Electric Motor Torque Speed Curve

Figure 1 provides a graphical illustration of these changes.

Electric motor torque speed curve.

Zero at 0 speed and. At 60 hertz base motor speed both hp and torque are at 100 percent. The motoring region of the induction machine torque speed curve is the region of greatest interest. Figure 7 shows the torque speed characteristic as it might actually appear.

The torque is the twisting force that makes the motor running and the torque is active from 0 to 100 operating speed. 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 torque speed curves shown below are actual curves for the green maxon motor pictured at right used by students in 2 007. Torque speed plots in the motoring region.

In this case the relatively large starting torque is achieved with realistic current values. 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 x axis is motor speed from 0 to 120 hertz. Common features of interest are noted and discussed below.

The plots below show a number of different torque speed curves due to differences in the motor designs. When the speed of an ac motor is controlled by a vfd hp or torque will change depending on the change in frequency. It is easier to show the relationship in the form of a curve fig. 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. The y axis is the percent of hp and torque. Normally at it s top at operating speed. One is a plot of empirical data and the other was plotted mechanically using a device developed at mit.

Overlaying torque speed curves to match motors to pumps. The power produced by the motor depends on the speed of the motor and is. The starting torque is indicated on the torque speed curve shown above. The full torque from zero speed is a major advantage for electric vehicles.

The power is just peaking at around 6000rpm. The universal motor torque speed characteristic follows 1 x 2 relationship. 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 diagram t represents the nominal full load torque of the motor.

Like pumps motors produce a torque speed curve of their own. In this overlay the shaded area reflects the. The linear model of a d c.