Справочник Пользователя для Mitsubishi Electronics IB-1500193(ENG)-D

Appendix 3 - 3

(1) When you select fittings for the motor shaft, such as a gear, pulley, coupling and rotary joint for coolant, 

choose those that meet the motor specifications (shaft diameter, rotation speed and output torque). If 

any of the fittings is outside the specifications, the motor failure or accident may result. Apply such 

fastening method as a shaft lock element so as not to apply impact of a hammer, etc. during installation.

(2) The unbalance of the rotary fittings should be as small as possible. We recommend you to choose such 

fittings that have a fully symmetric shape, and arrange screw holes on their end faces at short and equal 

intervals in the circumferential direction. When you do balancing of the fittings before installation to the 

motor, suppress the circumferential vibrations as well as add screws to the screw holes formed on the 

fittings for the purpose of balancing. After balancing, apply thread locker on the screws to avoid 

loosening.

(3) If you use a rotary joint for coolant for a hollow shaft specification motor, prepare a coolant drain route 

by such as making a draining hole in order to prevent leaked coolant from intruding into the motor. The 

coolant intruded into the motor may degrade the motor insulation or may cause bearing deterioration.

(1) When you attach fittings such as a gear, pulley, coupling and rotary joint for coolant to the motor shaft, 

be careful not to apply excessive impact by striking with a hammer, etc. This may cause the shaft 

distortion and bearing damage, resulting in abnormal vibration, sound or shorter bearing life.

(2) After attaching the fittings, carry out no-load operation up to the motor's maximum speed, and use an 

accelerometer or vibrometer to confirm there is no abnormal vibration. The points to measure are the 

bracket sections where bearings are stored (on the load and opposite load sides). 

Make sure to place the motor on an elastic mat to avoid resonance with surrounding devices during 

measurement.

(3) The vibration acceleration shall be 0.5G (4.9m/s2) or less or the vibration amplitude shall be V5 (peak-

to-peak is 5

μm) or less in all the speed range. If these values are not met, the unbalance of the attached 

fittings may be too large. In such case, carry out balancing for the attached fittings or for the motor with 

the fittings attached.

 

Bracket (opposite load side)

Bracket (load side)

Elastic mat

How to measure motor vibration

 

Power side bracket (axial direction)

Elastic mat

Opposite power side bracket (horizontal and vertical)

Power side bracket (horizontal and vertical)

Locations where motor vibration is measured