Efficiency map

ramin_21612

Hi,

I calculated the efficiency map within FeMT. However, the results seem to be imperfect. ‌Because the machine_Efficiency text file indicated that after 2000 rpm, the computed efficiency is shown as Nan. Where is my fault?

it should be noted that the nominal and maximum motor speed are 1500 and 4500 rpm, respectively.

Does determining the maximum phase current and voltage (rms) affect this fault? The nominal phase current and phase voltage of considered motor are 100.5 amp and 49v rms, respectively. In the e-Machine toolbox, what value should I enter for max phase current and max phase voltage (rms)?

Lavanya Vadamodala_20519

Hello Ramin,

As input to e machine toolbox, you need to provide maximum RMS values of current and voltage. Not the nominal values.

The definition of input parameters effect the output of e machine toolbox.

Can you share the whole text file?

Thank you,

Lavanya

ramin_21612

Lavanya Vadamodala_20519 said:

Hello Ramin,

As input to e machine toolbox, you need to provide maximum RMS values of current and voltage. Not the nominal values.

The definition of input parameters effect the output of e machine toolbox.

Can you share the whole text file?

Thank you,

Lavanya

Hi Lavanya,

In response to your comment, I sent the whole txt file. If you figure out where the problem is, please let me know

Thanks

 

Mohammed Elamin_22169

Hi Ramin, 

What the command mode you used when you run the efficiency map (MTPA or MTPV)? And what the maximum speed you provide as an input? 

from the shape of the efficiency map it seem like you are using MTPA (maximum torque per A), this control strategy will not allow you to reach to very high speed after the corner point. If you want to extend the speed range you should use MTPV (maximum torque per voltage). The other thing is the maximum speed input you use, make sure you use 4500 rpm. 

Thanks, 

ramin_21612

Mohammed Elamin_22169 said:

Hi Ramin, 

What the command mode you used when you run the efficiency map (MTPA or MTPV)? And what the maximum speed you provide as an input? 

from the shape of the efficiency map it seem like you are using MTPA (maximum torque per A), this control strategy will not allow you to reach to very high speed after the corner point. If you want to extend the speed range you should use MTPV (maximum torque per voltage). The other thing is the maximum speed input you use, make sure you use 4500 rpm. 

Thanks, 

Hello Mohammed,

I modified the Command mode and the maximum speed as MTPA and 4500 rpm, respectively. It is hoped that the new configuration will yield satisfactory results