design of permanent magnet synchronous generator
Tài liệu Báo cáo khoa học: "DESIGN OF A KNOWLEDGE-BASED REPORT GENERATOR" doc
... subor- dinate clauses as the opening form of two consecutive sentences. 148 DESIGN OF A KNOWLEDGE-BASED REPORT GENERATOR Karen Kukich University of Pittsburgh Bell Telephone Laboratories ... cost of semantic and linguistic flexibility. However, the loss of flexibility appears to be not much greater than the con- straints imposed by the grammar and semantics of the sublanguage of ... in terms of a theory of stratified natural language processing in which macro- level knowledge constructs, such as those used in a knowledge-based report generator, occur at one of the higher...
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Expansion of Operating Limits for Permanent Magnet Motor by Current Vector Control
... values of the demagnetizing coefficient are about 0.8. In some cases, the permanent magnet is demagnetized irreversibly by the flux-weakening control. VI. DEMAGNETIZATION OF PERMANENT MAGNET ... leakage permeance of ar- mature, MORIMOTO et al.: EXPANSION OF OPERATING LIMITS FOR PERMANENT MAGNET MOTOR 867 To examine the demagnetization of the permanent magnet due to the ... rare-earth permanent magnet where the sign of magnetic field intensity H is reversed. With the permanent magnet that has a straight demagnetization curve, such as a rare-earth permanent mag-...
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Brushless Permanent Magnet Motor Design- P1 pptx
... covers the analysis and design of rotational brushless per-manent -magnet (PM) motors. Brushless dc, PM synchronous, and PM step motors are all brushless permanent- magnet motors. These specific ... The optimum number of magnet poles is a complex function of motor geometry and material properties. Thus in many designs, economics dictates that a small number of magnet poles be used. ... that op-posite magnet poles attract, that like magnet poles repel each other, and that current flowing in a coil of wire makes an electromagnet. Consider the bar permanent magnet centered...
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Brushless Permanent Magnet Motor Design- P2 ppt
... gaps, and slotted magnetic structures were developed. The properties of ferromagnetic and per-manent -magnet materials were discussed. A magnetic circuit model of a permanent magnet was introduced ... drop off more quickly as -Hc is ap-proached. Operation in the area of the knee can cause the magnet to lose some magnetization irreversibly because the magnet will recoil along a line of ... proportional to the size of the hysteresis loop of a given material, and therefore by inspection of Fig. Figure 2.15 Typical core loss characteristics of ferromagnetic material. Magnetic Modeling...
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Brushless Permanent Magnet Motor Design- P3 potx
... motor magnetic design. In the process of doing so, many additional design tradeoffs become apparent. Thus the design equations presented here add yet another layer of understanding of brushless ... current density, A/m2 Nph Number of phases Nm Number of magnet poles Nsp Number of slots per phase, Nsp ^ Nm g Air gap length, m lm Magnet length, m Rso Outside stator ... skew factor computations. Chapter 6 Design Equations The preceding chapters provide a wealth of information regarding the design of many aspects of brushless PM motors. In this chapter,...
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Brushless Permanent Magnet Motor Design- P6 pdf
... 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 ... illustrate many of the design tradeoffs inherent in motor design. There is no end to the exceptions and variations that could be considered. Many companies have computer-based design programs ... difficult. Simply making the magnet arc narrower works, which results in the use of less magnet material. To ease the explanation of the A connection, the rising edges of the back emfs and...
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Brushless Permanent Magnet Motor Design- P7 docx
... Number of turns Nm Number of magnet poles Np Number of pole pairs Nph Number of phases Ns Number of slots N Number of slots per magnet pole Nsp Number of slots ... 141-147. Hendershot, J. R. (1991), Design of Brushless Permanent Magnet Motors, Magna Physics Corp., Hillboro, OH. This text is more of a survey of motor design, material properties, and ... This set of notes is used by the authors in day long short courses. The basics of magnetic circuit modeling are covered. A very good discussion of permanent magnets and magnetizing...
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Brushless Permanent Magnet Motor Design- P4 docx
... distribution of the shoe depth between d\ and d2 is not critical, but an optimum design can be determined with the aid of finite element anal-ysis. Slotted Stator Design When a slotted stator design ... topologically. The rotor has an even number of magnets. That is, the number of magnet poles facing the air gap Nm is even, and the number of north-south pole pairs on the rotor is Np ... General stator design allows more flexibility. The primary constraint on stator design is that the total number of stator slots be some even integer multiple of the number of phases, i.e.,...
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SAP2000® Linear and Nonlinear Static and Dynamic Analysis and Design of Three-Dimensional Structures
... 1 - 2 Overview of the Program 1 Overview of the Program SAP2000 is a stand-alone finite-element-based structural program for the analysis and design of civil structures. It offers an intuitive, ... Property Type for Add area of the form. Scroll down the list of import options until you find Import Double Angle – see Figure 7. Single click on it. D. In the Click to area of the Frame Properties ... to read this manual on your computer screen. During the course of this tutorial, we will explore many of the basic fea-tures of SAP2000. Prepare to spend at least one hour going through this...
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SAP2000 Integrated Finite Elements Analysis and Design of Structures
... Select Mode.24. Click the roof beam at the top of the braced frame to select it. Also click the joint at the top of the chevron brace (center of braced frame roof beam) to select it.25. From ... C-10 to enter the last roof beam.The model now appears as shown in Figure C-11.Figure C-11: Model After All Roof Level Beams Have Been Drawn18. Select all of the roof level frame elements and ... Span Loads Used In SAP2000 ModelRoof Beams 39, 40, 51, 520.40 klf DL0.12 klf LLRoof Beams 41/44, 42, 47/50, 49Roof Beams 45, 460.48 klf DL0.24 klf LLRoof Beams 43, 48Second Floor Beams...
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The design of mat foundations
... being designed for a small office building with a total live load of 250 kips and dead load of 500 kips. Find: (a) the depth Dffor a fully compensated foundation, (b) the depth Dfif a soft ... of the clay layer, z/B = 18 ft / 40 ft = 0.45 and L/B = 60 ft / 40 ft = 1.502) At the middle of the clay layer, z / B = 22 ft / 40 ft = 0.55 and L/B = 60 ft / 40 ft = 1.503) At the bottom of ... 0.25eo = 0.9density (sat) = 119 pcf Example 4. Design the steel lying in the East-West direction of the mat shown below with external dimensions of 42 feet by 74 feet. The columns are all 15”by...
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