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15. USING A DIRECT DRIVE MOTOR
(b) Dynamic brake time constant
The following shows necessary dynamic brake time constant τ for equation 15.1.
(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.
30
25
002
004
20
15
10
006
5
0
0
100
200
300
Direct drive motor speed [r/min]
TM-RFM_C20
60
50
012
40
30
048
20
10
072
0
0
100
200
300
Direct drive motor speed [r/min]
TM-RFM_G20
Direct drive motor
TM-RFM_C20
TM-RFM_E20
TM-RFM_G20
TM-RFM_J10
70
60
50
40
30
20
10
0
0
400
500
80
70
60
50
40
30
20
10
0
0
400
500
Permissible load to motor inertia ratio
[multiplier]
100 (300)
15 - 20
018
006
012
100
200
300
400
Direct drive motor speed [r/min]
TM-RFM_E20
040
240
120
50
100
150
Direct drive motor speed [r/min]
TM-RFM_J10
50 (300)
50 (200)
500
200
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