DYNOmite AC Drives and Absorbers offer precision load control, moderate inertia, combined with motoring ability. They even provide full torque loading down to near zero RPM (or to true zero RPM using their encoder option). A variable frequency AC dynamometer provides the most advanced control and load capabilities that you can buy - without the high inertia and maintenance of DC brushed motor based systems.

Variable Frequency Field Oriented Control is used to vary the test RPM and load. Provides RPM or Torque regulation without requiring a separate feedback encoder. Power produced by the motor while it is operating in generator (load) mode can be dissipated though an air-cooled resistor bank, or returned to the electrical grid via a regeneration unit (thus using the test engine's power to lower your electrical bills)!

115, 208, 230, 460, 600, and 4,000 volt drives either 3-phase or single-phase (for lower voltages) are available with an output frequency range from 0 to 400 Hertz. Drives are available with an integral LCD programming module and readout to aid in filed configuring the drives for custom applications. Multiple 0-10 volt analog and digital inputs and outputs are provided for control and drive feedback (compatible with the DYNOmite-Pro hardware and DYNO-MAX™ software control algorithms). Encoder options (although often unnecessary) are also available. Even digital synchronization between multiple drives (i.e. for AWD chassis dynamometers) is an available add-on.

Drives include on-board speed and torque regulation so only a 0-10v (scalable to 0-5volt, etc.) analog input is required to adjust test speed (or torque loading). For convenience, estimated speed and torque data (calculated from drive's current and frequency control data) can be displayed on the optional LED. This same estimated data is even available as analog 0-10 volt outputs (for data-acquisition applications where the extra precision of actual load cells and frequency counters is not mandatory).

 AC (Alternating Current) Absorbers offer the ultimate in electronic load control. Besides lightning-fast response, these motor/generators can deliver nearly full torque braking all the way down to zero RPM (with optional encoders) - especially useful for testing electric motors, etc. Most of the AC applications can also be designed to “motor” the test engine. In addition to providing a convenient way to start the engine, motoring allows testing its frictional cranking loads.

Capacities from 1/3 to over 4,000 Horsepower, so there is an AC drive and motor/generator combination to suit almost any application. Larger installations can be equipped for regenerative dynamic braking - feeding the engine's horsepower back into the utility's grid, for an electric bill credit!

Many standard NEMA frame and input shaft combinations are availables. Double ended, keyed shaft units can be supported between a pair of pillow block bearings. This allows reading the reaction torque off a load cell linked to the absorber’s trunnioned frame. Larger generator/motors have mounting holes in their frames for fixing them to the dynamometer’s frame or cradle. Units are available in drip proof open frame or sealed housings. Integral heaters can be provided for damp environments to reduce corrosion problems.

High speed spindle bearings and grease seals provide long life - for extended OEM and industrial endurance testing applications. Standard absorbers have speed ranges to 7,800+ RPM Special water-cooled bearing units available in smaller high-speed absorbers to 11,000 RPM.
 

Custom hybrid configurations using a combination of both an AC and Eddy-Current (or water brake) absorber can provide the unique characteristics of each - in a single installation. This means it is practical to have instantaneous control, stability, motoring capability, and high power absorption that would be otherwise unaffordable (or impossible) to duplicate. Control of the pair is done using DYNO-MAX “Pro” software. In very high Hp installations it is possible to reduce, significantly, both the dynamometer’s cost and inertia via this method (compared to an equivalent capacity Alternating Current absorber alone).

Ideal for torque reaction cradles where the higher inertia of an AC absorber (compared to a water brake) is not an issue. Our Reaction Cradle designs easily adapt to changes in drive gear, pulley, or sprocket center distances.

Call for help on your own unique testing situation - or e-mail tech@land-and-sea.com for a prompt response!

Free DYNO-MAX™ "Pro+" Demo Tour

Free DYNO-MAX "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.