How to Measure Electric Motor Torque
By Raul Avenir, eHow Contributor
updated January 18, 2011
Quoted from: http://www.ehow.com/how_7810276_measure-electric-motor-torque.html
Torque refers to the rotational effect produced when force is applied to an object and is measured in Newton-meter (N.m) in metric system, or pound-feet in U.S. system. Electrical energy, measured in watts, can be used to produce torque, and an electric motor is a good example of electrical energy that can produce torque. Measuring electric motor torque requires using a formula.
A power screwdriver is a good example of electric motor torque.
Instructions
Things You'll Need: Calculator
1. Look at the owner's manual of the electric motor, or electrical appliance that has an electric motor (such as a power screwdriver). Find the rating of the motor in terms of volts, amperes, and rpm. Look at the manufacturer's nameplate or tag attached to the motor, or appliance in case there is no owner's manual.
2. Multiply the number of volts by the amperes to calculate the number of watts of the motor. For example, the number of watts of a power screwdriver with a rated voltage of 120 volts and 4 amperes is 480 watts (120 volts x 4.0 amps = 480 watts).
3. Divide the number of watts by 746 to get the horse power rating of the electrical motor. Using the example numbers, divide 480 watts by 746 to get the equivalent horsepower (480 watts divided by 746 = 0.6434316 horsepower).
4. Multiply the horsepower by 5,252 using a calculator. Using the example figure, multiply 0.6434316 by 5,252 to get 3,379.3027.
5. Divide the answer by the motor's rated number of rpm to get the measurement of the torque in pound-feet. Using the example figure, divide 3,379.3027 by 2,500 rpm to arrive at 1.351721 pound-feet of torque.
HIMAX Electric Screwdriver suggest: If you wanna use electric screwdrivers to assembly precise electronics, you'd better use digital torque meter to measure and adjust the torque of your electric tools to achieve accurate torque control.
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欢迎参观我们的网站www.ehimax.com 选购各式工具，我们同时也在脸书、Google+、Blogger、Wordpress.com上分享各类电动工具维修操作要诀及相关知识，并定期公布新品资讯及优惠活动。您也可在推特及噗浪上关注我们的最新讯息。 HIMAX台力牌电动起子感谢您的支持！
