Slotless PM machines with skewed winding shapes:3D electromagnetic modeling

The 3D modeling technique presented in this paper, predicts, with high accuracy, electromagnetic fields and corresponding dynamic effects in conducting regions for rotating machines with slotless windings, e.g. self-supporting windings. The presented modeling approach can be applied to a wide variety of slotless winding configurations, including skewing and/or different winding shapes. It is capable to account for induced eddy-currents in the conductive rotor parts, e.g. permanent magnet eddy-current losses, albeit not iron and winding AC losses. The specific focus of this paper is to provide the reader with the complete implementation and assumptions details of such a 3D semi-analytical approach, which allows model validations with relatively short calculation times. This model can be used to improve future design optimizations for machines with 3D slotless windings. It has been applied, in this paper, to calculate fixed parameter Faulhaber, Rhombic, and Diamond slotless PM machines to illustrate accuracy and applicability

FEATURES OF PLATELET MORPHOLOGY IN PATIENTS WITH SIALOSIS

Various methods of diagnosing diseases of the salivary glands do not fully meet the requirements of doctors to make a final decision on the choice of treatment for various diseases of the salivary glands, as result of which patients receive untimely or inadequate care. In these cases, the long course of the disease leads to the development of complications, the treatment of which presents significant difficulties. Therefore, a thorough collection of anamnesis and a comprehensive examination of patients with sialosis are a prerequisite for making a final diagnosis

High-speed slotless permanent magnet machines: modelling and design frameworks

This paper presents a design framework for high-speed slotless permanent magnet machines based on extended harmonic modeling (HM) technique to predict various electromagnetic properties and torque distribution. The developed models for generic design framework are able to evaluate slotless PM machines' topologies with a wide range of 3D slotless windings, (including those with skewing), and can be also used for future design optimization routines

Design of an Axial-Flux permanent magnet machine for an in-wheel direct drive application

This paper concerns the optimization and comparison of six different axial-flux permanent magnet (AFPM) machine topologies for an in-wheel direct drive application. The objective of the optimization is to reach maximum power density, which is of essence for an in-wheel motor. The machine topologies are optimized using the 3D analytical charge model in combination with a thermal equivalent circuit model for calculation of the temperature rise and thermal dependency of the main electromagnetic losses. All investigated AFPM machine topologies are variations of the internal stator twin external rotor AFPM machine. The resulting designs are compared based on their power density, weight, efficiency, and permanent magnet volume. The distributed winding topology with a quasi-Halbach magnet arrangement shows the best performance within the optimization problem

Design of an axial-flux permanent magnet machine using the 3-D magnetic charge model

This paper concerns the optimization and comparison of six different axial-flux permanent magnet (AFPM) machine topologies for an in-wheel direct drive application. The objective of the optimization is to reach maximum power density, which is of essence for an in-wheel motor. The machine topologies are optimized using the 3D analytical charge model in combination with a thermal equivalent circuit model for calculation of the temperature rise and thermal dependency of the main electromagnetic losses. All investigated AFPM machine topologies are variations of the internal stator twin external rotor AFPM machine. The resulting designs are compared based on their power density, weight, efficiency, and permanent magnet volume. The distributed winding topology with a quasi-Halbach magnet arrangement shows the best performance within the optimization problem

Design and comparison of high-frequency resonant and non-resonant rotating transformers

This paper concerns the design and comparison of resonant and non-resonant high-frequency rotating transformers. The transformers are modeled and designed using coupled magnetic, electrical, and thermal models. The models are experimentally verified. Two different design optimizations are conducted, first two standard core geometries are optimized such that, the efficiency is maximized for a required output power. Second, a geometrical optimization is performed, such that the core volume is minimized for the desired output power. The results of both optimizations have indicated large improvements in terms of output power and volume as a result of applying series-series resonant compensation

Design of an Axial-Flux permanent magnet machine for an in-wheel direct drive application

This paper concerns the optimization and comparison of six different axial-flux permanent magnet (AFPM) machine topologies for an in-wheel direct drive application. The objective of the optimization is to reach maximum power density, which is of essence for an in-wheel motor. The machine topologies are optimized using the 3D analytical charge model in combination with a thermal equivalent circuit model for calculation of the temperature rise and thermal dependency of the main electromagnetic losses. All investigated AFPM machine topologies are variations of the internal stator twin external rotor AFPM machine. The resulting designs are compared based on their power density, weight, efficiency, and permanent magnet volume. The distributed winding topology with a quasi-Halbach magnet arrangement shows the best performance within the optimization problem