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7 Selection
MITSUBISHI CNC
7-3 Selection of the power supply unit
For the power supply unit, calculate the spindle motor output and servo motor output each, and select the
capacity satisfying the required rated capacity and the maximum momentary output.
7-3-1 Calculation of spindle output
The spindle rated output and spindle maximum momentary rated output are calculated.
(1) Calculation of spindle rated output
The spindle rated output is calculated according to the following procedure.
(a) Spindle motor rated output
The spindle motor rated output is calculated from the following expression.
Spindle motor rated output =
MAX (continuous rated output, short-time rated output x short-time rated output
coefficient α)
(Note) For the spindle motor rated output, use the larger one of "continuous rated output" and
"short-time rated output x short-time rated output coefficient α".
For the spindle short-time rated output coefficient α, use the value in the "table 1.".
Table1. List of short-time rated output time and short-time rated output coefficient
(Note1) Select the set time for the short-time rated output of your spindle motor from the list.
E.g.) When the set time for the short-time rated output is "1/12h", it means "5 minutes".
(Note2) For the motor with coil changeover specification, select the set time for the short-time rated
output of the high-speed coil.
Short-time rated
output time
Short-time rated out-
put coefficient α
Short-time rated output
time
Short-time rated
output coefficient α
1 minute 0.2 5 minutes 0.7
2 minutes 0.4 6 to 7 minutes 0.8
3 minutes 0.5 8 to 9 minutes 0.9
4 minutes 0.6 10 minutes or more 1.0