Line-Start Synchronous Reluctance Motor (LS-SynRM) has been received the attention as high efficiency motor. However, LS-SynRM must be performed using electromagnetic and mechanical transient analysis of finite-element analysis (FEA). This analysis method has a disadvantage of requiring a lot of analysis time. Therefore, in this paper, the fast performance analysis method is proposed based on an equivalent circuit and FEA. The operating points of LS-SynRM are determined by the dq-axis inductances which have the nonlinear characteristics. Considering the nonlinear characteristic of dq-axis inductance, the parameter is computed using magnetostatic FEA. Based on the motor parameters and equivalent circuit, the current vector is computed, and the iteration is performed until the current vector converges. By comparing the performances using the proposed analysis method and electromagnetic and mechanical transient analysis of FEA according to the load conditions, the effectiveness of the proposed analysis method is verified. Furthermore, the manufactured 2.2kW LS-SynRM is testing, and the proposed analysis method is verified by comparing experiment results.

The existing papers on Line Start Synchronous Reluctance Motor (LS-SynRM) were mainly about design methods to achieve high efficiency without considering rotor bar loss, but in reality, rotor bar loss is caused by harmonics. Therefore, this paper analyzed the effect of rotor bar copper loss caused by harmonics on LS-SynRM.

This paper is a study on the torque characteristics of a permanent magnet-assisted synchronous reluctance motor (PMa-SynRM) according to the arrangement of permanent magnets(PMs). In order to identify the movement of the magnetic neutral point due to the arrangement of PMs, a model with PMs inserted in the direction of rotation and a model with PMs inserted in the opposite direction of rotation were selected and compared by FEA. In addition, the causes of the movement of the maximum point of magnetic torque and the maximum point of reluctance torque and their influence on torque characteristics were examined. Finally, an excellent model is selected by comparing torque characteristics according to speed.

This paper deals with the design using the magnetic equivalent circuit (MEC) of an external rotor brushless DC motor (BLDC) for drones applied with a halbach magnet array. Since magnetic circuits are similar to electrical circuits, design elements can be parameterized by applying Kirchhoff's law, and saving time and simplifying preliminary design compared to finite element analysis (FEA). When the Halbach magnet array is applied to the motor, the characteristics of the motor can be improved according to the permanent magnet thickness and pole ratio. If the halbach magnet array is applied to the motor, the main magnetic flux can be improved, but most of the designs are intuitively designed by analyzing tendency through FEA. In this paper, to systematically analyze the halbach magnet array design, which relied on experience, a MEC was constructed through inductance analysis. A MEC was established in consideration of the number of segments and the magnetization angle of the halbach magnet array, and based on this, an optimization of motor design was conducted to prove the validity of the design and analysis.

A resolver is a type of converter, that provides the rotation angle of a rotating device by converting it into an electric signal. The analog resolver requires converting the resolver signal into a digital signal. The angle tracking observer (ATO) method is the most widely used software resolver-to-digital conversion methods. In an actual resolver-based position detection system, amplitude imbalance and quadrature imperfections are the main causes of distortion in the estimated position information of the ATO. Some papers have published research results on compensation for the position error of the output signal of the resolver with amplitude imbalance. However, this paper presents a new ATO algorithm that can compensate for the position error caused by the imperfect quadrature in addition to amplitude imbalance. This method eliminates the need to pre-measure offline data because the method is easy, simple, and cost-effective and can achieve online error compensation. Simulations and experiments were performed to verify the validity of the proposed algorithm. The proposed ATO was able to reduce the position error by 2° compared to the conventional ATO.

Regulatory protocols such as the Convention on Climate Change and the regulation of greenhouse gas emissions act as catalysts for the development of high-efficiency energy equipment and the efficient use of energy. Among the fields where energy consumption is high, the electric heating equipment is not efficient. The electric boiler mainly uses a method of circulating water by contacting the heater. When the existing electric boiler is used, the water minerals are contacted with the high-temperature heater to be carbonized and adsorbed, thereby promoting the corrosion of the heater and lowering the efficiency of the heater. For this reason, an electric induction boiler, which has high energy efficiency and is applied to an induction heating system that can uniformly heat the object to be heated rather than conduction or convection heating, is in the limelight. This method induces a boiler pipe And it is recognized as an alternative that can solve the problem that occurs when heating is performed by direct heating. Despite the fact that research on induction heating has been conducted for a relatively long period of time, there have been few studies on the electrothermal technology using induction heating. Therefore, in this paper, to improve the heat efficiency of electric induction boiler, the influence of the cross sectional area, number of windings and winding layers is analyzed by finite element method through parametric study method. The method of finding the design point which maximizes the total loss is proposed by the alternating winding design method which can maximize the heat generation by analyzing copper and iron losses.

