The calculations in this question are based on my previous quesion:
How many turns do I need for the primary coil of a transformer?
Marko Buršič said : "B_max shall be between 1.3T and 1.6T, but not more than 1.6T."
I calculate the minimum number of turns so that the core is not saturated:
B=1.6 and f=50Hz
Area = 0.009 * 0.015 = 1.35 * 10^-4 sq m
N = 220 / (4.44 * 50 * 1.6 * 1.35 * 10^-4)
N = 4587 turns.
I think the number of turns is too much, Am I missing something ?
According to Andy aka equations:
L = N^2 * AL = 210 H
XL = 2 * PI * f * L = 66 K ohm
I = 3.33 mA. (primary coil)
If I need 12 volts on the secondary coil:
I = 60 mA (This is too little for the secondary coil, I'm missing something here too)
Here's my core dimensions (cm):
Thank you for all your assistance, Andy aka and Marko Buršič, I really appreciate your help. And special thanks to Andy aka who answered a lot of my question and taught me much useful information 🙂
Best Answer
I don't know much about transformer calculation, but I would think that 12mA will be your primary current when there is no load on the secondary, and that seems fine. Connecting the load to the secondary winding will cause the current flow and effectively reduce inductance seen from primary side. (I think).