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Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.mech.c9001900
EISBN: 978-1-62708-225-9
... Abstract Incorrect grounding of an electric motor resulted in electric current passing through a 52100 steel ball bearing and caused multiple arcing between the rolling elements. The multiple arcing developed a pattern on the outer race known as ‘fluting’. A section of ball race outer showed...
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
... 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 the currently...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.mech.c0047939
EISBN: 978-1-62708-225-9
... Abstract Rough operation of the roller bearing mounted in an electric motor/gearbox assembly was observed. The bearing components made of low-alloy steel (4620 or 8620) and the cup, cone and rollers were carburized, hardened and tempered. The contact surfaces of these components (cup, cone...
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Published: 01 June 2019
Fig. 1 Armature for a large electric motor that failed during fabrication. The cause of failure was lamellar tearing. (a) Schematic diagram of the weld preparation and the position of the failed weld. (b) Schematic of crack initiation and propagation from the root of the weld More
Image
Published: 01 June 2019
Fig. 1 Low-alloy steel roller bearing from an improperly grounded electric motor that was pitted and etched by electrolytic action of stray electric currents in the presence of moisture. More
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Published: 01 January 2002
Fig. 51 Armature for a large electric motor that failed during fabrication. The cause of failure was lamellar tearing. (a) Schematic diagram of the weld preparation and the position of the failed weld. (b) Schematic of crack initiation and propagation from the root of the weld More
Image
Published: 30 August 2021
Fig. 34 Low-alloy steel roller bearing from an improperly grounded electric motor that was pitted and etched by electrolytic action of stray electric currents in the presence of moisture More
Image
Published: 30 August 2021
Fig. 22 Armature for a large electric motor that failed during fabrication. The cause of failure was lamellar tearing. (a) Schematic diagram of the weld preparation and the position of the failed weld. (b) Schematic of crack initiation and propagation from the root of the weld More
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.usage.c0047823
EISBN: 978-1-62708-236-5
... Abstract High-horsepower electric motors were utilized to drive large compressors (made of 4340 steel shafts and gear-type couplings) required in a manufacturing process. The load was transmitted by two keys 180 deg apart. Six of the eight compressor shafts were found cracked in a keyway...
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 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
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.usage.c9001499
EISBN: 978-1-62708-236-5
... conditions? A. It was the power drive unit for an overslung lumber carrier running back and forth on rails. Q. What type of power input was used—electric motor, gasoline engine, or hydraulic motor? A. Hydraulic motor driven by a gasoline engine. (The analyst knew from past experience that other...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c0089793
EISBN: 978-1-62708-235-8
.... 1 Armature for a large electric motor that failed during fabrication. The cause of failure was lamellar tearing. (a) Schematic diagram of the weld preparation and the position of the failed weld. (b) Schematic of crack initiation and propagation from the root of the weld The morphology...
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
... of the greases: ( a ) fresh and ( b ) used Fig. 10 XRD results of the greases: ( a ) fresh and ( b ) used Abstract An air blower in an electric power plant failed unexpectedly when a roller bearing in the drive motor fractured along its outer ring. Both rings, as well as the 18 rolling...
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
... during the soldering operation. Banding Chlorides Electric motors Motor rotors Soldering fluxes Wire 18-8 Stress-corrosion cracking The banding wires of the rotor of an 1800 H.P. motor were renewed following replacement of the banding rings and, after about six months' service...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.rail.c9001496
EISBN: 978-1-62708-231-0
... Abstract A failed spiral gear and pinion set made from 4320H Ni-Cr-Mo alloy steel operating in a high-speed electric traction motor gear unit driving a rapid transit train were submitted for analysis. The pinion was intact, but the gear had broken into two sections that resulted when two...
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
... Abstract Following the fusing of one of the copper leads in the choke circuit of an electric welder, a piece of the affected lead was obtained for examination. The sample had large internal cavities and surface bulges. It is remarkable that a wire containing defects of the magnitude present...
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
... Abstract Vibration analysis can be used in solving both rotating and nonrotating equipment problems. This paper presents case histories that, over a span of approximately 25 years, used vibration analysis to troubleshoot a wide range of problems. Current testing Fans Generators Motors...
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
... torsional rigidity with the consequent development of excessive stresses in the welds at the junctions of the bars with the sleeve, the torque being of a fluctuating character due to the impulses imparted by the engine. Dynamics Electric motors Loads (forces) Motor rotors Weldments Welded steel...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.rail.c9001719
EISBN: 978-1-62708-231-0
... with a General Electric traction motor SD40-2T. See Figures 1 , 2 . For proper understanding a brief synopsis of how a traction motor operates will follow. Fig. 1 Traction motor without axle and wick assembly Fig. 2 Cutaway view of traction motor. Electrical power from the main diesel...
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
... example, use of an electrically non-conductive grease prevented proper grounding. Example 1: Pitting Failure of Ball Bearings in an Electric Motor by Static Electrical Discharges The electric motor in an office machine was producing intermittent noise. Ball bearings were suspected as the source...