Electric Motor Rpm Torque Curve

1 ft lb f 1 356 nm.

Electric motor rpm torque curve.

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. The speed torque curve is expressed by the following equation n as speed t as torque. 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. 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. The torque speed curves shown below are actual curves for the green maxon motor pictured at right used by students in 2 007. P hp horsepower delivered by the electric motor hp. Electrical motor power velocity and torque equations.

T ftlb p hp 5252 n 1b. 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. Relationship between torque power and energy.

Speed torque gradient. Figure 1 provides a graphical illustration of these changes. 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.

Like pumps motors produce a torque speed curve of their own. 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. T ftlb torque lb f ft.

This is the opposite coefficient of the linear speed torque curve. Reciprocating steam engines and electric motors can start heavy loads from zero rpm without a clutch. Torque in imperial units can be calculated as. N revolution per minute rpm alternatively.

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