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I think you are right about keeping relays away from the windings. I also
think that, if you consider winding-switching to maximize polarizing
current, you would be better off using the same circuit elements (controls,
transistors, etc) to generating the optimal voltage and current to discharge
into the simple monofilar coil. After all, if you double voltage and halve
current, you are precisely at the same polarizing efficacy. A voltage
converter feeding a suitable capacitive storage bank should do.
Best regards,
Peter Boetzkes
----Original Message Follows----
From: [email protected]
Reply-To: "The Proton Mag Forum"
To: The Proton Mag Forum
Subject: Bifilar windings
Date: Thu, 18 May 2000 10:49:12 +0100
The Proton Mag Forum
Quoting Lee Fraser :
> The Proton Mag Forum
>
> I'm trying kerosene tomorrow if I get some wiring done.
Been thinking some more. (V Sad sorry)
Using a relay to switch the windings input could be a bad idea.
Solenoids and Magnetic fields and all that tesla & henry stuff.
A low power switching matrix (Maybe using the analogue MUX ICs from MAxim
or some such. may be tenable. Alternatively use surface mount transistors
the FET kind switch very quickly and have a low on resistance.
Use a power transistor to switch the Polarisation supply (With fly
wheel/protection diode as discussed, to siphon off back EMF).
Providing the low power switches are either full on or full of and are
only switched whilst the coil is effectively free of back or forward emf.
they should survice fine.
This way the switching element can be rugged, and close up to the coil
arangemnt and cause minimal disruption to the sensed magnetic field.
Switching times should also be better than for those of the contact
changeover for a relay.
Just thoughts
Cheers
Le Kirby
This message was sent by Easymail - http://www.easynet.co.uk/
__________________________________________________ ____________________
think that, if you consider winding-switching to maximize polarizing
current, you would be better off using the same circuit elements (controls,
transistors, etc) to generating the optimal voltage and current to discharge
into the simple monofilar coil. After all, if you double voltage and halve
current, you are precisely at the same polarizing efficacy. A voltage
converter feeding a suitable capacitive storage bank should do.
Best regards,
Peter Boetzkes
----Original Message Follows----
From: [email protected]
Reply-To: "The Proton Mag Forum"
To: The Proton Mag Forum
Subject: Bifilar windings
Date: Thu, 18 May 2000 10:49:12 +0100
The Proton Mag Forum
Quoting Lee Fraser :
> The Proton Mag Forum
>
> I'm trying kerosene tomorrow if I get some wiring done.
Been thinking some more. (V Sad sorry)
Using a relay to switch the windings input could be a bad idea.
Solenoids and Magnetic fields and all that tesla & henry stuff.
A low power switching matrix (Maybe using the analogue MUX ICs from MAxim
or some such. may be tenable. Alternatively use surface mount transistors
the FET kind switch very quickly and have a low on resistance.
Use a power transistor to switch the Polarisation supply (With fly
wheel/protection diode as discussed, to siphon off back EMF).
Providing the low power switches are either full on or full of and are
only switched whilst the coil is effectively free of back or forward emf.
they should survice fine.
This way the switching element can be rugged, and close up to the coil
arangemnt and cause minimal disruption to the sensed magnetic field.
Switching times should also be better than for those of the contact
changeover for a relay.
Just thoughts
Cheers
Le Kirby
This message was sent by Easymail - http://www.easynet.co.uk/
__________________________________________________ ____________________