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The effect of dynamic balance on the lifetime of the electric motor and fan; Expert guide on ventilation surfaces
Dynamic balance is one of the most important factors in increasing the lifespan of fans and electric motors. In this specialized guide, we examine the role of propeller balance in reducing vibration, noise and depreciation.
Introduction
In industrial ventilation systems, many failures start from a place that does not seem so serious at first glance: vibration. In many cases, this vibration is a direct result of the fan blade being out of balance. A fan may appear to rotate without problems, but if the mass balance in its rotating components is not adjusted correctly, constant pressure will be applied to the bearings, shaft, coupling and electric motor, and over time it will impose heavy costs on the assembly.
In this specialized article, we examine what dynamic balance is, why it is important in the operation of industrial fans, and how it can increase the lifespan of the electric motor and the entire ventilation system.
What is dynamic balance?
Dynamic balance is a process in which the distribution of mass in a rotating part, such as a fan impeller, is modified in such a way that the least amount of vibration and unbalanced force is created when rotating at working speed.
In industrial equipment, it is not enough to simply balance the part at rest. A propeller may be fine at standstill, but unbalanced at high rpm. For this reason, dynamic balance is more important than static balance.
Why is dynamic balance important in industrial fans?
Industrial fan usually works at high speed and any misalignment in the impeller mass can cause the generation of centrifugal force. This power is continuously transferred to the shaft, bearings, bases and electric motor.
The result of this situation can include the following:
- Increasing vibration in the fan body
- Increasing operation noise
- Decreasing the life of bearings
- Additional pressure on the shaft and coupling
- Increasing energy consumption
- Decreasing performance efficiency
- Possibility of mechanical failure in rotating parts
For this reason, dynamic balance is not just an additional step in making a fan, but one of the main factors to ensure the quality and durability of the device.
What effect does the lack of balance of the fan have on the electric motor?
Many think that the problem of imbalance is only related to the fan itself, but. When the fan propeller inadvertently affects the electric motor. When the fan impeller is unbalanced, the resulting vibration is transmitted to the motor through the shaft or transmission system.
This transfer of vibration eventually causes:
Engine bearings wear out sooner
Bearings and bearings are very sensitive to radial loads and continuous impacts. Continuous vibration can greatly reduce their downtime.
Increase the working temperature of the engine
When the engine is subjected to irregular loads and vibration, the internal friction increases and this causes an increase in the working temperature of the engine.
The shaft is under tension
In severe vibration conditions, the motor shaft and the parts connected to it are subjected to abnormal pressure, and in the long run they may suffer bending or fatigue cracks.
The overall efficiency of the system will drop
When part of the energy is used to deal with vibration and vibration, the actual efficiency of the device will decrease and the power consumption will increase.
The most important reasons for disturbing the dynamic balance of the fan
Fan balance is not always just about the initial build quality. Even a fan that is perfectly balanced at first can become unbalanced over time.
Accumulation of dust or material on the blades
In industrial environments, especially in dust collection systems, particles may accumulate on one part of the blades and change the mass distribution.
Local corrosion or wear
If a part of the propeller is deformed due to wear or corrosion, its balance will be disturbed.
Improper welding or repair
Any repair without considering weight distribution can cause unbalance.
Change of license form
At high speeds or due to working at high temperature, some propellers may suffer from deformation or deformation.
Incorrect installation
Even if the propeller is well balanced, incorrect mounting on the shaft or misalignment can also cause vibration.
Signs of an unbalanced fan or propeller
If the dynamic balance of the fan has a problem, the following symptoms are usually observed:
- Perceptible vibration in the body or mounts
- Abnormal noise at certain speeds
- Frequent failure of bearings
- Loose bolts and connections
- Abnormally hot engine
- Decreased suction or blowing efficiency
- Cracks in the mount or Retaining components
These symptoms should not be ignored, because continuing to work under these conditions can lead to bigger failures.
How does dynamic balance increase system life?
When the fan blade is properly dynamically balanced, unbalanced forces are minimized and the entire system runs more smoothly. This topic has several important results:
Reducing the depreciation of bearings
Bearings in low-vibration conditions will have a much longer life and the need for early replacement will be reduced.
Increasing the life of the electric motor
A motor that receives less vibration works in more stable conditions and less pressure is applied to its coil, shaft and bearing.
Reduce the cost of repairs
When the vibration is reduced, chain failures in the coupling, chassis, base, bearings and connections are also reduced.
Improve efficiency
A balanced fan converts energy into air flow better and part of the power is not wasted in vibration.
sound reduction
One of the most important benefits of a proper balance is the reduction of system operation noise, which is important for both industrial operation and workplace safety.
