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“POWERMAG” a simple eddy current adjustable dynamometer, is a totally new concept in dynamic load system for accurate testing appliations of all type of electric motors, engines and other rotating machinery’s.

The need for a dynamic load system which allows flexibility of appliations in an economical way has been felt for a long time in technical education institutes, research and development, quality control in industry, and “POWERMAG” eddy current adjustable dynamometer provides the ideal solution for such applications.

Operating Principle

The primary elements of POWERMAG adjustable dynamometer are an eddy current clutch, a tachometer, and a separate solid state controller. POWERMAG eddy current adjustable dynamometer absorb power, torque and speed characteristics with a unique hystersics braking system which provides frictionless torque loading (0% to 100% constant/variable torque load) independent of shaft speed. The eddy current adjustable dynamometer provides torque by the use of two basic components- a reticulated pole structure with output shaft which connected to the spring balance weighing gear load and a speciality steel rotor drum with input shaft assembly-fitted together but not in physical contact. The prime mover under test suitably arranged on a common bed plate could drive the input. Until the pole structure is energized, the rotor drum 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 rotor drum. A solid state electronic controller is used to excite the field coil. The torque is proportional to coil current. An integral tachogenerator is mounted on the input rotor shaft, to give voltage and frequency proportional to speed, which is used for speed indication (RPM), so that simultaneously torque and speed of the motor can be read under 0% to 100% load test.

POWERMAG eddy current adjustable dynamometer tests of all kinds and when equipped with them carries out various dynamic characteristic tests and operating mode tests of all type of motors, engines and other rotating machineries.


POWERMAG eddy current adjustable dynamometer are widely used in technical education institutions, research & development laboratories, quality control in industry, defence organizations, etc., for accurate analysis of power, torque, speed, fuel and lubrication consumption and quick pass/fail testing of all type of engines, motors and other rotating machinery.

Unique Features

POWERMAG eddy current adjustable dynamometer possesses certain unique features, which gives it a clear advantage over conventional loading systems.

Ruggedness and Reliability

POWERMAG eddy current adjustable dynamometer functions without the need for mechanical contacts. This eliminates the main cause of wear. Further, the stationary coil is protected against adverse atmospheric conditions; the use of commutators, brushes and sliprings is avoided and control is achieved at a relatively low power level.

Ease of Operation

POWERMAG electronic controller provides finger-tip operation and flexible control of the eddy current dynamometer from 0% to 100% torque load.

Torque is transmitted by a magnetic field without friction or wearEliminates mechanical contact and shock loading to the prime mover. Providing loger life.
Simple design – Dynamometer and small solid state controllerNo need of DC generator with resistive load. No need of hydraulic dynamometer systems and related external loading devics like pumping and piping arrangements. No need of any pony brake, water pulley, external colling and canvas belt. Easy to understand, install, operate and maintain.
Fewer Wearing parts – all POWERMAG dynamometers have only four permanently lubricated bearings.Minimum down-time
Stationery coupling coil Eliminates all weak links like commutators, sliprings or brushes enhancing life expectancy.
Controller operates on less than 2% of input powerNo need for costly, full power conversion units.
No need for costly, full power conversion units.Built to give long, reliable, low cost life in motor testing applications.

Standard Accessories

All POWERMAG eddy current adjustable dynamometer comes with

  • 200mm diameter pulley fitted on the output shaft of dynamometer
  • Spring balance weighing gear
  • Love joy couplings to interconnect prime mover and dynamometer
  • MS channel iron base plate to install the dynamometer and the prime mover.
  • Angle iron stands attached with bed plate to install the spring balance weighing gear.
  • Steel rope to interconnect spring balance weighing gear and pulley.


Dynamometer Specifications
Torque4.7Nm to 549Nm 0.48Kg-M to 56Kg-M
RPMUpto 3500 RPM (Max)
Open VentilatedStandard
Stationery coilStandard
Class “F” InsulationStandard
Epoxy protection on coilStandard
Coil volatages0-80 V DC Standard
0% – 100% constant or variable torque loadsStandard Continuous (S1) Duty
AC Tachometer generatorOptional
OverloadUpto 250% Short time
Solid State Electronic Controller
Input Power230 V AC 50 Hz Single Phase
Wall mounted enclosureStandard
Output voltage, current of dynamometer stationery field coil0 to 80V DC 2.5 Amps/5Amps
Adjustable PotentiometerTo vary 0% – 100% torque load in KGM – Std.
Power ON/Off selector switch with IndicationStandard
Protective featuresInput fuses, low line voltage, line transients, isolated signal circuits, maximum torque limit – standard
Power ON/OFF selector switchStandard
Power ‘ON’ Indication lampStandards
Protective FeaturesInput fuses, low line voltage, line tansients, isolated signal circuits, maximum torque limit – standard

POWERMAG offers single and three phase power analysers indicating panel to measure the electrical input power.The power analyser option allows for capturing volts amps,watts, frequency, power factor and temperature rise.

POWERMAG eddy current dynamometer also offered with torque sensors and digital torque indication meter for testing virtually all type of electric motors, engines and rotating machinery’s.