Electric Motor Torque Curve

You ll all be familiar with the look of a torque curve.

Electric motor torque curve. As the motor picks up speed torque decreases slightly to the lowest point shown on the curve above. 1 lb ft 1 355 nm torque converter. Nr rated rotational speed rev min rpm in metric units the rated torque can be expressed as. For completeness only in this graph is represented also the output power curve in w y4 axis.

In this case unless external limitations are applied the maximum torque is achieved at low rpm. Motor characteristics are frequently given as two points on this graph. A small mound compared to a power curve s steep incline. Like pumps motors produce a torque speed curve of their own.

This term is used for the lowest point on the torque speed curve for an electric motor which is accelerating a load up to full speed. T 750 w 9 549 2000 rpm. T 5252 php nr 1 where. In other words there is a tradeoff between how much torque a motor delivers and how fast the output shaft spins.

T 9550 pkw nr 2 where. T full load torque lb ft php rated horsepower. The torque available at this point is called pull up torque. In this overlay the shaded area reflects the accelerating torque available from the motor to drive the pump.

Electric motor power vs. Power kw torque nm example torque from an electrical motor. Torque nm speed rpm electric motor speed vs. The graph above shows a torque speed curve of a typical d c.

The torque delivered from an electrical motor producing 0 75 kw 750 w at speed 2000 rpm can be calculated as. In imperial units the full load torque can be expressed as. Note that torque is inversely proportioal to the speed of the output shaft. By overlaying the torque speed curve of a pump and a motor one can verify that the motor is producing enough accelerating torque to drive the pump to full speed as shown below.

For every motor there is a specific torque speed curve and power curve. For example the ac motor found in the tesla roadster 2008 produces near constant maximum torque from 0 to about 6000 rpm while maximum power occurs at about 10000 rpm long after torque begins to drop off.