Electric Motor Torque Graph

Motor characteristics are frequently given as two points on this graph. Generally horsepower is a unit for measuring the power of various electrical motors piston engines steam turbines etc and it is equal to 746 watts or 33 0000 lb ft per. When the speed of an ac motor is controlled by a vfd hp or torque will change depending on the change in frequency.

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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.

Electric motor torque graph. In other words there is a tradeoff between how much torque a motor delivers and how fast the output shaft spins. T inlb torque in lb f. This explains why the torque curve begins to diminish on an ev dyno graph as the car s electric motors are pushed into the upper ranges of their performance limits. Figure 1 provides a graphical illustration of these changes.

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. Note that torque is inversely proportioal to the speed of the output shaft. At 60 hertz base motor speed both hp and torque are at 100 percent. At full load torque the speed of the electric motor is slightly less than the synchronous speed as shown in the curve above.

T ftlb torque lb f ft. T inlb p hp 63025 n 1. The x axis is motor speed from 0 to 120 hertz. P hp horsepower delivered by the electric motor hp.

Full load torque flt the torque required to produce rated power at full load speed. 1 ft lb f 1 356 nm. Torque in imperial units can be calculated as. Horsepower to torque converter is an online tool used in electrical engineering to calculate how much torque will be generated according to the input power value either in horsepower or watts.

N revolution per minute rpm alternatively. The graph above shows a torque speed curve of a typical d c. Electrical motor power velocity and torque equations. Weight lbs linear velocity ft min speed of driving motor rpm change in speed rpm and time to accelerate total system sec in addition to the torque required to drive the load at a steady speed torque is required to accelerate the load.

The y axis is the percent of hp and torque. Full load torque is developed with the motor operating at rated voltage frequency and load. T ftlb p hp 5252 n 1b.