Magnetics

Perform general magnetic formulas and conversions.

 

Transformers

This screen helps the operator perform the Transformer calculations of Turns Ratio, Voltage, the Current and Impedance conversions for the Turns Ratio calculations. The Core Area calculation determines the Core Area and it’s power handling. Finally the Primary Turns needed to input the magnetic field for a necessary number of turns to achieve.

 

Transformer Turns Ratio

Enter three knowns to calculate the unknowns. That is; enter V1, V2 and Z1 to calculate Z2. This will work for the others as well. One feature is to enter any two for one parameter and one each for the others to calculate the rest all at once.  Then press “Calculate” to get the Turns, Voltage Current or Impedance in Ohms. Press “Clear” to clear the coefficients and begin over. Press the “Close” button to quit the screen and go back to main menu.

 

Core Area

Enter the power in Watts and the Frequency of operation in Hz and then press “Calculate” to get the Area necessary to handle load in Inches Square . Press “Clear” to clear the coefficients and begin over. Press the “Close” button to quit the screen and go back to main menu.

 

Primary Turns

Enter Primary Voltage in Volts, Core Area in inches square, Flux of field in Gauss and the Frequency of operation in Hz and then press “Calculate” to get the number of turns necessary to achieve the power and coupling. Press “Clear” to clear the coefficients and begin over. Press the “Close” button to quit the screen and go back to main menu.

 

Figure 43 – Magnetics Transformers

 

Power/Work

Enter any two of the inputs to calculate the others and then press “Calculate” to get the remaining parameters. For instance enter colts and current and it will calculate the resistance power and work. Enter the motor-generator efficiency of work to power. Default efficiency is 90% (typical efficiency modern day). Press “Clear” to clear the coefficients and begin over. Press the “Close” button to quit the screen and go back to main menu.

 

Figure 44 – Magnetics Power and Work

 

Calculations

In this screen are the calculations of Magnetic Law, Single Layer Coil and Multi-Layer Coil.

 

Magnetic Law – Flux Option

If the Flux option is selected the variables are Magneto Motive Force or MMF, lines per cm and the reluctance in Reluctance (Rels). Enter any two of the inputs to calculate the others and then press “Calculate” to get the remaining parameters.   Press “Clear” to clear the coefficients and begin over. Press the “Close” button to quit the screen and go back to main menu.

 

Figure 45 – Magnetic Calculations Flux

 

Magnetic Law – Flux Density Option

If the Flux Density option is selected the variables are lines per cm, permeability (u) as relative to free space relativity, and the MMF. Enter any two of the inputs to calculate the others and then press “Calculate” to get the remaining parameters.   Press “Clear” to clear the coefficients and begin over. Press the “Close” button to quit the screen and go back to main menu.

 

Figure 46 – Magnetic Calculations Flux Density

 

Inductance

Used to perform the basic Inductance calculations for Single and Multi layer Air Coils and Toroidal inductors.

 

Single Layer Coil

Enter the inputs Inner Radius and the Length all in cm and the number of turns and press “Calculate” to calculate the Inductance in micro Henries.   Press “Clear” to clear the coefficients and begin over. Press the “Close” button to quit the screen and go back to main menu.

 

Multi-Layer Coil

Enter the inputs Inner Radius1, Outer Radius2, the Length all in cm and the number of turns and press “Calculate” to calculate the Inductance in micro Henries.   Press “Clear” to clear the coefficients and begin over. Press the “Close” button to quit the screen and go back to main menu.

 

Toroidal Coil

This function can figure the Inductance of a Toroidal Coil either if two ways. One can use the inductance Factor from manufacturers data sheets, or you can find the Inductance Index from the Area, Outer Radius and the Permeability of the toroid. Enter the Area in Cm Square , the Outer Radius in cm, and for the permeability with the check box checked select the appropriate factor and material, if check box is unchecked user must enter the permeability factor in text box.

Next enter the number of turns and press “Calculate” to figure the Inductance Index and the final Inductance. As an additional feature, if just the Inductance Index is used, the user can input any of Inductance Index, Number of Turns or the Inductance. Leave any one blank and “Calculate” will figure the missing component. Press “Clear” to erase all boxes and set to default the permeability. Press “Close”  to close the form and return to the main menu.

 

Figure 47 - Magnetics Inductance

Inductance2

This section will perform an inductance calculation from the dimensional information and the coil resistance. This formula substitutes for the wire current and number of turns. Enter the Average Diameter, coil cross sectional width and heath and the coil resistance. Press Calculate to figure or Clear to erase.