The sensorless control of high efficiency air compressors using a permanent magnet type synchronous motor as an oil-free air compressor is quite common. However, due to the nature of the air compressor, it is difficult to install a position sensor. In order to control the permanent magnet type synchronous motor at variable speed, the inclusion of a position sensor to grasp the position of the rotor is essential. Therefore, in order to achieve sensorless control, it is essential to use a permanent magnet type synchronous motor in the compressor. The position estimation method based on the back electromotive force, which is widely used as the sensorless control method, has a limitation in that position errors occur due either to the phase delay caused by the use of a stationary coordinate system or to the estimated back electromotive force in the transient state caused by the use of a synchronous coordinate system. Therefore, in this paper, we propose a method of estimating the position and velocity using a rotation angle tracking observer and reducing the speed ripple through a disturbance observer. An experimental apparatus was constructed using Freescale's MPU and the feasibility of the proposed algorithm was examined. It was confirmed that even if a position error occurs at a certain point in time, the position correction value converges to the actual vector position when the position error value is found.

The international technical trends research institution and association for unmanned vehicle systems international announced that the demand of drone had been risen sharply, in addition the development possibility of that would be considerably positive. One of the most important devices in drone is camera gimbal to take high quality images. Generally motor are used to realize 2 degree of free domin this system the writer suggested that TM(Torque Motor)designed in this paper will be able to make the system simple. In addition the control system will be brief. Optimized torque motor was made in this paper, based on the SPMSM(Surface Permanent Magnet Motor)designed in the project aimed at making gimbal motor. TM was designed with FEM(Finite Element Method). By making comparison the control system between SPMSM and TM, the advantage of TM and validity of using it in gimbal were investigated. Base model was made, based on physical phenomena. Furthermore FEM, RSM(Response Surface Methodology) was used to optimize it. With the result, the performance evaluation was conducted between SPMSM and TM. Finally the research direction of TM was suggested on the basis of data in this paper.

This paper deals with an analysis of the design parameters and its influence on performance of the linear induction motor (LIM). LIM model for maglev conveying system designed considering equivalent circuit and design limitation. To effectively investigate the effects of design variables on performances such as thrust force, thrust ripple, efficiency and power factor, response surface method (RSM) is applied. By using central composite design, design points that can efficiently estimate the effects of the design variables considering nonlinearity are obtained. The optimal model that has improved performance was derived by RSM and the model was verified by the finite elements method (FEM).

본 논문은 로프리스 엘리베이터의 상용화에 앞서 로프리스 엘리베이터의 기반 및 요구기술과 개발 시의 문제점 및 개선방향을 제시하기 위한 선행연구를 제안한다. 본 연구에서는 연구의 구현을 위하여 로프리스 엘리베이터를 소형시스템으로 제작하고 또한 자체 리니어 속도센서를 제작, 본 시스템에 적용하여 속도제어 시험을 통하여 문제점을 검토하고자 한다. 속도제어는 곡선구간을 포함한 전 영역에 걸쳐 수행하였으며, 본 연구의 수행 결과 로프리스 엘리베이터의 실현 가능성을 확인하였으며 구동제어 기술의 만족할 만한 결과를 얻었다. 하지만 현재의 기술적인 수준에서는 상용화를 위해 센서, 고성능 제어기, 정밀 구조물, 안전장치, 효율향상 등 향후에도 더욱 개선되어야 할 여러 가지 문제점도 도출할 수 있었다. 【This paper suggests a preceding study to introduce implementing problems and improving direction when commercializing a ropeless elevator. In this study, the implementation of the study of pilot systems in order to produce the ropeless elevator and also build a linear velocity sensor, this system is applied to the speed control experiment was investigated through testing. Speed control test is carried out in all track including a curved section. This study verified the feasibility of the ropeless elevator and its drive controller is good enough to be accepted. This study also extracted many more problems that still need to be improved in the future for commercializing such as the sensor, high-performance controller, precision structures, safety devices, efficiency improvements and so on.】

Resolvers are transducers that are used to sense the angular position of rotational machines. The analog resolver is necessary to use resolver to digital converter. Among the RDC software method, angle tracking observer (ATO) is the most popular method. In an actual resolver-based position sensing system, amplitude imbalance dominantly distorts the estimate position information of ATO. Minority papers have reported position error compensation of resolver's output signal with amplitude imbalance. This paper proposes new ATO algorithm in order to compensate position errors caused by the amplitude imbalance. There is no need premeasured off line data. This is easy, simple, cost-effective, and able to work on line compensation. To verify feasibility of the proposed algorithm, simulation and experiments are carried out.

