Opposed Piston Motor

[tropes]

Hi all
For the last few years I have gone from building a permanent magnetic motor to building a pulse motor. My interest is linear-reciprocating rather than rotary and magnetic attraction rather than repulsion. I would like to converse with someone who has used permanent magnets to attract in a motor. My latest work can be seen at http://www.eebeh.com/piston.html . I have placed a link at the bottom of the page to the Opposed Piston Engine on which I am currently working.
Peter

[rukiddingme]

Hey peter,

I've been messing around with this concept as well.

Here's a document with the info I've gathered so far.

Hope it helps.

Best of luck

http://dreamslaughter.com/magforce/magforce.htm

Other overunity.com thread:

http://www.overunity.com/index.php?topic=1873.0

[tropes]

RUKIDDING
Thanks for the input. These are some of my observations: With my simple one piston motor, there is an increase in RPM when I add a PM in the attracting mode to the core bottom of the EM. There is a "bounce" rather than a sudden stop when the piston is attracted to the EM and if the timing is right, the EM force is sufficient to repel the piston over center where it is again attracted to the EM core.
Regarding your drawings and queries, if more than one cylinder (2 pistons) is used then the attracting force of one set of pistons will turn the crankshaft while the other is being released. Also, the PM pistons should not contact the EM core but should have an air gap between. There is a great difference in the force required to separate the two.
Thanks again
Peter

[rukiddingme]

RUKIDDING
Thanks for the input. These are some of my observations: With my simple one piston motor, there is an increase in RPM when I add a PM in the attracting mode to the core bottom of the EM. There is a "bounce" rather than a sudden stop when the piston is attracted to the EM and if the timing is right, the EM force is sufficient to repel the piston over center where it is again attracted to the EM core.

Yes, I think there is a gain in not using the EM to repel the PM. Just put enough current to the EM to release the magnetic grip. This is if you are using a crankshaft so that the action phase of the next PM pulls the just used PM away. The RPM's have to be right so that the residue magnetic field in the EM after the release pulse is timed to continue the grip release. We need to have a sawtooth waveform on the EMs field. On a guess the magnetic residue after the release pulse lasts maybe 20 to 50 milliseconds (I plan to do some tests next week to determine this value). We want the RPM to match this up against dissipation. If for instance the dissipation time is 100 milliseconds, we would want to have an rotation rate of 10 per second or 600 RPMs. Hopefully I?ll know this soon.

Regarding your drawings and queries, if more than one cylinder (2 pistons) is used then the attracting force of one set of pistons will turn the crankshaft while the other is being released.

Yes, of course, that?s the idea. The distance a piston moves is about 3 centimeters, the distance a big strong PM?s attraction becomes strong is about 2.5 centimeters. In the design the pistons are arranged to that they are all in the 3 centimeter distance. We want to have the pistons past the 90 degree spot on the crankshaft. So the attraction happens on the sweet spot of the crankshaft.

Another main reason you want to use two PMs on each side of the EM is because you get twice the amount of attraction and you use the same amount of power to release the grip of both PMs. Another reason is because by pulling a PM from both sides of an EM there is no induction, they cancel.

Also, the PM pistons should not contact the EM core but should have an air gap between. There is a great difference in the force required to separate the two.

Yes, the PM should not contact the EM for a number of reasons. We don?t want an actual electrical connection between the PM and the EM. Also the repeated contact would break the PM over time. The air gap makes it easier to release the grip, but it also makes it so there is not as much pull force. The attraction is greatly reduced by a gap. So we want to engineer the air gap as close as engineering can accomplish. For experiments use a piece of plastic about .5 millimeters between the PM and the EM. The final air gap is determined by the length of the piston. 


Thanks for your help.

[tropes]

RUKID
Much of what we are doing is "breaking new ground" but I think we are on the same wavelength. I think it would be of benefit if we used the same model to reference. Since I am in construction mode with a model partially built lets stick to my model. Perhaps you could use that CAD program to construct a drawing using my dimensions. I would send you these by email if you will do this.
Peter