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Scalar versus vector
2

Scalar versus vector

Scalar versus vector

(OP)
Why multimotor AC roller table normally apllies scalar mode control inverter instead of sensorless  vector mode control?
Thanks.

RE: Scalar versus vector

The VFD can't perform the required sensorless vector motor monitoring/calculations when it has multiple motors connected to it.
 

RE: Scalar versus vector

(OP)
Thanks Lionel
It makes any sense to connect an encoder at one of the roller table motors?

RE: Scalar versus vector

Only if you want some feedback regarding the roller table speed for something else.

If high precision speed control is absolutely necessary, put one motor on a drive all by itself with your encoder feedback for Flux Vector control, then slave the other drive running the rest of the motors from that one. Won't be perfect but better.

If you want near perfectly precise speed control, you would need vector drives on them all and what is called a "line shaft" coordination system. Most high-end vector drives will have that available as a macro.


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