Controller circuit for Hilden Brandt motor needed..

[JackH]

Later,,,,,JackH

[Honk]

I have already seen pictures on Jack's new motor but I'm equally impressed every time I see it.
It's such a beaut.....

Anyway, I baught 38lb of Non Oriented Silicon steel yesterday. It cost me $116.
Today it will be shipped to a friend of mine to be cut by laser into the desired shape.
I estimate I will recieve the the cut valve pieces sometime next week.
By then I should have received the 12pcs of N45, 40x18x10mm magnets (1.57x0.71x0.39 inch).
http://www.magnesy.eu/mpl-40-x-18-x-10-n45-magnes-neodymowy-p-113.html
This polish magnet supplier have pretty good prices on magnets here in europe.
I will use 4 of those magnets stacked in the valve to a 40x18x40mm magnet (1.57x0.71x1.57 inch).
The coils will be made of 470 turns of 0.8mm copper wire, 40mm long and 9mm deep. 0.8mm = AWG20
The resistance of the coil is calculated to 2.5R. The current at 12W input is 2.19Amp.
I will build three valves to simulate the three phases of the motor and then test the controller on this setup.
Before testing I will match the flux strength of the coil to match the strength of the magnet, just as Jack have told us.

[Humbugger]

@Jack

Whether it works OU or not, sir, you have built a beautiful piece of machine art!

Good luck and please make sure the measurements are done right and the techniques, setup and equipment used are scientifically accurate and clearly reported.  Any machine that looks that robust and handsome deserves equally professional evaluation!

Humbugger

[JackH]

Later,,,,,,JackH

[wattsup]

Very very nice.

Honk and Jack, when testing with those coils, be carefull not to disconnect them while they are energized. I was running an RV system off of an inverter, and while the PM was turning a full speed I wasn't thinking and simply pulled out the motor plug from the inverter. Bang, I fried the inverter. The BEMF just rushed back into the inverter and fried it. So always turn off the power before you disconnect anything. Especially if you only have one circuit. Inverters are a dime a dozen. So please protect the circuit.

Also, I am very very curious how you are handling the BEMF in your controller. Are you simply providing it a clean path to a capacitor or battery at collapse?