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21. 发明申请

US20090200971A1 DRIVE SYSTEM OF SYNCHRONOUS MOTOR 失效
标题翻译：同步电机驱动系统
公开(公告)号：US20090200971A1
公开(公告)日：2009-08-13
申请号：US12367036
申请日：2009-02-06
申请人： Yoshitaka IWAJI , Yasuhiko Kokami , Minoru Kurosawa
发明人： Yoshitaka IWAJI , Yasuhiko Kokami , Minoru Kurosawa
IPC分类号： H02P6/20 , H02P6/18
CPC分类号： H02P6/20
摘要： A drive system of a permanent magnet motor is constituted of a mode switching trigger generator which monitors a state of a permanent magnet motor and issues a mode switching trigger, a conduction mode determining unit which receives the mode switching trigger and switches the mode of the permanent magnet motor, and a PWM generator which outputs a PWM signal to an inverter in accordance with the output of the conduction mode determining unit. The mode switching trigger is generated on condition that the speed electromotive force of the permanent magnet motor exceeds a constant or variable threshold value.
摘要翻译：永磁电动机的驱动系统由监视永磁电动机的状态并发出模式切换触发的模式切换触发发生器构成，导通模式确定单元接收模式切换触发并切换永久磁铁的模式磁电机和PWM发生器，其根据导通模式确定单元的输出将PWM信号输出到逆变器。在永磁电动机的速度电动势超过常数或可变阈值的条件下产生模式切换触发。

22. 发明申请

US20090080115A1 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：US20090080115A1
公开(公告)日：2009-03-26
申请号：US12169891
申请日：2008-07-09
申请人： Yasuhiko Kokami , Hiroshi Kuroiwa
发明人： Yasuhiko Kokami , Hiroshi Kuroiwa
IPC分类号： G11B5/54
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 ΔS 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，DeltaS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; PWM调制器，接收控制码以产生PWM信号，以及输出电路，接收PWM信号驱动音圈构成前进路径。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。

23. 发明授权

US07492132B2 Switching regulator 有权
标题翻译：开关稳压器
公开(公告)号：US07492132B2
公开(公告)日：2009-02-17
申请号：US11488833
申请日：2006-07-19
申请人： Hiroshi Kuroiwa , Yasuhiko Kokami , Osamu Yamashita
发明人： Hiroshi Kuroiwa , Yasuhiko Kokami , Osamu Yamashita
IPC分类号： G05F1/00 , G05F1/613
CPC分类号： H02M3/156 , H02M2001/0022
摘要： The present invention provides a switching regulator having good stability compatible with a good response and an enhanced protection function. A first capacitor is placed between an output end of an inductor to generate an output voltage and a ground potential. From input voltage, a current is supplied to the inductor's input end by a first switch element. A first feedback path includes a hysteretic comparator. An output voltage added to a voltage proportional to the current flowing through the inductor is supplied to the hysteretic comparator which discriminates whether the voltage is appropriate by hysteresis characteristics and generates a PWM control signal in accordance with an output current variation. Moreover, a second feedback path is provided to feed back an error amplifier output voltage with greater gain in a low frequency domain and an attenuation loop around a PWM frequency band to the comparator's reference voltage input terminal. Feedback voltage through the second feedback path is used as a monitoring voltage in a protection circuit.
摘要翻译：本发明提供了具有良好稳定性的开关调节器，其具有良好的响应和增强的保护功能。电感器的输出端之间放置第一电容器以产生输出电压和接地电位。从输入电压，通过第一开关元件将电流提供给电感器的输入端。第一反馈路径包括滞后比较器。加到与流过电感器的电流成比例的电压的输出电压被提供给迟滞比较器，其通过滞后特性来鉴别电压是否合适，并根据输出电流变化产生PWM控制信号。此外，提供第二反馈路径以将低频域中具有较大增益的误差放大器输出电压和围绕PWM频带的衰减环路反馈到比较器的参考电压输入端子。通过第二反馈路径的反馈电压被用作保护电路中的监视电压。

