Mostly Permanent Magnet Motor with minimal Input Power

[gotoluc]

Hello gotoluc, thanks for continuing your experiments 

Very interesting to know it is not linear

When you say: "pulls 520g for 1.2 watts input.  However, if I drop the current it can pull 200g with .3 watts input", it is just ratio of force against electrical power; could tel us in how many th of second it lifts them in each case?

Cheer.

That's the problem!  I don't  have an accurate way of calculating such a fast and small amount of time for a movement.

All I can do is do that ca be accurate is a test of Joule energy (capacitive discharge) and measure how high it travels.

Luc

[gotoluc]

Hi Luc,
this is a big step in the right direction.
If it takes 1 second, than the mechanical equivalent of .3 w X sec (.3 joyles) equals
3 kG x cm, and the efficiency is still below 10 %.
Perhaps you may add few more magnets, or increase number of strokes per second or both?

Hi telecom,

I think it would be more like 1/4 of a second to travel 1 cm in the modified version.

All I did to double the pull force (from last video) is, if you look towards the end of my video I added 2 small pieces of magnets on the ends of the center core and it helped a little, so basically I used this same model but added 1 inch N52 cube magnets on those ends and got 520g of pull instead of the 250g. So as you can see it's all about the strength of the magnets that will make a stronger pull force. I'm sure a design with more coil and core surface area will also boost things.

However, one important thing is the generator effect. The stronger the magnets the stronger the fight with the generator effect is (Lenz Law) This is what I'm more interested in finding, is a way we can use the Lenz effect to our advantage.

Luc

[telecom]

Hi telecom,

I think it would be more like 1/4 of a second to travel 1 cm in the modified version.

All I did to double the pull force (from last video) is, if you look towards the end of my video I added 2 small pieces of magnets on the ends of the center core and it helped a little, so basically I used this same model but added 1 inch N52 cube magnets on those ends and got 520g of pull instead of the 250g. So as you can see it's all about the strength of the magnets that will make a stronger pull force. I'm sure a design with more coil and core surface area will also boost things.

However, one important thing is the generator effect. The stronger the magnets the stronger the fight with the generator effect is (Lenz Law) This is what I'm more interested in finding, is a way we can use the Lenz effect to our advantage.

Luc

Great,
in this case the equivalent is 750 G.
You are getting closer!

[Khwartz]

That's the problem!  I don't  have an accurate way of calculating such a fast and small amount of time for a movement.

All I can do is do that ca be accurate is a test of Joule energy (capacitive discharge) and measure how high it travels.

Luc

What about a gearing counter or what ever kind, and you let it run for 1 minute? then you could make the ratio and have the average duration with more precision; what do you think?

[gotoluc]

Just thought of this ... if I video tape the movement, we know NTSC video has 29.97 frames per second, so I think that should be accurate enough.

However, to get an accurate coil movement I would have to build a sliding guide system so the core doesn't loose power rubbing on the center core like it is now.

Unfortunately I'll have to put this on the back burner as the weather is great at this time for my houseboat building project: http://www.overunity.com/13496/building-a-solar-electric-houseboat/msg360011/#msg360011

Luc