bộ 10 đề amp đáp án tuyển sinh vào lớp 10
Kwang hee nam AC motor control and electrical vehicle applications
... 57 57 59 61 64 67 68 69 73 78 78 78 80 85 85 85 90 93 94 95 96 99 100 101 102 109 109 110 115 117 118 118 119 121 122 122 123 126 vii Permanent Magnet AC Motors 6.1 PMSM ... 257 258 10 Pulse-Width Modulation and Inverter 10. 1 Switching Functions and Six-Step Operation 10. 2 PWM Methods 10. 2.1 Sinusoidal PWM 10. 2.2 ... 10. 2.3 Space Vector PWM Patterns 10. 2.4 Sector-Finding Algorithm 10. 2.5 Overmodulation 10. 2.6 Comparision of Sinusoidal PWM and Space Vector 10. 2.7...
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Design Issues for Enterprise Deployment of Application Servers
... available to them Most enterprise campuses are built today with switched Fast Ethernet (100 Mbps) to each desktop and a backbone of Gigabit Ethernet (100 0 Mbps) Campus networks, per se, are rarely ... network is typically comprised of campus networks, links between campus networks, and a variety of different access networks that connect remote users with one or more campuses Remote users can be traveling ... application server For example, take the case of encryption Encryption can be implemented at the client (in VPN client software), at the branch office router, within a firewall, at the campus/data center...
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design issues for MEMS 1
... dài M 106 μM Lực N 106 μN Thời gian s s Khối lượng Kg Kg Áp suất (ƯS) N/M2 10- 6 μN/μM2 Khối lượng riêng ố Kg/M3 10- 18 Kg/μM3 Điện tích C 101 2 pC Cường độ dòng A 101 2 pA Thế V V Sai số tính toán ... trường thương phẩm Ý nghĩa Đáp ứng nhu cầu đánh giá tiềm thị trường Tác động sản phẩm thiết kế với trình phát triển Xem xét tính cạnh tranh sản phẩm thiết kế để tìm phương án ẩ ế ế ể tối ưu khía ... 4.1.2 Động lực qui trình thiết kế ế ế Khả chế tạo Đánh giá tính cạnh tranh Nhu cầu thị trường Ý tưởng sáng tạo Khả công nghệ Thiết kế sản phẩm Đánh giá hoạt động Mô hình hóa phân tích 4.1 Mở đầu...
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design issues for MEMS 2
... ) iế l i h h (1): X Đáp ứng hệ: X ( s ) = ( sI − A) −1 [x (0) + BU ( s )] Đáp ứng ∈ điều kiện ban đầu (chưa có lối vào) : X zir (s) = (sI − A)−1 x(0) Đáp ứng ∈ tác động lối vào: p g ộ g X zsr ( ... dễ thực hiện, FEM đòi hỏi trình tính toán nhiều lâu ⇒ sai số tính toán FEM nhỏ so với FDM FDM FEM lựa chọn chủ yếu cho toán cấu trúc học FDM ophù hợp cho toán động học chất lưu (computational fluid ... transform) Hàm truyền (transfer function) Biểu diễ toán h ( h ánh xạ tuyến tính biế đổi Laplace) thể hi iể diễn học (phép h ế h biến l ) hể mối quan hệ lối vào lối (phụ thuộc thời gian) dạng hàm tần số:...
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Brushless Permanent Magnet Motor Design- P1 pptx
... trapezoidal motors Topologies Radial flux Axial flux Conclusion vii 96 96 97 97 97 98 99 99 101 103 103 106 107 110 112 113 113 115 117 118 118 118 118 120 121 121 121 122 122 123 Chapter Design Equations ... Measures Motor Size Conclusion 1 10 11 12 Chapter Magnetic Modeling 13 Magnetic Circuit Concepts Basic relationships Magnetic field sources Air gap modeling Slot modeling Example Magnetic Materials Permeability ... I is the length of the block in the z direction The SI unit of H is amperes per meter (A/m), and thus mmf has the unit of amperes (A) Equation (2.4) defines the second fundamental equation of...
