Mostly Permanent Magnet Motor with minimal Input Power

[Magluvin]

..... The CA is just like resin, its not real strong unless its with fiber, what ever it may be.


Mags

Glass fiber, carbon fiber, 16awg wire.    lol   All that wire glued solid, would be a copper brick. No glass needed. 

Mags

[gotoluc]

Thanks guys

I'll look into it Mags but epoxy and cloth is not a big deal for me as I'm building a houseboat, so I've got lots.

Yep, a real monster of a coil!... first one this big and heavy I've ever built. Must be over 5 pounds. If this design has any value it would be worth making the coils with copper clad aluminum wire to save on weight.

Luc

[wattsup]

@gotoluc

Great job - why no center taps?

wattsup

[Khwartz]

The torque of an electric motor is measured exactly as i did it.We are measuring static rotor torque.Torque is a measure of rotational or "twisting" force. I can dig up my torque dial if you like,and show you that the results will be exactly the same for the P/in we used.

Dear Brad, there are 3 distincts concepts here:

1. "Shaft torque",

2. "Rotor torque",

3. "Moment", or just "torque",

and as more we differenciate the concepts more we allow us to be accurate and so not leading to misinterpretations, so wastes of time, good to clear up the differences in between. So,

• "Shaft torque" is about twisting the axis,

• "Rotor torque" is about the reaction of the fluid against the rotation of the rotor (like for helicopters rotors),

•  "Moment" is "the rotational force times meter" reduced to the center of rotation when there is rotation of course (which is on the axis necessarily). This moment corresponds to "torque" when nothing is specified.

So yes, indeed, your way to measure the "torque" (definition 3) is absolutely correct but not your way to interpret it. YOU DO NOT MEASURE "TORQUE" BY YOUR READING ON YOUR PONY-BRAKE, YOU ONLY MEASURE THE "ROTATIONAL FORCE" (or "TANGENTIAL FORCE") AT A SPECIFIC RADIUS.

To get the "torque", or "moment", YOU DO NEED THEN TO MULTIPLY IT BY THE LENGH IN METERS. (To have directly the reading on the pony-brake you would need to set a 1 meter radius disk, not just been 1:1 with the radius of the rotor ^_^).

For more details about these concepts see for example:

http://books.google.fr/books?id=FiEapaNgjLcC&pg=PA423&lpg=PA423&dq=%22rotor+torque%22+definition&source=bl&ots=NIXpY_U_yw&sig=JH7FFM3jvQLjFDj6Z2aMOnjEfjY&hl=fr&sa=X&ei=wmj9U5z5LoHtaL7fgtAO&ved=0CCsQ6AEwBzgK


http://www.physicsforums.com/showthread.php?t=571073

Otherwise, still your idea of torque measurements and comparisons looks to me most relevant in the case of the Luc's MMM

Regards,
Didier.

[Khwartz]

How can be they so great if voltage varies and there is always a small charge remaining?

Hi telecom, needn't we just the difference of voltage between the start of the experiment and the end? as per:

W [Joule] = 0.5 × C [F] × (E1[Volts] - E2 [Volts])^2

Isn't the variations in between not relevant?