 

Figure 48 – Magnetics – Inductance 2

 


Conversions

This section performs magnetic unit conversions. Enter any entry or all, as I have, and get the conversion for whichever fields have entries. I entered all 1’s in the right hand side and got the conversion factors on the other. Press Calculate to compute and display. Clear to reset and reenter value to retry and Close to Quit.

 

Figure 49 - Magnetic Unit Conversions

 

Magnetic Field

Need to finish testing and checking and document in this section.

 

Cylindrical

This section will perform the calculation of a Cylindrical Coils Magnetic Field and more. I selected the appropriate button radio selection “Cylindrical Coil”. I also checked the check box that will used the predefined magnetic permeability in the pull down combo box. I have most used values in table. Un-checking the box will allow the user to input any value permeability. The user can also add to the lookup table by editing the INI file. Please read notes regarding editing this file. Next the user enters the Radius, Coil Length, Number of Turns, Current flowing thru and the over all Magnetic Field Path Length (i.e. closed circuit like transformer/motor. Press Calculate to compute and display. Clear to reset and reenter value to retry and Close to Quit.

Figure 50 – Magnetic Field for Cylindrical coils

 

Toroidal

This section will perform the calculation of a Toroidal Coils Magnetic Field and more. I selected the appropriate button radio selection “Toroidal Coil”. I also checked the check box that will used the predefined magnetic permeability in the pull down combo box. I have most used values in table. Un-checking the box will allow the user to input any value permeability. The user can also add to the lookup table by editing the INI file. Please read notes regarding editing this file. Next the user enters the (Inner) Radius, Outer Radius, Coil Length, Number of Turns, and Current flowing thru. Press Calculate to compute and display. Clear to reset and reenter value to retry and Close to Quit.

 

Figure 51 - Magnetic Field for Toroidal Coils

 


Rectangular

This section will perform the calculation of a Rectilinear Coils Magnetic Field and more. I selected the appropriate button radio selection “Rectilinear Coil”. I also checked the check box that will used the predefined magnetic permeability in the pull down combo box. I have most used values in table. Unchecking the box will allow the user to input any value permeability. The user can also add to the lookup table by editing the INI file. Please read notes regarding editing this file. Next the user enters the Radius, Coil Length, Number of Turns, Current flowing thru and the over all Magnetic Field Path Length (i.e. closed circuit like transformer/motor. Press Calculate to compute and display. Clear to reset and reenter value to retry and Close to Quit.

Figure 52 - Magnetic Field for Rectangular Coils and Transformers

 

Electro-Mechanics

This section is for computing the equivalence of force and magnetic fields. In the Single wire case it will figure force to field or field to force. In the case of Motor and Generators it will estimate the current, voltage and force needed or generated for a motor or generator.

 

Single Wire Force

This screen contains the function to figure the Force a Wire in a magnetic field has or can figure from the Force the missing component of the field makeup. Theta defaults to 90 degrees – max force. All the other inputs can be entered and whichever is missing will be figured. That is enter any of the Flux in Tesla, Length of the wire in cm Current in Amps and/or the Force to figure the missing component. Press Calculate to compute and display. Clear to reset and reenter value to retry and Close to Quit.

 

Figure 53 – Magnetics Electro Mechanics Single Wire Force

 

 

Motor and Generator

Still under development

 

Magnetic Field2

This tab will help the operator calculate the magnetic field strength around a wire. The operator can enter any 2 of the three values to calculate. So enter the Current and Distance to calculate Field Strength. Or from the Field Strength needed, calculate the current or distance, whichever is not present. Also you can add the dimensional Diameter and Length to get the wires inductance. Press Calculate to compute and display the results or Press Clear to clear the text boxes for re-entry for another calculation or Close to Close the form.

 

Figure 54 – Magnetic Field Strength around a wire

Inductance per turn

This screens functions help the operator perform the Inductance per turn from two of the three parameters. Enter any two and press Calculate to compute the remaining variable, Close to quit and Clear to retry new values.

Figure 55 - Inductance per Turn

 

Bmax DC&AC

This is used to compute the DC and AC core flux. Enter the left side variables and press Calculate to compute the remaining variable, Close to quit and Clear to retry new values. It will compute the DC and AC flux components and the total core flux maximum at AC peak.

 

Figure 56 – B Max DC & AC