VFD for linear motors
VFD for linear motors
(OP)
Hi, All,
Does anyone have any experience of using a standard VFD to drive a linear motor? Or are you aware of any VFD's which will work with linear motors without a world of pain? Motor in question is 415V, 50Hz, 5m/s, 3A.
Thanks for the help in advance,
Mort
Does anyone have any experience of using a standard VFD to drive a linear motor? Or are you aware of any VFD's which will work with linear motors without a world of pain? Motor in question is 415V, 50Hz, 5m/s, 3A.
Thanks for the help in advance,
Mort





RE: VFD for linear motors
RE: VFD for linear motors
RE: VFD for linear motors
The rep I used was also amazingly competent, educating me, and knowing his products at a level rarely seen.
http://www.kollmorgen.com/en-us/products/drives/servo/akd/
Contact me if you're interested in this and I'll introduce you.
Keith Cress
kcress - http://www.flaminsystems.com
RE: VFD for linear motors
Disclaimer, they sign my paycheck... but that's the only COTS VFD I'm aware of that does this simply because linear motors didn't really hit the market until after I came here, and I haven't had to investigate anything else now.
"You measure the size of the accomplishment by the obstacles you had to overcome to reach your goals" -- Booker T. Washington
RE: VFD for linear motors
RE: VFD for linear motors
@Jraef - Am I correct in thinking that the Rockwell VFD is what I would call a "standard" drive, it presumably has encoder input for the speed feedback?
From my initial searching, it seems that servo drives are normally used for Linear motors, and the common control scheme is to use a fixed output frequency and vary the voltage to control the torque.
I've also seen hints that there can be large differences between manufacturer's motors, and there are also differences depending on the speed the motor is designed to run at (i.e. the synchronous speed).
Once again, thanks to all. If you have any other information, please post, I will relay any information I find interesting or potentialy useful.
Cheers,
Mort
RE: VFD for linear motors
"You measure the size of the accomplishment by the obstacles you had to overcome to reach your goals" -- Booker T. Washington
RE: VFD for linear motors
I did not work directly on the cars or drives. I did the trouble shooting, testing and commissioning on the Integrated Alarm Notification System (IANS) at Stadium Station. At some of the stations you will see large resistor banks used to burn off energy when the regenerated energy exceeds the consumed energy. In other words to limit over voltages on the DC bus.
Bill
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"Why not the best?"
Jimmy Carter
RE: VFD for linear motors
I think there may be some form of pole changing to go with the VFD, to tell the truth we just take it for granted these days.