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15. USING A DIRECT DRIVE MOTOR
15.4.2 Power supply capacity and generated loss
Table 15.1 indicates servo amplifiers' power supply capacities and losses generated under rated load. For
thermal design of an enclosed type cabinet, use the values in the table in consideration for the worst
operating conditions. The actual amount of generated heat will be intermediate between values at rated
torque and servo-off according to the duty used during operation. When the direct drive motor is run at less
than the rated speed, the power supply capacity will be smaller than the value in the table, but the servo
amplifier's generated heat will not change.
Table 15.1 Power supply capacity and generated loss per direct drive motor at rated output
Direct drive motor
Servo amplifier
MR-J4-20TM
TM-RFM002C20
MR-J4-20TM1
MR-J4-40TM
TM-RFM004C20
MR-J4-40TM1
TM-RFM006C20
MR-J4-60TM
TM-RFM006E20
TM-RFM012E20
MR-J4-70TM
TM-RFM018E20
MR-J4-100TM
TM-RFM012G20
MR-J4-70TM
TM-RFM048G20
MR-J4-350TM
TM-RFM072G20
MR-J4-350TM
TM-RFM040J10
MR-J4-70TM
TM-RFM120J10
MR-J4-350TM
TM-RFM240J10
MR-J4-500TM
Servo amplifier-generated heat [W]
Power supply
capacity [kVA]
At rated output
0.25
25
0.38
35
0.53
40
0.46
40
0.81
50
1.3
50
0.71
50
2.7
90
3.8
110
1.2
50
3.4
90
6.6
160
15 - 18
Area required for
heat dissipation [m
With servo-off
15
0.5
15
0.7
15
0.8
15
0.8
15
1.0
15
1.0
15
1.0
20
1.8
20
2.2
15
1.0
20
1.8
25
3.2
2
]
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