公开(公告)号：US5012166A

公开(公告)日：1991-04-30

申请号：US460990

申请日：1990-01-04

申请人： Nobuyoshi Ushijima ,  Hiroshi Masuda ,  Akira Ishibashi ,  Masahiko Satou ,  Toshiyuki Haruna ,  Norikazu Takayama ,  Yoshinobu Kudou

发明人： Nobuyoshi Ushijima ,  Hiroshi Masuda ,  Akira Ishibashi ,  Masahiko Satou ,  Toshiyuki Haruna ,  Norikazu Takayama ,  Yoshinobu Kudou

IPC分类号： G11B19/20 ,  G11B19/28

CPC分类号： G11B19/2009 ,  G11B19/28

摘要： A control method for brushless DC motor having a rotor, a plurality of magnetic poles and coils of a plurality of phases involves sequentially applying a current to one phase for a prescribed time, stopping the current temporarily and then reapplying the current to the same phase. The state of the rise of the current when it begins to flow to the phase, is measured. The position of one of the magnetic poles located at a position opposite to the particular phase is detected based on the measured state of the rise of the current. In response to the position of the magnetic pole, it is determined whether the flow of the current is to be switched over to the following phase or not. If so, the current is switched over the following phase and the process is repeated. Constant speed control may be accomplished by reading information from a driven disk to determine speed, comparing the speed to a fixed speed, and selectively applying by time sharing a normal current, a brake current and an acceleration current.

摘要翻译： 具有转子，多个磁极和多相的线圈的无刷直流电动机的控制方法涉及顺序地向一相施加电流达规定时间，暂时停止电流，然后将电流重新施加到同一相位。 测量当电流开始流向相的上升状态。 基于测量的电流上升的状态，检测位于与特定相位相反的位置的一个磁极的位置。 响应于磁极的位置，确定电流的流动是否切换到后续阶段。 如果是，则将电流切换到以下阶段，并重复该过程。 可以通过从驱动盘读取信息来确定速度，将速度与固定速度进行比较，并且通过分配正常电流，制动电流和加速电流的时间选择性地施加来实现恒速控制。

公开(公告)号：US4984100A

公开(公告)日：1991-01-08

申请号：US380199

申请日：1989-07-14

申请人： Norikazu Takayama ,  Nobuyoshi Ushijima ,  Tetsuzo Kobashi ,  Masahiko Sato ,  Yoshihiko Yano ,  Jun Isozaki ,  Kousuke Fujii ,  Yoshinobu Kudoh

发明人： Norikazu Takayama ,  Nobuyoshi Ushijima ,  Tetsuzo Kobashi ,  Masahiko Sato ,  Yoshihiko Yano ,  Jun Isozaki ,  Kousuke Fujii ,  Yoshinobu Kudoh

IPC分类号： G11B5/596 ,  G11B20/14 ,  G11B27/30

CPC分类号： G11B5/59655 ,  G11B20/1426 ,  G11B27/3027

摘要： A method of forming servo information in a magnetic disk apparatus of a sector servo system. Servo information is recorded in advance at the beginning of each of the sectors, and includes a DC erase signal, a track address signal and a burst signal. The track address signal indicates on which track of the magnetic disk the sector is located, and is formed by expressing the track address in Gray code and interleaving a dummy code into the Gray code. Servo information is recorded using an NRZI system or an RLL coding method. Servo information in which the dummy code is interleaved is decoded after the dummy code is removed at the time of demodulation.

摘要翻译： 一种在扇区伺服系统的磁盘装置中形成伺服信息的方法。 伺服信息预先记录在每个扇区的开始处，并且包括DC擦除信号，轨道地址信号和突发信号。 轨道地址信号指示扇区所在的磁盘的哪个磁道，并且通过以格雷码表示轨道地址并将伪码交织到格雷码中而形成。 使用NRZI系统或RLL编码方法记录伺服信息。 在解调时，在伪码被去除之后，对其中交织了伪码的伺服信息进行解码。