Phase Voltage not changing with field voltage in a synchronous motor setup.

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Martin Komm
Martin Komm on 3 Nov 2021
Commented: Martin Komm on 4 Nov 2021
Hello all!
I'm trying to build a circuit for use in simulating a synchronous motor. I've got some initial setup, and when I first run the simulation I get some variance in my values. However, after I run it a few times, the phase voltages don't change very far from 120VAC. Even if the field voltage is dropped to 50V. Can someone elaborate on what I may be missing? I've uploaded screenshots of the ciruit, and then the parameters of the motor.
This is showing Vf=120V and the V_Phase showing ~120V.
This is showing Vf=50V and the V_Phase showing ~120V again.
Here are the parameters currently in place.
The powergui was used to automatically calculate and determine the machine initialization variables as well. Any help is appreciated. Thank you.

Answers (1)

Joel Van Sickel
Joel Van Sickel on 3 Nov 2021
Hello Martin,
I would guess there are 2 issues.
1: your load current is very load, so your machine isn't pulling any current. It is essentially an open loop test.
2: I'm not sure how realistic your machine parameters are. Do you really have a 5 ohm stator and 0.1 H inductances?
Regards,
Joel
  3 Comments
Martin Komm
Martin Komm on 4 Nov 2021
I believe the armature resistance was measured ~12ohms. I'm not sure what the Xs would be, as I don't have the calculations on hand at the moment. We were using the values to just simulate something to get the students to be able to run some sort of simulation. I appreciate the answers, and I'll get with the professor about how to move forward.
Kind regards,
Martin Komm

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