Electric Motor Torque Curve

The torque delivered from an electrical motor producing 0 75 kw 750 w at speed 2000 rpm can be calculated as.

Electric motor torque curve.

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. For completeness only in this graph is represented also the output power curve in w y4 axis. In other words there is a tradeoff between how much torque a motor delivers and how fast the output shaft spins. You ll all be familiar with the look of a torque curve.

Power kw torque nm example torque from an electrical motor. A small mound compared to a power curve s steep incline. Motor characteristics are frequently given as two points on this graph. In imperial units the full load torque can be expressed as.

T full load torque lb ft php rated horsepower. 1 lb ft 1 355 nm torque converter. Torque nm speed rpm electric motor speed vs. Like pumps motors produce a torque speed curve of their own.

T 9550 pkw nr 2 where. T 750 w 9 549 2000 rpm. In the technical data sheets the output power curve is not present. In this overlay the shaded area reflects the accelerating torque available from the motor to drive the pump.

Slowly ascending upwards before peaking and dropping back down. 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. Note that torque is inversely proportioal to the speed of the output shaft. 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.

Nr rated rotational speed rev min rpm in metric units the rated torque can be expressed as. The torque available at this point is called pull up torque. In this case unless external limitations are applied the maximum torque is achieved at low rpm. 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.

T 5252 php nr 1 where. As the motor picks up speed torque decreases slightly to the lowest point shown on the curve above.