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Brushless Permanent Magnet Motor Design- P2 ppt
... case, (3.3), gives d{LI) dl dL e = —:— = L — + / —dt dt dt (3 .10) For constant inductances, the second term on the right-hand side of (3 .10) is zero, giving the standard electric circuit analysis ... are directly opposite each other, is an acceptable approximation to the geometry shown in Fig 2.10a Two expressions for Carter's coefficient are hi = - (2.12) II — + ws ws given by Nasar (1987), ... the circular-arc, straight-line modeling discussed earlier This method is demonstrated in Fig 2 .106 Following an approach similar to that described in (2.11), the permeance of the air gap can...
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Brushless Permanent Magnet Motor Design- P3 potx
... 1961) (5.11) Of these two pitch factors, (5.9) gives the largest reduction in back emf amplitude For example, if acp = 0.75, (5.11) gives kp = 0.92, whereas (5.9) gives kp = 0.75 Thus, if the ... ds = dx + d2 + d1 + d2 = asdwtb (6.9) the conductor slot depth is d3 = ds - asdwtb (6 .10) and the slot cross-sectional area available for conductors is A = R s b — J ~~ W t b (6.11) ... comparison purposes, typical copper residential wiring has a rated peak current density between and 10 MA/m According to Hendershot (1991), this range of current densities is also typical for motor...
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Brushless Permanent Magnet Motor Design- P6 pdf
... utilization is 100 percent • The amount of torque produced can be varied by changing the amplitude of the sinusoidal currents • The phase currents have finite di/dd Based on the three examples considered ... electronics are identical for each phase • Copper utilization is 100 percent • The amount of torque produced can be varied by changing the amplitude of the square wave currents 160 Chapter Seven • ... are out of phase an equal amount with their respective back emf s, the torque will have a reduced amplitude but will remain ripple-free • Each phase contributes an equal amount to the total torque...
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Brushless Permanent Magnet Motor Design- P7 docx
... hp 10- " A/cm2 6.452 -10" 4 A/in 5.066 -10" 10 A/circular mil 1.6387 -10- 6 J/in 1.5532 10 - Btu/in3 1.257 102 gauss-oersted (G-Oe) MG-Oe = 7.958 kJ/m3 0.4535 W/lb 6.083 -10" 4 hp/lb 10 "4 W/cm2 6.452 -10" 4 ... 0.1592 hertz 39.37 in 100 cm cm = 0.3937 in mm = 39.37 mils 1550 in2 104 cm2 10. 764 ft2 1.974 -109 circular mil 6 .102 4 -104 in 106 cm3 35.315 ft3 100 0 grams 2.205 lb 35.27 oz 6.852 -10 "2 slug 185 186 ... (rad/s) Equivalents 10 maxwells or lines 105 kilolines Wb/m2 104 gauss 64.52 kiloline/in2 1.257 gilberts 2.54 -10" 2 ampere/in 1.257 -10" 2 oersted henry = Wb/A 102 il-cm 39.37 ii-in 104 .7 V/k rpm 30/irrpm...
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Brushless Permanent Magnet Motor Design- P4 docx
... resistivity For annealed copper commonly used in motor windings, p(20°C) = 1.7241 x 10~ 8 flm, and ß = 4.3 x 10~ 3 °C - Using (4.26), the slot resistance of a single slot containing ns conductors ... consequent pole design (Hendershot, 1991) reduces the 103 Chapter e O N (a) (b) N Figure 5.1 Rotor design variations S Design Variations 105 number of magnets by one-half but requires the remaining ... surface-mounted PM configuration, Ba is also relatively small Typically, Ba is in the neighborhood of 10 percent of the magnet flux density crossing the air gap The low recoil permeability and long...
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Design and Implementation of a Three-Phase Induction Motor Control Scheme
... This device is specifically suited to motor control techniques such as FO control In BPRA043 [10] , example assembler code used to execute FO control is offered Texas Instruments Technical Document ... Effect Transistor) inverter on the motor controller can amplify these signals to substantial voltage levels It is anticipated that the amplified PWM signals will then induce a torque in the rotor ... (in figure 6.2) ramps to 200rpm for the first 0.5s and then remains at 200rpm for the remaining 1.5s; this can be seen in figure 6.9 The other curve, which resembles an over-dampened second-order...
