公开(公告)号：US06909572B2

公开(公告)日：2005-06-21

申请号：US10431336

申请日：2003-05-07

申请人： Gianluca Ventura ,  Alberto Salina ,  Alessandra Schenone ,  Fabio Ramaioli ,  Luca Anostini

发明人： Gianluca Ventura ,  Alberto Salina ,  Alessandra Schenone ,  Fabio Ramaioli ,  Luca Anostini

IPC分类号： G11B5/00 ,  G11B5/012 ,  G11B5/54 ,  G11B5/55 ,  G11B21/12 ,  G11B21/02

CPC分类号： G11B5/012 ,  G11B5/54 ,  G11B5/553 ,  G11B21/12 ,  G11B2005/001

摘要： A disk drive system is described which includes a disk having a magnetic surface and a motor for rotating the disk, a magnetic head being movable relative to said magnetic surface. The motor generates a back electromotive force voltage having different phases and the system comprising a plurality of switches for switching the back electromotive force voltage, a control circuit to control the plurality of switches to supply the back electromotive force voltage to direct the head to a parking position. The system also comprises a comparator adapted to compare a single phase of the back electromotive force voltage with the sum of the other phases of the back electromotive force voltage. The comparator generates an output signal representative of the comparation and the system comprises a logic block controlled by the output signal of the comparator. The logic block is adapted to determine time periods and a control sequence of the switches which is associated to the time periods. The control sequence is supplied to the control circuit so that the last generates control signals to control the plurality of switches.

摘要翻译： 描述了一种磁盘驱动器系统，其包括具有磁性表面的盘和用于旋转盘的马达，磁头可相对于所述磁性表面移动。 电动机产生具有不同相位的反电动势电压，并且系统包括用于切换反电动势电压的多个开关，控制电路以控制多个开关以提供反电动势电压以将头引导到停车 位置。 该系统还包括比较器，用于将反电动势电压的单相与反电动势电压的其它相位之和进行比较。 比较器产生表示比较的输出信号，并且系统包括由比较器的输出信号控制的逻辑块。 逻辑块适于确定与时间段相关联的时间段和开关的控制序列。 控制序列被提供给控制电路，使得最后一个产生控制信号以控制多个开关。

公开(公告)号：US06363214B1

公开(公告)日：2002-03-26

申请号：US09661754

申请日：2000-09-14

申请人： Andrea Merello ,  Gianluca Ventura ,  Roberto Peritore

发明人： Andrea Merello ,  Gianluca Ventura ,  Roberto Peritore

IPC分类号： H02P300

CPC分类号： G11B21/12 ,  G11B5/54

摘要： A method for controlling an electromagnetic actuator having an arm connected thereto uses a circuit that temporarily places in a high impedance state output nodes connected to a winding of the electromagnetic actuator. A detected BEMF is compared with a lower threshold and an upper threshold. Current in the electromagnetic actuator is monitored and controlled. A current pulse is provided to the electromagnetic actuator based upon the comparison of the detected BEMF with the lower and upper thresholds. The respective amplitudes of successively provided current pulses having a same polarity are progressively increased, and an amplitude of a provided current pulse having a polarity opposite a polarity of a preceding current pulse is decreased. The amplitude of the driving current pulses provided to the winding of the electromagnetic actuator advantageously adapts automatically to varying frictional conditions, or to any other cause of variation of the mechanical load of the actuator. These conditions occur when the arm moved by the electromagnetic actuator starts to slide up or flies off the parking ramp.

摘要翻译： 用于控制具有与其连接的臂的电磁致动器的方法使用暂时放置在连接到电磁致动器的绕组的高阻抗状态输出节点的电路。 将检测到的BEMF与下阈值和上阈值进行比较。 监测和控制电磁执行器中的电流。 基于检测到的BEMF与下限和上限阈值的比较，向电磁致动器提供电流脉冲。 具有相同极性的连续提供的电流脉冲的相应幅度逐渐增加，并且具有与前一电流脉冲的极性相反的极性的所提供的电流脉冲的幅度减小。 提供给电磁致动器的绕组的驱动电流脉冲的振幅有利地自动地适应于变化的摩擦条件或致动器的机械负载变化的任何其它原因。 当电磁执行器移动的手臂开始向上滑动或从停车斜坡飞走时，会发生这些情况。

公开(公告)号：US06479954B1

公开(公告)日：2002-11-12

申请号：US09609857

申请日：2000-07-05

申请人： Roberto Peritore ,  Andrea Merello ,  Gianluca Ventura

发明人： Roberto Peritore ,  Andrea Merello ,  Gianluca Ventura

IPC分类号： H02P308

CPC分类号： H03F3/72 ,  G11B5/5521 ,  H02P25/034

摘要： A system for controlling and driving an electromagnetic actuator includes a unique operational amplifier in the regulation loop for driving the electromagnetic actuator and for monitoring, during different phases of operation, the current in the actuator and the back electromotive force. The new architecture allows for a considerable reduction of the area of integration of the system as a whole.

摘要翻译： 用于控制和驱动电磁致动器的系统包括用于驱动电磁致动器的调节回路中的唯一运算放大器，并且用于在不同操作阶段期间监视致动器中的电流和反电动势。 新的架构可以大大减少整个系统的整合面积。

公开(公告)号：US06463211B1

公开(公告)日：2002-10-08

申请号：US09693499

申请日：2000-10-20

申请人： Roberto Peritore ,  Alberto Salina ,  Andrea Merello ,  Lorenzo Papillo ,  Francesco Vavala ,  Gianluca Ventura

发明人： Roberto Peritore ,  Alberto Salina ,  Andrea Merello ,  Lorenzo Papillo ,  Francesco Vavala ,  Gianluca Ventura

IPC分类号： H02P500

CPC分类号： G11B5/5526

摘要： The present invention relates to the positioning of the read/write transducer heads of an hard disk (HD) in a designated landing zone when requested or when the electrical power is removed from the drive. In particularly it relates to the detection of the back electromotive force (BEMF) of the motor involved in the positioning of the read/write transducer heads. According to an embodiment of the present invention a BEMF detection circuit for a voice-coil motor operative to continually generate a signal proportionally to the velocity of said voice-coil motor comprises a algebraic summing node producing at its output the BEMF of the voice-coil motor and receiving: a first voltage proportional to the voltage across the voice-coil motor; a second voltage representing the product of a first multiplier factor and a voltage proportional to the current in the coil; a third voltage representing the product of a prefixed bias voltage Vref and a second multiplier factor; said third voltage is calibrated by a single calibration circuitry operative to calibrate said second multiplier factor in response to a calibration control signal, in order to cancel said second voltage.

摘要翻译： 本发明涉及当请求时或当从驱动器移除电力时将硬盘（HD）的读/写换能器头定位在指定的着陆区中。 特别地，其涉及在读/写换能器头的定位中涉及的电动机的反电动势（BEMF）的检测。 根据本发明的实施例，用于音圈电机的BEMF检测电路可操作以连续地产生与所述音圈电动机的速度成比例的信号，包括代数求和节点，在其输出端产生音圈的BEMF 电机和接收：与音圈电机两端的电压成比例的第一电压; 代表第一乘数和与线圈中的电流成正比的电压的乘积的第二电压; 代表预置偏置电压Vref和第二乘数的乘积的第三电压; 所述第三电压由单个校准电路校准，所述单个校准电路用于响应于校准控制信号校准所述第二乘法器因数，以便消除所述第二电压。