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    Static square-wave resistance tube welding system
    5.
    发明授权
    Static square-wave resistance tube welding system 失效
    静平面电阻管焊接系统

    公开(公告)号：US3636298A

    公开(公告)日：1972-01-18

    申请号：US3636298D

    申请日：1969-10-20

    Applicant: CUTLER HAMMER INC

    Inventor： RISBERG ROBERT L ,  WHEELER BLAKESLEE G

    IPC: B23K11/25 ,  B23K11/24

    CPC classification number: B23K11/256

    Abstract: A resistance welder system for welding a continuous seam throughout the length of a tube or pipe having controlled thyristors for generating a square-wave current of a desired amplitude and at constant or variable frequency. The power is generated and transmitted at high voltage low current and transformed at the welder electrodes to low voltage high current. The system includes a controlled DC link for obtaining a desired voltage and current from a constant voltage source, and a static square-wave generator consisting of an inverter with forcing to generate a square-wave AC current from the DC link output. The voltage converter for controlling the DC link is regulated by a voltage regulator to maintain an average value of AC voltage at the electrode transformer, and a fast responding minor loop current regulator to maintain constant current in the presence of transient changes in resistivity or contact resistance.

    Static shunt motor crane hoist control system with double-duty resistors
    6.
    发明授权
    Static shunt motor crane hoist control system with double-duty resistors 失效
    具有双重电阻的静态电动机起重机控制系统

    公开(公告)号：US3555384A

    公开(公告)日：1971-01-12

    申请号：US3555384D

    申请日：1968-06-17

    Applicant: CUTLER HAMMER INC

    Inventor： HALVORSON JOHN A ,  KNASINSKI MAX S ,  RISBERG ROBERT L ,  SERBIAK RICHARD P

    IPC: B66C13/23 ,  B66C13/24 ,  H02P5/06

    CPC classification number: B66C13/24 ,  B66C13/23

    Abstract: A STATIC CONTROL SYSTEM FOR THE SHUNT FIELD MOTOR OF A CRANE HOIST CONTROL HAVING A STATIC FIELD SUPPLY AND A SOLID STATE REVERSING CHOPPER SUPPLIED FROM A CONSTANT POTENTIAL BUS FOR ARMATURE CONTROL WITH A FIRST SCR CONTROLLED RESISTOR LOOP FOR 75 PERCENT SECOND QUADRANT RETARDING TORQUE AND A SECOND SCR CONTROLLED RESISTOR LOOP USABLE WITH THE FIRST ONE FOR 150 PERCENT FOURTH QUADRANT RETARDING TORQUE. BOOTSTRAP CIRCUITS MINIMIZE THE FIRING CIRCUIT POWER SUPPLY REQUIREMENTS FOR THE RESISTOR LOOPS. SOLID STATE ANTI-PLUGGING CONTROL IS INCORPORATED IN THE DIRECTION AND SPEED CONTROL CIRCUIT. LIMIT STOP BACKOUT AT REDUCED TORQUE AND SPEED IS PROVIDED FROM THE CONSTANT POTENTIAL BUS. A UNIDIRECTIONAL DIODE CIRCUIT AFFORDS AUTOMATIC FIELD ENERGIZATION FROM THE ARMATURE IN THE EVENT OF POWER FAILURE. COMMUTATING INDUCTOR ENERGY DECAYING RESISTORS ARE RELOCATED IN THE CHOPPER CIRCUIT TO PROTECT THE CHOPPER AND DIRECTIONAL SCR''S FROM INDUCED VOLTAGES DURING COMMUTATION AND TO PROTECT THE BUS FROM A SHORT CIRCUIT IF BOTH SCR''S FAIL AS ADDED FUNCTIONS. FIELD WEAKENING AND FIELD STRENGTHENING CONTROLS ARE INCORPORATED IN THE DIRECTION AND SPEED CONTROL CIRCUIT.

    Electronic inverter having precharging control affording high frequency switching at low output
    8.
    发明授权
    Electronic inverter having precharging control affording high frequency switching at low output 失效
    具有低输出高频切换的预调控制的电子逆变器

    公开(公告)号：US3609511A

    公开(公告)日：1971-09-28

    申请号：US3609511D

    申请日：1969-10-20

    Applicant: CUTLER HAMMER INC

    Inventor： RISBERG ROBERT L

    IPC: H02M7/515 ,  H02M7/48

    CPC classification number: H02M7/5155

    Abstract: A single or plural phase solid state inverter having a half bridge for each phase and each half bridge including a pair of power semiconductor controlled rectifiers for switching, inductance-capacitance circuits for commutation of the power SCR''s, a separate and electrically isolated precharging supply for each phase, and a pair of voltage level detectors of the solid state type that allow use of the commutating energy in one part of the half bridge for charging the commutating capacitor to the required voltage level in the other part of the half bridge, above which the level detector becomes operative to allow feedback of the remaining energy to the supply, thereby to afford relatively high frequency switching in the inverter at low output voltages in an efficient manner.

    Static shunt motor crane hoist control system with controlled decelerate torque control
    9.
    发明授权
    Static shunt motor crane hoist control system with controlled decelerate torque control 失效
    具有控制非线性扭矩控制的静止式电机起重机控制系统

    公开(公告)号：US3553554A

    公开(公告)日：1971-01-05

    申请号：US3553554D

    申请日：1968-06-17

    Applicant: CUTLER HAMMER INC

    Inventor： RISBERG ROBERT L

    IPC: B66C13/24 ,  H02P7/28 ,  H02P7/298 ,  H02P3/12

    CPC classification number: H02P7/298 ,  B66C13/24 ,  H02P7/2815 ,  H02P7/2985

    Abstract: A STATIC CONTROL SYSTEM FOR THE SHUNT FIELD MOTOR OF A CRANE HOIST CONTROL HAVING A STATIC FIELD SUPPLY AND A SOLID STATE REVERSING CHOPPER SUPPLIED FROM A CONSTANT POTENTIAL BUS FOR ARMATURE CONTROL WITH A FIRST SCR CONTROLLED RESISTOR LOOP FOR 75 PERCENT SECOND QUADRANT RETARDING TORQUE AND A SECOND SCR CONTROLLED RESISTOR LOOP USABLE WITH THE FIRST ONE FOR 150 PERCENT FOURTH QUADRANT RETARDING TORQUE. BOOTSTRAP CIRCUITS MINIMIZE THE FIRING CIRCUIT POWER SUPPLY REQUIREMENTS FOR THE RESISTOR LOOPS. SOLID STATE ANTI-PLUGGING CONTROL IS INCORPORATED IN THE DIRECTION AND SPEED CONTROL CIRCUIT. LIMIT STOP BACKOUT AT REDUCED TORQUE AND SPEED IS PROVIDED FROM THE CONSTANT POTENTIAL BUS. A UNIDIRECTIONAL DIODE CIRCUIT AFFORDS AUTOMATIC FIELD ENERGIZATION FROM THE ARMATURE IN THE EVENT OF THE POWER FAILURE. COMMUTATING INDUCTOR ENERGY DECAYING RESISTORS ARE RELOCATED IN THE CHOPPER CIRCUIT TO PROTECT THE CHOPPER AND DIRECTIONAL SCR''S FROM INDUCED VOLTAGES DURING COMMUNICATION AND TO PROTECT THE BUS FROM A SHORT CIRCUIT IF BOTH SCR''S FAIL AS ADDED FUNCTIONS. FIELD WEAKENING AND FIELD STRENGTHENING CONTROLS ARE INCORPORATED IN THE DIRECTION AND SPEED CONTROL CIRCUIT.

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