Electric Motor Torque Speed Curve

The accuracy of the induction motor model has limitations and the actual torque speed characteristic is somewhat more complicated than the model predicts.

Electric motor torque speed curve.

In this overlay the shaded area reflects the. Zero at 0 speed and. In this diagram t represents the nominal full load torque of the motor. The plots below show a number of different torque speed curves due to differences in the motor designs.

One is a plot of empirical data and the other was plotted mechanically using a device developed at mit. The motor region of the torque speed curve. Normally at it s top at operating speed. The full torque from zero speed is a major advantage for electric vehicles.

As the motor picks up speed torque decreases slightly to the lowest point shown on the curve above. Overlaying torque speed curves to match motors to pumps. At 60 hertz base motor speed both hp and torque are at 100 percent. It is easier to show the relationship in the form of a curve fig.

Torque speed plots in the motoring region. The power produced by the motor depends on the speed of the motor and is. The induction motor torque speed curve is typical of this type of motor having a low starting torque and a peak torque just below. The torque is the twisting force that makes the motor running and the torque is active from 0 to 100 operating speed.

The power is just peaking at around 6000rpm. Like pumps motors produce a torque speed curve of their own. The universal motor torque speed characteristic follows 1 x 2 relationship. Common features of interest are noted and discussed below.

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. The y axis is the percent of hp and 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. In this case the relatively large starting torque is achieved with realistic current values.

The starting torque is indicated on the torque speed curve shown above. The torque speed curves shown below are actual curves for the green maxon motor pictured at right used by students in 2 007. When the speed of an ac motor is controlled by a vfd hp or torque will change depending on the change in frequency. 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.

Figure 7 shows the torque speed characteristic as it might actually appear. Figure 1 provides a graphical illustration of these changes. The linear model of a d c.