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51. 发明专利

JPH11234929A GENERATOR STATOR 失效
公开(公告)号：JPH11234929A
公开(公告)日：1999-08-27
申请号：JP3583898
申请日：1998-02-18
申请人： HITACHI LTD
发明人： HAGIWARA SHUYA , ONODA MITSURU , KAMIYA HIROYUKI
IPC分类号： H02K1/20 , H02K3/34
摘要： PROBLEM TO BE SOLVED: To provide a generator with excellent insulation reliability of insulating layers and long operation life, by disposing core blocks with dust spacers in-between, fitting stator coils in grooves formed in the core blocks to assemble the coils, and selecting the material of the duct spacers and silicon steel plates for forming the core blocks, so that the coefficient of linear expansion of the duct spacer material is higher than the coefficient of linear expansion of the silicon steel plates for forming the core blocks. SOLUTION: Since insulating layers 42a, 42b, 42c, 42d are usually formed by compacting mica pieces with synthetic resin, they are distorted when stress is applied and can be separated or cracked when application of stress is repeated. In the generator 1, duct spacers 32a, 32b,..., 32m are formed of a material the coefficient of thermal expansion of which is larger than that of silicon steel plates constituting core blocks. As a result, when conductors 4a, 4b in coils are thermally expanded due to temperature rise during operation, the amount of thermal expansion in the stator core 3 can be increased to reduce the difference in displacement between them so that the stress exerted on the insulating layers 42a, 42b, 42c, 42d is reduced, and thus deterioration in the insulating layers can be prevented.

52. 发明专利

JPH10149933A IGNITION COIL AND INTERNAL COMBUSTION ENGINE USING IT 失效
公开(公告)号：JPH10149933A
公开(公告)日：1998-06-02
申请号：JP30796596
申请日：1996-11-19
申请人： HITACHI LTD
发明人： SATO TAKANORI , TAKEUCHI RYOZO , OISHI HIDETOSHI , HAGIWARA SHUYA
IPC分类号： H01F38/12
摘要： PROBLEM TO BE SOLVED: To provide an ignition coil of excellent durability. SOLUTION: An ignition coil 10 is constituted in such a way that the part between a center iron core 11 having a protruding part and a secondary coil bobbin 21 on which a secondary coil 22 is wound is filled with an insulating resin 26. Between the center iron core 11 and the secondary coil bobbin 21, a crack deterrent tube 13 is placed so as to deter occurrence or development of a minute crack of the insulating resin 26 or the secondary coil bobbin 21 occurring with the protruding part as the starting point.

53. 发明专利

JPH0980029A DIAGNOSTIC METHOD FOR INSULATION 失效
公开(公告)号：JPH0980029A
公开(公告)日：1997-03-28
申请号：JP23414195
申请日：1995-09-12
申请人： HITACHI LTD
发明人： MIYAO HIROSHI , SATO TAKANORI , HAGIWARA SHUYA , KAMIYA HIROYUKI , ONODA MITSURU
IPC分类号： G01R31/12 , G01N21/27 , G01N27/92 , G01N29/12
摘要： PROBLEM TO BE SOLVED: To obtain a diagnostic method in which the insulation degradation state of an electric apparatus can be diagnosed with better accuracy by a method wherein the exfoliation state in the interior of an insulating layer is inspected, a maximum discharge electric charge amount is corrected according to its inspection result and a residual breakdown voltage is found. SOLUTION: First, the exfoliation state in the interior of an insulating layer is inspected. Its inspection can be performed nondestructivrely by analyzing the hammering sound of the insulating layer. The hammering sound can be analyzed, e.g. by dividing an octave spectrum analytical distribution into patterns. Then, according to the inspection result of the exfoliation state, an exfoliation factor A is found, a maximum discharge electric charge amount Qm is corrected, a computing operation is performed by an expression Vr=100-a.(Δ-b)-c.log(Qm.A/d) by using a corrected maximum discharge electric charge amount Qm.A, and a residual breakdown voltage Vr is found. In the expression, Δ represents an electric discharge parameter, (a), (b) and (c) represent respective factors decided separately according to the material or the like of the insulatinglayer, and (d) represents the thickness of the insulating layer. The exfoliation factor A is a nonelectric parameter, and it reflects the exfoliation state at the inside of the insulating layer.

