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+{
+"cells": [
+ {
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "# Chapter 2: Magnetic Current"
+ ]
+ },
+{
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "## Example 2.10: exciting_current.sce"
+ ]
+ },
+ {
+"cell_type": "code",
+ "execution_count": null,
+ "metadata": {
+ "collapsed": true
+ },
+ "outputs": [],
+"source": [
+"\n",
+"//calculate the total amprers turns\n",
+"u=1//for air gap\n",
+"F=1.2e-3//flux\n",
+"A=10e-4 //area \n",
+"B=F/A\n",
+"H=B/(4*3.14*10^-7*u)\n",
+"l=0.2e-3//air gap\n",
+"S=H*l//amps turns in air gap\n",
+"l1=15e-2//air gap\n",
+"A1=8e-4\n",
+"H1=450\n",
+"S1=H1*l1\n",
+"F1=0.6e-3\n",
+"B1=F1/A1\n",
+"H2=140\n",
+"S2=H2*30e-2\n",
+"TN=500\n",
+"TAN=S+S1+S2\n",
+"EI=TAN/TN\n",
+"disp('exciting current =' +string(EI)+'amps' )"
+ ]
+ }
+,
+{
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "## Example 2.11: hysteris_loop.sce"
+ ]
+ },
+ {
+"cell_type": "code",
+ "execution_count": null,
+ "metadata": {
+ "collapsed": true
+ },
+ "outputs": [],
+"source": [
+"\n",
+"//calculate the hysteris loss\n",
+"A=50//area of hysterisis\n",
+"H=200\n",
+"B=0.2\n",
+"f=50\n",
+"D=10// density\n",
+"M=1000// mass\n",
+"V=M/D// velocity is mass /density\n",
+"HL=A*H*B//.....j/m^2/cycle\n",
+"HL1=A*H*B*10^-4//....j/cycle\n",
+"HL2=A*H*B*50*1e-4//....j/s\n",
+"\n",
+"disp('Hysteresis loop = '+string(HL2)+' j/s')"
+ ]
+ }
+,
+{
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "## Example 2.1: flux_density.sce"
+ ]
+ },
+ {
+"cell_type": "code",
+ "execution_count": null,
+ "metadata": {
+ "collapsed": true
+ },
+ "outputs": [],
+"source": [
+"\n",
+"//determine the fukux density\n",
+"F=0.5e-3;//webers\n",
+"A=4*10^-4;//meter^2\n",
+"B=F/A;\n",
+"disp('flux density is = '+string(B)+' Wb/m^2');"
+ ]
+ }
+,
+{
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "## Example 2.2: Magnetic_field_strength.sce"
+ ]
+ },
+ {
+"cell_type": "code",
+ "execution_count": null,
+ "metadata": {
+ "collapsed": true
+ },
+ "outputs": [],
+"source": [
+"\n",
+"//determine the magnetic field strenght at the centre of solinoid\n",
+"I=2;//amp\n",
+"L=50e-2;//meter\n",
+"N=100;//turns\n",
+"H=(N*I)/L;\n",
+"disp('magnetic field strenght='+string(H)+'AT/m');"
+ ]
+ }
+,
+{
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "## Example 2.3: reluctance_current_and.sce"
+ ]
+ },
+ {
+"cell_type": "code",
+ "execution_count": null,
+ "metadata": {
+ "collapsed": true
+ },
+ "outputs": [],
+"source": [
+"\n",
+"//calculate the reluctance and current\n",
+"A=5e-4\n",
+"N=250\n",
+"l=50e-2\n",
+"F=700e-6\n",
+"u=380\n",
+"S=l/(4*%pi*10^-7*A*u)\n",
+"I=F*S/N\n",
+"disp('current='+string(I)+'amps' , 'reluctance ='+string(S)+'AT/Wb')"
+ ]
+ }
+,
+{
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "## Example 2.4: relative_permeability.sce"
+ ]
+ },
+ {
+"cell_type": "code",
+ "execution_count": null,
+ "metadata": {
+ "collapsed": true
+ },
+ "outputs": [],
+"source": [
+"\n",
+"//determine the value of relative permeability of iron\n",
+"D=15e-2\n",
+"l=%pi*15e-2\n",
+"N=450\n",
+"I=2\n",
+"B=1.2\n",
+"u=B/(4*%pi*10^-7*N*I*l)\n",
+"disp('value of relative permeability='+string(u)+' ')"
+ ]
+ }
+,
+{
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "## Example 2.5: mmf.sce"
+ ]
+ },
+ {
+"cell_type": "code",
+ "execution_count": null,
+ "metadata": {
+ "collapsed": true
+ },
+ "outputs": [],
+"source": [
+"\n",
+"//calculate the mmf\n",
+"l=1.5\n",
+"u=1600\n",
+"B=1.2\n",
+"H1=B*l/(4*%pi*10^-7*u)\n",
