Electric Motor Torque Speed Curve

Zero at 0 speed and.

Electric motor torque speed curve.

The x axis is motor speed from 0 to 120 hertz. The starting torque is indicated on the torque speed curve shown above. Figure 1 provides a graphical illustration of these changes. The y axis is the percent of hp and torque.

Like pumps motors produce a torque speed curve of their own. Torque speed curve the torque developed by a conventional 3 phase motor depends on its speed but the relation between the two cannot be represented by a simple equation. Pull up torque put 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. The accuracy of the induction motor model has limitations and the actual torque speed characteristic is somewhat more complicated than the model predicts.

The motor region of the torque speed curve. 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. The power is just peaking at around 6000rpm. The plots below show a number of different torque speed curves due to differences in the motor designs.

Torque speed plots in the motoring region. Common features of interest are noted and discussed below. It is easier to show the relationship in the form of a curve fig. Motor torque speed curve is a very good approximation.

In this diagram t represents the nominal full load torque of the motor. The universal motor torque speed characteristic follows 1 x 2 relationship. At 60 hertz base motor speed both hp and torque are at 100 percent. When the speed of an ac motor is controlled by a vfd hp or torque will change depending on the change in frequency.

The linear model of a d c. The induction motor torque speed curve is typical of this type of motor having a low starting torque and a peak torque just below. In this overlay the shaded area reflects the. As the motor picks up speed torque decreases slightly to the lowest point shown on the curve above.

Figure 7 shows the torque speed characteristic as it might actually appear. The motoring region of the induction machine torque speed curve is the region of greatest interest. The power produced by the motor depends on the speed of the motor and is. The full torque from zero speed is a major advantage for electric vehicles.

Normally at it s top at operating speed. In this case the relatively large starting torque is achieved with realistic current values. One is a plot of empirical data and the other was plotted mechanically using a device developed at mit.