2-4 Examining operating status
Selection guidelines
2-8
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Apx
Se
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Load torque calculation
Calculate the load torque as follows:
Rotary motion
The rotary torque for the rotating mass W on
the ring of radius r from the center of rotation is
shown in the figure to the right.
T : Rotary torque [N·m]
μ
: Friction coefficient
W : Mass [kg]
r : Average radius of friction side [m]
Linear operation (horizontal operation)
The rotary torque when the mass W moves horizontally due to the screw of pitch P is shown below.
T : Rotary torque [N·m]
μ
: Friction coefficient
W : Mass [kg]
P : Screw feed pitch [m]
Linear operation (vertical operation)
The rotary torque when the mass W moves vertically due to the screw of pitch P is shown below.
T : Rotary torque [N·m]
W : Mass [kg]
P : Screw feed pitch [m]
r
×
W
×
μ
×
8
.
9
=
T
Mass: W
Pitch: P
Friction: μ
π
×
×
×
µ
×
=
2
P
W
8
.
9
T
π
×
×
×
=
2
P
W
8
.
9
T
Pitch: P
Mass: W
Radius: r
Mass: W
Friction: μ
