The Ossie motor

[Jimboot]

@woopy btw mate I think you are doing sensational work. I don't understand it yet tho You're encouraging me to test a Hall sensor tho. Did you ever build Ossies' SS switching circuit? I'll be interested to know your thoughts on Futuristic''s analysis of the activation as well.

[woopy]

all

have a good but short night because Olympic game.

This morning i redo the test to be sure of the 2 ma current draw.

here 4 pix to explain what i see.

the pix had been made one after another to be sure we speak of the same thing.

pix 1 is the ampmeter 2.1 average ma  it varies slightly between 2 an2.2 ma  probably due to slight wobling of the rotor or perhaps inequal magnetisation of the magnets. The minus value is only due to  inversion of the connection nothing relevant.

pix 2 is the trace at 2.1 ma almost the same as the one from yesterday.

pix 3 to answer Futuristc question i hooked the probe to the coils and they fire all and regular. When it happens that one coil is not fired the trace is a smooth AC trace

pix 4 is my study of the trace (pix 2) above. As Cp think , i think  the two first peak are zeroing each other and there is only the green triangle as pulse current . And the calculation (Thanks Gyula) shows that
        this correspond roughly to 2.11 ma .

But on pix 4 i would like an explanation of those red and blue peak. Are they gain and lost ? are they braking the rotor etc.. ? What do you think ?

regards

Laurent

[futuristic]

Hi, thank you for clearing some things up.

Just a question. I see from the screenshot that you have two channel scope. Why don't you measure both voltages at the same time?

If you did your scope shot would be like this:

[woopy]

Thanks Frenky

I am far from being an expert and i need you to improve my knowledge.

I hooked the main probe of canal 2 between the battery positive and the resistor (1 ohm wrapped with red tape to easily recognise it )  and i got a sister image of canal 1(pix 2)

but as soon as i try to connect the second probe on the other side of the resistor there is a short cut the amps jumps away and the motor stops. This is not the first time that something like this happens when i try to use canal 2.

So please where is the right place to connect the second scope probe (clip that i hold in my fingers) ?

Thanks

Laurent

[Jimboot]

Hi Guys, Hadn't tried my 12VDC SLA in a while on the old rig.
The battery is steadily charging. How long this last I'm not sure. If it keeps going up it will probably melt my reeds but I'll let her run.