Electric Motor Rpm Torque Curve

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.

Electric motor rpm torque curve.

T ftlb p hp 5252 n 1b. The roadster s redline is 14000 rpm. Thankfully in electric motors maximum torque is produced from the get go. 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. The torque speed curves shown below are actual curves for the green maxon motor pictured at right used by students in 2 007. 1 ft lb f 1 356 nm. Figure 1 provides a graphical illustration of these changes.

Reciprocating steam engines and electric motors can start heavy loads from zero rpm without a clutch. 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. N revolution per minute rpm alternatively. Speed torque gradient.

The speed torque curve is expressed by the following equation n as speed t as torque. This is the opposite coefficient of the linear speed torque curve. P hp horsepower delivered by the electric motor hp. T inlb torque in lb f.

Electrical motor power velocity and torque equations. As a current flows through the electric motor a related electrical charge causes an armature to rotate. Relationship between torque power and energy. Usually in rpm v.

In this overlay the shaded area reflects the accelerating torque available from the motor to drive the pump. T inlb p hp 63025 n 1. The linear model of a d c. 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.

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. Other electric motors may in fact produce maximum torque throughout their entire operating range.