24. 发明申请

US20080143288A1 Synchronous motor control device 有权
标题翻译：同步电机控制装置
公开(公告)号：US20080143288A1
公开(公告)日：2008-06-19
申请号：US12001799
申请日：2007-12-12
申请人： Yoshitaka Iwaji , Junnosuke Nakatsugawa , Yasuhiko Kokami , Minoru Kurosawa
发明人： Yoshitaka Iwaji , Junnosuke Nakatsugawa , Yasuhiko Kokami , Minoru Kurosawa
IPC分类号： H02P27/08
CPC分类号： H02P6/10 , G11B19/28
摘要： Control technique of a synchronous motor capable of suppressing rotation pulsation caused by individual difference without complicating control algorithm is provided. A pulsation generator superimposing a pulsation component anticipated in advance to a current command for the synchronous motor and a correction current generator superimposing a correction signal substantially having an average value of zero to the current command are provided in a synchronous motor control device. By this configuration, the correction signal suppressing a distortion component is superimposed to a value of the current command with a simplified control configuration. Torque pulsation is suppressed by determining the correction signal from difference between a detection current and a command current.
摘要翻译：提供了能够抑制由个体差异引起的旋转脉动而不复杂的控制算法的同步电机的控制技术。在同步电动机控制装置中设置脉动发生器，该脉动发生器将预先预定的脉动分量叠加到同步电动机的电流指令，以及校正电流发生器将基本上具有平均值零的校正信号叠加到电流指令。通过这种配置，以简化的控制配置将抑制失真分量的校正信号叠加到当前命令的值。通过从检测电流和指令电流之间的差确定校正信号来抑制扭矩脉动。

25. 发明授权

US07071640B2 Rotation drive control circuit of multiphases direct current motor and the start-up method thereof 失效
标题翻译：多相直流电动机的旋转驱动控制电路及其启动方法
公开(公告)号：US07071640B2
公开(公告)日：2006-07-04
申请号：US10684380
申请日：2003-10-15
申请人： Minoru Kurosawa , Kunihiro Kawauchi , Yasuhiko Kokami
发明人： Minoru Kurosawa , Kunihiro Kawauchi , Yasuhiko Kokami
IPC分类号： H02P6/22
CPC分类号： H02P6/20 , H02M7/5395 , H02M2001/0009 , H02P6/182
摘要： In start-up control of a motor in which currents are caused to flow through any two of three phase coils to detect the polarity of a voltage induced in each de-energized phase, thereby determining the corresponding energized phase at start-up thereof, based on the polarity of the detected induced voltage, the levels of induced voltages are detected in addition to the polarity of the induced voltage for the de-energized phase to thereby determine the relationship between the magnitudes thereof, and the energized phase at the start-up is determined based on the relationship of magnitude between the polarity of each induced voltage and the level thereof. In drive control of a multi-phase DC motor wherein a driver for allowing a drive current to flow through each coil is controlled by PWM control signals, and a sine wave-shaped current is caused to flow through each coil to thereby rotatably drive the motor, positive-phase and negative-phase signals are generated as triangular wave carrier signals for generating the PWM control signals, and the PWM control signal related to the corresponding phase coil of the respective phase coils, to which a voltage of an intermediate level is applied by the driver, is generated using a carrier signal opposite in phase to a triangular wave signal used to generate the PWM control signals for other phase coils.
摘要翻译：在电动机的启动控制中，使电流流过三相线圈中的任意两个电流，以检测在每个去激励相位中感应出的电压的极性，从而基于在其启动时确定相应的通电阶段对于检测到的感应电压的极性，除了去激励相的感应电压的极性之外还检测感应电压的电平，从而确定其大小与启动时的通电阶段之间的关系基于每个感应电压的极性与其电平之间的大小关系确定。在通过PWM控制信号控制用于允许驱动电流流过每个线圈的驱动器的多相直流电动机的驱动控制中，并且使正弦波形电流流过每个线圈从而可旋转地驱动电动机产生正相和负相位信号作为用于产生PWM控制信号的三角波载波信号，以及与施加了中间电平的电压的各相线圈相应的相位线圈有关的PWM控制信号由驱动器使用与用于产生其他相位线圈的PWM控制信号的三角波信号相位相反的载波信号来产生。

26. 发明授权

US07054089B2 Magnetic disk storage system 失效
标题翻译：磁盘存储系统
公开(公告)号：US07054089B2
公开(公告)日：2006-05-30
申请号：US10691612
申请日：2003-10-24
申请人： Yasuhiko Kokami
发明人： Yasuhiko Kokami
IPC分类号： G11B15/46
CPC分类号： G11B5/5526 , G11B5/54 , G11B21/02
摘要： The present invention provides a magnetic disk storage system including a spindle motor that rotates a magnetic disk, a spindle motor drive circuit that rotatably drives the spindle motor, a magnetic head that performs reading of information on the magnetic disk, a voice coil motor that moves the magnetic head, and a voice coil motor drive circuit that drives the voice coil motor. When the magnetic head is loaded from a standby position to the surface of the magnetic disk, the rotational speed of the spindle motor is made slower than a rotational speed at a normal operation. Upon power-off, the spindle motor drive circuit is caused to carry out a stepup converter operation to thereby generate a voltage higher than a back electromotive voltage, and causes a control circuit and a drive circuit to operate by the high voltage to thereby enable speed control at the movement of the magnetic head to a predetermined standby position.
摘要翻译：本发明提供一种磁盘存储系统，包括：旋转磁盘的主轴电动机;可旋转地驱动主轴电动机的主轴电动机驱动电路;执行磁盘上的信息读取的磁头;移动的音圈电动机; 磁头和驱动音圈马达的音圈马达驱动电路。当磁头从备用位置装载到磁盘表面时，主轴电动机的转速比正常操作时的转速慢。断电时，使主轴电动机驱动电路进行升压转换器动作，从而产生高于反电动势电压的电压，使控制电路和驱动电路通过高电压进行动作，控制磁头移动到预定待机位置。

