Technical data

Manual - Gear Units and Gearmotors
217
11
Abbreviation Key
11
11 Appendix
11.1 Abbreviation Key
a, b, f Constants for converting overhung loads [in]
c Constant for converting overhung load [lb-in]
cosj Power factor of the motor
F
A
Axial load on the output shaft [lb]
f
B
Service factor
f
supply
Mains frequency [Hz]
F
R
Overhung load on the output shaft [lb]
f
T
, f
H
Power reducing factors of the motor
f
Z
Transmission element factor for determining the overhung load
H Installation altitude [ft]
η Forward efficiency
h’ Retrodriving efficiency
h
75%
/h
100%
Efficiency of the motor at 75%/100% rated load
I
A
/I
N
Ratio between starting current and rated current of the motor
I
N
Rated current [A]
IP.. Degree of protection
i
ges
Total gear reduction ratio
i
sch
Helical-worm stage ratio
J
Umg
Ambient temperature [°F]
J
Last
Mass moment of inertia to be driven [lb-ft
2
]
J
Mot
Mass moment of inertia of the motor [lb-ft
2
]
J
X
Mass moment of inertia scaled down to the motor shaft [lb-ft
2
]
J
Z
Mass moment of inertia of the flywheel fan [lb-ft
2
]
T
a
Output torque [lb-in]
T
B
Braking torque [lb-in]
T
H
/T
N
Ratio between acceleration torque and rated torque of the motor
T
A
/T
N
Ratio between run-up torque and rated torque of the motor
n
a
Output speed [rpm]
n
e
Input speed [rpm]
n
M
Motor speed [rpm]
n
N
Rated speed [rpm]
P
a
Output power [HP]
P
e
Calculated drive power of the gear unit [HP]
P
N
Rated power [HP]
S.., %ED Duty type and cyclic duration factor cdf
T Duty cycle time [min]
t1 Brake response time [10
-3
s]
t2 Brake application time [10
-3
s]
U
Brake
Operating voltage of the brake [V]
U
Mot
Operating voltage of the motor [V]
Z Starting frequency [1/h], [c/h]
Z
0
No-load starting frequency [1/h], [c/h]