Or you could use a mosfet to make use of "synchronous rectification". Less lose of energy that way, a mosfet will drop less voltage than a diode.How about this for recovering energy?
Same principle as a boost converter.
Or you could use a mosfet to make use of "synchronous rectification". Less lose of energy that way, a mosfet will drop less voltage than a diode.How about this for recovering energy?
Same principle as a boost converter.
I took the clutch off of mine and put a variable speed DC drive on it instead. Bought it at an auction and had to take it apart to get it out of a basement.I have a Logan too! It's a 1954 920. I bought it for $50.00 stripped. HS, TS, Carriage. All gears were missing, so it was converted to a wood turning lathe. I made a foot clutch/brake that works very well because flat belts clutch well.
I bought it way back in the early to mid 70's from a club member when I was a member of the Suffolk County Radio Club in LI N.Y. How the hell I lived through those winters escapes me!
Chris
I did quite a bit of searching to find this.. You owe me!Does anyone have a good link to build threads for these solenoid engines?
Synchronous rectification won't apply here I'm afraid. The idea is to get the current moving through the solenoid as quickly as possible, and stop it as quickly as possible (without burning up anything). The former is usually accomplished by increasing the supply voltage, and then an active current limiter can be used (aka "chopper driver", used with stepper motor control circuits). The current will be stopped most quickly if there is no current path, but the collapsing magnetic field can generate VERY high peak voltages; odds are that the insulation of something will be broken down by that, with eventual system failure.Or you could use a mosfet to make use of "synchronous rectification". Less lose of energy that way, a mosfet will drop less voltage than a diode.
I took the clutch off of mine and put a variable speed DC drive on it instead. Bought it at an auction and had to take it apart to get it out of a basement.
Sarge, you're bringing up a very good point here and it really begs the question of what these machinists are using for back EMF suppression. It seems to be an un-addressed issue by the modelers.Synchronous rectification won't apply here I'm afraid. The idea is to get the current moving through the solenoid as quickly as possible, and stop it as quickly as possible (without burning up anything).
Why on earth do you need to stop the current as soon as possible? These things run at a few Hz!Synchronous rectification won't apply here I'm afraid. The idea is to get the current moving through the solenoid as quickly as possible, and stop it as quickly as possible (without burning up anything).
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by Jake Hertz
by Duane Benson
by Duane Benson
by Jake Hertz