著者

Duc Pham Leo Vijay Pugazhenthi Georg Tobias Götz Rik W. De Doncker

出版者

The Institute of Electrical Engineers of Japan

雑誌

IEEJ Journal of Industry Applications (ISSN:21871094)

巻号頁・発行日

vol.10, no.6, pp.748-754, 2021-11-01 (Released:2021-11-01)

参考文献数

12

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Owing to the robust structure of switched reluctance machines, high-speed operations are preferred to achieve higher power densities. Generally, at high speeds, single pulse control is applied. However, its control parameter set is not unique. This paper proposes an algorithm based on design of experiments that simultaneously allows the calculation of optimal control parameters for an operating area and the minimization of the total machine losses. The designed experiments are finite-element analyses (FEAs) considering both iron and copper losses. A Pareto search algorithm solves the proposed multi-objective optimization problem. The results for different response surfaces are compared considering the errors in torque production and machine loss prediction. A reduced response surface based on 15 FE-runs shows a mean error of 1.9%, whereas the maximum error is 6.3% for machine losses within the validation operating area.

著者

Stefan Quabeck Wenbo Shangguan Daniel Scharfenstein Rik W. De Doncker

出版者

The Institute of Electrical Engineers of Japan

雑誌

IEEJ Journal of Industry Applications (ISSN:21871094)

巻号頁・発行日

vol.10, no.6, pp.688-693, 2021-11-01 (Released:2021-11-01)

参考文献数

20

---

Induction machines are used in a wide range of industrial applications due to their simplicity, ruggedness, and low price. Despite their robustness, induction machines eventually fail due to a variety of mechanisms. Most faults exhibit specific frequency components in the motor current spectrum, which allows for fault detection. Many classical fault detection methods have been developed for grid-connected machines with relatively fixed operating points. In inverter-driven machines with a wide operating range, these methods cannot reliably detect and classify faults. Machine learning methods have been successfully used for various classification tasks. This study therefore combines classical fault detection approaches with various fault classification algorithms to reliably detect induction machine faults over a wide operating range.The developed fault classification method is evaluated using steady-state measurements on an inverter-fed 5.5 kW induction machine. The algorithm shows promising fault detection and classification capabilities, achieving an accuracy of 97.4% over a wide load range.

著者

Marika Kobayashi Shigeo Morimoto Masayuki Sanada Yukinori Inoue

出版者

The Institute of Electrical Engineers of Japan

雑誌

IEEJ Journal of Industry Applications (ISSN:21871094)

巻号頁・発行日

vol.10, no.6, pp.675-681, 2021-11-01 (Released:2021-11-01)

参考文献数

24

---

Irreversible demagnetization analysis is complicated in motors with bonded magnets that have unique B-H curves and do not exhibit distinct knee points. We have proposed a permanent magnet assisted synchronous motor (PMASynRM) with bonded magnets and examined its demagnetization characteristics by assuming the relative recoil permeability (μrec) as constant to simplify the analysis. However, the present recoil loop measurements of bonded magnets show that μrec has different characteristics depending on the magnitude of the reverse magnetic field intensity at the working point of the magnet and temperature. Therefore, this study presents a demagnetization analysis method based on these measurement results and investigates the demagnetization characteristics of a PMASynRM considering the variation in μrec for bonded magnets. The results of the demagnetization analysis considering the variation in μrec are compared with those where μrec is assumed to be constant. The comparison results indicate that there is no problem with assuming a constant μrec of 1.15 in the demagnetization analysis of a motor with bonded magnets.

著者

Atsushi Okada Ami S. Koshikawa Kouki Yonaga Kensuke Sasaki Takashi Kato Masayuki Ohzeki

出版者

The Institute of Electrical Engineers of Japan

雑誌

IEEJ Journal of Industry Applications (ISSN:21871094)

巻号頁・発行日

vol.10, no.6, pp.618-623, 2021-11-01 (Released:2021-11-01)

参考文献数

14

被引用文献数

1

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This study proposes a novel approach that employs the kernel method as a regression model to demonstrate the dependency of magnet flux linkage on the applied current, which is suitable for magnet temperature estimation. This model can estimate the flux linkage with a mean relative error of less than 2% in comparison with that obtained using finite element analysis. The magnet temperature is estimated by comparing the magnet flux linkage under loading conditions with the values obtained from the regression models built under fixed temperatures. The accuracy of the results obtained using the magnet temperature estimation method is approximately the same as that of the results obtained using the look-up table, suggesting that the proposed approach is suitable for non-linear motor property modeling.

