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Re: TC Inductance Formulas...



At 08:33 AM 2/21/96 +0700, you wrote:

<snip>

>Tim:
>	What are the vital statistics for the coil whose inductance
>you are calculating?
>Ed Phillips
>

You asked for it Ed,

        =========================        
        Tesla Coil Calculations A                             TC_6A.ASC
        =========================
        ---------------------------------------------------------------
        Tesla Coil Physical Specifications
        ---------------------------------------------------------------
        ---------------------------------------------------------------
        Coil Form Specifications
        ---------------------------------------------------------------
        
        Coil Form Polymer Type        : Thermoplastic
        Coil Form Polymer Material    : Clear Cast Acrylic
        Chemical Polymer Material     : polymethyl-methacrylate 
        Coil Form Outer Diameter      : 6in
        Coil Form Inner Diameter      : 5.875in
        Coil Form Thickness           : 0.125in
        -------------------------------------------------------------        
        Mechanical Properties
        -------------------------------------------------------------
        Tensile Strength, lb/in^2                          : 11000
        Tensile Modulus, lb/in^2 * 10^-5                   : 4.5
        Elongation, %                                      : 10%
        Compressive Strength, lb/in^2                      : 18000
        Flexural Strength, lb/in^2                         : 17000
        Impact Strength, ft*lb/m of notch                  : 0.5
        Hardness, Rockwell                                 : M105
        Izod Impact Strength, notch 1/8in. sample          : 0.4
        Deformation under load (2000psi,122F), %           : 0.3% 
        -------------------------------------------------------------
        Electrical Properties
        -------------------------------------------------------------
        Dielectric Strength (step-by-step), V/mil          : 350 V/mil
        Dielectric Constant (60Hz)                         : 4.0
        Dielectric Constant (1MHz)                         : 3.5
        Dielectric Constant (1GHz)                         : 3.2
        Dissipation Factor (60Hz)                          : 0.04
        Dissipation Factor (1MHz)                          : 0.03
        Dissipation Factor (1GHz)                          : 0.02
        Volume Resistivity (ohms*cm)                       : 10^14
        Arc Resistance (SS Electrode), sec.                : *NT
        -------------------------------------------------------------
        Thermal Properties
        -------------------------------------------------------------
        Heat Distortion Temp at 264 lb/in^2                : 210F
                                                           : 98.889C
                                                           : 372.03889K
        Deflection Temperature (F at 66psi fiber stress)   : 185F
                                                           : 85C
                                                           : 358.15K
        Max. Recommended Service Temp. (intermittent use)  : 190F
                                                           : 87.778C
                                                           : 360.92778K
        Max. Recommended Service Temp. (Continuous use)    : 145F 
                                                           : 62.778C
                                                           : 335.92778K
        Coeff. of Linear Thermal Expansion, K^-1 * 10^5    : 9 
        Thermal Conductivity, cal/(cm^2*s*C*cm*10^-4)      : 1.4
        Flammability, in/min                               : 1.2
        ------------------------------------------------------------
        Chemical Properties     
        ------------------------------------------------------------
        Underwriters' Lab Rating (Subj. 94)                : HB     
        Specific Gravity                                   : 1.18
        Water Absorbtion, % in 24h                         : 0.4
        
        Not Resistant to : aromatic solvents    
                         : ketones
                         : esters
                         : chlorinated solvents

             * NT = No Tracking
        
        -------------------------------------------------------------------
        Wire Specifications
        -------------------------------------------------------------------
        
        Magnet Wire Type             : Heavy Armored Poly-Thermaleze
        Magnet Wire Manufacturer     : Belden
        Magnet Wire Gauge            : 22 AWG

        # of Insulating Coats        : 2
        Insulating Coat #1 Type      : Cross-Linked Modified Polyester
        Insulating Coat #2 Type      : Amide-Imide Polymer
        Insulating Coat #1 Thickness : 0.8167 mils  (8.167e-4 in)
        Insulating Coat #2 Thickness : 0.4083 mils  (4.083e-4 in)
        Total Insulating Thickness   : 1.2250 mils  (1.225e-3 in)

