Need more HELP with understanding Inverters

[Luke]

a 415V inverter only changes the Hz of a 415V supply

not true. voltage too.

It will maintain the correct V/f ratio for the motor (as entered as motor data in the inverter).

 

[piman]

Hello MK,

there are 1ph to 3ph 415v output inverters available, see here:-

www.drivesdirect.co.uk/Products/Digital_Inverters240_415.htm

Alec

 

[Jaeger_S2k]

Right the mud is clearing (slightly).

So a Dual voltage motor, got that one.

If an inverter input is 220v and output 220 (3ph) that'll do the business?
Like this is in the states and isn't big enough but am I reading this correctly? It's a single to 3ph inverter without transformer. Making it suitable for dual voltage motors!

 

[madkayaker]

Hello MK,

there are 1ph to 3ph 415v output inverters available, see here:-

www.drivesdirect.co.uk/Products/Digital_Inverters240_415.htm

Alec

There an exception to the rule. This is your other option Jager

 

[stormin]

Jaeger,

What are you trying to power that requires a 5hp motor?

 

[madkayaker]

not true. voltage too.

It will maintain the correct V/f ratio for the motor (as entered as motor data in the inverter).

Not really any use for the scenario we are discussing

 

[Jaeger_S2k]

Jaeger,

What are you trying to power that requires a 5hp motor?

This little Baby Clicky Linky

 

[stormin]

It's got a twin pulley, so have you considered running two single phase motors to it, one to each groove?
How about a small petrol or diesel engine, you can get them for a couple of hundred new, cheaper off fleabay. Makes it portable which is always useful.
Toyed with building something similar myself, but went the whole hog and bought a road compressor cheap.

 

[madkayaker]

two motors would probably fight each other

 

[Jaeger_S2k]

It's got a twin pulley, so have you considered running two single phase motors to it, one to each groove?

Would have to use some electronics to sync. Don't want to go that far.

How about a small petrol or diesel engine, you can get them for a couple of hundred new, cheaper off fleabay. Makes it portable which is always useful.

Neighbours are probably not going to love the compressor, without an engine running too, but if I was out-of-the-way it would be a strong contender.

 

[stormin]

two motors would probably fight each other

Think there's an SIP or Sealey compressor about with 2, 3HP single phase motors. They must be on a timed start or one has an overun clutch. It's big money though £8-900 as I remember.

 

[madkayaker]

one must have a clutch or any difference in motor speed will slip belt

 

[Jaeger_S2k]

Right the mud is clearing (slightly).

So a Dual voltage motor, got that one.

If an inverter input is 220v and output 220 (3ph) that'll do the business?
Like this is in the states and isn't big enough but am I reading this correctly? It's a single to 3ph inverter without transformer. Making it suitable for dual voltage motors!

 

[madkayaker]

what about a little steam engine or a bike with long chain

 

[rtbcomp]

Think there's an SIP or Sealey compressor about with 2, 3HP single phase motors. They must be on a timed start or one has an overun clutch. It's big money though £8-900 as I remember.

You're not confusing it with one with two pumps on the same receiver, (like Clarke do) are you?

 

[Drains]

Jaegar - I know exactly how you feel. That cracked me up.

 

[Jaeger_S2k]

 

[stormin]

You're not confusing it with one with two pumps on the same receiver, (like Clarke do) are you?

Yes you're right both motors power seperate pumps on the model I was thinking off.
Still don't see a reason two motors reasonably well matched couldn't be used to power a single double vee pulley. If there's a slight difference in motor output one will help the other along. If there becomes a greater difference for any reason then the belt would slip slightly but not so much as to cause a real problem.
If he used two 3hp motors they should easily cope with the required 5hp even if one is about down on performance.

 

[Jaeger_S2k]

What about

Right the mud is clearing (slightly).

So a Dual voltage motor, got that one.

If an inverter input is 220v and output 220 (3ph) that'll do the business?
Like this is in the states and isn't big enough but am I reading this correctly? It's a single to 3ph inverter without transformer. Making it suitable for dual voltage motors!

 

[stormin]

What about

Yes that'd do if it was a tiny motor you wanted to power!
Trouble is, like everything else, they get more expensive the more power you want.