Electric Motor Rpm Torque Curve

1 ft lb f 1 356 nm.

Electric motor rpm torque curve.

Introduction of a vfd when the speed of an ac motor is controlled by a vfd hp or torque will change depending on the change in frequency. The roadster s redline is 14000 rpm. T inlb torque in lb f. T inlb p hp 63025 n 1.

Electrical motor power velocity and torque equations. Figure 1 provides a graphical illustration of these changes. Other electric motors may in fact produce maximum torque throughout their entire operating range. As a current flows through the electric motor a related electrical charge causes an armature to rotate.

One is a plot of empirical data and the other was plotted mechanically using a device developed at mit. Thankfully in electric motors maximum torque is produced from the get go. Motor torque speed curve is a very good approximation. Reciprocating steam engines and electric motors can start heavy loads from zero rpm without a clutch.

In this overlay the shaded area reflects the accelerating torque available from the motor to drive the pump. The linear model of a d c. This is the opposite coefficient of the linear speed torque curve. Like pumps motors produce a torque speed curve of their own.

For example the ac motor found in the tesla roadster 2008 produces near constant maximum torque from 0 to about 6000 rpm while maximum power occurs at about 10000 rpm long after torque begins to drop off. Relationship between torque power and energy. Speed torque gradient. That is why the shaft and frame of a 900 rpm motor are usually larger than those of an 1 800 rpm motor of the same hp.

P hp horsepower delivered by the electric motor hp. Usually in rpm v. Steam engines and electric motors tend to produce maximum torque close to zero rpm with the torque diminishing as rotational speed rises due to increasing friction and other constraints. T ftlb p hp 5252 n 1b.

The torque speed curves shown below are actual curves for the green maxon motor pictured at right used by students in 2 007. 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. T ftlb torque lb f ft.