Servomotor series JHN, JHQ, and JL – User Manual
Introduction
Jetter AG
17
Legend
1.7.4
Legend for the formulas for calculating the spindle, rack-and-pinion or belt drive
d
=
Cylinder diameter [mm]
d
1
=
Diameter of driving gear [mm]
d
2
=
Diameter of driven gear [mm]
d
3
=
Pinion or pulley diameter [mm]
F
L
=
Feed force [N]
h
=
Spindle lead [mm]
i
=
Reduction ratio
l
=
Cylinder length [mm]
m
=
Cylinder weight [kg]
m
T
=
Weight of linearly moved parts [kg]
M
B
=
Acceleration, resp. deceleration torque [Nm]
M
D
=
Continuous torque [Nm]
M
I
=
Peak torque [Nm]
M
L
=
Load torque [Nm]
M
M
=
Motor torque [Nm]
M
R
=
Friction torque [Nm]
n
M
=
Motor speed [RPM]
P
A
=
Output [W]
J
=
Mass moment of inertia [kg m
2
]
J
M
=
Motor mass moment of inertia [kg m
2
]
J
R
=
Rotatory mass moment of inertia [kg m
2
]
J
T
=
Translatory mass moment of inertia [kg m
2
]
s
B
=
Acceleration, resp. deceleration distance [mm]
t
B
=
Acceleration, resp. deceleration time [s]
v
=
Feed rate [m/s]
h
=
Mechanical efficiency related to motor shaft
ρ
=
Density [kg/m
3
]
All motor calculations should be carried out on the basis of the most severe operating conditions.
