This article presents a novel use of three-dimensional printed direct winding heat exchangers (3-D-DWHX) to improve the thermal management stator in high power density electric machines. The 3-D-DWHX is contact with windings, enabling continuous current densities. dielectric polymer for exchanger allows windings without an additional insulation material. By occupying otherwise unused space between double layer concentrated there no significant impact on electromagnetic design, and smaller...

Direct winding oil cooling offers more effective than conventional alternatives and can therefore increase the torque density of electric machines; however, this technique is limited by thermophysical properties oil. The use a direct heat exchanger (DWHX) allows glycol-water coolant mixture to be used which leads significant improvement in transfer reduction pumping losses compared cooling. This paper proposed ceramic 3D printed exchangers (3D-DWHX) significantly improve concentrated...

Conventional electrical machine cooling includes housing fins, shaft-mounted fan, and water jacket. In these cases, heat from the copper loss of windings needs to pass through either stator core or air between housing. Because large thermal resistance in path, methods are sometimes not efficient enough for high torque density machines. Overheat causes failure insulation damages machine. Many technologies that facilitate winding have been investigated literature, such as topologies with more...

Integrated motor drives (IMDs) can provide high power density, simplified installation, and easier retrofits for fixed-speed motors with adjustable speed (ASDs) in pump/fan applications. This paper proposes a new IMD based on current-source inverter (CSI) topology that offers several performance improvements over existing configurations. Attention is focused development of suitable electronics modules have reverse-voltage-blocking (RB) switching frequency capabilities. Several candidate...

Direct cooling of the windings in a motor using oil offers more effective thermal management than conventional alternatives and can therefore increase torque density electric machines; however, this technique is limited by thermophysical properties oil. The use direct winding heat exchanger allows glycol-water coolant mixture to be used, which leads significant improvement transfer reduction pumping losses compared cooling. This article proposes ceramic 3-D printed exchangers (3D-DWHX),...

As the power density of electric machines increases, rotor thermal analysis becomes critical as losses caused by higher fundamental frequencies increase. The often has poor communication with stator cooling medium, and therefore alternative methods may be required in high to maintain safe operating temperature, especially mounted permanent magnet motors. In this paper, a review design considerations is discussed, along key tools used rotors for machines.

This paper presents the study on a novel dual-stator 6/4 flux-switching permanent magnet (FSPM) machine for high-speed applications. Three different alternative topologies of FSPM machines are proposed and their performances regarding flux linkage, back electromotive force (back-EMF), torque density, manufacturability compared to same specification 10 kW 15,000 rpm condition. Design considerations each topology elaborated. The is with conventional 12/10 designed at power speed rating....

The objective of this paper is to analyze a novel high-speed integrated motor-compressor drive system and investigate the opportunities by using gallium nitride (GaN)-based inverters. proposed combination electric machine axial-flow compressor shaping rotor pole into airfoils. Hence, can provide electromagnetic torque compression function at same time. As needs rotate high speed achieve ratio, challenges fundamental frequency are addressed. By leveraging GaN-based inverters, current...

This paper investigates the design and testing of a high-speed dual-stator 6/4 flux-switching permanent magnet (FSPM) machine. A is used to solve issue second harmonic presented in flux linkage conventional FSPM Different designs are investigated compared against each other terms performance manufacturability. Comparison between proposed FPSM machine commonly seen 12/10 done at 10 kW, 15000 rpm condition. Due 60% reduction fundamental frequency, significant iron loss eddy current observed,...

Organic white-light-emitting devices (OLEDs) based on a multimode resonant microcavity defined by pair of dielectric mirrors and metal were presented. By selective effects the quarter-wave stack mirror mode, white light emission containing three individual narrow peaks red, green blue was achieved, showed weak dependence viewing angle. The Commission Internationale De L'Eclairage (CIE) chromaticity coordinates changed from (0.29, 0.37) at 0° to (0.31, 0.33) 40°. Furthermore, brightness...

The surface permanent magnet (SPM) and flux-switching (FSPM) machines are good candidates for high power density high-speed applications. SPM FSPM share several similarities such as negligible reluctance torque equivalent air gap length. This paper gives a comprehensive comparison on the design of an eight pole dual-stator 6/4 at two different speeds. choice characteristics retaining sleeves in machine material, thickness, loss speeds discussed. Depending sleeve, can have severe thermal...

This paper presents a new study on the comparison of dual-rotor single-stator (DRSS) and dual-stator single-rotor (DSSR) axial flux-switching permanent magnet (AxFSPM) machines. The DRSS DSSR AxFSPM machines have same dimensions except for stator rotor yoke lengths. 3-D finite element analysis (FEA) experimental verification are used study. results show that machine reduces leakage flux in both airgap housing compare to machine. For this reason, achieves higher fundamental back-EMF average...

