Eng-Tips is the largest engineering community on the Internet

Intelligent Work Forums for Engineering Professionals

Congratulations waross on being selected by the Tek-Tips community for having the most helpful posts in the forums last week. Way to Go!

IEEE STD Motor X/R table

Thread starter dk101010
Start date Oct 23, 2007

Status: Not open for further replies.

Oct 23, 2007

dk101010

Electrical

Hi all,

I have a question in interpreting a X/R ratio for motors on the IEEE Std 141-1993, Figure 4A-3. The figure has two bands, and it is divided in three catagories(High,Medium, and Low Voltage). If I have a low voltage motor, does it mean the X/R ratio of the motor can be range between 1 to 6? Nowaday, we have these very high efficiency motor. Does this IEEE table still apply to these high efficiency motors?

Thank you for helping out.