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产品名称:
西门子模块223-1PH22-OXA8产品规格:全新原装
产品质量:质保保证
产品价格:价格优势
产品货期:现货销售
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西门子SIMOTICS N-compact 非标准电机产品信息:
适用于 1PQ8 系列电机的单独驱动的风扇的技术数据 |
||||
---|---|---|---|---|
机座号 |
P额定,50 Hz kW |
P额定,60 Hz kW |
I额定,400 V,50 Hz |
I额定,460 V,50 Hz |
315 |
0.75 |
1.23 |
3.4 |
3.3 |
355, 400 |
1.3 |
2.2 |
6.4 |
6.2 |
450 |
3.0 |
4.2 |
8.2 |
7.7 |
通常,对于变频器供电操作,噪声级高于产品目录中指定的噪声级(1PQ8 系列除外)。噪声增加取决于变频器类型,根据电机的机座号和极数,噪声增加范围位于 5 和 10 dB(A) 之间。
机械应力和润滑脂寿命
当电机的运转转速高于额定转速时,运转的平稳性会受到影响,轴承要承受较高机械应力。这会缩短润滑脂和轴承的使用寿命。我们会根据用户要求提供详细信息。
轴承
为了防止发生因轴承电流所导致的损坏,在用于变频器供电操作的 1LA8、1LL8 和 1PQ8 系列电机的非驱动端 (NDE) 使用绝缘轴承(这可以通过订货号的第 9 位 =“P”来识别)。
在通过一个变频器来运行多相感应电机时,根据所使用的原理,会通过轴承润滑膜由容性诱导电压产生一个电气负荷压力。其物理原因是变频器输出处存在共模电压,该电压在采用变频器控制的运行中是固有的:与直接的电源供电操作相比,三相电压的总和始终不等于零。高频率脉冲整形共模电压产生剩余电流,剩余电流会通过机器的内部电容、机器外壳和接地电路返回变流器的直流回路。电机的内部电容包括主绝缘绕组电容、转子和定子之间的几何电容、润滑膜电容以及任何可能存在的轴承绝缘层电容。内部电容产生的电流电平与梯度成正比,即,直流电压的电压变化 (i(t) = C ⋅ du/dt)。
为了尽可能地以正弦波的形式将电流供应给电机(平稳运转、振荡转矩、杂散损耗),变频器的输出电压需要一个高时钟频率。变频器输出电压(因而共模电压)的相关(较陡的)切换边沿可在电机的内容电容上引起相应很高的容性电流和电压。
在最坏的情况下,加在轴承两端的容性电压可能导致通过轴承的润滑膜发生的随机电弧放电,使轴承提前老化或损坏。(由润滑膜中的电弧放电而产生的电流脉冲在技术文献中被称作 EDM(静电放电加工)电流)
这种在孤立情况下发生的物理作用大多在较大型电机上才会被发现。
驱动系统的电磁兼容性安装是防止因轴承电流而产生的提前轴承损坏的基本先决条件。
降低轴承电流的最重要措施:
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6ES74162XN050AB0 CPU 416-2DP: 5.6MB(2.8MB代码,2.8MB数据),位处理速度30ns,集成接口:1. MPI/DP, 2. PROFIBUS DP
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