Post #22 edited.Post your .asc file.
I am delighted to hear it.Danko,
That seems to achieve what i'm looking for, however we're still filtering Vsense independently.
Good idea.I think the best route is to file this under future research and move forward filtering the Vsense to an acceptable average. The actual current ripple could be helpful in the application.
Inner resistance of voltage source V1 is zero, independent from its voltage. Therefore, when voltage of V1 becomes zero, anode of D2 is connected to ground (kind of cheating).I also don't see how the flyback diode in the image above works connected in series with the power supply?
These voltage pulses are really horrible.I've attached my .asc as well. What I see at Vsense is the voltage jumps up and down, rapidly.
I am trying to simulate an idea, where I can filter the current through a coil, and a sense resistor, so that there isnt any voltage ripple at the sense resistor.Returning to the original post:
What exactly do you want to accomplish with the motor current? Can you post a sketch of what the current waveform looks like and what you would like it to look like? After all the posts, I'm left with the feeling you are trying to accomplish something that simply isn't possible.
Sorry, I wasn't clear.Post #22 edited.
My simulation of your circuit below looks okay.So unless anyone sees anything blatantly bad about this I'll likely build this and see what happens.
I"ll keep playing with simulation and see if i can get anywhere else with filtering the coil.
Sorry, for me it was omnidirected, like voice from Haven.Sorry, I wasn't clear.
I was directing that request to the OP.
I believe I do yes, the R-C filter on the voltage dropped by the sense resistor (Vsense) is charging and dischargin from the capacitor between pullsesTravm, do you understand why the current in crutschow's simulation has the shape it does and what the current waveforms through the transistor and diode would look like? This may give you some clues about why you can't effectively change the motor current waveform.
Incidentally, I don't understand the waveforms versus the numeric values for PULSE and .tran that appear on his schematic.
by Jake Hertz
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