dynamometers

Pick the best style dynamometer for your application! Each type of configuration has its own strengths and weaknesses. The chart below attempts to point out some of the more significant differences.

Custom hybrid configurations using a combination of both an AC Motor/Generator 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 2000 “Pro” software. In very high Hp installations it is possible to reduce, significantly, both the dynamometer’s cost and inertia via this method.

Feature	*Water Brake Absorbers*	Inertia Rollers	Inertia+ Parasitic Fan/Pump	Eddy Current Absorbers	*Friction* *Brakes*	*Hydraulic Pumps*	*AC Motor- Generators*	*DC Motor- Generators*
High Hp (steady state) capacity?	Excelente	n/a*	Fair (depends on fan size)	Bueno	Pobre (cooling required	Fair (cooler required	Bueno	Fair
High RPM capability?	Excelente	n/a	Fair (fan limited)	Fair	Bueno	Pobre	Fair	Pobre
Low RPM torque (steady state) capacity?	Fair	n/a*	Pobre	Muy Bueno	Excelente	Excelente	Excelente	Excelente
Stall torque (0 RPM range) test capability?	Pobre	Fair (startup only)	Fair (startup only)	Pobre	Bueno	Bueno	Excelente (with encoder)	Excelente (with encoder)
Stability of RPM load control?	Bueno	n/a*	n/a* (exponential fixed curve)	Muy Bueno	Pobre	Fair	Excelente	Muy Bueno
Typical response time to 90% load change?	Bueno (less than 0.5 seconds)	n/a*	n/a* (exponential fixed curve)	Muy Bueno (less than 0.05 seconds)	Pobre (less than 1.0 seconds)	Fair (less than 0.75 seconds)	Excelente (less than 0.005 seconds)	Muy Bueno (less than 0.01 seconds)
Testing simulation under computer control?	Bueno	n/a*	n/a* (exponential fixed curve)	Excelente	Fair	Not typically available	Excelente	Muy Bueno
Motoring capability?	requires separate motor	requires separate motor	requires separate motor	requires separate motor	requires separate motor	requires separate motor	Excelente	Excelente
Suitability to long duration testing?	Excelente	n/a*	Excelente	Excelente(water cooled) Fair (air)	Fair (water cooled)	Bueno (with cooler)	Excelente	Bueno
Ease of engine starting?	requires separate starter	requires separate starter	requires separate starter	requires separate starter	requires separate starter	requires separate starter	Excelente	Excelente
Hp capacity vs. weight?	Excelente	Pobre	Pobre	Fair	Fair	Fair	Pobre	Pobre
Hp capacity vs. size?	Excelente	Excelente	Excelente	Fair	Bueno	Bueno	Fair	Pobre
Portability of absorption unit	Excelente	Determined by weight	Determined by weight	Fair	Fair	Bueno	Pobre	Pobre
RPM, Torque, & Hp Accuracy?	Determined by Data Acquisition	Determined by Data Acquisition	Determined by Data Acquisition	Determined by Data Acquisition	Determined by Data Acquisition	Determined by Data Acquisition	Determined by Data Acquisition	Determined by Data Acquisition
Data Repeatability?	Determined by Data Acquisition	Determined by Data Acquisition	Determined by Data Acquisition	Determined by Data Acquisition	Determined by Data Acquisition	Determined by Data Acquisition	Determined by Data Acquisition	Determined by Data Acquisition
Resistance to hysteresis (breakaway friction)	Bueno	Excelente	Excelente	Muy Bueno	Bueno	Pobre	Muy Bueno	Bueno
Immunity to un-trunioned parasitic drag losses	Excelente (if mounted directly)	Pobre	Pobre	Bueno	Bueno	Fair	Excelente (with in-line transducer)	Excelente (with in-line transducer)
Affordability per Hp (steady state) capacity?	Excelente	n/a*	Fair	Bueno	Fair	Fair	Pobre	Pobre
Installation affordability?	Excelente (if water is available)	Fair (if pit or lift required)	Fair (if pit or lift required)	Muy Bueno (115v AC required)	Bueno (but cooler required)	Bueno (but cooler required)	Bueno (electrician required)	Bueno (electrician required)
Affordability of maintenance?	Excelente	Excelente	Excelente	Excelente	Fair	Bueno	Excelente	Bueno

*n/a - no se aplica, la inercia sólo "dynos" no se puede medir directamente el par o mantener un estado de equilibrio de carga (sin ser
equipadas también con algún tipo de amortiguador y célula de carga o una fuente de los rozamientos parásitos (por ejemplo, un gran
ventilador o con una bomba conocida curva de pérdida). © 10/4/2008

Dynamometer Comparisons

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