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How to change the single phase motor speed

I

Ink Maker

Jan 1, 1970
0
Hi I am very encouraged by the responses I got for my Siemens VFD
question and would like to thank all the responders.

We have a lab model three roll mill which has a motor rated at 750W,
single phase, 110V, 60Hz. Our customers can plug it into any wall
plug.

Some customers in the past asked for variable speed. What is the best
way to achieve the variable speed in this case?

Thanks,

Ken


Opportunities are never lost. The other fellow takes those you miss.


| Torrey Hills Technologies, LLC |
| www.threerollmill.com |
| www.torreyhillstech.com |
 
J

John Popelish

Jan 1, 1970
0
Ink said:
Hi I am very encouraged by the responses I got for my Siemens VFD
question and would like to thank all the responders.

We have a lab model three roll mill which has a motor rated at 750W,
single phase, 110V, 60Hz. Our customers can plug it into any wall
plug.

Some customers in the past asked for variable speed. What is the best
way to achieve the variable speed in this case?

My first choice would be to replace the motor with a 3 phase
version and add a variable speed drive.

It is possible, in principle, to modify a single phase,
capacitor run motor (remove the capacitor and bring its
winding to the outside) to run variable speed on a 3 phase
drive, with the addition of a transformer to derive the
capacitor winding's phase. I haven't yet done this.
 
M

MooseFET

Jan 1, 1970
0
My first choice would be to replace the motor with a 3 phase
version and add a variable speed drive.

It is possible, in principle, to modify a single phase,
capacitor run motor (remove the capacitor and bring its
winding to the outside) to run variable speed on a 3 phase
drive, with the addition of a transformer to derive the
capacitor winding's phase. I haven't yet done this.


If variable can mean slow, medium or fast, there are motors that do
this by switching windings. Perhaps replacing the motor with one of
these would be good enough.
 

neon

Oct 21, 2006
1,325
Joined
Oct 21, 2006
Messages
1,325
buy a phase variable switch like a triac controller. those things are very cheap.
 
I

Ink Maker

Jan 1, 1970
0
If variable can mean slow, medium or fast, there are motors that do
this by switching windings. Perhaps replacing the motor with one of
these would be good enough.- Hide quoted text -

- Show quoted text -
We manufacture three roll mills. Our lab model comes with only single
phase power supply (750W). Once a while, our customers would ask
variable speed. We have variable speed options on other models that
use 3-phase power (using Siemens VFD).

Last week we got another order from a customer in UK. Normally we ship
our machines to UK with 240V, 50 Hz, 3 Phase motor. To achieve
variable speed, we used VFD. It just happens this week they request
the power supply to be single phase.

A quick search in Wikipedia shows there is single phase VFD too.
http://en.wikipedia.org/wiki/Variable_frequency_drive

Thanks,

Ken

Opportunities are never lost. The other fellow takes those you miss.

| Torrey Hills Technologies, LLC |
| www.threerollmill.com |
| www.torreyhillstech.com |
 
J

John Popelish

Jan 1, 1970
0
Ink said:
We manufacture three roll mills. Our lab model comes with only single
phase power supply (750W). Once a while, our customers would ask
variable speed. We have variable speed options on other models that
use 3-phase power (using Siemens VFD).

Last week we got another order from a customer in UK. Normally we ship
our machines to UK with 240V, 50 Hz, 3 Phase motor. To achieve
variable speed, we used VFD. It just happens this week they request
the power supply to be single phase.

A quick search in Wikipedia shows there is single phase VFD too.
http://en.wikipedia.org/wiki/Variable_frequency_drive

There are lots of 1 KW, 3 phase VSRs that are powered by
single phase input.

For instance:
http://web6.automationdirect.com/ad...GS1_(120_-z-_230_VAC_V-z-Hz_Control)/GS1-21P0
 
J

Jamie

Jan 1, 1970
0
Ink said:
We manufacture three roll mills. Our lab model comes with only single
phase power supply (750W). Once a while, our customers would ask
variable speed. We have variable speed options on other models that
use 3-phase power (using Siemens VFD).

Last week we got another order from a customer in UK. Normally we ship
our machines to UK with 240V, 50 Hz, 3 Phase motor. To achieve
variable speed, we used VFD. It just happens this week they request
the power supply to be single phase.

A quick search in Wikipedia shows there is single phase VFD too.
http://en.wikipedia.org/wiki/Variable_frequency_drive

Thanks,

Ken

Opportunities are never lost. The other fellow takes those you miss.

| Torrey Hills Technologies, LLC |
| www.threerollmill.com |
| www.torreyhillstech.com |
Universal motor?
That runs on AC/DC and you can vary the speed simply by varying the
voltage to it using a cheap DC drive.
 
M

Michael A. Terrell

Jan 1, 1970
0
Jamie said:
Universal motor?
That runs on AC/DC and you can vary the speed simply by varying the
voltage to it using a cheap DC drive.


You must be a shill for Sears-Mart and the over hyped Universal
motors used in their products.

--
Service to my country? Been there, Done that, and I've got my DD214 to
prove it.
Member of DAV #85.

Michael A. Terrell
Central Florida
 
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