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Eddy Current Dynamometer

MANUFACTURER Froude Hofmann (manufacturer's website)
AVAILABILITY Unavailable until September 2012
TRAINING Training is required to use this item and we can arrange this if needed.
CUSTODIAN Adrian Broster
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SITE West Park


The Froude Hofmann AG150HS eddy current dynamometer is rated at 150 kW (200 bhp) and has a maximum operating speed of 12,000 rpm. It is one of a range of dynamometers that have been designed specifically for testing engines and their components in many applications including Research and Development, Quality Audit, Endurance, Production and Overhaul.

AG dynamometers range 30 to 750 kW (40 to 1010 bhp). Power absorption can be in either direction of rotation and standard or high-speed versions are available to meet individual testing requirements. Operating in numerous test cells throughout the world, Froude Hofmann AG dynamometers have demonstrated themselves to be a first class investment providing accurate performance and cost effective, reliable service.


  • ±0.25% FS High accuracy torque measurement
  • ±1 rpm (±1 digit) speed measurement
  • Low inertia
  • Inherent reversibility
  • Two half couplings
  • Detection of cooling water loss / low flow via differential pressure switch and loss plate thermocouples
  • Internal protection against corrosion using electroless nickel plating of loss plate cooling passages
  • Protection against shaft bearing failure using thermocouples
  • Long service life
  • Easy maintenance


Weight (approximately)560 kg (1235 lbs)
Inertia0.093 kg.m^2 (2.21 lbf.ft^2)
Torsional Stiffness (half shaft)0.35 MNm/rad
ColourTraffic Blue - RAL5017


Maximum Power150 kW (200 bhp)
Maximum Torque500 Nm (369 lbf.ft)
Maximum Speed12,000 rpm
Capacity Diagram003798

Measurement Accuracy

Torque± 1.25 Nm (±0.25% of full scale load) *
Speed± 1rpm *

Note: - * with Froude Hofmann Control System.

Environmental Conditions

Operating Temperature-10ºC to 60ºC.
Maximum Humidity90% RH non-condensing.

Note: - At low temperatures the water should be treated to prevent freezing within the machine.

Water Supply

Minimum Flow5,900 l/hour for maximum inlet temperature of 38ºC.
Maximum Outlet Temperature60ºC.
Minimum Supply Pressure1.0 bar.
Note: - The inlet water pressure should not exceed 4.1 bar at any time.
Acidity7.4 to 8.4 pH.
Suspended Particles< 1000 ppm.
Filtration400 microns (400µm).

Item ID #1995.

Last Updated: 1st November, 2012

Eddy Current Dynamometer