著者

Katsutoku Takeuchi Makoto Matsushita Yuichi Tsuboi Naoyuki Amemiya

出版者

The Institute of Electrical Engineers of Japan

雑誌

IEEJ Journal of Industry Applications (ISSN:21871094)

巻号頁・発行日

vol.10, no.5, pp.577-588, 2021-09-01 (Released:2021-09-01)

参考文献数

20

被引用文献数

1

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To perform finite element analysis (FEA) for estimating the characteristics of synchronous machines (SMs), a current condition corresponding to an operating point is necessary as an analysis input. Accurate identification for the current condition is a difficult problem because it is strongly susceptible to magnetic saturation, e.g., the cross-coupling saturation between d- and q-axes. Especially in a wound-field SM, its flexibility makes the identification more complicated; in other words, three independent variables, such as the amplitude and phase of armature current and amplitude of field current, have to be identified for SMs, whereas two variables are required for a permanent magnet SM or synchronous reluctance machine. Thus, numerous researchers have studied construction of the identification method. This paper proposes a novel identification method for the current condition of wound-field SMs using saturation functions defined by the flux maps. It is demonstrated that the proposed method can correctly identify a large number of current conditions in a short computation time. In addition, the influences of magnetic saturation on the characteristics of the SM were investigated by comparing the identification results obtained by the linear and nonlinear FEA. It is revealed that the magnetic saturation drastically affects the current condition and must be considered in the identification methodology.

著者

Noriya Nakao Kazuaki Tobari Tomohiro Sugino Yoshiki Ito Mitsuhiro Mishima Daisuke Maeda

出版者

The Institute of Electrical Engineers of Japan

雑誌

IEEJ Journal of Industry Applications (ISSN:21871094)

巻号頁・発行日

vol.10, no.4, pp.497-505, 2021-07-01 (Released:2021-07-01)

参考文献数

9

被引用文献数

10

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This paper presents a control scheme for smooth torque production in permanent-magnet synchronous motor drives. The proposed control scheme consists of two techniques: a feedforward compensation for torque ripple minimization and an online parameter estimation technique for harmonic fluxes. The feedforward compensation is constructed on a position-sensorless vector control system and generates voltage commands to suppress torque ripples. The command calculation process requires the parameters of the harmonic fluxes; therefore, the proposed control scheme includes their estimator and calculates them from detected current information. These techniques are simpler than existing ones and can be implemented on a computational device with a small amount of calculation load. The proposed control scheme is verified by performing simulations and experiments.

著者

Kantaro Yoshimoto Tomoyuki Hanyu

出版者

The Institute of Electrical Engineers of Japan

雑誌

IEEJ Journal of Industry Applications (ISSN:21871094)

巻号頁・発行日

vol.10, no.4, pp.411-416, 2021-07-01 (Released:2021-07-01)

参考文献数

6

被引用文献数

26

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Nissan has developed a 100% electrified powertrain system called e-POWER, which exhibits key features such as quick response, smooth acceleration, smooth deceleration, and quietness. The quick response and smooth acceleration can be achieved owing to the 100% electric motor drive and control strategy that has been adopted from the Nissan LEAF electric vehicle and improved further. The quietness was designed and controlled using power generation control and engine speed control. A driving mode called the e-POWER drive mode was developed using 100% electric deceleration to achieve smooth and efficient deceleration with linearity and controllability.

著者

Yuta Teshima Nobuto Hirakoso Yoichi Shigematsu Yusuke Hirama Hironoshin Kawabata

出版者

The Institute of Electrical Engineers of Japan

雑誌

IEEJ Journal of Industry Applications (ISSN:21871094)

巻号頁・発行日

vol.10, no.3, pp.303-309, 2021-05-01 (Released:2021-05-01)

参考文献数

8

被引用文献数

1 5

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Solar electric vehicles (EVs) can travel a long distance by generating electricity from panels mounted on them. The solar EV can generate a sufficient amount of electricity in fine weather. However, the amount of power generation decreases in cloudy weather. Therefore, to improve the cruising range of solar EVs, it is important to optimize a driving plan and to design a vehicle with good mechanical performance. By defining a evaluation function as time integration of the vehicle's energy balance, this study proposes an optimization theory that takes the variation of weather into account. Then, it proposes two types of solutions: the iterative calculation method and the sequential calculation method. The effectiveness of the theory is verified by simulating actual driving.

