15. USING A LINEAR SERVO MOTOR
15 - 27
15.4.3 Dynamic brake characteristics
POINT
Do not use dynamic brake to stop in a normal operation as it is the function to
stop in emergency.
For a machine operating at the recommended load to motor mass ratio or less,
the estimated number of usage times of the dynamic brake is 1000 times while
the machine decelerates from the rated speed to a stop once in 10 minutes.
Be sure to enable EM1 (Forced stop 1) after the linear servo motor stops when
using EM1 (Forced stop 1) frequently in other than emergency.
The approximate coasting distance from when the dynamic break is activated until when the linear servo
motor stops can be calculated with the equation below.
Lmax = V
0
• (0.03 + M • (A + B • V
0
2
))
Lmax: Coasting distance of the machine [m]
V
0
: Speed when the brake is activated [m/s]
M: Full mass of the moving part [kg]
A: Coefficient (Refer to the following tables.)
B: Coefficient (Refer to the following tables.)
Linear servo motor Coefficient A Coefficient B Linear servo motor Coefficient A Coefficient B
LM-H3P2A-07P-BSS0 7.15E-03 2.94E-03 LM-U2PAB-05M-0SS0 5.72 × 10
-2
1.72 × 10
-4
LM-H3P3A-12P-CSS0 2.81E-03 1.47E-03 LM-U2PAD-10M-0SS0 2.82 × 10
-2
8.60 × 10
-5
LM-H3P3B-24P-CSS0 7.69E-03 2.27E-04 LM-U2PAF-15M-0SS0 1.87 × 10
-2
5.93 × 10
-5
LM-H3P3C-36P-CSS0 7.22E-03 1.13E-04 LM-U2PBB-07M-1SS0 3.13 × 10
-2
1.04 × 10
-4
LM-H3P3D-48P-CSS0 1.02E-03 2.54E-04 LM-U2PBD-15M-1SS0 1.56 × 10
-2
5.18 × 10
-5
LM-H3P7A-24P-ASS0 7.69E-03 2.14E-04 LM-U2PBF-22M-1SS0 4.58 × 10
-2
1.33 × 10
-5
LM-H3P7B-48P-ASS0 9.14E-04 2.59E-04 LM-U2P2B-40M-2SS0 1.47 × 10
-3
1.27 × 10
-5
LM-H3P7C-72P-ASS0 7.19E-04 1.47E-04 LM-U2P2C-60M-2SS0 1.07 × 10
-3
7.66 × 10
-6
LM-H3P7D-96P-ASS0 6.18E-04 9.59E-05 LM-U2P2D-80M-2SS0 9.14 × 10
-4
5.38 × 10
-6
Linear servo motor Coefficient A Coefficient B Linear servo motor Coefficient A Coefficient B
LM-FP2B-06M-1SS0 8.96 × 10
-4
1.19 × 10
-3
LM-K2P1A-01M-2SS1 5.36 × 10
-3
6.56 × 10
-3
LM-FP2D-12M-1SS0 5.55 × 10
-4
4.81 × 10
-4
LM-K2P1C-03M-2SS1 1.17 × 10
-3
3.75 × 10
-4
LM-FP2F-18M-1SS0 4.41 × 10
-4
2.69 × 10
-4
LM-K2P2A-02M-1SS1 2.49 × 10
-2
1.02 × 10
-3
LM-FP4B-12M-1SS0 5.02 × 10
-4
4.36 × 10
-4
LM-K2P2C-07M-1SS1 6.85 × 10
-4
2.80 × 10
-4
LM-FP4D-24M-1SS0 3.55 × 10
-4
1.54 × 10
-4
LM-K2P2E-12M-1SS1 5.53 × 10
-4
1.14 × 10
-4
LM-FP4F-36M-1SS0 1.79 × 10
-4
1.36 × 10
-4
LM-K2P3C-14M-1SS1 2.92 × 10
-4
1.16 × 10
-4
LM-FP4H-48M-1SS0 1.15 × 10
-4
1.19 × 10
-4
LM-K2P3E-24M-1SS1 2.53 × 10
-4
5.52 × 10
-5
LM-FP5H-60M-1SS0 1.95 × 10
-4
4.00 × 10
-5
CAUTION
The coasting distance is a theoretically calculated value which ignores the
running load such as friction. The calculated value is considered to be longer than
the actual distance. However, if an enough breaking distance is not obtained, the
linear servo motor may crash into the stroke end, which is very dangerous. Install
the anti-crash mechanism such as an air brake or an electric/mechanical stopper
such as a shock absorber to reduce the shock of moving parts. No linear servo
motor with an electromagnetic brake is available.
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