0608720040力士乐行星减速机

0608720040力士乐行星减速机

武汉百士自动化设备有限公司专注于液压、气动、工控自动化备件销售，热诚欢迎新老客户咨询购买！

是百士自动化【主营产品】之一，手机/微信号；15307130607，联系人；黄依依，在线QQ；2829871406，电话：027-87680708

直流电机具有响应快速、较大的起动转矩、从零转速至额定转速具备可提供额定转矩的性能，但直流电机的优点也正是它的缺点，因为直流电机要产生额定负载下恒定转矩的性能，则电枢磁场与转子磁场须恒维持90°，这就要藉由碳刷及整流子。碳刷及整流子在电机转动时会产生火花、碳粉因此除了会造成组件损坏之外，使用场合也受到限制。交流电机没有碳刷及整流子，免维护、坚固、应用广，但特性上若要达到相当于直流电机的性能须用复杂控制技术才能达到。现今半导体发展迅速功率组件切换频率加快许多，提升驱动电机的性能。微处理机速度亦越来越快，可实现将交流电机控制置于一旋转的两轴直交坐标系统中，适当控制交流电机在两轴电流分量，达到类似直流电机控制并有与直流电机相当的性能。

直流无刷电机是同步电机的一种，也就是说电机转子的转速受电机定子旋转磁场的速度及转子极数(p)影响。在转子极数固定情况下，改变定子旋转磁场的频率就可以改变转子的转速。直流无刷电机即是将同步电机加上电子式控制(驱动器)，控制定子旋转磁场的频率并将电机转子的转速回授至控制中心反复校正，以期达到接近直流电机特性的方式。也就是说直流无刷电机能够在额定负载范围内当负载变化时仍可以控制电机转子维持一定的转速。

要让电机转动起来，首先控制部就必须根据hall-sensor感应到的电机转子目前所在位置，然后依照定子绕线决定开启(或关闭)换流器(inverter)中功率晶体管的顺序，使电流依序流经电机线圈产生顺向(或逆向)旋转磁场，并与转子的磁铁相互作用，如此就能使电机顺时/逆时转动。当电机转子转动到hall-sensor感应出另一组信号的位置时，控制部又再开启下一组功率晶体管，如此循环电机就可以依同一方向继续转动直到控制部决定要电机转子停止则关闭功率晶体管(或只开下臂功率晶体管)；要电机转子反向则功率晶体管开启顺序相反。

当电机转动起来，控制部会再根据驱动器设定的速度及加/减速率所组成的命令与hall-sensor信号变化的速度加以比对(或由软件运算)再来决定由下一组开关导通，以及导通时间长短。速度不够则开长，速度过头则减短，此部份工作就由pwm来完成。pwm是决定电机转速快或慢的方式，如何产生这样的pwm才是要达到较精准速度控制的核心。高转速的速度控制必须考虑到系统的clock 分辨率是否足以掌握处理软件指令的时间，另外对于hall-sensor信号变化的资料存取方式也影响到处理器效能与判定正确性、实时性。至于低转速的速度控制尤其是低速起动则因为回传的hall-sensor信号变化变得更慢，怎样撷取信号方式、处理时机以及根据电机特性适当配置控制参数值就显得非常重要。或者速度回传改变以encoder变化为参考，使信号分辨率增加以期得到更佳的控制。电机能够运转顺畅而且响应良好，p.i.d.控制的恰当与否也无法忽视。之前提到直流无刷电机是闭回路控制，因此回授信号就等于是告诉控制部现在电机转速距离目标速度还差多少，这就是误差(error)。知道了误差自然就要补偿，方式有传统的工程控制如p.i.d.控制。但控制的状态及环境其实是复杂多变的，若要控制的坚固耐用则要考虑的因素恐怕不是传统的工程控制能完全掌握，所以模糊控制、专家系统及神经网络也将被纳入成为智能型p.i.d.控制的重要理论

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0608800568  REDUCTION GEAR VUL 1A 294

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0608800566  REDUCTION GEAR VUL 1B 260

0608800569  REDUCTION GEAR VUL 1B 294

0608800564  REDUCTION GEAR VUL 1C 226

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