The permanent magnet motor has been around for decades but it is only now that the technology is being applied to large motors. Their comparatively small size and high accuracy have, in the past, made permanent magnet motors the preferred type for wristwatches and computer hard drives. ABB has been one of the pioneers in introducing this type of motors in larger si/.es - its largest permanent magnet motor now weighs in at seven tonnes. The company's best-known use of permanent magnet motors is the Azipod marine propulsion system.
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