巻号一覧
121 巻, 11 号
選択された号の論文の15件中1～15を表示しています
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松井 信行, 大前 力, 河村 篤男2001 年 121 巻 11 号 p. 1105-1110
発行日: 2001/11/01
公開日: 2008/12/19
ジャーナル フリーPDF形式でダウンロード (1344K) -
Mario Cacciato, Alfio Consoli, Giuseppe Scarcella, Antonio Testa2001 年 121 巻 11 号 p. 1111-1116
発行日: 2001/11/01
公開日: 2008/12/19
ジャーナル フリーConducted emissions are caused by circulation of high frequency common mode currents generated by steep variations of the common mode voltage. In this paper, an inexpensive technique is presented that allows to noticeably reduce conducted electromagnetic emissions of multi-inverter drive systems by compensating common mode voltage variations.抄録全体を表示PDF形式でダウンロード (1687K) -
山本 修, 平原 英明, 荒 隆裕2001 年 121 巻 11 号 p. 1117-1125
発行日: 2001/11/01
公開日: 2008/12/19
ジャーナル フリーThis paper presents a method to calculate the characteristics of linear induction motors by a simple standstill testing method using a small-capacity DC power supply unit, tentatively called the DC decay testing method. This method can determine by a single test the accurate impedance of linear induction motors from the vicinity of commercial frequencies to less than 0.1Hz. The characteristics at each slip are predicted using the two-reaction theory. Comparisons of measured and calculated results for starting thrusts and starting currents demonstrate the validity of the proposed testing method. In addition, we evaluate how conditions (i.e., gap, structure and material) of the secondary-side conductor affect the linear induction motor's performance, i.e., thrust, current and impedance characteristics as calculated by the proposed testing method. This method is suited to calculating the performance of linear induction motors because it does not require no-load tests, which is difficult to carry out for linear induction motor for control use, or locked tests, where the mover must be braked.抄録全体を表示PDF形式でダウンロード (1712K) -
森本 茂雄, 木下 健次, 武田 洋次2001 年 121 巻 11 号 p. 1126-1133
発行日: 2001/11/01
公開日: 2008/12/19
ジャーナル フリーThe high-performance drives of synchronous motors such as a permanent magnet synchronous motor and a synchronous reluctance motor can be achieved by the current vector control. In such drive system, the armature current is controlled as a sinusoidal waveform based on the rotor position information from a high-resolution position sensor and the current vector (d and q-axis currents) is suitably controlled by the current feedback control.
This paper proposes the current sensorless drive system with a low-resolution position sensor in order to simplify the SM drive system. The high-performance current control is achieved in the proposed drive system, where the current sensors are eliminated and the simulated currents are used for current control. The low-resolution position sensor is used instead of a conventional high-resolution position sensor, and the higher position information is estimated. The steady-state and transient characteristics are examined by the several experiments with respect to the synchronous reluctance motor and the interior permanent magnet synchronous motor. It is confirmed that the sinusoidal current drive, the high-performance current vector control and the speed control can be achieved by the proposed drive system.抄録全体を表示PDF形式でダウンロード (1516K) -
谷口 博康, 中村 高宏, 古澤 春樹, 小沢 慎治2001 年 121 巻 11 号 p. 1134-1142
発行日: 2001/11/01
公開日: 2008/12/19
ジャーナル フリーTraffic flow measurement sensors using image processing are being installed. We have developed Directional-Temporal plane Transform (DTT) which transforms spatio-temporal images to 2D data on a directional-temporal plane as a vehicle recognition method. In the method, however, it is necessary to set the processing area for each lane to cover the moving paths of passing vehicles. Accordingly, the results of the method are affected by vehicles driving in other lanes under some camera conditions. In addition, the position accuracy of the method in the crossing direction is not sufficient, and as a result, it is unable to detect vehicles changing lanes. In this paper, we propose a vehicle recognition method that utilizes DTT and adaptively changes the processing areas by comparing the position of the areas with the position of 3D vehicle models. We also show the experimental results using real images.抄録全体を表示PDF形式でダウンロード (4098K) -
新中 新二2001 年 121 巻 11 号 p. 1143-1154
