What is the importance of vibration analysis in electric motors?
Vibration characteristics and balancing
Vibration is defined as a mechanical fluctuation from an equilibrium point. Vibration can also be considered as period vibration. Period vibration is a random vibration or pendulum motion of an object. An example of this is the movement of tires when moving on a gravel road.
Vibration is defined as a mechanical fluctuation from an equilibrium point. Vibration can also be considered as period vibration. Period vibration is a random vibration or pendulum motion of an object. An example of this is the movement of tires when moving on a gravel road.
There are different types of vibrations that we experience everyday. These are both desirable and undesirable. It is important that we have a basic understanding on vibration analysis and some of its principles.
The most commonly used method for rotating machines is called vibration analysis. Measurements can be taken on machine bearing casings with seismic or piezo-electric transducers to measure the casing vibrations, and on the vast majority of critical machines, with eddycurrent transducers that directly observe the rotating shafts to measure the radial (and axial) vibration of the shaft. The level of vibration can be compared with historical baseline values such as former start-ups and shutdowns, and in some cases established standards such as load changes, to assess the severity.
What is vibration?
Vibration is a "back and forth" movement of a structure. It can also be referred to as a "cyclical" movement.
Vibration is a "back and forth" movement of a structure. It can also be referred to as a "cyclical" movement.
Benefits
1. Safety - failure of electrical components could be catastrophic, injuring or even killing employees, maintenance personnel or the public.
1. Safety - failure of electrical components could be catastrophic, injuring or even killing employees, maintenance personnel or the public.
2. Greater System Security - locate the problems prior to failure greatly reduces unscheduled outages, associated equipment damage and downtime.
3. Increased Revenue - with more uptime, revenue is maximized. With less maintenance on good components and faster repairs of faulty components, maintenance costs care are reduced leading to a better bottom line.
4. Reduced Outage Costs - the cost of an emergency outage is ten times greater than planned maintenance.
5. Reduce Spare Parts Inventory - with improved inspection techniques giving advanced warning of failure, fewer spare parts are required in inventory. What would it mean to the bottom line if your spare parts inventory could be reduced by 10%?
6. Reduced Operational Costs - with the system up and running for longer periods of time, the reduction and improvement of inspections, maintenance, spare parts inventory and outages will reduce the overall cost of operations.
How is the vibration of a motor measured (in what units)? Do you happen to know where I can find a ranking of motors by least to most vibration over the life of a motor? Or measured in random testing in an apples-to-apple comparison?
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Chris