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Machines 2014, 2(3), 158-175; doi:10.3390/machines2030158

Influence of Control Structures and Load Parameters on Performance of a Pseudo Direct Drive

1
Magnomatics Ltd, Park House, Bernard Road, Sheffield S2 5BQ, UK
2
Department of Electronic and Electrical Engineering, The University of Sheffield, Mappin Street, Sheffield S1 3JD, UK
*
Author to whom correspondence should be addressed.
Received: 10 February 2014 / Revised: 23 June 2014 / Accepted: 30 June 2014 / Published: 4 July 2014
(This article belongs to the Special Issue Advances in Control Engineering)

Abstract

The paper describes an in-depth and systematic analysis of a pseudo direct drive permanent magnet machine in closed loop control. Due to the torque being transmitted from the high-speed rotor (HSR) to the low-speed rotor (LSR), through a relatively low stiffness magnetic gear with non-linear characteristics, speed oscillations appear in the drive output with a conventional proportional integral (PI) controller. Therefore two candidate controllers have been proposed as an alternative to the PI control and all controllers have been optimally tuned with a genetic algorithm against a defined criterion. Furthermore, closed loop models are established in the complex frequency domain to determine the system damping and the cause of the oscillations. Consequently, the best controller structure that improves the dynamic behaviour of the system in terms of speed tracking and disturbance rejection could be identified, based on the frequency domain analysis. Experimental results are presented to validate the analysis and the proposed control technique.
Keywords: permanent magnet machines; electric drives; genetic algorithm; stability; state feedback controller; pseudo direct drive; PDD permanent magnet machines; electric drives; genetic algorithm; stability; state feedback controller; pseudo direct drive; PDD
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Bouheraoua, M.; Wang, J.; Atallah, K. Influence of Control Structures and Load Parameters on Performance of a Pseudo Direct Drive. Machines 2014, 2, 158-175.

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