Learning Forum

[Zhengting.Wu]

hello there,

I want to do a failure test for my 3-Phase PMSM Model. I want to see how will the Motor acting when suddenly one Phase has open circuit fault. So I add a Voltage Controlled Switch, with a Pulse Voltage Source as the Controlling Source, to control the A phase and course a open circuit(see in the following pics).

But the Switch did not work. As you can see: the Pulse Voltage worked will, but the current of Phase A did not change along with it. I tried many times and found out that it was the Switch who wasing working.

Please help. The screenshots of circuit, settings and results are attached. THANKS!

 

Mod setting

Switch setting

circuit

[Reshmi Raghavan]

Hello Zhengting,

The cirucit can be modelled as below.

I have shared the information on the switch model and the pulse input. The circuit will have normal operation till 40ms and for next 10ms open circuit would be created the system will get back to normal working mode after 10ms.

[Zhengting.Wu]

Hello Mr.Raghavan,

thank you for your reply! I have modelled my circuit as yours but I got this Error with the switch:

I didnt know why I got this. Can you please tell me how to solve this problem? Thanks!

[Reshmi Raghavan]

Hello Zhengting,

Please check the switch model, if the name POS is used in the properties or not ?

[Zhengting.Wu]

Hello,

yes, POS is used in the properties. It can only be POS or NEG.

[Reshmi Raghavan]

Hello Zhengting,

 

The reference to the voltmeter has not been provided in the switch property, ID_V is empty. Please enter the name of the voltmeter used for measuring the voltage from the pulse circuit.

[Zhengting.Wu]

Hello Mr.Raghavan,

thank you for your advise! This Error has been solved and I sucessfully import my Circuit. But now I have another problem by analysing. It has following errors when I try to analyse the Model. Is this because my computer doesn't have enough RAM? (It runs well with other Models.) 

[Zhengting.Wu]

Updates:

I added resistors in the circuit and it worked. But the switch model still didnt work.

here are the results:

 

[Reshmi Raghavan]

Hello Zhengting,

Please share the error messages, its not visible.

[Zhengting.Wu]

Hello!

Here are the error mssages when I didnt add resistors in the circuits :

 [error] Time step at 0 sec completed, process solver2d error: Internal Solver Error:  'Unable to create extnlckt_1.par file. '. Please contact Ansys technical support. (10:56:06 AM  Jan 16, 2024)
    [error] Error in estimating the memory for Auto HPC. (10:56:06 AM  Jan 16, 2024)
    [error] Simulation completed with execution error on server: Local Machine. (10:56:06 AM  Jan 16, 2024)

After I added one resistor for each Phase, there were no error messages anymore, but the switch didnt work. I added the switch in Phase A but the current of Phase A remained unchanged.