• ### How to Calculate RMS Torque

February 07, 2017, by Hurley Gill

Question: How do I calculate RMS Torque for a given axis motion profile in my application?

• ### What is horsepower and how is it utilized with servo motors

June 23, 2017, by Hurley Gill

Question: What is horsepower (hp) and how is it utilized with servomotors?

• ### Motor Derating Due To High Ambient Temperatures

May 26, 2017, by Hurley Gill

Since the motor’s continuous torque (Tc) is rated in a 40°C ambient, how can I estimate the motor’s continuous torque during my worst-case ambient temperature of 55°C?

• ### Issues to Consider when Operating a Motor in a Vacuum

March 31, 2017, by Hurley Gill

Question: Operating a servo motor in a vacuum, what are some considerations?

• ### Switched at Birth: Motor Winding Nomenclature Explained

May 06, 2016, by Hurley Gill

If you have been following along on our Evolution of Kollmorgen posts, you realize Hugo Unruh was one of the first to successfully commercialize frameless motor technology. What most people don't realize is that Kollmorgen's motor-drive phase identification standards (A, B, C) were based on these frameless motors. Now the issue at hand is both sides of a frameless motor typically look the same, except for the side where the wire leads exit.

• ### Why Would Anyone Use a Linear Thermistor Over the Industry Standard Avalanche PTC/NTC Type Thermistor?

October 03, 2014, by Hurley Gill

There are challenges for a servo motor's protection against overheating by the manufacturer, machine designer/OEM, and user, because there is no thermal device that can protect a motor against a fast transient event. For just as there is a time lag between the final steady-state temp rise of a coil of wire with a given current going through it, there is a time lag for the thermal device to achieve its trip resistance once that trip/application temperature has been presented to the thermal device.

• ### Cogging and Torque Ripple Questions

July 18, 2014, by Hurley Gill

Cogging and Torque Ripple questions are common and many times, difficult to answer.

Cogging torque is defined as the attraction/interaction of the magnetic poles to the teeth (steel structure) of the laminations within an un-energized motor.

Torque ripple is defined as the variance of the torque of the energized motor with a constant current. They are related in position independent of magnitude or direction, but cogging torque is generally not presented as a specification for servo motors.