motor nameplate

[jcole]

Good day guys and gals.

I have a motor nameplate that has "mag. cur." on the nameplate of 10.8/5.4. What is "mag. cur."? Its a Baldor inverter duty motor with a FLA of 21/10.5.

 

[ActionDave]

That's odd. Can you post a picture?

 

[jcole]

That's odd. Can you post a picture?

 

[Russs57]

Magnetising current would be my guess.

 

[bwat]

Yes, magnetizing current. VFD might need to know this if it can't determine an appropriate model of the motor by itself.

 

[synchro]

Magnetizing current is the reactive current due to the inductive reactance of the motor. In a VFD that current will circulate between the motor windings and the capacitors on the DC bus of the drive. So as bwat mentioned that's an important parameter for the VFD.

 

[Jraef]

When you are setting up a high precision Flux Vector Control (FVC) application with a VFD, you need more details of the motor circuit than you do for basic stuff. In earliest days of using FVC, you had to enter that data manually into a set of special parameters in the VFD, but getting that info from motor mfrs was challenging; this was Baldor's attempt to try to make that easier.

A couple of decades or more ago, VFD mfrs came up with good "auto-tune" routines in the VFD setup that allow the drive itself to go "find" those values by testing.

 

[jcole]

Thanks for the replies.