1Jan

B H Curve Experiment Pdf

1 Jan 2000admin
B H Curve Experiment Pdf Rating: 5,0/5 8229 votes

% Use linear representation to find value of H corresponding to BsatbeginHsatbegin = Bsatbegin/(mu0.mur);% Rearrange nonlinear representation to calculate coefficient, aa = atanh( Bsatbegin/Bsat )/Hsatbegin;% Nonlinear representationHnonlinear = -750:25:750;Bnonlinear = Bsat.tanh(a.Hnonlinear);Use Parameters in Simscape ModelThe parameters calculated can now be used in a Simscape model. Once simulated, the model is set to output a Simscape logging variable, simlogeecustomtransformer, and some signals using output ports, yout.

Home → Magnetisation (B-H) Curves Consider a toroidal solenoid wound on a non-magnetic core, such as shown in Fig. If the flux density is measured on the centre line of the toroid, the relationship between B and H is given. B-y the straight line OA in Fig.

Circuit parameters are.Defined characteristic: calculated from fundamental parameters.Characteristic from logging: calculated from internal Simscape logging data.Characteristic from measurement: obtained by measurement and calculation using electronic test circuitDue to leakage and parasitic parameters, the characteristic obtained from the electronic test circuit differs to the defined characteristic. However, the test circuit and its parameterization is shown to find the characteristic for the given transformer within suitable tolerances. If exist( 'h1eecustomtransformer', 'var').isgraphics(h1eecustomtransformer, 'figure')h1eecustomtransformer = figure( 'Name', 'eecustomtransformer');endfigure(h1eecustomtransformer)clf(h1eecustomtransformer)plot(.Hnonlinear.Bnonlinear. 'LineWidth',2);grid( 'on' );title( 'Transformer B-H Curve' );xlabel( 'Magnetic Field Strength, H (A/m)' );ylabel( 'Magnetic Flux Density, B (T)' );legend( 'Calculated', 'Simulated'. 'From Sensor', 'Location', 'NorthWest' ).

This example shows calculation and confirmation of a nonlinear transformer core magnetization characteristic. Starting with fundamental parameter values, the core characteristic is derived. This is then used in a Simscape™ model of an example test circuit which can be used to plot the core magnetization characteristic on an oscilloscope. Model outputs are then compared to the known values.

Open Model

Specification of Parameters

Fundamental parameter values used as the basis for subsequent calculations:

  • Permeability of free space,

  • Relative permeability of core,

  • Number of primary turns,

  • Number of secondary turns,

  • Effective magnetic core length,

  • Effective magnetic core cross-sectional area,

  • Core saturation begins,

  • Core fully saturated,

Calculate Magnetic Flux Density Versus Magnetic Field Strength Characteristic

Where:

  • Magnetic flux density,

  • Magnetic field strength,

Linear representation:

Nonlinear representation (including coefficient, a):

Use Parameters in Simscape Model

The parameters calculated can now be used in a Simscape model. Once simulated, the model is set to output a Simscape logging variable, simlog_ee_custom_transformer, and some signals using output ports, yout. Circuit parameters are:

  • Voltage source magnitude,

  • Voltage source frequency,

  • Voltage source resistance,

  • Operational amplifier input resistance,

  • Operational amplifier feedback resistance,

  • Operational amplifier feedback capacitance,

Calculations on Logging and Output Data

The data needs to be processed to provide the Magnetic field strength and Magnetic flux density data for comparison. Where:

  • Magnetomotive force,

  • Magnetic flux,

  • Operational amplifier input voltage,

  • Operational amplifier output voltage,

    Plug ins effects tdm 4. TDM plug-ins are often compared with another Pro Tools plug-in format, RTAS. The main difference is that TDM plug-ins derive their processing power from hardware DSP cards installed in the computer. In contrast, RTAS plug-ins utilize resources from the host computer.

Equations to be used are as follows:

Conclusion

The three characteristics can now be overlaid:

  • Defined characteristic: calculated from fundamental parameters

  • Characteristic from logging: calculated from internal Simscape logging data

  • Characteristic from measurement: obtained by measurement and calculation using electronic test circuit

Due to leakage and parasitic parameters, the characteristic obtained from the electronic test circuit differs to the defined characteristic. However, the test circuit and its parameterization is shown to find the characteristic for the given transformer within suitable tolerances.