56results about How to "Small insulation resistance" patented technology

The invention provides a motor control apparatus with an insulation degradation detection device and an insulation degradation detection method of the motor. According to the apparatus, a bootstrap circuit can be applied for the insulation resistance detection function of the driver circuit of a semiconductor switch. A voltage division circuit is arranged between one end of the negative DC output part and a ground line through the normally open switch circuit comprising relay contacts. When a breaker is off, the normally open switch circuit is in a close state through a detection operation control part. The detection operation control part carries out the detection operations as following: in a pair of transistors in an arm circuit in an inverter circuit, one is in a conductive state and the other is in a stop state through PWM signals of the same duty ratio, and the insulation resistance detection part detects the insulation resistance based on the division voltage output by the voltage division circuit and the DC voltage input to the inverter circuit.

The invention relates to an electric automobile body insulation detection system and method. The electric automobile body insulation detection system comprises a power supply protection circuit, an MCU (Micro Control Unit), a power supply isolation circuit, a voltage injection circuit, an internal storage circuit, a detection voltage injection feedback circuit, a resistance measurement circuit, a CAN, an operating state indication circuit, a switching value or PWM insulation fault level indication circuit. The electric automobile body insulation detection system further retains high precision of insulation resistance measurement on the basis of reducing the injection voltage and current, and can also assess which side of positive and negative buses has lower insulation resistance for the automobile body.

The improved oil resistant semi-conductive cable shielding material consists of butadiene-acrylonitrile rubber or hydrogenated butadiene-acrylonitrile rubber 100 weight portions, conducting carbon black 50-80 weight portions, graphite powder 15-30 weight portions, plasticizer 15-20 weight portions, dithio tetramethyl thiram and alphatic polysulfide 1.0-3.0 weight portions, dibenzothiazole disulfide and zinc diethyl dithio amino formate 1.0-2.0 weight portions, zinc oxide and stearic acid 8.0-10.0 weight portions. Compared with available technology, the present invention has the advantages of excellent conductivity, volume resistivity not greater than 50 ohm.cm, high tensile strength up to 18 MPa, high oil resistance and other advantages.

The invention provides a prefab branch cable and a production method thereof. Both a backbone cable and a branch cable consist of a conductor, an insulating layer and a metal sheath, wherein, the insulating layer is wound by a mineral insulated tape, wires of both the backbone cable and the branch cable are connected in a Y shape, the mineral insulated tape is wound outside nodes and compression jointed together by a connecting piece, the outermost layer is sealed by a metal encloser and a metal cap which are fitted, both the metal enclosure and the metal cap are provided with corresponding connecting holes and are fixedly connected by a fastening piece. The high-temperature resistance, the humidity resistance and the fire resistance or the sealing effect of the prefab branch cable are further improved. The invention has the characteristics of simple end processing structure, safety and reliability, convenient assembly and disassembly, firm cable clamp, good leak tightness, high-temperature resistance, corrosion resistance, fire resistance and explosion prevention; moreover, the invention does not reduce the insulating resistance due to moisture. In the power transmission, the invention can bear greater current capacitance; in case of fire, any smoke or toxic or harmful gases is not generated and the combustion is not caused. Therefore, the invention can be applicable to various industries and civil buildings.

The invention relates to a motor shaft current eliminating structure and a motor. The motor shaft current eliminating structure comprises a rear cover plate, a graphite rod and at least one electrically conductive elastic member, the rear cover plate can be electrically connected to the housing of the motor. The graphite rod can be placed in a graphite rod mounting hole of a motor rotating shaft,and the conductive elastic member is an electrically conductive spring and / or an electrically conductive elastic piece; the graphite rod is electrically connected with the rear cover plate directly orthrough the electrically conductive elastic piece; and the graphite rod can be electrically connected with the motor rotating shaft directly or through the electrically conductive spring. The embodiment of the invention has the advantages of compact structure, simplicity and low cost. The graphite rod and the conductive elastic parts are all inside the motor, which are not affected by the external environment, and do not produce noise when running, so the conductive parts are reliable.

