mboucher
you are lucky. Mars motors with traditional brush systems can be
operated freely in both directions.
Instead these "pancake" type motors are tricky: You may adjust the
advance for both directions, but the unsymmetrical brushes may wear out
rapidly in reverse if large voltages and powers are needed.
What is CW of pancakes: It is unfortunately exactly "the wrong
direction", if you take a noutboard motor rig and replace the gas engine!
cheers,
reino urala
On 11/06/2010 09:28 PM, mboucher99 wrote:
> Thanks for responding.
>
> It is belt-driven. We have a MARS 48v, with 2:1 pulley reduction with dual belts from the big pulley to the small pulley on the motor shaft.
>
> Unless the Sevcon PMAC is set up differently for forward vs. reverse, I don't see why the motor would care which way it's spinning. I just want to be sure i'm not going to damage anything.
>
> Michael
>
>
>
> --- In electricboats@yahoogroups.com, Bill Spires<spiresac@...> wrote:
>
>> What is your set up? Is there a thrust bearing to consider or is the motor belt
>> driven to a shaft?
>>
>>
>>
>> ________________________________
>> From: mboucher99<mboucher99@...>
>> To: electricboats@yahoogroups.com
>> Sent: Sat, November 6, 2010 9:54:38 AM
>> Subject: [Electric Boats] propeller direction
>>
>>
>> here's one for you all. i am about to upgrade our 2-blade, 12" dia x 5 (?) pitch
>> prop with a 12 x 13" or 14, as has been recommended by several of you. any other
>> thoughts? the boat is a 27' sloop. the current setup does fine in normal
>> conditions, but is weak in strong currents.
>>
>>
>> today's question: does it really matter with an electric motor whether i buy a R
>> or L direction prop? forward is currently a left-hand twist, but the setup runs
>> more smoothly and quietly spinning left. can't i simply reverse my switch and
>> have it be a left-hand setup, or are there other considerations - motor - PMAC
>> controller - that i am not considering.
>>
>> thanks! (again)
>>
>>
>
>
>
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