27. 发明授权

US06998801B2 Motor drive device and motor drive integrated circuit device 失效
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：US06998801B2
公开(公告)日：2006-02-14
申请号：US11059649
申请日：2005-02-17
申请人： Minoru Kurosawa , Yasuhiko Kokami
发明人： Minoru Kurosawa , Yasuhiko Kokami
IPC分类号： H02P5/06 , G11B15/46
CPC分类号： H02P6/28
摘要： A motor drive device which controls a spindle output predriver unit and power MOSFETs of an output stage associated with it to form a PWM signal in such a manner that a detection current formed by a DC shunt resistor and a sense amplifier and a current instruction signal coincide with each other, generates a regenerative signal obtained by giving dead times to the PWM signal, generates an energizing timing signal from the result of BEMF (back electromotive voltage) zero cross detection and generates signals for controlling on/off of power MOSFETs of three phases to thereby drive a three-phase motor, is provided with a switching characteristic adjustment unit which measures a time at which the spindle output is being transitioned and performs such feedback control that the measured time and a designated switching time coincide with each other.
摘要翻译：电机驱动装置，其控制主轴输出预驱动单元和与其相关联的输出级的功率MOSFET以形成PWM信号，使得由DC分流电阻器和感测放大器形成的检测电流和电流指令信号一致彼此产生通过给PWM信号提供死区时间而获得的再生信号，从BEMF（反电动势）零交叉检测的结果产生通电定时信号，并产生用于控制三相功率MOSFET的通/断的信号为了驱动三相电动机，设置有测量主轴输出正在被转换的时间的开关特性调整单元，并且执行测量时间和指定的切换时间彼此一致的反馈控制。

28. 发明授权

US06801382B2 Magnetic disk storage apparatus 失效
标题翻译：磁盘存储装置
公开(公告)号：US06801382B2
公开(公告)日：2004-10-05
申请号：US10123245
申请日：2002-04-17
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： G11B1546
CPC分类号： H02P6/08 , G11B19/247 , 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。

29. 发明授权

US5818179A Brushless motor drive circuit including a linear amplifier for sending an output signal based upon the detected back electromotive force voltage 失效
标题翻译：无刷马达驱动电路，包括线性放大器，用于基于检测到的反电动势电压发送输出信号
公开(公告)号：US5818179A
公开(公告)日：1998-10-06
申请号：US685857
申请日：1996-07-24
申请人： Yasuhiko Kokami , Satoshi Kondo
发明人： Yasuhiko Kokami , Satoshi Kondo
IPC分类号： H02P6/00 , H02P6/08 , H02P6/14 , H02P7/00
CPC分类号： H02P6/14 , H02P6/08 , H02P6/34 , H02P2209/07 , Y10S388/90 , Y10S388/91
摘要： In a d.c. brushless motor drive circuit, the output amplifier produces a motor winding drive current with dulled rise/fall edges from a detected sinusoidal back e.m.f. voltage induced on the winding during the steady-state operation when the motor runs at the rated speed. The output amplifier includes a set of transistors each brought to a saturated conductive state or a cutoff state in accordance with the phase conduction sequence to connect one end of each motor winding to a ground voltage source, and another transistor operated continuously to connect the neutral point, which is opposite ends of the motor windings connected together, to a power voltage source.
摘要翻译：在d.c. 无刷电动机驱动电路，输出放大器产生电动机绕组驱动电流，具有从检测到的正弦曲线后面的衰减上升/下降沿。当电机以额定转速运行时，在稳态运行期间在绕组上感应的电压。输出放大器包括一组晶体管，每个晶体管根据相导通序列导致饱和导通状态或截止状态，以将每个电机绕组的一端连接到地电压源，另一个晶体管连续工作以连接中性点，其是连接在一起的电机绕组的相对端，连接到电源电压源。

30. 发明授权

US08362727B2 Control device for synchronous motor 失效
标题翻译：同步电机控制装置
公开(公告)号：US08362727B2
公开(公告)日：2013-01-29
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。

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