Mitsubishi Electronics IB-1500193(ENG)-D ユーザーズマニュアル

Appendix 3 - 5

(1) After mounting the motor on a machine and engaging the shafts, perform unloaded operation up to the 

motor's maximum speed to confirm there is no abnormal vibration or sound. If abnormal vibration or 

sound is generated, shaft coupling failure or unbalance on the spindle side can be the cause. Therefore 

check again on these two items.

(2) If you apply coolant piping for a hollow shaft specification motor, be careful so that peripheral 

components such as a tube will not apply tension on the motor rotor or cause unbalance.

(3) If you have punched a hole or cutout on a distance block for coolant pipe, cover the hole or cutout with a 

metal sheet after piping. If you leave the hole, this may degrade the motor cooling performance or 

machine rigidity, etc.

(1) To yield good cooling performance, provide a space of at least 30 [mm] between the cooling fan and 

wall. If the motor is covered by a structure and the air is not exchanged, its cooling performance 

degrades and the motor is unable to fully exercise its performance, which may cause the spindle motor 

overheat alarm. Thus avoid use of the spindle motor in an enclosed space with little ventilation.

(2) Under the standard cooling fan specifications, air is taken in from the load side and exhausted from the 

counter-load side. To secure the motor's cooling performance, arrange the machine structure so that 

the exhaust from the counter-load side will not flow to the load side and external air (at a room 

temperature) can be taken in from the load side.

(3) If you continue to use the spindle motor with dirt such as oil mist and dust adhered, its cooling 

performance degrades and the motor is unable to fully exercise its performance, which may cause the 

spindle motor overheat alarm. In some cases this may result in damage to the bearing or cooling fan. 

Use a filter, etc. to protect the motor from oil mist and dust.

(4) To secure the cooling performance, perform cleaning of spindle motor and cooling fan on a regular 

basis.