Mex-Wcalc: air_coil

Mex-Wcalc: air_coil_syn

air_coil_syn - Single layer air core solenoid inductor synthesis

SYNOPSIS

[N_out, len_out, fill_out] = air_coil_syn(L, len, fill, AWG, rho, dia, freq, flag)

PARAMETERS

INPUT PARAMETERS

L : Desired inductance (Henries)
len : length of the coil (meters)
fill : ratio of coil length to closewound length
AWG : wire size (American Wire Gauge)
rho : resistivity of wire (ohm-m)
dia : inside diameter of coil (meters)
freq : analysis frequency (Hertz)
flag : indicates which parameters should be optimized
- flag=0 : the minimum number of turns is calculated along with the corresponding required length/fill. The diameter is held constant.
- flag=1 : the number of turns is fixed at the value given and the required length/fill is calculated. The diameter is held constant.

OUTPUT VALUES

N_out : calculated required number of turns
len_out : calculated required length (meters)
fill_out : calculated required fill

DESCRIPTION

Function to synthesize the physical parameters of a single layer, uniformly spaced, air core, solenoid inductor. The physical dimensions of the coil are synthesized from an inductance specification.

EXAMPLE

 % we want 220 nH
L=220e-9;
 % we'll synthesize the number of turns
N=0;
 % we'll synthesize the length/fill
len=0;
 % we'll synthesize the length/fill
fill=0;
 % wire size
AWG=22;
 % Resistivity of copper (ohm-m)
rho=1.72e-8;
 % 0.25 inches inside diameter
dia=0.25*0.0254;
 % 10 MHz operation
f=10e6;
 % synthesize for minimum number of turns
flag=0;
[Nout,len_out,fill_out] = air_coil_syn(L,N,len,fill,AWG,rho,dia,f,flag);
disp(sprintf('Number of turns = %g ',Nout));
disp(sprintf('Length=%g inches',len_out/0.0254));
disp(sprintf('Fill=%g',fill_out));