• 조명전기설비학회논문지
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• 제28권10호
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• pp.37-42
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• 2014

This paper discusses study of sensorless control of a variable speed switched reluctance motor (SRM) for electric AC compressors on electrical vehicles. A typical SRM drive requires a position sensor such as an encoder or hall sensor to measure the angular rotor position. However, harsh environment in electrical AC compressors for electric vehicles makes it difficult to use the position sensor in their motor drive system. Therefore, a sensorless control scheme for electric compressor motors utilizing magnetic characteristics of SRM with respect to position angle and phase current is proposed. The overall variable speed SRM drive with position sensorless control scheme has been modeled using Matlab/Simulink software and closed loop current control simulation is presented to validate the proposed sensorless drive control.

• 조명전기설비학회논문지
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• 제24권4호
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• pp.185-191
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• 2010

본 논문에서는 인덕턱스의 변화에 따른 전류 변화율을 모니터링 하여 회전자의 속도 및 위치를 추정하는 센서리스 구동방법을 제안한다. 전류의 변화율은 히스테리시스 전류제어 방법을 이용하여 인접한 두 스위치 온 타임을 비교함으로써 간단히 측정할 수 있다. 제안된 방법은 복잡한 계산이나 별도의 하드웨어를 필요치 않으므로 구현이 용이하다. 시뮬레이션과 실험 결과는 제안한 방법의 실효성을 보여준다.

• 전자공학회논문지B
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• 제33B권2호
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• pp.217-226
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• 1996

Switched reluctance motor (SRM) drives appear today as viable alternatives to induction and brushless motor drives in a wide range of application such as machine tools, fans, and pumps. This paper deals with a new converter topology which can be used in order converter. The split source type converter consists of minimum switching devices to be used in switched reluctance motor (SRM) drive. In this proposed converter two switches and six diodes are added to split source type converter. The proposed converter has performance minimizes the negative torque, Which puts the phase current off by double impressed voltages. The major advangtage of this converter is the increase of the average output power while improving better converter efficiency in heavy load and high speed than other topologies. The proposed converter system has been implemented using 80C196KB microcontroller and experiments were carried out ot verify the simulation results.

• Journal of international Conference on Electrical Machines and Systems
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• 제1권2호
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• pp.38-45
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• 2012

A novel kind of switched reluctance motor (SRM) with short flux path is proposed in this paper. Phase excitation in the SRM gives short flux paths, hence reducing the magnetomotive force required to drive the machine, resulting in significant reduction of copper wire and core losses compared to the typical SRM with diametric circulation of magnetic flux. To verify the performance, the characteristics analysis of a double-stator SRM, a 6/5 SRM with C-core structure, and a 4/5 two-phase SRM, which all have short flux paths, and a comparison with conventional SR motors are executed. The comparison demonstrates that the proposed motor offers some advantages in terms of torque and efficiency.

• Journal of Magnetics
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• 제19권3호
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• pp.282-290
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• 2014

This paper discusses the development of a 3.5 kW switched reluctance motor (SRM)-based electric air-conditioning (AC) compressor, focusing primarily on the design aspects of the SRM and the integrated controller. In addition to the increased price of rare-earth magnets, SRM's operation capability at high speed and high temperature makes the SRM a viable alternative to the permanent magnet motor for electrically driven automotive air conditioning compressors. A compact and energy efficient scroll compressor is designed and constructed. Two feasible SRM topologies are considered, in terms of efficiency, torque ripple, and acoustic noise. Compact drive electronics are designed and employed to drive the SRM-based compressor. The static and dynamic performance is validated by simulation and experiment.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2002년도 전력전자학술대회 논문집
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• pp.423-426
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• 2002

This paper presents a new analytical representation and simulation of the phase inductance of a Switched Reluctance Motor(SRM) using Matlab/M-file. This simulation method has many advantages: it is free from expression, can be applied widely, demonstrates inductance profile using motor parameter only, and save run time. Moreover, this simulation method can be easily realize various SRM model unlikely the existing method that limited itself to one model. And analytical expression for inductance profile is welcome as it allows for easier analysis of the motor, for it can bring insight in it working, in formulating control strategies and in achieving high accuracy in performance computations.

• 전기학회논문지
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• 제63권11호
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• pp.1511-1518
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• 2014

Demand for high fuel efficiency and smart features of the vehicles, research has been intensified. Hence, research and development on electric power steering (EPS) system to replace the existing hydraulic steering system has been actively conducted. Permanent magnet motors are widely used in automotive applications due to their high power density and high efficiency. However, increasing price and limited production of rare-earth permanent magnets has recently prompted the auto parts makers to substitute permanent magnet motors by non- or less rare earth magnet motors. Switched reluctance motors SRMs), known as typical non-rare earth motors have simple structure, low manufacturing cost, and high reliability. This paper discusses design, modeling, simulation, and experimental verification of a prototype SRM drive for electric power steering system.

• KIEE International Transaction on Electrical Machinery and Energy Conversion Systems
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• 제2B권3호
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• pp.95-99
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• 2002

This paper deals with the influence of the various stator structures in a Switched Reluctance Motor (SRM) on the vibration behaviors. The stator part in SRMs produces most vibrations. Therefore, the geometric design of the stator is necessary to reduce the vibration. The free and forced vibrations for four different stator yoke structures are analyzed by the electromagnetic and structural Finite Element Method (FEM). Then vibration stator structure that offers less is proposed. The modal analysis results of a tested motor are compared with measurements.

• Journal of international Conference on Electrical Machines and Systems
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• 제1권3호
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• pp.336-346
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• 2012

In this paper, a novel bearingless switched reluctance motor (BLSRM) with hybrid stator poles is proposed. The structure and operating principle are presented. In order to describe the design methodology clearly, analytical torque and radial force models are established. Further, basic design procedure is described. The numbers of phases and poles have important influence on the selection of structure. These effects, along with sizing of machine envelope and internal dimensions, make the machine design an insight-intensive effort. Effect of pole arcs and air-gap length on the production of torque and radial force are analyzed in detail. Mechanical design factors such as hoop stress and first critical speed are also considered. Based on the above analysis, the characteristics of the proposed BLSRM are analyzed. A prototype motor is designed and manufactured. The validity of the proposed structure is verified by the experimental results.

• 전기학회논문지
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• 제61권12호
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• pp.1836-1842
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• 2012

Torque is proportional to the rate of change of inductance in a switched reluctance motor (SRM), and hence, phase inductance is an important parameter in determining the behavior of an SRM. Therefore, the accurate prediction of inductance with respect to rotor position makes a significant contribution to designing an SRM and its analytical approach is not straightforward due to nonlinear flux distribution. Although several different approaches using a finite element analysis (FEA) or curve-fitting tool have been employed to compute phase inductance [2-5], they are not suitable for a simple design procedure because the FEA necessitates a large amount of time in both modeling and solving with complexity for every motor design, and the curve-fitting requires the data of flux linkage from either an experimental test or an FEA simulation. In this paper, phase inductance is predicted by means of a permeance method, and the proposed approach is analytically verified in terms of the accuracy of estimated inductance compared to inductance obtained by FEA.