発行日: 2001/11/01
公開日: 2008/12/19
ジャーナル フリーThis paper newly examines and presents usefulness of recently proposed frequency-hybrid vector control scheme for sensorless induction motor drive through actual-machine-based performance evaluation tests. The scheme is characterized by utilizing a new indirect orientation scheme and a stable-filter-embedded direct orientation scheme, and exploiting their advantages. It is confirmed through the extensive tests by small to big standard motors such as 0.3, 3.7, 30 (kW) and special low-voltage motors dedicated to electric vehicles that the sensorless vector control scheme has the following potential usefulness: 1) it can make machines to produce more than 200% rated torque at standstill, 2) in both modes of motoring and regenerating, rated torque can be produced even in very slow speed range including zero-speed and zero-frequency, 3) for constant speed, good linearity of torque response is attained, 4) it has ability to make machines to track variable speed command of acceleration up to ±5, 000 (rad/s2) in mechanical frequency sense, 5) it can accept zero-speed command and settles the machines at a stable standstill with no-vibration, 6) it accepts instant injection of rated load even for zero-speed control, 7) it accommodates a load of huge inertia.抄録全体を表示PDF形式でダウンロード (4683K) -
徐 炳鴻, 辻 敏夫, 高橋 淳, 大内 繁男, 浜津 恭治, 飯島 雅彦2001 年 121 巻 11 号 p. 1155-1162
発行日: 2001/11/01
公開日: 2008/12/19
ジャーナル フリーThis paper proposes a sensorless drive system for Brushless DC (BLDC) motors using a Digital Phase Locked Loop (DPLL). The Back Electromotive Force (BEMF) voltage is measured from the motor windings to determine the permanent magnet rotor position using the DPLL, and a Pulse Width Modulation (PWM) limits the motor current for controlling the speed of BLDC motors. The proposed method can drive BLDC motors using an open loop control without stepping out. Also, the proposed method is compared with a control method with hall sensors, experimentally. Experimental results of the BLDC motor show the effectiveness of the proposed method.抄録全体を表示PDF形式でダウンロード (2472K) -
Masamitsu Inaba, Masahiro Iwamura, Noboru Akiyama, Michiaki Ono, Nobua ...2001 年 121 巻 11 号 p. 1163-1168
発行日: 2001/11/01
公開日: 2008/12/19
ジャーナル フリーA control IC has been developed that can provide a small flyback DC-DC converter without an optocoupler. This IC has new detection and control circuits using current mirrors and level-shift circuit technology. It reduces the mounting area of the DC-DC converter by 30%, and the DC-DC converter exhibits constant-voltage characteristics and conversion efficiency comparable to those of conventional converters.抄録全体を表示PDF形式でダウンロード (1809K) -
稲荷田 聡, 棚町 徳之助, 仲田 清2001 年 121 巻 11 号 p. 1169-1175
発行日: 2001/11/01
公開日: 2008/12/19
ジャーナル フリーIn Power converter system for AC Electric cars, DC voltage contains a ripple component with a frequency twice as high as the line voltage frequency, because of the single-phase voltage source. Therefore, an inverter current ripple and a torque ripple of motors connected with the inverter in the power converter occur. The feedfoward beatless control can restrain the current ripple and the toque ripple has been proposed. It compensates the inverter frequency based on the ripple component of DC voltage. However, it is difficult to minimize the ripple component of the inverter and torque with the beatless control, because optimal compensation gain and phase depend on inverter frequency and other parameters. This paper proposes a feedback beatless control can minimize the torque ripple of the motors with the d-q transformation and the torque current ripple feedback and shows the effectiveness of the beatless control with an experimental result.抄録全体を表示PDF形式でダウンロード (1430K) -
松岡 孝一, 近藤 圭一郎, 小林 芳隆, 白石 茂智2001 年 121 巻 11 号 p. 1176-1184
発行日: 2001/11/01
公開日: 2008/12/19
ジャーナル フリーIn the conventional rail vehicle, traction motor is mounted on the truck frame, and the shaft torque is transmitted to the wheel set via flexible coupling and reduction gearing. The reduction gearing is effective to increase the torque, but gives rise to maintenance, noise and transmission loss. To overcome these problems and simplify the truck structure, we conceived an idea of wheel mounted direct drive traction motor system without the reduction gearing, and started the development.
