[PSUBS-MAILIST] Alan needs a motor

Thu Oct 30 23:01:05 EDT 2014

Hi Pete,I have been looking at frameless brushless motors, but convertinga brushed motor to a brushless would be huge (for me) if that iswhat you mean. Also one of the attractions of the brushless motorsI've looked at, is the power to size ratio. The little motor I have is 2" diameter X 3.5" long & weighs 788gms for 1850W, which is more powerful than a MinnKotta 101Alan
      From: Pete Niedermayr via Personal_Submersibles <personal_submersibles at psubs.org>
 To: Personal Submersibles General Discussion <personal_submersibles at psubs.org> 
 Sent: Friday, October 31, 2014 3:22 PM
 Subject: Re: [PSUBS-MAILIST] Alan needs a motor

Why not buy a Minnkota or like and use the motor part ?

Pete
--------------------------------------------
On Thu, 10/30/14, Hugh Fulton via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

 Subject: Re: [PSUBS-MAILIST] Alan needs a motor
 To: "'Personal Submersibles General Discussion'" <personal_submersibles at psubs.org>
 Date: Thursday, October 30, 2014, 7:28 PM

 #yiv9915414630
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 #yiv9915414630 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
 motorwithout a
 gear box.Why 3000rpm?
 Mainly because that seems to be the maximum that the
 professionalthruster
 manufacturers go to; also some other reading I have done
 indicated thatthat 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
  AlanWhat
 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
 revstoo 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,
 whichis no good as
 far as drag is concerned, plus you need a big prop to get
 out beyondthe diameter
 of the motor. There are units with 5-1 gear box ratios at
 48V 1500Wbut they can
 weigh around 14kg. I bought an 1850W Hobby King BLDC
 outrunnermotor 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 yourprop 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 togo 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 belowit's
 maximum voltage to keep the revs down. Also I wouldn't
 be thrashing the motorwhich may
 help it live a lot
 longer.Need to do a
 lot more study here, then experimentation with motors &
 props in water.AlanP.S. Hank I
 was given a motorized Golf trundler & converted it to a
 trike with ape hangersand 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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