Magtrol WB Series User Manual page 14

Chapter 1 – Introduction
Specifications
eDDY-current DYnaMoMeter operating principles
The WB Eddy-Current Dynamometers develop their full power
at high rotation speeds. The 2.7 Series is particularly intended
WB DYnaMoMeter ratings
Rated Torque
Model
N·m oz·in
2 WB 2.7-8K 0.30 42.4
3 WB 2.7-8K 0.45 63.7
4 WB 2.7-8K 0.60 84.9
* Voltage at 20 °C is 15 volts.
Optical Speed Sensor
Each 2.7 Series WB Dynamometer has an optical speed sensor
with a 30-bit pulse wheel delivered as standard.
WB torque–speeD–poWer curves
The diagram below shows the characteristic curves for the 2.7 Series Eddy-Current Dynamometers.
1000
100
10
100
3
Drag Torque
Nominal Input Inertia
De-energized
mN·m oz·in kg·m²
-5
9 1.27 2.33 × 10
-5
9 1.27 3.18 × 10
12 1.69 4.03 × 10-5 2.97 × 10
1000
Rotation Speed (rpm)
for motors which rotate at high speeds, up to 50,000 rpm. The
braking torque depends on the rotation speed.
Rated Rated
Power Speed
lb·ft·s² W rpm
-5
1.71 × 10 500 15,915
-5
2.34 × 10 750 15,915
-5
1000 15,915
Cooling Water Consumption
For all WB models: ≈ 30 l/kWh at ∆t = 30 °C
15,915 rpm
4 WB 2.7-8-K
3 WB 2.7-8-K
10,000
4
Magtrol WB/PB Dynamometers
Max. Speed
Excitation
Current*
standard version
rpm
50,000
50,000
50,000
≈ 8 gal/kWh at ∆t = 86 °F (US)
50,000 rpm
(POWER)
1000
(POWER)
100
10
100,000
M AGTROL
WB 2.7
A
1.0
1.5
2.0
(Metric)