公开(公告)号：US3755712A

公开(公告)日：1973-08-28

申请号：US3755712D

申请日：1972-09-07

Applicant: SQUARE D CO

Inventor： DE VINEY T ,  BRENNAN R

IPC: H02H7/08 ,  H02H7/14

CPC classification number: H02H7/0833

Abstract: In a regenerative DC motor control, a line voltage failure during regeneration ordinarily results in a fault current of sufficient magnitude to damage any conducting thyristors or their protective fuses. To prevent such damage, a gate suppression circuit operates upon occurrence of a fault to prevent further firing of thyristors. A fault protection module controls the connection of a charged capacitor across the then-conducting thyristors at a predetermined time after the fault to permit resetting of those thyristors and prevent any damage to thyristors or fuses.

Abstract translation: 在再生直流电动机控制中，再生期间的线路电压故障通常导致足够大的故障电流，以损坏任何导电晶闸管或其保护熔断器。 为了防止这种损坏，门禁抑制电路在发生故障时操作，以防止晶闸管的进一步烧制。 故障保护模块在故障之后的预定时间控制充电的电容器在导通晶闸管之间的连接，以允许复位这些晶闸管并防止对晶闸管或熔丝的任何损坏。

公开(公告)号：US3723825A

公开(公告)日：1973-03-27

申请号：US3723825D

申请日：1972-01-19

Applicant: SQUARE D CO

Inventor： DE VINEY T

IPC: B66C1/00 ,  B66C1/08 ,  B66C13/18 ,  H01F7/18 ,  H01F13/00

CPC classification number: H01F13/00 ,  B66C1/08 ,  B66C13/18 ,  B66C2700/087 ,  H01F7/18

Abstract: A control system for a lifting magnet measures the lift current of the magnet and causes the drop-out current to reach a predetermined percentage of the lift current at interruption so that clean drops are provided, without adjustment, regardless of the condition of the circuit elements, the temperature of the lifting magnet, or the size of the magnet.

Abstract translation: 用于提升磁体的控制系统测量磁体的提升电流，并且导致脱落电流在中断时达到提升电流的预定百分比，使得不需要调节就可以提供清洁的液滴，而不管电路元件的状况如何 ，提升磁体的温度或磁体的尺寸。