Spindle Drive Unit Heat Radiation - Mitsubishi Electric MDS-B-SPJ2 Series Specification Manual

4.3 Spindle drive unit heat radiation

The loss generated during continuous rated load operation of the spindle drive unit is shown below.
Use the values in table considering the most adverse conditions when designing the thermal aspects
of the sealed control panel. In the actual machine, the heating value will be the middle value of the
load and no-load according to the cutting load and acceleration/deceleration duty. However, use the
loss generated during continuous rated load operation as a guideline.
Drive unit model
MDS-B-SPJ2-02
MDS-B-SPJ2-04
MDS-B-SPJ2-075
MDS-B-SPJ2-15
MDS-B-SPJ2-22
MDS-B-SPJ2-37
MDS-B-SPJ2-55
MDS-B-SPJ2-75
MDS-B-SPJ2-110
Note 1) For intermediate panel installation type (MDS-B-SPJ2-110C) units, the amount of heat
generated outside the panel is approx. (total amount of heat generated - 30) × 0.5 [W].
Note 2) The heat generated during regeneration is not included in the spindle drive unit's heating value.
If the acceleration/deceleration frequency is high and the regenerative resistor's heating value
is required, calculated it with the following outline equation.
W =
R
2
GD : Motor rotor inertia
M
2
GD : Motor shaft conversion load inertia
L
N : Motor speed
n : Acceleration/deceleration frequency
Heating value during rated output
During continuous
rating output (W)
2 2
n (GD + GD
M L
×
120 4
4. Handling
Spindle drive unit heating value
30
35
45
55
85
110
150
200
300 (Note 1)
2
2π • N
)
×
[W]
60
2
[kg•m ]
2
[kg•m ]
[r/min]
[times/min.]
4 − 4
During no-load (W)
15
15
15
20
20
20
20
20
25