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Papers by Ahmad Syahid A. Fawzal
2018 XIII International Conference on Electrical Machines (ICEM), 2018
This document is the author's post-print version, incorporating any revisions agreed during the p... more This document is the author's post-print version, incorporating any revisions agreed during the peer-review process. Some differences between the published version and this version may remain and you are advised to consult the published version if you wish to cite from it. Φ Abstract-Low manufacturing cost and high reliability make the induction machine suitable for different constant and variable speed applications. For machines operating in hazardous environments, the fully enclosed type is used, with limited access to the stator and rotor. Indirect air cooling method is usually employed with fins casing and an attached fan. Thus, the fan design is crucial as being the only resource to remove heat away from the machine. A poor thermal management of the electrical machine can lead to a machine failure and reduce the machine lifespan. Some machines are operating for bi-directional operation, which means the performance of the machine should be reviewed under both conditions. This paper focus on the impact of the fan cooling on the thermal profile of a 5.5 kW induction machine under bidirectional operation. Comparative studies using CFD simulations have been carried out to identify the effect of different fan types when operating at particular conditions. The performed work provides an understanding of the air flow under bi-directional operation, which notes the importance of the fan design and rotational direction in induction machines.
Applied Thermal Engineering, 2018
Publisher: Elsevier NOTICE: this is the author's version of a work that was accepted for publicat... more Publisher: Elsevier NOTICE: this is the author's version of a work that was accepted for publication in Applied Thermal Engineering. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Applied Thermal Engineering, [130, (2017)]
IEEE Transactions on Industry Applications, 2017
This document is the author's post-print version, incorporating any revisions agreed during the p... more This document is the author's post-print version, incorporating any revisions agreed during the peer-review process. Some differences between the published version and this version may remain and you are advised to consult the published version if you wish to cite from it.
2016 XXII International Conference on Electrical Machines (ICEM), 2016
This document is the author's post-print version, incorporating any revisions agreed during the p... more This document is the author's post-print version, incorporating any revisions agreed during the peer-review process. Some differences between the published version and this version may remain and you are advised to consult the published version if you wish to cite from it.
The maximum power and torque of a Permanent Magnet (PM) machine may be limited by its magnets’ te... more The maximum power and torque of a Permanent Magnet (PM) machine may be limited by its magnets’ temperature. An operational temperature above the magnets’ threshold may cause demagnetization, particularly under abnormal conditions. For Axial Flux Permanent Magnet (AFPM) machines, the PMs are mounted on its rotor, therefore, one way to regulate the PM temperature is via an appropriate rotor cooling method. Selective designs of air inlet and outlet arrangement have been studied by the Computational Fluid Dynamics (CFD) analysis to assess and compare their flow and cooling capabilities. The new cooling designs were then implemented on a Yokeless and Segmented Armature (YASA) machine for flow experimental validation. Additionally, the cooling performance after the design implementation is analysed via CFD. This paper’s proposed cooling method is expected to lead to lower magnet temperatures, thus increased reliability, output power and efficiency.
The thermal management of an axial flux permanent magnet (AFPM) machine is essential because it d... more The thermal management of an axial flux permanent magnet (AFPM) machine is essential because it determines the machine's continuous power output and reliability. In this paper, a secondary cooling method is proposed using rotor cooling, which allows better thermal management on the permanent magnets that are attached to the rotor. This will reduce the potential of the machine failing due to magnet demagnetization and degradation. Thermal analysis via lumped parameter networks is usually sufficient in predicting the motor's thermal behavior. However, the accuracy of the prediction can be increased, especially for the devices with complex flow regions by computational fluid dynamics. In this study, the fan blade was attached to the rotor of a yokeless and segmented armature machine for flow validation and then three different fan blade designs from other engineering applications were tested. The evaluation includes the flow characteristic, power requirement, and thermal characteristic for the AFPM's rotor cooling applications. Additionally, the rotor cooling performance index is introduced to assess each fan design performance.
