35results about How to "Suppression of eddy current loss" patented technology

An end plate (16) is made of a magnetic material, and holds an axis-direction end surface of a rotor core (14) in which a permanent magnet (20) is buried. The end plate includes: a protruded portion (44) constructed so as to be caused to pressingly contact the axis-direction end surface of the rotor core (14) when mounted in the rotor (10); and a depressed portion (46) constructed so as not to contact the axis-direction end surface (17). The protruded portion (44) is formed so as to contact only one of a d-axis magnetic path region and a q-axis magnetic path region that are formed by the permanent magnet (20) within the rotor core (14).

A magnetic powder according to the present invention comprises powder made of the iron element as a main component, and an insulator covering the surface of the powder. The powder has a spherical shape or a smoothed surface. The insulator comprises rare earth fluorides, alkaline metal fluorides, or alkaline earth metal fluorides. A soft magnetic composite formed by using this magnetic powder can suppress its eddy current loss in a wide frequency band and can also suppress its hysteresis loss due to compressed residual distortion in soft magnetic powder.

The invention discloses an aluminium alloy armored parallel assignment intelligent composite power cable which comprises three power cables in triangle cross section mutual parallel assignment. A temperature-sensitive fiber cable is provided at a center of geometry space formed by the assignment of the three cables and is parallel with the power cables. An aluminium alloy armored protecting pipe is sleeved on an external part of the three power cables in a sealing way and is in a bellows shape. The invention also discloses a manufacture method of the above aluminium alloy armored parallel assignment intelligent composite power cable, and the method is simple and easy in enforcement. The intelligent composite power cable can monitor work temperature of the cable in real time and in an intelligent way. The cable can be buried into surface soil with waterproof, ant prevention, mouse prevention and corrosion resistance. Eddy current loss is inhibited, surrounding electric field intensity is reduced, electromagnetic radiation and electrochemical corrosion are reduced, and a safety operation electrical condition of power transmission is satisfied. The cable has a wide application scope.

The invention relates to an artificial conductor with broadband and low eddy current loss, which belongs to the technical field of radio frequency devices and integrated circuits. The artificial conductor is a metal thin film layer / (ferromagnetic thin film layer / metal thin film layer) formed by alternate lamination of metal thin film layers and ferromagnetic thin film layers n The periodic multilayer film structure, wherein, the material of the 1st~n / 2 ferromagnetic thin film layer is ferromagnetic material A, and the material of (n / 2+1)~n ferromagnetic thin film layer is ferromagnetic material b. The invention adopts two different ferromagnetic materials as the ferromagnetic thin film layer to form an asymmetric structure, so that the artificial conductor can suppress eddy current loss in a wider frequency band. The artificial conductor of the present invention considers suppressing the eddy current loss at a lower frequency, and can also have an eddy current suppression effect in a wider frequency range, which solves the problem of narrow suppression frequency band under low frequency compensation, and has great advantages in radio frequency devices and integrated circuits. Great application prospects.

The invention relates to a three-dimensional porous flower-like structure cobalt / carbon nano-composite electromagnetic wave absorbing material. Carbon in the electromagnetic wave absorbing material forms a three-dimensional skeleton in a flower-like structure, and carbon coated cobalt particles are uniformly distributed on a carbon matrix. The preparation method comprises the following steps: 1) serving divalent inorganic cobalt salt as a precursor of cobalt hydroxide, and dissolving the divalent inorganic cobalt salt and surfactant into a solvent according to a certain mass ratio; carrying out reaction under an enclosed condition, and after reaction, carrying out washing and drying on the product to obtain the cobalt hydroxide; carrying out calcination treatment on the prepared cobalt hydroxide to obtain cobaltosic oxide powders; and 2) mixing the cobaltosic oxide powders obtained in the step 1) with a carbon source, and carrying out reaction under an enclosed condition to obtain thethree-dimensional porous flower-like structure cobalt / carbon nano-composite electromagnetic wave absorbing material. The prepared electromagnetic wave absorbing material is high in saturation magnetization, high in coercive force, light in weigh and high in oxidation resistance and has an excellent electromagnetic wave absorption performance.

The present invention provides a stator of a rotating electrical machine capable of suppressing coil eddy current loss and securing a cross-sectional area of ​​a bridge portion. A stator (10) of a rotating electric machine constitutes a coil (50) by combining slot coils (25) and connecting coils (40) which are in contact with each other. A slit (27d) is formed in a portion of the slot coil (25) located in the slot (21), and the slit (27d) penetrates the slot coil (25) and extends from one end side toward the other end side in the axial direction.

The invention discloses a non-contact electric energy transmission system for a vertical drilling system. The non-contact electric energy transmission system comprises a transformer, a series resonant inverter circuit, a rectification output circuit and an inverter control circuit, wherein the transformer is a separate transformer which comprises primary magnetic cores and secondary magnetic cores which are separated from one another; a plurality of grooves which are formed along the axis are formed in the outer circular surface of a power main shaft of the drilling system and in the inner circular surface of a hole straightening loop respectively; the primary magnetic cores are arranged in the grooves of the power main shaft; the secondary magnetic cores are arranged in the grooves of the hole straightening loop; the central angle theta formed by the circular arcs on the surfaces of the secondary magnetic cores opposite to the axis of the power main shaft meets a certain relationship, so that the magnetic resistance between the primary magnetic cores and the secondary magnetic cores is constant and is not affected by rotary motion; the phase difference between the voltage and the current is calculated by detecting an output voltage signal and an output current signal of the inverter circuit; the system is kept to work in a resonant state by adjusting the switching frequency, so that the hardware circuit is simplified and the flexibility for phase detection is improved.