# Electric motors

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## fine art of load testing d-c motors, The | Electrical Apparatus | Find Articles at BNET

Another common load point is known as “Locked Rotor” or “Stalled Torque”. A full current is applied to a Hysteresis Brake, Dynamometer, or by simply clamping or “locking” the motor shaft and energizing the motor. More torque is produced by the Dynamometer/Brake than the motor can produce. In this state the shaft cannot turn, simulating the rotor being “locked” or “blocked”. This test is very hard on a motor.

## Motor Formulas

Calculating Braking Torque: Full-load motor torque is calculated to determine the required braking torque of a motor. To Determine braking torque of a motor, apply this formula: T = 5252 x HP rpm T = full-load motor torque (in lb-ft) 5252 = constant (33,000 divided by 3.14 x 2 = 5252) HP = motor horsepower rpm = speed of motor shaft Example: What is the braking torque of a 60 HP, 240V motor rotating at 1725 rpm? T = 5252 x HP rpm T = 5252 x 60 1725 T = 315,120 1725 T = 182.7 lb-ft Calculating Work: Work is applying a force over a distance.
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## Overview Tutorial of Electric Motor Types

The induction motor can be considered as an AC transformer with a rotating secondary winding. Transformer Action The stator carries the motor primary windings and is connected to the power source. There are normally no external connections to the rotor which carries the secondary windings.

## Electric Drives - AC Motors - Description and Applications

Expert: Brendan - 9/9/2009 Question QUESTION: Hi Brendan , I was wondering if you could tell me how to hook up the WD-8074FHB motor from LG frontendloader washer to an AC power source. I need to know how many volts this motor can handle as i cant seem to find any specs on the actual motor itself.I have one and I am putting the power to it through a variac power controller so i can adjust the speed of it. The motor has the three prongs on the top in the small brown rectangle part and i dont know how to put the power to these without having it smoke up although this was dirct power from a 240V AC outlet .