How do I make the virtual motor work in multisim?

[LB1]

The motor has an excitation coil(terminals 3 & 4) and armature(terminals 1 & 2) and a terminal to monitor motor rpm. No mater what value of dc battery I use, the rpm is always negative and approx. -20.xxx ~ 22.xxx.

[Popnoy]

Ye, I also want to know that. Any one can help?   :manhappy:

[TMP]

There appears to be a problem with the motor model where the meter is always outputting a negative RPM.  This problem will be forward to

EWB RD

to correct in future release.  For now, reverse the volt meter connection to show positive RPM.

.

[PGriese]

I think the problem lies within the standard values of the MOTOR_VIRTUAL. If you place a MOTOR_VIRTUAL, it has a relatively high load torque, which is larger than the torque the motor can drive at any voltage. If I use the following settings, and drive the Motor from 0-100V it works as expected.

See also attached an example file which implements an TTL encoder mounted on the motor axes.

Message Edited by Peter Schlosser on 07-05-2006 09:42 AM