IC697ALG440

IC697ALG440

IC697ALG440

变频器选用希望森兰科技股份有限公司生产的SB70G280高性能系列矢量控制变频器，变频器主要特点是：集成高精度转子磁场定向矢量控制算法，具有250%瞬时转矩控制能力，实现转矩的快速响应和准确控制，能以很高的精度进行宽范围的调速运行；独创的多模式PLC运行功能，特别适合工业制造设备等应用；实用的多段速功能：提供编码、直接、叠加和个数选择方式；强大的PID功能等；具备强大的编程功能，用户可自定义内部I/O模块；转差补偿，AVR自动稳压功能。模拟量输入可设置为±10V，当模拟量输入信号由正变到负时，电机运转方向也随之改变，反之亦然。在自整角机上设置相应的参数，使操纵杆从中心零位开始往前输出正信号，往后输出负信号，这会给使用上带来方便。

提升机变频调速方案方框图如图2所示：

图2：矿井提升机变频调速方案

三、方案实施

斜井提升负载特性是摩擦性位能负载，属恒转矩特性负载。提升机带五个斗，装满物料沿斜面起动上行时，电机的转矩要克服负载阻转力矩和摩擦力，逐渐加速到全速运行，快到井口时，要逐渐减速。为提高效率，上行加速段和减速段的时间要尽量短，上行加速的时间可适当加大矢量控制变频器的容量来保证，由于负载重惯性大，当要求减速时间短时，上行的减速过程中有再生能量产生，会使变频器直流侧电压升高而“过压”，为此，需要用能耗制动单元加制动电阻或回馈单元处理再生能量；在下放过程中，提升机带的已经是空斗了，但在快速下放的过程仍有再生能量产生，也需要处理再生能量。

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