Method and system for constructing simulation model for electromagnetic interference prediction
A simulation model, electromagnetic interference technology, applied in the direction of electrical digital data processing, special data processing applications, instruments, etc., can solve problems such as poor prediction accuracy and difficult convergence of modeling
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Embodiment 1
[0105] A fast modeling method for common mode characteristics of motors such as figure 1 shown, including:
[0106] Obtaining a characteristic curve of the static common mode port network scattering parameter of the motor based on the bandwidth of the test system and converting the characteristic curve of the scattering parameter of the static common mode port network of the motor into a characteristic curve of the port impedance parameter;
[0107] Carry out rational formula fitting to the functional relationship corresponding to the characteristic curve of the port impedance parameter based on the vector fitting method, obtain the vector fitting function;
[0108] The vector fitting function is equivalent to a plurality of sub-circuits according to the set rules, and the circuit obtained by connecting the sub-circuits is a simulation model for electromagnetic interference prediction;
[0109] The scattering parameters of the common mode port network include: amplitude and p...
Embodiment 2
[0170] combine figure 2 , the verification object is a permanent magnet synchronous motor with a rated power of 140kW, a rated voltage of 600Vdc and a maximum torque of 2500Nm. From figure 2 It can be seen in the figure that the port of the vector network analyzer is connected to the three-phase terminal of the motor through a parallel short wire and a coaxial line. Due to the limitation of the number of sampling points of the vector network analyzer (up to 1600 points), this in-band sampling adopts the segmented sampling method, that is, 1600 points to ensure data continuity.
[0171] The amplitude and phase frequency-domain characteristic curves of the common-mode scattering parameters obtained from the test are shown in Fig. 5(a) and (b), respectively.
[0172] Through step 2, the scattering parameters of the common mode port are converted into impedance parameters, and the converted impedance parameter amplitude and phase frequency domain characteristic curves are sho...
Embodiment 3
[0178] Based on the same idea, the present invention also provides a simulation system for electromagnetic interference prediction, including: a conversion module, a fitting module and an equivalent module;
[0179] The conversion module: obtain the characteristic curve of the scattering parameter of the static common-mode port network of the motor based on the bandwidth of the test system and convert the characteristic curve of the scattering parameter of the static common-mode port network of the motor into a characteristic curve of the port impedance parameter;
[0180] The fitting module: for performing rational fitting on the functional relationship corresponding to the characteristic curve of the port impedance parameter based on a vector fitting method to obtain a vector fitting function;
[0181] The equivalent module: used to equivalent the vector fitting function into a plurality of sub-circuits according to the set rules, and connect the sub-circuits to obtain a corr...
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