[PSUBS-MAILIST] Alan needs a motor
Hugh Fulton via Personal_Submersibles
personal_submersibles at psubs.org
Thu Oct 30 20:28:00 EDT 2014
No what revs is the small motor you found. You said it was very high.
Hugh
From: Personal_Submersibles [mailto:personal_submersibles-bounces at psubs.org] On Behalf Of Alan James via Personal_Submersibles
Sent: Friday, 31 October 2014 1:07 p.m.
To: Personal Submersibles General Discussion
Subject: Re: [PSUBS-MAILIST] Alan needs a motor
Hi Hugh,
I'm looking for something under 3000rpm straight from the motor
without a gear box.
Why 3000rpm? Mainly because that seems to be the maximum that the professional
thruster manufacturers go to; also some other reading I have done indicated that
that was at the high end.
Alan
_____
From: Hugh Fulton via Personal_Submersibles <personal_submersibles at psubs.org>
To: 'Personal Submersibles General Discussion' <personal_submersibles at psubs.org>
Sent: Friday, October 31, 2014 1:00 PM
Subject: Re: [PSUBS-MAILIST] Alan needs a motor
Alan
What revs?
Hugh
From: Personal_Submersibles [mailto:personal_submersibles-bounces at psubs.org] On Behalf Of Alan James via Personal_Submersibles
Sent: Friday, 31 October 2014 12:40 p.m.
To: Personal Submersibles General Discussion
Subject: Re: [PSUBS-MAILIST] Alan needs a motor
Hi Brian,
thanks. That one is 15hp & 8" diameter.
The motor I do have is 2hp & 2" diameter but just revs
too fast. Hopefully I will find a solution that doesn't need a gear box.
Alan
_____
From: Brian Cox via Personal_Submersibles <personal_submersibles at psubs.org>
To: Personal Submersibles General Discussion <personal_submersibles at psubs.org>
Sent: Friday, October 31, 2014 12:25 PM
Subject: Re: [PSUBS-MAILIST] Alan needs a motor
What about this one?
http://www.thunderstruck-ev.com/motenergy-me0909.html
brian
--- personal_submersibles at psubs.org wrote:
From: Alan James via Personal_Submersibles <personal_submersibles at psubs.org>
To: Personal Submersibles General Discussion <personal_submersibles at psubs.org>
Subject: Re: [PSUBS-MAILIST] Alan needs a motor
Date: Thu, 30 Oct 2014 20:22:42 +0000 (UTC)
Thanks Hank & Graham.
I am probably searching for Nirvana here.
First I am set on finding a brushless motor solution.
I spent multiple hours of Googling, focusing on E-bikes, scooters etc.
The E-bikes are mainly hub motors that are narrow with a large diameter, which
is no good as far as drag is concerned, plus you need a big prop to get out beyond
the diameter of the motor. There are units with 5-1 gear box ratios at 48V 1500W
but they can weigh around 14kg. I bought an 1850W Hobby King BLDC outrunner
motor for $56- & it weighs 530 grams. So more powerful & 1/27th the weight.
This does 236 rpm per volt, & from what I've read you don't want to be turning your
prop at more than 3000rpm on a sub. This means I would have to drive this motor with
a maximum of 12V & it's rated for a maximum of 37.
To disipate the heat from the stationary inner coil of an outrunner, I may be forced to
go with oil compensation; which is what most commercial brushless thrusters are anyway.
One solution I can see is to go with a much larger hobby type motor & run it way below
it's maximum voltage to keep the revs down. Also I wouldn't be thrashing the motor
which may help it live a lot longer.
Need to do a lot more study here, then experimentation with motors & props in water.
Alan
P.S. Hank I was given a motorized Golf trundler & converted it to a trike with ape hangers
and pink banana seat for my girls. Boy did they love showing off on that.
_____
From: hank pronk via Personal_Submersibles <personal_submersibles at psubs.org>
To: personal_submersibles at psubs.org
Sent: Friday, October 31, 2014 1:32 AM
Subject: [PSUBS-MAILIST] Alan needs a motor
Alan,
I just went on ebay and found a 1,000 watt 48v brushless motor with controller for 200 dollars. It is for an electric bike. I bought one for my son a few years back and it was amazing. He was driving it all over town and towing his buddy on his skate board. Just type in brushless 48 v motor.
You won't need a gearbox either.
Hank
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