function onPageLoad() { //English Units /* document.AppForm.txtBr.value = 12500; document.AppForm.txtBh.value = 37.4; document.AppForm.txtZ.value = 0; document.AppForm.txtL.value = 1; document.AppForm.txtOD.value = 0.5; document.AppForm.txtID.value = 0; */ calcCommonSetup(); } function doCalc() { var br = parseFloat(document.AppForm.txtBr.value); var z = parseFloat(document.AppForm.txtZ.value); var l = parseFloat(document.AppForm.txtL.value); var od = parseFloat(document.AppForm.txtOD.value); var id = parseFloat(document.AppForm.txtID.value); if(document.AppForm.txtID.value == "") id = 0; if(document.AppForm.ddlMaterials.selectedIndex == 0) { alert('Please select a material!'); document.AppForm.ddlMaterials.focus(); return false; } if ( isNaN(br) ) { alert('Please enter a Br value!'); document.AppForm.txtBr.focus(); return false; } if ( isNaN(z) ) { alert('Please enter a Z value!'); document.AppForm.txtZ.focus(); return false; } if ( isNaN(l) ) { alert('Please enter an L value!'); document.AppForm.txtL.focus(); return false; } if ( isNaN(od) ) { alert('Please enter an OD value!'); document.AppForm.txtOD.focus(); return false; } if ( isNaN(id) ) { alert('Please enter an ID value!'); document.AppForm.txtID.focus(); return false; } //Ensure that all values are in SI br = convertInductionToSI(br); z = convertLengthToSI(z); l = convertLengthToSI(l); od = convertLengthToSI(od); id = convertLengthToSI(id); //The effective length/thickness var le = l * getMaterialK(); //in Tesla //var fieldStrength = br * (((z + le) / Math.sqrt(4 * Math.pow(z + le, 2) + od*od)) - ((z / Math.sqrt(4 * z*z + od*od)))) - br * (((z + le) / Math.sqrt(4 * Math.pow(z + le, 2) + id*id)) - ((z / Math.sqrt(4 * z*z + id*id)))); var fieldStrength = br * (((z + le) / Math.sqrt(4 * Math.pow(z + le, 2) + od*od)) - ((z / Math.sqrt(4 * z*z + od*od)))); //Only use this part of the equation if the inner diameter is set if(id != 0) { fieldStrength = fieldStrength - br * (((z + le) / Math.sqrt(4 * Math.pow(z + le, 2) + id*id)) - ((z / Math.sqrt(4 * z*z + id*id)))) } if(isNaN(fieldStrength)) { alert("An error occurred during calculation"); return false; } if(document.AppForm.ddlUnits.value == units.English) fieldStrength = fieldStrength * 10000; //convert to Gauss document.AppForm.answer.value = roundNum(fieldStrength); return true; }

Magnetic Field Strength – Gauss Equations for Cylinders

These calculations are appropriate for “straight line” (referring to the Normal, B versus H hysteresis loop) magnetic materials such as sintered and bonded ferrite, fully dense neodymium-iron-boron and sintered samarium cobalt magnets.

Please input all values then click on “Calculate”. If the ID = 0 (solid cylinder), it may be left blank.

Magnetic Field Strength – Gauss Equations for Cylinders

SI English

---Please Select--- Ferrite SmCo 1:5 SmCo 2:17 NdFeB
gauss
MGOe
in.
in.
in.
in.

ANSWER:

gauss

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