The Use of Phase Change Material for the Cooling of Electric Machine Windings Formed with Hollow Conductors

“…The investigation on an induction motor and a PM motor revealed that placing a water jacket at the slot opening produced better thermal performance due to the proximity of the coolant to the machine's hotspots. Figure 13 shows the schematic of hollow conductors developed in [37], in which the phase change material (PCM) was placed inside the hollow conductors. Because of the significant capability of transferring energy of PCM, this technique resulted in a reduction of 8% in winding temperature increases and a 18% decrease in winding weight.…”

Section: Embedded Heat Pipe Coolingmentioning

confidence: 99%

“…The problem of this design is that the integrated cooling channel increases the bending radius of the windings, which makes the end-windings very long and leads to a winding proportion that is not useful accordingly. Figure 13 shows the schematic of hollow conductors developed in [37], in which the phase change material (PCM) was placed inside the hollow conductors. Because of the significant capability of transferring energy of PCM, this technique resulted in a reduction of 8% in winding temperature increases and a 18% decrease in winding weight.…”

Section: Embedded Heat Pipe Coolingmentioning

confidence: 99%

Advances in Thermal Management Technologies of Electrical Machines

Wang

Wu²,

Niu

et al. 2022

Energies

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Given the fact that the operation of electrical machines generates various loss components that finally become heat, developing advanced thermal management technologies is essential to control temperature increases and to guarantee safe operations. Meanwhile, the armature winding can stand larger currents when the machines are equipped with advanced cooling systems, which directly improves torque/power densities. This paper aims to provide a systematic review of the latest developments of advanced thermal management technologies of electrical machines. According to different heat dissipation mechanisms, the cooling systems studied in this paper are categorized into five major types: enclosed housing cooling, enhanced conductive cooling, embedded heat pipe cooling, direct oil cooling, and enhanced rotor cooling. The advantages and disadvantages of these cooling systems are researched and compared comprehensively. This study contributes to the revelation of insights on the thermal management of electrical machines and offers good guidance for the thermal management of electrical machines.

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“…A typical electrical application of copper hollow conductors is as stator windings of electrical machines, commonly operated in the generator mode. Such generators can be found in various range of applications, from aircrafts, where the coolant is the phase change material [12], [13], pumpedstorages and nuclear power plants [14]- [16], to evaporative cooling hydrogenerators of several hundreds of MWs of nominal power [17], [18]. This testifies about the advantages of using tubes as conductors, especially having in mind the increased power density.…”

Section: Introductionmentioning

confidence: 99%

Copper Pipes as Medium Frequency Transformer Windings

Djekanovic

Dujić

2022

IEEE Access

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Owing to increasing power demand, new technologies, such as solid-state transformers, are progressively researched and improved. Thereby, galvanic isolation and voltage adaptation are achieved by medium frequency transformers. To reach high power density designs, transformer windings can be realized by means of copper pipes, allowing for efficient liquid cooling. This paper provides insight to many relevant aspects for the use of hollow copper conductors as windings. This includes electrical and thermal modeling, as well as considerations regarding mechanical implementations. Additionally, the winding concept is investigated based on a 1 MW medium frequency transformer prototype.INDEX TERMS Medium-frequency transformer windings, hollow conductors, internal water cooling, oil insulation.

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The Use of Phase Change Material for the Cooling of Electric Machine Windings Formed with Hollow Conductors

Cited by 19 publications

References 11 publications

A critical review on thermal management technologies for motors in electric cars

A critical review on thermal management technologies for motors in electric cars

Advances in Thermal Management Technologies of Electrical Machines

Copper Pipes as Medium Frequency Transformer Windings

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