37
Magtrol Hysteresis Dynamometers
Chapter 4 – Testing
OPERA
TION
• Maximum brake temperature = 100 °C (212 °F)
• Maximum rotor temperature = 460 °C (860 °F)
• Ambient temperature = 25 °C (77 °F)
• The dynamometer cooling system is running
The following values are sufficiently accurate (within 1%) to establish watts (W) for use in the heat
rise curves.
where P = power (watts), T = torque, and n = speed (rpm)
P (watts) = T (N·m)
× n (rpm) × (1.047 × 10
-1
)
P (watts) = T (lb·in)
× n (rpm) × (1.183 × 10
-2
)
P (watts) = T (kg·cm) × n (rpm) × (1.027 × 10
-2
)
Note:
Please take a moment to familiarize yourself with any limitations
that may apply to your specific dynamometer and motor testing
requirements.
www.magtrol.com
DATASHEET
Page 11 / 16
© 2016 MAGTROL | Due to continual product development, Magtrol reserves the right to modify specifications without forewarning.
HD
SERIES
POWER ABSORPTION CURVES
Maximum Rated
Speed for
Dynamometer
Maximum Kinetic
Power Rating Curve for
Continuous Duty: Area
under curve equals the
maximum speed and
torque combinations for a
continuous duty motor test.
0
6000
12000
18000
24000
30000
36000
0
0
0.5
3.6
1
7.2
1.5
10.8
2
14.4
2.5
18
(oz·in)
(mN·m)
TORQUE
SPEED (rpm)
Maximum Kinetic Power Rating
Curve for Less Than Five Minutes:
Area under curve equals the
maximum speed and torque
combinations for a motor test of
less than five minutes.
Maximum Torque
for Dynamometer
HD-106
HD-100
HD-400
0
6000
12000
18000
24000
30000
36000
0
0
0.5
3.6
1
7.2
1.5
10.8
2
14.4
2.5
18
(oz·in)
(mN·m)
TORQUE
SPEED (rpm)
The power absorption curves
represent the maximum power
(heat) that the dynamometer can
dissipate over time.
0
5000
10000
15000
20000
25000
30000
0
0
2.2
16
4.4
32
6.6
48
8.8
64
11
80
(oz·in)
(mN·m)
TORQUE
SPEED (rpm)
0
5000
10000
15000
20000
25000
30000
0
0
8
56
16
112
24
168
32
224
40
280
(oz·in)
(mN·m)
TORQUE
SPEED (rpm)
HD-500
HD-510
0
0
24
170
48
340
72
510
96
680
120
850
(oz·in)
(mN·m)
0
5000
10000
15000
20000
25000
30000
TORQUE
SPEED (rpm)
0
5000
10000
15000
20000
25000
30000
0
0
24
170
48
340
72
510
96
680
120
850
(oz·in)
(mN·m)
TORQUE
SPEED (rpm)
Figure 4–1 Power Absorption Curve Parameters
HD-106
Shaft Diameter
0.1245 in / 0.1250 in
(3.163 mm / 3.175 mm)
Shaft Height
3.50 in (88.9 mm)
Torque Range
2.50 oz·in
180.0 g·cm
18.00 mN·m
Input Inertia
7.04 × 10
-7
lb·ft·s²
Maximum Speed
30,000 rpm
Maximum Input Power
continuous duty: 7 W
< 5 minutes:
35 W
