
15. USING A DIRECT DRIVE MOTOR
15 - 20
(b) Dynamic brake time constant
The following shows necessary dynamic brake time constant IJ for equation 15.1.
Dynamic brake time constant
Speed [r/min]
0
0 100 200
5
15
20
25
30
300 400 500
006
004
10
002
[ms]
Dynamic brake time constant [ms]
0
0 100 200
70
300 400 500
012
006
018
10
20
30
40
50
60
Speed [r/min]
TM-RFM_C20 TM-RFM_E20
ᤨ
ቯ
ᢙ
Ǽ
[ms]
0
࿁ォㅦᐲ[r/min]
0
10
30
40
50
60
072
048
20
012
100 200 300 400 500
ᤨ
ቯ
ᢙ
Ǽ
[ms]
࿁ォㅦᐲ[r/min]
0
0
60
120
040
240
50 100 150 200
70
80
50
40
30
20
10
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 load
inertia moment is higher than this value, the dynamic brake may burn. If the load to motor inertia ratio
exceeds the indicated 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
Direct drive motor
MR-J4-20_ MR-J4-40_ MR-J4-60_ MR-J4-70_ MR-J4-100_ MR-J4-350_ MR-J4-500_
TM-RFM002C20 100 (300) 100 (300) 100 (300)
TM-RFM004C20 100 (300) 100 (300) 100 (300)
TM-RFM006C20 100 (300) 100 (300) 100 (300)
TM-RFM006E20 100 (300) 100 (300) 100 (300)
TM-RFM012E20 100 (300) 100 (300) 100 (300)
TM-RFM018E20 100 (300) 100 (300) 100 (300)
TM-RFM012G20 50 (300) 50 (300)
TM-RFM048G20 50 (300) 50 (300)
TM-RFM072G20 50 (300) 50 (300)
TM-RFM040J10 50 (200) 50 (200) 50 (200)
TM-RFM120J10 50 (200) 50 (200) 50 (200)
TM-RFM240J10
50 (200)
50 (200) 50 (200)
Time constant ɬ [ms]
Time constant ɬ [ms]
Time constant ɬ [ms]
Time constant ɬ [ms]
Speed [r/min]
Speed [r/min]
Commenti su questo manuale