This invention relates to a method for testing leakage of supplying pipelines of non-conduction materials, which sets many connected electrodes in walls of pipelines of different regions of non-conducting materials buried away from ordinary metal pipelines as one pole of conduction and sets many electrodes to be connected one by one outside of the pipeline walls of different regions as the other pole, thus, ordinarily, leakage does not happen and the resistance between electrodes inside and outside of the pipe is large, the device does not alarm at the time, when leakage happens, water infiltrates into the earth and resistance of the electrodes buried in the earth reduces greatly and the device alarms because of small resistance.

Prepare a Pb(Zn1 / 3Nb2 / 3)O3-PbTiO3-PbZrO3 three-component piezoelectric ceramic composition whose basic composition formula is Pb(Zn1 / 3Nb2 / 3)aZrxTiyO3 (here, 0.90<a+x+y<1.00) s material. This material is calcined and pulverized to obtain a powder. A molded body of a predetermined shape containing the obtained powder is produced. A sintered body is obtained by degreasing the formed body at a temperature at which the formed body is not sintered, and then sintering the degreased formed body. The obtained sintered body is heated to perform heat treatment on the obtained sintered body. A piezoelectric ceramic device is obtained by polarizing the heat-treated sintered body and imparting piezoelectricity to the heat-treated sintered body. The piezoelectric ceramic composition can be simultaneously sintered at a low temperature with an electrode mainly composed of Ag, and the insulation resistance does not decrease after sintering, and the piezoelectric properties do not deteriorate. Therefore, even if the composition is used in a high-temperature and high-humidity atmosphere, the insulation resistance does not decrease, and it has stable characteristics.

Disclosed is a flame-retardant resin composition containing 60-320 parts by mass of a magnesium hydroxide (B) per 100 parts by mass of a resin component (A) which contains 50-100% by mass of an ethylene copolymer (a), 0-50% by mass of an acrylic rubber (b) and 0-30% by mass of a modified polyolefin resin (c) which is modified with an unsaturated carboxylic acid or a derivative thereof. The magnesium hydroxide (B) contains 5-320 parts by mass of a magnesium hydroxide (B-1), which has an aspect ratio of 6-25 and a BET specific surface area of 8-25 m2 / g, per 100 parts by mass of the resin component (A).

To provide a flux composition and a solder paste which can suppress decrease in the insulation resistance of flux residues without reducing in an amount of blended activator. A flux composition comprises (A) rosin-based resin, (B) solvent, (C) activator and (D) thixotropic agent, the thixotropic agent (D) comprising a thixotropic agent having (D-1) fatty acid polyamide structure, with the fatty acid having a C12-22 long-chain alkyl group.

A printed wiring board comprises a wiring substrate provided with at least one conductor circuit, a solder resist layer provided on the surface of the wiring substrate, at least one conductor pad formed from a part of the conductor circuit exposed from an opening provided in the solder resist layer, and at least one solder bump for mounting electronic parts on the conductor pad. In the printed wiring board, since the at least one conductor pad is aligned at a pitch of 200 µm or less, and a ratio (W / D) of a diameter W of the solder bump to an opening diameter D of the opening formed in the solder resist layer is within a range of 1.05 to 1.7, connection reliability and insulation reliability can be easily improved.

The invention provides a multilayered ceramic capacitor which in a high-temperature loading test, can be inhibited from decreasing in insulation resistance with time and whichcan have high insulating properties even when produced without via a reoxidationstep. The multilayered ceramic capacitor is formed by alternately superposing dielectric layers made of dielectric porcelain and inner-electrode layers. The dielectric porcelain is constituted of first crystals comprising crystal particlescomprising barium titanate as the main component and having a calcium concentration of 0.2 at.% or lower and second crystals comprising crystal particles having a calcium concentration of 0.4 at.% or higher. The ratios (C2 / C1) between theconcentrations (C1) of magnesium and rare earth elements in a surface layer of the crystal particles constituting the first crystals and the concentrations (C2)of magnesium and the rare earth elements in a central part of the crystal particles (9a) constituting the first crystals are higher than the corresponding concentration ratios (C4 / C3) in the crystal particles (9b) constituting the second crystals. When the areal proportion of the crystal particles of the first crystals and that of the crystal particles of the second crystals are expressed by a and b, respectively, then b / (a+b) is 0.5-0.8.

