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85 条记录 (耗时 0.014 秒)

    Electronic speed and slowing down control with intrinsic safety
    2.
    发明授权
    Electronic speed and slowing down control with intrinsic safety 失效
    电子速度和减速控制本质安全

    公开(公告)号：US4460862A

    公开(公告)日：1984-07-17

    申请号：US263913

    申请日：1981-05-15

    申请人： Fausto L. Espinosa ,  Ramon R. Alejandre

    发明人： Fausto L. Espinosa ,  Ramon R. Alejandre

    IPC分类号： B66B1/30 ,  H02P25/26 ,  H02P3/22 ,  H02P3/20

    CPC分类号： B66B1/30 ,  H02P25/26

    摘要： An electronic system is disclosed for controlling both the ascendant and the descendant speed in vertical machines such as cranes, elevators, etc., in which it is required to lift different loads in a regulated and self-controlled manner, laying aside the traditional mechanical and/or pneumatic control systems. Such control is achieved by virtue of the voltages included in the secondary of the motors of the wound rotor type used in such machines to lift or to bring down different loads, which may vary within a wide range from practically the vacuum to an overload, being possible by such control to select and to maintain both the ascendant and the descendant speed of the load.

    摘要翻译： 公开了一种电子系统，用于控制垂直机器如起重机，电梯等中的上升速度和后裔速度，其中需要以调节和自我控制的方式提升不同的负载，将传统的机械和 /或气动控制系统。 这种控制是通过在这种机器中使用的缠绕转子类型的电动机的次级中包括的电压来实现的，以提升或降低不同的负载，其可以在从实际上的真空到过载的宽范围内变化， 可能通过这样的控制选择和维持负载的上升速度和后代速度。

    Electronic control system for motors and the like
    3.
    发明授权
    Electronic control system for motors and the like 失效
    电动机用电子控制系统等

    公开(公告)号：US4065804A

    公开(公告)日：1977-12-27

    申请号：US579526

    申请日：1975-05-21

    申请人： Rolf A. Rostad

    发明人： Rolf A. Rostad

    IPC分类号： H02H7/08 ,  H02P1/08 ,  H02P1/20 ,  H02P25/26 ,  H02P27/02 ,  H02H3/10

    CPC分类号： H02P1/08 ,  H02H7/0833 ,  H02P1/20 ,  H02P25/26 ,  H02P27/02

    摘要： A controller for a motor or like electrical equipment. A thyristor in series with a power conductor that feeds the equipment and a control circuit for activating the gate terminal of the thyristor in accordance with the operating conditions of the equipment. The control circuit includes a transformer having a secondary winding connected to the gate terminal and means for varying the current flow in the secondary winding according to load demands. A three phase system having a thyristor in each conductor and a transformer secondary winding for each thyristor, which windings are on a common core.

    摘要翻译： 用于电动机或类似电气设备的控制器。 与供电设备的电力导体串联的晶闸管，以及根据设备的工作条件启动晶闸管的栅极端子的控制电路。 控制电路包括具有连接到栅极端子的次级绕组的变压器和用于根据负载需求改变次级绕组中的电流的装置。 在每个导体中具有晶闸管的三相系统和每个晶闸管的变压器次级绕组，这些绕组在公共芯上。

    Electronic frequency sensor
    4.
    发明授权
    Electronic frequency sensor 失效
    电子频率传感器

    公开(公告)号：US3988685A

    公开(公告)日：1976-10-26

    申请号：US555162

    申请日：1975-03-04

    申请人： Ronald Wayne Hughes

    发明人： Ronald Wayne Hughes

    IPC分类号： H02P23/00 ,  H02P25/26 ,  H03K1/18

    CPC分类号： H02P25/26 ,  H02P23/22

    摘要： A motor speed control system in which the rotor output frequency is filtered to remove slot noise and applied to one or more frequency discriminator units (FDU's) which provide control signals to operate relays which control contactors in a conventional motor controller having rotor speed control resistances. Each FDU compares the input frequency with its own setpoint frequency and operates to change rotor circuit resistance if the input frequency differs from the setpoint by a predetermined amount. The rotor signal is separated into two rectangular wave signals, one of which triggers a monostable circuit. The Q and Q monostable outputs are compared with the input in logic circuit means which produces a relay driving output under specified signal time-overlap conditions. A feedback signal changes the duty cycle of the monostable when the output is provided, thereby establishing a frequency "dead band" bracketing the setpoint. A "low signal" circuit insures a predetermined state of the FDU under low level or zero frequency conditions. The output operation can be reversed for counter torque motor deceleration applications.

