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Eddy Current Dynamometer

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Eddy current dynamometers are a subset of chassis dynamometers and are the most common absorbers, made to fit in most chassis dyno pits. They can also act as brake dynamometers. Read More…

Eddy Current Dynamometer Eddy current dynamometers determine the torque of an engine by creating eddy currents. They are used extensively in the automotive industry to produce braking torque. Also known as eddy current dynos, these devices offer the advantages of low maintenance, high levels of control and simple construction.
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Leading Manufacturers

Owosso, MI  |  989-720-2700

We provide dynamometer test controls and equipment for a wide range of applications. Our test cell control system is compatible with all types of dynamometers, including AC & DC motoring dynos & Water Brake Systems. Our products all include the durability & quality customers expect from SAKOR. Our dynamometers are powerful & affordable for the automotive, aerospace & heavy equipment industries.

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SAKOR Technologies, Inc. $$$

Sturtevant, WI  |  818-746-3649

Phoenix Dynamometer Technologies LLC offers the most comprehensive approach to water re-circulation systems, data acquisition systems, and dynamometers in the industry. Along with these high performance products, we also offer business continuity and a competitive advantage for our customers. Come and experience the kind of service that sets us above our competitors. We would love to serve you today. Call or visit us online!

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Phoenix Dynamometer Technologies LLC $$$

Ann Arbor, MI  |  734-213-6555

Check out the new HORIBA. As HORIBA Automotive Test Systems, we are a leading company in engine, driveline and emissions testing systems, including dynamometers, brake testers and wind tunnel balances testing tools. Plus, HORIBA Contract Testing Services can do the testing for you.

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HORIBA Instruments Inc. $$$

Norwood, MA  |  800-421-0246

Tractel is a leader in the industry featuring agriculture dynamometers, engine dynamometers and electric motor dynamometers for torque measurement. With more than five decades of dynamometer manufacturing and service, Tractel continually strives to better serve the needs of customers. We ensure the right product for any application offering several dyno models and complete turnkey test cells.

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Tractel $$$

Plymouth, MI  |  734-453-0800

Link Engineering is a 65-year-old manufacturer of custom dynamometers—full-scale aircraft inertia dynamometers, automotive dynamometers, brake dynamometers, chassis dynamometers and truck dynamometers. We can also supply you with refurbished brake dynamometers. Our multinational organization serves the passenger car, truck, trailer, bus, motorcycle, aircraft, & off-road vehicle industries.

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Link Engineering Company $$$
placeholder image SAKOR Technologies, Inc. Phoenix Dynamometer Technologies LLC HORIBA Instruments Inc. Tractel Link Engineering Company

Unlike inertia dynos, they are able to provide a quick load change rate as well as steady state and controlled acceleration. Many new eddy current dynamometers use cast iron discs to pass through the magnetic field and form eddy currents. Additional materials include copper, aluminum and other conductive metals.

Variable electromagnets change the strength of the magnetic field in order to control the amount of braking. The electromagnetic voltage is computer controlled to match the changes in the magnetic field to the applied power output.

The range of speed and torque that eddy current dynamometers provide makes these dynos very versatile and ideal for engine testing. They are also useful and effective when testing transmissions, turbines, electric motors, gears, pump and other machines. Dynamometers are used primarily for these purposes and are widespread in manufacturing, production and industrial applications.

Eddy currents are created when a conductor (such as a metal disk) is introduced to a changing magnetic field. A circulating flow of electrons creates its own current within the magnetic field. These currents move in opposing directions from the movement of the disk, creating a repelling or dragging force between the conductor and the magnet.

The strength of the currents and therefore the strength of the repelling action increases when the power of the magnetic field is increased, the electrical conductivity of the disk is greater or when the magnetic field changes quickly.

The torque of the vehicle is determined through the voltage that was required to create eddy currents that were strong enough to match the output of the vehicle. A certain level of voltage indicates a specific amount of torque.

Because eddy currents generate heat, eddy current dynos must be cooled. Most are air cooled but some require external water cooling systems. In other systems, the heat from the currents is used for induction heating. These dynamometers are a heavy duty but cost effective way to produce braking torque. They are also used as load absorbers because they can provide a slight levitation effect or an air cushion to absorb an impact. Because eddy current dynamometers are chassis dynos, they are able to measure torque while the engine is still in the vehicle.

Eddy Current Dynamometers Informational Video

 
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