Speed controller, 120v motor [Archive]

JES2727

10-13-2006, 07:54 AM

Hello,
I'm seeking suggestions or ideas on ways to automatically control the speed on a small 120 volt motor. I need the motor to ramp up to full speed once the start button is pushed, run at full speed for a pre-determined time period, and ramp down to stop. I have been unable to locate a VFD with a 120v single phase output. There must be other products or methods available to meet my needs.
Thanks for any help...

John

mdshunk

10-13-2006, 08:00 AM

Sure... no problem. The acel and decel are front panel selections on most every VFD. The timed run would be done with your own timer. I use TB Woods drives for the most part, and their E-Trac inverter drives will do 120 volt, no problem. Very decent price point too. http://www.tbwoods.com/products.php?level=4&GID=47&PID=31&MID=

plate

10-13-2006, 10:11 AM

Are you really talking about a 120V induction motor or a universal motor that one may find in a vacuum cleaner or drill?
If you are controlling a universal motor, a DC supply may be the way to go. Also, do you want to be able to control the ramp rate?
What motor hp range are we talking about?

foqnc

10-13-2006, 11:20 AM

Sure... no problem. The acel and decel are front panel selections on most every VFD. The timed run would be done with your own timer. I use TB Woods drives for the most part, and their E-Trac inverter drives will do 120 volt, no problem. Very decent price point too. http://www.tbwoods.com/products.php?level=4&GID=47&PID=31&MID=
Some of the TB Woods VFD we've used are programmable so the external timer would not be needed.

JES2727

10-14-2006, 08:52 AM

Are you really talking about a 120V induction motor or a universal motor that one may find in a vacuum cleaner or drill?
If you are controlling a universal motor, a DC supply may be the way to go. Also, do you want to be able to control the ramp rate?
What motor hp range are we talking about?

Yes, I'm really talking about a 120V induction motor, the kind found in paint shaker machines, just like at HD. Except the customer isn't shaking paint, they want to modify it for use in a research lab. However, the shaking action is too vigorous and the flasks break at startup. I don't think the ramp rate is critical.
It looks like the link provided by my friend in Maryland may be just what I need. Thank you.

John