Interior permanent magnet synchronous motor is widening its application compared to other AC machines because of magnetic and reluctance torque. Despite of the advantages, improving control performance with parameter nonlinearity consideration is crucial during the field weakening control. This paper shows a maximum power control method at the field weakening region that considers d, q inductance's nonlinearity due to magnetic saturation and d, g mutual inductance. To verify the feasibility of control scheme, FEM simulations and experiments about comparison between linear and nonlinear maximum power control are carried out.

Recently, SynRM has been focused by many researchers and there has been a lot of works for the industrial application of SynRM. In spite of several merits of SynRM, the information of exact rotor position is also required to perform the precise torque control, which causes the increment of cost and demerits SynRM to use in industrial application. Therefore, we studied sensorless control algorithm for the torque control of SynRM to overcome the demerits. Specially we proposed simple algorithm to estimate rotor position using trigonometric function, verified with computer simulation and experiment.

In this paper, a genetic based self-tuning speed controller is proposed for the high-performance drives of induction motors. For a high-performance drives, nonlinear system identification of a motor drive system is required and the results of system identification could provide the controller with information regarding the load variation and parameter variation of the motor. The proposed controller can change the gains of the controller according to system conditions. The gain is composed with system parameter of drive system. For the estimation of system parameters, a genetic algorithm is used. A self-tuning controller is designed that is adequate for the speed control of the induction motor. The availability of the proposed controller is verified through MATLAB/Simulink simulations and is compared with the conventional PI controller.

Generally, cogging torque derives from motor using permanent magnet such as interior permanent magnet synchronous motor (IPMSM) and surface permanent magent synchronous motor (SPMSM). The cogging torque works for smoothness in rotation of the rotor, but it is a kind of root cause mechanical vibration and acoustic noise. Consequently, cogging torque must be reduced by all manner of means. There are various methods to reduce the cogging torque, but this paper deals with two ways in the IPMSM. One is tapping the rotor and the other is design of barrier shape. Besides, this paper proposes best design of the IPMSM to reduce cogging torque, and the analysis of cogging torque by using FEM is compared with experimental results to verify.

본 논문에서는 자기부상 시스템에서 널리 채용되고 있는 흡인식 자기부상 시스템의 제어특성을 개선하기 위한 연구를 수행하였다. 흡인식 자기부상 시스템은 그 특성 상 제어계의 불안정성을 내재하고 있기 때문에 일반적으로 산업현장에서 널리 사용되는 비례적분제어방식(PI)이 아닌 비례적분미분제어방식(PID)을 이용하여 제어 시스템을 구성한다. 본 논문에서는 이러한 PID 제어방식의 제어특성을 개선하기 위하여 외란관측자를 이용한 제어기를 제안하였으며 컴퓨터 시뮬레이션과 실험을 통하여 그 특성을 확인하였다.

This paper presents a sensorless algorithm of the synchronous reluctance motor(SynRM). Conventionally flux estimation method using phase voltage integration has problem in low speed operation. This is due to insufficient terminal voltage in that speed. However in high speed operation, it is enough to estimate rotor flux. Therefore in this paper the current model which uses phase current signal is proposed to compensate the insufficiency of terminal voltage in low speed to estimate rotor position. Computer simulations are performed to confirm the adequacy of the proposed control scheme. The experiments are also performed for verification of proposed algorithm.

The new flux reversal machine (FRM) has a simple robust rotor with a permanent magnet installed stator. However, the parameters of the FRM are dependant on the position of the rotor, operating temperature and magnetic saturation of the motor core. To obtain a robust performance in the speed control of the single-phase FRM, a control method that introduces an internal model of the motor is suggested for robustness against parameter variance and disturbance. The suggested control method is verified by both computer simulation and experiments and it is applied for popular AC induction/synchronous machines for their robust performance.