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In recent years, an energy issue is becoming serious or severe. Therefore, power electronics technology is one of the key technologies since this technology can deal with electric energy efficiently, and some company tries to introduce this technology. Our company offers the opportunity to study this technology such as a circuit topology, designs of inductor or transformer with practical experiments...
In this work a compact-model-based inductor design procedure is presented. The losses, temperatures, and the total cost of ownership (TCO) of an inductor are expressed analytically. All geometric dependencies are summarized in a set of parameters which are calculated using finite element analysis (FEA). Therefore the model does not depend on the actual inductor geometry, instead it only relies on...
A novel single-drive bearingless motor with high passive stiffness and wide gap factor has been proposed. The single-drive bearingless motor has only one set of three-phase windings. It generates both torque and axial suspension force independently with only one three-phase inverter and one displacement sensor. Therefore, the single-drive bearingless motors have the advantages of low cost and small...
This paper describes a novel one-axis actively regulated bearingless motor with a spinning top-shaped rotor, which is intended for a use as a cooling fan. This motor requires only one set of three-phase winding and thus one three-phase inverter to realize both rotation and magnetic suspension, and thus it is dubbed a single-drive bearingless motor. An axial position of the rotor is actively regulated...
Permanent magnet synchronous motors (PMSMs) with rare-earth permanent magnets (PMs) are most popular for automotive applications in which high torque density and high efficiency are required. Because the rare-earth materials have risks of lacking stable supply, rare-earth-free motors such as claw pole motors are widely studied. This paper presents the driving characteristics of a claw pole motor with...
This paper presents an air gap control method of a multi-phase transverse flux permanent magnet linear synchronous motor (MP-TFPMLSM) based on independent vector control. Especially, the MP-TFPMLSM is composed of symmetrical multi-phase and multiple-module structures, which are basically three-phase configurations. Hence, in this paper, a d-axis current control applying the d-q transformation and...
We have proposed a novel transformer model using magnetic circuit. Numerical simulations using PSCAD/EMTDC has been performed, and the performance have been examined.
An interior permanent magnet synchronous motor experiences large harmonic iron loss in the stator teeth caused by the harmonic magnetomotive forces. In particular, the eddy current loss remarkably increases at high rotational speeds under the flux weakening control. In this paper, a novel suppression control method for the stator iron loss is proposed by utilizing the individual winding current control...
Plasma-assisted ignition technology has been proposed to boost the combustion efficiency of scramjets during high speed flight. One technique utilizes high-voltage nanosecond-duration pulses, which can generate free radicals thereby initiating ignition earlier in the combustion chamber and improving fuel efficiency. A high-voltage nanosecond pulse generator is an integral part of the system.
A study evaluating the iron loss of a developed iron powder core under DC bias conditions with sinusoidal and square magnetizing voltage waveforms was conducted. It was found that the iron loss of the powder core decreases when the DC bias magnetic flux density increases. Also, the variation in the iron loss of the core material caused by the difference in the magnetizing voltage waveform is smaller...
Recently, a permanent magnet type synchronous motor (PMSM) has been widely used. The PMSM cannot start without an inverter. The authors have proposed in a previous paper a novel self-start type PMSM which moves as induction motor at asynchronous speed region and moves as synchronous motor at synchronous speed. It was surface type PMSM and had relatively large area squirrel-cage region. This paper...
A high-efficiency motor is required in order to address recent environmental issues. Permanent magnet synchronous motors (PMSMs) are widely used because of their high efficiency. However, even higher efficiency is required in order to reduce the power consumption of motors. The structures of PMSMs using a powder magnetic core are considered. Since the powder magnetic core has very little eddy current...
In this presentation the development of an induction motor of which stator core is made of molded SMC (Soft Magnetic Composite) will be presented. The molded core shows low iron loss compared to the iron loss of machined core. Iron loss of machined core is large because of the heat at the machining of bulk SMC. Moreover, by using SMC, 3D shaped core is easily constructed. The teeth of the stator core...
In general, the in-wheel type permanent magnet synchronous motor (PMSM) for electric city commuters uses powerful rare earth permanent magnets (PMs). However, the employment of the rare earth PMs should be reduced due to high prices. Therefore, it is important to develop an in-wheel PMSM that does not use the rare earth PMs. We proposed 5kW in-wheel type axial gap motor that can generate high torque...
This paper describes a surface permanent magnet (SPM)-type vernier motor that can generate high torque at low speeds, and a simple, high-speed method for analyzing its output characteristics is proposed. In this method, if the induced electromotive force, the synchronous reactance, and the iron loss are provided by finite element analysis (FEA), the output characteristics can be calculated immediately...
This paper proposes a simple magnetic equivalent circuit using permeance method in order to design rough configurations of the lowest loss motor. First, the iron loss is calculated by the proposed method and compared with the analysis result by finite element method (FEM). As a result, the error of the calculation results between the proposed method and the FEM is 2.9%. Next, the motor losses are...
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