巻号一覧
119 巻, 7 号
選択された号の論文の16件中1～16を表示しています
- |<
- <
- 1
- >
- >|
-
坂本 光雄1999 年 119 巻 7 号 p. 926-931
発行日: 1999/07/01
公開日: 2008/12/19
ジャーナル フリーPDF形式でダウンロード (4088K) -
長谷川 勝, 山崎 尚徳, 道木 慎二, 大熊 繁1999 年 119 巻 7 号 p. 932-941
発行日: 1999/07/01
公開日: 2008/12/19
ジャーナル フリーA new design method of the flux observer for the vector control is proposed in this paper. The newly designed observer estimates the flux within predetermined flux angle deviations. The characteristics are studied by Frequency Response Function (FRF) and the proposed designed method is shown to realize robust flux estimations. Then, the proposed observer is compared with the adaptive identifier, and they are shown to compensate with each other. Moreover, the proposed designed method is implemented in the vector control system and is shown feasible experimentally.抄録全体を表示PDF形式でダウンロード (1850K) -
木村 彰1999 年 119 巻 7 号 p. 942-949
発行日: 1999/07/01
公開日: 2008/12/19
ジャーナル フリーA scheduled operation control system for rolling stock is to make a train arrive at the next station on the scheduled time. This paper proposes a novel system which consists of a predetermined pattern and a control equipment. The pattern defines the relationship between time and the target location of the train. The control equipment compares the target location and the actual train location, and controls the train driving power according to the location difference.
When the train is delayed, the location difference becomes large. However, using this system, the train is accelerated more than the pattern speed. So that it recovers the time delay.
The train driving power is limited by the capacity of the traction circuits. Therefore, the control system is a nonlinear system. The system was analyzed and the compensating calculation method was obtained.
By the simulation, the delay recovering function was proved without causing overshoot and vibration of the driving power.抄録全体を表示PDF形式でダウンロード (1737K) -
近藤 圭一郎, 松岡 孝一, 山下 道寛, 土谷 武士1999 年 119 巻 7 号 p. 950-957
発行日: 1999/07/01
公開日: 2008/12/19
ジャーナル フリーDC electrified railway line voltage at pantograph often changes according to load condition of other electric vehicles. Vehicle propulsion system is disturbed by this line voltage change. For practical use it must be made clear how the permanent magnet synchronous motor control system for railway traction behaves at line voltage change. In this paper we try to analyze our proposed PMSM control system behavior under sudden change of DC line voltage through pole arrangement and numerical simulation and obtain technical knowledge under this phenomenon.抄録全体を表示PDF形式でダウンロード (1909K) -
大島 正明, 斉藤 亮治, 宇敷 修一, 山口 達史, 高野 誠治1999 年 119 巻 7 号 p. 958-969
発行日: 1999/07/01
公開日: 2008/12/19
ジャーナル フリーA non-uniformly connected single-phase rectifier with a novel constantly-sampled PWM scheme is trially fabricated and experimentally examined, the ratings of which are ac 100 V input, dc 200 V output, 1 kVA and 1.0 power factor. The applied PWM scheme assures theoretically the maximum error of the actual ac current to the reference one, zero-cross distortion free and the minimum on-state and off-state time durations of main switches. Both high speed dc voltage response and less distortion of ac input current are achieved by applying feedfoward control to the dc-AVR which functions as the upper stage of the PWM. The equivalent circuit was also derived for the rectifier theoretically. The resistive component decreases linearly with increase of the feedfoward gain and is inversely proportional to the dc voltage feedback gain. 95% efficiency, 100% power factor and 2% THD were measured. For full load shut-down, 1% and 20ms were obtained respectively for the transient dc voltage overshoot and the settling time. The measured equivalent circuit is in good agreement with the theoretically predicted one. The rectifier demonstrated quick and excellent performance.抄録全体を表示PDF形式でダウンロード (1792K) -
高橋 則雄, 柏野 猛, 宮田 浩二, 大橋 健1999 年 119 巻 7 号 p. 970-976
発行日: 1999/07/01
公開日: 2008/12/19
ジャーナル フリーThe permanent magnet type of MRI for whole body provides a viable alternative to resistive and superconducting MRI. As the permanent magnet assembly contains pole pieces and yokes which are made of steel, the minor loop of B and H of steel due to the pulse excitation and the eddy current induced in the steel affect the magnetic characteristics of permanent magnet assembly.
