This program computes the mutual inductance of a pair of coaxial circular coils as a function of the two radii and their axial separation (see tables 2-4). All units are MKS. The geometry of the coils is shown below:
| Step | Instructions | Input data/units |
Keys | Output data/units |
|---|---|---|---|---|
| 1 | Load sides 1 and 2 | - | - | - |
| 2 | Load data card containing con- stants into secondary for evalua- tion of elliptic integrals (all dimensions in m). |
- | - | - |
| 3 | Enter first coil radius | r | ENT | - |
| 4 | Enter second coil radius | R | ENT | - |
| 5 | Input coil spacing After coil radii have been input once, the variation of M with x can be found as follows: |
x | A | M |
| 6 | Enter coil spacing | x | D | M |
| RO | First coil radius |
| R1 | SEcond coil radius |
| R2 | Coil spacing |
| R3 | Ratio of coil spacing |
| R6 | k |
| R7 | m=k3 |
| R8 | E(m), elliptic integral of first kind |
| R9 | K(m), elliptic integral of second kind |
| RA | m1 = 1- m |
| SO | 1.3862944 |
| S1 | 0.1119723 |
| S2 | 0.0725296 |
| S3 | 0.5 |
| S4 | 0.1213478 |
| S5 | 0.0288729 |
| S6 | 0.4630151 |
| S7 | 0.1077812 |
| S8 | 0.2452727 |
| S9 | 0.0412496 |
M = mutual inductance pf coil pair (henries)
where
Complete elliptic integrals of the first and second kind are
The test case is: r = 0.2, R = 0.25, and x
= 0.1, which should be inserted as follows: 0.2 [ENT 
] 0.25 [ENT ] 0.1 [A] 
2.4877X10-7
at x = 0.2 m, 0.2 [D] 1,23945X10-7.
Rational approximations to K(m) and
E(m) are from reference 14.
| Step | Key entry | Comments | Step | Key entry | Comments | Step | Key entry | Comments |
|---|---|---|---|---|---|---|---|---|
| 001 | *LBLA | - | 040 | RCL 1 | - | 080 | RCL A | - |
| - | STO 2 | x | - | x | - | 1/x | - | - |
| - | R  |
- | - |  |
- | - | LN | - |
| - | STO 1 | R | - | x | - | - | x- | - |
| - | R |
- | - | 8 | - | - | + | - |
| - | STO 0 | r | - | x | - | - | P  S |
- |
| - | *LBL a | - | - |  |
- | - | STO 9 | K(m) |
| - | RCL 0 | - | x | - | - | - | P S |
- |
| - | RCL 1 | - | - | RCL 6 | - | - | RCL 7 | - |
| 010 |  |
- | - | |
- | - | RCL A | - |
| - | STO 3 |  =
r/R |
050 | EEX | - | 090 | x | - |
| - | RCL 0 | - | - | CHS | - | - | RCL 6 | - |
| - | RCL 1 | - | - | 7 | - | - | + | - |
| - | + | - | - | x | - | - | RCL A | - |
| - | x2 | - | - | RTN | - | - | x | - |
| - | RCL 2 | - | - | *LBL E | - | - | 1 | - |
| - | x2 | - | - | RCL 7 | - | - | + | - |
| - | + | - | - | 1 | - | - | RCL 9 | - |
| - | 1/x | - | - |  |
- | - | RCL A | - |
| 020 | 4 | - | - | CHS | - | - | x2 | - |
| - | x | - | 060 | STO A | - | 100 | x | - |
| - | RCL 0 | - | - | P S |
- | - | RCL 8 | - |
| - | x | - | - | RCL 2 | - | - | RCL A | - |
| - | RCL 1 | - | - | RCL A | - | - | x | - |
| - | x | - | - | x | - | - | + | - |
| - | STO 7 | k2 = m | - | RCL 1 | - | - | RCL A | - |
| - | |
- | - | + | - | - | 1/x | - |
| - | STO 6 | k | - | RCL A | - | - | x | - |
| - | GSB E | - | - | x | - | - | x | - |
| 030 | 1 | - | - | RCL 0 | - | - | + | - |
| - | RCL 7 | - | 070 | + | - | 110 | P S |
- |
| - | 2 | - | - | RCL 5 | - | - | STO 8 | E(m) |
| - | |
- | - | RCL A | - | - | RTN | - |
| - | |
- | - | x | - | - | * LBL D | - |
| - | RCL 9 | - | - | RCL 4 | - | - | STO 2 | - |
| - | x | - | - | + | - | - | RCL 0 | - |
| - | RCL 8 | - | - | RCL A | - | - | GTO a | - |
| - | |
- | - | x | - | 117 | RTN | - |
| - | RCL 0 | - | - | RCL 3 | - | - | - | - |
| - | - | - | - | + | - | - | - | - |
|
Curator: Al Globus If you find any errors on this page contact Al Globus. |
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