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Author Topic: What is considered as a pulse motor? (circuits)  (Read 2886 times)

Offline EvilXBOX

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What is considered as a pulse motor? (circuits)
« on: October 18, 2009, 03:05:30 PM »
My design isn't using most of the setups I have read in this area about pulse motors, but I will be pulsing it via a few connectors in the commutation unit to tell me which rotor/stator(using only electromagnets) to send current and high voltage through via a "monostable flipflop" circuit, instead of a hall effect sensor, with some trimmers to adjust how long. What I really wanted was to send one pulse for a specific duration when a button was pushed and not to send another until released and pushed again. From basic calculations it will only be around 1 millisecond since that's about how long it will take to saturate the electromagnets. The other advantage of such a short pulse is that I can start to collect energy for more of the rotational cycle from this rotor/stator again. Since I am thus pulsing the electromagnets is my design considered a pulse motor?

I am also having some issues with simulating (in LTSPICE) gathering and utilizing the Back EMF. basically the voltage is way too high to make it usable, so I have to use a buck converter(dc-dc step down) and the volts/amps that come out of that are way less than what is coming out of the inductor's Back EMF, both current and voltage are lower, I'd like voltage to be lower, to around 12v, but the current should raise but instead it is falling. I know how a buck converter works, and I have several simulations of it working with transistors(IGBT), just never from Back EMF. I think that the problem may be the example load, modeled as a resistor, since when changed the volts and current change based on V=IR..but some values seem to increase both of them sometimes...any idea on how to change this high voltage and low current to lower voltage and high current while keeping all of hte energy stored in the electromagnets based on E=1/2*L*I^2

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Offline EvilXBOX

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Re: What is considered as a pulse motor? (circuits)
« Reply #1 on: November 05, 2009, 09:49:05 PM »
Here is an example of a monostable flipflop circuit. There is only one pulse for ea time it is triggered, there needs to be an off time for the capacitor to recharge, otherwise you wont get a full discharge, if you let go of the trigger in the middle of the pulse then the pulse stops, so I might need to have a debounce, a simple shottky diode right before the NPN driving the LED seems to work... I have also experimented with a pulse lasting longer than when the trigger is pushed, this could be used for recharging, simply connect the output back to the trigger...
R5, R6, and R7 are trimmers/potentiometers, the larger this value(and/or the capacitor) then the longer the pulse, right now it is set to about 15ms, if I take the pots down to zero then I get roughly 1ms...this is only an example, as it takes roughly 100us, so 0.1ms to induce a fully saturated field on my inductor(about 20k ohm and @ 1kv, yields about 50mA)

So given that I am thus pulsing the motor, is it considered a pulse motor?

 

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