#
|
Parameter |
Conditions |
Value and Notes |
1 |
Expected coil parameters |
|
0 Ohms min, 0.14 Ohms typ, 0.17 Ohms max. 1uH max. |
2 |
Current |
Per phase, independantly adjustable. |
20A peak (14.1A rms). Maybe raise to 25Ap. |
3 |
Current as related to amplitude control word, 0 to 4095 |
Icoil = 0.2 * 10^((n /4095) where n is amplitude value, Icoil is peak current. |
4 |
Frequency |
|
Either preset at anything up to 25KHz (now using 20KHz) or internal switch setting to one of 32 set frequencies. |
5 |
Frequency stability |
Over time and ambient temperature |
±50PPM max |
6 |
Frequency synthesis, amplitude |
For any output current. |
12-bit (increments are 5e-5 of peak) |
7 |
Frequency synthesis, temperal |
Frequency dependant. |
1024 samples per cycle (e.g. every 50nS for 20KHz).
|
8 |
Phase shift control word, 0 to 255. |
Phi-X is reference, phi-Y adjustable |
0 to180° in 256 steps of 0.703°. |
9 |
Enable/disable |
|
Within 50nS. |
10 |
Offset current when disabled |
Trimpot adjustable |
Drift TBD, should be <1mA. |
11 |
Current noise when disabled |
|
TBD but estimated as insignificant. |
12 |
Current sensitivity to resistance changes of coils |
|
<1e-3 |
13 |
Interaction of the two phases |
With one pahse at 20Ap and the other zero
|
TBD but estimated at <10mA. |