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1.发明授权System and method for detecting back electromotive force with automatic pole calibration 有权用自动极点校准检测反电动势的系统和方法公开(公告)号：US07385364B1
公开(公告)日：2008-06-10
申请号：US11806394
申请日：2007-05-31
发明人： Sakti Pada Rana
CPC分类号： H02P6/182
摘要： A system and method for determining the rotational speed of a motor, such as a three-phase disk drive motor, detects back electromotive force voltage generated during operation of the motor with an automatic pole calibration to minimize or eliminating variations in the wave of a freeze signal. A phase voltage at a winding is compared against a center tap (CT) voltage. Once the phase voltage falls to a specified voltage level, a detect signal is generated. A predetermined time after the detect signal is generated, a freeze signal is generated for freezing at least the circuit associated with the winding.
摘要翻译： 用于确定诸如三相盘驱动电动机之类的电动机的转速的系统和方法用自动极校准来检测在电动机操作期间产生的反电动势电压，以最小化或消除冻结波中的变化 信号。 将绕组的相电压与中心抽头（CT）电压进行比较。 一旦相电压下降到指定的电压电平，就产生检测信号。 产生检测信号之后的预定时间，产生冻结信号，至少冻结与绕组相关的电路。
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2.发明授权公开(公告)号：US07839102B1
公开(公告)日：2010-11-23
申请号：US12493944
申请日：2009-06-29
发明人： Sakti Pada Rana , Vishnu Kumar , Siew Yong Chui
CPC分类号： G11B21/12
摘要： A circuit system and process utilizes back electromotive force (BEMF) voltage to assist in safe power down of devices, such as the read/write head in from low factor disk drives or similar devices. The BEMF voltage from a motor device, such as a spindle motor utilized in a circuit using negative voltage to drive some switches, such as positive channel metal oxide semiconductor (“PMOS”) driver transistors, to reduce and/or effectively minimize the on-resistance of the switches while delivering the current from BEMF voltage of the motor to another device, such as a motor that retracts controls a read/write head.
摘要翻译： 电路系统和过程利用反电动势（BEMF）电压来帮助设备的安全断电，例如来自低因素盘驱动器或类似装置的读/写头。 来自电机装置的BEMF电压，例如在使用负电压驱动一些开关的电路中使用的主轴电动机，例如正通道金属氧化物半导体（“PMOS”）驱动器晶体管，以减少和/或有效地最小化在线， 将电流从电动机的BEMF电压传递到另一装置，例如缩回控制读/写头的电动机的开关电阻。
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3.发明授权公开(公告)号：US07560883B1
公开(公告)日：2009-07-14
申请号：US12026274
申请日：2008-02-05
发明人： Sakti Pada Rana
CPC分类号： G11B21/12
摘要： A circuit system and process utilizes back electromotive force (BEMF) voltage to assist in safe power down of devices, such as the read/write head in from low factor disk drives or similar devices. The BEMF voltage from a motor device, such as a spindle motor utilized in a circuit using negative voltage to drive some switches, such as positive channel metal oxide semiconductor (“PMOS”) driver transistors, to reduce and/or effectively minimize the on-resistance of the switches while delivering the current from BEMF voltage of the motor to another device, such as a motor that retracts controls a read/write head.
摘要翻译： 电路系统和过程利用反电动势（BEMF）电压来帮助设备的安全断电，例如来自低因素盘驱动器或类似装置的读/写头。 来自电机装置的BEMF电压，例如在使用负电压驱动一些开关的电路中使用的主轴电动机，例如正通道金属氧化物半导体（“PMOS”）驱动器晶体管，以减少和/或有效地最小化在线， 将电流从电动机的BEMF电压传递到另一装置，例如缩回控制读/写头的电动机的开关电阻。
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