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    • 52. 发明授权
    • A.C. motor drive method and apparatus for precision positional control
    • 交流电机驱动方法及精密位置控制装置
    • US4962976A
    • 1990-10-16
    • US445480
    • 1989-12-04
    • Isao TakahashiMakoto Iwata
    • Isao TakahashiMakoto Iwata
    • G05D3/12G05B19/23H02P3/06H02P27/06
    • G05B19/232G05B2219/34047G05B2219/41293G05B2219/41319G05B2219/42171G05B2219/42237
    • A polyphase induction motor is driven from an inverter having a set of switches activated in prescribed on-off patterns to provide forward and reverse voltage vectors and a zero vector for controllably energizing the motor. Memories are provided on which there are written forward voltage vector data for forwardly energizing the motor, reverse voltage vector data for reversely energizing the motor, and zero vector data for de-energizing the motor. The voltage vector data and zero vector data are selectively read out from the memories in order to cause the inverter to generate in real time the corresponding voltage vectors and zero vectors needed for the motor to be quickly revolved to, and set out of rotation exactly in, a desired angular position. For such optimum motor speed control an ideal control curve is predefined which represents the ideal relationship between the motor speed and the difference between the actual and the desired angular position of the motor. The voltage vector data and zero vector data are read out from the memories so that an actual control curve representative of the actual relationship between the motor speed and the difference between the actual and the desired angular position may approximate the ideal control curve as closely as possible.
    • 多相感应电动机由具有以规定开关模式激活的一组开关的逆变器驱动以提供正向和反向电压矢量,以及用于可控制地给电动机供电的零矢量。 提供存储有正向电压矢量数据的正向电压矢量数据,用于使电动机正向通电,反向电压矢量数据反向通电电动机,零矢量数据使电动机断电。 从存储器中选择性地读出电压矢量数据和零矢量数据,以便使得逆变器实时产生电动机所需的相应的电压矢量和零矢量被快速地旋转到正好位于旋转中的旋转 ,期望的角度位置。 对于这种最佳的电动机速度控制,预先确定理想的控制曲线,其表示电动机速度与电动机的实际和期望角度位置之间的差的理想关系。 从存储器中读出电压矢量数据和零矢量数据,使得表示电动机速度与实际角度与期望角度位置之差的实际关系的实际控制曲线可以尽可能接近理想的控制曲线 。
    • 55. 发明授权
    • Circuit breaker
    • 断路器
    • US4550356A
    • 1985-10-29
    • US559085
    • 1983-12-07
    • Isao Takahashi
    • Isao Takahashi
    • H01H33/16H02H7/22
    • H01H33/161
    • Disclosed is a circuit breaker comprising an interruptor including a main contact and a series circuit connected in parallel to the main contact and constituted by a breaking resistor and a resistor contact; and an actuator device for performing closing to opening operations of the main contact and the resistor contact; in which the breaking resistor includes a first resistor element and a second resistor element having a resistance value which is smaller than that of the first resistor element; and in which a switching circuit is provided for automatically changing the connection of the first and second resistor elements such that in small capacitive current breaking, an equivalent resistance of the first and second resistor element becomes a large value suitable for the small current breaking, while in short-circuit current breaking, the resultant equivalent resistance becomes a small value for the short-circuit current breaking mainly owing to the resistance value of said second resistor element.
    • 公开了一种断路器,包括一个断路器,该断路器包括与主触点并联连接并由断路器和电阻触头构成的主触点和串联电路; 以及用于执行关闭所述主触头和所述电阻器触点的打开操作的致动器装置; 其中所述断开电阻器包括第一电阻器元件和具有小于所述第一电阻器元件的电阻值的电阻值的第二电阻器元件; 并且其中设置有用于自动改变第一和第二电阻器元件的连接的开关电路,使得在小的电容电流断开期间,第一和第二电阻器元件的等效电阻变为适合于小电流断开的大值,而 在短路电流断开中,主要由于所述第二电阻元件的电阻值,所得的等效电阻成为短路电流断开的小值。
    • 56. 发明授权
    • Liquid-level meter
    • 液位计
    • US4244219A
    • 1981-01-13
    • US964298
    • 1978-11-28
    • Isao Takahashi
    • Isao Takahashi
    • G01F23/44G01F23/00G01F23/40G01F23/10
    • G01F23/0023G01F23/443
    • A liquid level meter having a first and second rotatable shaft mounted within a housing coaxially one within the other and coupled for relative rotation. A drum is mounted on one shaft and has a float suspended therefrom, for engagement with the liquid. Detecting means for sensing the torque on the drum is provided comprising an energy source and an energy receiver and a pair of relatively movable shield means located therebetween. One of the shield means is conjointly movable with one shaft and the other shield means is conjointly movable with the second shaft. Each of the shield means has spaced apertures aligned respectively with each other to permit selective passage of energy between the source and receive depending upon the degree of relative movement of the shield plates. A signal is produced in response to the sensing of energy variation which operates a motor coupled to one shaft to drive the same and consequently to rotate the other shaft in the direction of the torque exerted on the drum. An indicator showing the level of liquid in response to the degree of movement of the motor is also provided.
    • 一种液位计,其具有第一和第二可旋转轴,该第一和第二可转动轴同轴地安装在一个外壳内并连接以便相对转动。 滚筒安装在一个轴上并具有悬挂在其上的浮子,用于与液体接合。 提供了用于感测鼓上的扭矩的检测装置,其包括能量源和能量接收器以及位于其间的一对相对可移动的屏蔽装置。 屏蔽装置中的一个可与一个轴联合移动,另一个屏蔽装置可与第二轴联动。 每个屏蔽装置具有彼此分开对准的间隔开的孔,以允许根据屏蔽板的相对运动的程度在源和接收之间选择性地通过能量。 响应于能量变化的感测而产生信号,该信号操作耦合到一个轴的马达以驱动它,并且因此在施加在滚筒上的扭矩的方向上使另一个轴旋转。 还提供了显示响应于电动机的移动程度的液体水平的指示器。