自動車用磁石の現状と将来

概要

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Modern automobiles use many permanent magnets in various electromagnetic components for comfort, safety, and fuel economy. In Japan, the annual use of permanent magnets for automobiles in 1998 accounted for 37% of the total production for ferrite magnets and 6% for rare-earth magnets. Ferrite sintered magnets are used in components such as starters, wipers, fan-motors, window regulators, and fuel-pump motors. Rare-earth sintered magnets are used in components such as anti-lock braking system (ABS) sensors, cam-angle sensors, revolution speed sensors, and ignition coils. Recently, the use of rare-earth magnets has increased dramatically, because of their use in ABS sensors for the safety as a standard equipment, and in motors for electric vehicles (EVs). Most EVs and hybrid electric vehicles (HEVs) employ permanent-magnet synchronous motors for higher efficiency. One traction motor of an EV or a HEV requires a few kilograms of highperformance NdFeB sintered magnets. This paper describes the current status and futuretrends of permanent magnets in automotive applications.
社団法人日本磁気学会の論文
1999-09-01