Any ideas for large motor, and electronics

If you had two 12 volt large batts and this..

ebay item 7560574579

you could power a 3hp single phase 240 volt motor

all the best,....mark

Reply to
mark
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And alot of money :-)

Thanks for all the comments

It's interesting: you talk to the boat people, they suggest 12V troller motors, talk to model engineers, they suggest 3 phase motors, talk to robotic engineers they talk about using somekind of scooter/electric wheel chair, talk to model submariners they suggest motors for bikes. There is no common source shard by any of them. So I have decided why not add another possilbility of my own?

10 1/4Hp motors, all sharing same shaft. To control, step the voltage up/down. So have 8 6V batteries, them connect them in such a way, so that the draw on each battery is the same. Very cheap, and should work. And no complex controllers to interface. Only problem is that isn't that efficient.

Michael

Reply to
Michael

..oi gerr orf I've got that on my watch list !

Andrew

Reply to
Andrew Mawson

Very interesting..... How do you think an American 240 / 110 V dual voltage input inverter would take to a DC supply ? I have run inverters of this type of a 110 V supply from a sight transformer, but I don't know how they get their 230 V output when they are working off the 110 V ac supply.

Reply to
Jonathan Barnes

??? I seem to recall that motors don't like running of inverter outputs. What are you planning to do with this unit ?

Reply to
Jonathan Barnes

outputs.

Jonathan,

I happen to have a large24v battery set in my Harbuilt flat bed trolley, and it occured to me that that unit would make a nice short term standby for the house as it looks as though the government is slowly walking us into a bleak winter with power cuts threatening. 3Kw is more than than enough for domestic (bar cooking) load for the odd couple of hours - in fact with everything reduce to standby load is abot 750 watts (I continuously monitor power usage!!)

AWEM

Reply to
Andrew Mawson

The switch-mode PSUs used for computers that run off 90-250V used to have an automatic switchover circuit that optionally used a diode voltage-doubler when running on lower voltages. This would be more difficult for the higher currents drawn by inverters but might be practical.

-adrian

Reply to
Adrian Godwin

I suspect that they will not appreciate dc straight up'em. Almost certainly they will use some sort of voltage doubler to get enough dc volts to produce

230 three phase with only 110vac coming in. One could make 220v squarewave with some FETs and a 110vdc source which should work such an inverter ok.

Bob

Reply to
Bob Minchin

How about looking at a different technology. Would a Stirling Engin do?

Or get totally creative, High Test Peroxide running a steam turbine! Don't know if you can get the fuel though.

I suppose you could use bottled air and a small converted steam set. Even if the model weighed 200Kg you still have 300Kg for compressed ai and bottles.

At a pinch you could build a monofuel motor, like a glowplug running o gunpowder! I have seen a little impact version which was driven by roll of caps, and you still have to get the exhaust out of the boat.

Just some off the wall ideas!

Regards Robi

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Reply to
rsss

As it is a scale model, i'd like to stick with electric motor and prop.

Michael

Reply to
Michael

Sorry to clutter up the group with a semi commercial message but a direct email yielded the following response:-

Final-Recipient: rfc822; snipped-for-privacy@Qblueyonder.co.uk Action: failed Status: 5.0.0 Diagnostic-Code: X-SMTP-Server; Host or domain name not found. Name service error for name=Qblueyonder.co.uk type=A: Host not found

Message

Low voltage 3HP DC motors are pretty rare beasts but I have four ex US army permanent magnet 36V 2Hp motors - one or a pair of these would be a reasonable solution.

Nameplate data

Leeson Electric Co Grafton Wisconsin Permanent magnet motor

2HP continuous rating 36V DC 49A 3,350 RPM

5 1/2" diameter x 11" long 14Kg(30lbs)

The output shaft is 15mm diameter recessed inside a 42mm diameter recess.

The shaft is hardened and tempered and provided with a 1/4" x1/4" driving slot suitable for driving an Oldham type coupling.

A possible simple speed control system is a stack of 6V batteries with voltage selected by diode isolated contactors.

Jim

Reply to
pentagrid

Jim,

Remove the Qs: michae snipped-for-privacy@blueyonder.co.uk

I'm interested, could you contact me directly regarding a price?

Thanks

Reply to
Michael

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