Dynamometers & Dynamometer Manufacturers
Dynamometers, which are also known as dynomometers, dynometers and dynos, are devices that measure the force generated by something, usually an engine. They can also be used to determine horsepower, maximum rotary speed and maximum power absorption. They are sometimes called motor testers when used for these purposes, though the term “motor tester” is frequently used in reference to electric motor diagnostic equipment.
They come in a variety of shapes and sizes, both of which are determined based on usage and placement of the equipment. The two main types are engine dynamometers and chassis dynamometers. Both are widely used by the automobile industry as well as in industrial and manufacturing plants. Some dynamometers are torque testers; torque testers are usually stationary rollers on which the wheels of a vehicle are placed. The rotation of the vehicle’s wheels is then measured by the rollers. The results of such tests vary in accuracy; some can have a margin of error that is less than one percent. Chassis dynamometers are usually 15% to 20% lower in their measurements than other devices because some energy is lost as it travels through the drivetrain. Brake testers are a type of dynamometer used to measure the effectiveness of vehicle brake systems. They should not be confused with brake dynamometers, which are so named because of the process by which they measure performance. Other special dynamometer configurations include PTO dynamometers, hydraulic dynamometers and eddy current dynamometers. Typical applications for dynamometers include measuring torque and RPM on chain or belt drives, gearboxes, fluid power systems, gas or diesel systems, transmissions, turbines and other engines used in automotive, aircraft, aerospace, marine and industrial processes.
Some Leading Manufacturers
Okemos, MI | 517-332-7256
We are a supplier of advanced dynamometer based test systems. We have over 25 years of experience providing quality dynamometers, test cell controls, and ancillary equipment. We provide products for a broad range of industries including automotive, military, heavy equipment, marine, performance racing, and more. We are located in Okemos, Michigan and our administrative, engineering, and manufacturing operations are housed in one facility. To learn more, call us today or visit our website!
Milwaukee, WI | 414-755-0040
At Taylor Dynamometer, we are more than just a dynamometer manufacturer; we are a company committed to solving problems, driving productivity, and serving our customers with truly exceptional products and services. With experience dating back to the 1920s, we have the technical knowledge, expertise, and proven product line to provide you with the dynamometer solutions you need. Everything we do is about making it easy for you to turn your testing challenges into success!
Novi, MI | 248-579-4295
Our goal at Go Power Systems is to provide you with the very best engine-testing equipment at affordable prices. We have over 50 years of experience in the dynamometer industry, and we have a variety of dynamometer solutions to meet your engine testing requirements. We offer small engine dynos, gasoline engine dynos, and diesel engine dynos. We also provide refurbished and rental dynamometers as well as dyno stands. For the best engine-testing equipment, look no further than Go Power Systems!
Jupiter, FL | 561-320-9162
We have a reputation for superior strength, reliability, and quality! We offer a comprehensive of range force measurement devices and dynamometers. Our products are used worldwide in industries like lifting applications, telecommunications, aviation, military, public utilities, and lift maintenance. We are an ISO 9001:2008 certified company and dedicated to providing our customers with quality products! Please contact us today via phone or through our website to learn more!
South Haven, MI | 269-639-7229
Here at Application Engineering, we are committed to manufacturing top of the line dynamometers and engine testing equipment. We manufacture several types of engine dynamometers, including tabletop dynamometers for small engines and horizontal and vertical eddy current dynamometers for larger engines. Our dynamometers are integrated into convenient, mobile test stands to help maximize engine dynamometer up time. Contact us today to see how we can serve you!
Dynamometers take measurements in many different ways. Some varieties can be small instruments composed simply of a transducer, a strain gauge and a display screen. In such devices, the force of the torque is transformed into an electrical signal that is amplified, converted and displayed as a measurement. Other motor testers work by using voltage and current probes attached to input wires of the motor to connect internal voltmeters, ammeters and ohmmeters to the system. Some use a non-contact speed sensor to measure the motor shaft speed and determine the number of rotations per minute. Other options and parameters include a load point test where the motor is tested while under a full load, no load or a locked rotor. Direction, torque, current, voltage, power, efficiency and cut-out speed may be determined by motor tester equipment because of the range of available options that meet the variety of needs. Brake testers are used to check vehicles for brake defects, to verify the effectiveness of repair work, to perform regular safety audits and to test vehicles that have been involved in accidents to determine if their brake systems were functioning at the time of the crash.
Dynos are used in many applications because of the variety of models and variations. Chassis dynamometers measure an engine’s torque output at the wheels of an automobile. The vehicle is placed on rollers that turn the wheels at a certain speed. The RPM of the rollers allows a computer to calculate the torque of the engine. Inertia dynos are a kind of chassis dyno that work the same way and are particularly useful for back-to-back runs after changes and improvements have been made to the engine. Hydraulic dynamometers are machines that measure the power of an engine by using a cell filled with liquid to increase its load; they are also a subset of chassis dynos. Engine dynamometers are the other main kind of dynamometer. They require that the engine be removed from a vehicle and are therefore widely used by automobile manufacturers, engine rebuilders, and producers of high-performance vehicles such as race cars. Engine dynamometer tests produce accurate and repeatable results. A brake dynamometer takes measurements by applying variable loads to the engine and observing how the engine maintains the RPM as the braking force attempts to slow it down. Eddy current dynamometers are a type of brake dynos that use a conductor passing through a changing magnetic field to generate a circulating flow of electrons that moves in opposing directions from the movement of the disk, creating a repelling or dragging force between the conductor and the magnet.
One of the earliest dynamometers was the de Prony brake, invented by Gaspard de Prony in 1821. Since then, advancements in technology, materials, machining processes and design have led to much more advanced dynamometer systems. Demand for a machine that could take accurate readings of torque led the way for developments and innovations; today’s dynos are complex assemblies that can measure performance very accurately. Depending on context, a dynamometer can be very complex or very simple. Chassis dynamometers, for example, are designed for ease of use. A vehicle drives up onto the frame, is strapped in and is ready to begin testing. A computer is used to start the engine and to bring it through the stages of the test. Depending on the software, the progress and results can be charted on a graph or displayed on a screen. Operators may need to be trained in order to learn the software program and to correctly interpret the results. Engine dynos, on the other hand, take the measurements straight from the engine, which requires a different set of equipment. Again, computers are essential for gathering information and reading it. Though some analog dials and gauges are used, they do not report the final measurement. As dynamometers become more automated, the degree of human error decreases and measurements become faster and more accurate. For this reason, dynamometers are helping to improve the world’s understanding and use of engines.