中科微点-全球专利检索

  1. Login
  2. Sign Up

Search Results

10 records (took 0.011 seconds)

    Field weakening circuit for a series field motor
    7.
    发明授权
    Field weakening circuit for a series field motor 失效
    一种系列现场电机的励磁励磁电路

    公开(公告)号：US3656038A

    公开(公告)日：1972-04-11

    申请号：US3656038D

    申请日：1970-12-04

    Applicant: SQUARE D CO

    Inventor： RIES ROBERT G ,  MONTROSS ROBERT C

    IPC: H02P7/298 ,  H02P5/16

    CPC classification number: H02P7/298

    Abstract: In a control system for a direct current series motor, the contacts of a single throw reed relay are responsive to motor current through a winding in a motor supply conductor to selectively control the application of a motor field weakening shunt resistor by a switching circuit. The charging of a timing capacitor delays action of the switching circuit to prevent motor ''''hunting''''. The opening of the reed relay contacts under low motor load conditions permits charging of the capacitor and activating of the switching circuit to place the shunt resistor across the motor field for high speed operation. Under increased motor load, the reed relay contacts close and the capacitor discharges to time the removal of the shunt resistor from across the field. A by-pass transistor by-passes the reed relay contacts preventing activation of the switching circuit until the motor has reached its maximum unweakened field speed and the relay is provided with shunt windings to prevent ''''chattering'''' due to wavering motor current.

    Abstract translation: 在用于直流串联电动机的控制系统中，单掷干簧继电器的触点响应于通过电动机供电导体中的绕组的电动机电流，以选择性地控制通过开关电路施加电动机弱磁分流电阻器。 定时电容器的充电延迟了开关电路的动作，以防止电机“狩猎”。 在低电机负载条件下，簧片继电器触点的打开允许电容器的充电和开关电路的启动，以使分流电阻跨过电机磁场进行高速运行。 在增加电机负载的情况下，簧片继电器触点闭合，电容器放电，以便分流电阻从场外移除。 旁路晶体管旁路干簧继电器触点，防止开关电路的激活，直到电机达到最大未衰减的励磁速度，并且继电器提供有分流绕组，以防止由于电动机电流波动引起的“颤动”。

Patent Agency Ranking