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Kiwi_Roy
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PostSubject: Stepper Motor Test   Sun Feb 11, 2018 8:16 pm

I have the tank of at the moment so I thought I would check out the stepper motor.
There are 4 pins on the plug, the 2 outside ones attach to one coil of about 50 Ohms, the inner 2 attach to the other coil of 50 Ohms.
On mine the inner pair were open, so it wouldn't be working, perhaps that explains the fast idle?

I don't think these motors are designed to come apart, I'm fairly certain the motor is glued into the aluminium housing.
With nothing to loose mine was coming apart. The end came off and I was able to get the internal parts out leaving the valve behind.
I found the coil wire was broken right at the solder point but it was too short to re-attach so I pulled the motor apart and re-wound the coil.
I don't like my chances of getting it back together, I will have to motor it to wind the screw back in, It may motor if I just turn the bike on but which way?
It needs to move as though opening the valve, anyone know?

Meanwhile I will see if I can source one.

Looking at the motor/valve construction I really can't see what would be better than a simple flush with carb cleaner, the motor seemed to be well greased, it has a small ball race to take up the thrust, squirting cleaner in any of the 3 ports should be all you need to do, it won't get into the motor.

When I get the new valve I will section this one for your entertainment.


Last edited by Kiwi_Roy on Sun Feb 11, 2018 8:35 pm; edited 1 time in total
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Oz1200Guzzi
Don Abbondio
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PostSubject: Re: Stepper Motor Test   Sun Feb 11, 2018 8:34 pm

Roy,

Being a stepper motor, the probability is that first one coil fires,then the next, repeat. This will make it go in one direction. reversing the sequence will make it go back the other way. You could try 90 or 180 degrees apart to see what happens ( I am thinking 90 degrees). If it doesn't work again, it can be put down to the university of life (I studied there too - might have been asleep during some of the lessons though). The direction maybe critical on the phasing.

From a circuit diagram, A and D are the outside connector pair, with B and C the inner pair, as you say. Without looking at a good one operating with an oscilloscope, it's very hard to tell.

If you need more info on how to do this, let me know and I will try and explain it - do you come from an electrical/electronic background? However, simply firing one coil, then the next fairly quickly, you should be able to determine which way is which, at least to test it. As this does not do a full rotation, it's anyone's guess as to the number of steps needed to go from fully open to fully closed (or visa versa). In normal operation, the stepper would get to its position that the ECU is happy with, and stay there until more command pulses tell it to do something different.
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Kiwi_Roy
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PostSubject: Re: Stepper Motor Test   Sun Feb 11, 2018 8:40 pm

Thanks for the Info, yes I'm a little familiar with how they work but I was thinking I wouldn't be able to switch coils fast enough, any suggestion would be welcome.

Do they reverse the polarity of the coils or simply pulse one then the other, I could do that with a relay and 555 timer?
If I have to change polarity that gets trickier.
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Phang
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PostSubject: Re: Stepper Motor Test   Sun Feb 11, 2018 10:12 pm

this is an i interesting topic, subscribed!
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pauldaytona
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PostSubject: Re: Stepper Motor Test   Sun Feb 11, 2018 10:40 pm

And we need pictures!
For my ecu test bench I got a stepper from a junkyard. Came out of a fiat, and made by marelli, it might be the same as the one in Guzzi's
It looks Ducati uses the same ones as Guzzi:
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I have one like this

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Kiwi_Roy
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PostSubject: Re: Stepper Motor Test   Mon Feb 12, 2018 5:12 am

The markings on the GRiSO unit are Magneti  Mareli on the casting 1B06/00  S0066 on the electrical part.
The Guzzzi part No GU 05135830 has been superceeded
new part No  896540
I believe this is common to a whole range of models, GRiSO 1100, 1200, Breva Norge etc.
They are very spendy so look after it!

The other one you have is only part of a valve.


Last edited by Kiwi_Roy on Wed Feb 14, 2018 5:02 pm; edited 3 times in total
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pauldaytona
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PostSubject: Re: Stepper Motor Test   Mon Feb 12, 2018 2:16 pm

1B06/00 is the part number, the s number must be a week/batch number, not important.

If you can get the part out and in then you can use a ducati part, it could be used in more bikes.
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Oz1200Guzzi
Don Abbondio
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PostSubject: Re: Stepper Motor Test   Mon Feb 12, 2018 2:25 pm

Roy, you could use the 555 to create a pulsed square wave (probably around 25% duty cycle), then a D type flip flop (or even two) with some driver transistors behind to drive the coils.

Drive one from the rising edge, the other from the falling edge of your 555 output.

I would go for something in Hertz range (maximum of 10, but clutching desperately at straws here?). Simply reversing the outputs to the coils "should" reverse direction...

Capice?
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