This paper focuses on the influence windage loss brought by different rotor structures of flux-switching permanent magnet machines. Ribs and shrouds are added to salient pole reduce loss. The baseline machine has a dual-stator/rotor structure, which introduces complications in evaluating with empirical methods. Computational fluid dynamics tool finite element analysis used evaluate characteristics electromagnetic performance types rotors, respectively. results show that is most effective...

The objective of this paper is to investigate the influence rotor pole thickness on combinations stator slots and poles in a novel integrated flux-switching motor-compressor. motor-compressor also an axial-flow compressor. Therefore, requirements are based both motor compressor performances. optimal slot determined considering electromagnetic thermodynamic winding connections machines different investigated. performances compared by analytical methods finite element analysis (FEA).

This paper presents a thermal study of novel highspeed dual-stator 6/4 FSPM machine. The machine is developed to provide viable solution for low pole machines at high speed conditions. However, the generates losses and heat dissipation crucial in keeping performance electric In this paper, aspects design are investigated. Critical model issue such as anisotropic conductivity, contact resistance discussed. lumped-parameter network (LPTN) first preliminary studies. Then finite element analysis...

In view of the increasing demand in torque density, this article propounds idea looking for an upper bound production and average shear stress surface permanent magnet (SPM) synchronous machines. The derivation is based on assumption infinite permeability iron core employs transfer relation between normal magnetic flux density tangential strength. result written as functions machine's major geometries excitation conditions. ratio actual value may be used a metric measuring usage materials'...

We have fabricated organic thin-film transistors using the small-molecule polycyclic aromatic hydrocarbon pentacene as an active material. Devices were on glass substrates by rf-magnetron sputtered amorphous aluminium gate electrode, and gelatinized polyimide dielectric with physical vapour grown thin films pasted it layer, then source drain contacts. Field effect mobility threshold voltage is 0.092 cm2/Vs 14.5 V, respectively. On–off current ratio nearly 103.

Single-layer winding structure is able to increase the factor of dual-stator 6/4 flux-switching permanent magnet (FSPM) machine compared conventional double-layer winding. The use toroidal in single-layer significantly reduces manufacturing complexity and risk turn-to-turn short. This paper investigates design performance winding, FSPM equipped with Because higher factor, topology can achieve same power smaller size or lower electric loading topology. In addition, shown have better field...

High-performance electric drive applications necessitate a high fidelity model to predict the terminal characteristics of machines in design stage fulfill system-level evaluation together with converters. This article interprets winding function theory (WFT) from field perspective and incorporates secondary effects, such as slotting iron nonlinearity into it accurately main flux linkage induction machines. The method is centered on resolving magnetic scalar potential two sides air gap...

The purpose of this paper is to propose a novel flux-switching permanent magnet machine (FSPM) with conical rotor. rotor has two degree-of-freedom movement, including axial and radial movements. movement realized by controlling the force generated d-axis current. During positive movements, air gap length reduced leads higher flux density increase torque production capability. negative due length, which creates an opportunity for improved flux-weakening compared normal FSPM machines. In...

This study investigates the thermal impact of using different winding topologies and encapsulation materials on dual‐stator 6/4 flux‐switching permanent magnet (FSPM) machine with water jacket cooling. The performance four design cases are compared lumped‐parameter network models. modelling heat transfer in stator slot, air gap channel presented. It is shown that FSPM machines circumferential toroidal have limiting components material has a two topologies. Prototype motors built tested to validate

Due to the increased switching speed and frequency of wide bandgap (WBG) device-based power electronics, common-mode (CM) electromagnetic interference (EMI) noise issue has been exacerbated in modern motor drive system. Understanding high-frequency impedance an electric is critical analyzing mitigating CM EMI issues. It also essential find dominant parasitic capacitances within machine, which serve as primary motor-to-ground current paths. This paper investigates impact two different winding...

We demonstrate high efficiency red organic light-emitting diodes (OLEDs) based on a planar microcavity comprised of dielectric mirror and metal mirror. The devices emitted light at peak wavelength 610 nm with full width half maximum (FWHM) 25 in the forward direction, an enhancement about 1.3 factor electroluminescent (EL) has been experimentally achieved respect to conventional noncavity devices. For structure distributed Bragg reflectors (DBR)/indium-tin-oxide(ITO)/V2O5/N,N'...

The rising demand for wide bandgap (WBG) devices and the growing need compact motor drives in electric vehicles (EVs) have escalated challenges associated with common-mode (CM) current, electromagnetic interference (EMI) EV drives. This article investigates impact of concentrated winding (CW) toroidal windings (TW) on CM current. prototype CW TW motors are analyzed, dominant winding-to-ground capacitances identified. High-frequency impedance models up to 30 MHz developed used estimate...