6 results about "Electromagnetic model" patented technology

This invention relates to the field of urban rail transit inspection technology, and particularly to a characteristic mode design system for broadband conformal antennas used in inspection. The system includes an inspection condition parameter input module for acquiring the condition parameters of the target inspection section, which at least include the section type, communication link requirements, and target operating frequency band; a multi-rotor UAV body modeling module for establishing a full-size three-dimensional electromagnetic model of the UAV based on its geometry and material properties; and a characteristic mode analysis module, signal-connected to the inspection condition parameter input module, for analyzing the characteristic modes based on the target operating frequency band. This invention deeply integrates inspection condition parameters into the entire process of characteristic mode selection, antenna element design, and beamforming. Based on the communication link requirements of different inspection sections, it selects matching dominant characteristic modes and implements targeted beamforming, ensuring that the antenna radiation characteristics are highly adapted to the complex inspection environment of rail transit and overcoming communication attenuation problems.

This invention discloses a rapid electromagnetic-thermal coupling optimization method for permanent magnet motors considering demagnetization. Specifically, it involves finding an initial topology for the permanent magnet motor that satisfies the temperature rise condition after electromagnetic-thermal coupling calculations, and obtaining the average temperature rise of each component of the motor. This temperature rise is then fixed in the parametric electromagnetic model of the motor, and the motor efficiency is calculated using LHS sampling and finite element method. or With the degree of demagnetization D m Furthermore, a demagnetization penalty term is introduced into the efficiency calculation. D m Mapped to a 01 array, denoted as D m_01 Using efficiency data and demagnetization data D m_01 The Kriging response surface and the decision tree response surface were trained separately. Using demagnetization as a constraint, the motor efficiency was optimized and validated using NAGA-II. If the accuracy of the efficiency response surface was insufficient, it was trained and optimized again to enhance its predictive ability in the high-efficiency region of the motor. Electromagnetic-thermal coupling calculations were performed using the highest-efficiency topology predicted by the efficiency response surface to obtain the efficiency. or re .like or re If the requirements are met, the optimization ends; if not, a new round of optimization begins, and this cycle continues.

This application provides a stator and rotor optimization design method for a permanent magnet synchronous motor, including: Step S1, establishing a parametric electromagnetic model based on the main dimensions and performance targets of the permanent magnet synchronous motor, and selecting key design variables; Step S2: conducting orthogonal experimental design on the key design variables based on the Taguchi method, and using finite element simulation to obtain the motor efficiency, average torque, and torque ripple coefficient under different parameter combinations; Step S3: refining the rotor structure based on the motor basic design established by the optimal parameter combination; Step S4: performing mechanical strength verification at the highest operating speed and thermal performance verification under rated operating conditions; Step S5: generating an efficiency characteristic spectrum of the motor within the full operating range and outputting manufacturing drawings. This application, through this method, ensures that the motor achieves a comprehensive performance of high efficiency and low vibration and noise while meeting strict dimensional constraints.

The application discloses a power transmission line abnormal discharge fault point positioning method, comprising the following steps: S1, installing a high-frequency current transformer at a key node to collect a transient current signal during abnormal discharge at a frequency not lower than 1MHz and to carry out denoising and standardization preprocessing; S2, parallelly applying wavelet transform and Fourier transform, the wavelet transform extracts local detail features of the signal in the time-frequency domain, the Fourier transform obtains global frequency spectrum features of the signal, and the two are fused into a high-dimensional composite feature vector; S3, inputting the obtained feature vector into a pre-trained BP neural network to realize intelligent mapping from the features to the fault mode; S4, adopting an electromagnetic time reversal method, intercepting a fault initial traveling wave signal, reversing on a time axis, replaying in an accurate electromagnetic model of the line, calculating and scanning a spatial distribution function of electromagnetic energy along the line, and obtaining an accurate fault point; the application has the advantages of intelligent identification, high positioning precision and strong anti-interference performance.

This invention provides a design method for a magnetic resonance double-loop resonant self-decoupling coil based on multi-objective optimization, comprising the following steps: Step 1, constructing a physical model of the magnetic resonance double-loop resonant self-decoupling coil; Step 2, establishing an electromagnetic model based on coupled-mode theory to solve for the system's characteristic modes; Step 3, determining the solution method for complex current distribution; Step 4, determining the spatial magnetic field distribution index; Step 5, constructing a multi-objective optimization function, including: a field strength gain term, aiming to maximize the central field strength; and a uniformity penalty term, calculating the difference ratio between the central field and the edge field; Step 6, setting physical constraints; and Step 7, performing nonlinear global optimization.

The application discloses a three-dimensional anti-deviation collaborative optimization design method of a wireless excitation synchronous motor system and belongs to the technical field of wireless excitation synchronous motor systems. The method comprises input system design requirements and constraint conditions; a magnetic coupling resonance wireless energy transmission link model is established to obtain the corresponding relationship of coupling coefficients and output power and efficiency; an electromagnetic model of an electrically excited synchronous motor and the coupling relationship between the electromagnetic model and rotor excitation current are established to obtain the unified mapping of coupling coefficients and motor output power and system efficiency; a three-dimensional deviation model is established and the maximum coupling coefficient change rate is calculated as an anti-deviation index; a multi-objective collaborative optimization model with output power, system efficiency and anti-deviation capacity as optimization objectives is constructed; and optimization solving is performed and magnetic coupler parameters and motor key parameters are output. The application improves coupling stability under three-dimensional deviation conditions while ensuring power and efficiency, effectively suppresses rotor excitation current and output power fluctuation, and improves system robustness.