Electric Motor Torque Curve

Visually as power in w is equal to torque in n m times speed in rad s it s the area of the square under the speed torque characteristic curve at half the stall torque.

Electric motor torque curve.

The torque is the twisting force that makes the motor running and the torque is active from 0 to 100 operating speed. Pull up torque put this term is used for the lowest point on the torque speed curve for an electric motor which is accelerating a load up to full speed. While engines and motors have a large range of operating speeds the power band is usually a much smaller range of engine speed only half or less of the total engine speed range electric motors are an exception see the. Motor torque speed curve is a very good approximation.

As a current flows through the electric motor a related electrical charge causes an armature to rotate. Zero at 0 speed and. The power produced by the motor depends on the speed of the motor and is. Second or third gear would be a more realistic target but then an electric motor torque curve is substantially different to an ice and the torque of an in wheel motor can be changed on the scale of single milliseconds as opposed to hundreds of milliseconds in the case of a suspended powertrain.

One is a plot of empirical data and the other was plotted mechanically using a device developed at mit. Torque is the turning force through a radius with the units nm in the si system and the units lb ft in the imperial system. For completeness only in this graph is represented also the output power curve in w y4 axis. The torque speed curves shown below are actual curves for the green maxon motor pictured at right used by students in 2 007.

The driving force of an electric motor is torque not horsepower. The torque developed by an asynchronous induction motor varies when the motor accelerates from zero to maximum operating speed. This is the torque used to start accelerating the load. Locked rotor or starting torque.

The power band of an internal combustion engine or electric motor is the range of operating speeds under which the engine or motor is able to operate most efficiently. Thankfully in electric motors maximum torque is produced from the get go.