I want to do it in matlab or labview without using built in functions or tool boxes. Experiments for first year electrical engg lab 201415 dept of electrical engineering, shri ramdeobaba college of engineering and management, nagpur 4400 india page 8 on lhs by hand with pencil experiment no. The normal magnetization curve as the locus of the tip for each hysteresis loop. One specimen of transformer stamping and another sample of ferrite ring is also supplied. Bh curve experiment manual pdf laboratory manual v and inverted v curves of a 3phase synchronous motor. Determination of bh curve of core material of transformer.
Seems like the bhcurve is included in the model through the material library, provided you also have the acdc module. Vary the material parameters and observe the characteristics of the material. If the student repeats the experiment in the regular lab session due to unsatisfactory results then the maximum marks is 8. Keep in mind that permeability is a function of h, it is not constant for all values of h. Further the flux linked with the pickup coil of area a c due to sample of area a s will be. Starting with fundamental parameter values, the parameters for linear and nonlinear representations are derived. If the student fails to attend the lab, heshe will be allowed to conduct the experiment however no help is provided and the maximum marks will be 5. Magnetic permeability and the bh curve, electrical. Electrical engineering assignment help, magnetic permeability and the bh curve, magnetic permeability and the bh curve to measure the relationship between field strength h and flux density b for a material, a sample is made into a closed ring and a magnetising. If we plot other bh curves with the same value of the current, but for different lower frequencies, we would obtain almost same progress as shown in fig.
Comparison between simulated results by formula proposed by chan and experimental results of bh curve. Thus, in terms of laboratory quantities we have the equivalent definition of rh in terms of the hall voltage and the current. Bh curve unit instrument it consists of electronic circuity housed in a cabinet. Maximum power is delivered to the load resistance from the network when its resistance. Cotton observation weight % 1 2 3 4 5 total average 15 7 7 15 11 9 49 9. The corresponding magnetic induction b is obtained through integration of the voltage v induced in second coil as. In case a magnetic component is saturated in the condition you want to use it, it is difficult to expect inherent performance of it. Assume 10% nonlinearity from the region of the bh curve we actually use, and the magnetising current is 10% of. A closer look at the hysteresis loop for ferromagnets. By the way, if you do a series of measurements of i c versus v ce all with the same i b and you plot the results on the above graph, then you will get a horizontal straight line. A plot of bh where both b and h vary between a positive. Page 11 using the s curve 215 for mains and monitors in this example, the s curve 215 is used for both the main pa speakers running a mono mix, and for the monitor mix, also in mono. Pdf in this paper, an adequate bh curve extrapolation method is proposed. To study bh curve and to find out the values of coercivity, retentivity and saturation magnetisation of experimental material.
The hysteresis loop, describing the relation between h and b, is called the magnetization curve. The plot of magnetization m or magnetic field b as a function of magnetic field intensity h i. Measuring the hysteresis loop of the toroidal core using. Chapter 2 magnetic materials and their characteristics. The initial permeability was the gradient of the beginning part of initial magnetization curve, shown on fig. Plotting bh curves in 2 operational amplifier electricity free. Bh analyzer is the only instrument that can perform high accuracy bh curve measurement of soft magnetic materials under various conditions in a wide range. Bh curve a bh curve plots changes in a magnetic circuits flux density to magnetic field strength, as the magnetic field strength is gradually increased or decreased. Determination of bh curve of core material of transformer 1 aim 2.
The apparatus consists of electronic training board new tech type nti 226. Starting with fundamental parameter values, the core characteristic is derived. Then, the s curve 215s channel 1 and channel 2 outputs are connected to the inputs of the active selfpowered loudspeakers. The relationship between the bh curve and the jh curve is shown in figure 4. Electrical engineering stack exchange is a question and answer site for electronics and electrical engineering professionals, students, and enthusiasts. Physics stack exchange is a question and answer site for active researchers, academics and students of physics. Then the bh curve follows the path of abcdefa as the magnetizing current flowing through the coil alternates between a positive. How to plotcalculate bh curve from input current and. I guess the model itself is also a part of the module, meaning you do have the module.
At this point, it is not necessary to make further analysis of achieved bh curves. The curve types includes smooth curve, straight curve, smooth scribble, straight scribble, smooth freeform, straight freeform, drawing signature pencil tool and cloud tool. By varying this parameter, the jh loop, djdt and d2jdt2 loop will be produced. The remote trigger equipment allows you to control the applied magnetic field h. The difference in shape is due to the onset of saturation. Bh curve article about bh curve by the free dictionary. The resulting shape indicates how the flux density increases or decreases due to the gradual alignment of the magnetic domains atoms, that behave like tiny magnets within. So, you can go to the model physics settings subdomain and find the material parameters, go browse the library and press plot at the. The model also compares the results from the effective hbbh curve model with the linear and nonlinear hbbh curve material model in 2d. Bh curve is used to show the relationship between magnetic. Pdf extrapolating bh curve data using common electrical.
The experiment that you have performed in the lab, same has to be discussed with your friends after finishing your lab. D, permeability 21 h the relationship between b and h is not linear, as shown in the hysteresis loop in figure 21. By observing hysteresis loop on cro, retentivity, coercivity, and energy. We know that the magnetic flux generated by an electromagnetic coil is the amount of magnetic field or lines of force produced within a given area and that it is. The signal corresponding to the applied field, h a, can be written as e1 c 1ha 3 where c 1 is a constant. Numerical methods lecture 5 curve fitting techniques. An alternating current, instantaneous value and rootmeansquare current and volt. Read the experiment at least once or twice before coming to the practical class the experiment which you have to perform. Determination of bh curve of core material of transformer 1 aim to determine of bh curve of core material of transformer 2 theory the rms voltage induced in a transformer is given by e 4. You are asked to bring the necessary stationeries pen, pencil, calculator, eraser etc. Screnshot of bh curve for the test toroid under higher mmf. I recognize that there may be no easy way to express the entire curve in a single equation, but clearly people are generating these plots, and i think they.
Experiments for first year electrical engg lab 201415. Experiment magnetic circuit all the contents is not 100% legit slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. Experiment 323 the initial magnetization curve and the hys teresis. The bh curve is the extrinsic demagnetization curve. Pdf extrapolating bh curve data using common electrical steel. See example pdf and example pdfill project file you can use this tool to draw a curve into a pdf document. The jh curve is the intrinsic demagnetization curve. The magnetic saturation can be determined by measuring the bh curve.
Magnetic saturation will be one of very important parameters to evaluate magnetic materials. Click plot and the mh curve is displayed on the screen. You can edit each curve point and openclose the curve. Then, it is evident that the ratio, bh, permeability, also varies. There are an infinite number of generic forms we could choose from for almost any shape we want.
The intersection of pc line and the bh curve defines the normal operating point a. So, you just bought a shiny, new, and maybe expensive, lens for your camera, and being the savvy consumer, you did your homework. This example shows a comparison in behavior of a linear and nonlinear inductor. This experimentchapter is prepared by makarand m kane research scholar, 2015 batch.
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