AMAT 0190-01428
日期：2018-10-8在现场，建议采用变频器自动测量。由于电机温升对定子电阻有影响，测量最好在启动时进行。采用电压矢量控制，电机在1Hz时即可输出150%的额定转矩。变频器的加速时间是指输出频率从零上升到工作频率的时间，也就是电机从启动、加速到设定转速的时间，它可以由下式计算：tqg=GD2ng375式中：MD为电机加速力矩Me，Me为额定转矩，MJ为负载的静态阻转矩将tqg折算到从零升到额定转速ned的时间。tqetqe=nedngtqg变频器的启动时间应设定，而且应考虑到如果计算出的tqe值过小，变频器会因过电流而启动保护电路，使设备停止工作。
减速时间是指频率由50Hz降为0Hz时所需要的时间，即电机由额定转速降至零转速所需要的时间。可由下式计算：tzg=GD2ng375式中：Mz为电机制动力矩，Me将tzg折算为从额定转速ned降至零需要的时间tzetze=nedngtzg变频器的制动时间设定应比tze长，否则易出现直流制动过压保护。在配料生产过程中，还应考虑加减速时间、配料精度对变速给料设备的要求，在上式计算的时间范围内现场调节，确保既缩短配料时间，又不影响配料精度。
变频器在实际应用中，要考虑与电动机要求的转速变化范围相匹配的问题，特别在超速和低速运行时应十分关注。为加快生产节奏，要求电机在超过额定转速条件下运行。通用电机的超速性为120%，额定转速2分钟，因此变频器驱动通用电机的最大允许频率为62Hz，超过额定转速，电机会出现以下问题：转子及附属部件强度下降；铁损及机械损耗增加，电机温度升高；噪声及振动增大。对于两极电机，在工频下，转速已较高，不宜超过50Hz运行。
漳州鼎晟达自动化设备有限公司是一家多年专业从事大型进口系统（集散式控制系统、可编程控制器、冗余容错控制系统、机器人系统）备件销售。长年与欧美，北美等全球知名工业厂商建立起稳定的合作关系，产品直接国外进口，省掉中间环节，为广大企业用户节约开支！目前公司业务遍布全国各省市，经过多年的服务，总结出专为系统用户服务的成熟模式，实现服务的人性化、流程的简单化以及管理的规范化，有效帮助客户延长电气设备的使用周期，降低运营成本，控制停产风险、提高生产效率！主营国际知名品牌工控系统备件：AB SLC500,PL5，ABB机器人，GE，FOXBORO I/A，TIRCONEX，瑞恩，西屋OVATITONT，西门子,MOORE，MODICON,KUKA机器人，安川机器人，贝利，贝加莱，博世传动，HONEYWELL。
长期以来，公司坚守“重视合同 , 确保质量 : 准时交付 , 严守承诺” 经营理念；以极大的热情致力于创造和实现富有效力的企业管理模式；运用先进的计算机管理系统，建有完善的信息化管理平台，为采购、管理、销售、服务等各个业务环节的信息化服务，大大增强了企业核心竞争力。
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