54. 发明专利

JPH0935962A IGNITION COIL 失效
公开(公告)号：JPH0935962A
公开(公告)日：1997-02-07
申请号：JP18292395
申请日：1995-07-19
申请人： HITACHI LTD
发明人： SATO TAKANORI , HAGIWARA SHUYA , TAKEUCHI RYOZO
IPC分类号： H01F38/12 , H01F30/00
摘要： PROBLEM TO BE SOLVED: To provide an ignition coil, in which the variation of performance is reduced and which has excellent assembly properties. SOLUTION: A core 20, in which a magnetic-saturation preventive means is contained in a part of a magnetic path and which forms a closed magnetic circuit, and a primary coil 21 and a secondary coil 22 wound on the core and generating magnetic flux are composed, and a mixture magnetic substance 202b consisting of a magnetic material and a non-magnetic material is used as the magnetic-saturation preventive means.

55. 发明专利

JPH08322102A LOW-NOISE AERODYNAMIC DEVICE AND LOW-NOISE ACHIEVING METHOD 失效
公开(公告)号：JPH08322102A
公开(公告)日：1996-12-03
申请号：JP12471195
申请日：1995-05-24
申请人： HITACHI LTD
发明人： IIDA AKIYOSHI , OTAGURO TOSHIO , HAGIWARA SHUYA , MAKINO TOSHIAKI , KOBAYASHI KENJI , KATO CHIYUKI , KAKEHI YUTAKA , HATTORI MORISHIGE
IPC分类号： B60L5/00
摘要： PURPOSE: To decrease the noises when running at high-speed by aligning the stream around the disks by ribs, which are attached to the disk surfaces of an insulator in approximately parallel with the stream, and suppressing the acoustic resonance generated from the approximately parallel disks. CONSTITUTION: A plurality of approximately parallel disks 3, which increase the distance along the surface with a supporting post 2 and enhance the electric insulation, are arranged. A plurality of rib-shaped surface roughness elements 4, which are approximately in parallel with a stream for changing the parallelism of the surfaces of the disks 3 and have the same size as the thickness of the boundary around the disks 3, are arranged on the surfaces of the disks 3. Thus, the resonance caused by the aerodynamic noises of the aerodynamic device is suppressed, and the low noise is achieved.

56. 发明专利

JPH08289510A METHOD AND APPARATUS FOR HARDENING COIL INSULATING LAYER 失效
公开(公告)号：JPH08289510A
公开(公告)日：1996-11-01
申请号：JP8726695
申请日：1995-04-12
申请人： HITACHI LTD
发明人： HAGIWARA SHUYA , SATO TAKANORI , TAKEUCHI RYOZO , KOYAMA TORU , KAMIYA HIROYUKI , ONODA MITSURU , FURUKAWA NOBUAKI , KOTANI YOICHI
IPC分类号： H02K3/34 , H02K15/12
摘要： PURPOSE: To provide a method and an apparatus for hardening a coil insulating layer, which can improve the insulating characteristic of the coil insulating layer for electric machine formed by using thermosetting resin. CONSTITUTION: Respective coils 1a...1n are compressed with compressors 2a...2n and heated. Thermosetting resin is hardened, and an insulating layer is formed. In this step, the change in capacitance of the coil measured with a capacitance measuring device 11 is monitored by a controller 12. At the time when the capacitance of each coil becomes the maximum value, tightening is performed with the compressors 2a...2n corresponding to the respective coils 1a...1n. Thereafter, the capacitance is decreased. The monitoring is continuded, furthermore. At the time when the predetermined control value is reached, the heating is stopped.

