Electric Motor Torque Power Curve

In this overlay the shaded area reflects the accelerating torque available from the motor to drive the pump.

Electric motor torque power curve.

Below is the typical ac induction motor characteristics. Speed of the output shaft. 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. As a current flows through the electric motor a related electrical charge causes an armature to rotate.

T fl 5252 60 hp 1725 rpm 182 7 lb ft. The torque available at this point is called pull up torque. Motor characteristics are frequently given as two points on. In other words there is a tradeoffbetween how much torque a motor delivers and how fast the output shaft spins.

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. Like pumps motors produce a torque speed curve of their own. This also is not very useful except it will determine the maximum available torque. The power produced by the motor depends on the speed of the motor and is zero at 0 speed and.

Different electric motor has different characteristics and it can be observed by its torque vs. T rated torque nm p kw rated power kw n r rated rotational speed rpm example electrical motor and braking torque. The pattern remains same for different hp ratings. Thankfully in electric motors maximum torque is produced from the get go.

As the motor picks up speed torque decreases slightly to the lowest point shown on the curve above. The graph above shows a torque speed curve of a typical d c. For every motor there is a specific torque speed curve and power curve. The power band of an internal combustion gasoline automobile engine typically starts at midrange engine speeds around 4 000 rpm where maximum torque is produced and ends close to the redline after reaching maximum power between 5 000 and 6 500 rpm.

The torque of a 60 hp motor rotating at 1725 rpm can be calculated as. In use the motor is driving a propeller. It is generally known as motor characteristic curve.