Electric Motor Torque Curve

Electric motor power vs.

Electric motor torque curve.

Note that torque is inversely proportioal to the speed of the output shaft. In imperial units the full load torque can be expressed as. You ll all be familiar with the look of a torque curve. Like pumps motors produce a torque speed curve of their own.

T full load torque lb ft php rated horsepower. In other words there is a tradeoff between how much torque a motor delivers and how fast the output shaft spins. In the first cartesian dial are shown the torque in nm x axis the rotation speed in rpm y1 axis the current consumption in a y2 axis the efficiency y3 axis. Torque nm speed rpm electric motor speed vs.

In this overlay the shaded area reflects the accelerating torque available from the motor to drive the pump. Power kw torque nm example torque from an electrical motor. The torque delivered from an electrical motor producing 0 75 kw 750 w at speed 2000 rpm can be calculated as. T 750 w 9 549 2000 rpm.

1 lb ft 1 355 nm torque converter. As the motor picks up speed torque decreases slightly to the lowest point shown on the curve above. 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. Nr rated rotational speed rev min rpm in metric units the rated torque can be expressed as.

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. In this case unless external limitations are applied the maximum torque is achieved at low rpm. The graph above shows a torque speed curve of a typical d c. Slowly ascending upwards before peaking and dropping back down.

In the technical data sheets the output power curve is not present. The torque available at this point is called pull up torque. For completeness only in this graph is represented also the output power curve in w y4 axis. 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.

T 9550 pkw nr 2 where. A small mound compared to a power curve s steep incline.