Land & Sea’s Air-Cooled Eddy-Current Absorber (brake) and Electronic Control kits offer an affordable way to build your own state-of-the-art, industrial-duty engine or chassis dynamometer. They are also ideal for restoring obsolete (or upgrading inertia-only) dynamometers.
“Do you have a custom dynamometer application? We manufacture many eddy-current units in-house – so give us a call!”
DYNOmite Air-Cooled 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. Its self-cooled rotors require no external water supply or resistor banks. It also costs less than our planetary-driven water brakes and allows 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) liquid-cooled eddy-current absorbers. See Specifications or Models and Prices pages.
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 – both manually (using either its panel knob or the built-in
0-10 volt analog control input) or automatically via the (non-analog)
PID-controlled leads from the DYNOmite data-acquisition computer. Panel
circuit breakers are matched to the customer’s application, protecting
the absorber’s windings.
MAX –
How Eddy-Current Absorbers Work - Animated look at how eddy-current absorbers create load (MAX narrated).
Special battery-powered (12-volt DC)
eddy-current absorbers are available for your 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™ software, to run a laboratory-like dynamometer test session…
almost anywhere on the planet. Generator-based systems are also
available, for performing longer duration testing than batteries may
allow.
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 the drive-gear, pulley, or sprocket-center distances. Watch Micro-Eddy video!
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 has been linked to the absorber’s trunnioned frame. Alternatively, optional flat-flange models couple to 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.
MAX –
Mounting the Absorber - Animated look at the pros and cons of various absorber-mounting options (MAX narrated).
Need parts for an old eddy-current
dyno? As a manufacturer of eddy-current dyno absorbers, we can
often repair otherwise obsolete units. Land & Sea does everything, from
modernizing power supplies and controls to custom winding replacement
coils for “Brand-X” dynamometers. Call for a quote, or help, in
repairing your existing dyno’s hardware, or replacing a Frenelsa, Klam,
Kloft, Telma retarder.
Custom
hybrid configurations can be designed using a combination of both a fast
electronic absorber, typically an AC motor for great low-end torque
control, together with a large eddy-current absorber. The latter
inexpensively adds testing power and torque capacity. Control of the
pair is handled via DYNO-MAX “Pro.” While this complexity is only
justified for some unique applications, such hybrids make it possible to
cost-effectively build high- torque and faster-response dynamometers –
than is practical using any other single-unit technology.
An AC absorber
can also add motoring ability. Please call for more information.
High-speed spindle bearings and the absorber’s 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. Most of these units’ replacement
bearings and their grease seals are available locally, and are
engineered for convenient in-field replacement – with conventional
tools. These features are combined into a well-proven design – and one
which strives to minimize both the cost and quantity of any,
proprietary, moving wear parts. The end result is that costly
testing-equipment maintenance and downtime becomes a non-issue.
Call for immediate assistance in developing your own unique eddy-current absorber testing solution - or e-mail tech@land-and-sea.com for a prompt response. We have years of wide-ranging experience building one-off testing solutions or retrofitting older hardware with modern load control.
*Actual air-cooled eddy current capacities are RPM and absorber temperature dependent. Initial cold rotor torque (foot-pounds) and power (Hp) curves are for room-temperature rotors. Warm curves are after running about 1+ minutes, at full load, in a room temperature environment. Hot (near continuous) curves assume appropriate forced ventilation to rotors.