A dielectric porcelain composition which comprises a main component comprising barium titanate, a first auxiliary component comprising an AE oxide (wherein AE represents at least one selected from among Mg, Ca, Ba and Sr) and a second auxiliary component comprising an R oxide (wherein R represents at least one selected from among Y, Dy, Ho and Er), wherein the amounts of the first auxiliary component and the second auxiliary component relative to 100 moles of the main component are 0 mole < the first auxiliary component < 0.1 mole and 1 mole < the second auxiliary component < 7 mole, respectively. The composition exhibits an elevated relative permittivity, can retain initial insulation resistance for a long period of time, exhibits a capacity-temperature characteristic satisfying the X8R characteristic of EIA specification, and can be subjected to a firing treatment in a reducing atmosphere.

The invention is applicable for the technical field of electronics, and provides a light touch switch type key circuit, which comprises a power supply (Vcc), a resistor (R1) and a resistor (R2). The key circuit further comprises an electronic switch and a light touch switch (K1), wherein the light touch switch (K1) is connected with an input end of the electronic switch; after the resistor (R1) and the resistor (R2) are connected in series, one end of the resistor (R1) and one end of the resistor (R2) are connected with the power supply (Vcc), while the other ends are connected with an output end of the electronic switch; the light touch switch (K1) is used for controlling the on-off of the electronic switch through the on-off of the light touch switch (K1); and the electronic switch is used for outputting a control signal. Through the technical scheme in the invention, a light touch switch type key still can be normally used if insulation resistance thereof is decreased much or contact resistance is increased much, so that the working reliability of equipment is greatly improved, the degree of satisfaction of users is improved, after-sales complaints about the failure of the key are greatly reduced, and the maintenance cost is saved.

The purpose of the present invention is to effectively prevent, using a very simple structure, power leakage caused by dew condensation water or the like by increasing a creeping distance of a batterycell bottom surface. Provided is a power supply device that comprises: a plurality of battery cells (1) having a square outer shape; separators that are arranged between the battery cells (1); a pairof end plates that are disposed at the two ends of a battery multilayer body that is formed by stacking a plurality of the separators and the battery cells (1) on top of one another; and a binding bar that binds the pair of end plates to each other. The separators are provided such that insulating rib parts (21) thereof, which are disposed on bottom surfaces of the battery cells (1) stacked at both sides, are provided so as to protrude toward both surfaces, and the insulating rib parts (21) of the separators, which are stacked on both surfaces of the battery cells (1), are stacked on the bottom surfaces of the battery cells (1). An insertion rib (23), which is provided on one stacked insulating rib part (21), is inserted into an insertion groove (22), which is provided in another stackedinsulating rib part (21), the insulating rib parts (21) are stacked one top of the other, and the insulating rib parts (21), which have a curved U shape creeping distance, are disposed on the bottom surfaces of the battery cells (1).

The invention provides a printed wiring board, wherein conductor circuits and interlayered resin insulating layers are stacked alternately on the printed wiring board, and the printed wiring board has a lamination layer for electrically connecting conductor circuits located at different layers by via holes. The printed wiring board is provided by arranging a solder resist layer to cover the interlayered resin insulating layer located at the outermost of the lamination layer nad the conductor circuit located at the outermost, forming as a conductor pad a part of the conductor circuit exposed from an opening section arranged on the solder resist layer, and by forming a solder bump on the conductor pad for mounting an electronic component. The connecting reliability and the insulating reliability are improved by permitting a rate (W / D) of a solder bump diameter (W) to the opening diameter (D) of the opening section to be 1.05-1.7, even in a narrow pitch structure where the pitch of the opening section arranged on the solder resist layer is 200[mu]m or less.

