Any ideas for large motor, and electronics

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

Andrew

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.

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

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

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

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

Bob

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

-- rss

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

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

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

Jim,

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

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

Thanks