How is horse power determined in a motor?
by 
william schafer
ANSWERS: 1
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There are a couple of different methods used to test motor output. You can test "Brake horse power" by attaching a brake (like a car wheel brake) to the output shaft and measuring how much braking force it takes to slow down the motor at a given speed. You can also put strain gauges on the shaft and measure the torque being transmitted. Power output is computed from torque and rpm. On vehicles they can put the wheels on a dynomometer and measure how much work is done by the drive wheels after transmission, friction and other losses. It is possible to calculate how much power the motor produces even though some of it may be use to run the motor so you can't actually use that much. Most advertised numbers are design numbers that may differ from measured values by 10% or so because of manufacturing variations.
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