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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. |
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| 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
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| Specifications |
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| 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 |
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| 1. 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 |
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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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