著者

Takehiro Imura Kenta Suzuki Katsuhiro Hata Yoichi Hori

出版者

The Institute of Electrical Engineers of Japan

雑誌

IEEJ Journal of Industry Applications (ISSN:21871094)

巻号頁・発行日

vol.10, no.3, pp.339-347, 2021-05-01 (Released:2021-05-01)

参考文献数

22

被引用文献数

5

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This study analyzes and evaluates four transmission characteristics of the capacitive power transfer (CPT) with resonance coupling. A constant voltage source is used under all conditions. The target compensation topologies for the investigation are series-series (SS), series-parallel (SP), parallel-series (PS) and parallel-parallel (PP) topologies. The analysis results under the unified conditions describe the five transmission characteristics: (a) the equivalent maximum efficiency in four topologies, (b) the squared lower output power of the coupling coefficient of PS and PP topologies compared with those of SS and SP topologies, (c) the squared lower optimal loads of the coupling coefficient of SS and PS topologies compared with those of SP and PP topologies, (d) the constant unit power factor (CUPF) characteristics from the source in four topologies, (e) the constant current (CC) characteristics in SS and PP topologies, and the constant voltage (CV) characteristics in SP and PS topologies at the load variation around the optimal load. From these evaluations, both SS and SP topologies, which are superior in terms of the output power, are recommended when using the voltage source. Finally, the powering experiment in SS and SP topologies shows the effectiveness of these evaluations.

著者

Shuntaro Inoue Kenichi Itoh Masanori Ishigaki Takahide Sugiyama

出版者

The Institute of Electrical Engineers of Japan

雑誌

IEEJ Journal of Industry Applications (ISSN:21871094)

巻号頁・発行日

vol.9, no.6, pp.713-722, 2020-11-01 (Released:2020-11-01)

参考文献数

40

被引用文献数

4

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This paper discusses a design method for a proposed integrated magnetic component for an isolated bidirectional three-port DC-DC converter (TPC). TPC comprises a dual active bridge converter (DAB) and a non-isolated bidirectional DC-DC converter (NBC); each converter is independently controlled with a transformer and a magnetically coupled inductor. To reduce the size of the magnetic components, an integrated magnetic component that can integrate a magnetically coupled inductor and a transformer is implemented. A 750-W magnetically integrated TPC prototype was constructed and tested to validate the operation. The experimental results show that the efficiency of the integrated TPC is above 90% for the entire output power range, which is nearly equal to that of the conventional magnetic component. As a result, the proposed component was 10% smaller than the conventional magnetic components, and the overall size of the integrated TPC was 33% smaller than that of the conventional one.

著者

Hiroki Kurumatani Yuuki Inoue Satoshi Nishimura Masahiko Isaka Ryo Shimane Takuya Tanaka Seiichiro Katsura

出版者

The Institute of Electrical Engineers of Japan

雑誌

IEEJ Journal of Industry Applications (ISSN:21871094)

巻号頁・発行日

vol.8, no.4, pp.576-585, 2019-07-01 (Released:2019-07-01)

参考文献数

18

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High-speed and high-precision weighing is required in industrial and medical fields. Recently, medical services have improved rapidly and the demand for medicines have increased. Because improper medication can lead to life-threatening symptoms, precise filling and weighing all medicines are vital processes. On the other hand, there are requirements from suppliers to increase production volume. For this problem, Reduction the time by applying vibration-suppression control for a weighing cell is presented. The weighing cell exhibits oscillating responses as it has vibration mechanism inside. This vibration increases the weighing time and then reflected-wave rejection is introduced to suppress the vibration. Because reflected-wave rejection is a phase-stabilizing method, the controller attains a robustness against modeling errors. As a result, the weighing cell did not vibrate regardless of existence of a load. In addition, lift-up operations of vial bottles with water by the weighing cell were also conducted. The water surface did not fluctuate and immediately settled. Reflected-wave rejection certainly contributes to reducing the time for weighing.

著者

Hiroshi Fujimoto Koichi Sakata

出版者

The Institute of Electrical Engineers of Japan

雑誌

IEEJ Journal of Industry Applications (ISSN:21871094)

巻号頁・発行日

vol.3, no.3, pp.270-276, 2014 (Released:2014-05-01)

参考文献数

17

被引用文献数

3 6

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Motion control techniques are employed for nanoscale positioning in industrial equipment such as numerical control (NC) machine tools and exposure systems. The advanced motion control techniques are based on precise current control. However, speeding up the precise current response causes a serious limitation owing to the carrier period of the inverter. In addition, the position response has to be slower than the current response. In a previous paper, we designed and fabricated an experimental precision stage, achieving novel ultrahigh-speed nanoscale positioning based on multirate pulse width modulation (PWM) control. However, it was difficult to achieve faster and more precise positioning because of the resonance modes of the stage. In this paper, we propose a multirate PWM control in which the resonance mode is considered. Simulations and experiments are performed to demonstrate the advantages of the proposed method.

