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15. USING A DIRECT DRIVE MOTOR
15 - 19
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
Power supply
capacity [kVA]
Servo amplifier-generated heat [W]
Area required for
heat dissipation [m
2
]
At rated output With servo-off
TM-RFM002C20
MR-J4-20B(-RJ)
MR-J4-20B1(-RJ)
0.25 25 15 0.5
TM-RFM004C20
MR-J4-40B(-RJ)
MR-J4-40B1(-RJ)
0.38 35 15 0.7
TM-RFM006C20
MR-J4-60B(-RJ)
0.53 40 15 0.8
TM-RFM006E20 0.46 40 15 0.8
TM-RFM012E20 MR-J4-70B(-RJ) 0.81 50 15 1.0
TM-RFM018E20 MR-J4-100B(-RJ) 1.3 50 15 1.0
TM-RFM012G20 MR-J4-70B(-RJ) 0.71 50 15 1.0
TM-RFM048G20 MR-J4-350B(-RJ) 2.7 90 20 1.8
TM-RFM072G20 MR-J4-350B(-RJ) 3.8 110 20 2.2
TM-RFM040J10 MR-J4-70B(-RJ) 1.2 50 15 1.0
TM-RFM120J10 MR-J4-350B(-RJ) 3.4 90 20 1.8
TM-RFM240J10 MR-J4-500B(-RJ) 6.6 160 25 3.2