract

[Abstract]
A number of factors are contributing to the increased practical importance of printed circuit axial
flux brushless direct current (BLDC) machines. The main ones are the availability of low cost power electronic devices and digital controllers as well as cost effective high strength permanent magnets. Advancement of multi-layer printed circuit technology is also an important factor. Existing printed circuit board motors, found in applications such as computer disk drives and portable audio-visual equipment, are typically rated at a few watts per thousand revolutions per minute (krpm). The focus of this thesis project has been on printed circuit motors with ratings of a few tens of watts per krpm.

A significant part of this thesis project has been devoted to development of systematic design procedures for printed circuit stators. In particular those procedures include algorithms which allow performance comparisons of several stator coil shapes. A new coil shape, with improved
torque capability, has been developed. BLDC motors that operate in sensorless mode has advantages such as lower cost, better reliability and space saving. A new generalised version of the previously reported equal
inductance method has been developed which allows sensorless commutation of printed circuit BLDC motors down to zero speed and start-up with practically no back rotation.

Computer efficient numerical models have been developed to predict phase inductances and stator eddy-current loss. Sufficiently accurate phase inductance predictions make possible theoretical assessment of performance of motors under sensorless commutation control that is based on the equal inductance method. The proposed method of calculation of eddy current loss allows designers to determine the track width beyond which eddy current loss becomes excessive.

The mathematical model on which the enhanced equal inductance method is based and those that have been used for performance assessment, inductance prediction and eddy-current loss evaluation have all been validated by specially designed laboratory tests carried out on prototype motors.

Keywordsdesign methodologies; printed circuit axial field bushless direct current motors; printed circuit motors
ANZSRC Field of Research 2020400801. Circuits and systems
Byline AffiliationsFaculty of Engineering and Surveying
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Stator eddy-current losses in printed circuit brushless motors
Ahfock, A. and Gambetta, D.. 2011. "Stator eddy-current losses in printed circuit brushless motors." IET Electric Power Applications. 5 (1), pp. 159-167. https://doi.org/10.1049/iet-epa.2009.0203
Sensorless commutation of printed circuit brushless direct current motors
Ahfock, A. and Gambetta, D.. 2010. "Sensorless commutation of printed circuit brushless direct current motors ." IET Electric Power Applications. 4 (6), pp. 397-406. https://doi.org/10.1049/iet-epa.2009.0133
Designing printed circuit stators for brushless permanent magnet motors
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A new sensorless commutation technique for brushless DC motors
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