• Powder Dynamometers, as their name suggests, contain magnetic powder in Dynamometer. The electrical current passing through the coil generates a magnetic field, which changes the property of the powder, from free flowing condition at no excitation to solid rock condition at full excitation. Thus producing a smooth braking torque through friction between rotor and stator – proportional to excitation. The Powder Dynamometers produces their rated torque at zero speed. The element to be tested can be loaded at standstill to determine the starting torque. Powder Dynamometer achieves at low control power, a high torque being independent from the slip speed. It distinguishes itself by a simple construction, low weight and small required space. By changing the exciting power force, the torque to be transmitted can be adjusted infinitely variable in the range 1:50.

• A simple eddy current adjustable dynamometer, is dynamic load system for accurate testing applications of all type of electric motors, engines and other rotating machinery's. The need for dynamic load system which allows flexibility of applications in an economical way has been felt for a long time in technical education institutions, research and development laboratories, quality control in industry, defence organisations. Eddy Current adjustable Dynamometer provides the ideal solution for accurate analysis of Power, Torque, Speed, Fuel and Lubrication consumption and quick pass / fail testing of all type of Electric Motors, Engines and other Rotating Machineries.

APPLICATION SYSTEMS

The primary elements of adjustable dynamometer are an eddy current clutch and separate solid state controller. Eddy current adjustable dynamometer absorbs power & measures Torque and Speed characteristics with a unique braking system, which provides frictionless Torque loading (0% to 100% ) constant / variable torque load) independent of shaft speed. Torque is transmitted by a magnetic field without friction or wear. It eliminates mechanical contact and shock loading to the prime mover, Providing longer life.

Eddy Current Dynamometer has Ferro- magnetic, Spoke structured – Low inertia - Pole is surrounded by stator plates. & excitation coil is placed around stator & Pole. The motor under test, suitably arranged on a common bed. Until the pole structure is energized by stationary excitation coil, the Pole rotor can spin freely on its shaft bearings. When a magnetizing force from the field coil is applied to the pole structure, the air gap becomes a flux field and the rotor is magnetically restrained, providing a braking action between pole structure and stator plates.

Eddy current adjustable dynamometer possesses certain unique features, which gives it a clear advantage over conventional loading systems. Ruggedness and Reliability. Eddy current adjustable dynamometer functions without the need for mechanical contact. This eliminates the main cause of wear. Further, the stationery coil is protected against adverse atmospheric conditions, the use of commutators, brushes and slip rings is avoided, control is affected at a relatively low power level. Electronic controller provides finger-tip operation and flexible control of the eddy current dynamometer from 0% to 100% torque load.

Advantage of Powder Dynamometer is that it controls Torque right from Zero RPM but has poor heat dissipation capacity, whereas Eddy Current Dynamometer operating range is 500 RPM onwards to 18000 /30000RPM, but below 500 RPM it doesn’t produce rated braking torque. Hence we have offered Tandem Dynamometer – At lower speed - Powder Dynamometer will be in operation whereas at higher speeds Eddy Current Dynamometer will be in use. Powder Dynamometer & Eddy Current Dynamometer are constructed in line.