Motor Shaft Conversion Load Torque - Mitsubishi Electric MELDAS MDS-B-SVJ2 Series Specifications And Instruction Manual

11-6 Motor shaft conversion load torque

The main load torque calculation expressions are shown below.
Type Mechanism
Z
2
Linear
Servo-
movement
motor
Z
1
Rotary
movement
Z
1
Servomotor
1/n
Vertical
movement
Guide
Chapter 11 Selection
T
L
F
η
0
F
C
W
F in the above expression is obtained from the lower expression
when the table is moved as shown on the left.
F = Fc + μ (W · g · F
T
T
L
LO
Z
2
Servomotor
When rising
When lowering
T
U
Counter-
T
F
weight
W
2
Load
W
1
Calculation expression
V
F
· (
=
) =
3
πη
N
2×10
T : Load torque
L
F : Force in axial direction of linear motion
machine
η : Drive system efficiency
V : Speed of linear operation object
N : Motor speed
Δ
S: Object movement amount per motor rotation
Z , Z : Deceleration ratio
1 2
)
0
Fc : Force applied on axial direction of moving section (N)
F : Tightening force on inner surface of table guide (N)
0
W : Total weight of moving section
g : Gravitational acceleration
μ : Friction coefficient
Z 1
1
= · · T + T =
LO F
η
Z
2
T : Load torque
L
T : Load torque on load shaft
LO
T : Motor shaft conversion load friction torque
F
η
: Drive system efficiency
Z , Z : Deceleration ratio
1 2
n : Deceleration rate
T = T + T
L U F
· η 2
T = –T + T
L U F
T : Load torque
L
T : Unbalanced torque
U
T : Friction torque on moving section
F
− W
(W ) · g
V
1 2
· (
=
3
2 × 10 πη
N
μ · (W
) · g · △S
+ W
1 2
=
2 × 10 3 πη
W : Load weight
1
W : Counterweight weight
2
η : Drive system efficiency
g : Gravitational acceleration = 9.8
V : Speed of linear operation object
N : Motor speed
△S: Object movement speed per motor rotation
μ : Friction coefficient
11-20
F·△S
3 πη
2×10
(N·m)
(N)
(%)
(mm/min)
(r/min)
(mm)
1 1
· · T + T
LO F
η
n
(N·m)
(N·m)
(N·m)
) · g · △S
(W – W
1 2
) =
2 × 10 3 πη
(kg)
(kg)
(m/sec
(mm/min)
(r/min)
(mm)
(kg)
2
(m/sec )
(N·m)
(N)
(N·m)
2
)