THK ET20 Series, Manual

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ET20
Angular Velocity versus Permissible Moment of Inertia Angular Velocity versus Output Torque
Note 1) This graph represents cases where the angular acceleration is 2000°/s
2
.
Note 2) When the ambient temperature is low (below 10°C), the permissible moment of inertia will decrease in the high angular velocity range.
Note 3) When the ambient temperature is low (below 10°C), the output torque will decrease in the high angular velocity range.
Note 4) Please use a safety margin of 1.5 or higher for the output torque.
Motor Shaft Rotation Speed versus Internal Resistance Torque
0.000
0.001
0.002
0.003
0.004
0.005
0.006
0.007
0 50 100 150 200 250
0.0057
0.0027
0.0007
180
Permissible moment of inertia (k
g
·m
2
)
Angular velocity (°/s)
Ambient temperature: 10°C or more
Ambient temperature: Less than 10°C
0.00
0.05
0.10
0.15
0.20
0.25
0.30
0.35
0.40
0 50 100 150 200 250
0.14
0.30
0.03
180
Output tor
que (N
·m)
Angular velocity (°/s)
Ambient temperature: 10°C or more
Ambient temperature: Less than 10°C
Motor Selection Information
Compatible Motors
Note 5) Internal resistance torque increases in low-temperature environments (10°C and below).
Therefore, it is recommended to use a higher safety margin when selecting a product.
0.000
0.005
0.010
0.015
0.020
0.025
0 500 1000 1500 2000
0.016
0.023
0.015
0.008
Inter
nal r
esistance tor
que (N
·m)
Motor shaft rotation speed (min -1 )
Ambient temperature: 10°C or more
Ambient temperature: Less than 10°C
Reduction
ratio
Unit mass (with motor)
(k g )
Unit mass (without motor)
(k g )
Moving part mass
(k g )
Unit inertia
(k g ·cm 2 )
Efficiency Timing pulley Timing belt
1/45 0.52 0.35 0.07 0.004 0.47
P26-1.5GT-3-33F
(Manufactured by Gates Unitta Asia Company)
100.5-1.5GT-3
(Manufactured by Gates Unitta Asia Company)
AC servo motor
Motor rated
output (W)
Flange size
Motor
bracket
YASKAWA Electric
Corporation
Σ
-Vmini
SGMMV–A2 20
25×25 B
SGMMV–A3 30
Mitsubishi Electric
Corporation
MELSERVO J4
HG–AK0236 20
25×25 B
HG–AK0336 30
Stepper motor Flange size
Motor
bracket
ORIENTAL MOTOR CO., LTD. 2-phase PKP214D06* 20×20 A
Note 6) Please select and use a motor that is suited to the usage conditions. The table
shows only a portion of the model numbers for motors. For details regarding model
numbers, please see the catalog for each respective motor manufacturer.
Note 7) If the maximum torque of the installed motor will exceed the permissible input
torque (p. 9), please consider a safety measure to limit the torque.
Note 8) Please select a D-cut type motor output shaft.
Note 9) Installation may not be possible depending on the motor options, so please verify in
advance.
10