A dynamometer, often called a "dyno," is used to measure force, moment of force (torque), or power.
Understanding the Dynamometer
A dynamometer is a tool that measures mechanical forces. Here's a breakdown of what it measures:
- Force: The push or pull on an object. This is a basic component of measurement.
- Moment of Force (Torque): The measure of how much a force acting on an object causes that object to rotate. Think of it as the rotational equivalent of force.
- Power: The rate at which work is done, calculated using torque and rotational speed.
What Can a Dynamometer Do?
A dynamometer is not limited to one type of application. It can measure:
- The power produced by engines
- The power produced by motors
- The power produced by any other rotating prime mover
Practical Example
Let's say we have a car engine. Using a dynamometer, we can measure:
- The torque the engine produces at different speeds.
- The rotational speed (RPM) of the engine.
- The power output of the engine, which is derived from the torque and rotational speed.
Types of Dynamometers
There are various types of dynamometers used depending on the application.
- Engine Dynamometers: Specifically designed to measure the output of engines, often used in automotive testing.
- Chassis Dynamometers: Used to measure power at the wheels of vehicles, accounting for drivetrain losses.
- Motor Dynamometers: Used to measure the performance of electric motors.
Key Measurements
| Measurement | Description |
|---|---|
| Force | The basic push or pull that the dynamo senses. |
| Torque | Rotational force or moment. |
| Power | The rate at which work is done, often calculated by multiplying torque and rotational speed. |
In summary, a dynamo, or more correctly a dynamometer, measures force, moment of force (torque), or power, and this capability makes it incredibly useful in testing and development for engines, motors, and other rotating machinery. As stated in the reference, "the power produced by an engine, motor or other rotating prime mover can be calculated by simultaneously measuring torque and rotational speed".
