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1. 发明授权

US06903894B2 Magnetic disc storage apparatus 失效
标题翻译：磁盘存储装置
公开(公告)号：US06903894B2
公开(公告)日：2005-06-07
申请号：US10012401
申请日：2001-12-12
申请人： Yasuhiko Kokami , Kenji Nishimura , Tatsuya Negishi
发明人： Yasuhiko Kokami , Kenji Nishimura , Tatsuya Negishi
IPC分类号： G11B21/08 , G11B5/012 , G11B5/55 , G11B5/596 , G11B21/10 , G11B23/00 , H02P25/06
CPC分类号： G11B5/5547 , G11B5/012 , G11B23/0007
摘要： A magnetic disc storage apparatus including a magnetic head for reading information from a storage track on a magnetic storage disc driven to spin, a voice coil motor for moving the magnetic head above the disc, and a magnetic head drive system for executing a position control of the magnetic head by controlling driving current of the voice coil motor by a feedback control while monitoring a state of reading the magnetic head in which the magnetic head drive system includes multi-mode driving means for executing a linear drive mode for controlling, as an analog amount, the driving current of the voice coil motor when an amount of driving to move the magnetic head is small and executing a pulse drive mode for controlling, as a digital amount, the driving current of the voice coil motor when the amount of driving to move the magnetic head is large.By the invention, both of high accuracy formation of position control of the magnetic head in tracking and high speed formation of access by shortening seek time are enabled while effectively reducing heating or EMI inducing read/write error.
摘要翻译：一种磁盘存储装置，包括用于从驱动旋转的磁盘上的存储轨道读取信息的磁头，用于使磁头移动到盘上方的音圈电机，以及用于执行位置控制的磁头驱动系统通过控制音圈电动机的驱动电流，同时监视读取磁头的状态，其中磁头驱动系统包括多模驱动装置，用于执行用于控制的线性驱动模式，作为模拟当驱动磁头的驱动量小时，音圈电动机的驱动电流很小，并且执行脉冲驱动模式，用于当驾驶到驾驶员的数量为数字量时控制音圈电动机的驱动电流移动磁头大。通过本发明，可以实现高精度地形成磁头在跟踪中的位置控制和通过缩短查找时间的高速形成访问，同时有效地减少加热或EMI引起的读/写错误。

2. 发明授权

US06975479B2 Magnetic disc storage apparatus 有权
标题翻译：磁盘存储装置
公开(公告)号：US06975479B2
公开(公告)日：2005-12-13
申请号：US10144035
申请日：2002-05-14
申请人： Yasuhiko Kokami , Kenji Nishimura , Tatsuya Negishi
发明人： Yasuhiko Kokami , Kenji Nishimura , Tatsuya Negishi
IPC分类号： G11B21/08 , G11B5/55 , G11B5/596 , G11B21/10 , H02P25/06
CPC分类号： G11B5/5547 , G11B5/022 , G11B5/59605
摘要： There is provided a technique for controlling drive of a voice coil motor which can select, with priority for effective reduction, any one of heat generation and EMI noise which are presumed to induce a read/write error and for simultaneously realizing the positioning control of magnetic head with higher accuracy during the tracking operation and the high speed access with shortening of the seek operation period. The magnetic disc storage apparatus introducing this technique is provided with a mode to drive with linear control a coil of the voice coil motor from both terminals and a mode to drive one terminal of coil with linear control and the other terminal with pulse width control. Thereby, the coil is driven in the drive mode of linear control during the tracking operation, while one terminal of coil is driven with linear control and the other terminal with pulse width control during the seek operation.
摘要翻译：提供了一种用于控制音圈电动机的驱动技术，其可以优先选择被认为引起读/写错误的任何一种发热和EMI噪声，同时实现磁性定位控制在跟踪操作期间具有较高精度的头部，并且通过缩短搜索操作周期进行高速访问。引入该技术的磁盘存储装置具有通过线性控制来驱动来自两端的音圈电动机的线圈和通过线性控制来驱动线圈的一个端子的模式以及具有脉冲宽度控制的另一个端子的模式。由此，在跟踪操作期间，线圈被驱动为线性控制的驱动模式，而线圈的一个端子被线性控制驱动，另一个端子在寻道操作期间具有脉冲宽度控制。

