Magtrol WB Series User Manual page 32

Chapter 1 – Introduction
Tandem Specifications
tanDeM operating principles
Because the characteristics of the WB and PB Dynamometers
are complementary, Magtrol is able to offer them mounted
in a tandem setup. Each dynamometer (WB and PB) can
autonomously operate according to its own characteristics.
tanDeM DYnaMoMeter ratings
Model
2 WB 65 + EK + 1 PB 65
2 WB 65 + EK + 2 PB 65
* Voltage at 20 °C is 30 volts.
Optical Speed Sensor
Each 65 Series Tandem Dynamometer has an optical speed
sensor with a 60-bit pulse wheel delivered as standard.
tanDeM torque–speeD–poWer curves
The diagram below shows the characteristic curves for the 65 Series Tandem Dynamometers.
100
2 WB 65 + EK + 2 PB 65
2 WB 65 + EK + 1 PB 65
10
1
100
6
Drag Torque
Rated Torque
De-energized
N·m lb·ft N·m
25 18.4 0.7
50 36.8 1.2
570 rpm
(TORQUE)
(TORQUE)
1000
An electromagnetic clutch is needed for this application
which automatically switches off at the maximum speed of
the PB Powder Dynamometer and automatically switches on
at zero speed.
Nominal Input Inertia
lb·ft kg·m² lb·ft·s²
-3
6.19 3.19 × 10 2.35 × 10
-3
10.62 3.98 × 10 2.93 × 10
Cooling Water Consumption
For all Tandem models: ≈ 30 l/kWh at ∆t = 30 °C (Metric)
5730 rpm
10,000
Rotation Speed (rpm)
22
Magtrol WB/PB Dynamometers
Rated Rated
Power Speed Speed
kW rpm
-3
12 5730 18,000
-3
12 5730 18,000
≈ 8 gal/kWh at ∆t = 86 °F (US)
18,000 rpm
100,000
M AGTROL
WB/PB 65
Max. Excitation
Current*
rpm A
5
5
100
10
1