Article Posted by Kollmorgen on 9th November 2021 on the Kollmorgen Blog in Motion 

 

 

First you will need to know the maximum winding temperature of the motor based on the published ratings data (e.g. 40°C ambient).

If not directly given within the motor’s catalog data, it can be determined by adding the 40°C to the published delta (Δ) Temperature of the winding (assuming it is given; if not, you will need to contact the motor’s manufacturer. Assuming it is given to be 100°C, the maximum winding temperature = 140°C).

 

where ΔTemp Rated = Temp(maximum winding) – Temp(rated ambient)

So the new continuous torque Tc(new) would be:

 

 

Torque required, Tr(new) at a specific RPM, can also be estimated by graphically finding the maximum continuous capability with the specified ambient temperature at the desired RPM, from the motor’s performance curve (PC), if not available from the motor’s data sheet.

This is most often done by graphically determining Tr(40°C) at the desired RPM from the motor’s PC and using it in place of Tc(40°C), in the above formula.

 

 

 

 

Hurley Gill is a senior application engineer at Kollmorgen. With over 40 years of expertise in the motion control and automation industry, he is often called upon to solve the toughest of application challenges for Kollmorgen customers. Hurley holds a B.S. degree in electrical and electronic engineering technology from Virginia Tech. When not focusing on motion control, Hurley enjoys data analysis, harmonics and building/rebuilding projects.