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Reverese polarity of electromagnet

S

smpaladin

Jan 1, 1970
0
I have a simple battery/electromagnet setup. Does anyone know how I
could set up a switch to reverse the polarity of the electromagnet?
(Besides switching the wires on the battery)
 
J

Jeroen

Jan 1, 1970
0
smpaladin said:
I have a simple battery/electromagnet setup. Does anyone know how I
could set up a switch to reverse the polarity of the electromagnet?
(Besides switching the wires on the battery)

A simple DPDT switch will do the trick: (view with a fixed font)

+ --+--o
| \----o magnet +
| -o
| |
---o
\----o magnet -
- ----+o

If you take a switch with 3 positions the middle position will turn the
magnet off
 
T

Tim Auton

Jan 1, 1970
0
Jeroen said:
A simple DPDT switch will do the trick:
[snip]

If it's not centre-off, make sure it's a break-before-make switch!


Tim
 
C

Claude Sylvain

Jan 1, 1970
0
Jeroen said:
A simple DPDT switch will do the trick: (view with a fixed font)

+ --+--o
| \----o magnet +
| -o
| |
---o
\----o magnet -
- ----+o

If you take a switch with 3 positions the middle position will turn the
magnet off

Sorry, but your schematics do not work.
I think this one will be better...

+ --+---o
| \----o magnet +
| +-o
| |
- ----+-o
| \----o magnet -
+---o


Never forget the make a design review ;-)
Claude
 
S

smpaladin

Jan 1, 1970
0
Claude Sylvain said:
Sorry, but your schematics do not work.
I think this one will be better...

+ --+---o
| \----o magnet +
| +-o
| |
- ----+-o
| \----o magnet -
+---o


Never forget the make a design review ;-)
Claude

Now is there any kind of switch that will reverse the polarity of the
coil electrically like in this picture?
http://www.geocities.com/smpaladin/switch.jpg

Once a current is applied to the red switch, it reverses the polarity
of the coil as long as the current is applied. If this sounds
ridiculous, don't blame me since I may have no idea what I'm talking
about.
 
P

Peter Bennett

Jan 1, 1970
0
Now is there any kind of switch that will reverse the polarity of the
coil electrically like in this picture?
http://www.geocities.com/smpaladin/switch.jpg

Once a current is applied to the red switch, it reverses the polarity
of the coil as long as the current is applied. If this sounds
ridiculous, don't blame me since I may have no idea what I'm talking
about.


The "red switch" would be a double pole, double throw relay, with its
contacts wired as shown above (but you'd probably also want another
switch to turn the coil off...)



--
Peter Bennett, VE7CEI
peterbb4 (at) interchange.ubc.ca
new newsgroup users info : http://vancouver-webpages.com/nnq
GPS and NMEA info: http://vancouver-webpages.com/peter
Vancouver Power Squadron: http://vancouver.powersquadron.ca
 
J

John Fields

Jan 1, 1970
0
Now is there any kind of switch that will reverse the polarity of the
coil electrically like in this picture?
http://www.geocities.com/smpaladin/switch.jpg

Once a current is applied to the red switch, it reverses the polarity
of the coil as long as the current is applied. If this sounds
ridiculous, don't blame me since I may have no idea what I'm talking
about.

---
This is seb; don't worry about it.

Here's one way to do it:

BAT+>--------+---------------------------+--O--> | S1
| | |
BAT->----+-----------------+ | O
| | NC K1A NO | NC K1B NO| |
| O-->\ <--O-+-O-->\ <--O |
| \- - - - - - - -\- - - - - -[COIL]
| O COM O COM |
| | | |
| | +-----+ |
| | | |
| | [MAGNET] |
| | | |
| +---------------------+ |
+---------------------------------------+

With S1 open, the polarity of the magnet will be oriented onE way, and
with S1 closed the polarity will reverse.
 
S

smpaladin

Jan 1, 1970
0
Peter Bennett said:
The "red switch" would be a double pole, double throw relay, with its
contacts wired as shown above (but you'd probably also want another
switch to turn the coil off...)

Could you refer me to more specific information about a double pole,
double throw relay? Thanks.
 
P

Peter Bennett

Jan 1, 1970
0
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