Search this blog

Most viewed

2011年5月30日 星期一

How to Measure Electric Motor Torque

How to Measure Electric Motor Torque
By Raul Avenir, eHow Contributor
updated January 18, 2011

Quoted from:

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.

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.

Welcome to visit:


HIMAX Electric Screwdriver is a professional electrical tool supplier in China since 2001. Like HIOS, Kilews, Delvo, Kolver, ASA, Conos and so on,  we are proficient in manufacturing electric screwdrivers. HIMAX Electric Screwdrivers are designed especially for the assembly line of  electronic products such as tablet, PC, laptop, digital camera, cell phone, game console, mobile devices and so on. HIMAX Electric Screwdriver possess accurate torque control to accomplish precision screw fasten tasks and can be used in automation system. Fastening small screws, electronic screw and miniature screw is what we are good at.
We also offer  torque screwdriver, torque meter, screw counter, screw feeder, screw driver bits and electric power supply for electric screwdrivers with less cost  but good  quality.
We are so confident of the quality of HIMAX electrical tools and we are one of the best electric screwdriver suppliers among all the China suppliers and even in the world.
Now you can find us on Facebook, Google+, Blogger,  and Yahoo blogs. You can also follow us on Twitter and Plurk. We provide useful knowledge of electric screwdrivers and electrical tools for plant workers, factory buyers and engineers. Welcome to visit .

HIMAX台力牌电动起子 始于2001, 位于中国宁波,是专业的电动起子、电动螺丝刀、电批、电动工具制造商及供应商。就像HIOS好握速, Kilews奇力速, Delvo, Kolver, ASA好帮手, Conos技友等品牌, HIMAX台力牌电动起子也是世界最佳电动起子品牌。 HIMAX电动起子/螺丝刀/ 电批是专为精密电子及机械组装线及生产线设计的。因为HIMAX电动起子拥有精确的扭力控制,同时能够锁附各类大小的微型电子螺丝、细小螺丝,因此各项精密产品如平板电脑, 个人电脑, 计算机, 笔记型电脑, 数位相机, 手机行动电话,电视游戏机, 随身小型游戏机, 及其他随身电子产品设备等等,皆可采用HIMAX电动起子进行产品组装以确保生产品质。
欢迎参观我们的网站 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!