Dynamometers, also known as dynomometers, dynometers, dynos and, within context, motor testers, are devices that measure force, horsepower, maximum rotary speed or maximum power absorption. Most often, they test and measure the forces produced by an engine. One of the earliest dynamometers, the de Prony brake, was invented in 1821 by Gaspard de Prony. Since that time, in stride with advancements in machining processes, design, material availability and technology, dynamometers have become far more complex. Today, they are available in a variety of shapes and sizes, designed to meet usage and placement requirements. Common applications for dynamometers include: RPM and torque measurement of chain or belt drives, fluid power systems, diesel or gas systems, gearboxes, turbines and other engines used in aircraft, aerospace, marine, automotive and industrial processes.
Dynamometers use a variety of devices to take measurements. For example, many dynamometers use small instruments made only of a transducer, strain gauge and display screen. These devices turn torque force into an electrical signal that they can amplify, convert and display as a measurement. Other dynos use motor testers, which work by using voltage and current probes bound to motor input wires to connect the system to internal voltmeters, ammeters and ohmmeters. Motor testers may be used to determine direction, torque, voltage, power, current, cut-out speed and efficiency. Still others use a non-contact speed sensor that can measure motor shaft speed and thereby ascertain its number of rotations per minute. Read More…
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