    摘要翻译： 一种电动机速度控制系统，其中转子输出频率被滤波以去除缝隙，并施加到一个或多个频率鉴别器单元（FDU），其提供控制信号以操作具有转子速度控制电阻的常规电动机控制器中控制接触器的继电器。 每个FDU将输入频率与其自己的设定点频率进行比较，并且如果输入频率与设定值不同预定量，则操作以改变转子电路电阻。 转子信号分为两个矩形波信号，其中一个触发单稳态电路。 将Q和Q单稳态输出与在指定信号时间重叠条件下产生继电器驱动输出的逻辑电路装置中的输入进行比较。 当提供输出时，反馈信号改变单稳态的占空比，从而建立包围设定值的频率“死区”。 “低信号”电路在低电平或零频率条件下确保FDU的预定状态。 逆转矩电机减速应用可以反转输出操作。

    Dynamic braking of wound motor polyphase induction motors
    5.
    发明授权
    Dynamic braking of wound motor polyphase induction motors 失效
    绕线电机多相感应电动机的动态制动

    公开(公告)号：US3699416A

    公开(公告)日：1972-10-17

    申请号：US3699416D

    申请日：1971-07-02

    申请人： SEVCON ENG LTD

    发明人： SLOAN ALBERT EVERETT ,  TURNBULL ALISTAIR GORDON

    IPC分类号： H02P3/24 ,  H02P25/26 ,  H02P3/22

    CPC分类号： H02P25/26 ,  H02P3/24

    摘要： A circuit for effecting dynamic braking of a wound rotor polyphase induction motor comprises rectifier means for rectifying the output of the rotor and switch means which disconnect the stator from the mains supply and connect the rectified rotor output through a d.c. chopper to one or more phase windings of the stator to effect dynamic braking of the motor. The level of direct current in the stator phase windings, and hence the degree of braking, is controlled by the d.c. chopper, which may also be employed to control the driving speed of the motor.

    摘要翻译： 用于实现缠绕转子多相感应电动机的动态制动的电路包括整流装置，用于整流转子的输出和开关装置，其将定子与电源断开，并将经整流的转子输出端连接到直流电。 斩波器到定子的一个或多个相绕组，以实现电动机的动态制动。 定子相绕组中的直流电平以及制动的程度由直流电流控制。 斩波器，也可用于控制电机的驱动速度。

    Speed regulating and control system for plural-phase-wound-rotor induction motors
    6.
    发明授权
    Speed regulating and control system for plural-phase-wound-rotor induction motors 失效
    用于多相绕线电感电机的速度调节和控制系统

    公开(公告)号：US3586935A

    公开(公告)日：1971-06-22

    申请号：US3586935D

    申请日：1969-01-09

    申请人： OSCAR E LUNDELIUS SR ,  JOHN G TITTLE SR

    发明人： LUNDELIUS OSCAR E SR ,  TITTLE JOHN G SR

    IPC分类号： H02P25/26 ,  H02K17/34

    CPC分类号： H02P25/26

    摘要： A motor control system for controlling the speed of a threephase wound-rotor induction-type electric motor. Silicon controlled rectifiers are connected in circuit with the rotor windings of the motor for controlling the current flow therein. A control circuit is connected to the gate electrode of each of the silicon controlled rectifiers for firing same. These control circuits are responsive to the rotor winding voltages for determining the phase angles at which the silicon controlled rectifiers are fired. This control action acts to hold the motor speed constant under varying load conditions. Adjustable bias circuit means are connected to each of the control circuits for changing the basic operating speed of the motor.