4
Magtrol WB/PB Dynamometers
Chapter 1 – Introduction
3
MAGTROL
Specifications
WB DYnaMoMeter ratings
The WB Eddy-Current Dynamometers develop their full power
at high rotation speeds. The 2.7 Series is particularly intended
* Voltage at 20 °C is 15 volts.
for motors which rotate at high speeds, up to 50,000 rpm. The
braking torque depends on the rotation speed.
eDDY-current DYnaMoMeter operating principles
WB torque–speeD–poWer curves
The diagram below shows the characteristic curves for the 2.7 Series Eddy-Current Dynamometers.
Optical Speed Sensor
Each 2.7 Series WB Dynamometer has an optical speed sensor
with a 30-bit pulse wheel delivered as standard.
Cooling Water Consumption
For all WB models:
≈
30 l/kWh at
∆
t
= 30 °C (Metric)
≈
8 gal/kWh at
∆
t
= 86 °F (US)
1000
100
10
1000
100
10
100
1000
10,000
50,000 rpm
15,915 rpm
100,000
Speed Limit f
or
WB
Rotation Speed (rpm)
To
rque (mN·m)
Po
wer (W)
4 WB 2.7-8-K (T
ORQUE)
4 WB 2.7-8-K
(POWER)
3 WB 2.7-8-K
(POWER)
3 WB 2.7-8-K (T
ORQUE)
2 WB 2.7-8-K (T
ORQUE)
2
W
B
2.
7-
8-
K
(P
O
W
ER
)
Model
Rated Torque Drag Torque
De-energized Nominal Input Inertia
Rated
Power
Rated
Speed
Max. Speed
Excitation
Current*
standard version
N·m
oz·in mN·m oz·in
kg·m²
lb·ft·s²
W
rpm
rpm
A
2 WB 2.7-8K
0.30
42.4
9
1.27 2.33 × 10
-5
1.71 × 10
-5
500
15,915
50,000
1.0
3 WB 2.7-8K
0.45
63.7
9
1.27 3.18 × 10
-5
2.34 × 10
-5
750
15,915
50,000
1.5
4 WB 2.7-8K
0.60
84.9
12
1.69 4.03 × 10-5 2.97 × 10
-5
1000
15,915
50,000
2.0
WB 2.7