What is the acceptable vibration levels in electric motors?
More stringent specifications regarding motor vibration call for maximum velocity levels of 0.1 in./sec on the housing and 1.5 mils of displacement vibration on the shaft.
Is standard for vibration?
ISO 10816-1 is the basic document describing the general requirements for evaluating the vibration of various machine types when the vibration measurements are made on non-rotating parts. … Shaft vibration measurement requirements and criteria are addressed in separate documents, namely ISO 7919-1 and ISO 7919-3.
What is use for vibration test on motor?
Noise and Vibration testing is used for preventative maintenance, reducing the chance of breakdowns by analysing any change in the noises or vibrations coming from the motor – any deviation found can then be used to diagnose and repair problems that could lead to motor failure down the line.
What is vibration in motor?
Vibration is simply a back and forth movement—or oscillation—of machines and components in motorized equipment. Vibration in industrial equipment can be a symptom, or cause, of a problem, or it can be associated with normal operation. … As machine speed increases the effects of imbalance become greater.
What are the 3 basic characteristics measured in vibration?
How far (amplitude or intensity), and how fast (frequency) the object moves helps determine its vibrational characteristics. The terms used to describe this movement are frequency, amplitude and acceleration.
What is 1X 2X 3X in vibration?
A 1X and 2X vibration signal predominant in the axial direction is generally the indicator of a misalignment between two coupled shafts. … The spectrum shows high axial vibration at 1X plus some 2X and 3X with 180° phase difference across the coupling in the axial direction.
What causes high horizontal vibration?
High horizontal readings are commonly associated with unbalance in the rotating elements. High axial readings generally indicate misalignment. The cause may be external, like coupling misalignment, or internal, like mechanical looseness or a bent shaft.
What are vibration limits?
The vibration limits according to ISO 10816 (bearing vibrations) and ISO 7919 (shaft vibrations) are as follows: Classification of vibration evaluation zones: … Vibration values within this zone are normally considered to be of sufficient severity to cause damage to the machine.
What is unit of vibration?
A complete assessment of exposure to vibration requires the measurement of vibration acceleration in meters per second squared (m/s2). … Several types of instruments are available for measuring acceleration, the rate of change of velocity in speed or direction per unit time (e.g., per second).