Magtrol WB Series User Manual page 48

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 15 + EK + 1 PB 15
2 WB 15 + EK + 2 PB 15
2 WB 15 + EK + 4 PB 15
4 WB 15 + EK + 1 PB 15
4 WB 15 + EK + 2 PB 15
4 WB 15 + EK + 4 PB 15
* Voltage at 20 °C is 45 volts.
Optical Speed Sensor
Each 15 Series Tandem Dynamometer has an optical speed
sensor with a 60-bit pulse wheel delivered as standard.
tanDeM torque–speeD–poWer curves
The diagrams below show the characteristic curves for the 15 Series Tandem Dynamometers.
10000
2 WB 15 + EK + 4 PB 15 (TORQUE)
1000
2 WB 15 + EK + 2 PB 15 (TORQUE)
2 WB 15 + EK + 1 PB 15 (TORQUE)
100
10
10 100
Rotation Speed (rpm)
6
Drag Torque
Rated Torque
De-energized
N·m lb·ft N·m lb·in
300 221 8.8
600 442 14.8
1200 885 26.8
300 221 11.6
600 442 17.6
1200 885 29.6
382 rpm 2390 rpm 7500 rpm
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
kg·m² lb·ft·s²
-1
77 1.77 × 10 1.31 × 10
-1
130 2.31 × 10 1.70 × 10
-1
237 3.39 × 10 2.50 × 10
-1
102 2.77 × 10 2.04 × 10
-1
155 3.31 × 10 2.44 × 10
-1
261 4.39 × 10 3.23 × 10
Cooling Water Consumption
For all Tandem models: ≈ 30 l/kWh at ∆t = 30 °C (Metric)
1000 10,000
4 WB 15 + EK + 4 PB 15 (TORQUE)
100 1000
4 WB 15 + EK + 2 PB 15 (TORQUE)
10 100
1
10
10,000 10
38
Magtrol WB/PB Dynamometers
WB/PB 15
Rated Rated Max.
Power Speed Speed
kW rpm rpm
-1
70 2390 7500
-1
70 2390 7500
-1
70 2390 7500
-1
140 2390 7500
-1
140 2390 7500
-1
140 2390 7500
≈ 8 gal/kWh at ∆t = 86 °F (US)
382 rpm 2390 rpm
100 1000
Rotation Speed (rpm)
M AGTROL
Excitation
Current*
A
7.5
7.5
12
12
12
12
7500 rpm
1000
100
10
1
10,000