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A spoke type permanent magnet synchronous motor (Spoke PMSM) generates axial leakage magnetic flux due to its flux-concentrating rotor structure and therefore degrades motor performance. Although a three dimensional finite element method (3D-FEM) can be used to estimate the axial leakage magnetic flux, it requires a lot of analyzing time. In this study, a calibration coefficient is proposed to estimate...
The accurate estimation of the performance change according to varies in stack length of motors is important in related industries. A permanent magnet (PM) motor usually represents a characteristic in which its back-emf constant is linearly proportional to stack length. It is an enormous advantage in designing and estimating the performance of PM motors. However, the linearity cannot be held in spoke...
Parametric array transducers are used for long-range and highly directional communication in underwater environment. The power amplifiers for parametric array transducers should have sufficient linear output characteristic and high efficiency to avoid communication errors, system heating, and fuel problems. But the conventional power amplifier with fixed source voltage is very low efficient due to...
Reports indicate that the prevalence of gastrointestinal involvement of Behçet’s disease (BD) shows geographic variation. Since no true population surveys are available, at least some of this variation could be due to selection bias. The usually reported prevalence is less than 1% among patients from the Western countries and the Middle East while this frequency becomes 10% or higher in the Far East...
In this paper, a nonlinear adaptive control of a 3D overhead crane is investigated. A dynamic model of the overhead crane is developed, where the crane system is assumed as a lumped mass model. Under the mutual effects of the sway motions of the payload and the hoisting motion, the nonlinear behavior of the crane system is considered. A nonlinear control model-based scheme is designed to achieve the...
In this paper, a method to implement the input shaping control in Mechatrolink-III motion system is introduced. Firstly, the underdamped system is theoretically built by modeling. Then, the motion controller of Mechatrolink-III network is designed to apply the input shaper for reducing residual vibration in manufacturing machine. Later, the experimental beam is set-up to verify the effective performance...
While there are many studies on student persistence in undergraduate programs offered in traditional classroom settings, there is a lack of empirical research investigating the factors affecting the completion of online advanced degree programs. In order to address such research need, this study collects student data from an online GIS Master's program and employs logistic regression to assess a set...
The paper proposes a new multilevel variable output voltage AC/DC Converter for power supply of power amplifiers used in underwater acoustic sensors. The proposed multilevel variable output voltage AC/DC Converter is composed of two converter sections. One as the input section is a high efficiency phase-shifted PWM full bridge DC-DC converter to get multiport power sources. The other as the output...
Permanent magnet synchronous motor (PMSM) has been used to drive a number of vehicles. PMSM has high torque density, high efficiency and wide speed range. However, the high cost of permanent magnets is viewed as a disadvantage. This paper presents a technique that can increase the torque density by modifying the shape of permanent magnets and minimizing the magnet volume. Models were compared by increasing...
The interior permanent-magnet synchronous motor (IPMSM) is often used as the traction motor of hybrid electric vehicles (HEVs) and electric vehicles (EVs) due to its high power density and wide speed range. This paper introduces the 120kW class IPMSM for the traction motor of military truck. This system as SHEV (series hybrid electric vehicle) needs a traction motor which generates high torque. To...
This paper proposes an optimal rotor design method of an interior permanent magnet synchronous motor (IPMSM) using a permanent magnet (PM) shape. The goal of this design is to obtain the minimum design variables of an objective function using a Box-Behnken response. To find the best design model, high torque and low torque ripple were found from electromagnetic finite element method, and safety factor...
In this paper, we propose an iterative subchannel selection scheme for distributed signal to inteference and noise ratio (SINR) maximization in multiple-input multiple-output (MIMO) interference channels. At each iteration of the proposed scheme, each user chooses the predetermined number of subchannels to maximize its own information rate in a distributed way. Numerical results are presented to verify...
This paper presents a fire alarm vision system based on flame detection algorithm of infrared image. The presented flame detection algorithm measures the luminance variation of candidate flame blocks of the IR image and it determines existence of the fire according to the amount of variation of luminance. By using the test images, the simulation of flame detection algorithm was performed and implemented...
This paper presents the optimal design method of cage-bars in a single-phase line-start permanent magnet synchronous motor. This method consists of two procedures. First, the basic design of cage-bars is made by analytic method of an induction motor. But, this method cannot consider nonlinear characteristic as magnetic saturation and leakage flux. Therefore, at second step, for considering the nonlinear...
In this paper, both analytical method and numerical method are used to suggest the rotor design process of the single-phase LSPM motor. The cage-bar is designed to generate the maximum starting torque by analytical method. The torque generated from the synchronous speed is divided into reluctance torque and magnetic torque to design barriers and permanent-magnets. In this process, optimal design method...
IPMSM has been often developed for HEV because it has a high power density and a wide range of operations. However, an armature reaction occurs from the high current and also the hysteresis loss from electrical steel of rotor and stator and the magnet is pretty high due to the high speed driving. Moreover, for IPMSM, there are hardly any accurate specifications or studies to verify the loss through...
IPMSM with more than 10KW, which is used for HEV, has lower Ld-Lq since a groove was made on the Q-axis flux path of the rotor to reduce the eddy current loss in the permanent magnets. Therefore, a high reluctance torque and wide operating range can't be expected. Also in the winding layout, concentrated winding may widen the operating range; however this is needed the fractional slot or leads to...
Considering the development and the prototype presentations of electrical and hybrid electrical vehicles over the last decade, one can see that several machine types were applied the direct current machine (DC), induction machine (IM), the permanent magnet synchronous machine (PMSM), and the switched reluctance machine (SRM). However many comparison study shows the IM or PMSM is suitable for hybrid...
When we design an IPMSM, we start with the output and the voltage equations of the machines. The output equation has two terms which are magnetic torque and reluctance torque. The magnetic torque is related to the electric-and magnetic-loading but reluctance torque is related to one more variable which is the difference of the d-and q-axis inductance. Therefore it is very important to calculate or...
This paper compares the characteristics of Interior Permanent Magnet Synchronous Motor (IPMSM) equipped with concentrated, distributed winding for traction application. For comparison, 8-pole 12-slot model and 8-pole 36-slot model are designed in constrained size. Since the traction motor operates at wide speed region, torque and loss characteristics are analyzed for two points at base and maximum...
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