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Linear motor sliding bridge braking system - is controlled by sensor detecting gap closure speed from progressively spaced markers on bridge
Linear motor sliding bridge braking system - is controlled by sensor detecting gap closure speed from progressively spaced markers on bridge
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机译:直线电机滑桥制动系统-由传感器控制,该传感器从桥上逐渐间隔的标记中检测间隙闭合速度
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摘要
The appts. uses a series of markers, near the ends of the bridge, disposed in a horizontal line and separated by decreasing intervals towards the ends of the bridge. A fixed detector senses the passage of the markers to provide an instantaneous indication of the speed of the gate during the end of its opening or closing cycle. The detector commands the braking of the bridge, by inverting the polarity of the supply to the linear motor, as a function of the measured speed. This permits the time taken for the bridge to travel the distance separating two consecutive markers to remain essentially constant. The detector is such that it commands the braking when the time taken between two consecutive markers is below a threshold, but ceases to command the braking when an upper threshold is reached.
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