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Discussion Starter #1
I'm getting a little fireworks display coming from the brushes of the 8"
ADC motor.
It starts to occur once the motor voltage goes above 72v.
This can't be normal, it isn't just some sparks, its a real cackle and
light show.
I didn't see this kind of thing with my other 8" motor from the Aspire.
What can be the cause? Motor timing? Comm out-of-round?
Jack

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Discussion Starter #2
Hey Jack

If you can send me pics I'll take a look at it for
you.
Hope this helps
Cya
Jim Husted
Hi-Torque Electric


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Discussion Starter #4
Are you running the motor with no load on it? I gather that you are because
you can't load the motor at 72 volts without running the car and you
probably
can't observe the brushes with the car in motion. At 72 volts and no load
the
motor rpm is dangerously high and the motor might explode.

Keep your face and especially your eyes away from any electrical device that
is
emitting loud noises and light flashes.
----- Original Message -----
From: "Jack Murray" <[email protected]>
To: <[email protected]>
Sent: Friday, October 19, 2007 2:56 PM
Subject: [EVDL] Motor Snap Krackle and Pop


> I'm getting a little fireworks display coming from the brushes of the 8"
> ADC motor.
> It starts to occur once the motor voltage goes above 72v.
> This can't be normal, it isn't just some sparks, its a real cackle and
> light show.
> I didn't see this kind of thing with my other 8" motor from the Aspire.
> What can be the cause? Motor timing? Comm out-of-round?
> Jack
>
> _______________________________________________
> For subscription options, see
> http://lists.sjsu.edu/mailman/listinfo/ev
>


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Discussion Starter #5
I'm spinning it counter-clockwise when facing the
output shaft end. There are three holes for the brush
end-bell, it is set to the middle holes. I had asked
before about the holes and was told the middle hole
was neutral the other two were advanced and retarded.

I hooked up my rpm sensor and think that I'm
over-reving it.

Jack

--- Bill Dube <[email protected]> wrote:

> Which way are you spinning it?
>
> Looking at the shaft end, you should be
> spinning it
> counter-clockwise.
>
> If you are spinning it the other way, you
> need to alter the
> brush timing to do so. (Otherwise you will get
> sparks.)
>
> Also, you might want to take a peek to see
> what the brush
> timing is set to. There are typically two sets of
> holes used to hold
> on the brush-end end-bell. For normal rotation, the
> bolts should be
> in the most CCW holes (looking from the brush end.)
>
> Bill Dube'
>
> At 03:56 PM 10/19/2007, you wrote:
> >I'm getting a little fireworks display coming from
> the brushes of the 8"
> >ADC motor.
> >It starts to occur once the motor voltage goes
> above 72v.
> >This can't be normal, it isn't just some sparks,
> its a real cackle and
> >light show.
> >I didn't see this kind of thing with my other 8"
> motor from the Aspire.
> >What can be the cause? Motor timing? Comm
> out-of-round?
> >Jack
> >
> >_______________________________________________
> >For subscription options, see
> >http://lists.sjsu.edu/mailman/listinfo/ev
>
> _______________________________________________
> For subscription options, see
> http://lists.sjsu.edu/mailman/listinfo/ev
>

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Discussion Starter #6
The motor is in the car, but the wheels are off the
ground, transmission in 3rd, so some load, but not
much.
I think you are right about over-reving it.

I installed my rpm sensor. There are two magnets on
the motor, so two ticks per revolution.
When hooking it up to a HZ reading on a multimeter,
I can run it up to over 200HZ without a problem, I
didn't run it higher since I think 233HZ would be 7000
rpm, can someone check my math?
7000 rpm is 14000 ticks per 60 seconds, which is 233
ticks per 1 second or 233Hz, right?
Jack

--- Tom Shay <[email protected]> wrote:

> Are you running the motor with no load on it? I
> gather that you are because
> you can't load the motor at 72 volts without running
> the car and you
> probably
> can't observe the brushes with the car in motion.
> At 72 volts and no load
> the
> motor rpm is dangerously high and the motor might
> explode.
>
> Keep your face and especially your eyes away from
> any electrical device that
> is
> emitting loud noises and light flashes.
> ----- Original Message -----
> From: "Jack Murray" <[email protected]>
> To: <[email protected]>
> Sent: Friday, October 19, 2007 2:56 PM
> Subject: [EVDL] Motor Snap Krackle and Pop
>
>
> > I'm getting a little fireworks display coming from
> the brushes of the 8"
> > ADC motor.
> > It starts to occur once the motor voltage goes
> above 72v.
> > This can't be normal, it isn't just some sparks,
> its a real cackle and
> > light show.
> > I didn't see this kind of thing with my other 8"
> motor from the Aspire.
> > What can be the cause? Motor timing? Comm
> out-of-round?
> > Jack
> >
> > _______________________________________________
> > For subscription options, see
> > http://lists.sjsu.edu/mailman/listinfo/ev
> >
>
>
> _______________________________________________
> For subscription options, see
> http://lists.sjsu.edu/mailman/listinfo/ev
>

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Discussion Starter #7
Correct, every 33 Hz is another 1000 RPM with 2 magnets on
the RPM sensor (multiply by 30 to get per minute)
so 200Hz is 6000 RPM
233Hz is 7000 RPM.
You are lucky your motor did not 'splode at that speed
but I doubt that running it that fast is good for it.
What brush advance did you run it on?

Cor van de Water
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-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of Jack Murray
Sent: Sunday, October 21, 2007 12:47 PM
To: Electric Vehicle Discussion List
Subject: Re: [EVDL] Motor Snap Krackle and Pop

The motor is in the car, but the wheels are off the ground, transmission in 3rd, so some load, but not much.
I think you are right about over-reving it.

I installed my rpm sensor. There are two magnets on the motor, so two ticks per revolution.
When hooking it up to a HZ reading on a multimeter, I can run it up to over 200HZ without a problem, I didn't run it higher since I think 233HZ would be 7000 rpm, can someone check my math?
7000 rpm is 14000 ticks per 60 seconds, which is 233 ticks per 1 second or 233Hz, right?
Jack

--- Tom Shay <[email protected]> wrote:

> Are you running the motor with no load on it? I gather that you are
> because you can't load the motor at 72 volts without running the car
> and you probably can't observe the brushes with the car in motion.
> At 72 volts and no load
> the
> motor rpm is dangerously high and the motor might explode.
>
> Keep your face and especially your eyes away from any electrical
> device that is emitting loud noises and light flashes.
> ----- Original Message -----
> From: "Jack Murray" <[email protected]>
> To: <[email protected]>
> Sent: Friday, October 19, 2007 2:56 PM
> Subject: [EVDL] Motor Snap Krackle and Pop
>
>
> > I'm getting a little fireworks display coming from
> the brushes of the 8"
> > ADC motor.
> > It starts to occur once the motor voltage goes
> above 72v.
> > This can't be normal, it isn't just some sparks,
> its a real cackle and
> > light show.
> > I didn't see this kind of thing with my other 8"
> motor from the Aspire.
> > What can be the cause? Motor timing? Comm
> out-of-round?
> > Jack
> >
> > _______________________________________________
> > For subscription options, see
> > http://lists.sjsu.edu/mailman/listinfo/ev
> >
>
>
> _______________________________________________
> For subscription options, see
> http://lists.sjsu.edu/mailman/listinfo/ev
>

_______________________________________________
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