This invention provides a pyroelectric ceramic composition comprising a compound represented by general formula (Pb1-xCax)(1+a){(Ni1 / 3Nb2 / 3)yTi(1-y)}O3, wherein x, y and a are 0.20 = x = 0.27, 0.01 = y = 0.06 and 0.001 = a = 0.02, respectively, as a main component and containing 0.3 to 2.5 moles of Mn based on 100 moles of the main component. A segregation product containing Ni, Ti and Mn is contained in an amount of not more than 1.0 vol% (including 0 vol%) in a fired sinter. The above constitution can realize a pyroelectric ceramic composition that has a properly low insulating resistance and, at the same time, has good pyroelectric properties while having a high Curie temperature. Since the composition has a high Curie temperature, a thin-layer and small-size pyroelectric element, which can be subjected to reflow treatment, can be provided. Since the composition has low insulating resistance, in an infrared detector comprising a pyroelectric element using the above composition, there is no need to provide any load resistor parallel to the pyroelectric element. Accordingly, a size reduction can be realized.

The invention discloses a numerical control drilling machine for punching the surface of a mechanical part. The numerical control drilling machine comprises drilling machine bases, the tops of the drilling machine bases are fixedly sleeved with fastening connecting frames, the tops of the fastening connecting frames are fixedly sleeved with connecting supporting columns, and the middles of the outer surfaces of the connecting supporting columns are fixedly sleeved with mounting fixing frames. A drilling tool sliding frame is fixedly installed on one sides of the mounting fixing frames, the middle of the drilling tool sliding frame is fixedly sleeved with a sliding inner rack, the middle of the outer surface of the sliding inner rack is movably sleeved with a sliding connecting box, and a machining table is fixedly installed on one side of the drilling machine bases. When a part is drilled by the numerical control drilling machine, clamping force is improved, so that the mechanical part is fixed, clamping arm pressing feet are contracted while the clamping force is improved, the inner surfaces of the clamping arm pressing feet make friction contact with the outer surfaces of drilling tools, the rotating speed of the drilling tools is reduced through friction force, centripetal force of the drilling tools is reduced, the drilling tools are prevented from loosening, the phenomena of slipping and breaking of the drilling tools are avoided, and potential safety hazards are reduced.

The invention provides an outgoing line sealing structure of a transformer oil pump, belongs to the technical field of transformer oil pump sealing and solves the problem of an existing transformer oil pump that the sealing effect is poor. The outgoing line sealing structure of the transformer oil pump is characterized in that the transformer oil pump comprises pump body, a wiring hole is formed in the pump body, an external positioning block is arranged at the outer side of the pump body, and an internal positioning block is arranged at the inner side of the pump body; the internal positioning block, the external positioning block, a conductive rod and the pump body are fixedly connected with a fastener, a first sealing ring is arranged between the external positioning block and the pump body, and a second sealing ring is arranged between the external positioning block and the conductive rod; an inner end, arranged in the pump body, of the conductive rod is connected with a lead-out line; and the part, close to the inner end of the conductive rod, in the pump body is filled with a pouring sealant, the pouring sealant enables the lead-out line connected with the inner end of the conductive rod to be fixed in the pump body, and the pouring sealant blocks the gaps among the pump body, the internal positioning block, the conductive rod and the lead-out line. The outgoing line sealing structure improves the sealing effect and the safety performance of the transformer oil pump.

The present invention provides a flux which contains a resin having film forming ability, an activator and a solvent and is used when soldering is performed on the printed board to which electroless nickel plating is applied. The flux contains organic acid metallic salt of 0.1-20 wt.% to the total amount of the flux and, the activator is the same organic acid as an organic acid which comprises the organic acid metallic salt or an organic acid which is lower than it in acidity. Thus, the stability of the organic acid metallic salt is increased and high joining strength is maintained for a long term.