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Researching Design Learning: Issues and Findings from Two Decades of Research and Development pot
... is – in any case – merely a transitory phenomenon It was significantly different 10 years ago and in another 10 years it may be completely different again But there are things about it that will ... engaged in an authentic design challenge than by someone who has not’ (Garmire & Pearson, 2006, pp 107 – 110) THE IMPORTANCE OF UNCERTAINTY The notion of uncertainty in designing, identified by Garmire ... also provided the example of the possible ‘needs to know’ of a learner designing a bike repair stand, reproduced here in Figure 2-1 and it is interesting to reconsider this example in terms of...
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Báo cáo khoa học: "TENSE GENERATION IN AN INTELLIGENT TUTOR FOR FOREIGN LANGUAGE TEACHING: SOME ISSUES IN THE DESIGN OF THE VERB EXPERT" pot
... design requirements, knowledge bases and reasoning algorithms of the verb expert together with an example which highlights its main capabilities The final section deals with the relevance of the present ... language teaching cians and people interested in computational accounts of language usage (see, for example: Ehrich, 1987; Fuenmayor, 1987; Matthiessen, 1984) There is however no agreement on, and no ... highlight the information relevant for the tense selection process This information includes, for example, the kind of clause (main, coordinate, subordinate), whether the clause has a verb to be solved,...
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stochastic modeling of manufacturing systems advances in design, performance evaluation, and control issues - g. liberopoulos
... Enginarlar et al 38 0.06 g, Tdown = 20 g, Tdown = 100 W, Tdown = 20 W, T = 100 down LN, T = 20 down LN, T = 100 0.05 down f(t) 0.04 0.03 0.02 0.01 0 50 100 150 200 250 300 350 t Fig Different distributions ... , 10} , {[g(p, P ), g(r, R)]i , i = 1, , 10} , (17) {[LN (p, P ), LN (r, R)]i , i = 1, , 10} Systems of the form (13) have been formed as follows: For each machine mi , i = 1, , 10, ... uniform to almost -function Table Downtime distributions considered CVdown Tdown = 20 Tdown = 100 0.1 g(5, 100 ), W (0.048, 12.15), LN (2.99, 0.1) g(0.8, 16), W (0.046, 4.54), LN (2.97, 0.25) g(0.2,...
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essential issues in soc design - designing complex systems-on-chip - y. lin (springer, 2006) ww
... Taiwan A C.I.P Catalogue record for this book is available from the Library of Congress ISBN -10 ISBN-13 ISBN -10 ISBN-13 1-4020-5351-7 (HB) 978-1-4020-5351-1 (HB) 1-4020-5352-5 (e-book) 978-1-4020-5352-8 ... × 24 bits or M × N × bytes If the image is sub-sampled to YUV 4:2:0 format, the size becomes M × N × 1.5 bytes Take a 5-million pixels DSC for example, one raw image size is about 7.5 Mbytes Unlike ... and each module The profiling tools can be, for example, common run time profile tools on workstation and PC, instruction profiling tools, iprof [10] , or Intel® VtuneTM Analyzer, etc It is important...
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Báo cáo hóa học: " Technology-assisted training of arm-hand skills in stroke: concepts on reacquisition of motor control and therapist guidelines for rehabilitation technology design" ppt
... Journal of NeuroEngineering and Rehabilitation 2009, 6:1 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 Fitts PPMI: Human Performance Belmont, CA: Brooks/Cole; ... of feedback are valuable [102 ,104 ,105 ], although there is some evidence that, for skill learning in general [106 ,107 ]and also specifically for persons after stroke [108 ], the use of KP during ... compliance [97 -100 ] Feedback on correct motor performance enhances motivation [80], while feedback on incorrect exercise performance is more effective in facilitating skill improvement [101 ,102 ] Feedback...
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Research Issues in Systems Analysis and Design, Databases and Software Development doc
... customer, the extranet has 10 to 50 end users, content management has to 10, and the other two applications have one to five end users Tools The application portfolio is built in a LAMP environment around ... previous volumes in the Advances in Database Research series, we carefully selected and compiled 10 excellent chapters written by well-known experts in the areas of information systems development ... focusing on the technological components and their applications in organizational memory systems The 10 chapters in this volume provide a snapshot of the latest research in the areas of information...
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