In this paper, the nonlinear iteration method for the analysis considering minor loop is discussed, and also the modeling technique of minor loop using typical major hysteresis loops is shown. The behavior of magnetic characteristics of permanent magnet assembly is examined considering hysteresis and eddy current. It is shown that the selection of time interval is important in the nonlinear analysis taking account of minor loop. The amplitude of residual magnetism is affected by the eddy current and the size of pole piece.抄録全体を表示PDF形式でダウンロード (2505K) -
杜 基雲, 松村 文夫1999 年 119 巻 7 号 p. 977-983
発行日: 1999/07/01
公開日: 2008/12/19
ジャーナル フリーIn this paper, we have studied characteristics and structure of a linear dc motor for a knitting machine. We propose a method to improve control performances. In the method, first, we have designed a two-degrees-of-freedom controller for high accurate and smooth position response. However, there is a limitation of control characteristics only using the controller. Next, using the fact that motion pattern of needle is repetitive at each cycle, we have designed a learning controller. At each trial, set desired signal is modified by the position, velocity, and acceleration errors for next trial, with the aim of progressively reducing the tracking errors. Through the experimental research of the control system, we present the idea that the response delay is a main cause of divergence in the learning control process. To solve this problem, leading of error and filtering compensation simultaneously is a very good method. Unstability which is taken place by the delay time is effectively eliminated. Some satisfactory results are obtained in experiments.抄録全体を表示PDF形式でダウンロード (3342K) -
高橋 則雄, 村松 和弘, 大歳 雅洋, 堀井 誠1999 年 119 巻 7 号 p. 984-993
発行日: 1999/07/01
公開日: 2008/12/19
ジャーナル フリーVarious optimization methods, such as Rosenbrock method (RBM), simulated annealing method (SAM), genetic algorithm (GA), evolution strategy (ES), are trying to be used in the optimal design of electrical machines and electronic equipment. In order to apply these optimization methods to the practical design of magnetic devices using the finite element method, problems in using the optimization methods, such as acceleration technique of the convergence of optimization method, effect of finite element subdivision on the obtained optimal value, should be investigated.
In this paper, effects of initial value, searching region, convergence criterion, number of elements on the obtained optimal value are examined using the die press model (Problem 25) which is the standard model of TEAM International Workshop. It is shown that the fine mesh having about 1% accuracy of flux density is necessary in order to obtain the optimal dimension having about 1% accuracy. The number of iterations of RBM and SAM can be reduced by using the initial value which is obtained using the experimental design method (EDM). Finally, features of RBM, SAM, ES and combination methods are compared with each other from the viewpoints of obtaining the global optimal value and quick convergence.抄録全体を表示PDF形式でダウンロード (1351K) -
松井 景樹, 近藤 晃平1999 年 119 巻 7 号 p. 994-1003
発行日: 1999/07/01
公開日: 2008/12/19
ジャーナル フリーThe five-level PWM inverters have many advantages such as an ability to operate the motor or the static var compensator (SVC) with nearly sinusoidal current waveforms. For these reasons, actual consideration of applications have just begun with great interest. In the discussion of applications, still larger capacity inverters are also expected. In order to increase the capacities of switching device, a certain technique and controlling methods are proposed for the parallel connections of the five-level PWM inverters. In high-power applications, however, the carriers should be synchronized to modulating sinusoidal waves. In addition, each three phase waveform should be built in a bilateral symmetry for each half-wave as well as the horizontal axis symmetry. Moreover, for the current sharing reactor, lower order harmonic application is prohibited. To improve the harmonic characteristic of the parallel connected three phase five-level inverters, various modulation strategies are devised and discussed.抄録全体を表示PDF形式でダウンロード (1508K) -
井出 一正, 島 和男, 高橋 身佳1999 年 119 巻 7 号 p. 1004-1009
発行日: 1999/07/01
公開日: 2008/12/19
ジャーナル フリーThis paper describes a simple analysis method of induced damper bar currents of salient-pole synchronous machines due to stator slot ripple and the calculated results of the damper bar currents of a 250kW 4-poles machine.
