3BHE024747R0101 Inverter module

In large high-speed motors, asymmetric heating of the shaft often occurs due to the loose fit between the rotor core and shaft, leading to unstable vibration. Therefore, a hot sleeve fit should be used between the rotor core and shaft of this type of motor, and a shaft with higher stiffness should be used as much as possible. Flexible rotors with operating speeds higher than the first or second critical speeds are particularly sensitive to thermal imbalance and require supplementary balancing during assembly.

Subcritical speed vibration

During the starting process of a horizontal motor, severe vibration may also occur when the rotor speed reaches half of its critical speed, which is due to the occurrence of the so-called subcritical speed. The difference in radial stiffness between two perpendicular rotors, such as the large teeth and wire grooves on the body of a bipolar turbogenerator rotor, and the keyways milled on the shafts of DC and AC motors to fix the iron core, commutator, and fan, are the reasons for the above phenomenon.

Vibration caused by ellipses

The ellipticity of the journal, like the difference in stiffness of the shaft in two mutually perpendicular directions, can cause vibration at twice the rotational speed frequency. In large high-speed motors, if rolling bearings are used and the journal diameter is above 100-120 millimeters, the ovality of the journal has a particularly significant impact on rotor vibration

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