The operating characteristics of the sensorless vector-controlled induction motors are generally affected by motor parameters. Starting from the basic concept, the paper presents the practical self-commissioning techniques of electrical motor parameters of sensorless vector-controlled induction motors. By using the proposed method, the control accuracy is improved up to ±0.5% in peed and ±5% in torque, respectively.

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As speed control method of Two-Inertia system, conventional PID control is used well. However, when a gear or a coupling backlash exists in the 2-I system, the conventional PID control may not be able to suppress vibration caused by the backlash. To solve above problem, this paper deduces a sufficient condition of Multi-inertia system stability with PID control. Therefore, if the parameters of the PID controller are designed to meet the sufficient condition of control system stability, stable speed control without backlash vibration can be produced without relation to the presence of the backlash. The parameters of the PID controller can be designed by Coefficient Diagram Method (CDM). The effectiveness of the proposed speed control method will be shown by both simulations and experiments.

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ウミホタル生物発光に関連したイミダゾピラジノン誘導体は活性酸素検出などに重要な化学発光基質である。我々はイミダゾピラジノン化学発光の高性能化を目指し、その反応機構や化学修飾について検討している。今回は、π共役置換基として働くフェニル基に注目した。イミダゾピラジノン環の5,6,8位にフェニル基を系統的に導入し、導入位置と置換数が化学発光特性に及ぼす効果について調べた結果を報告する。

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本講演では、弱測定理論を用いることにより2 qubit系の量子状態推定にかかる測定のセットを減らすことが出来ることを示す。また、その状態推定に対する効率に関して時間の範囲内で議論する。

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In this paper, we propose a control algorithm for current-type converter with LC filter placed on the ac side. To improve the sinusoidal waveform of ac input current, we introduce an approach based on sliding mode. It is shown that the PWM pattern is gotten as a natural result of the control process, robust property to parameter variation can be introduced into the control algorithm easily. Because all of the control processes is completed in software and the switching signals are accessed directly within the control strategy, hardware of control circuits can be simplified. To confirm the validity of proposed control algorithm an experimental investigation is also made. The result of experiment verified the properties of tracking to reference, source power factor appointablity and suppressing effect on LC filter resonant oscillation.

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