Electric Motor Torque Speed Curve

In this diagram t represents the nominal full load torque of the motor.

Electric motor torque speed curve. The motoring region of the induction machine torque speed curve is the region of greatest interest. As the motor picks up speed torque decreases slightly to the lowest point shown on the curve above. Torque speed plots in the motoring region. The y axis is the percent of hp and torque.

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 torque is the twisting force that makes the motor running and the torque is active from 0 to 100 operating speed. Like pumps motors produce a torque speed curve of their own. It is easier to show the relationship in the form of a curve fig.

Common features of interest are noted and discussed below. 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. The full torque from zero speed is a major advantage for electric vehicles.

The torque speed curves shown below are actual curves for the green maxon motor pictured at right used by students in 2 007. Overlaying torque speed curves to match motors to pumps. In this overlay the shaded area reflects the. The starting torque is indicated on the torque speed curve shown above.

Figure 1 provides a graphical illustration of these changes. The motor region of the torque speed curve. Figure 7 shows the torque speed characteristic as it might actually appear. 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 linear model of a d c. Normally at it s top at operating speed. Zero at 0 speed and. 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. In this case the relatively large starting torque is achieved with realistic current values. At 60 hertz base motor speed both hp and torque are at 100 percent. The power produced by the motor depends on the speed of the motor and is.

One is a plot of empirical data and the other was plotted mechanically using a device developed at mit. When the speed of an ac motor is controlled by a vfd hp or torque will change depending on the change in frequency. The x axis is motor speed from 0 to 120 hertz.