19
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 65 Series is particularly intended
* Voltage at 20 °C is 30 volts.
for motors which rotate at high speeds, up to 30,000 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 65 Series Eddy-Current Dynamometers.
10
100
1
0.1
10
100
1
0.1
100
1000
10,000
30,000 rpm
5730 rpm
100,000
Speed Limit f
or
WB
Rotation Speed (rpm)
To
rque (N·m
)
Po
wer (kW
)
2 WB
65 (T
ORQ
UE)
1 WB 65 (T
ORQUE)
2
WB 65 (PO
WER)
1
WB 65 (PO
WER)
Optical Speed Sensor
Each 65 Series WB Dynamometer has an optical speed sensor
with a 60-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)
Model
Rated Torque Drag Torque
De-energized
Nominal Input Inertia
Rated
Power
Rated
Speed
Max. Speed
Excitation
Current*
standard
version
high-speed
version (HS)
N·m
lb·ft
N·m
lb·in
kg·m²
lb·ft·s²
kW
rpm
rpm
rpm
A
1 WB 65
10
7.3
0.1
0.88 0.82 × 10
-3
6.04 × 10
-4
6
5730
30,000
50,000
2.5
2 WB 65
20
14.7
0.2
1.77 1.55 × 10
-3
1.14 × 10
-3
12
5730
30,000
50,000
5
WB 65