Vibration - Mitsubishi Electric JR Series Instruction Manual

3-phase squirrel-cage induction motor
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Table 8 Temperature rise limit (For ambient temperature of 40°C) (Unit: K (Kelvin))
Section
Winding (standard value)
Bearings (recommended value)
(Notes) 1. If the ambient temperature exceeds 40°C, subtract the value in Table 8 by the difference.
i. Immediately stop the motor if an abnormality occurs.
j. When driving the motor with a 400V class inverter, install a suppression filter or reactor on the
inverter side, or use a motor with reinforced insulation. The tolerable voltage of the surge
resistance reinforced motor is 1250V0-p. A filter is required if the tolerable voltage is exceeded.
k. The Model SF-HR motor can be operated at a 1:10 (6 to 60Hz) constant torque using the
Mitsubishi general-purpose inverter FREQROL advanced flux vector control.
Refer to the Inverter Instruction Manual when using constant torque operation.

10. VIBRATION

(1) Tolerable vibration during operation
a. When running a loaded machine with the motor, the motor may also vibrate due to the coupling
precision with the loaded machine or the effective of the vibration generated from the loaded
machine. The degree of vibration will fluctuate according to the state of the foundation and base.
This vibration should be as small as possible,
but the range in which there can be a slight
fluctuation due to the motor speed or
installation conditions is shown in Fig. 6. If the
vibration exceeds this tolerable value, find the
cause, and take appropriate measures.
b. The range that the standard structure
motor can withstand shocks is generally
4.9m/s
2
{0.5G}. If an abnormal vibration
acceleration could be applied on the motor
such as when using the motor for a press,
etc., consult your dealer. Reference values
are shown in brackets.
c. If the machine side unbalance is large due
to the installation of a fan or blower, etc.,
directly onto the motor shaft or direct
coupling with the partner machine, the
motor vibration will increase and may
damage the bearings, etc. The motor side
balance must be within G2.5 on JIS B 0905
(balance of rotation devices).
d. If the motor vibration is significant, check the
residual unbalance in rotating bodies
(balance quality within class G2.5 is
recommended) and direct coupling accuracy (refer to 5-(1)). If the balance and direct coupling
accuracy are appropriate, check the natural frequency in the installed state to confirm that the
motor vibration does not resonate with rotational components or 2f component of the power supply.
If it resonates with the components, change the rigidity of installation.
(2) Vibration during stopping
If vibration is applied on the motor during stopping, fluting (fine friction due to relative fine vibration
on bearing rolling race surface) may occur on the bearings. This may lead to abnormal noise from
the bearings or bearing damage, so caution is required.
If this fluting occurs, the balls or rollers and the inner and outer rings must not be moved relatively.
a. Constantly rotate the motor with some method.
b. Fix the bearing's roller race surface so that it does not vibrate relatively.
c. If the vibration is not large, alternately run two or more motors at intervals of several days.
d. Decrease the vibration of the neighboring machines during operation.
e. Modify the foundation or floor structure so that the vibration when the motor is stopping is decreased.
Heat-resistance class 120 (E)
Resistance
Thermometer
method
method
75
55 (surface)
- 10 -
Heat-resistance class 130 (B)
Resistance
Thermometer
method
method
80
55 (surface)
Fig. 6
Tolerable motor vibration value
(Max. value on frame)
Heat-resistance class 155 (F)
Resistance
Thermometer
method
method
105
65 (surface)
Vibration velocity standard
Vibration velocity
Frame No.
standard
[mm/s (rms)]
132 or less
2.8 or less
160 to 225
4.5 or less
Speed (min
-1
)

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