Eddy Current Adjustable Dynamometer

"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 seperate solid state controller. POWERMAG eddy current adjustable dynamometer absorb power, torque and speed characteristics with a unique hyteresis 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 motor 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. 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 test stands of all kinds, when equipped with them carry out various dynamic characteristic tests and operating mode tests of all type of electric motors, engines and other rotating machinery's.

Applications

POWERMAG eddy current adjustable dynamometer are widely used in technical education institutions, research and development laboratories, quality control in industry, defence organisations... 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 machinery's.

Unique Features

POWERMAG eddy current adjustable dynamometer posseses 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 contact. This eliminates the main cause of wear. Further, the stationery coil is protected against adverse atmospheric conditions, the use of commutators, brushes and sliprings is avoided, control is affected 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.

FEATURES	BENEFITS
Torque is transmitted by a magnetic field without friction or wear	Eliminates mechanical contact and shock loading to the prime mover. Providing loger life.
Simple design - Dynamometer and small solid state controller	No 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 power	No need for costly, full power conversion units.
One year warranty.	Built to give long, reliable, low cost life in motor testing applications.

Standard Accessories

      All POWERMAG eddy current adjustable dynamometer come 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.

Specifications

Dynamometer
KW/HP	0.2 KW/0.5 HP to 110 KW/100 HP
Open Ventilated	Standard
Stationery coil	Standard
Class "B" Insulation	Standard
Stationery coil	Standard
Epoxy protection on coil	Standard
Coil volatages	0-80 V DC Standard
0% - 100% constant or variable torque loads	Standards
AC Tachometer generator	Standard

Solid State Electronic Controller
Input Power	220 V AC 50 Hz Single Phase
Wall mounted enclosure	Standrard
Panel mounting	Optional
Output voltage, current dynamometer stationery field coil	0 to 80V DC 2.5 Amps. / 5 Amps
Adjustable Potentiometer	To vary 0% - 100% torque load in KGM - Std.
RPM Meter	Digital RPM indication standard
Power ON/OFF selector switch	Standard
Power 'ON' Indication lamp	Standards
Protective Features	Input 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 adjustable dynamometer also offered with torque sensors and digital torque indication meter for testing virtually all type of electric motors, engines and rotating machinery's.

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