Electric Motor Rpm Torque Curve

Torque in imperial units can be calculated as.

Electric motor rpm torque curve.

The torque speed curves shown below are actual curves for the green maxon motor pictured at right used by students in 2 007. As a current flows through the electric motor a related electrical charge causes an armature to rotate. T ftlb p hp 5252 n 1b. 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.

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. T ftlb torque lb f ft. Electrical motor power velocity and torque equations.

Usually in rpm v. T inlb p hp 63025 n 1. Relationship between torque power and energy. 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.

T inlb torque in lb f. 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. The linear model of a d c. This is the opposite coefficient of the linear speed torque curve.

N revolution per minute rpm alternatively. The speed torque curve is expressed by the following equation n as speed t as torque. Speed torque gradient. Like pumps motors produce a torque speed curve of their own.

Motor torque speed curve is a very good approximation. Other electric motors may in fact produce maximum torque throughout their entire operating range. 1 ft lb f 1 356 nm. P hp horsepower delivered by the electric motor hp.

In this overlay the shaded area reflects the accelerating torque available from the motor to drive the pump. The roadster s redline is 14000 rpm. 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.