Tokyo Metropolitan College of Industrial Technology Repository / 東京都立産業技術高等専門学校リポジトリ
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埋込永久磁石同期モータの高効率制御
Get PDFP(論文)A high efficiency control of interior permanent magnet synchronous motor (IPMSM) is proposed in thispaper. Because of the saliency of IPMSM, the reluctance torque exists in addition to the magnet torque. It is knownfrom the relation between motor torque and armature current phase angle that there is an optimum current phaseangle at which the maximum motor torque is reached for a given armature current amplitude. This means it is acondition of generating torque most effectively for a given armature current. In this paper, a maximum torque perarmature current control strategy is proposed. In the proposed control strategy, the armature current phase isassigned by a look-up table (LUT) in accordance with load conditions. The effectiveness of the proposed control isverified through experiments. Because the LUT can be obtained by experiments offline, a high efficiency drivingcan be achieved in a wide load range without complicated online identification of motor parameters. Furthermore,neither torque meter nor power meter is required in the proposed strategy.departmental bulletin pape
Recent change of physics record II
Get PDFP(論文)As the media report frequently, it is a fear that the academic ability of students is lowering by the effect ofthe government course and a decline in the number of births. It is also a fear how the academic ability of students inour college is. In this paper, I report the recent change of physics record and analyzed this cause and the background.The amount of data is not sufficient and we cannot say definitely, but the physics record might be lowering rapidlyand it might be the effect of the government course.departmental bulletin pape
AN ANALYTICAL METHOD FOR STEADY STATE RESPONSE OF SINGLE-DEGREE-OF-FREEDOM SYSTEM WITH COLLISION
Get PDFP(論文)Collision characteristics are observed in joints and supports of the structures. In analysis of collision characteristics,a bilinear characteristic in which stiffness increases after collision is used. On the other hand, a coefficient of restitution isintroduced. In actual collision phenomena, energy is dissipated and duration of collision is not zero. Energy dissipation ina collision is not considered in the former and duration of collision is assumed to be zero in the latter. In this paper, theforce of restitution is represented as the hysteresis loop characteristic in order to consider energy dissipation in a collisionand duration of collision simultaneously. A quadrilateral hysteresis loop characteristic is used as the hysteresis loopcharacteristic in which the coefficient of restitution is the function of velocity response. A calculation method for thesteady state response of a single-degree-of-freedom system with symmetrical collision characteristic is shown. The forceof restitution is expanded into the Fourier series. In order to improve convergence of the Fourier coefficients, newFourier series are defined. Using the proposed method, a resonance curve is obtained.departmental bulletin pape
A Report on the New Mathematical Achievement Test at Shinagawa Campus of Tokyo Metropolitan College of Industrial Technology I
Get PDFP(論文)In a technical college, mathematics is a very important element of engnieering. In order to have a suitable class inmathematics for technical college student, teachers must know what level of mathematics the first year students have attained.This paper reports the results of the new achievement test which covers the mathematics which the first year students have tounderstand.departmental bulletin pape
The implementation of a velocity feedback controller based on fixed-point arithmetic — The improvement of the control accuracy —
Get PDFP(論文)In the embedded mechatronic systems, the mechanisms are easy to vibrate, since these mechanisms are designedto be light and compact. In such control systems, a velocity feedback controller is often used to damp out these mechanicaloscillations. On the other hand, in the embedded mechatronic control systems, fixed-point microprocessors with shortword length are used for energy, space, and cost saving. This paper considers finite word length (FWL) effects when implementinga discrete-time velocity feedback controller in fixed-point arithmetic. In order to improve the control accuracy,a filter is inserted so that the noise in the velocity signal is filtered out. Though three filters are examined, simulation resultsshow that all these filters are not effective. Since the magnitude of the velocity signal is almost equal to the quantizationstep in fixed-point arithmetic, the velocity signal is disturbed due to arithmetic error in fixed-point arithmetic. Thus, inorder to increase the signal-to-noise ratio, the quantization step is made small. As a result, the arithmetic error is drasticallyreduced and the control accuracy is greatly improved. According above, scaling is a significant factor to realize a velocityfeedback controller based on fixed-point arithmetic.departmental bulletin pape
ETS-VIIIを利用した災害医療支援のための立体画像伝送の研究
Get PDFP(論文)It is pointed out that a lot of people are dead or injured, and the functions of the infrastructure are lost such as the cellular phone, the gas , water service, electricity, and roads, when the communication network system on the ground is broken down by wide-scale disaster. In order to overcome such inconvenient conditions, the construction of Tel-Radiology system not depending on the situations of the ground should be established rapidly. In addition, if 3D image technology is applied for Tel-Radiology, it may lead to the contribution of the triage to the efficiently improved operations in several areas. In this paper, we studied the capability of 3D image technology applying to Tel-Radiology. As a result of sufficient investment of bit stream data transmission of stereo 3D moving pictures employed the ETS-VIII satellite , it is found that the proposed system function well in the experiment assuming a telemedicine."departmental bulletin pape
On Planning of Efficient Proofs without Reductio ad Absurdum by means of Sequents
Get PDFP(論文)Reducio ad absurdum (RAA) is a typical method of proving in mathematics. In aproof by RAA, however, once we put false assumptions, it is hard to distiguish true propositionsfrom other propositions in the following part of the proof. On the other hand, all intermediatepropositions in a direct proof are true and mathematically understandable. Therefore, fromeducational point of view, it is very fruitful to write proofs without RAA. By rewriting theproof by RAA into a direct one, moreover, we sometimes get more general theorem than theoriginal one. In this paper, we introduce a logical system (WNK) which is free from RAA.The proof diagrams of WNK allow plural conclusions as well as plural assumptions, whichmakes the proof diagrams simple. Moreover, we show that proofs of WNK can be plannedefficiently by using `sequents' like in Gentzen's LK.departmental bulletin pape
「都市教養課題研究」実施報告
Get PDFP(論文)本年度から実施した集中講義「都市教養課題研究」では, 東京近郊の宗教施設を四日間で30箇所程度見学した. その実施状況を報告する.departmental bulletin pape