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Coils (windings)

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Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001338
EISBN: 978-1-62708-215-0
... fin winding machine. Figures 1 , 2 , 3 , 4 , 5 show the very extensive pitting damage observed on two of the three tubes examined and the superficial damage of the same type visible on the third, nonleaking sample. Such pitting is often caused by solutions that are only mildly...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.modes.c9001487
EISBN: 978-1-62708-234-1
... Abstract Copper shortening has been found to occur in the rotor windings of turbo alternators and takes the form of a progressive reduction in the length of the coils leading to distortion of the end windings. The trouble results from the high loading which develops between successive layers of...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.chem.c9001686
EISBN: 978-1-62708-220-4
... of failure was low flow transient operation. Coils (windings) Electric power generation Vaporizers ASME SA106 B Transgranular fracture Thermal fatigue fracture A metallurgical failure analysis was performed on a failed vaporizer coil removed from a horizontal forced...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.modes.c9001705
EISBN: 978-1-62708-234-1
... Abstract The working fluid of a hypersonic wind tunnel is freon 14 heated in molten-metal-bath heat exchangers. The coils of the heaters have failed several times from various causes. They have been replaced each time with a stainless steel deemed more appropriate, but they continue to fail. In...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001119
EISBN: 978-1-62708-214-3
... initiated from the spring inside coil surface. Examination of the fracture surface using scanning electron microscopy showed no evidence of fatigue. Final fracture occurred in torsion. X-ray diffraction analysis revealed high inner-diameter residual stresses, indicating inadequate stress relief from spring...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.conag.c0051294
EISBN: 978-1-62708-221-1
... fatigue. The solution was to increase the stress relieving temperature to reduce the residual stresses from coiling and hence improve fatigue performance. This may give rise to earlier fatigue failure in the wind-up direction, of course, but the net effect is to prolong the tine life significantly. The...
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
... this case could have been drawn without failure. Failure in service was due to overheating resulting from the inability of the conductor to carry the current where its cross section was reduced by the presence of a cavity. Another failure of a conductor occurred in one of the field coils of a direct...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.usage.c9001608
EISBN: 978-1-62708-236-5
... winding supported by its neighbors. However, once a coil is loosened and windings telescope, they are very vulnerable to damage. Unwinding alone, with no damage, can result in rejection because the coil will not fit into pipe making equipment and there is no way to recoil. (a) Edge damage. The orange...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.modes.c9001516
EISBN: 978-1-62708-234-1
... thin film head which crashed and wiped out all data. Note the pole piece and the coil windings. The two rails are produced by machining heads put of a big wafer of a ceramic material calcium titanate in this case. A composite ceramic of alumina and titanium carbide is also used to fabricate heads. Also...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.modes.c0048147
EISBN: 978-1-62708-234-1
... shown in Fig. 1(a) fractured at the two locations indicated by the arrows. The spring had been formed from hardened-and-tempered carbon steel strip and subsequently subjected to a phosphating treatment. In the normal manufacture of these springs, winding to solid is performed to take out set (provide...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c9001685
EISBN: 978-1-62708-235-8
... microscopy and X-ray imaging of fracture surfaces revealed pockets of inclusions at the crack origins. In addition, tests were conducted to evaluate the detrimental effects of internal hydrogen on ductility and crack initiation in this alloy. Coils (windings) Electric power generation Vaporizers U...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c9001725
EISBN: 978-1-62708-229-7
... failure. From metallurgical evidence it was concluded that damage originated in the rupture of a retaining ring at the outboard end of the generator. There are two such rings, one at each end of the generator. These rings hold the return loops of the windings in place as shown in Fig. 1 . These retaining...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0001811
EISBN: 978-1-62708-180-1
.... Lifting booms, coil hooks, lugs and rings, boxes and containers, trunnions, and miscellaneous attachments should be made of either normalized or quenched-and-tempered fully killed fine-grain steels. For equipment operated at temperatures below 20 °C (68 °F), the transition temperature of the material must...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0001813
EISBN: 978-1-62708-180-1
... springs, winding to solid is performed to take out set (provide stable torque output) before phosphating. Although this operation creates residual tensile stresses in the interior surfaces of the coils, phosphating of this spring had not produced sufficient hydrogen absorption to cause embrittlement...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.modes.c9001724
EISBN: 978-1-62708-234-1
... the return loops of the windings at either end of the rotor shaft as shown in the cross section of Fig. 1 and the photograph, Fig. 2 . Fig. 1 Sketch of End of Rotor Shaft in 100,000-Kw. Generator Showing End Bell Whose Function Is to Hold in Place Against Centrifugal Force the End Turns of...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006764
EISBN: 978-1-62708-295-2
... acoustically clear material All metals and alloys, sintered carbides, glass and ceramics, rubber, structural plastics, concrete Electromagnetic testing Measures impedance of coil close to conductive material. Coil impedance changes in relationship with cracks, inclusions, etc., affecting induced eddy...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.mech.c9001596
EISBN: 978-1-62708-225-9
... Sub-Category Analysis Design Stress Marginal Surface roughness Marginal Dimensions OK Wire material Microstructure OK Tensile strength OK Heat treatment OK Surface condition Unacceptable De-carburization OK Coiling process Surface condition Marginal Heat...
Book Chapter

Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003562
EISBN: 978-1-62708-180-1
... fretting is beneficial. The rotors of electrical generators have slots along their lengths in which the windings are located. These are held in place by wedges. Fretting can occur between the wedges and the undercut portion of the winding channel with the development of fatigue cracks in the rotor...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003566
EISBN: 978-1-62708-180-1
... a rubber-lined clamp attached at one end of a rotating shaft. A torque spring was connected through a lever arm at the opposite end of the shaft. To wind up the spring and place the hammer in position to begin the blow, a ratiomotor drive rotated the shaft. A trigger mechanism released the torque...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003524
EISBN: 978-1-62708-180-1
... because of their unfavorable orientation, usually parallel to the surface. Laminations seldom yield differences in absorption that enable laminated areas to be distinguished from lamination-free areas. Eddy-current inspection can be used on all materials that conduct electricity. If a coil...