In this system, the traction motor is required to produce more torque and reduce the mass. So we introduced permanent magnet synchronous motor for the first time in the rail vehicle. Here, we propose fundamental structures of the wheel mounted direct drive traction motors, and present a prototype wheel mounted traction motor model, which is manufactured by trial as the first step of the development. We overcame the problem of temperature rise of permanent magnet, through analysis and improvement of the magnetic structure.抄録全体を表示PDF形式でダウンロード (2283K) -
浅野 能成, 本田 幸夫, 武田 洋次, 森本 茂雄2001 年 121 巻 11 号 p. 1185-1191
発行日: 2001/11/01
公開日: 2008/12/19
ジャーナル フリーConcentrated winding motors have a tendency to increase its vibration, and the vibration is bigger than distributed winding motors. This phenomenon is caused by tugging force between two neighboring teeth. Accordingly, we tried to reduce the vibration with considering radial stress of the motor. In this paper, it is shown that radial stress becomes partly big, and it makes excitation of stator core in natural mode of radial vibration. Therefore, air gap length where radial force is big should be enlarged. Furthermore, we found that radial stress in air gap becomes smoothly by enlarging air gap partly, and we can reduce the vibration the motors without decreasing its efficiency.抄録全体を表示PDF形式でダウンロード (1972K) -
門脇 悟志, 大石 潔, 宮下 一郎, 保川 忍2001 年 121 巻 11 号 p. 1192-1198
発行日: 2001/11/01
公開日: 2008/12/19
ジャーナル フリーWhen the adhesion force coefficient between rail and driving wheel decreases, the electric motor coach has slip phenomena. We have already proposed the anti-slip re-adhesion control system based on disturbance observer. This system has the fine torque response for one driving wheel driven by one inverter-fed induction motor. However, the bogie of electric motor coach has four driving wheels driven two induction motors, which are, in some cases, driven by one inverter. In order to realize the anti-slip re-adhesion control system for the bogie of electric motor coach, this paper proposes a new anti-slip re-adhesion control based on disturbance observer and speed sensor-less vector control. The numerical simulation and experimental results point out that the proposed anti-slip re-adhesion control system has the desired driving wheel torque response for the tested bogie system of electric motor coach.抄録全体を表示PDF形式でダウンロード (1630K) -
松井 幹彦, 北野 達也, 徐 徳鴻2001 年 121 巻 11 号 p. 1199-1200
発行日: 2001/11/01
公開日: 2008/12/19
ジャーナル フリーThis paper proposes a new simple maximum power point tracking (MPPT) control scheme for a PV system without using conventional “mountain climbing” optimum operating point searching technique. Although no information of voltage and current is needed on PV array side, the generated output power on ac system side can be automatically maximized by utilizing limit cycle phenomena occurring on equilibrium/non-equilibrium boundary of system power flow. After explaining the operating principle of proposed scheme, it is applied to a common “boost chopper/3-phase inverter” interface power converter system. The experimental results show an availability of the new control scheme.抄録全体を表示PDF形式でダウンロード (191K) -
平原 英明, 山本 修, 荒 隆裕2001 年 121 巻 11 号 p. 1201-1202
発行日: 2001/11/01
公開日: 2008/12/19
ジャーナル フリーA linear induction motor has a finite-shaped primary iron core. For this structural reason, the mutual inductance between windings is asymmetrical even if the winding for each phase is itself arranged symmetrically. In this paper, the authors investigate a method to calculate this mutual inductance between windings using the DC decay testing method.抄録全体を表示PDF形式でダウンロード (906K) -
Tetsuzo Sakamoto, Kazuki Yamada, Marc T. Thompson2001 年 121 巻 11 号 p. 1203-1204
発行日: 2001/11/01
公開日: 2008/12/19
ジャーナル フリーThe paper shows a numerical calculation feature and the levitation characteristics of a flux-canceling Maglev with AC excitation, which has an array of conducting coils on the ground and two arrays of onboard magnets. In numerical calculations, the guideway coils are approximated as ladder coils. First the necessary number of guideway coils to be considered in numerical calculations is indicated. Then the calculated results confirm that AC excitation realize a levitation capacity at zero vehicle velocity, and its dependence on the vertical position of the onboard magnets and the excitation frequency.抄録全体を表示PDF形式でダウンロード (190K)
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