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14. USING A LINEAR SERVO MOTOR
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14.4.4 Permissible load to motor mass ratio when the dynamic brake is used
Use the dynamic brake under the load to motor mass ratio indicated in the following table. If the load to
motor mass ratio is higher than this value, the dynamic brake may burn. If there is a possibility that the load
inertia moment may exceed the value, contact your local sales office.
The values of the permissible load to motor mass ratio in the table are the values when the linear servo
motor is used at the maximum speed.
Linear servo motor
(primary side)
Permissible load to motor mass ratio
[multiplier]
LM-H3 series 40
LM-U2 series
100
LM-F series
LM-K2 series 50
When actual speed does not reach the maximum speed of the linear servo motor, calculate the permissible
load to motor mass ratio at the time of using the dynamic brake by the following equation. (The upper limit is
300 times.)
Permissible load to motor mass ratio at the time of using the dynamic brake = Value in the table × (Servo
motor maximum speed
2
/Actual using speed
2
)
For example, when an actual using speed is 2 m/s or less for the LM-H3P2A-07P motor (maximum speed:
3.0 m/s), the equation will be as follows. Permissible load to motor mass ratio at the time of using the
dynamic brake = 40 × 3
2
/2
2
= 90 [times]