6results about How to "Avoid skin effect" patented technology

The invention discloses a micro motor capable of preventing electromagnetic interference, and relates to the technical field of micro motors, the micro motor comprises a motor body, a slip ring installed in the motor body, carbon brush boxes symmetrically installed on the inner wall of the motor body, carbon brushes arranged in the carbon brush boxes, and micro infrared thermal imaging elements fixedly installed on the tops of the carbon brush boxes. A carbon brush box is arranged in the sliding shaft body, a rotating sleeve is arranged in the carbon brush box, a sliding piece is arranged in the rotating sleeve, the carbon brush is arranged on the sliding piece in a sleeving manner, and a constant-force spring is arranged between the sliding piece and the inner wall of the rotating sleeve. The carbon brush is in contact with the surface of the slip ring all the time during abrasion through the constant-force spring, the contact area of the carbon brush and the slip ring can be effectively monitored through the infrared thermal imaging element, and the magnetic end can be controlled through the electromagnetic mechanism in the high-conductivity metal shell to drive the extension shaft body to conduct position adjustment; and the condition that the distance between the carbon brush and the slip ring is too short or too long is avoided.

The invention relates to the technical field of cable production, in particular to a multi-strand stranded multi-core cable, which comprises a main core and auxiliary cores wound outside the main core, a filling layer is filled between the main core and the auxiliary cores, the main core is provided with one and serves as a central strand, six auxiliary cores are stranded outside the main core, insulating layers are wound outside the auxiliary cores, and the insulating layers are wound outside the auxiliary cores. According to the multi-core cable, the multi-core cable is adopted, the skin effect of the cable is avoided, the power consumption of the cable is reduced, meanwhile, the cable core filling paste is filled in and out of the combined cable core, the cable core filling paste is filled in and out of the combined cable core, and the cable core filling paste is not prone to falling off, so that the service life of the cable is prolonged. Therefore, the cavity at the contact part of the main core and the auxiliary core is filled, the internal gap of the combined cable core is effectively reduced, and the structural strength and the filling density of the combined cable core are ensured; the invention further provides a manufacturing process of the multi-strand stranded multi-core cable suitable for the multi-strand stranded multi-core cable.

The utility model discloses a magnetic switch structure which comprises an iron core and at least two sections of windings, the at least two sections of windings are arranged on the iron core, each section of winding is made of wide thin copper foil, the winding directions of the at least two sections of windings are the same, and the at least two sections of windings are connected in series. And the first end of the first section of winding and the second end of the last section of winding in the at least two sections of windings are respectively connected with an external circuit. According to the scheme, the wide thin copper foil is adopted to manufacture the winding, the at least two sections of windings are arranged on the iron core to realize the magnetic switch, the thin copper foil can overcome the skin effect and improve the conduction capability, and the problem that the magnetic switch is difficult to realize large current due to winding of a single-strand or multi-strand enameled wire is solved.

Disclosed are an electromagnetic induction heating coil and a method for manufacturing the same, the heating coil including a conductive portion that generates a magnetic field when a current passes through the conductive portion, and a cladding portion that closely winds the conductive portion from an outer periphery and defines a cross-sectional shape thereof perpendicular to a current direction, the conductive part comprises a plurality of strands of conductive wires, and is characterized in that the conductive part is limited in a space with a rectangular cross section by the coating part, the conductive wires are wires with polygonal cross sections, and the conductive wires meet the condition that C: S is greater than 45mm <-1 >. According to the heating coil, the electrified sectional area can be effectively utilized, meanwhile, the influence of the skin effect is smaller, the safe current-carrying capacity of a coil conductive wire can be effectively increased, coil heating during working of an electromagnetic induction appliance is effectively improved, and the heating coil is smaller in relative size, thinner in thickness and easier to produce and wind.

The utility model discloses a Hilbert fractal medium-short wave antenna, which belongs to the field of antennas and comprises a radiation part, an earth screen part and a feed part. The radiation part comprises a metal supporting rod, a Hilbert fractal structure and a wave trap, an original surface current distribution path is cut off, a cascade inductor is introduced, and the high-frequency skin effect is inhibited. The earth screen system is of a double-layer structure, a middle earth screen intercepts space waves, and a bottom earth screen is connected with ferrite magnetic beads in series to absorb common-mode noise. A balun and a pi-T mixed matching network are arranged in the feed system, and the standing-wave ratio is smaller than or equal to 1.5. The working bandwidth of the antenna is 526.5 KHz-28 MHz, the interference suppression depth is-35 dB, and the antenna is suitable for portable emergency communication and fixed monitoring stations.

The utility model relates to a kind of high-voltage cable and high-voltage cable system, and the high-voltage cable includes center layer and conductor layer. Among them, the center layer is formed by twisting multiple insulated filaments;Conductor layer, coated center layer, conductor layer includes multiple composite conductor layers sequentially arranged along the first direction, composite conductor layer is formed by twisting multiple insulated filaments, or multiple bare conductors are twisted to form, or insulated filaments and bare conductors are twisted to form according to preset proportion. The above-mentioned high-voltage cable, the center layer uses insulated filament, the conductor layer uses insulated filament or bare conductor or the combination structure of both, suppresses skin effect, ensures uniform distribution of current, improves cable conductor carrying capacity;At the same time, it greatly reduces the amount of enameled conductor, has small size, low loss, high reliability.