Design considerations in an indirectly coupled multilevel motor controller

Pierce, Jordan, Walker, Geoff, Finn, David, & Sernia, Paul (2004) Design considerations in an indirectly coupled multilevel motor controller. In Australasian Universities Power Engineering Conference (AUPEC 2004), 26-29 September 2004, University of Queensland, Brisbane, Australia.


Permanent magnet (PM) motors utilising ironless stator structures have been incorporated into a wide variety of applications where high efficiency and stringent torque control are required. With recent developments in magnetic materials, improved design strategies, and power outputs of up to 40kW, PM motors have become an attractive candidate for traction drives in electric and hybrid electric vehicles. However, due to their large air gaps and ironless stators these motors can have inductances as low as 2μH, imposing increased requirements on the converter to minimise current ripple. Multilevel converters with n cells can effectively increase the motor inductance by a factor of n2 and are an excellent approach to minimise the motor ripple current. Furthermore by indirectly coupling the outputs of each cell, improvements in converter input and cell ripple current can also be realised. This paper examines the issues in designing a high current indirectly coupled multilevel motor controller for an ironless BLDC traction drive and highlights the limitations of the common ladder core structure.

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ID Code: 63561
Item Type: Conference Paper
Refereed: Yes
Divisions: Current > Schools > School of Electrical Engineering & Computer Science
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2004 [please consult the authors]
Deposited On: 11 Dec 2014 23:16
Last Modified: 11 Dec 2014 23:16

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