Low Speed Dynamometers

High Power, Low Speed Dynamometer

Froude produces low-speed, very high power dynamometers for use with steam turbine and gearbox applications as well as for capital ship and cathedral engines. In fact, we are world leaders in the design and production of large dynamometers for testing piston, turbine and electric prime movers for the marine industry. We have a unique design which allows for simplified maintenance and vastly reduced installation time.

The LS casing is carried on three spherically pivoted struts which incorporate load cells and hydraulic positioning rams, allowing the dynamometer to be quickly and easily coupled directly to the engine. This mechanism eliminates the need for an expensive intermediate drive shaft. As the dynamometer is free to follow the engine, there is reduced axial thrust; hence no special thrust bearing requirements. The lack of conventional trunnion bearings means the associated problem of brinelling due to transmission of engine vibration, has been totally eliminated.

Froude Low Speed Dynamometer

Low Speed Dynamometer Models

Model	Max Speed (RPM)	Torque Nm (lb.ft)	Power kW (BHP)	*Curve Ref
LS115	400	251,330 (185,370)	8,950 (12,000)	Contact Sales
LS115X	650	570,000 (420,510)	14,920 (20,040)	Contact Sales
LS130	350	356,038 (262,600)	11,185 (15,000)	Contact Sales
LS180	300	990,000 (730,000)	22,500 (30,200)	Contact Sales
LS245	200	2,990,000 (2,202,000)	48,500 (65,000)	Contact Sales
LS295	150	3,944,000 (5,347,900)	48,500 (65,000)	Contact Sales
LS320	130	6,725,767 (4,961,000)	48,500 (65,000)	Contact Sales
LS370	130	6,725,767 (4,961,000)	75,000 (100,500)	Contact Sales
LS370X	200	6,725,767 (4,961,000)	75,000 (100,500)

* Regarding Curve References: Contact sales for appropriate power curve, as multiple configurations may be available depending on your requirements.

Low Speed Dynamometer Details

All torque-transmitting components are assembled using the oil injection technique, eliminating stress raising keys, keyways and associated operating problems of fretting. This technique also assures that subsequent removal of components, even after many years of service, is simple, quick and non destructive. The shaft assembly is carried in standard grease lubricated rolling element bearings, without separate thrust bearings, enabling higher speeds to be achieved without the need for special bearings and/or lubrication systems.

The design power range from 8,950 kW to 100,000 KW is limited solely by the power and torque output of current prime movers. The LS, RLS & DLS designs encompass a range of single and double working compartment machines to match power, torque and speed ranges and offer direct/non direct reversing to your requirements.

Main Features:

Torque measurement accuracy ±0.25% of full rated torque of dynamometer
Speed measurement accuracy ±1 RPM
Servo load control
Rapid response
Stable operation
High reliability
Easy maintenance

The range of low speed dynamometers, introduced in January 1978 as a replacement for the popular FA range, is designed to test low speed/high power prime movers. Low speed dynamometers are currently testing turbine, piston and electrical prime movers in environments from open shipyard to enclosed research centers.

Torque measurement accuracy ±0.25% of full rated torque of dynamometer
Speed measurement accuracy ±1 RPM
Servo load control
Rapid response
Stable operation
High reliability
Easy maintenance

Oil lubricated bearings can be supplied for special applications
Shaft couplings can be provided to suit particular requirements
Speed measurement system by encoder for low speed propulsion system development applications
Servo-controlled water inlet valve
Calibration arm and fittings
Calibration proving ring and hydraulic/screw jack system
Alternative paint color

Contact Froude for Information

Contact Froude