Stober 1 Servo Gear Units

PH Series (A, Q, QA): INLINE — Flange Output
PH Series Load/Life/Speed Calculations
The permissible load and tilting moment values are based on an output
speed of 100 RPM. For higher speeds the following applies, where n 2
is the
desired speed:
PH/PHA
F2AX =
PHQ/PHQA
F2AX =
F 2A
F 2A
3
n 2
100
F 2RX
=
F 2R
M 2KX
=
M 2K
3
n 2
100
M 2KX
=
M 2K
All formulas shown are based on METRIC values
Upper case letters are permissible values. Lower case letters are for existing values.
PH/PHA
y 2
–F 2a
+F 2r
+F 2a
3
n 2
100
3
n 2
100
3
n 2
100
–F 2r
z 2
The application output tilting moment should be determined by the
following formula:
Where:
F 2a
F 2A
F 2r
F 2R
F 2RB
2 • F 2a
• y 2
+ F 2rb
• (x 2
+ z 2
)
M 2A
= < M 2KB
1000
3
n 2b1
• t b1
• M 2kb1
3
+...+ n 2bn
• t bn
• M 2kbn
3
M 2ka
= < M 2K
n2b1 • t b1
+...+ n 2bn
• t bn
3
n 2b1
• t b1
• F 2rb1
3
+...+ n 2bn
• t bn
• F 2rbn
3
F 2r
= < F 2R
n2b1 • t b1
+...+ n 2bn
• t bn
Axial Load at Output Shaft
Permissible Axial Load
Radial Load at Output Shaft
Permissible Radial Load
Acceleration Permissible Radial Load
M 2K Rated Tilting Torque
M 2k Equivalent Tilting Load
M 2KB Acceleration Tilting Torque
z 2
Distance Factor
x 2
PHQ/PHQA
–F 2a +F 2a
y 2
+F 2r
–F 2r
z 2
x 2
The hours of life (L h
) of the unit can be determined by the following formula:
bearing life for duty cycle < 40%
L h
> 10,000 hours if M 2K
/M 2A
< 1.25 and > 1
L h
> 20,000 hours if M 2K
/M 2A
> 1.25 and > 1.5
L h
> 30,000 hours if M 2K
/M 2A
< 1.5
bearing life for duty cycle > 40%
L hA
= L h
40%
( Duty Cycle )
52 Servo Gear Units V.28
800.711.3588 • www.stober.com