3. 发明申请

US20080061726A1 Control device for synchronous motor 有权
标题翻译：同步电机控制装置
公开(公告)号：US20080061726A1
公开(公告)日：2008-03-13
申请号：US11895406
申请日：2007-08-23
申请人： Yoshitaka Iwaji , Yasuhiko Kokami , Minoru Kurosawa , Junnosuke Nakatsugawa
发明人： Yoshitaka Iwaji , Yasuhiko Kokami , Minoru Kurosawa , Junnosuke Nakatsugawa
IPC分类号： H02P6/08
CPC分类号： H02P6/10 , H02P21/05
摘要： A control technology for a synchronous motor for suppressing rotational pulsation caused by variation in individuals without making a control algorithm complex is provided. In a motor drive system which is a control device for a synchronous motor, in order to suppress the pulsation component of N times as high as the AC frequency for driving the synchronous motor, a controller in which the phase property of the disturbance response of the controller with respect to the pulsation frequency is within ±45° is arranged. Therefore, the torque pulsation component generated from distortion in induction voltage or variation between phases is suppressed.
摘要翻译：提供了一种用于抑制由个体变化引起的旋转脉动的同步电机的控制技术，而不使控制算法复杂化。在作为同步电动机的控制装置的电动机驱动系统中，为了抑制用于驱动同步电动机的交流频率的N倍的脉动分量，控制器将其中的干扰响应的相位特性相对于脉动频率的控制器设置在±45°以内。因此，抑制了感应电压的变形或相位的变化而产生的转矩脉动成分。

4. 发明授权

US07280308B2 Motor drive semiconductor integrated circuit and magnetic disk storage apparatus 有权
标题翻译：电机驱动半导体集成电路和磁盘存储装置
公开(公告)号：US07280308B2
公开(公告)日：2007-10-09
申请号：US11098644
申请日：2005-04-05
申请人： Yasuhiko Kokami
发明人： Yasuhiko Kokami
IPC分类号： G11B5/596
CPC分类号： G11B33/121 , G05B11/28 , G11B5/5547 , G11B25/043
摘要： The Invention provides a motor drive semiconductor integrated circuit for driving and controlling a voice coil motor that can conduct a seek operation, a track follow operation and a settling operation through PWM control, has desired control accuracy and can be produced by a CMOS process. In a voice coil motor drive circuit (200) for executing positioning control of a magnetic head by feedback-controlling a driving current of a voice coil motor (108) for moving a magnetic head (106) over a magnetic disk for reading information from a storage track on the magnetic disk driven for rotation while a read state of the magnetic head is being monitored, head movement control such as a seek operation, a track follow operation etc, of the magnetic head is executed by PWM driving on the basis of a command value from a controller.
摘要翻译：本发明提供了一种用于驱动和控制音圈电动机的电机驱动半导体集成电路，其可以通过PWM控制进行寻道操作，轨道跟随操作和稳定操作，具有期望的控制精度并且可以通过CMOS工艺产生。在用于通过反馈控制音圈电动机（108）的驱动电流来执行磁头的定位控制的音圈电动机驱动电路（200）中，用于使磁头（106）移动到磁盘上，用于从在磁头的读取状态被监视的同时驱动磁盘上的磁盘上的存储轨道，通过PWM驱动来执行磁头的诸如寻道操作，磁道跟随操作等的磁头移动控制，基于来自控制器的命令值。

5. 发明申请

US20070195451A1 Motor drive semiconductor integrated circuit and magnetic disk storage apparatus 审中-公开
标题翻译：电机驱动半导体集成电路和磁盘存储装置
公开(公告)号：US20070195451A1
公开(公告)日：2007-08-23
申请号：US11790520
申请日：2007-04-26
申请人： Yasuhiko Kokami
发明人： Yasuhiko Kokami
IPC分类号： G11B5/596
CPC分类号： G11B33/121 , G05B11/28 , G11B5/5547 , G11B25/043
摘要： The invention provides a motor drive semiconductor integrated circuit for driving and controlling a voice coil motor that can conduct a seek operation, a track follow operation and a settling operation through PWM control, has desired control accuracy and can be produced by a CMOS process. In a voice coil motor drive circuit for executing positioning control of a magnetic head by feedback-controlling a driving current of a voice coil motor for moving a magnetic head over a magnetic disk for reading information from a storage track on the magnetic disk driven for rotation while a read state of the magnetic head is being monitored, head movement control such as a seek operation, a track follow operation etc, of the magnetic head is executed by PWM driving on the basis of a command value from a controller.
摘要翻译：本发明提供了一种用于驱动和控制音圈电动机的电动机驱动半导体集成电路，其可以通过PWM控制进行寻道操作，跟踪跟踪操作和稳定操作，具有期望的控制精度并且可以通过CMOS工艺产生。在用于通过反馈控制音圈电动机的驱动电流的音圈电动机驱动电路中，用于使磁头在磁盘上移动，用于从驱动旋转的磁盘上的存储轨道读取信息在监视磁头的读取状态的同时，通过基于来自控制器的命令值的PWM驱动来执行磁头的诸如寻道操作，磁道跟随操作等的磁头移动控制。

