Re: [electricboats] Prop rotation

I've been thinking you probably only need one more lesson on your boat before starting to take it pronto your own. Sunday looks as good as any other time.
> On Nov 5, 2020, at 4:11 PM, Matthew Geier <matthew@sleeper.apana.org.au> wrote:
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>> On 6/11/20 2:43 am, Egbert Van popta wrote:
>> No it definitely doesn't matter. The way you mount the throttle defines the way the motor turns in forward or reverse. I have a thunderstruck system too, and although I really love the kit, the technical support was very disappointing to say the least.
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> It does depend on the motor. Certainly DC brushed motors can be tuned for a certain direction of rotation. The Perm 132 motor I have (permanent magnet brushed DC) has the brushes offset slightly from 'neutral' so the motor 'favours' a certain direction. I don't run it at sufficient power for it to have a significant effect (and with my setup the motor is running in reverse most of the time), but if I was running at full rated power in 'reverse' the bushes would arc more and wear faster.
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> The some what larger series DC motors in the trams (streetcars) I work on at a museum have extra coils called 'interpoles' that do some magic to stop the brushes arcing by 'stabilizing' the magnetic fields. The maintenance manager told me some big industrial DC motors had the brushes on a sliding assembly that moved when the motor reversed to keep the brushes at the optimal location with out the need for additional interpole coils.
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> With most motors today being brushless, either 3 phase AC or electronically commutated, this is no longer an issue, but it's not strictly correct to say 'definitely doesn't matter', as for some motor types and power levels, it DOES matter and getting it wrong will impact on the longevity of the brushes and commutator.
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