Triac drive for three-phase line-powered linear induction motor elevator
door operator
    4.
    发明授权
    Triac drive for three-phase line-powered linear induction motor elevator door operator 失效
    Triac驱动三相线路动力线性感应电动机电梯门操作员

    公开(公告)号:US5808246A

    公开(公告)日:1998-09-15

    申请号:US533596

    申请日:1995-09-25

    IPC分类号: B66B13/14 H02K3/28 H02K41/025

    摘要: An electronic motor drive produces a required motion profile for an elevator door operator actuated by a three-phase, line-powered linear induction motor (LIM) by means of an array of TRIAC switches producing selected forces from the LIM. The TRIAC drive is capable of producing acceleration, deceleration or free coast in either the open or close direction of door operation. When controlled by an algorithm such as a "time-optimal switch point" or "bang-bang" control, the TRIAC drive produces the required motions from the linear induction motor for elevator door operation. The motor windings may be switchable between delta and wye hookups to provide two distinct thrust levels. Phase angle modulation may be used to provide finer control of thrust. The linear motor may be a 12-slot arrangement having four poles and three phases and arranged with flux emanating from the stationary primary (on the car) to a stationary backiron part of the secondary also mounted on the car, wherein the flux passes through a movable copper part of the secondary attached to the elevator door and passing between the primary and the backiron.

    摘要翻译: 电动马达驱动器通过产生来自LIM的选定力的TRIAC开关的阵列产生由三相线路供电的线性感应电动机(LIM)致动的电梯门操作员的所需运动曲线。 TRIAC驱动器能够在门操作的打开或关闭方向产生加速,减速或自由滑行。 当由诸如“时间最优切换点”或“爆炸”控制的算法控制时,TRIAC驱动器从用于电梯门操作的线性感应电动机产生所需的运动。 电动机绕组可以在三角形和二极管接头之间切换,以提供两个不同的推力水平。 相角调制可用于提供更精细的推力控制。 线性电动机可以是具有四个极点和三相的12槽配置,并且布置有从固定的主要(在汽车上)流到也安装在汽车上的次级的固定的后壁部分的焊剂,其中焊剂通过 辅助电梯的可移动铜部分连接到电梯门并通过主电梯和后铁。

    Maintaining open loop current drive to linear induction motor
    9.
    发明授权
    Maintaining open loop current drive to linear induction motor 失效
    维持开环电流驱动到线性感应电机

    公开(公告)号:US5503248A

    公开(公告)日:1996-04-02

    申请号:US223885

    申请日:1994-04-06

    摘要: An elevator car door is moved by a variable voltage, variable frequency linear induction motor which is driven open current loop to achieve a desired velocity profile indicated by an incremental linear encoder, with washed out proportional and integral gain. A magnetizing current insufficient to overcome the weight of the door is added in quadrature with the linear force current, and frequency is determined open loop in a predetermined fashion. Pulse width modulation voltage control signals are utilized to apply fixed voltages of correct polarity through a low pass three phase filter to the windings of the motor for correct intervals of time so as to synthesize desired sinusoidal winding currents. A boost of current is provided following each zero crossing of the sinusoidal winding currents to overcome lags therein. A ramp down of voltage avoids dropping the door at the end of door opening and door closing.

    摘要翻译: 电梯轿厢门由可变电压的可变频率线性感应电动机驱动,其被驱动开路电流回路以实现由增量线性编码器指示的期望速度分布,具有冲洗的比例积分增益。 不足以克服门的重量的磁化电流以线性力电流加正交,频率以预定方式确定为开环。 脉冲宽度调制电压控制信号用于通过低通三相滤波器将正确极性的固定电压施加到电动机的绕组上以获得正确的时间间隔,以便合成期望的正弦绕组电流。 在正弦绕组电流的每个过零点之后提供电流升高以克服其中的滞后。 电压下降避免了门打开和关门时的门落下。