Electric Motor Torque Curve

Torque nm speed rpm electric motor speed vs.

Electric motor torque curve.

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. In this overlay the shaded area reflects the accelerating torque available from the motor to drive the pump. Electric motor power vs.

In the technical data sheets the output power curve is not present. 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. T 5252 php nr 1 where.

You ll all be familiar with the look of a torque curve. In this case unless external limitations are applied the maximum torque is achieved at low rpm. The torque available at this point is called pull up torque. 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.

Motor characteristics are frequently given as two points on this graph. T 750 w 9 549 2000 rpm. T 9550 pkw nr 2 where. As the motor picks up speed torque decreases slightly to the lowest point shown on the curve above.

Power kw torque nm example torque from an electrical motor. T full load torque lb ft php rated horsepower. For completeness only in this graph is represented also the output power curve in w y4 axis. 1 lb ft 1 355 nm torque converter.

Slowly ascending upwards before peaking and dropping back down. The graph above shows a torque speed curve of a typical d c. A small mound compared to a power curve s steep incline. In imperial units the full load torque can be expressed as.

In other words there is a tradeoff between how much torque a motor delivers and how fast the output shaft spins. 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.