Electric Motor Torque Speed Curve

The y axis is the percent of hp and torque.

Electric motor torque speed curve.

The torque speed curves shown below are actual curves for the green maxon motor pictured at right used by students in 2 007. 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. At 60 hertz base motor speed both hp and torque are at 100 percent. Overlaying torque speed curves to match motors to pumps.

In this diagram t represents the nominal full load torque of the motor. When the speed of an ac motor is controlled by a vfd hp or torque will change depending on the change in frequency. Zero at 0 speed and. 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 linear model of a d c. In this case the relatively large starting torque is achieved with realistic current values. The plots below show a number of different torque speed curves due to differences in the motor designs. Common features of interest are noted and discussed below.

Figure 1 provides a graphical illustration of these changes. 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 universal motor torque speed characteristic follows 1 x 2 relationship.

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. 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. Like pumps motors produce a torque speed curve of their own.

The starting torque is indicated on the torque speed curve shown above. Normally at it s top at operating speed. Torque speed plots in the motoring region. 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. The x axis is motor speed from 0 to 120 hertz. Motor torque speed curve is a very good approximation. 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 full torque from zero speed is a major advantage for electric vehicles. It is easier to show the relationship in the form of a curve fig. The power produced by the motor depends on the speed of the motor and is.