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Claw-pole motor has naturally 3D structure, because of the structural complexity. However, it was simplified as a 2D model by linear approximation. The rotor model of PM-assisted claw-pole motor has permanent magnets, as well as a field winding. Then an electric equivalent circuit is developed with a current source and a voltage source. Further, the rotor core saturation problem is treated with a...
This paper proposes a novel coupler structure for wireless power transfer, which takes advantage of both magnetic and electric fields. The coupler contains four metal structures, two each at the primary and secondary sides, which are capacitively coupled. Each structure consists of long strips of metal sheet to increase its self-inductance, which is then inductively coupled with the other three structures...
The coupling coefficient of a transformer is a key parameter affecting the performance of a wireless power transmission system. Based on the magnetic reluctance model under aligned condition, this paper gives an effective method for calculating the null coupling position, as well as a practical and accurate model for finding the coupling coefficient under coil misalignment and varying air gap. The...
Inductive Power Transfer (IPT) systems have been proposed for various applications and have been increasingly gaining interest for electric vehicle (EV) charging. Numerous magnetic structures have been proposed for IPT systems for EV charging including structures involving mutually decoupled coils. This paper presents an analytical model of an IPT system composed of a two coil primary pad and a single...
This paper presents an analytical model, for a new spoke type variable flux machine, with AlNiCo magnets, in the no-load condition. This method is based on the solution of a simple magnetic equivalent circuit of spoke type machines. The effect of stator slots on the air gap magnetic flux density is studied and uneven air gap length is modeled. Based on the no-load air gap magnetic flux density, the...
This paper presents a new method of combined electromagnetic levitation and propulsion using a double sided pair of linear induction machines and a simple conductive sheet secondary. If the supply phase angle of one primary is modified with respect to that of the other, a controllable lift force can be developed on the conductive secondary and its load at any velocity or when stationary. Further,...
This paper proposes a novel approach for calculating position-dependent inductance matrix of slotted permanent magnet synchronous motors (PMSMs) and advanced analytical models for machine voltage and torque. In a real PM machine, the slotted structure of the stator and rotor causes unintended variations in air-gap permeance and magneto-motive force (MMF). The proposed approach analyzes the effects...
A novel partitioned primary linear switched flux permanent-magnet machine (LSFPMM) is presented. Its primary is divided into two separate parts: one is the armature containing iron core and windings, and the other is magnetic poles containing PMs and iron core. For the optimal design objective of maximum thrust force and minimum thrust ripple, the novel partitioned primary LSFPMM with 9 primary/10...
Due to the high torque density and sharing similar operating principles with vernier machines, the magnetic-geared permanent magnet machines have been gaining more attention recently. This paper focuses on power transferring feature of a magnetic geared machine among the stator, modulation layer and rotor by analytical methods. Analytical equations of the back electromotive force, torque and power...
The latest developments in carbon nanotube (CNT) wires and yarns attract great interest for potential application to electromagnetic devices, such as electrical machines and transformers. The CNT material properties are largely different from copper and aluminum in terms of electrical conductivity, mass density, and thermal transfer, creating a new design paradigm for which the traditional rules and...
This paper examines torque ripple in a new topology of variable flux machine with AlNiCo magnet. To reduce the torque ripple, the design and finite element modeling of this machine are reviewed and the finite element model results are verified with the prototyped motor. The effects of various electrical, magnetic and geometrical parameters such as load, magnetization level of the magnet, tooth and...
An improved field reconstruction method (IFRM) to model interior permanent magnet synchronous machine (IPMSM) is proposed to reduce computation time. In modeling IPMSM with conventional FRM, in order to include slotting effect, the basis function at various rotor positions has to be obtained and stored which increases the workload. The saturation and slotting effect can be avoided by employing conformal...
This paper proposes an analytical machine design tool using magnetic equivalent circuit (MEC)-based particle swarm optimization (PSO) for a double-sided, flux-concentrating transverse flux machine (TFM). The magnetic equivalent circuit method is applied to analytically establish the relationship between the design objective and the input variables of prospective TFM designs. This is computationally...
Due to the nature of doubly salient structure and high air-gap flux density, flux-switching permanent magnet (FSPM) machines typically suffer from large cogging torque, causing undesired acoustic noise and vibration, especially at low speeds. In this paper, various tooth chamfering methods for a 12/10 FSPM machine are proposed to reduce cogging torque. The influences of both circular bead and right...
The secondary coil installed on an EV is required to be small in size, light in weight, and efficient in power transfer, as well as tolerant in lateral misalignment with a large air gap. Also, a wireless power transfer (WPT) system needs high power transfer. Both downsizing and high power transfer bring a thermal problem the secondary coil. This paper proposes a WPT system combining the so-called...
This paper proposes an alternative spoke type interior permanent magnet machine (STIPMM) design to minimize the pulsating torque and decrease the use of permanent magnet materials. The proposed rotor design consists of a number of rotor lamination stacks with notches made on the surface and packed in the axial direction. Within each stack, the width of the permanent magnets (PMs) and the span of the...
In high-speed permanent-magnet synchronous machines (PMSMs), the permanent magnets (PMs) are usually retained by high strength sleeves. Metallic sleeves are preferred in some cases where a high rotor stiffness is required. However, high frequency time and spatial harmonics of the air-gap field would induce considerable eddy-current losses in the conductive sleeve, and thus exposing the PMs to risk...
Stator DC winding Excited Vernier Reluctance Machines (DC-VRMs) are a kind of novel machines, which are investigated more and more owing to absence of expensive permanent magnet material. However, DC-VRMs are found to have large torque ripple if they are not carefully designed. There are a lot of existing methods to reduce the cogging torque in permanent magnet (PM) machines, but the design techniques...
This paper proposes a novel stator-consequent-pole memory machine (SCPMM), in which the AlNiCo permanent magnets (PMs) with low-coercive-force (LCF) are alternately placed between the adjacent stator teeth. This new machine has the merits of simplified online PM magnetization, robust rotor and easy thermal management. Meanwhile, the energy-efficient flux regulation can be achieved since the LCF magnets...
This paper presents the design considerations of a double-sided transverse flux machine (TFM) for direct-drive wind turbine applications. The TFM has a modular structure with quasi-U stator cores and ring windings. The rotor is constructed with ferrite magnets in a flux-concentrating arrangement to achieve high air gap flux density. The design considerations for this TFM with respect to initial sizing,...
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