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    • 71. 发明授权
    • Induced voltage reduction method and an induced voltage reduction
apparatus for an induction motor
    • 用于感应电动机的感应电压降低方法和感应电压降低装置
    • US5760567A
    • 1998-06-02
    • US564053
    • 1995-12-14
    • Kosei NakamuraYoshiyuki HayashiHisashi Maeda
    • Kosei NakamuraYoshiyuki HayashiHisashi Maeda
    • H02K17/14H02P1/38H02P23/00H02P25/20
    • H02K17/14H02P1/38H02P23/00H02P25/20
    • A method and apparatus for controlling an induction motor having at least high speed windings and reduced speed windings divides the reduced speed windings into first and second portions. The first and second portions of the reduced speed windings are electrically connected in series and a voltage is applied to the first and second portions of the reduced speed windings when it is desired to operate the induction motor at a reduced speed. The first and second portions of the reduced speed windings are electrically disconnected and a voltage is applied to the high speed windings when it is desired to operate the induction motor at a high speed. The induction motor has three sets of windings extending from a middle region, each set of windings having an inner winding toward the middle region and an outer winding away from the middle region. According to one aspect, a first changeover circuit is electrically connected to each set of windings, between the inner and outer windings for applying a voltage to the outer windings when it is desired to operate the induction motor at a high speed. A second changeover circuit is electrically connected to each set of windings, toward the middle region from the inner windings for applying a voltage to the inner and outer windings when it is desired to operate the induction motor at a reduced speed. It is thus possible to change from a Y configured winding connection to a .DELTA. configured winding connection.
    • PCT No.PCT / JP95 / 00681 Sec。 371 1995年12月14日第 102(e)1995年12月14日日期PCT 1995年4月6日提交PCT公布。 WO95 / 28763 PCT出版物 日期1995年10月26日用于控制具有至少高速绕组和减速绕组的感应电动机的方法和装置将减速绕组分为第一和第二部分。 当希望以降低的速度操作感应电动机时,减速绕组的第一和第二部分串联电连接,并且在减速绕组的第一和第二部分施加电压。 当期望以高速操作感应电动机时,减速绕组的第一和第二部分被电断开并且向高速绕组施加电压。 感应电动机具有从中间区域延伸的三组绕组,每组绕组具有朝向中间区域的内部绕组和远离中间区域的外部绕组。 根据一个方面,当期望以高速操作感应电动机时,第一转换电路电连接到内绕组和外绕组之间的每组绕组,用于向外绕组施加电压。 第二转换电路当期望以降低的速度操作感应电机时,从内绕组电连接到每组绕组,以向内绕组施加电压到内绕组和外绕组的中间区域。 因此可以从Y构造的绕组连接改变为DELTA配置的绕组连接。
    • 78. 发明授权
    • Multiple tool holding punching apparatus
    • 多工具夹紧冲孔机
    • US3972260A
    • 1976-08-03
    • US556408
    • 1975-03-07
    • Yoshiyuki HayashiHideo Morita
    • Yoshiyuki HayashiHideo Morita
    • B26F1/14B21D28/24B21D28/34B21D37/04B21D37/14B26F1/04
    • B21D28/246B21D37/04Y10T83/8727Y10T83/8746
    • This disclosure relates to a punching apparatus for perforating sheet metal or the like, comprising a tool holder having a body portion which includes upper and lower arms extending horizontally from the body portion in vertically spaced alignment from one another to form a throat into which sheet material to be punched may be positioned. Each of the upper and lower arms includes a plurality of spaced bores of different diameters, each of which is vertically aligned with a corresponding bore in the opposite arm. The bores in the upper arm are adapted to receive a plurality of punches of different diameters, while the lower bores are adapted to receive a plurality of dies of different diameters for operatively receiving a corresponding punch during a punching operation. The tool holder is slidably mounted in a work table disposed beneath a vertically movable ram of the apparatus, whereby corresponding ones of punches and dies may be selectively operatively positioned beneath the ram to punch holes of varying diameters.
    • 本公开涉及一种用于穿孔金属片等的冲孔装置,其包括具有主体部分的工具保持器,该主体部分包括从主体部分以彼此垂直间隔的对准水平延伸的上臂和下臂,以形成喉部, 被打孔可能被定位。 上臂和下臂中的每一个包括多个不同直径的间隔开的孔,每个孔与相对臂中的对应孔垂直对准。 上臂中的孔适于容纳多个不同直径的冲头,而下孔适于容纳不同直径的多个模具,以在冲压操作期间可操作地接收相应的冲头。 工具架可滑动地安装在设置在设备的可垂直移动的冲头下方的工作台中,由此对应的冲头和模具可以选择性地操作地定位在冲头下方以具有不同直径的冲孔。