field oriented controls of induction motors

... Field- Oriented Controls of Induction Motors 5.1 Direct versus Indirect Vector Controls 5.2 Rotor Field- Orientated Scheme 5.2.1 Field- Oriented Control Implementation 5.3 Stator Field- Oriented ... 14 15 17 23 24 25 26 Rotating Field Theory 2.1 Construction of Rotating Field 2.1.1 MMF Harmonics of Distributed Windings 2.1.2 Rotating MMF Sum of Three-Phase System 2.1.3 ... classical theories regarding induction motors are reviewed From Chapter to Chapter 6, dynamic modeling, field -oriented control, and some advanced control techniques for induction motors are illustrated...

Ngày tải lên: 24/07/2015, 13:53

... Two common types of non-repudiation evidence are the evidence of proof of creation of a message and evidence of proof of receipt Non-repudiation often involves the participation of a trusted third ... carried the traffic of hundreds or thousands of users Today's Internet-connected user considers a dedicated, dial-up 28.8-Kbps line a pauper's connection Of course, the profiles of a typical user ... portion of the total available bandwidth of the link Because of the volume of traffic that is typical between two campuses, the enterprise normally negotiates for a particular guaranteed quality of...

Ngày tải lên: 24/10/2013, 07:20

Ngày tải lên: 21/02/2014, 13:20

... LINH KIỆN VÀ XÂY DỰNG QUY TRÌNH CHẾ TẠO/ MEMS DESIGN V VI CHẾ TẠO VÀ PHÂN LOẠI CÔNG NGHỆ MEMS/ MICROFABRICATION AND MEMS TECHNOLOGY VI CÁC LINH KIỆN MEMS ĐIỂN HÌNH/ TYPICAL MEMS DEVICES IV Thiết ... V Sai số tính toán gồm giới hạn xác dãy số kết (truncation error) giới hạn xác phép tính (round-off error) giải phương trình 4.2 Các hệ thu nhỏ kích thước 4.2.3 Các hiệu ứng vật lý đặc biệt Tạp...

Ngày tải lên: 23/04/2014, 10:18

... Mắc song song (paralell): áp dụng cho trường hợp chia sẻ biến tác động (effort) Định luật Kirschhoff ∑I =0 Áp dụng với mạch kín: ∑ V = Áp dụng cho dòng nút i: i i -F + ek + em + eb = 4.3 Mô hình ... quang khắc (photolithography) Các chi tiết linh kiện MEMS định dạng, tạo ảnh ăn mòn bóc lớp (lift-off) qui trình quang khắc Giới hạn quang khắc khả tạo kích thước nhỏ cho linh kiện ⇔ kích thước...

Ngày tải lên: 23/04/2014, 10:18

... thought of as the amount of magnetic field flowing through a given area of material, and the field intensity H is the resulting change in the intensity of the magnetic field due to the interaction of ... the inclusion of this material would dilute the primary focus of this book, which is to understand the intricacies and tradeoffs in the magnetic design of brushless permanent-magnet motors I hope ... radial flux motors Motors having a pancake shape are shown in Fig 1.2c and d In these motors the magnetic field between the rotor and stator travels in the axial direction Thus these motors are...

Ngày tải lên: 02/07/2014, 08:20

... function of the past history of the field intensity Because of this behavior, the magnetic properties of ferromagnetic materials are often described graphically in terms of their B-H curve, hysteresis ... function of the field intensity, the multivalued nature of the permeability means that the flux density through the material is not unique for a given field intensity but rather is a function of the ... the base of the teeth is greater Figure 2.11 A comparison of various carter coefficients 24 Chapter T Base of Tooth Flux Figure 2.12 Flux squeezing at the base of a tooth by a factor of (1 —...

Ngày tải lên: 02/07/2014, 08:20

... Trapezoidal Motors In practice there are two common forms of brushless PM motors: motors having a sinusoidal back emf, which are commonly referred to as ac synchronous motors, and trapezoidal back emf motors, ... wealth of information regarding the design of many aspects of brushless PM motors In this chapter, this information is brought together to illustrate motor magnetic design In the process of doing ... as there are motors themselves Given the body of information provided in this chapter and Chap 4, it is possible to develop equations for the design of brushless permanent-magnet motors Chapter...

Ngày tải lên: 02/07/2014, 08:20

... simple elegance of (7.3) and (7.8) is due to the pure sinusoidal content of the back emf and phase currents Because of this elegance, a great deal of work goes into the design of some motors to minimize ... historical dominance of three-phase induction and synchronous motors and the minimal number of power electronic devices required are likely contributing factors The addition of a third phase provides ... current For two-phase motors, two H bridges are required, giving a total of eight switches to be implemented by power electronic devices Three-Phase Motors Three-phase motors overwhelmingly dominate...

