Free-to-use online motor speed/torque plotting tool

By entering the three main parameters of motor power, speed and derating percentage, users can plot the torque/speed model of either force ventilated or self-ventilated, squirrel cage induction motors controlled with a frequency inverter.

The graph is fully interactive and shows the entire speed range of the motor, providing a useful tool to assist engineers in calculations. A unique feature of the tool is the display of 70 percent of breakdown torque in Newton-metres (Nm), which again can be determined by applying the three main parameters. The 70 percent of breakdown torque means that there is a 30 percent reserve for acceleration torque during the VSD control.

To make the tool even more accessible and easy to use, there are no login requirements and the web page does not ask for any user details. Users can go straight to the calculation tools drop-down menu on the Exico website and begin using it straight away.

This latest calculation tool complements Exico’s other free-to-use tools which include power reduction due to ambient temperature, calculation of short or intermittent duty cycles, calculation of energy saving potential and plotting of IE3 and IE4 induction motor efficiency against percentage load.