Electric Motor Rpm Torque Curve

The roadster s redline is 14000 rpm.

Electric motor rpm torque curve. N revolution per minute rpm alternatively. In this overlay the shaded area reflects the accelerating torque available from the motor to drive the pump. Motor torque speed curve is a very good approximation. 1 ft lb f 1 356 nm.

Torque in imperial units can be calculated as. 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. Electrical motor power velocity and torque equations. The torque speed curves shown below are actual curves for the green maxon motor pictured at right used by students in 2 007.

Figure 1 provides a graphical illustration of these changes. 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. Reciprocating steam engines and electric motors can start heavy loads from zero rpm without a clutch. The linear model of a d c.

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 inlb p hp 63025 n 1. Usually in rpm v. Like pumps motors produce a torque speed curve of their own.

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. This is the opposite coefficient of the linear speed torque curve. One is a plot of empirical data and the other was plotted mechanically using a device developed at mit. As a current flows through the electric motor a related electrical charge causes an armature to rotate.

T ftlb p hp 5252 n 1b. P hp horsepower delivered by the electric motor hp. T ftlb torque lb f ft. Other electric motors may in fact produce maximum torque throughout their entire operating range.

Thankfully in electric motors maximum torque is produced from the get go. T inlb torque in lb f. 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.