3 Phase Motors Speed Control

[Jamie3032]

Hi, Does anybody know of any alternative to governing the speed of a 3 phase motor than a frequency inverter? Thanks in advance, Jamie

 

[Knobhead]

Yes, see my avatar

 

[i=p/u]

extra magnets

 

[Silly Sausage]

I was thinking of a very strong pair of gloves.

 

[Knobhead]

And lots of other ways.

Ask a reasonable question you could get a reasonable answer.

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I was thinking of a very strong pair of gloves.

Railway sleeper works well.

 

[i=p/u]

so does not oiling it 'aaaaaaaa tony

 

[Silly Sausage]

Railway sleeper works well.

With the Man sized motors you're probably used to!

 

[i=p/u]

men and motors

 

[Jamie3032]

I guess if it doesnt involve T+E you fellas are banging your head against the wall, thanks for the comedic replies though, just amazing....

 

[clematis432]

I guess if it doesnt involve T+E you fellas are banging your head against the wall, thanks for the comedic replies though, just amazing....

If it,s a "bog standard" asynchronous induction motor (most common 3-phase motor) your meaning, a frequency converter is the only practical method. There is other more specialist 3 phase motors that can be controlled by other means but these are not very commonly used. Frequency converters are by far the most common way of controlling the speed of an AC 3 phase motor.
Noticed you got some really,really funny replies. Lol

 

[Jamie3032]

If it,s a "bog standard" asynchronous induction motor (most common 3-phase motor) your meaning, a frequency converter is the only practical method. There is other more specialist 3 phase motors that can be controlled by other means but these are not very commonly used. Frequency converters are by far the most common way of controlling the speed of an AC 3 phase motor.

Thanks, yes this is what I thought was the case, i am thinking that the frequency inverter can be controlled via a panel mounted potentiometer

 

[westmac]

You can control them via a potentiometer yes but depending on the make/model you can get a range of operator panels to give them better control and feedback on key parameters. Is the motor existing or to be sourced?

 

[Jamie3032]

You can control them via a potentiometer yes but depending on the make/model you can get a range of operator panels to give them better control and feedback on key parameters. Is the motor existing or to be sourced?

The motor is already in place D.O.L. , the budget is the main issue here, I wouldnt think that there will be any need for feedback or any kind of ramping up/down of speeds, just a means of governing the speed of the bandsaw blade for cutting different materials

 

[SibertSolar]

How about an IMO Jaguar drive? No upfront cost, payback/finance model is quite interesting. Perfect for DOL/single speed motors that are running faster than they need to.

 

[clematis432]

Thanks, yes this is what I thought was the case, i am thinking that the frequency inverter can be controlled via a panel mounted potentiometer

Yes it can easily be controlled via a potentiometer and since the motor you want to speed control seems pretty small, and budget is important to you, I would think it would not cost more than a couple of hundred pounds to source a suitable VSD.

 

[Jamie3032]

Yes it can easily be controlled via a potentiometer and since the motor you want to speed control seems pretty small, it would not cost more than a couple of hundred pounds to source/install

Thanks for all the advice, do you have any recommendations for a frequency inverter to use for this application @ 1.1KW

 

[westmac]

It depends on the reputation/support you want from the manufacturer. We use both ABB and Danfoss inverters depending on the customer.

 

[Jamie3032]

Yes, I have had some involvement with both ABB and mitsubishi AC Inverters, as this job is on a tight budget I was hoping that somebody may have a cost effective solution with regards to a cheap no frills inverter, thanks again

 

[Knobhead]

The motor is already in place D.O.L. , the budget is the main issue here, I wouldnt think that there will be any need for feedback or any kind of ramping up/down of speeds, just a means of governing the speed of the bandsaw blade for cutting different materials

Hold it right there!

Have you spoken to the manufacturers about this. You're entering a legal nightmare.

 

[Marvo]

You could see if one of these would be suitable. I'm not sure if they're any cheaper than a low-end inverter drive though.