3 results about "Two phase composite" patented technology

This invention relates to a method and system for suppressing torque ripple during inter-turn short-circuit faults in permanent magnet synchronous motors (PMSMs), belonging to the field of fault-tolerant control technology for inter-turn short-circuit faults in PMSMs. The invention aims to address the shortcomings of existing technologies in suppressing torque ripple caused by inter-turn short circuits and the lack of system strategies for two-phase composite faults. First, mathematical models of the motor under normal, single-phase, and two-phase inter-turn short-circuit fault conditions are established to analyze the generation mechanism of torque ripple. When a single-phase inter-turn short circuit occurs, a compensation current is injected into the three-phase stator current to completely cancel out the torque ripple term. When a two-phase inter-turn short circuit occurs, the compensation components caused by each phase fault are calculated based on the principle of linear superposition and then injected together to obtain the three-phase reconstructed reference current. This invention can be used for the smooth and fault-tolerant operation of PMSMs after inter-turn short-circuit faults, and is particularly suitable for applications requiring high torque stability, such as electric vehicles and servo drives.

The present application relates to the technical field of composite structure dynamics analysis, and provides a method and system for predicting the natural frequency of a three-phase functionally graded composite conical plate, which comprises the following steps: calculating the equivalent parameters of a two-phase composite substrate containing GPL by using an improved Halpin-Tsai model, solving the equivalent parameters of a three-phase composite layer, constructing the nonlinear geometric relationship between the displacement field and the strain field, calculating the stiffness coefficient of each layer, constructing the kinetic energy of the three-phase composite conical plate, calculating the energy coefficient according to the stiffness coefficient of each layer, constructing the potential energy of the conical plate according to the energy coefficient, constructing the modal displacement function by using Chebyshev polynomials and boundary functions, establishing the characteristic equation based on the principle of minimum potential energy and solving it, and obtaining the natural frequency of the three-phase composite conical plate. The present application realizes efficient calculation of the natural frequency of the three-phase composite conical plate, and significantly improves the reliability and engineering application value of structural dynamics analysis.

This invention relates to the field of anti-corrosion coating technology, and discloses a modified epoxy anti-corrosion coating resistant to high temperature and strong acid and its construction method. The coating comprises an organophosphonic acid-functionalized phenolic epoxy resin, an organosilicon-modified epoxy resin, a linear phenolic resin curing agent, and a latent curing accelerator. The latent curing accelerator is a complex of imidazole and zinc chloride. The construction method includes mixing the two-phase composite resin matrix with the curing agent and cooling it, adding the curing accelerator for high-speed shear dispersion and vacuum degassing, and pouring it into a preheated mold for segmented heating and curing. The organosilicon system containing a silicon-oxygen backbone, combined with a high-crosslinking density phenolic network, increases the resistance to penetration by acidic media and resists high-temperature pyrolysis; the organophosphonic acid groups coordinate with the metal surface, improving interfacial adhesion; and the latent control of the complex combined with segmented curing releases shrinkage stress, preventing micro-cracks in the anti-corrosion coating.