Which of the following can also cause vibration in an induction motor besides mechanical unbalance?

Vibration in an induction motor can be minimized by:

True or False: Electrical issues such as unbalanced supply voltage can lead to vibration in induction motors.

An increase in vibration amplitude over time may indicate progressive mechanical wear.

Temperature changes in bearings have no significant effect on vibration readings.

A baseline vibration test should only be performed after the motor has been running for several months.

Vibration severity standards such as ISO 10816 help classify acceptable vibration levels for rotating machines.

Resonance occurs when the motor’s natural frequency matches an external excitation frequency.

Unbalance typically causes high vibration in the radial direction and at 1× running speed.

Which maintenance practice can help in early detection of vibration issues in induction motors?

True or False: Misalignment between the motor and the driven equipment can increase vibration levels.

Which of the following is NOT a common cause of increased vibration in induction motors?

• An unbalanced rotor will always cause equal vibration on both drive and non-drive ends.

• The acceleration signal is most useful for detecting low-frequency vibration issues like unbalance.