14. USING A DIRECT DRIVE MOTOR
14 - 63
(b) Dynamic brake time constant
The following shows necessary dynamic brake time constant
τ
for equation 14.1.
Speed [r/min]
T
ime
co
ns
ta
nt
[
m
s]
0
0
100
200
5
15
20
25
30
300
400
500
006
004
10
002
Speed [r/min]
T
ime
co
ns
ta
nt
[
m
s]
0
0
100
200
70
300
400
500
012
006
018
10
20
30
40
50
60
TM-RFM C20 TM-RFM E20
0
0
10
30
40
50
60
20
012
100
200
300
400
500
Speed [r/min]
T
ime
co
ns
ta
nt
[
m
s]
0
0
60
040
50
100
150
200
70
80
50
40
30
20
10
Speed [r/min]
T
ime
co
ns
ta
nt
[
m
s]
TM-RFM G20 TM-RFM J10
(2) Permissible load to motor inertia ratio when the dynamic brake is used
Use the dynamic brake under the load to motor inertia ratio indicated in the following table. If the ratio is
higher than this value, the built-in dynamic brake may burn. If there is a possibility that the ratio may exceed
the value, contact your local sales office.
The values of the permissible load to motor inertia ratio in the table are the values at the maximum rotation
speed of the direct drive motor.
The value in the parenthesis shows the value at the rated speed of the direct drive motor.
Servo
amplifier
MR-J3W-22B MR-J3W-44B MR-J3W-77B MR-J3W-1010B
Direct drive motor
A-axis B-axis A-axis B-axis A-axis B-axis A-axis B-axis
TM-RFM002C20
100 (300)
100 (300)
TM-RFM004C20
100 (300)
100 (300)
100 (300)
TM-RFM006C20
100 (300)
100 (300)
TM-RFM006E20
100 (300)
100 (300)
TM-RFM012E20
100 (300)
100 (300)
TM-RFM018E20
100
(300)
TM-RFM012G20
50 (300)
50 (300)
TM-RFM040J10
50 (200)
50 (200)
Summary of Contents for MELSERVO-J3W Series
Page 17: ...8 MEMO ...
Page 27: ...1 FUNCTIONS AND CONFIGURATION 1 10 MEMO ...
Page 87: ...4 STARTUP 4 14 MEMO ...
Page 117: ...5 PARAMETERS 5 30 MEMO ...
Page 129: ...6 GENERAL GAIN ADJUSTMENT 6 12 MEMO ...
Page 185: ...10 CHARACTERISTICS 10 8 MEMO ...
Page 241: ...11 OPTIONS AND AUXILIARY EQUIPMENT 11 56 MEMO ...
Page 274: ...13 USING A LINEAR SERVO MOTOR 13 25 1 2 3 4 ...