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    • 8. 发明授权
    • Method and apparatus for dynamic low voltage spindle motor operation
    • 动态低压主轴电动机运行方法和装置
    • US5633568A
    • 1997-05-27
    • US481817
    • 1995-06-06
    • John Dunfield
    • John Dunfield
    • G11B5/54G11B19/04G11B19/20G11B21/08
    • G11B19/20G11B5/54G11B19/04
    • A spindle motor operates dynamically in one of two modes for a disc drive. During power-up, the disc drive electronics are configured to operate the motor in a line-to-line configuration, thus assuring generation of adequate torque. An operating condition circuit senses when the motor has attained substantially the desired running velocity .omega., after which, the drive electronics are dynamically reconfigured to operate the spindle motor in a line-to-neutral mode. A power interruption circuit senses when the source power supply V.sub.cc voltage level is too low or turned off, thereafter initiating a reconfiguration back to line-to-line mode, wherein the highest voltage pair of motor windings are electrically held across the source power supply V.sub.cc lines. Simultaneously, a switching circuit electrically connects the V.sub.cc lines across the transducer positioning voice coil motor in the disc drive, thereby delivering current from the spindle motor to the voice coil. Because only one spindle motor winding is powered during normal operation, a back EMF voltage may be developed in a single winding to a level to just below the source power supply V.sub.cc level while still able to maintain motor operation. The reconfiguration to line-to-line mode allows for the series connection of two windings, necessarily contributing the back EMF energy from a pair of windings to the voice coil providing sufficient energy to cause the voice coil motor to park the transducer in a designated disc landing zone or on a ramp.
    • 主轴电机以两种模式之一动态运行,用于磁盘驱动器。 在上电期间,盘驱动器电子器件被配置为以线对线配置来操作电动机,从而确保产生足够的扭矩。 操作条件电路检测电动机何时达到所需的运行速度ω,之后驱动电子装置被动态地重新配置成以线对中线的方式操作主轴电动机。 电源中断电路检测何时源电源Vcc电压电平太低或关闭,此后启动重新配置回线路模式,其中电动机绕组的最高电压对被电气保持在源电源Vcc 线条。 同时,切换电路将Vcc线电连接到盘驱动器中的换能器定位音圈电动机上,从而将电流从主轴电动机传递到音圈。 由于在正常操作期间只有一个主轴电机绕组供电,所以可以将单个绕组中的反电动势电压开发到低于源电源Vcc电平的水平,同时仍然能够保持电机运行。 重新配置为线对线模式允许两个绕组的串联连接,必然导致从一对绕组到音圈的反电动势能量提供足够的能量以使音圈电机将换能器停放在指定的盘 着陆区或斜坡。