A
Arch-lab
- Jan 1, 1970
- 0
Hi,
How do I tell if my inductor is saturated? I am generating an EM field
using an RLC circuit. When I measure my field on a receiver circuit it measures
that the generated field is steadily dropping (somewhat exponentially) until it
stabilizes out several minutes later... it can take > 6 minutes.
Can anyone provide insight into this.
In particular:
1. Can you describe this using the BH curve?
For example, if it is going into saturation, then it should start to draw more
current. However, from my measurements it appears as though the current is
slowly decreasing over time. I.e. I put a 1 ohm in series to measure the
voltage (i.e. get current) and this voltage just kept dropping until it reached
a somewhat steady point.
2. How would this be traced out on the curve, is the curve settling so that
Bmax = |Bmin|, and it is just moving around forever >5min... or is it a issue
with core heating, or is it some other thing...
3. Does it fit that I see some memory effect. I.e. if I turn the EM field back
on after 5 minutes of being turned off it hasn't "recovered" to start at the
value that it initially started to "drop" from when it has been sitting for a
while.
4. Is this just the ferrite material (if this is a saturation problem). Because
I know I have to drop my current to fix it then - however, would it be possible
to keep the same current, and thus the same "stronger" EM field if I just had a
different ferrite that was less permeable...
Thanks a ton!
How do I tell if my inductor is saturated? I am generating an EM field
using an RLC circuit. When I measure my field on a receiver circuit it measures
that the generated field is steadily dropping (somewhat exponentially) until it
stabilizes out several minutes later... it can take > 6 minutes.
Can anyone provide insight into this.
In particular:
1. Can you describe this using the BH curve?
For example, if it is going into saturation, then it should start to draw more
current. However, from my measurements it appears as though the current is
slowly decreasing over time. I.e. I put a 1 ohm in series to measure the
voltage (i.e. get current) and this voltage just kept dropping until it reached
a somewhat steady point.
2. How would this be traced out on the curve, is the curve settling so that
Bmax = |Bmin|, and it is just moving around forever >5min... or is it a issue
with core heating, or is it some other thing...
3. Does it fit that I see some memory effect. I.e. if I turn the EM field back
on after 5 minutes of being turned off it hasn't "recovered" to start at the
value that it initially started to "drop" from when it has been sitting for a
while.
4. Is this just the ferrite material (if this is a saturation problem). Because
I know I have to drop my current to fix it then - however, would it be possible
to keep the same current, and thus the same "stronger" EM field if I just had a
different ferrite that was less permeable...
Thanks a ton!