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    • 1. 发明申请
    • LINEAR ACTUATOR
    • 线性执行器
    • US20080197719A1
    • 2008-08-21
    • US12106392
    • 2008-04-21
    • Hiroshi NAKAGAWAKazumichi KATOToshio MIKIMinoru MAEDATakashi FUKUNAGAKozo FURUTANIToshiya SUGIMOTO
    • Hiroshi NAKAGAWAKazumichi KATOToshio MIKIMinoru MAEDATakashi FUKUNAGAKozo FURUTANIToshiya SUGIMOTO
    • H02K33/18H02K41/02
    • H01F7/1615H01F7/081H01F7/122H02K7/085H02K21/44H02K33/16H02K41/033
    • An object of the present invention is to provide a linear actuator in which reliability is improved, and performance is also easily improved. The present invention provides a linear actuator including a stator, a movable element having an iron member, and being reciprocatable with respect to the stator, a permanent magnet fixed to the stator so as to be opposed to the iron member, and a coil fixed to the stator. Because both the coil and the permanent magnet are fixed to the stator, electrical current does not have to be supplied to the movable element, and the feeder lines connected to the coil will not be broken due to the movement of the movable element. In addition, the weight of the movable element will not be increased even when the weigh of the permanent magnet is increased in order to obtain high magnetic flux density for improvement in performance. Moreover, because the movable element does not include a magnet, a magnetizing operation does not have to be applied to the movable element. The permanent magnets may be a pair in which the directions the magnetic poles thereof differ from each other, and two pairs of permanent magnets may be provided. The number of magnetic fluxes that run through the magnetic pole elements and the iron member can be increased by providing a magnetic reluctance section around the permanent magnets.
    • 本发明的目的是提供一种可靠性提高的线性致动器,并且性能也容易提高。 本发明提供了一种线性致动器,其包括定子,具有铁构件的可移动元件,并且能够相对于定子往复运动;固定到定子上以与铁构件相对的永磁体,以及固定到 定子。 由于线圈和永磁体均固定在定子上,所以不必向可动元件供电,并且由于可移动元件的移动而连接到线圈的馈线不会被破坏。 此外,为了提高性能,为了获得高的磁通密度,即使永磁体的重量增加,可移动元件的重量也不会增加。 此外,由于可动元件不包括磁体,因此不必对可动元件施加磁化操作。 永磁体可以是彼此不同的磁极方向的一对,并且可以设置两对永磁体。 可以通过在永磁体周围设置磁阻部分来增加穿过磁极元件和铁构件的磁通量的数量。
    • 2. 发明申请
    • JITTER GENERATING DEVICE AND PHASE MODULATING DEVICE
    • 智能发电装置和相位调制装置
    • US20080088386A1
    • 2008-04-17
    • US11870507
    • 2007-10-11
    • Minoru MAEDA
    • Minoru MAEDA
    • H03C3/00
    • H03D7/00
    • A jitter generating device for generating a jitter on a carrier signal includes: a carrier signal generator for generating the carrier signal; a modulation signal generator for generating a modulation signal corresponding to the jitter; an orthogonal modulator for modulating a phase of the carrier signal generated by the carrier signal generator using the modulation signal generated by the modulation signal generator as one of modulation input signals; a DC power supply for applying a DC voltage serving as the other modulation input signal to the orthogonal modulator; and a limiter amplifier for setting an amplitude of an output signal of the orthogonal modulator to be constant.
    • 用于产生载波信号的抖动的抖动产生装置包括:用于产生载波信号的载波信号发生器; 调制信号发生器,用于产生对应于抖动的调制信号; 正交调制器,用于使用由调制信号发生器产生的调制信号作为调制输入信号之一调制由载波信号发生器产生的载波信号的相位; 直流电源,用于将作为另一个调制输入信号的直流电压施加到所述正交调制器; 以及用于将所述正交调制器的输出信号的振幅设定为恒定的限幅放大器。
    • 4. 发明申请
    • MOTOR DRIVING APPARATUS, BRUSHLESS MOTOR, AND METHOD FOR DRIVING THE SAME
    • 电动机驱动装置,无刷电动机及其驱动方法
    • US20090108781A1
    • 2009-04-30
    • US11853298
    • 2007-09-11
    • Minoru MAEDA
    • Minoru MAEDA
    • H02P6/08
    • H02P6/06H02P6/08Y02P80/116
    • A motor driving apparatus has first, second, and third positive-side driving transistors having drains which are supplied with a power supply voltage, first, second, and third negative-side driving transistors having sources which are grounded and drains which are connected to sources of the first, second, and third positive-side driving transistors, respectively, a power supply monitoring circuit which monitors the power supply voltage and outputs a driving mode switching signal which has a first value if the power supply voltage is not less than a predetermined value and has a second value if the power supply voltage is less than the predetermined value, and an output PWM control section which switches a mode of driving from synchronous rectification PWM driving to one-way PWM driving on the basis of a change of the driving mode switching signal from the second value to the first value.
    • 电机驱动装置具有第一,第二和第三正侧驱动晶体管,其具有供给电源电压的漏极,第一,第二和第三负侧驱动晶体管具有接地源和漏极,源极与源极连接 分别具有第一,第二和第三正侧驱动晶体管的电源监视电路,其监视电源电压并输出如果电源电压不小于预定值的驱动模式切换信号,该驱动模式切换信号具有第一值 并且如果电源电压小于预定值则具有第二值;以及输出PWM控制部分,其基于驱动的变化将同步整流PWM驱动的驱动模式切换到单向PWM驱动 模式切换信号从第二值到第一值。