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See Chinese contents: GB/T 38090-2019 GB/T 38090-2019: Technical requirements of permanent magnets for drive motor of electric vehicle
This Standard stipulates the technical requirements (magnetic property, temperature characteristics, allowable deviations of magnetic property, allowable deviations of dimensions and corrosion resistance) of sintered neodymium iron boron permanent magnets for drive motor of electric vehicle, as well as their test methods, inspection rules, marking, packaging, transportation and storage, etc.
