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Author Topic: Unusual elec diagram needed  (Read 2012 times)

MartinH-K

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Unusual elec diagram needed
« on: March 25, 2009, 11:55:18 AM »

A suggestion (very clever one actually!) has been made here concerning powering my huge HMS Hood. The suggestion was that I investigate using the electric engines from a mobility scooter...
I have a couple of the engines but I could use some help in cobbling together the circuit diagram to incorporate 12 volt batteries and a general speed/direction controller.
Thanks guys
Martin
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malcolmfrary

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Re: Unusual elec diagram needed
« Reply #1 on: March 25, 2009, 02:35:52 PM »

If the motors are brush types (two wires) then look at
http://www.modelboatmayhem.co.uk/forum/index.php?topic=6169.0
where you will find something to fit.
The only difference between a "normal" setup and yours is that you have larger motors, with a larger current draw.  Once you know what that current is, you can figure out which ESCs you need.
To control the ESCs, either by radio from shore by someone with a sense of humour, or use a servo tester as a control source instead of the radio.
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"With the right tool, you can break anything" - Garfield

MartinH-K

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Re: Unusual elec diagram needed
« Reply #2 on: March 25, 2009, 03:08:59 PM »

Its a manned model- I'm sitting in it. O0
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Arrow5

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Re: Unusual elec diagram needed
« Reply #3 on: March 25, 2009, 03:17:50 PM »

If you find a repair shop for the disability scooters they will maybe have spares and bits`n pieces including the manual controls. I`m on the case, got a place about a hundred miles from here that advertises all sort of things, due a trip soon.  Also found cheaper supply of the makings for crew, will PM when they reply with exact prices.
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MartinH-K

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Re: Unusual elec diagram needed
« Reply #4 on: March 25, 2009, 03:49:23 PM »

Thanks Dunc... The mobility place I checked offered me two engines plus a control (forward/backward knob) for 15.
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andyn

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Re: Unusual elec diagram needed
« Reply #5 on: March 25, 2009, 05:06:44 PM »

How about just a servo connected to the top of the knob with a ball joint?
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funtimefrankie

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Re: Unusual elec diagram needed
« Reply #6 on: March 25, 2009, 05:24:06 PM »

Will these be proportional or just on and off (forward/reverse).
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MartinH-K

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Re: Unusual elec diagram needed
« Reply #7 on: March 25, 2009, 07:08:37 PM »

Need to put a variable resister in the loop to control speed... {:-{
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malcolmfrary

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Re: Unusual elec diagram needed
« Reply #8 on: March 26, 2009, 10:54:56 AM »

Thats why I suggested using ESCs of suitable size with a servo tester as a control.  With that arrangement you do get full proportional control.  The ESC wants a signal from a radio - the tester provides that signal.  It doesn't really care whether its driving a servo, a switcher or an ESC, it just provides a signal that varies in accordance with the knob on the front.
As an alternative, PMK has put a diagram of a suitable unit in his thread at
http://www.modelboatmayhem.co.uk/forum/index.php?topic=16005.0
which he intended as a servo controller, but will be just as good as an ESC controller.
The advantage of using ESCs is that you would be using a standard technology, which is drop-in replaceable should the need arise.
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"With the right tool, you can break anything" - Garfield

FullLeatherJacket

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Re: Unusual elec diagram needed
« Reply #9 on: March 26, 2009, 01:56:14 PM »

This'll do yer; it's built and tested for a tenner.
http://www.action-electronics.co.uk/pdfs/P22.pdf
Not sure about the motors, although one of our customers uses motorised golf-caddy motors ("MOCAD") with a standard ACTion unit.
FLJ
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