Electric Motor Torque Curve

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

Electric motor torque curve.

Torque nm speed rpm electric motor speed vs. Motor characteristics are frequently given as two points on this graph. The graph above shows a torque speed curve of a typical d c. In imperial units the full load torque can be expressed as.

T 750 w 9 549 2000 rpm. In this case unless external limitations are applied the maximum torque is achieved at low rpm. Slowly ascending upwards before peaking and dropping back down. T full load torque lb ft php rated horsepower.

The torque delivered from an electrical motor producing 0 75 kw 750 w at speed 2000 rpm can be calculated as. T 9550 pkw nr 2 where. Note that torque is inversely proportioal to the speed of the output shaft. Like pumps motors produce a torque speed curve of their own.

Electric motor power vs. In other words there is a tradeoff between how much torque a motor delivers and how fast the output shaft spins. For completeness only in this graph is represented also the output power curve in w y4 axis. A small mound compared to a power curve s steep incline.

Power kw torque nm example torque from an electrical motor. In the technical data sheets the output power curve is not present. 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. T 5252 php nr 1 where.

For every motor there is a specific torque speed curve and power 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. Nr rated rotational speed rev min rpm in metric units the rated torque can be expressed as. 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.

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. 1 lb ft 1 355 nm torque converter.