薄型ＦＤＤ用スピンドルモータのインデックス位置検出手法

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タイトル別名
  • Index Position Detecting Method of Spindle Motor for Slim Floppy Disk Drive.
  • ウスガタ FDDヨウ スピンドル モータ ノ インデックス イチ ケンシュツ

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Slim Floppy Disk Drive, which could be mounted on a Hand-held personal computer, is now under intensive study in Japan. Spindle motor for Floppy Disc Drive has a index position detecting means, a index magnet attached to the outer wall of the periphery of the rotor yoke, and a magnetic sensor detecting the magnetic flux from the index magnet. As a result, spaces for providing the index magnet and the magnetic sensor prevent the motor from being made smaller in size and thinner in thickness.<br>This paper describes the method for detecting index position of a spindle motor without both the index magnet and the magnetic sensor. This method detects a index position per rotation from two different kinds of frequency generating signals (Main FG and Sub FG) through a index detecting circuit. The thin spindle motor applied this index detecting method performed a smaller degree of rotational speed variation compared with another wellknown one without both the index magnet and the magnetic sensor. This index detecting method is most suitable for less-inatia-thin spindle motor, and is easy to assemble.

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