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Old 07-06-2008, 07:01 PM   #31
TymeRider
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Joined: Apr 2005
Location: Sunnyvale, CA
Oddometer: 378
To resurrect an old thread...
Quote:
Originally Posted by autorotate
Stator measurements....
KEY OFF RESISTENCE MEASUREMENTS
pin1 to pin2= less than .1 ohms
pin2 to pin3= less than .1 ohms
pin1 to pin3= less than .1 ohms
and then
Quote:
Originally Posted by cpmodem
Resistance readings of the stator are sometimes ambiguous. When good they will measure a low resistance. When fried they can read a low resistance also (shorted).
The KTM shop manual gives the following for the stator resistance specifications: Set point value: max 1.0 Ωat 20C

So why is autorotate's measured resistances (and mine on my 950) that different from the spec?

When I measure my stator coils (disconnected, pin1-pin2, pin1-pin3, pin2-pin3), I get readings similar to autorotate's, after letting the DVM readings stabilize for about 10 seconds. When I first connect the DVM the reading are 5-10ohm, and within 2-3 seconds they drop to about 0.5 ohms, and then drop consistently until they are 0.1ohm after about 10 seconds.

I understand this changing value is due to the fact that they are coils and in essence are inductors and so have a voltage drop across each coil that is proportional to the rate of change of the current which screws up the DVM's resistance measurement. But in steady-state (i.e., after 10 seconds) the rate of change of current is zero and the inductive effect will be gone and the measured resistance will be that of the coil. So why is the measured steady-state value (0.1 ohm) so different from the KTM spec (1.0 ohm)?

Anyone else have resistance measurements on their coils? I'm trying to track down some flaky charging behavior.
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Old 11-05-2013, 09:12 PM   #32
fmfpunk
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Location: Koocamonga, CA
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Bump.

Anyone had luck finding a place to rewind a 950 stator?

Thx.
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