Electric Motor Torque Curve

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

Electric motor torque curve.

In imperial units the full load torque can be expressed as. 1 lb ft 1 355 nm torque converter. The torque available at this point is called pull up torque. T 9550 pkw nr 2 where.

As the motor picks up speed torque decreases slightly to the lowest point shown on the curve above. Nr rated rotational speed rev min rpm in metric units the rated torque can be expressed as. Torque nm speed rpm electric motor speed vs. Electric motor power vs.

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. T 750 w 9 549 2000 rpm. For completeness only in this graph is represented also the output power curve in w y4 axis.

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. In the technical data sheets the output power curve is not present. For every motor there is a specific torque speed curve and power curve. Power kw torque nm example torque from an electrical motor.

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. 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. The torque delivered from an electrical motor producing 0 75 kw 750 w at speed 2000 rpm can be calculated as. In this case unless external limitations are applied the maximum torque is achieved at low rpm.

Like pumps motors produce a torque speed curve of their own. T 5252 php nr 1 where. A small mound compared to a power curve s steep incline. Motor characteristics are frequently given as two points on this graph.

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