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This paper presents a hybrid excitation motor for a main spindle drive in end- and face-milling tools which is operated with high speed 50,000 min-1. The proposed motor has not only a permanent magnet but also the field coil which makes field weakening and strengthening control possible with taking no notice of the magnet demagnetization. In addition, the sum of iron and copper losses of the motor...
A mechanism was investigated for enhancing the reproduced voltage of a recording system combining a ring head with a electroless-deposited perpendicular double-layered medium. The mechanism of enhancement is thought to consist of the following two effects: the "phase synchronization" (PS) effect, due to a semi-hard magnetic underlayer, and the "double-layering" (DL) effect, due...
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