2018 XIII International Conference on Electrical Machines (ICEM), 2018
This document is the author's post-print version, incorporating any revisions agreed during the p... more This document is the author's post-print version, incorporating any revisions agreed during the peer-review process. Some differences between the published version and this version may remain and you are advised to consult the published version if you wish to cite from it. Φ Abstract-Low manufacturing cost and high reliability make the induction machine suitable for different constant and variable speed applications. For machines operating in hazardous environments, the fully enclosed type is used, with limited access to the stator and rotor. Indirect air cooling method is usually employed with fins casing and an attached fan. Thus, the fan design is crucial as being the only resource to remove heat away from the machine. A poor thermal management of the electrical machine can lead to a machine failure and reduce the machine lifespan. Some machines are operating for bi-directional operation, which means the performance of the machine should be reviewed under both conditions. This paper focus on the impact of the fan cooling on the thermal profile of a 5.5 kW induction machine under bidirectional operation. Comparative studies using CFD simulations have been carried out to identify the effect of different fan types when operating at particular conditions. The performed work provides an understanding of the air flow under bi-directional operation, which notes the importance of the fan design and rotational direction in induction machines.
Applied Thermal Engineering, 2018
Publisher: Elsevier NOTICE: this is the author's version of a work that was accepted for publicat... more Publisher: Elsevier NOTICE: this is the author's version of a work that was accepted for publication in Applied Thermal Engineering. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Applied Thermal Engineering, [130, (2017)]
IEEE Transactions on Industry Applications, 2017
This document is the author's post-print version, incorporating any revisions agreed during the p... more This document is the author's post-print version, incorporating any revisions agreed during the peer-review process. Some differences between the published version and this version may remain and you are advised to consult the published version if you wish to cite from it.
2016 XXII International Conference on Electrical Machines (ICEM), 2016
This document is the author's post-print version, incorporating any revisions agreed during the p... more This document is the author's post-print version, incorporating any revisions agreed during the peer-review process. Some differences between the published version and this version may remain and you are advised to consult the published version if you wish to cite from it.
The maximum power and torque of a Permanent Magnet (PM) machine may be limited by its magnets’ te... more The maximum power and torque of a Permanent Magnet (PM) machine may be limited by its magnets’ temperature. An operational temperature above the magnets’ threshold may cause demagnetization, particularly under abnormal conditions. For Axial Flux Permanent Magnet (AFPM) machines, the PMs are mounted on its rotor, therefore, one way to regulate the PM temperature is via an appropriate rotor cooling method. Selective designs of air inlet and outlet arrangement have been studied by the Computational Fluid Dynamics (CFD) analysis to assess and compare their flow and cooling capabilities. The new cooling designs were then implemented on a Yokeless and Segmented Armature (YASA) machine for flow experimental validation. Additionally, the cooling performance after the design implementation is analysed via CFD. This paper’s proposed cooling method is expected to lead to lower magnet temperatures, thus increased reliability, output power and efficiency.
The thermal management of an axial flux permanent magnet (AFPM) machine is essential because it d... more The thermal management of an axial flux permanent magnet (AFPM) machine is essential because it determines the machine's continuous power output and reliability. In this paper, a secondary cooling method is proposed using rotor cooling, which allows better thermal management on the permanent magnets that are attached to the rotor. This will reduce the potential of the machine failing due to magnet demagnetization and degradation. Thermal analysis via lumped parameter networks is usually sufficient in predicting the motor's thermal behavior. However, the accuracy of the prediction can be increased, especially for the devices with complex flow regions by computational fluid dynamics. In this study, the fan blade was attached to the rotor of a yokeless and segmented armature machine for flow validation and then three different fan blade designs from other engineering applications were tested. The evaluation includes the flow characteristic, power requirement, and thermal characteristic for the AFPM's rotor cooling applications. Additionally, the rotor cooling performance index is introduced to assess each fan design performance.