著者

Sho Sakaino Tomoki Sakuma Toshiaki Tsuji

出版者

The Institute of Electrical Engineers of Japan

雑誌

IEEJ Journal of Industry Applications (ISSN:21871094)

巻号頁・発行日

vol.8, no.2, pp.279-286, 2019-03-01 (Released:2019-03-01)

参考文献数

34

被引用文献数

3

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Electro-hydrostatic actuators (EHAs) are hydraulic systems that operate without control valves, making them a compact, cheap, and highly energy efficient system. However, resonance, static friction, and oil leakage degrade their control performance. Three controllers are integrated to overcome these issues. First, static friction is suppressed by a feedback modulator (FM). Input torque is quantized to exceed the maximum static friction force, and quantization errors are suppressed by the FM. Second, resonance is canceled out by a self resonance cancellation (SRC) technique. In the SRC, both angle responses of a hydraulic pump and a hydraulic motor are measured, and the rigid body mode is extracted. Then, resonance becomes unobservable, changing the system as a second-order system. Third, modeling errors, including oil leakage, are suppressed by a self resonance cancellation disturbance observer (SRCDOB). As the SRCDOB is implemented in the rigid body mode, the cut-off frequency of the SRCDOB can be greater than that of most common disturbance observers. This combination of controllers drastically improves the control performance, and it enables control system design based on frequency.

著者

Dragan Stamenkovic Drazen Dujic

出版者

The Institute of Electrical Engineers of Japan

雑誌

IEEJ Journal of Industry Applications (ISSN:21871094)

巻号頁・発行日

vol.9, no.3, pp.244-253, 2020-05-01 (Released:2020-05-01)

参考文献数

24

被引用文献数

2

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An LLC series resonant converter presents a viable opportunity for the realization of a DC solid-state transformer. As the DC-based power system increasingly garners the attention of academia and industry, the need for reliable, economical and efficient voltage transformation with galvanic isolation has emerged. The integrated gate-commutated thyristor (IGCT) is an attractive switch for such implementation because of its advantages over the insulated gate bipolar transistor, namely the lowest conduction losses in the class. This work shows that the IGCT can be easily implemented as a switching element in a resonant converter without the need for the protective clamping circuit. Resonant switching operation is demonstrated and supported by experimental data, and high efficiency is confirmed at high switching frequencies.

著者

Van-Long Pham Keiji Wada

出版者

The Institute of Electrical Engineers of Japan

雑誌

IEEJ Journal of Industry Applications (ISSN:21871094)

巻号頁・発行日

vol.9, no.3, pp.227-234, 2020-05-01 (Released:2020-05-01)

参考文献数

19

被引用文献数

4

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This paper proposes a normalization design for series inductances in a triple active bridge (TAB) converter. The voltage variations and inductances are normalized based on percentage, and the complicated relationships between the elements of the TAB converter are clarified. The limitation of inductances corresponding to the different voltage variations is specified. The inductances are designed by considering the operation range of the phase shift angles. Based on this, the proposed method allows the inductances in TAB converter to be designed for various applications. A prototype converter rated at 200V and 500W is implemented to verify the proposed method. The experimental results show that the converter can operate under the rated power, indicating that the proposed method can be applied for designing of a TAB converter.

著者

Jan Swevers Laurens Jacobs Taranjitsingh Singh Dora Turk Maarten Verbandt Goele Pipeleers

出版者

The Institute of Electrical Engineers of Japan

雑誌

IEEJ Journal of Industry Applications (ISSN:21871094)

巻号頁・発行日

vol.9, no.2, pp.109-116, 2020-03-01 (Released:2020-03-01)

参考文献数

11

被引用文献数

5

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Optimal linear feedback controller synthesis methodologies have the potential to become a worthy alternative to standard design methodologies, particularly for high-end complex systems. Although these design methodologies have been around for more than two decades, the majority of industrial control engineers are still reluctant to adopt this new design paradigm. Motivated by these observations, the MECO Research Team at KU Leuven is developing a Linear Control Toolbox (LCToolbox). LCToolbox is an open-source ᴍᴀᴛʟᴀʙ toolbox providing a high level of abstraction to apply linear optimal controller design methods. Its key features are the signal-based modeling framework that allows the user to construct the control configuration, the identification module that interfaces several routines in a uniform manner, and the control module that allows the user to specify an optimal feedback controller design problem in an intuitive way and solve it as such. Moreover, LCToolbox supports state-of-the-art B-spline-based linear parameter-varying (LPV) modeling and controller design techniques, unlocking the true potential of advanced feedback controller synthesis methodologies. The design of an LPV controller for an overhead crane is used as a running example throughout the paper to illustrate all features of LCToolbox.

