Pulse Motors- Your building them wrong.

[tinman]

Hi Brad, from what I see, I agree that running it your way indeed is more efficient than the conventional way.
You sure that the voltage drop at 2amp is not caused by the 2 amp max control on your power supply? And that you did not had the 2amp max set on the 'without magnet' run? Just wondering.
Do you have a cap on the flyback capture circuit? What is clamping its voltage?
Kind regards,
Steven

Power supply was wound up to 5amps.
I also have a high current 63v 10,000uF cap on the input side of the motor, before the cvr.
The flyback is being sent to a rather flat 18650 cell.


Brad

[tinman]

Hi,
I am not sure what is the radius of this rotor but if you could check the NewtonOmeter (grams of pull x radius) value and then estimate at what rotational speed this pulse still has its kick power (about 10Hz maybe?).
So power should be (rotational speed) x (grams pull x radius) = (mech power)
(400 rpm) x (300g x 5cm) = mech power rotor. (Just an example of calculation idea)
Question is what would be pulse duration of 2A@10V ?

Not sure how you could achieve this with a pulse motor, as the grams of pull force is not a constant.
The pull force would have to be averaged over the degrees of measurements taken, then in my case times 4, as i have 4 torque plates.
The running pull force would be less than the static tests carried out.


Brad

[Thaelin]

  This is not really about the motor per se, but I tried to use a group of 18650's to capture the flyback and had a fire. Damn glad I had a pan close to dump it in and get outside so it could finish. For safety, use a resistor or such. Hate to see you go my route.
   About the motor, seems that a fair weight rotor and at least 4 plates is needed to run fair. Did a small test with a cutoff wheel and one plate between a 1/2" mag and a coil of 200 turns on a soft bolt with the head cut off. Not as hard to remove as I thought it would be. Sooooooo, Guess I need to break out the old cutting boards with setups for 1/2" shaft and make a rotor to get setup with.  The chase is on.
thay

[tinman]

  This is not really about the motor per se, but I tried to use a group of 18650's to capture the flyback and had a fire. Damn glad I had a pan close to dump it in and get outside so it could finish. For safety, use a resistor or such. Hate to see you go my route.
   About the motor, seems that a fair weight rotor and at least 4 plates is needed to run fair. Did a small test with a cutoff wheel and one plate between a 1/2" mag and a coil of 200 turns on a soft bolt with the head cut off. Not as hard to remove as I thought it would be. Sooooooo, Guess I need to break out the old cutting boards with setups for 1/2" shaft and make a rotor to get setup with.  The chase is on.
thay

I would say you over charged the battery.
Any higher than 4.4 volts for an 18650 cell, and smoke will come.

[Nali2001]

Did some simulations on the effect of torque plate thicknesses relative to the magnet.
The Plate is just above the gate in this test.
In all the test the gaps between magnet and plate is the same. The colors don't matter, the important value is the Newton on the Y-component. This is the pull force on the plate. There is an optimal plate thickness and it does matter quite a bit it seems.