• 전기전자학회논문지
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• 제26권2호
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• pp.280-286
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• 2022

본 논문에서는 Digital Signal Processor(DSP)와 PLECS 소프트웨어를 사용하여 영구자석동기전동기(Permanent Magnet Synchronous Machine, PMSM)를 위한 Rapid Control Prototyping (RCP)를 구현하였다. PLECS의 Auto-code generation(ACG) 기능을 활용하여 제어 프로세서를 DSP로 사용하는 PMSM 구동 시스템에 대한 현재 벡터 제어 알고리즘을 보다 상대적으로 간단하고 효율적으로 개발할 수 있다. 본 논문에서는 모델 기반 설계(Model Based Design, MBD)와 real time control(실시간 제어) 배경을 살펴본다. 또한, DSP 보드와 호환되는 상용 RCP 제품 및 실험을 통한 PMSM 드라이브 제어를 구현하였다.

• Journal of Electrical Engineering and Technology
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• 제2권4호
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• pp.468-477
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• 2007

The DTC of voltage source inverter-fed PMSMs is based on hysteresis controllers of torque and flux. It has several advantages, namely, elimination of the mandatory rotor position sensor, less computation time, and rapid torque response. In addition, the stator resistance is the only parameter, which should be known, and no reference frame transformation is required. The DTC theory has achieved great success in the control of induction motors. However, for the control of PMSM drives proposed a few years ago, there are many basic theoretical problems that must be clarified. This paper describes an investigation into the effect of the zero voltage space vectors in the DTC system and points out that if using it rationally, not only can the DTC of the PMSM drive be driven successfully, but torque and flux ripples are reduced and overall performance of the system is improved. The implementation of DTC in PMSM drives is described and the switching tables specific for an interior PMSM are derived. The conventional eight voltage-vector switching table, which is namely used in the DTC of induction motors does not seem to regulate the torque and stator flux in a PMSM well when the motor operates at low speed. Modelling and simulation studies have both revealed that a six voltage-vector switching table is more appropriate for PMSM drives at low speed. In addition, the sources of difficulties, namely, the error in the detection of the initial rotor position, the variation of stator resistance, and the offsets in measurements are analysed and discussed.

• Journal of Power Electronics
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• 제13권6호
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• pp.939-954
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• 2013

The Direct Torque Control (DTC) technique for Permanent Magnet Synchronous Motors (PMSM) is receiving increased attention due to its simplicity and robust dynamic response when compared with other control techniques. The classical switching table based DTC results in large flux and torque ripples in the motors. Several studies have been reported in the literature on classical DTC. However, there are only limited studies that actually discuss or evaluate the classical DTC. This paper proposes, novel switching table / DTC methods for PMSMs to reduce torque ripples. In this paper, two DTC schemes are proposed. The six sector and twelve sector methodology is considered in DTC scheme I and DTC scheme II, respectively. In both DTC schemes a simple modification is made to the classical DTC structure. The two level inverter available in the classical DTC is eliminated by replacing it with a three level Neutral Point Clamped (NPC) inverter. To further improve the performance of the proposed DTC scheme I, the available 27 voltage vectors are allowed to form different groups of voltage vectors such as Large - Zero (LZ), Medium - Zero (MZ) and Small - Zero (SZ), where as in DTC scheme II, all of the voltage vectors are considered to form a switching table. Based on these groups, a novel switching table is proposed. The proposed DTC schemes are comparatively investigated with the classical DTC and existing literatures through theory analysis and computer simulations. The superiority of the proposed DTC method is also confirmed by experimental results. It can be observed that the proposed techniques can significantly reduces the torque ripples and improves the quality of current waveform when compared with traditional and existing methods.

• 한국인터넷방송통신학회논문지
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• 제22권4호
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• pp.127-132
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• 2022

철도차량에 탑재된 전장품 중 가장 큰 하중을 차지하는 것은 주변압기로 낮은 운전 주파수(60Hz)로 인해 전력밀도가 0.2~0.4 MVA/ton 정도로 낮아 경량화에 중요한 요소로 작용하고 있다. 따라서 철도차량용 주변압기를 개선하기 위해 몰드 변압기, 반도체 변압기 등에 관한 연구가 국내외적으로 활발히 진행 중이다. 한편 국내외 철도차량에 대부분 적용되는 견인전동기로 최근에는 유도전동기를 대체하여 영구자석 동기전동기(PMSM)를 적용하려는 시도가 이루어지고 있다. 영구자석 동기전동기(PMSM)는 유도전동기에 비해 높은 출력밀도와 효율 확보가 가능하지만 제작에 필요한 재료의 가격이 비싸고 설계가 유도전동기 대비 다소 어렵다는 단점이 있다. 이러한 문제점을 고려하여 본 논문에서는 소형 경량화가 가능한 반도체 변압기를 적용하고, 철도차량의 경량화, 고효율화 등의 요구사항에 맞춰 구조가 간단하면서 회전수가 높고 고토크, 저비용인 SRM을 적용할 수 있는 연구내용을 제안하고자 한다.