        Conductor Material Type      : Solid Rod Copper 
        Conductor Material Diameter  : 0.02535 in

        Magnet Wire Diameter     d[w]: 0.02780 in
        Turns Per Inch            TPI: 36.0 TPI     (approx.)
        Turns Per Inch            TPI: 35.971223022 (exact)
        -------------------------------------------------------------------
        Physical Coil Parameters
        -------------------------------------------------------------------
        
        Coil Form Diameter                   d:  6in
                                              :  15.24cm
                                              :  0.1524m

        Mean Coil Winding Diameter        d[m]:  6.0278in
                                              :  15.310612cm
                                              :  0.15310612m

        Prime Coil Winding Diameter       d[p]:  6.00245in
                                              :  15.246223cm
                                              :  0.15246223m

        Coil Form Radius                     r:  3in
                                              :  7.62cm
                                              :  0.0762m

        Mean Coil Winding Radius          r[m]:  3.0139in
                                              :  7.655306cm
                                              :  0.07655306m

        Prime Coil Winding Radius         r[p]:  3.001225in
                                              :  7.6231115cm
                                              :  0.076231115m

        Length of Coil Winding               h:  25in
                                              :  63.5cm
                                              :  0.635m

        Cross-Sectional Area                 A:  28.2743338823in^2
        of Coil Form                          :  182.414692475cm^2
                                              :  0.018241469248m^2

        Mean Cross-Sectional Area         A[m]:  28.5369496967in^2
        of Coil Winding/Form                  :  184.108984663cm^2
                                              :  0.0184108984663m^2

        Prime Cross-Sectional Area        A[p]:  28.2974293027in^2
        of Coil Winding/Form                  :  182.563694889cm^2
                                              :  0.0182563694889m^2

        Length of Wire                       l:  16951.0394978in
        in Coil Winding                       :  1412.58662482ft
                                              :  43055.6403244cm
                                              :  430.556403244m

        Mean Length of Wire               l[m]:  17029.5793141in
        in Coil Winding                       :  1419.13160951ft
                                              :  43255.1314579cm
                                              :  432.551314579m

        Prime Length of Wire              l[p]:  16957.9611723in
        in Coil Winding                       :  1413.16343102ft
                                              :  43073.2213775cm
                                              :  430.732213775m

        # of turns in Winding                N:  899.28057554 turns
        
        Aspect Ratio (h:d)                 h/d:  4.16666666667:1
        Mean Aspect Ratio (h:d[m])      h/d[m]:  4.14745014765:1
        Prime Aspect Ratio (h:d[p])     h/d[p]:  4.16496597223:1

        NOTE:  r, d, A, and l are all based on nominal approximate 
               measurements.

               r[m], d[m], A[m], and l[m] are the mean radius, mean 
               diameter, mean cross-sectional area, and mean wire length 
               respectivily, taken from the center of the coil form to 
               the center of the wire in the winding.
               
               r[p], d[p], A[p], and l[p] are the prime radius, prime 
               diameter, prime cross-sectional area, and prime wire
               length respectivily, taken from the center of the coil 
               form to the inner side of the conductor in the wire 
               (accounts for the insulation around the conducting wire).


Sorry so long, but it was all in one file, did not feel like reading through
and editing non-vital specifications...Sorry.

Tim

o------------------------------------oo---------------------------------o
| Timothy A. Chandler                ||   M.S.Physics/B.S.Chemistry     |
o------------------------------------oo---------------------------------o
| NASA-Langley Research Center       ||   George Mason University       |
| Department of Energy               ||   Department of Physics         |
| FRT/Alpha - NASALaRC/DOE JRD/OPM   ||   Department of Chemistry       |
| CHOCT FR Designation #82749156/MG09||   OPC-EFC                       |
o------------------------------------oo---------------------------------o
|                 Private Email Address:  tchand-at-slip-dot-net               |
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