The purpose of the present invention is to suppress reduction in insulation resistance between an electrode and a case in an electrically heated catalyst (EHC). The EHC (1) of the present invention is provided with a heating element (3) that is heated by conduction and heats a catalyst; a case (4) that accommodates the heating element; an insulating member (5) that is provided between the heating element (3) and the case (4) and insulates against electricity; an electrode (7) connected to the heating element (3) via an electrode chamber (9) that is a space positioned between an inner wall surface of the case (4) and the outer peripheral surface of the heating element (3); and a ventilation passage (10) that ventilates the electrode chamber.

The invention relates to an electric heating catalyst. The purpose of the present invention is to prevent the decrease in the insulation resistance between an electrode and a case which is usually caused by the action of condensed water in an electric heating catalyst (EHC). This EHC (1) comprises a heating element (3) which can generate heat upon the conduction of an electric power to heat a catalyst, a case (4) which accommodates the heating element, and an insulating member (5) which is arranged between the heating element (3) and the case (4) and insulates an electric power. In the case (4) of the EHC (1), an electrode chamber (9), which is a space formed around an electrode (7) that is connected to the heating element (3), is closed by a closing member (10) which has higher air-tightness than those of the heating element (3) and the insulating member (5).

The invention discloses a high-efficiency cooling waterproof busbar groove specially for power transmission, which comprises a conductor connector insulation sleeve, cooling plates, fixedly-mounted clamping grooves, a branch jack cover plate and a bus clamping groove, wherein the branch jack cover plate is arranged in the middle position on the front surface of a jack insulation separator; connector insulation bolts are embedded inside a sealing plate at the connector side; and the cooling plates are arranged on the upper surface and the lower surface of a waterproof breathable layer. The high-efficiency cooling waterproof busbar groove specially for power transmission has the advantages that the structure is scientific and reasonable; the use is safe and convenient; the operation is simple; the work is quick; the functions are comprehensive; as the cooling plates are arranged when conductors in the bus clamping groove is electrified, much heat is generated, under effects of the cooling plates, heat in the bus clamping groove can be efficiently discharged, the conductor can be cooled quickly, and the conductive effects of the conductor are not influenced; and as the waterproof breathable layer is arranged, the bus is not easily dampened and permeable in the case of construction, and interphase insulation resistance is further not caused to fall.

The invention discloses a manufacturing method of a double-sided photoelectric substrate with interconnected high-density through holes. According to the method, the double-sided interconnected photoelectric ceramic substrate with the high-density micro-through holes is manufactured on the basis of the processes of manufacturing the micro-through holes in the ceramic substrate by a laser processing technology, filling the auxiliary through holes, flattening the surface, sputtering a film layer, manufacturing wiring lines and the like. The method is based on a fine processing technology of AlNceramic by laser. The manufacturing technology of the high-density micro-through-hole interconnection photoelectric device is studied, through the high-density micro-through-hole double-face interconnection technology, the double sides of the substrate are connected via the through holes, Au is filled in the through holes, and the problems that the back face of a photoelectric module device circuit needs to have corresponding functions and is connected with a front face graph and reliability is poor are solved. A metal film layer is prepared on the basis of a magnetron sputtering technology, the high-density micro-through-hole interconnection photoelectric device manufacturing technology is realized, a patterning process technology is carried out through a metallization layer, and a thickfilm hole filling process and a thin film patterning process are effectively combined.

A multilayer printed wiring board (10) includes a core substrate (20), an on-core-substrate insulating layer (26) laminated on the core substrate (20) and a capacitor section (40) provided on the on-core-substrate insulating layer (26). The capacitor section (40) is formed with a high dielectric layer (43) sandwiched between a lower electrode (41) storing a negative charge and an upper electrode (42) storing a positive charge. An ionization tendency of metal forming the lower electrode (41) is larger than an ionization tendency of metal forming the upper electrode (42). Metal forming the lowerelectrode (41) is nickel and metal forming the upper electrode (42) is copper, for example.

