Dec 01, 2012· When Rotor Bars fail, and the motor is accelerating and running at full speed, you may hear a distinctive "beat frequency" noise, the volume or amplitude modulating. Your own sense of hearing and ...
Swaged rotor bars ensure long life by minimizing the movement and vibration that can cause bar fatigue and failure. —High Frequency Induction Brazing End rings are joined to the bars by high frequency induction brazing on most rotors. This reduces stresses and hot spots in the joint. —Keeper Blocks These ensure increased rotor integrity
AC Squirrel Cage Rotor Repair And Manufacturing. Electrical Apparatus & Machine is dedicated to providing only the best and highest quality electric rotor repair and manufacturing for motor repair shops worldwide. Successful rotor repair depends on the expertise of the company making the repairs.
5 Car Repairs You Can't Afford to Skip. ... Rotors are especially costly to repair or replace. As they rub against worn brake pads, rotors become warped, which makes it tougher to stop the car (if you feel your car shudder as you brake, you probably have warped rotors). Fixing them requires that they be turned or smoothed out by a mechanic ...
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. In summary, the 869 offers current based analysis, but also a more advanced power based approach for broken Rotor Bar detection. A power based FFT algorithm provides the following benefits:
detection of broken rotor bars in induction motors using stator current measurements by mark steven welsh b.s.e.e., university of missouri-columbia, 1982 submitted in partial fulfillment of the requirements for the degrees of naval andengineer master of science electrical engineering and computer science
It was determined that bad braze joints between the bars and end rings from a rotor repair performed in 2001 caused the broken and cracked rotor bars. Savings A catastrophic failure of this motor would have resulted in a more expensive repair and the high costs associated with an unplanned outage.
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Regional Sales Manager at Industrial Motor Services in Richmond, ia. Chris says that a standard motor repair practice should include a rotor bar and stator slot count when the equipment is serviced. Additionally, Chris adds that a nameplate should be attached on the motor with the data as well as in the standard repair report.
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Broken rotor bar is one of the commonly encountered induction motor faults that may cause serious motor damage to the motor if not detected timely. Past efforts on broken rotor bar diagnosis have been focused on current signature analysis using spectral analysis and wavelet transform.
Rotor Testing With MCE By Noah Bethel ROTOR PROBLEMS!! How often have you been in a situation where you have to determine whether a rotor problem exists and the only indication you have is rotor bar pass frequency and a gut feeling. Squirrel cage induction rotors …
Sep 23, 2017· If you think that you might have a problem with your rotor bars, you should get them tested right away. If not, it could lead to sparking, wear of bearings, or motor core damage. These potential problems are more expensive than getting a test done. Fixing Rotors. Rotor repairs are not something to take lightly.
Oct 19, 2006· Rotor bar damages are often diagnosed when there are other problems. Modern diagnosis tools will show sidebands indicating rotor bar problems when there are other phenomena like unstable flow (in a pump application) or other load variation. The best test is to install the spare motor and run the test again.
May 17, 2016· Q: What causes brake rotors to warp? I have a slight vibration in my brakes and I think the rotors can be warped. Can I repair the worn rotors or do I need to replace them? Can I replace the rotor but not change the pad? Do I...
Four types of rotor construction exist today: aluminum die cast (ADC), copper die cast (CuDC), fabricated aluminum bars (AlBar), and fabricated copper bar (CuBar). In general, only the aluminum die-cast, fabricated aluminum, and copper bar rotors are in common use today. At this time this paper will discuss how these are manufactured.
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rotor bars. If the rotor has previously been painted, over-heated areas will often appear as blackened arc spots that have “broken through” the painted finish. These burn marks indicate that there is either a high resis-tance joint, or a break, in the rotor bars. A completely broken bar will sometimes cause burning of a section
Aug 11, 2016· A cracked rotor bar can also cause localized heating of the rotor which causes uneven expansion and rotor bowing. This results in an unbalance and a strong 1 times running speed vibration as well as the side bands related to slip frequency. Loose rotor bars may give similar symptoms and also will show vibration at rotor bar passing frequencies.
Motor rotors Rotors are composed of numerous layers of laminated steel and the rotor windings are composed of bars of copper or aluminum alloy that is shorted on both sides with shorting rings. These components can then fail through thermal stress, physical damage, imbalance, broken rotor bar, contamination and improper installation.
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Early detection of a broken rotor bar minimizes motor damage and reduces repair costs. In some cases, the broken bar condition starts with a fracture at the junction between the rotor bar and the end ring as a result of thermal and mechanical stresses . These stresses are more significant when starting motors with high-inertia loads.
Nov 01, 2004· Broken rotor bars (Fig. 1) rarely cause immediate failures, especially in large multi-pole (slow-speed) motors. However, if there are enough broken rotor bars, the motor may not start as it may not be able to develop sufficient accelerating torque.
Jul 26, 2018· Do you suspect that you have a cracked rotor bar in your electric motor? Broken rotor bars rarely cause immediate failures, especially in large multi-pole (slow-speed) motors. Broken rotor bars precipitate deterioration in other components as well and can result in time-consuming repairs and loss of motor efficiency.
Synchronous Rotor repair and rebuilding including rewind and reconditioning for rotating DC fields, amortisseur cage bars and shorting rings. Wound Rotor Motor repairs including core testing, lamination restack, rotor rewind and slip ring repair and reconditioning. Squirrel Cage Rotor engineered solutions for industrial applications including ...
Getting the rotor back up and running. ... Here are tips on how to find the problem, fix the rotor, and get the motor running again. ... but not all, rotor failures are caused by broken rotor bars ...
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4. Rotor Bar Passing Frequency – The # of rotor bars x Rotational Frequency Each of these frequencies is identified in the spectra shown in Figures 8 and 9. Torque Spectrum. A Torque Spectrum Showing Slip Frequency Peak and Two Multiples is shown in Figure 10. The running speed peak for a two pole motor is very close to the fundamental frequency.
Sep 20, 2019· How to Replace Brake Rotors. Brake rotors are metal discs that are attached to the axles of a vehicle. When the driver pushes the brake pedal, the brake pads press on the rotor, creating friction, which forces the wheels to turn slower....