Ngày tải lên: 02/07/2014, 08:20

... inductance (H) Number of turns Number of magnet poles Number of pole pairs Number of phases Number of slots Number of slots per magnet pole Number of slots per phase Nsp N Number of slots per pole ... published in 1929 It offers an amazing collection of analytically derived field distributions force equations applicable to electrical machines Hanselman, D C (1993), "AC Resistance of Motor Windings ... Control of Electrical Drives, Springer-Verlag, New York A classic text on the control of all common motor types Li Touzhu, and G Slemon (1988), "Reduction of Cogging Torque in Permanent Magnet Motors, "...

Ngày tải lên: 02/07/2014, 08:20

... There are an infinite number of variations resulting from an infinite number of assumptions and performance tradeoffs Many of these variations are the result of years of engineering effort and insight ... the base of the stator teeth Both of these decrease the performance of the motor Thus a performance tradeoff is identified Armature Reaction Armature reaction refers to the magnetic field produced ... interaction with the PMfield An illustration of the armature reaction field is shown in Fig 4.16 Ideally, the magnetic field distribution within the motor is the linear superposition of the PM and winding...

Ngày tải lên: 02/07/2014, 08:20

... Chapter – The Software Design……………………………… 7.1 A basic overview of how the software is organized…………………………………………… 7.2 43 43 The Main Program – The Field- Orientated Control Portion of the Software Design…………………… ... Wildi also presents the two types of induction motors: “the squirrel cage induction motor” and the “wound motor” An explanation of the advantages and disadvantages of each is given Essential concepts ... revolution Based on this, the software section of the design must interrupt the speed of the rotor based on the number of pulses it receives The rated speed of the induction motor used in this...

Ngày tải lên: 27/10/2013, 23:15

Ngày tải lên: 23/03/2014, 23:20

... part of the revision of 16+ examinations Prior to this point, there had been a twin system of qualifications at 16+; the General Certificate of Education (GCE), for the ‘top’ 25% of ability of ... General Certificate of Secondary Education Awarding Bodies One of the immediate outcomes of this project was the development by one of these awarding bodies of a new form of syllabus and examination ... without the whole-hearted professionalism of all the members of the research teams that we assembled for the projects Some individuals have been at the heart of many of our projects, and none more...

Ngày tải lên: 24/03/2014, 02:20

... research carried out in the fields of linguistics and philosophy, concerning theories of verb generation and the temporal meaning of verbs, respectively, and the field of intelligent tutoring systems ... follows, in order to better understand the discussion of the Domain Expert, a sketchy account of the system mode of operation is given The problem of choosing the right verb tense in order to convey ... in order to compute some of the tense features not explicitly present in the schematic description of the exercise The first task of the expert module is therefore that of deriving possible new...

Ngày tải lên: 01/04/2014, 00:20

... due to the inuence of Professor Horst Rittel, my professor at the University of California at Berkeley during my formative undergraduate days, who instilled much of the basis of this philosophy ... level of buffering as a function of machine efciency, line efciency, the number of machines in the system, and CVup and CVdown is introduced It leads to a reduction of lean buffering by a factor of ... the operation of the production line dened by assumptions (i)(vi) of Section Then, a set of representative distributions of up- and downtime was selected and, nally, for each member of this set,...

Ngày tải lên: 08/04/2014, 12:26

... Number -of- CBh ( CurBlock-level loop in the horizontal direction) …… … end of Number -of- CBh end of Number -of- CBv end of Number -of- SRh end of Number -of- SRv end of Number -of- MB h end of Number -of- MB ... understand the complexity of the system 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® ... consists of off-chip memory, on-chip memory, and registers [12], as shown in Figure Different memory types have different features Off-chip memory, usually DRAM, offers a large amount of storage...

Ngày tải lên: 05/05/2014, 13:35

... Schematic presentation of types of augmented feedback sources for motor performance Schematic presentation of types of augmented feedback sources for motor performance back or knowledge of results) They ... with learning of target movements [116,117] Also the finding that subjective performance evaluation or estimation of specific characteristics of some of the movement-related components of a performed ... 3-degree of freedom robot, comprising of an easy to transport aluminum frame and motor controlled nylon wires The end of each wire is Page of 18 (page number not for citation purposes) Journal of NeuroEngineering...

Ngày tải lên: 19/06/2014, 08:20

... purposes only Inclusion of the names of the products or companies does not indicate a claim of ownership by IGI Global of the trademark or registered trademark Library of Congress Cataloging-in-Publication ... applications and software from practitioners This volume, Research Issues in Systems Analysis and Design, Databases and Software Development, is a collection of state -of- the-art research -oriented chapters ... increased quality of work by emphasizing the use of professional work practices and ethical software development The waterfall model emerged as a systematic, sequential solution to software development...

Ngày tải lên: 27/06/2014, 06:20