Thank you for the great channel and content. Really appreciate it. If you can create a tutorial showing CAD import, simplification of design, creating cables and simulating radiated and conducted emissions, it would be extremely valuable for a lot of people. Especially from an experienced user like you.
I have a methodology question. It is said that the earlier emc issues are considered in the design the better. However things keep changing as the project develops. What can be done during the mechanical design phase and at the end of first proto build to make maximum use of emc design work
That's exactly the advantage of a simulation model: it can be created before the first prototype and it can be modified when changes occur. Of course at first stages some data is not yet available and needs to be guessed, still a good simulation model should already deliver reasonable estimates.
hello mr. Andreas Barchanski, may I get to know about how to set PWM for gate mosfet in CST Studio Suite? Is that import result from other software, or can set in CST directly?
Nice presentation. Do you have any video or link suggestion in where to find the desig guidelines or rule-of-thumb to Pi-Filter and Cy caps ? Thank you.
How was the noise separated into common mode and differential mode in the simulation? Do we apply a math operation Vp-Vn = diff noise and Vp+Vn = CM noise?
I'm sorry Mr.@@AndreasBarchanski, i use "Transient Task" but the result is a "time-domain" result. Could u help me to learn how to show the "frequency-domain" result like your video? thanks, sir.
hi, thanks for sharing about EMC for inverter. i have question about inverter circuit, how to import spice model for mosfet? i have tried but get error.
SPICE language has many dialects and keywords specific to a dialect. Sometime files are also encrypted, so it depends on the particular error to understand what is the problem.
Hi thank you for this. Something for a discussion: sometimes there is also a filter after inverter bridge for filtering noise from the motor, so you probably do not have noise created by the motor?
No, I don't think that there is noise created by the motor. The motor is not an active element. However, the noise from the inverter will also propagate through the motor cables and the motor itself, so the filter between inverter and motor is suppressing noise propagation on the motor side.
@@AndreasBarchanski i think that depends of the type of the motor and interactions on its Internal components also you can have resolver in the motor housing that could be additional source and sink of the nosie.
Great video, Thank you. Why use a filter in the first place? Do we really care about the conducted RF currents flowing back to the battery? At RF frequencies the battery is an array of capacitors and the length of the cables are inductors. Okay, so there are high RF currents in this cable. Put these currents in a suitably designed transmission line. Can your software be used to design a transmission line cable with appropriate DC and AC capabilities that would constrain these currents without creating harmful radio interference?
Hi Joanna, I have seen your posts regarding this topic on LinkedIn. Of course you can use our software to design proper transmission lines to suppress the differential mode. But thats only half of the problem: Just the stator of an EV has typically around 20 nF capacitance to the housing (that is connected to the chassis). Thus, you will always have a significant common mode emission that can not be supressed by improving the desing of the DC cables. You still need filtering/shielding.
@@AndreasBarchanski Yes, the common mode capacitance of the motor is a big issue, but so are the leaky cables and there are other issues that will need to be addressed to keep EVs from polluting the AM band. To address the common mode issue; As I'm sure you are aware, balance in a differential system is critical in preventing differential to common mode conversion. The 3 phase 3 wire wye motor control is not balanced. To be specific the number of on high rail transistors is not always equal to the number of on low rail transistors. Hence the shunt capacitance to chassis of the rails is changing from 40nF/20nF to 20nF/40nF. And with this change the chassis current has a nasty pulsed current on it. I have to wonder if a 3 phase 6 wire motor with a 12 transistor inverter would help. With full rail voltage accross the windings the amount of copper could be reduced. This would offset the cost of 6 more transistors. It is a question for the motor folks to answer.
