Quote from: Scorch on December 23, 2012, 05:48:59 PM
12/23/12

Completed some more fabrication this weekend.

Built a new rotor with significantly less wobble and stronger magnets.
Replaced the terminal blocks in favor of flat bottom terminal blocks which work better with mounting tape.

And fabricated a new timing disk.
The plan is to just use the original hall circuit, as per beginning of this thread, but will have the ability to adjust timing while running and can also try different sized magnets in different timing disks to change parameters such as "on time".

But; I am wondering, short of upgrading to an Arduino controller, and trying to keep it as simple as possible, isn't it possible to add a "time delay" to the TIP42C in order to change 'on' time? Needs to stay simple such as a capacitor and potentiometer or some such thing.

PS: Timing magnets are 1/8" diameter X 1/8" high in this particular disk.
Which is just another 1/4" Thick X 4" Diameter acrylic disk with 1/2" hub.

}:>

Hi scorch,


If you want to adjust on time with a hall sensor, and stay simple, the magnets on your timing disk will dictate your on & off time, if your magnets are short or small you will have short on time, if your magnets are long or bigger, your on time will be longer, thats why romero used the magnets on the rotor for the first motor coil for longer pulse and he used the small magnets on the side for the second motor coil for short pulse....


Regards and a happy holidays to all....
Cc

This; I am already aware of.
But wish this could be adjusted, on the fly, with a simple turn of a potentiometer shaft or swap a capacitor.
I will, more than likely, upgrade to an arduino controller eventually.

This because this is a dynamic system.
Even if I do manage to discover a resonating 'sweet spot'; this may change under different load conditions, rpm, and even environmental conditions such as temperature.
And may want to automatically change pulse width or 'advance timing' directly proportional to rpm. . .

Can an arduino be programed for inversely proportional pulse width, and/or timing based, on RPM?
IE: Twice the rpm = 4 times as much advance and/or 4 times less pulse width etc.

I imagine a system, if working properly, should NOT increase RPM under load but, merely, use less energy from a battery as it uses more energy from the vacuum.

}:>

Quote from: crazycut06 on December 24, 2012, 01:09:58 AM

Hi scorch,


If you want to adjust on time with a hall sensor, and stay simple, the magnets on your timing disk will dictate your on & off time, if your magnets are short or small you will have short on time, if your magnets are long or bigger, your on time will be longer, thats why romero used the magnets on the rotor for the first motor coil for longer pulse and he used the small magnets on the side for the second motor coil for short pulse....


Regards and a happy holidays to all....
Cc

oh, geez, I penned: "simple"
1-3 components into existing hall circuit.

If I am going to build something like those; I might as well just buy an arduino controller. . .

}:>

Quote from: T-1000 on December 23, 2012, 10:08:04 PM
You might check on Time Delay Circuits in http://home.cogeco.ca/~rpaisley4/Comparators.html for ideas

Well if you really want to do a more fine adjustments, Check out quanta magetics pulse motor controller, maybe it will suit your needs...


Happy experimenting! 

Quote from: Scorch on December 24, 2012, 11:25:45 AM
oh, geez, I penned: "simple"
1-3 components into existing hall circuit.

If I am going to build something like those; I might as well just buy an arduino controller. . .

}:>

If you are going to build al thos on transistors it will be almost like simple microchip
Also you can still have single transistor with capacitor and resitor to do delay line.


Merry Christmas everyone! http://www.youtube.com/watch?v=ouMBcIN4MoQ