The role of ventilation surfaces in the dynamic balance of the fan
In air conditioners, dynamic balance is not just a ceremonial step, but a serious part of the quality control process. An industrial fan can have a reliable performance and a long life when its blade is set based on the actual working speed, operating conditions and type of use.
Attention to this issue makes the fan produced:
When should the fan balance be checked?
Dynamic balance check is not only for build time. In the following conditions, it is necessary to check the condition of the fan again:
- After repairing or replacing the impeller
- After observing abnormal vibration
- At the time of frequent bearing failure
- After working for a long time in polluted environments
- When the fan noise suddenly increases
summary
Dynamic balance is one of the most important factors affecting the performance quality, lifespan and maintenance cost of industrial fans and electric motors. The more balanced the fan impeller, the less vibration, the lower the wear and the longer the system will last. On the other hand, ignoring this issue can lead to premature failure of the engine, bearings, shaft and even reduce the overall efficiency of the system.
If your goal is to have a stable, low-noise and low-consumption industrial ventilation system, dynamic balance should be a priority in the selection and construction of the fan from the very beginning.
The effect of dynamic balance on the lifespan of the electric motor and fan; Expert guide on ventilation surfaces
Introduction
In industrial ventilation systems, many failures start from a place that does not seem so serious at first glance: vibration. In many cases, this vibration is a direct result of not being balanced in the fan blade. A fan may appear to spin smoothly, but if the mass balance in its rotating components is not properly adjusted, constant pressure is placed on the bearings, shaft, coupling, and electric motor, and over time, it imposes heavy costs on the assembly.
In this specialized article, we examine what dynamic balance is, why it is important in the operation of industrial fans, and how it can increase the lifespan of the electric motor and the entire ventilation system.
What is dynamic balance?
Dynamic balance is a process in which the distribution of mass in a rotating part, such as a fan blade, is modified in such a way that the least amount of vibration and unbalanced force is created when rotating at working speed.
In industrial equipment, it is not enough for the component to be balanced at rest. A propeller may be fine at standstill, but unbalanced at high rpm. For this reason, dynamic balance is more important than static balance.
Why is dynamic balance important in industrial fans?
Industrial fan usually works at high speed and any misalignment in the mass of the propeller can cause the generation of centrifugal force. This power is continuously transferred to the shaft, bearings, bases and electric motor.
The result of this situation can include the following:
- Increasing vibration in the fan body
- Increasing operating noise
- Decreasing the life of bearings
- Additional pressure on the shaft and coupling
- Increasing energy consumption and reducing efficiency
- Possibility of mechanical failure in rotating parts
For this reason, dynamic balance is not just an additional step in making a fan, but one of the main factors to ensure the quality and durability of the device.
What effect does the lack of balance of the fan have on the electric motor?
Many think that the problem of imbalance is only related to the fan itself, but the vibrations directly affect the electric motor. When the fan impeller is unbalanced, the resulting vibration is transmitted to the motor through the shaft or the transmission system.
This transmission of vibration eventually causes:
Engine bearings wear out sooner
Bearings and bearings are very sensitive to radial loads and continuous impacts. Continuous vibration can greatly reduce their downtime.
Increase the working temperature of the engine
When the engine is subjected to irregular loads and vibration, the internal friction increases and this increases the engine's working temperature.
The shaft is under tension
In the condition of severe vibration, the motor shaft and the parts connected to it are subjected to abnormal pressure and in the long run they may suffer bending or fatigue cracks.
The most important reasons for disturbing the dynamic balance of the fan
Fan balance is not always just about the initial build quality. Even a fan that is perfectly balanced at the beginning may become unbalanced over time.
- Dust accumulation: In dust collection systems, particles accumulate on a part of the blades and change the mass distribution.
- Local corrosion or wear: If a part of the propeller is deformed due to wear, its balance is disturbed.
- Improper welding or repair: Any repair without considering the weight distribution can cause imbalance.
- Incorrect installation: Failure to align the fan and motor can also cause vibration.
Benefits of dynamic balance for system longevity
When the fan blade is properly dynamically balanced, unbalanced forces are minimized and the entire system runs more smoothly. This issue has several important results:
Reducing the depreciation of bearings
Bearings in low-vibration conditions will have a much longer life and the need for early replacement will be reduced.
Increasing the life of the electric motor
A motor that receives less vibration works in more stable conditions and less pressure is applied to its coil and shaft.