6. 发明申请

US20050036228A1 Magnetic disk storage apparatus 审中-公开
标题翻译：磁盘存储装置
公开(公告)号：US20050036228A1
公开(公告)日：2005-02-17
申请号：US10948220
申请日：2004-09-24
申请人： Reiichi Kimura , Yasuhiko Kokami , Kunihiro Kawauchi , Minoru Kurosawa , Kichiya Itagaki
发明人： Reiichi Kimura , Yasuhiko Kokami , Kunihiro Kawauchi , Minoru Kurosawa , Kichiya Itagaki
IPC分类号： G11B19/28 , G11B19/20 , G11B19/247 , H02P6/00 , H02P6/08 , H02P6/18 , G11B15/46
CPC分类号： G11B19/20 , G11B19/247 , H02P6/08 , H02P6/28
摘要： Currents of sine waveforms can be fed through coils by a relatively small-sized circuit, and thereby, highly dense magnetic storage can be realized with less rotation variations and a driving control circuit of a motor rotating at a low noise level can be provided. A coil of one phase of a three-phase brushless motor is driven with full amplitude at which an applied voltage becomes equal to a source voltage, and a coil of one of other phases is driven with gradually changing voltages so that a current of sine waveform is delivered, and a coil of the remaining phase is driven by feedback control so that a total current flowing through all coils becomes a predetermined current value.
摘要翻译：正弦波形的电流可以通过相对较小尺寸的电路通过线圈馈送，从而可以以较小的旋转变化实现高度密集的磁存储，并且可以提供以低噪声水平旋转的电动机的驱动控制电路。三相无刷电动机的一相线圈以全幅度驱动，施加的电压等于源电压，并且其中一相的线圈以逐渐变化的电压驱动，使得正弦波形的电流并且通过反馈控制驱动剩余相的线圈，使得流过所有线圈的总电流成为预定电流值。

7. 发明申请

US20110074324A1 Control Device for Synchronous Motor 失效
标题翻译：同步电机控制装置
公开(公告)号：US20110074324A1
公开(公告)日：2011-03-31
申请号：US12963392
申请日：2010-12-08
申请人： Yoshitaka Iwaji , Yasuhiko Kokami , Minoru Kurosawa , Junnosuke Nakatsugawa
发明人： Yoshitaka Iwaji , Yasuhiko Kokami , Minoru Kurosawa , Junnosuke Nakatsugawa
IPC分类号： H02P6/10
CPC分类号： H02P6/10 , H02P21/05
摘要： A control technology for a synchronous motor for suppressing rotational pulsation caused by variation in individuals without making a control algorithm complex is provided. In a motor drive system which is a control device for a synchronous motor, in order to suppress the pulsation component of N times as high as the AC frequency for driving the synchronous motor, a controller in which the phase property of the disturbance response of the controller with respect to the pulsation frequency is within ±45° is arranged. Therefore, the torque pulsation component generated from distortion in induction voltage or variation between phases is suppressed.
摘要翻译：提供了一种用于抑制由个体变化引起的旋转脉动的同步电机的控制技术，而不使控制算法复杂化。在作为同步电动机的控制装置的电动机驱动系统中，为了抑制用于驱动同步电动机的交流频率的N倍的脉动分量，控制器将其中的干扰响应的相位特性相对于脉动频率的控制器设置在±45°以内。因此，抑制了感应电压的变形或相位的变化而产生的转矩脉动成分。

8. 发明申请

US20100177444A1 VCM DRIVER AND PWM AMPLIFIER 失效
标题翻译： VCM驱动器和PWM放大器
公开(公告)号：US20100177444A1
公开(公告)日：2010-07-15
申请号：US12728449
申请日：2010-03-22
申请人： Yasuhiko Kokami , Hiroshi Kuroiwa
发明人： Yasuhiko Kokami , Hiroshi Kuroiwa
IPC分类号： G11B5/55
CPC分类号： G11B5/5526 , G11B5/5547
摘要： The present invention provides a VCM driver realizing low power consumption and high accuracy and a PWM amplifier compensating a dead time distortion. A phase compensator, a ΔΣ modulator receiving an output signal of the phase compensator and converting the output signal to a control code of predetermined bits, a PWM modulator receiving the control code to produce a PWM signal, and an output circuit receiving the PWM signal to drive a voice coil constitute a forward path. A sense amplifier sensing a current of the voice coil, an ADC receiving an output signal of the sense amplifier, a low-pass filter receiving an output signal of the ADC, and a decimation filter receiving an output signal of the low-pass filter constitute a feedback path. An output signal of the decimation filter is fed back to the input side of the phase compensator to form a major feedback loop having a first-order characteristic loop gain. An output signal of the decimation filter is fed back to the output side of the phase compensator to form a minor feedback loop having a loop gain which is flat until a target band frequency when viewed from the output side of the phase compensator.
摘要翻译：本发明提供了实现低功耗和高精度的VCM驱动器以及补偿死区时间失真的PWM放大器。相位补偿器，＆Dgr;＆Sgr; 调制器接收相位补偿器的输出信号并将输出信号转换成预定位的控制码;接收控制码以产生PWM信号的PWM调制器;接收PWM信号以驱动音圈的输出电路构成一个前进路径感测放大器，感测音圈的电流，接收读出放大器的输出信号的ADC，接收ADC的输出信号的低通滤波器以及接收低通滤波器的输出信号的抽取滤波器构成反馈路径。抽取滤波器的输出信号被反馈到相位补偿器的输入侧以形成具有一阶特性环路增益的主反馈环路。抽取滤波器的输出信号被反馈到相位补偿器的输出侧，以形成从相位补偿器的输出侧观察到直到目标频带频率为止的环路增益的次级反馈环路。

