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    Fast rise electric trigger pulse circuit
    2.
    发明授权
    Fast rise electric trigger pulse circuit 失效

    公开(公告)号：US3593040A

    公开(公告)日：1971-07-13

    申请号：US3593040D

    申请日：1969-11-25

    Applicant: GEN MOTORS CORP

    Inventor： GRAHAM DONALD E

    IPC: H03K17/725 ,  H03K17/00 ,  H03K3/26

    CPC classification number: H03K17/725

    Abstract: A fast rise electric trigger pulse circuit for producing a fast rise electric pulse for triggering a silicon controlled rectifier into an electrical load. The gate and cathode electrodes of the silicon controlled rectifier are connected to the positive polarity terminal of a source of direct current potential through separate, parallel resistors and the cathode electrode is also connected to the negative polarity terminal of the source of direct current potential through the collector-emitter electrodes of a normally not-conducting transistor. An externally generated electrical signal triggers a monostable multivibrator circuit to the alternate state which produces an electrical control signal of a substantially constant magnitude for a predetermined duration. The control signal is applied across the base-emitter electrodes of the transistor through a coupling circuit which reduces the magnitude of the control signal across the baseemitter electrodes over a predetermined time interval in the polarity relationship which will initiate collector-emitter current flow through the transistor to connect the gate-cathode electrodes of the silicon control rectifier across the source of direct current potential.

    System for operating two or more alternating current induction motors in parallel
    3.
    发明授权
    System for operating two or more alternating current induction motors in parallel 失效
    用于同时操作两个或更多替代电流电感电机的系统

    公开(公告)号：US3555379A

    公开(公告)日：1971-01-12

    申请号：US3555379D

    申请日：1968-05-22

    Applicant: GEN MOTORS CORP

    Inventor： GRAHAM DONALD E ,  LELAND ROBERT W

    IPC: H02P5/74 ,  H02P1/54

    CPC classification number: H02P5/74

    Abstract: A SYSTEM FOR AUTOMATICALLY CONNECTING A SECOND ALTERNATING CURRENT INDUCTION MOTOR IN PARALLEL WITH A FIRST OPERATING ALTERNATING CURRENT INDUCTION MOTOR ACROSS A COMPATIBLE ALTERNATING CURRENT SUPPLY POTENTIAL IN RESPONSE TO AN EXTERNAL DEMAND. THE PARALLEL COMBINATION OF A PHASE WINDING OF BOTH MOTORS IS CONNECTED IN SERIES WITH A NETWORK OF TWO SERIES CONNECTED, OPPOSITELY POLED SILICON CONTROLLED RECTIFIERS CONNECTED IN PARALLEL WITH TWO SERIES CONNECTED, OPPOSITELY POLED DIODES ELECTRICALLY CONNECTED AT THE JUNCTION. ELECTRICAL TRIGGER SIGNALS, PRODUCED BY A SPEED CONTROL CIRCUIT, ARE APPLIED ACROSS THE GATE-CATHODE ELECTRODES OF BOTH SILICON CONTROLLED RECTIFIERS OF EACH NETWORK DURING EACH POTENTIAL HALF CYCLE. A SWITCHING CIRCUIT, RESPONSIVE TO OPERATING MOTOR LOAD, ENERGIZES A RELAY WHICH COMPLETES AN ENERGIZING CIRCUIT FOR THE STARTING CONTACTOR OF THE SECOND MOTOR AND DEENERGIZES THE RELAY TO REMOVE THE SECOND MOTOR WHEN THE DEMAND NO LONGER EXISTS.

    Cycloconverter motor system
    7.
    发明授权
    Cycloconverter motor system 失效
    循环电机系统

    公开(公告)号：US3624472A

    公开(公告)日：1971-11-30

    申请号：US3624472D

    申请日：1970-10-09

    Applicant: GEN MOTORS CORP

    Inventor： GRAHAM DONALD E

    IPC: H02M5/27 ,  H02P27/16 ,  H02P5/40 ,  H02M1/08 ,  H02M7/44

    CPC classification number: H02P27/16 ,  H02M5/271

    Abstract: A cycloconverter motor system which includes 18 controlled rectifiers and 18 diodes connected to provide six unidirectionally conductive bridge rectifier switching means for supplying a three-phase AC induction motor from a three-phase AC source. The induction motor is provided with two identical threephase windings, each of which is comprised of three identical electrically isolated windings. Each of the six windings is connected with a respective one of the six unidirectionally conductive switching means. In this manner, each phase winding is comprised of two identical windings which are energized by their respective unidirectionally conductive switching means sequentially to provide oppositely directed magnetic fields and motor operation.

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