The invention discloses a sand-measuring ionization chamber which comprises an upper end tube and a lower end tube connected by a flange and is separated into two separate parts. The upper end tube isinternally provided with an amplifier plate, a high-voltage power source frame and a temperature sensor, and a high-voltage power source is mounted in the high-voltage power source frame; the lower end tube is internally provided with an electrode container and filled with high-voltage inert gas; the top end of the lower end tube is provided with an aluminum window; a ceramic insulator is weldedon the flange; a lead tube on the electrode container is connected with a high-voltage electrode on the high-voltage power source frame by the ceramic insulator; the other electrode on the high-voltage power source frame is connected with the input end of an amplifying circuit on the amplifier plate; the output end of the amplifying circuit on the amplifier plate is connected with a cable; and theother end of the cable is externally connected with a computer. The sand-measuring ionization chamber improves the efficiency of a 241 Am gamma radioactive source by more than one magnitude, uses theradioactive source with great activity, little Statistical error and good stability, has strong harsh environment toleration, good long-term signal stability, wide measuring range and low failure rate, thereby being suitable for the online measurement of the sediment concentration of underwater silt.

The invention discloses a novel ceramic capacitor and relates to an electronic component. The novel ceramic capacitor comprises a rectangular ceramic chip, a tin electrode is firmly connected with each of two opposite lateral surfaces of the ceramic chip, an epoxy resin packing layer is mounted at the outside of each of the ceramic chip and the tin electrodes, a pin is mounted on each of two tin electrodes, the cross section of each pin is rectangular, one end of each pin is firmly connected with the tin electrodes while the other end extends out of the epoxy resin packing layer, and a paint layer is respectively arranged between the ceramic chip and the epoxy resin packing layer, between the tin electrodes and the epoxy resin packing layer, and between the pins and the epoxy resin packing layer. The novel ceramic capacitor is simple in structure, is reasonable in design, is convenient to process, is capable of greatly improving the production efficiency, is large in capacitance, is suitable for such small communication equipments as mobile phone and palm computer, has good humidity resistance and is capable of preventing the outside water entering the ceramic chip in the ceramic capacitor so that the insulation resistance decrease and the undesirable voltage resistance of the ceramic capacitor due to moisture are avoided, and is practical.

The invention provides a conductive anode oxidation technology of aluminum and alloy parts thereof, which comprises the following steps: (a) alkaline corrosion: the aluminum and the alloy parts are put into an alkaline solution for removing an oxide skin generated in natural state; (b) bright dipping: the aluminum and the alloy parts are put into 40 to 70 percent nitric acid solution for removingthe dust so as to lead the aluminum and the alloy parts to expose metal luster; (c) anode oxidation: the aluminum and the alloy parts are put into a mixed electrolytic solution prepared by chromic salts and villaumite, 10 to 35V of voltage and 0.5 to 5A / dm<2> anodic current density are exerted to the solution at normal temperature, and the time for anode oxidation is 5 to 30min; and (e) drying. Afilm layer presents slightly transparent rainbow color and is bright, and has smooth and compact appearance. The technology has excellent welding performance, good electric conductivity and better antirust property, and solves the contradiction between the aluminum and the alloy parts, and the electric conductivity and the welding performance.

The invention discloses a class A flexible fireproof cable with combustion performance, which comprises a cable core, a protective layer and a metal protective layer from the inside to the outside; the cable core comprises a plurality of insulated wire cores twisted; Filled with filler material to form a cable core with a circular cross-section; the insulated wire core includes a conductor and an insulating layer wrapped outside the conductor; the insulating layer is an insulating material with a heat release value below 2.0MJ / kg; The filler material is inorganic fibers with a heat release value lower than 2.0 MJ / kg. The invention prepares the cable by using the insulating material and the filling material with the heat release value lower than 2.0MJ / kg, ensuring that the heat release value of the cable is lower than 2.0MJ / kg, meeting the requirements of Class A combustion performance and at the same time meeting the requirements of fire resistance performance .