design of permanent magnet synchronous machines

Ngày tải lên: 03/01/2014, 19:50

Ngày tải lên: 03/01/2014, 19:52

... two-pole, permanent- magnet ac machine, which is also called a permanent- magnet synchronous machine, is depicted in Figure 4.2-1 . It has three-phase, wye-connected stator windings and a permanent- magnet ... weakening. Details of current control strategies for surface and buried magnet machines are provided in Chapter 14 . REFERENCES [1] R.H. Park , “ Two-Reaction Theory of Synchronous Machines Generalized ... Electronically Commutated DC Permanent Magnet Machines ,” IEEE Trans. Magn. , Vol. 17 , November 1981 , pp. 3284 – 3286 . [3] T.M. Jahns , “Torque Production in Permanent- Magnet Synchronous Motor Drives...

Ngày tải lên: 16/02/2014, 18:46

... engineering education and of the text Machine Design: An Integrated Approach. He is a Fellow of the Ameri- can Society of Mechanical Engineers and a member of the Society of Automotive Engi- neers. ... Principles of Mechanism in 1841 while a professor of natural philosophy at the University of Cambridge, England. He attempted to systematize the task of mechanism synthesis. He counted five ways of obtaining ... the quality of the design. Commercially available programs such as Working Model* also allow rapid analysis of a proposed mechanical design. The process then becomes one of qualitative design by...

Ngày tải lên: 08/04/2014, 11:35

Ngày tải lên: 05/09/2013, 16:30

... Rotating Machines 200 3.7.1 History and Characteristics of Permanent Magnets 200 3.7.2 Operating Point of a Permanent Magnet Circuit 205 3.7.3 Application of Permanent Magnets in Electrical Machines ... Shift of Damper Bar Slotting from the Symmetry Axis of the Pole 392 7.2.8 V Curve of a Synchronous Machine 394 7.2.9 Excitation Methods of a Synchronous Machine 394 7.2.10 Permanent Magnet Synchronous ... Core Length 171 3.3 Magnetic Voltage of a Tooth and a Salient Pole 173 3.3.1 Magnetic Voltage of a Tooth 173 3.3.2 Magnetic Voltage of a Salient Pole 177 3.4 Magnetic Voltage of Stator and Rotor...

Ngày tải lên: 07/03/2014, 10:20

... 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-...

Ngày tải lên: 08/03/2014, 22:01

... hyperplane. 4. SUPPORT VECTOR MACHINES FOR DICHOTOMOUS WOS FILTERS 4.1. Linear support vector machines for dichotomous WOS filters In the above section, the new approach of designing WOS filter has reduced ... applications. In this paper, SVMs are introduced into the design of WOS filters in ordertoimproveperformance. WOS filters are special subset of stack filters. Each stack filter is based on a positive ... marginally im- proved by using the conventional design approach of stack filter or neural network. Although the adaptive neural fil- ter can effectively remove noise of various kinds, including Gaussian noise...

Ngày tải lên: 22/06/2014, 23:20

... 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...

Ngày tải lên: 02/07/2014, 08:20

... 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 -H c 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...

Ngày tải lên: 02/07/2014, 08:20

... 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/m 2 N ph Number of phases N m Number of magnet poles N sp Number of slots per phase, N sp ^ N m 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,...

Ngày tải lên: 02/07/2014, 08:20

... 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...

Ngày tải lên: 02/07/2014, 08:20

... Number of turns N m Number of magnet poles N p Number of pole pairs N ph Number of phases N s Number of slots N Number of slots per magnet pole N sp 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...

Ngày tải lên: 02/07/2014, 08:20

... distribution of the shoe depth between d\ and d 2 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 N m is even, and the number of north-south pole pairs on the rotor is N p ... 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.,...

Ngày tải lên: 02/07/2014, 08:20

... identification of the current harmonic model of synchronous machine and observation of modulation error. In this approach, considering the equations of synchronous machine, a model consisting of input ... capabilities of designing the torque characteristics to meet the requirements of the driven load, have made them the optimal choices for a multitude of industries. Economical utilization of these machines ... considered in modelling of these machines, namely space harmonics of the flux linkage distribution are neglected, linear magnetic due to operation in linear portion of magnetization curve prior...

Ngày tải lên: 27/07/2014, 23:28

... the quality of the design. Commercially available programs such as Working Model* also allow rapid analysis of a proposed mechanical design. The process then becomes one of qualitative design by ... motor. There are a myriad of other examples of fourbar coupler curves used in machines and mechanisms of all kinds. One other example of a very different application is that of the automobile suspen- sion ... of the linkage assembly, and its motion is along a set of coupler curves. The orientation of the wheel is also of concern in this case, so this is not strictly a path generation problem. By designing...

Ngày tải lên: 08/08/2014, 12:23

... orientation of the link which contains the point of interest. The coupler curve is made to pass through a set of desired output points. However, it is common for the timing of the arrival of the coupler ... rotation of the input rocker, link 2, through an as yet unspecified angle ~z. Note also that the angle of the coupler link 3 at each of the precision positions is defined by the angles of the position ... the coordinates of vectors W, Z, D, and S, which define not only the lengths of those links but also the locations of the fixed pivots Oz and 04 in the plane and the lengths oflinks 3 and 1....

Ngày tải lên: 08/08/2014, 13:20

... moving centrode at one extreme of its path motion (i.e., at one of the positions ofh,3), then it will have a cusp in its coupler curve. Figure 6-17b shows a coupler curve of such a point, drawn with program ... linkage. All of the coupler curves of points on link 3 will have the same path shapes as in the orig- inallinkage. We now have, in effect, a "linkless" fourbar linkage, really one composed of ... example shown in Figure 6-14 is a non-Grashof fourbar. The lengths of its centrodes are limited by the double-rocker toggle positions. All instant centers of a linkage will have centrodes. If the...

Ngày tải lên: 08/08/2014, 13:20

Ngày tải lên: 08/08/2014, 13:20

Ngày tải lên: 08/08/2014, 13:20