著者

Masamichi Tanemo Koki Matsudate Shinichi Nomura

出版者

The Institute of Electrical Engineers of Japan

雑誌

IEEJ Journal of Industry Applications (ISSN:21871094)

巻号頁・発行日

vol.9, no.1, pp.73-81, 2020-01-01 (Released:2020-01-01)

参考文献数

6

被引用文献数

3

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This work discusses the feasibility of series/parallel switching circuits with power MOSFETs to minimize the reduction in the output power of photovoltaic power systems due to the partial shading problems by connecting shaded panels and adjacent panels in parallel. The following observations were made on the basis of the experimental results: 1) When at least one of the photovoltaic panels is shaded, 50% of the reduction ratio of the solar radiation intensity becomes the lower limit of the threshold value for the series/parallel switching control. 2) The effect of the series/parallel switching control can be expected to be higher when more than two of the photovoltaic panels are shaded. However, the sum of the solar radiation intensities applied to the panels in the parallel circuit should be less than 150% of the maximum intensity of the photovoltaic power system. 3) The shaded panel, which should be connected to the adjacent panel in parallel, can be detected using bypass current measurements rather than direct measurements of the solar radiation intensity. The authors developed a prototype of a switching circuit module and performed the operation tests by using three photovoltaic panels. The results showed that the switching circuit module successfully detects the partial shading conditions and switches from the series operation mode to the parallel operation mode.

著者

Shun Ichikawa Masafumi Miyatake

出版者

The Institute of Electrical Engineers of Japan

雑誌

IEEJ Journal of Industry Applications (ISSN:21871094)

巻号頁・発行日

vol.8, no.4, pp.586-591, 2019-07-01 (Released:2019-07-01)

参考文献数

14

被引用文献数

6

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High-frequency train operation with a moving-block signaling system has begun to be introduced mainly in urban rail transit. Under high-frequency operation, however, subsequent trains can repeatedly be forced to slow down according to deceleration pattern generated by the signaling system to avoid collision with preceding trains, which increases the energy consumption of subsequent trains. In this paper, train trajectory optimization with dynamic programming is applied to evaluate the effect of considering preceding trains' trajectory on subsequent trains' energy reduction in a line with moving-block signaling system. The result shows that the method reduces the increase in energy consumption compared to the preceding train 1/3 times more than when not considering the position of the preceding train.

著者

Seiji Iyasu Yuji Hayashi Yuichi Handa Kimikazu Nakamura Keiji Wada

出版者

The Institute of Electrical Engineers of Japan

雑誌

IEEJ Journal of Industry Applications (ISSN:21871094)

巻号頁・発行日

vol.8, no.3, pp.437-443, 2019-05-01 (Released:2019-05-01)

参考文献数

14

被引用文献数

6

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Electric vehicles are equipped with an isolated DC-DC converter for controlling the bidirectional DC power flow. In this case, a current sensor was installed inside the circuit. This paper proposes a current sensor using current transformers for bidirectional DC-DC converters. The current sensor comprises a current transformer (CT), diode rectifier, and MOSFET. The current sensor can detect a pulse current containing a DC component without any magnetic saturation. This paper shows a circuit configuration of the bidirectional current sensor, and the principle of the bidirectional current detection of the sensor is analyzed. The validity of this analysis is verified through an experiment with the DC-DC converter rated at 150V and 1.4kW.

著者

Liudmila Popova Ke Ma Frede Blaabjerg Juha Pyrhonen

出版者

The Institute of Electrical Engineers of Japan

雑誌

IEEJ Journal of Industry Applications (ISSN:21871094)

巻号頁・発行日

vol.4, no.4, pp.380-386, 2015-07-01 (Released:2015-07-01)

参考文献数

20

被引用文献数

2 5

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Modular multilevel converter (MMC) is a recently emerged multilevel topology for high-voltage high-power applications. However, in wind power applications, to the best of the authors knowledge, the performance of the MMC has not been extensively investigated. In this paper, the application of the MMC to wind energy systems is studied. The converters used to connect the wind turbine to the grid, which have rated active powers of 2MW and 10MW, are proposed and investigated. The electrical losses and thermal loading of the power devices in the proposed converter solutions are analyzed based on the gird conditions/requirements for wind power. The efficiency of the MMC under different P/Q boundaries defined by grid codes is investigated and compared with two-level (2L) and three-level (3L) neutral point clamped converters. It is concluded that it is possible to use the MMC in wind power applications, and the losses are evenly distributed between the submodules of the MMC. However, inside a submodule, the losses of the power devices are not equal, which may lead to the de-rating of the converter.