Machines 2022, 10, 1106 2 of 16 Correction is a vital step of rotor dynamic balancing. There are two methods of rotor dynamic balancing: weight removing and weight adding.
This article reviews the literature concerning the balancing of rotors including the origins of various balancing techniques including ones that use influence coefficient, modal, unified, no phase ...
Erosion of Rotor. Rotor erosion is most commonly observed in fans or pumps that handle corrosive gases or fluids. It is likely that correction of unbalance resulting from rotor erosion is be accompanied by additional repair activity. Turbulent flow associated with a damaged rotor may be a source of additional vibration.
When the system simulated 3.2 g of weight imbalance, it can be seen from the human–machine interface that the RMS amplitude increased from 0.455 to 0.55875 mm/s (as shown in Figure 11).When the system automatically controlled the weight to perform the first balance correction, the RMS amplitude could be adjusted to 0.457 mm/s (as shown in Figure 12).
In certain circumstances it is possible to balance a rotor in place using vibration measurement instruments. Many modern vibration monitoring and analysis instruments …
Rotor Balancing. Firstly, Rotor Balancing is the process eliminating unbalance and vibrations in rotating machinery. Secondly, Balanced Rotors are essential for smooth …
Feature papers represent the most advanced research with significant potential for high impact in the field. A Feature Paper should be a substantial original Article that involves several techniques or approaches, provides an outlook for future research directions and describes possible research applications. ... A Case Study on Broken Rotor ...
The correction for all rotors with unbalances greater than V only needs to ensure that values smaller than V are achieved after the first correction. For stepped masses, for example, two masses (15 T and 25 T) would be sufficient to always achieve results better than 5 T (0.5 V) for initial unbalances between 10 and 30 T (1 V and 3 V).
A systematic way to apply the external impact to a rotating rotor has been introduced to minimize unbalance correction process time. Discover the world's research 25+ million members
If a vehicle has a vibration issue could the brake rotors contribute to the problem? The answer is no. Most brake rotors are balanced at the factory and instead of adding weight they remove a small amount of material in a process called mill balancing. In the field, rotors do not have enough mass or diameter to cause a significant balance problem.
In terms of smart balance correction, the amplitude correction rate was 103.8%, the double-frequency correction rate was 103.3%, and the correction process was performed in 3 min.
The methods employed in shop balancing can have a profound impact on the resulting balance condition of the rotor. The impact of shop balance technique is most important when the rotor is relatively flexible and/or long as is common with most turbomachinery. ... Check balance process will normally allow limited balance correction, since major ...
Another method is to balance the entire pump rotor as an assembled unit and to do so one time only. That might be a bit problematic at locations that will subsequently go through repair cycles while trying to omit …
The methods employed in shop balancing can have a profound impact on the resulting balance condition of the rotor. The impact of shop balance technique is most …
A case study of a broken rotor bar is used to validate the proposed method using a dataset of five motors. Among these, one motor operates without failure, while the remaining four exhibit broken rotor faults categorized as 1, 2, 3, and 4. The proposed method achieves 99.99% precision in identifying one to four defective rotor bars in IMs.
The Grinding and Correction of Face Gears Based on an Internal Gear Grinding Machine ... Feature papers represent the most advanced research with significant potential for high impact in the field. ... Kallaste, A. (2024). An Advanced Diagnostic Approach for Broken Rotor Bar Detection and Classification in DTC Controlled Induction Motors by ...
% à Ü á Minimum rotor-stator gap for AMB supported rotor (µm) & Distance of unbalance plane (mm) & à Ô ë Maximum vibration amplitude in AMB (µm) @ Distance of correction planes (mm) A Mass eccentricity (m) A É Ø å Permissible residual specific unbalance (kg∙mm/kg) ( Unbalance force (N) ) Balance quality grade (mm/s)
Induction machines (IMs) are commonly used in various industrial sectors. It is essential to recognize IM defects at their earliest stage so as to prevent machine performance degradation and improve production quality and safety. This work will focus on IM broken rotor bar (BRB) fault detection, as BRB fault could generate extra heating, vibration, acoustic noise, or …
This paper introduces a sophisticated approach for identifying and categorizing broken rotor bars in direct torque-controlled (DTC) induction motors.
a rotor before doing any balance work. Any correction made while the rotor was so deflected can become a built in unbalance if the rotor straightens when at operating speed. Long slender pump shafts rely on the stiffening effects of the impeller wear rings, they are not intended to be run to speed in air. DRIVE COUPLING UNBALANCE
Rotor balancing (also known as weight balancing of the armature or rotor) is the process of correcting the distribution of mass around the axis of rotation of a rotor. This correction minimizes the centrifugal forces that cause vibrations and potential damage to the machine.
Rotor balancing video from Pruftechnik using Vibxpert II. This short video walks you step by step through a simple rotor balancing procedure. Unbalance is a major root cause of …
"Large" corrections to an assembled rotor pose a nontrivial risk of vibration above the first critical speed due to modal balance, since large unbalance (that could be located away from balance correction planes) can be corrected to minimize shop balance machine output to comply with the 4W/N rule at the two planes defined but not correct ...
The spectral components due to broken rotor bars can be expressed as: f b = (1 ± 2s) f 1. The lower component is due to broken bars, and upper one is due to a related speed oscillation. Since the broken rotor bar disturbances are of an "impulse nature" (not a pure sine wave), the broken rotor bar spectral components can be expressed more
1 Introduction. As a part of important power equipment, induction motors (IMs) have been widely used in various fields with its advantages of easy control, high performance, easy maintenance and low cost [].A large number of studies indicate that the broken rotor bar (BRB) fault accounts for ∼10% of all motor failures [2, 3].Once BRB fault occurs in the motor, …
The calculation is done using the initial and final speeds of the rotor, initial unbalance, mass of the correction weight, radial distance from the center of the rotor to the …
A rigid rotor can be balanced at the two end planes and will stay in balance when in service. BALANCING FLEXIBLE ROTORS: This type of rotor is balanced at a low speed where the rotor does not flex. Correction for unbalance is made, then the speed is gradually increased, and the unbalance is corrected in stages until the rotor's operating ...
level of the healthy rotor during 869 installation and then configure the Broken Rotor Bar PKP level setting to be around 15 dB above it e.g., If the component level for healthy rotor is read as -70dB, then the Broken Rotor Bar pickup level should be set at around -60 dB to detect cracked rotor and -55dB to detect 1 Broken Bar.