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Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c9001397
EISBN: 978-1-62708-235-8
...Abstract Abstract Banding wires of the rotor of an 1800 hp motor were renewed following replacement of the banding rings. After about six months of service, a breakdown occurred due to bursting of the banding wires in several places. The 0.064 in. diam wire was nonmagnetic and of the 18/8 Cr-Ni...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.design.c9001424
EISBN: 978-1-62708-233-4
...Abstract Abstract Two examples concerning fabricated mild steel rotor spiders which failed due to lack of torsional rigidity, probably supplemented by the presence of high internal stress, are described. The machine concerned in the first case was a 3,000 hp three-phase slip-ring motor...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.mech.c0047865
EISBN: 978-1-62708-225-9
...Abstract Abstract Splined rotor shafts (constructed from 1151 steel) used on small electric motors were found to miss one spline each from several shafts before the motors were put into service. Apparent peeling of splines on the induction-hardened end of each rotor shaft was revealed by visual...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001851
EISBN: 978-1-62708-241-9
...Abstract Abstract Shaft misalignment and rotor unbalance contribute to the premature failure of many machine components. To understand how these failures occur and quantify the effects, investigators developed a model of a rotating assembly, including a motor, flexible coupling, driveshaft...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c9001484
EISBN: 978-1-62708-229-7
... of 160 lb. per sq. in. and a temperature of 550°F supplied by two fully automatically controlled boilers, one of which filled with water when the contacts of the feed pump motor fused. Some of the water was carried into the turbine, with the result that the rotor was pushed towards the LP end, wrecking...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.mech.c0047935
EISBN: 978-1-62708-225-9
... in the bearings was suspected to have caused the electric discharge by accumulation and discharge of static charge. The electrical resistance between the rotor and the motor frame lubricated with electrically conductive grease and the grease used in the current case was measured and compared to confirm the fact...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.mech.c9001483
EISBN: 978-1-62708-225-9
...Abstract Abstract A steel bolt had been used to join the copper connecting strips between the poles of a 10-pole, series-connected, rotating field rotor of a synchronous motor. The exciting current was 155 amps. Failure of the bolt resulted in severe damage to the stator windings...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c9001443
EISBN: 978-1-62708-235-8
... of a direct-current motor. The mode of failure and the changes in the microstructure showed that fracture was due to a defective resistance butt-weld which had been made when the wire was in process of drawing. A further example of a conductor failure occurred in a 12 SWG copper connection between the rotor...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.design.c9001578
EISBN: 978-1-62708-233-4
... with a Thermal Vector Case #7: Feed Pump Motor with Thermal Vector Case #8: Cracked Rotor Bars Case #9: Cracked End Rings Case #10: Rotor Eccentricity Case #11: Loose Base Case #12: A DC Motor and Bad SCR's (Silicon Controlled Rectifiers) Case #13: DC Motor Overheating Due to Unstable...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.bldgs.c9001576
EISBN: 978-1-62708-219-8
....a0003544 Some one thousand fans were used on large axial compressors for shop ventilation for about one year. Out of them two fans developed cracks on the blades. The rotor of the fan in question are connected directly to the rotor. The motor is fixed firmly with screws on 300 × 600 × 700 mm steel...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001828
EISBN: 978-1-62708-241-9
... of the shaft is controlled to a maximum of 28 HRC. The shaft has various diameters along its entire length. The diameter of the shaft where the journal is assembled is approximately 400 mm. Fig. 5 Pump motor rotor bearing assembly Fig. 6 Heat transport pump journal bearing assembly...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001363
EISBN: 978-1-62708-215-0
... lbf . ft) so that the tunnel airspeed could be increased when the rotor torque suddenly decreased to negative 2700 N.m (2000 lbf . ft) in an uncommanded event. Because control of the rotor had been lost, the breaker to the motors driving the propeller was opened to protect the motors. However, instead...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c9001473
EISBN: 978-1-62708-229-7
... it was synchronised out of phase with the supply, unless the tendency was for the alternator to motor, in which case the reverse power relay would operate. After the alternator made the noise, the machine circuit breaker remote control on the control room switchboard was examined and this was then found to be open...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003502
EISBN: 978-1-62708-180-1
... approach to the analysis, it is possible to review basic design issues and work toward the details in a progressive fashion. This helps to ensure that key points are not missed. For example, a large number of electric appliance motors failed by seizure when elastomeric components, which had been added...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c9001447
EISBN: 978-1-62708-235-8
..., whereas the latter is of a further portion of the same specimen in the etched condition. Fig. 23 Section through fracture-unetched. (× 40). Fig. 24 Section through fracture showing deformation near crack-etched. (× 80). In one example, the bars of an AC motor fractured where...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001831
EISBN: 978-1-62708-241-9
... the roller bearing failed, the rotor could not work normally, and this led to the increase of the service temperature within the motor, and finally brought about the unpredicted catastrophes. What a tremendous Butterfly Effect! Conclusions Recommendations This study was supported by Shanghai...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0001810
EISBN: 978-1-62708-180-1
... permitted a static charge to be accumulated and discharged. To confirm this, a motor made by the same manufacturer was obtained from stock for testing. The electrical resistance between the rotor and the motor frame was measured and was found to be 2 to 3 MΩ while the motor was running. A set of bearings...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0001808
EISBN: 978-1-62708-180-1
... The 4340 steel shaft shown in Fig. 7(a) , which was the driving member of a large rotor subject to cyclic loading and frequent overloads, broke after three weeks of operation. The shaft was also part of a gear train that reduced the rotational speed of the driven member. The driving shaft contained...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006753
EISBN: 978-1-62708-295-2
... and Prevention , Volume 11 of the ASM Handbook , 2002. Nevertheless, failures continue. Recalls of motor vehicles and consumer products are reported on a regular basis and tabulated on various websites. Building and bridge collapses are less common but still occur. Thus, the need for failure analysis...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003500
EISBN: 978-1-62708-180-1
... of the situation and the risk associated with additional failures. In most cases, one desires to identify root causes that are reasonably correctable. An example of the variety of possible root causes of an electric motor driven compressor assembly is provided in Table 3 ( Ref 22 ). Possible causes of electric...