Reversible electric drive with bidirectional back-current brake and fed
by a rectifier supplied from alternating current mains, preferably for
motor arc furnace regulators
    6.
    发明授权
    Reversible electric drive with bidirectional back-current brake and fed by a rectifier supplied from alternating current mains, preferably for motor arc furnace regulators 失效
    具有双向回流制动器的可逆电驱动器,由交流电源供电的整流器供电,优选用于电动机电弧炉调节器

    公开(公告)号:US4396877A

    公开(公告)日:1983-08-02

    申请号:US246477

    申请日:1981-03-23

    摘要: A reversible electric drive with bidirectional back-current brakes fed by a rectifier supplied from a pair of A.C. power lines for a D.C. motor having two directions of rotation and two poles, comprises a control rectifier bridge for each direction of rotation, each bridge having two branches each containing a diode which is common to both bridges, a shunt resistor for each direction of rotation which is identical with a braking resistor for each other direction of rotation connected in series with the motor for each bridge, each bridge having two other branches each containing a rectifier thyristor with cathodes of each rectifier thyristor connected to a common point. The common point of each bridge is connected to one of the poles of the motor with a control thyristor connected to each common point in series with each respective shunt resistor of each bridge and connected to each other by a connecting point. The common diode is connected to the connecting point, and a braking thyristor is provided between a connecting point of each braking thyristor is provided between a connecting point of each shunt resistor and its respective control thyristor and the common points respectively.

    摘要翻译: 具有由用于具有两个旋转方向和两极方向的直流电动机的一对AC电力线提供的整流器馈送的具有双向逆流制动器的可逆电驱动器包括用于每个旋转方向的控制整流桥,每个桥具有两个 每个桥具有两个桥两个共同的二极管,每个旋转方向的分流电阻器,与用于每个桥接器与电动机串联的每个其他旋转方向的制动电阻器相同,每个桥接器具有两个其他分支 包含整流晶闸管,其每个整流晶闸管的阴极连接到公共点。 每个桥的公共点连接到电动机的极之一,控制晶闸管连接到每个公共点,每个公共点与每个桥的每个相应的分流电阻串联,并通过连接点彼此连接。 公共二极管连接到连接点,并且在每个制动晶闸管的连接点分别设置在每个分流电阻器的连接点及其相应的控制晶闸管和公共点之间的制动晶闸管。

    Process for the preparation of solid pharmaceutical compositions
    9.
    发明授权
    Process for the preparation of solid pharmaceutical compositions 失效
    制备固体药物组合物的方法

    公开(公告)号:US5240662A

    公开(公告)日:1993-08-31

    申请号:US827397

    申请日:1992-01-29

    摘要: The invention relates to a process for the preparation of solid pharmaceutical compositions. More specifically, the invention relates to a process for the preparation of tablets ensuring an increased active ingredient release, where said tablets comprise as active ingredient a mixture of L-3,4-dihydroxyphenylalanine and L-alpha-hydrazino-alpha-methyl-3,4-dihydroxyphenyl propionic acid in a (3-12):1 mass to mass ratio, which comprises admixing any of L-3,4-dihydroxyphenylalanine and L-alpha-hydrazino-alpha-methyl-3,4-dihydroxyphenyl propionic acid, or both of them, with a hydrophilic diluent, preferably lactose and/or microcrystalline cellulose, and optionally with a colouring agent, blending the mixture thus obtained with auxiliary agents conventionally used for the preparation of tablets and optionally with the other active ingredient, furthermore with a solution of stearin in an appropriate solvent, preferably an alkanol comprising 2 to 4 carbon atoms, drying and granulating the mixture thus obtained, optionally admixing further auxiliary agent(s) to the dry granulate, compressing it into tablets comprising 50 to 70% by mass of active ingredient and, if desired, applying a film-coating onto the surface of the tablets thus obtained. The process according to the invention provides tablets of appropriate quality with rapid active ingredient release.