新型电梯轿厢绝对位置检测传感器的研究

Research on New Type Elevator Car Absolute Position Detection Sensor

针对目前电梯轿厢位置检测时,增量式编码器存在位置零点偏移,大多绝对式编码器又受到量程限制等缺点,提出了基于低功耗单片机的多圈数字式绝对位置传感器。设计了多圈绝对位置传感器的硬件结构,介绍了单圈磁绝对式旋转编码器角度信号采集及多圈计数原理;设计了单片机接口电路,串行通信接口电路,电源与停电检测电路,多圈计数以及停电唤醒电路等硬件电路;设计了传感器系统的主要智能化软件;采用低功耗待机技术,设计了外部电源停电情况下依靠内部电池供电机制。实际应用结果表明该系统不仅具有精度高、功耗低等特点,且具有多圈宽量程位置检测和停电位置记忆功能。该系统能够对电梯轿厢绝对位置实现高精度实时检测。

Aiming at the elevator car position detection,the incremental encoder exists position zero offset and the most absolute encoder is limited by range and other defects. A digital multi-turn absolute position sensor based on low-power single-chip microcontroller was proposed,and the hardware structure of the multi-turn absolute position sensor was designed. The principle of magnetic single-turn absolute rotary encoder angle signal acquisition and multi-turn counting was introduced. The encoder and microcontroller interface circuit,serial communication interface circuit,power supply and power failure detection circuit,multi-turn count and power outage wake-up circuit and other hardware circuits were designed. The main intelligent sensor system software was designed,and the low-power consumption standby technology was adopted to design working mechanism exclusively on internal battery power when the external power supply was failed. Practical application results indicate that the system possesses the characteristics such as high precision,low power consumption,and has the function of multi-turn wide-range position detection and power outage position memory.The system is able to achieve the absolute position of the elevator car with high precision real-time detection.