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jan_de_jong(at)casema.nl
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 Posted: Wed Apr 26, 2017 12:32 pm Post subject: Interesting thread on overvoltage event |
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Yes, thanks.
Told myself something wrong once and believed it ever after.
Jan de Jong
On 4/15/2017 2:38 PM, MMiller wrote:
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<mmill(at)optonline.net> In a PM generator like the Rotax, frequency is
not a function of the number of coils in the stator, it's a function
of the number of magnets in the rotor divided by two. Divided by two
because the magnets are installed in the rotor with the poles
alternating. Just look at the flux lines of one circuit. Two magnets
in series inducing a field through the laminated stator of two coils.
The two coils are connected in series with one of the coils "crossed"
so the magnetic effect is additive.
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jan_de_jong(at)casema.nl
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| Posted: Thu Apr 27, 2017 12:49 pm Post subject: Interesting thread on overvoltage event |
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Bob, thanks a lot for the little experiment.
No descending into weeds necessary then.
Jan de Jong
| Quote: | In the mean time, I subjected a fully charged ETX36 lithium battery to a 40v, 15A constant current source.
Didn't take time to record and plot the data but my suspicions were correct, these batteries WILL grunt some level of over-charge current.
In this experiment, it took several seconds for battery voltage to rise above 16.0 volts. Risks to accessories in an airplane fitted with a PM (read small) alternator and legacy ov protection (16.2v) are small. Indeed, if the system loads are a significant fraction of the alternators maximum output, one might well never trip a legacy ov protection system.
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