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Principles Of Enhanced Heat Transfer

Traction motors play a critical role in electrified vehicles, including electric, hybrid electric, and plug-in hybrid electric vehicles. With high efficiency and power density, interior permanent magnet (IPM) synchronous machines have been employed in many commercialized electrified powertrains. In this paper, three different IPM rotor design configurations, which have been used in electrified powertrains from Toyota, Nissan, and General Motors, are comparatively investigated. Each topology is redesigned and improved to meet new design requirements based on the same constraints. The designed motors are then compared and comprehensively evaluated for motor performance, torque segregation, demagnetization, mechanical stress, and radial forces. The results suggest that the single V-shaped configuration achieves the best overall performance and is thus recommended as the best candidate.

Design and Comparison of Interior Permanent Magnet Motor Topologies for Traction Applications

Temperature can be measured via a diverse array of sensors. All of them infer temperature by sensing some change in a physical characteristic. Six types with which the engineer is likely to come into contact are: thermocouples, resistance temperature devices (RTD’s and thermistors), infrared radiators, bimetallic devices, liquid expansion devices, and change-of-state devices. It is well to begin with a brief review of each.

http://ieeexplore.ieee.org/iel5/11113/35628/01689588.pdf

Temperature measurement

Corona discharge refers to the phenomenon when the electric field near a conductor is strong enough to ionize the dielectric surrounding it but not strong enough to cause an electrical breakdown or arcing between conductors or other components. This phenomenon is unwanted and dangerous in high-voltage systems; however, a controlled corona discharge may be used to ionize a fluid and induce motion by directly converting the electrical energy into kinetic energy. Phenomena that involve the direct conversion of electrical energy into kinetic energy are known as electrohydrodynamic (EHD) and have a variety of possible applications today. This paper contains a literature review of the research regarding the EHD effects associated with corona discharges, from the first observation of the phenomenon to the most recent advancements on its mathematical modeling, as well as the advancements on specific applications, such as thrust, heat transfer improvement, boundary layer enhancement, drying, fluid pumping, and cooling.

https://bura.brunel.ac.uk/bitstream/2438/12965/1/Fulltext.pdf

Review on the History, Research, and Applications of Electrohydrodynamics

In an electrical machine design, thermal management plays a key role in improving the performance and reducing size End-windings are commonly identified as the machine hot-spot Hence, lowering and predicting end-windings temperature are crucial tasks in thermal management of electrical machines This paper proposes and investigates a noninvasive but effective cooling method that aims for a uniform cooling of a machine's winding by implementing direct cooling on its end-windings Modeling and experimental results show that a 25% hot-spot temperature reduction on a particular application can be achieved To analyze the proposed technique in detail, an accurate but computationally economic lumped parameter thermal network is developed Comparison between a “standard” thermal network and its simplified equivalent (with less nodes) is presented where the models are developed and fine-tuned based on experimental data All the above is used to investigate the potential of the proposed end-winding cooling method with different configurations of the methodology

/pdf/improved-thermal-management-and-analysis-for-stator-end-4yy6nmasbw.pdf

Improved Thermal Management and Analysis for Stator End-Windings of Electrical Machines

Electric machines have broadly been used in many industries including the transportation industry. With the evolving trend of electrification in transportation, electric machines with higher power density and higher efficiency are demanded and, thus, more stringent thermal management requirements are needed for electrified vehicle applications. This study comprehensively presents various important aspects of thermal management in electric machines with the main focus on transportation applications. Design considerations, challenges, and methods for enhanced thermal management are discussed. Fundamental thermal properties of common materials are presented and sources of losses in various parts of machines are explained. Furthermore, typical cooling techniques and thermal analysis approaches for electric machines are reviewed in detail. This study will serve as a reference guideline for machine designers, who are interested in thermal management, and for thermal researchers working on electric machines.

https://ietresearch.onlinelibrary.wiley.com/doi/pdf/10.1049/iet-est.2015.0050

Hossam Sadek

Papers

Thermal management of electric machines

Melting performance enhancement in latent heat storage module using solid extraction electrohydrodynamics (EHD)

Electrohydrodynamic enhancement of in-tube convective condensation heat transfer

An improved transient plane source technique and methodology for measuring the thermal properties of anisotropic materials

Facilitating Transactions for Health Applications Designed for Mobile Devices