P
peter
Guest
I'm disabled, and I need help to design an electrical circuit for a
medical item, which I don't think is available commercially
It's a small airpump, literally the size and power of a small aquarium
pump (about 5 watts), but it needs to be powered by 12 or 24v dc, and
not mains powered.
A mains powered aquarium pump has a permanent magnet which oscilates
in the face of an electromagnetic, and this motion moves a diaphragm.
The oscilation is provided by the alternating current, ie the diagram
is moved by a very small amount approximately 50 times per second
Is it possible to do the same thing with DC? I need to find out
firstly if it is feasible to re wire the electromagnet to take a DC
current to provide approximately 5w of power. And secondly, is it
possible to design an electrical circuit which provide the same
approximately 50 times per second oscilation?
Ideally, these oscilations would literally be the same as what is
achieved with mains power. I was hoping it will be possible to design
a circuit which firstly powers the electromagnet with current going in
one direction, then switching to power the electromagnetic with
current going in the other direction, similar to what happens in an
electric motor. This will power to diaphragm both as it contracts and
also to expand it back to rest.
If this is not possible, is it possible to design a circuit which only
powers the electromagnet briefly to contract the diaphragm, and during
the brief period when power is then switched off, relying on a small
spring to pull the diaphragm back to rest, and then pulse briefly on
again and so on
It also needs to be reliable. It will be used continuously for 12
hours daily, and will need to have a reasonable working life before
items wear out or need replacing and so on (incidentally, its use is
not like sustaining !! It will be used in a pressure management system
in an air cushion, which disabled people have to rely on to ease
pressure on bits of aging bodies that they sit on for long period of
time !!) .
Any suggestions, direct help, comments or anything else that is useful
would be much appreciated.
medical item, which I don't think is available commercially
It's a small airpump, literally the size and power of a small aquarium
pump (about 5 watts), but it needs to be powered by 12 or 24v dc, and
not mains powered.
A mains powered aquarium pump has a permanent magnet which oscilates
in the face of an electromagnetic, and this motion moves a diaphragm.
The oscilation is provided by the alternating current, ie the diagram
is moved by a very small amount approximately 50 times per second
Is it possible to do the same thing with DC? I need to find out
firstly if it is feasible to re wire the electromagnet to take a DC
current to provide approximately 5w of power. And secondly, is it
possible to design an electrical circuit which provide the same
approximately 50 times per second oscilation?
Ideally, these oscilations would literally be the same as what is
achieved with mains power. I was hoping it will be possible to design
a circuit which firstly powers the electromagnet with current going in
one direction, then switching to power the electromagnetic with
current going in the other direction, similar to what happens in an
electric motor. This will power to diaphragm both as it contracts and
also to expand it back to rest.
If this is not possible, is it possible to design a circuit which only
powers the electromagnet briefly to contract the diaphragm, and during
the brief period when power is then switched off, relying on a small
spring to pull the diaphragm back to rest, and then pulse briefly on
again and so on
It also needs to be reliable. It will be used continuously for 12
hours daily, and will need to have a reasonable working life before
items wear out or need replacing and so on (incidentally, its use is
not like sustaining !! It will be used in a pressure management system
in an air cushion, which disabled people have to rely on to ease
pressure on bits of aging bodies that they sit on for long period of
time !!) .
Any suggestions, direct help, comments or anything else that is useful
would be much appreciated.