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# Apply line-to-line voltage to EMD Synchrnous Motor

Builder

Hi,

In EMD library, the source inputs of the sychrnous motor (for example, PMSM) are line-to-neutral voltages. In reality, if there are three power leads coming from the motor windings, the three phase source connected to the leads are line-to-line quantity. So I am wondering if it is possible to apply line-to-line voltage to the model.

Thanks,

Kan

2 REPLIES 2

# Re: Apply line-to-line voltage to EMD Synchrnous Motor

Siemens Valued Contributor

Hi kan,

In the EMD library, all 3 phase motor models take as input electric potential. Fom this we derive:

• the line to line voltage as the potential difference between 2 lines.
• the phase voltage as the potential difference between the input and the output of a phase (UsA,UsB,UsC).

Now depending if the motor is star or delta connected, we have the following relation:

Star:

Line to line voltage = sqrt(3) * phase voltage (phase voltage in star is also called line to neutral voltage)

Line current = phase current

Delta:

Line to line voltage =  phase voltage

Line current = sqrt(3) * phase current

I would say it is up to you to provide the correct potential to your machine based on those relations.

Best regards,

Florent

Builder

Hi fpasteur,