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142 records (took 0.033 seconds)

    Electronic dynamic braking for tape recorder devices
    41.
    发明授权
    Electronic dynamic braking for tape recorder devices 失效
    磁带录音机的电子动态制动

    公开(公告)号：US3895277A

    公开(公告)日：1975-07-15

    申请号：US36347673

    申请日：1973-05-24

    Applicant: SYCOR INC

    Inventor： KLUMPP MARLIN K

    IPC: G11B15/48 ,  H02P3/10 ,  H02P3/20

    CPC classification number: G11B15/48 ,  H02P3/10

    Abstract: For use in a tape transport including a drive motor for transporting tape across a recording or playback head, and a motor drive circuit for selectively applying drive current to the motor, an electrical circuit for applying a reverse drive current to the motor for rapidly reducing the speed of the drive motor upon the receipt of a stop signal. The circuit provides controlled reverse current to the drive motor over a period of time initiated by a stop signal and extending until a predetermined reduced speed is reached after which the reverse drive signal is removed and the motor allowed to coast to a halt.

    Abstract translation: 对于包括用于在记录或重放头上传送带的驱动电动机的磁带传送和用于选择性地向电动机施加驱动电流的电机驱动电路，用于向电动机施加反向驱动电流以快速减少 在接收到停止信号时驱动电机的速度。 该电路在由停止信号启动的一段时间内向驱动电动机提供受控的反向电流，并延伸直到达到预定的降低的速度，之后去除反向驱动信号并使电动机惯性停止。

    Direct current power control circuit
    42.
    发明授权
    Direct current power control circuit 失效
    直流电源控制电路

    公开(公告)号：US3843912A

    公开(公告)日：1974-10-22

    申请号：US37248573

    申请日：1973-06-22

    Applicant: GEN ELECTRIC

    Inventor： ANDERSON A

    IPC: H02M3/137 ,  H02P3/10 ,  H02P7/29 ,  H02P5/16

    CPC classification number: H02M3/137 ,  H02P3/10 ,  H02P7/29

    Abstract: A control circuit for controlling the effective power to a load from a power source of substantially constant direct current voltage in which the amount of effective power delivered to the load is controlled by controlling the percentage of time that the load and the power source are interconnected. Included within the system is a switching device preferably of the solid-state type which is alternately placed in the conductive and nonconductive state to vary the percentage of time. Two forms are included, the first being essentially a low power form and the second a dual level type of control system in which it is possible to alternate selectively between two modes of operation to operate the control circuit in a high and low power mode. Also provided is the application of the dual mode system to a direct current motor control system for providing what in the art is known as plugging.

    Abstract translation: 一种控制电路，用于通过控制负载和电源互连的时间百分比来控制来自基本上恒定的直流电压的电源对负载的有效功率，其中传送到负载的有效功率的量被控制。 系统中包括优选为固态的开关器件，其交替地置于导电和非导通状态以改变时间百分比。 包括两种形式，第一种是基本上是低功率形式，第二种是双电平型控制系统，其中可以选择性地在两种操作模式之间交替以在高功率和低功率模式下操作控制电路。 还提供了将双模式系统应用于直流电动机控制系统，用于提供本领域中已知的堵塞。

    Spinning turbine having speed-controlled brakeable electric drive motor
    43.
    发明授权
    Spinning turbine having speed-controlled brakeable electric drive motor 失效
    具有速度控制制动电动机的旋转涡轮机

    公开(公告)号：US3792329A

    公开(公告)日：1974-02-12

    申请号：US3792329D

    申请日：1972-01-19

    Applicant: SIEMENS AG

    Inventor： KUHNLEIN H

    IPC: H02P3/10 ,  H02P6/24 ,  H02P3/20

    CPC classification number: H02P6/24 ,  H02P3/10

    Abstract: A spinning turbine has a speed-controlled brakeable electric drive motor. The drive motor is a commutatorless DC motor, the stator field of which can be reversed for braking. After the stator field is reversed, the stator current is turned off after a given speed is reached. The spinning turbine of the invention is used for the ''''open-end'''' spinning process.

    Abstract translation: 旋转涡轮机具有速度可控制动电驱动电机。 驱动电机是无换向直流电机，其定子磁场可以反向制动。 定子磁场反转后，定子电流在达到给定速度后关闭。 本发明的旋转涡轮机用于“开放式”纺纱工艺。

    Waterborne Vessel Braking System and Method
    50.
    发明申请
    Waterborne Vessel Braking System and Method 审中-公开

    公开(公告)号：US20180222564A1

    公开(公告)日：2018-08-09

    申请号：US15428564

    申请日：2017-02-09

    Applicant: Hal Fidlow

    Inventor： Hal Fidlow

    IPC: B63H21/17 ,  B63H5/08 ,  B63H23/24 ,  H02P3/10 ,  H02P7/08

    CPC classification number: B63H21/17 ,  B63B2755/00 ,  B63H5/08 ,  B63H23/24 ,  B63H2023/245 ,  H02P3/10 ,  H02P7/08

    Abstract: A braking system for waterborne propeller driven vessel which, upon activating a brake pedal or similar actuation device causes the vessel to almost immediately stop its forward movement. The system initiates a burst of highly amplified horsepower and torque, created by a controlled pulse of electrical power released from a bank of fully charged ultracapacitors. This pulse of electrical power is sent directly to AC induction-driven motors, causing oversized propellers to immediately rotate astern, thereby generating a reverse thrust in opposition to the vessel's forward movement sufficient to stop the vessel. The horsepower and torque produced by the braking system and operation of the present invention will also cause the oversize propellers to transmit this tremendous power into the water, without cavitation, to assist in stopping vessel movement.

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