Motor-CAD试用感受

zengxiaodong

把提供替换的文件netapi32.dll额外拷贝一份到ANSYS_Motor-CAD\15_1_2\licensingclient\winx64目录里面就可以了！

zengxiaodong

The Campbell diagram shows the magnitude spectrum at variable speed operation of the main excitation orders. Excitation frequency order lines are displayed for frequency orders going from one up to the maximum value defined from the Nyquist Shannon Theorem.

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Multiple frequency order lines are possible for a given order “n”, e.g. (m = 4, n) and (m=8, n). The Plot Selection dropdown allows to track frequency order lines considering either all wavenumbers or a particular wavenumber. By hovering the mouse cursor on an excitation order line, the space and frequency orders along with the speed and frequency data are displayed in the status line. Operating points at which force harmonics are calculated are defined in the Calculation tab. Harmonic force data are then interpolated between simulated speed points.

The dark blue regions correspond to either regions of null excitation in between two consecutive frequency order lines, or regions where the excitation is simply not calculated, as per the Nyquist-Shannon Theorem. Dashed lines represent the natural frequencies of the stator structural modes, calculated from the Modal analysis.

The Campbell Diagram represents the force excitation frequencies of the stator against various operating speeds. Each frequency/space orders colour is displayed relative to it's maximum amplitude across each load point. Dashed vertical lines represent the natural frequencies calculated from the Modal model up to the maximum plotted excitation frequency. See NVH settings for more information on the maximum plotted excitation frequency.

This plot is extremely useful to not only extract the main excitation orders but also evaluate their potential interaction with the stator structure (see Resonance Effect for more information).

zengxiaodong

zengxiaodong

万能软件Star CCM+居然是全中文的帮助文件，将近13000页之多！！！Motor-CAD在这方面大大落后了，所谓的中文界面可谓是漏洞百出，令人啼笑皆非。

zengxiaodong

zengxiaodong

老版本的结果储存在2个文件夹




而新版本的结果储存在3个文件夹




更大的变化是新版本的结果文件，大小增加了好几倍！

zengxiaodong

计算出来的结果文件，从39.6MB增加到了115MB，而且保存文件的操作费时远远超过老版本！

似乎感觉求解的时间也明显延长了，这点不太确定。


文件体积增加，主要发生在这个INI文件

zengxiaodong

软件速度确实是大幅度变慢了，显示结果的任一图表，都要很长时间，（未响应）

zengxiaodong

永磁同步发电机仿真


在这个帖子中介绍了无源发电机的仿真设置
https://bbs.simol.cn/thread-196147-1-1.html


但是，很多时候永磁同步发电机可以运行于有源模式，也就是说用可控整流器来驱动控制永磁同步发电机，此时如何仿真呢？

zengxiaodong

有源发电机的相量图如下：





可见，端电压仍然超过了直流母线电压，这是不允许的！

zengxiaodong

事实上，由于网侧必然要采用逆变器（也就是可控整流器），因此可以很轻松地升高直流母线电压，假设网侧线电压有效值690V，峰值975.8，我们将直流母线电压升高10%达到1073V，仿真结果如下





事实上，要实现网侧功率因数可控，同时电压波形完美的话，必须升高直流母线电压至少15.47%以上，这是半导体变流SPWM的工作基础。

zengxiaodong

从上述相量图可以很容易发现，发电机的功率因数不够高，这是由于直轴电流为零的缘故，为了提高功率因数，我们可以施加适当的直轴电流，也就是改变电流相位角，使得功率因数接近1.0






在大幅度提高功率因数以后，端电压也能显著降低，从而可以增加发电机线圈匝数，大幅度减少发电机的线电流！

zengxiaodong

经过上述优化调整以后，线圈匝数增加50%，发电机线电流减少到原设计的76%，而功率因数提高到-0.9816

zengxiaodong

要达到功率因数接近1.0的目的，对于反电势是有要求的，也就是反电势要足够高才会有实际意义。

zjq518866

学习了，感谢分享

cx990436422

zengxiaodong 发表于 2022-3-7 16:47
软件速度确实是大幅度变慢了，显示结果的任一图表，都要很长时间，（未响应）

新版本比以前变慢至少6倍以上

王小见

Motor cad  也还行吧

SCH123456

终于找到了发电机仿真方法，谢谢楼主

SCH123456

zengxiaodong 发表于 2022-2-18 15:28

请问下大佬，这个培训是安排在什么时候的呢？