Reduce the cost of repairs
When the vibration is reduced, the chain failures in the coupling, chassis, base and connections are also reduced.
Improve efficiency
Balanced fan converts energy into air flow better and part of the power is not wasted in vibration.
The services of ventilation surfaces in dynamic balance
In air conditioners, dynamic balance is a serious part of the quality control process. An industrial fan can have a reliable performance and a long life when its propeller is set based on the actual working speed and operating conditions.
Attention to this issue makes the fan produced by us:
- To have less vibration.
- To provide a smoother operation.
- To apply less pressure to the electric motor.
- To have a much lower maintenance cost during the operation period.
summary
Dynamic balance is one of the most important factors affecting the performance quality, lifespan and maintenance cost of industrial fans and electric motors. The more balanced the fan impeller, the less vibration, the lower the wear and the longer the system will last. If your goal is to have a stable, low-noise and low-consumption industrial ventilation system, dynamic balance should be a priority in the selection and construction of the fan from the very beginning.
To receive expert advice on ventilation systems and ensure the standards of centrifugal fan manufacturing, contact Safahan ventilation experts.
Diagnosing and fixing unauthorized vibrations in Safahan ventilation industrial ventilation systems
A step-by-step guide to identify and fix vibration in industrial centrifugal fans. Accurate diagnosis, methods of correction and increasing the life of equipment in the ventilation fields.
Introduction
In this specialized guide of ventilation surfaces, we examine the main causes of unauthorized vibrations, the initial symptoms and step-by-step methods of troubleshooting and fixing them.
What is the permissible vibration in industrial fans?
Every rotating equipment has some natural vibration during operation; But when this range exceeds the limits of the industry standard (such as ISO 10816 or AMCA standards), it is considered unauthorized and requires immediate action. Regular vibration monitoring with vibration measuring instruments is the first step in preventive maintenance.
The main causes of unauthorized vibration in industrial fans
1. Propeller mass imbalance (Unbalance)
The most common reason for vibration in working cycles is the imbalance of the propeller. This may happen due to the accumulation of sediment and dust on the blades, asymmetric wear, or mechanical damage.
2. Misalignment
In direct coupling or belt systems, if the axis of the electric motor shaft and the fan shaft are not exactly in the same direction, a strong angular and parallel stress is created, which manifests itself as high frequency vibration and heating of the bearings.
3. Mechanical Looseness
Looseness of the chassis screws, looseness in the bearing seat (Housing) or the foundation not being strong will intensify the vibrations of the fan base and body.
4. Bearing Defects
Damage in the balls or groove of the bearing, in addition to producing a howling or crushing sound, causes intermittent shocks to the axis and increases the vibration range.
5. Aerodynamic problems and surge (Aerodynamic Surge)
If the blade angle, inlet/outlet duct dimensions, or housing design is not standard, the airflow will be disturbed and separated, which will cause strong pulsating vibrations in the fan body.
Step-by-step procedures for on-site vibration troubleshooting
To accurately identify the source of the vibration, perform the following steps in order:
First step: visual inspection and safety
Stop and lock the device. Inspect and clean the inside of the housing and on the blades for dust, grease or foreign particles.
Second step: check the tightness of the connections
Check the tightening and torque of all chassis bolts, shock mounts, bearing block bolts, and motor nuts.
The third step: checking the alignment of the pulleys and belts
In pulley and belt systems, check pulley groove alignment and proper belt tension with a ruler or laser alignment. Excessive tension of the belt will hit the bearings.
Fourth step: vibration test with frequency meter
If the vibration still remains, check with a vibration analyzer what is the dominant frequency of the vibration (for example, 1X vibration indicates unbalance and 2X indicates misalignment).
Ways to fix and prevent vibration
Use of industrial standard shock absorbers
Installation of spring or rubber shock absorbers according to the weight and working frequency of the fan under the chassis prevents the transmission of vibration to the building structure and foundation.
Dynamic rebalancing on site or workshop
If the impeller is warped or has an asymmetric weight, it should be rebalanced by on-site portable equipment or a workshop dynamic balancing device.
Optimization of channeling and air flow
Establishing flexible connections (canvas) in the inlet and outlet of the fan prevents the transmission of channel vibration to the device.
Commitment to quality in ventilation surfaces
In Safahan, all propellers are subjected to strict dynamic balance and vibrometry tests before final assembly, and chassis are designed with a high rigidity factor so that the systems work in the harshest industrial conditions with minimal vibration and noise.
If the ventilation systems and centrifugal fans of your collection are facing the problem of vibration or unusual noise, contact the technical team of Safahan Ventilation.