| 摘要 |
An annular ferromagnetic portion, i.e., "track", of the body to be balanced is rotated adjacent a first electromagnet having a decaying magnetic field which renders that track magnetically homogeneous. Thereafter, a large electrical current of short duration from the discharge of a capacitor is passed through a second, marking electromagnet positioned adjacent that track to produce a high-intensity magnetic pulse. This magnetic pulse produces a very localized spot of permanent magnetization in the track which spot serves as the reference "mark". When the body is then rotated during its balancing operation, that mark will produce an electrical signal each time it passes a magnetic/electric transducer positioned adjacent the rotating track. When the periphery of the body to be balanced consists of a plurality of lands separated by axially aligned slots, the periphery is scanned (while the body is being rotated) and triggering of the discharge current from the capacitor through the marking electromagnet is determined by that scanning to the end that it occurs when one of the lands is immediately adjacent the marking electromagnet.
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