Eddy Current & AC DYNO mite Absorber s

DYNOmite Eddy Current Absorbers offer very quick load control, moderate inertia, and high specific load capacity, especially in the lower RPM working ranges of most industrial-type engines. For applications that do not require stall speed loading, an air-cooled eddy current absorber is usually the most cost-effective electric absorber you can buy. Their self-cooled rotors require no external water supply or resistor banks. They also cost less than planetary-driven water brakes and allow far more design flexibility than hydraulic pumps. For those applications that demand higher RPM limits, lower system inertia, and/or temperature independence, we offer (slightly more expensive) water-cooled eddy current absorbers.

AC (Alternating Current) Absorbers deliver the ultimate in electronic load control. Besides lightning-fast response, they are capable of providing full torque loading all the way down to zero RPM (which is especially important for testing of electric motors). Moderate power applications are configured to dissipate their energy into larger external resistive load banks, while for very low power testing, heat dissipation can sometimes be handled by the drive’s internal braking resistors. For high-power applications, in the 200 Hp to 1,250+ Hp range, a regeneration system that sends the power back into the utility’s grid (often for a credit on the user’s electric bill) will be custom engineered. Most of our AC dyno applications can optionally be configured to “motor” your test engine. In addition to its providing a convenient way to start up the engine, motoring allows testing its internal frictional cranking loads.

Battery powered (12-volt DC) eddy current absorbers are available for in-field service/testing applications. Everything, including the absorber, load control, and DYNOmite data-acquisition computer, can be run off of a large truck battery. Combine this with your laptop computer, running DYNO-MAX 2000™ software, to run a laboratory-like dynamometer test session… almost anywhere on the planet.

120-volt and 240-volt (input) power supply/controls are available to provide 96 or 192-volt DC PWM (pulse width modulated) output – which is suitable for many DYNOmite or third party absorber models. Loading when using these controls is adjustable – either manually (using either its panel knob or the built-in 0-10 volt analog control input) or automatically via digital PID output leads from the DYNOmite data-acquisition computer. Panel circuit breakers are matched to the customer’s application, protecting the absorber’s windings.

Perfect for torque reaction cradles where the higher inertia of an electronic absorber (compared to that of a water brake) is not an issue. Our “Micro” and “Mini” DYNOmite Eddy Current Absorbers are equipped with an eccentric cam mounting body that helps to easily adapt them to changes in drive gear, pulley, or sprocket center distances.

Shaft, Flange, or NEMA Frame mounting choices are offered in various models. The keyed shaft units are most commonly supported between a pair of pillow block bearings. This allows reading the reaction torque via a load cell that is linked to the absorber’s trunnioned frame. Alternatively, optional flat-flange models couple with matching bolt-pattern driveshaft U-joint assemblies. Larger absorbers have a set of mounting holes in their housings for fixing them to the dynamometer’s stand or to a reaction cradle/table. The AC absorbers are available in standard NEMA frame and in input shaft configurations.

Custom hybrid configurations can can also be designed using a combination of both an electronic, typically AC, absorber (for fast torque control) and a large water brake (for inexpensively adding very-high test power capacity). Control of the pair is handled via DYNO-MAX 2000 “Pro.” While their complexity is typically only justified for some sophisticated high-output applications, hybrids make it possible to cost effectively build lower inertia and faster response dynamometers, (with motoring capabilities) than can be had using any single braking technology alone.

High speed spindle bearings and their grease seals provide extra long life for extended industrial or OEM endurance testing applications. Our larger eddy current absorbers feature Zerk grease fittings for easier maintenance, while AC models boast sophisticated self- protection systems. Most replacement bearings and their seals are available locally, and they are engineered for convenient field replacement. These features are combined into a design which minimizes the number of moving wear parts, rendering expensive downtime a non-issue.

Need parts for an old eddy-current dyno? As a manufacturer of eddy-current dyno absorbers, we can often repair otherwise obsolete units. L&S does everything, from modernizing power supplies and controls to custom winding replacement coils for “Brand-X” dynamometers.

Call for immediate assistance in developing your own unique testing solution - or e-mail tech@land-and-sea.com for a prompt response.

Free DYNO-MAX 2000™ "Pro" Demo Tour

Free DYNO-MAX 2000 "Pro+" Multimedia Demo Tour... shows how our optional software turns any PC or Laptop into a dynamometer console! Demonstrates real-time engine displays and controls, Formula Editor, graphing of multiple pulls, and Smart Print™ engine report generation. Either download this interactive demo online, or call and we will mail it to you on CD-ROM.