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Machines, Volume 2, Issue 3 (September 2014), Pages 158-218

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Research

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Open AccessArticle Influence of Control Structures and Load Parameters on Performance of a Pseudo Direct Drive
Machines 2014, 2(3), 158-175; doi:10.3390/machines2030158
Received: 10 February 2014 / Revised: 23 June 2014 / Accepted: 30 June 2014 / Published: 4 July 2014
Cited by 2 | PDF Full-text (498 KB) | HTML Full-text | XML Full-text
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
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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. Full article
(This article belongs to the Special Issue Advances in Control Engineering)
Open AccessArticle Limit Cycles in Nonlinear Systems with Fractional Order Plants
Machines 2014, 2(3), 176-201; doi:10.3390/machines2030176
Received: 31 March 2014 / Revised: 9 June 2014 / Accepted: 1 July 2014 / Published: 17 July 2014
Cited by 2 | PDF Full-text (817 KB) | HTML Full-text | XML Full-text
Abstract
In recent years, there has been considerable interest in the study of feedback systems containing processes whose dynamics are best described by fractional order derivatives. Various situations have been cited for describing heat flow and aspects of bioengineering, where such models are believed
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In recent years, there has been considerable interest in the study of feedback systems containing processes whose dynamics are best described by fractional order derivatives. Various situations have been cited for describing heat flow and aspects of bioengineering, where such models are believed to be superior. In many situations these feedback systems are not linear and information on their stability and the possibility of the existence of limit cycles is required. This paper presents new results for determining limit cycles using the approximate describing function method and an exact method when the nonlinearity is a relay characteristic. Full article
(This article belongs to the Special Issue Advances in Control Engineering)
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Review

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Open AccessReview Design Analysis of a Novel Synchronous Generator for Wind Power Generation
Machines 2014, 2(3), 202-218; doi:10.3390/machines2030202
Received: 1 May 2014 / Revised: 15 July 2014 / Accepted: 5 August 2014 / Published: 18 August 2014
Cited by 1 | PDF Full-text (1448 KB) | HTML Full-text | XML Full-text
Abstract
A novel synchronous generator is proposed for wind power generation. The field flux is generated by the half-wave rectified excitation method. The generator does not require slip rings and brushes for field power supply, as well as permanent magnets. In this paper, the
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A novel synchronous generator is proposed for wind power generation. The field flux is generated by the half-wave rectified excitation method. The generator does not require slip rings and brushes for field power supply, as well as permanent magnets. In this paper, the excitation method is explained, and then, the basic characteristics are calculated using the finite element method analysis. Furthermore, the generator is designed for increasing the output power and efficiency. Full article
(This article belongs to the Special Issue Advances in Machinery for Renewable Power Generation)
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