The proposed method is based on a gap permeance model of salient-pole machines considering the peripheral variation of the gap permeance and the field mmf distribution. The damper bar currents are calculated by considering the peripheral positions of the damper bars. The validity of the proposed analysis method is shown by the good agreement with the measured currents and analyzed currents by the two dimensional electromagnetic field analysis, of the 250kW 4-poles machine. Therefore it is useful for practical damper bar designers, because of its simpleness to be used and its accuracy of the analyzed currents.抄録全体を表示PDF形式でダウンロード (1681K) -
開道 力, 竹田 和年, 脇坂 岳顕, 溝上 雅人1999 年 119 巻 7 号 p. 1010-1015
発行日: 1999/07/01
公開日: 2008/12/19
ジャーナル フリーMagnetic and mechanical characteristics of adhesive coating non-oriented electrical steel sheet cores were measured in the conditions of motor, comparing with those of welded cores. The deteriorations of iron losses and exciting currents by adhesion are less than those by welding. The noise levels and vibrating levels of adhesive coating cores are about 10dB lower than welded cores. The results of modal analysis of adhesive coating core and welded one support the results of noise and vibration tests. The heat conductivities of adhesive coating cores in lamination direction are higher.抄録全体を表示PDF形式でダウンロード (3499K) -
堀口 光敏1999 年 119 巻 7 号 p. 1016-1017
発行日: 1999/07/01
公開日: 2008/12/19
ジャーナル フリーThe turn-ratio test is required in single phase induction motor to obtain the data necessary to segregate the losses. In this study, for the single phase induction motors for general purpose that are used widely as single phase induction motors it is discussed that the turn-ratio can be derived from the data obtained in the experiment similar to the locked rotor test for the determination of load characteristics in a polyphase induction motor.抄録全体を表示PDF形式でダウンロード (1204K) -
花澤 民雄, 江頭 虎夫1999 年 119 巻 7 号 p. 1018-1019
発行日: 1999/07/01
公開日: 2008/12/19
ジャーナル フリーUniversal motors are compact, lightweight and high-revolving, and are widely used for the cleaners, electric tools, etc. However, universal motors have some problems. They generate the commutation sparks which cause wear on the brush and noise impediments. Therefore, we attempted to use a high-speed camera to visually elucidate the commutation spark mechanism. We reported the large pulses of the armature terminal voltage leading to the generation of commutation sparks. This time we accelerated the photographing speed, and probed commutation sparks which occur when the large pulses begin to decrease at the peak.抄録全体を表示PDF形式でダウンロード (1849K) -
Guoguang Zhang, Junji Furusho1999 年 119 巻 7 号 p. 1020-1021
発行日: 1999/07/01
公開日: 2008/12/19
ジャーナル フリーPDF形式でダウンロード (144K) -
三浦 友史, 松川 誠, 中野 博民1999 年 119 巻 7 号 p. 1022-1023
発行日: 1999/07/01
公開日: 2008/12/19
ジャーナル フリーPDF形式でダウンロード (1063K) -
茂木 進一, 清水 一彦, 前田 明志1999 年 119 巻 7 号 p. 1024-1025
発行日: 1999/07/01
公開日: 2008/12/19
ジャーナル フリーPDF形式でダウンロード (1367K)
- |<
- <
- 1
- >
- >|