Abstract:The mechanical stability of retained austenite in a Cr-Ni weld metal in a welded joint under a service load is related to the initial amount of retained austenite and the type of welded joint. The welded joint used is the over-matching type, i.e., the tensile strength of the weld metal is higher than that of the base metal. For this welded joint, when the initial amount is less than 7.5%, the retained austenite is stable enough to remain in the weld metal over the whole tension process. However, when the initi… Show more
Flux leakage in the rotor core bridges is a problem specific to interior permanent magnet motors and has been unsolved till date. It is widely known that if the bridges are partially non-magnetically improved with low magnetic polarization, the leakage flux will be smaller, and the rotor will have a higher magnetic flux. We proposed that the portion of the silicon steel sheets that becomes the bridge after pressing can be nonmagnetized and laminated to fabricate the rotor core. Partially non-magnetic material with a polarization of almost zero was obtained by melting and mixing NiCr alloy powder with the silicon steel sheets. This non-magnetic improvement treatment was applied to the bridge in the rotor core sheet, in which the non-magnetic area width was 1.45 mm, and the prototype rotor core was fabricated by laminating 60 rotor core sheets. Upon measurement, the rotor core showed approximately 35% higher magnetic flux than a conventional one, with the actual value nearly identical to that obtained from the magnetic field analysis.
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