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Inverter help needed.

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Deko:
A question for all you electronics gents. I have been asked to show my Fibre optic clock at a few events where there is no mains supply. The electrics on the clock consist of two LED drivers (switch mode), and one synchronous (240v) motor. My question is, will a small 12v to 240v inverter cause problems for the motor. As I understand these things the inverter is square wave output, ok for the LED drivers, but would the motor need a sine wave supply ???  Any advice will be most welcome.

Cheers Dek. :med:

Bluechip:
Well, young Deko .... Hmmmm ..

If it's something like this:

https://www.machinemart.co.uk/shop/product/details/010710400?da=1&TC=SRC-inverter

your motor will probably run fine, BUT ... one I played with [ not from MM but could well be a generic item ] the frequency is only somewhat 50Hz which is probably what you want ??

If it's pseudo-sine there will be harmonics which may well cause the laminations to sing a bit ?

If you look at the devices suggested for running off the inverter, they are all things which won't mind if the 50Hz isn't too accurate.

I once changed a Shuko[?]  socket for a 13A UK on one and it was scoped at close to 68Hz ...   :palm:

Once more it was not supplied by MM. :thumbup:

Dave

Edit .   Sorry, should be Schuko ...

http://en.wikipedia.org/wiki/Schuko

Deko:
Thanks for the info Dave. Obviously it is the frequency that in this case determines the motor speed so if as you say it were to be 68hz rather than 50hz then the clock would be running very fast.

For the short time it would be on display this would not really be too much of a problem. What worries me is would it damage the motor in ANY way.

I bought the motor new about 10 years ago, when it came to final assembly of the clock I thought I would buy another the same, only to discover that they stopped making that model some years ago.

To fit an alternative motor would mean an almost complete rework of the clock, so as you can see it is a major concern

Cheers Dek. :med:

Bluechip:
What motor is it ???

I have a vision of a geared motor, bit like the uwave turntable motor ??

Dave

Deko:
I haven't time to do it now, but I will scan the info sheet and post tomorrow.  Thanks again Dave.

Cheers Dek.

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