+"la=1e-3\n",
+"ua=1\n",
+"H2=B*la/(4*%pi*10^-7*ua)\n",
+"H=H1+H2\n",
+"disp('total amprs turns ='+string(H)+' AT' , 'amprs turns='+string(H2)+' AT', 'amprs turns='+string(H1)+' AT')"
+ ]
+ }
+,
+{
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "## Example 2.6: magnetising_force_relative_permeability_magnetic_flux_density.sce"
+ ]
+ },
+ {
+"cell_type": "code",
+ "execution_count": null,
+ "metadata": {
+ "collapsed": true
+ },
+ "outputs": [],
+"source": [
+"\n",
+"//calculate the magnetising force relative permeability\n",
+"A=5e-4\n",
+"l=25e-2\n",
+"N=100\n",
+"I=2\n",
+"F=0.3e-3\n",
+"H=(N*I)/l\n",
+"u=(F*l)/(N*I*A*4*3.14*10^-7)\n",
+"B=(u*H*4*3.14*10^-7)\n",
+"I1=5\n",
+"F1=0.58e-3\n",
+"H1=(N*I1)/l\n",
+"u1=(F1*l)/(N*I*A*4*3.14*10^-7)\n",
+"B1=(u1*H*4*3.14*10^-7)\n",
+"disp('flux density B1=' +string(B1)+ 'Wb/m^2' ,'flux density B =' +string(B)+ 'Wb/m^2' )"
+ ]
+ }
+,
+{
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "## Example 2.7: Magnetising_Current.sce"
+ ]
+ },
+ {
+"cell_type": "code",
+ "execution_count": null,
+ "metadata": {
+ "collapsed": true
+ },
+ "outputs": [],
+"source": [
+"\n",
+"//calculate the magnitising current\n",
+"A=0.01\n",
+"l=2e-3\n",
+"u=1\n",
+"F=800e-6\n",
+"B=F/A//flux\n",
+"H=B/(4*3.14*10^-7*u)\n",
+"N=(H*l)\n",
+"L=150e-2\n",
+"v=600\n",
+"f=9.6e-4\n",
+"N1=(f*L)/(v*A*4*%pi*10^-7)\n",
+"N2=N1+N\n",
+"n=200\n",
+"M=N2/n\n",
+"disp( 'Magnetising current = '+string(M)+' A' , 'Total amps turns= '+string(N2)+' AT' , 'amps turn iron= '+string(N1)+' AT' , 'amps turn for air= '+string(N)+' AT' )"
+ ]
+ }
+,
+{
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "## Example 2.8: number_of_amperes_turns.sce"
+ ]
+ },
+ {
+"cell_type": "code",
+ "execution_count": null,
+ "metadata": {
+ "collapsed": true
+ },
+ "outputs": [],
+"source": [
+"\n",
+"//find the number of amprs turns required\n",
+"A=25e-4\n",
+"F=1.2e-3\n",
+"u=1 //air path\n",
+"l=0.25e-2\n",
+"N=(F*l/(4*%pi*10^-7*A*u))*2 // for two air gaps\n",
+"v=2000 // iron path\n",
+"L=50e-2\n",
+"N1=(F*L)/(v*A*4*%pi*10^-7)\n",
+"N2=N+N1\n",
+"disp( 'total amps turns = '+string(N2)+' AT' , 'amps turn for air= '+string(N1)+' AT' , 'amps turn for air= '+string(N)+' AT' )"
+ ]
+ }
+,
+{
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "## Example 2.9: ampere_turns.sce"
+ ]
+ },
+ {
+"cell_type": "code",
+ "execution_count": null,
+ "metadata": {
+ "collapsed": true
+ },
+ "outputs": [],
+"source": [
+"\n",
+"//calculate the circuit current\n",
+"u=1//for air gap\n",
+"F=1.5e-3//flux\n",
+"A=9e-4 //area \n",
+"B=F/A\n",
+"H=B/(4*3.14*10^-7*u)\n",
+"l=4e-3//air gap\n",
+"S=H*l//amps turns in air gap\n",
+"l=4e-3//air gap\n",
+"u1=800// for iron gap\n",
+"A1=750e-6\n",
+"B1=F/A1\n",
+"H1=B1/(4*3.14*10^-7*u1)\n",
+"l1=270e-3\n",
+"S1=H1*l1\n",
+"u2=1000//for P,Q,R\n",
+"H2=B/(4*3.14*10^-7*u2)\n",
+"Ip=135e-3\n",
+"Iq=270e-3\n",
+"Ir=135e-3\n",
+"S2=H2*(Ip+Iq+Ir)//amps turns\n",
+"TNn=S+S1+S2\n",
+"TN=4000\n",
+"EI=TNn/TN\n",
+"disp('exciting current= '+string(EI)+' amps' )"
+ ]
+ }
+],
+"metadata": {
+ "kernelspec": {
+ "display_name": "Scilab",
+ "language": "scilab",
+ "name": "scilab"
+ },
+ "language_info": {
+ "file_extension": ".sce",
+ "help_links": [
+ {
+ "text": "MetaKernel Magics",
+ "url": "https://github.com/calysto/metakernel/blob/master/metakernel/magics/README.md"
+ }
+ ],
+ "mimetype": "text/x-octave",
+ "name": "scilab",
+ "version": "0.7.1"
+ }
+ },
+ "nbformat": 4,
+ "nbformat_minor": 0
+}
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