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The coupling of the windings can be easily increased by using multiply stacked planar windings connection. Interleaving is a well-known technique used to reduce leakage inductance and minimize high-frequency winding losses. The paper aims to analyze leakage inductance based on magneto motive force (MMF) and energy distribution in planar transformer and correct the formula of leakage inductance proposed...
This paper presents a 2-D nonlinear time-harmonic finite element model of induction motor for use in the accurate dynamic simulation. In the proposed model, it is not necessary to rotate the rotor, the resistivity of the rotor material is modified in terms of the specified load condition. The nonlinear properties are represented by using the effective magnetization curve. The field-coupled circuit...
The design process of a switched reluctance drive for household applications is described. The machine requirements for modern household applications are summarized and the design process of a 150 W three-phase switched reluctance drive is described. During the process special attention was paid to the stator's mechanical resonance frequencies to assess influences of the acoustic noise. Also drive...
An observer-based thermal modelling technique suitable for computation on embedded microprocessors to provide system wide prediction and projection of thermal state of function for a minimum increase in part count is proposed. High accuracy 3D finite element simulation is employed to calibrate a low complexity lumped parameter model from which a Luenberger observer is derived. Only a single temperature...
In the power system, the controllable reactor can be used as reactive power compensation device to limit over-voltage operation, reduce no-load or light load loss and improve transmission capacity. It is with characters of simple structure, easy maintaining, low cost and high stability, etc. The magnetic field is closely related to the reactor performance. In this paper, aiming at a controllable saturated...
The objective of the paper is optimization of the outer rotor permanent-magnet transverse-flux motor using design of experiments. First, the 3-D time-stepping finite-element analysis is used to evaluate the relationship between the measured and calculated results. Further, in the 3-D time-stepping finite-element analysis a parametric model of the transverse-flux motor is coupled with an external three-phase...
Transverse flux machine (TFM) useful for in-wheel motor applications is presented. This transverse flux permanent magnet motor is designed to achieve high torque-to-weight ratio and is suitable for direct-drive wheel applications. As in conventional TFM, the phases are located under each other, which will increase the axial length of the machine. The idea of this design is to reduce the axial length...
Performance investigations and drive designs of an interior permanent magnet (PM) machine, in both the constant torque and the flux-weakening operating regions, are generally conducted based on the machine parameters that are calculated from finite element analysis (FEA). To properly select the optimal current control angles for maximum torque generations at various speeds, this paper presents thorough...
This paper investigates the existing structures of transverse flux machines (TFMs) that can be constructed as an outer rotor in-wheel motor which is suitable for low speed applications. As the main characteristic of TFM is providing the best torque density at low speeds, it would be a suitable choice and having a great future for low speed mobile platforms. Different structures of TFM are re-designed...
This paper presents a 3-phase, 400 W, 14000 rpm, 2-pole/3-slot non-overlapping windings PM motor. In the design of the motor, Taguchi parameter method coupled with the finite element method (FEM) analysis is employed to minimize the level of cogging torque and maximize the efficiency of the motor. A mechanical analysis is carried out to investigate the mechanical feasibility of the rotor due to high-speed...
Transverse flux permanent magnet machine (TFPMM) offers a higher power density than the conventional radial and axial ones. Based on the principle of TFPMM, a novel flux switching transverse flux PM generator (FS-TFPMG) with a unique structure is presented for low speed wind power applications in this paper. The stator space utilization can be improved by arranging more stator cores and the flux density...
This paper is aimed to present the systematic design scheme of a direct driven slotless tubular linear generator for renewable energy retraction. To reduce operational cogging and increase energy conversion efficiency, the generator stator is equipped with slotless concentrated annular multiphase windings and its mover is encircled by quasi-Halbach arranged permanent magnets. By systematic comparisons...
This paper focuses on the restraint method of the 3rd harmonics current, in which close attention has been paid to the iron core shape of the universal motor for power vacuum cleaners. In this paper, the gap permeance, magnetic saturation of an iron core, and the influence that a slot ripple has on harmonic current were verified using FEM electromagnetism analysis. As the result, stator core shape...
This paper presents a magneto-thermal model for high-speed SMC motor. Due to high frequency, core loss is much greater than other losses and it is of crucial importance to be able to calculate the core loss accurately. By using time-stepping FEA, the total core loss is computed by summing up the separately calculated alternating and rotational hysteresis, eddy current and anomalous losses in each...
This paper presents a new scalar-controlled double-stator permanent magnet brushless (DS-PMBL) motor. Because of the special phase decoupling structure, scalar control strategy is newly incorporated into the time-stepping finite element method (TS-FEM) to analyze the transient performance of machine. The complicated coordinate transformation is avoided and constant torque and flux weakening control...
High performance applications like power steering and robotics require motor drives that produce smooth torque with very low components of cogging torque. To fulfil such demands a variety of techniques are known to reduce native cogging torque components in permanent-magnet motors. However, motor designers usually do not consider that assembly tolerances in mass-production give rise to additional...
This paper proposes an analytical approach that is generalized for the design of various types of electric machines based on a physical magnetic circuit model. Conventional approaches have been used to predict the behavior of electric machines but have limitations in accurate flux saturation analysis and hence machine dimensioning at the initial design stage. In particular, magnetic saturation is...
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