To find force torque, by means of a dynamometer measure the force, and her shoulder. Multiply their values and receive torque. If the power developed by the turning mechanism is known, then moment of force can be found, knowing its frequency of rotation. It is also possible to find torque, having measured the work performed by the engine.
It is required to you
- Measurement requires a stop watch, a ruler or a roulette, a dynamometer, the tachometer, the ampermeter.
Instruction
1. Force torque. Torque is measured on the rotating body. For this purpose define a point of its rotation and a point of application of force, having drawn between them a straight line. Measure an acute angle between this line and the direction (vector) of force. Torque will be equal to the work of value of force which you will measure by means of a dynamometer in newtons, on distance to a point of rotation (shoulder) and an acute angle between a shoulder and a vector of force (M=F • l· sin(α)). The maximum moment is reached when force is perpendicular to a shoulder and if force is parallel (coincides with the line of a shoulder), then moment of force will be equal to zero.
2. Torque depending on power. The engine giving torque has a certain rated power which can be found in technical documentation or to measure. To find its torque, by means of the tachometer measure the frequency of its rotation on a shaft in revolutions per minute. Measure engine capacity in kilowatts. To receive value of torque of the engine value of power increase by 9550 and divide into the frequency of rotation of a shaft. Torque in newtons on meter will be result.
3. Electric motor torque. The simplest electric motor – a frame from the conductor with current in magnetic field. Place a frame in magnetic field with the known induction. Connect it to a source of electric current and by means of the ampermeter measure current in a frame. Measure by a ruler force shoulder from a rotation axis to the vertical conductor of a frame and also length of vertical conductors. Then the maximum torque will be equal to performing magnetic induction on the current, length of the vertical conductor, and a shoulder of action of force. Increase result by 2 (M=2·B·I· l·r). Such torque will develop in case the shoulder is perpendicular to the direction of force of the electromagnetic field.