27
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.
9
MAGTROL
HD / ED
Maximum Torque
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.
Maximum Rated
Speed for
Dynamometer
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.
TORQUE
SPEED (rpm)
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)
Power Absorption Curves
HD-106
TORQUE
SPEED (rpm)
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)
The power absorption curves
represent the maximum power
(heat) that the dynamometer can
dissipate over time.
HD-100
HD-400
TORQUE
SPEED (rpm)
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)
HD-500
HD-510
TORQUE
SPEED (rpm)
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)
HD-505
HD-515
TORQUE
SPEED (rpm)
0
0
48
340
96
680
144
1020
192
1360
240
1700
(oz·in)
(mN·m)
0
5000
10000
15000
20000
25000
30000
TORQUE
SPEED (rpm)
0
0
48
340
96
680
144
1020
192
1360
240
1700
(oz·in)
(mN·m)
0
5000
10000
15000
20000
25000
30000
0
5000
10000
15000
20000
25000
30000
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
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