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1 – 2 of 2Siavash Sadeghi and Leila Parsa
The purpose of this paper is to minimize the torque pulsation in Halbach array permanent magnet synchronous machines (PMSMs).
Abstract
Purpose
The purpose of this paper is to minimize the torque pulsation in Halbach array permanent magnet synchronous machines (PMSMs).
Design/methodology/approach
Because of its specific structure, the cogging torque influences the main part of the torque pulsation in a Halbach array PMSM. In this paper, first it is shown that the conventional magnet skewing method does not have a significant effect on the torque pulsation in this motor, and then an improved skewing method with fewer skewing steps is proposed. In this method permanent magnet segments are placed sinusoidally, with two‐step skewing along the rotor. Generalization with different combinations of slots and poles is considered for a Halbach array PMSM.
Findings
Using a detailed finite element method (FEM) it was found that with the proposed technique the cogging torque factor is reduced to as low as 8 percent, while the average value of the torque is maintained near the machine nominal average torque.
Practical implications
Halbach array PMSMs are very good candidates for high dynamic performance applications such as aerospace applications due to their high acceleration and deceleration features. This technique also resolves the mechanical vibration and acoustic noise issues, which are caused by torque pulsation and significantly affect machine performance.
Originality/value
The originality of this paper lies in the FEM results. Since Halbach array PMSMs have a special structure it was shown that the conventional skewing method does not work well for this machine. The new proposed technique has a significant effect on the torque pulsation.
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Ömer Sarı and Selma Meydan Uygur
Nation branding efforts are carried out by means of communication. The element, which is the object of communication tools, must have an analogical connection with nation…
Abstract
Purpose
Nation branding efforts are carried out by means of communication. The element, which is the object of communication tools, must have an analogical connection with nation branding. The object of analogy should have attractive features that will strengthen the nation brand. Online tourism content, which has the quality to add value to nation branding, can produce a strong analogy. Online tourism content can easily be internalized in a positive way, as it creates attractive connotations such as memories, entertainment, holidays, etc. in the mind of the audience. In this direction, the research aims to reveal that the online tourism brand is a strategic transmission tool of nation branding.
Design/methodology/approach
The research study was carried out with the semiotics method. Content analysis has been made for the videos of GoTürkiye, Turkey's tourism brand, on YouTube.
Findings
Research findings show that content covering a large part of Turkey has been created. Messages to be given in the content; it is that Turkey has authentic and attractive elements and hosts international events. The content on GoTürkiye's YouTube has reached a significant number of views.
Practical implications
The research aims to reveal how to build an online nation brand through online tourism brands. In this respect, it is thought that the results can guide the politicians or marketers responsible for nation branding.
Originality/value
The idea of how to build an online nation branding through online tourism brands remains unclear. In this respect, the research demonstrates its original value in proposing a model that will contribute to online nation branding.
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