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For thin steel plates, which are used in many industrial products including those of the automobile industry, we have proposed a magnetic levitation control system and confirmed its realization by means of a digital control experiment. However, the use of a limited number of electromagnets cannot suppress static deflection and high-order-mode elastic vibration, which are characteristics of a flexible...
The analysis of discontinuous conduction mode (DCM) for a novel single active switch based zero voltage and zero current switching (ZVZCS) tapped boost converter is proposed in this paper. The ZVZCS converter includes a lossless snubber composed of three diodes and two capacitors, and exhibits novel ZVZCS operation for wide operating ranges of duty cycle, load current, and input voltage. The voltage...
For power transfer to the rotor circuit of excitation-type synchronous motors, we propose a contactless power transfer system with a primary series capacitor (S topology) to compensate for the leakage reactance. This system does not contain secondary resonant and smoothing capacitors and can reduce the number of components in the rotor circuit. The value of the primary resonant capacitor is determined...
An integrated single-phase single-stage high-frequency (HF) isolated dual-tank LCL-type series resonant ac-dc converter with fixed frequency, phase-shift control strategy is presented. The circuit configuration combines a diode rectifier, boost converter and two identical half-bridge dc-dc LCL resonant converters. A high power factor (PF) and low total harmonic distortion (THD) is achieved by discontinuous...
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...
In this paper, it was proposed to the optimization of skew of SPMSM with 3-dimensional finite element method (3D-FEM). The optimization technique was used multi-step parallel Genetic Algorithm (GA) and the allocation of material assignment method. As a result, in useful computation time, It was able to obtain an optimal skew special shape. And, it was able to reduce the cogging torque of more than...
Thin steel plates are widely used in various industrial products. But there are problems where deterioration of surface quality and metal plating occurred by transporting. As a solution to these problems, a noncontact transport of steel plates using electromagnetic force has been proposed. However, there is a risk that side slipping or the dropping of the plate may occur owing to inertial force because...
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 a design and optimization of a high current planar transformer for very high efficiency dc-dc isolated boost converters. The analysis considers different winding arrangements, including very high copper thickness windings. The analysis is focused on the winding ac-resistance and transformer leakage inductance. Design and optimization procedures are validated based on an experimental...
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