9. 发明申请

US20090212851A1 POWER SUPPLY UNIT 失效
标题翻译：供电单元
公开(公告)号：US20090212851A1
公开(公告)日：2009-08-27
申请号：US12342710
申请日：2008-12-23
申请人： Osamu YAMASHITA , Yasuhiko Kokami , Masahiro Ishihara , Toshiyuki Tsunoda
发明人： Osamu YAMASHITA , Yasuhiko Kokami , Masahiro Ishihara , Toshiyuki Tsunoda
IPC分类号： G05F1/10
CPC分类号： H02M1/32 , H02M3/158 , H02M2001/0009 , H02M2001/0025
摘要： High-accuracy overcurrent detection is performed, while a loss resulting from the current detection is significantly reduced. A switch section outputs the voltage between the both terminals of a current detection resistor using an AND signal between an output signal from a hysteresis comparator and an output signal from a pre-driver. The voltage is filtered by an electrostatic capacitor element and a resistor, and inputted to a comparator. The comparator makes a comparison between the signals inputted to the two input terminals thereof, and outputs the result of the comparison to a digital filter. When an overcurrent begins to flow in a power supply unit, the levels of the voltages inputted to the two input terminals of the comparator are inverted so that the comparator outputs an inversion signal to the digital filter. The digital filter outputs a detection signal to an overcurrent detection circuit when an arbitrary time has elapsed.
摘要翻译：执行高精度过电流检测，而由电流检测导致的损耗显着降低。开关部分使用来自迟滞比较器的输出信号和来自预驱动器的输出信号之间的AND信号来输出电流检测电阻器的两端之间的电压。电压由静电电容器元件和电阻器滤波，并输入到比较器。比较器对输入到其两个输入端的信号进行比较，并将比较结果输出到数字滤波器。当过电流在电源单元中流动时，输入到比较器的两个输入端的电压的电平被反相，使得比较器向数字滤波器输出反相信号。当任意时间过去时，数字滤波器将检测信号输出到过电流检测电路。

10. 发明授权

US07294982B2 Motor drive device and integrated circuit device for motor driving 有权
标题翻译：电机驱动装置和电机驱动集成电路装置
公开(公告)号：US07294982B2
公开(公告)日：2007-11-13
申请号：US11371243
申请日：2006-03-09
申请人： Minoru Kurosawa , Yasuhiko Kokami
发明人： Minoru Kurosawa , Yasuhiko Kokami
IPC分类号： H02K21/00 , H02K23/00
CPC分类号： G11B19/28
摘要： A three-phase DC motor output stage including a predriver that supplies drive voltages to power MOSFETs supplies output voltages to three-phase coils, monitors whether each of gate-to-source voltages of the power MOSFETs is greater than or equal to a predetermined voltage and thereby detects a current zero cross, and employs the output of such current zero cross detection in PLL control for controlling energization switching timing and thereby forms drive voltages of 180-degree energization. Lower hooks with a voltage minimum phase as GND and upper hooks with a voltage maximum phase as a source are set as patterns alternately repeated for every electrical angle of 60 degrees. The patterns are expressed in linear approximation to generate sine wave-like drive voltages, thereby causing sine wave-like currents to flow into the three-phase coils.
摘要翻译：包括向功率MOSFET提供驱动电压的预驱动器的三相DC电动机输出级将输出电压提供给三相线圈，监视功率MOSFET的栅极至源极电压中的每一个是否大于或等于预定电压从而检测电流零交叉，并且在PLL控制中采用这种电流过零检测的输出来控制通电切换定时，从而形成180度通电的驱动电压。具有电压最小相位为GND的下钩和以电压最大相位为源的上钩被设置为对于60度的每个电角度交替重复的图案。模式以线性近似表示，以产生正弦波状驱动电压，从而使正弦波状电流流入三相线圈。

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