57. 发明专利

JPH07123507A CURRENT COLLECTOR FOR VEHICLE 失效
公开(公告)号：JPH07123507A
公开(公告)日：1995-05-12
申请号：JP26689393
申请日：1993-10-26
申请人： HITACHI LTD , HITACHI KASADO ENG KK , SHIN MEIWA IND CO LTD
发明人： HAGIWARA SHUYA , SATO KAZUHIRO , HATTORI MORISHIGE , HARA KUNIYOSHI , KAKEHI YUTAKA , TERADA KATSUYUKI , KOYAGO RIICHI
IPC分类号： B60L5/08 , B60L5/20 , B60L5/22
摘要： PURPOSE:To provide a low noise current collector excellent in controllability, response, and arc resistance which is suitably employed in a high speed rolling stock. CONSTITUTION:The current collector 20 comprises a main structure, i.e., a conductive mechanism, including a current collecting body 22 which holds sliders 21a, 21b for collecting the current through contact with a stringing 1, a supporting insulator 30, and a cable head 50, and a housing dome 4. An actuator adjusts the current collecting body 22 vertically, along with the supporting insulator 30, so that a correct contacting force is sustained constantly between the stringing 1 and the sliders 21a, 21b. The current collecting body 22 is molded of a fiber reinforced composite material and a protective board 24 of light metal is disposed oppositely to the stringing 1 thus enhancing the controllability through reduction of weight and protecting the current collecting body against damage due to arc and high temperature molten metal powder produced thereby.

58. 发明专利

JPH07107608A CURRENT COLLECTOR FOR VEHICLE AND INSULATOR THEREFOR 失效
公开(公告)号：JPH07107608A
公开(公告)日：1995-04-21
申请号：JP24677593
申请日：1993-10-01
申请人： HITACHI LTD , HITACHI KASADO ENG KK , HITACHI CHEMICAL CO LTD , HITACHI CABLE
发明人： HAGIWARA SHUYA , HATTORI MORISHIGE , HARA KUNIYOSHI , TERADA KATSUYUKI , KADOTANI KENZO , SASAKI MASAYUKI
IPC分类号： H01R41/00 , B60L5/08 , B60L5/22 , H01B17/00 , H01B17/14 , H01B17/26
摘要： PURPOSE:To provide a low noise current collector excellent in controllability and response being employed suitably in high speed rolling stock and an insulator therefor. CONSTITUTION:The current collector comprises a current collecting body 22 holding a slider 21 for collecting current from a stringing 1, a supporting insulator 30 therefor, a flexible conductor 51 for conducting power, and a cable head 50 for connecting a flexible cable 5a. An actuator 32 and the current collecting body 22 are regulated vertically along with the supporting insulator 30 so that the contacting force between the stringing 1 and the slider 21 has a correct value. A light polymer resin insulator is employed as the supporting insulator 30 and a ceramic insulator having high insulation reliability is employed as the cable head 50. A hollow supporting insulator 30 filled with an insulating foamed material is employed in order to realize both light weight and high insulation reliability. Furthermore, the central axis of an insulator rod is set in front of the central axis of umbrella in the advancing direction of vehicle in order to compensate for the dielectric deterioration due to the atmospheric pressure drop on the back of the insulator during high speed travel thus enhancing the insulation reliability.

59. 发明专利

JPH06141544A AC-DC CONVERTER 失效
公开(公告)号：JPH06141544A
公开(公告)日：1994-05-20
申请号：JP28452292
申请日：1992-10-22
申请人： HITACHI LTD
发明人： KANOUDA TAMAHIKO , TAKAHASHI TADASHI , HORIE HIDEAKI , ONDA KENICHI , HAGIWARA SHUYA
IPC分类号： H01F27/28 , H02M3/28
摘要： PURPOSE:To provide an AC-DC converter in which a downsized thin transformer is employed without sacrifice of withstand voltage and without increasing the switching frequency of a switching element. CONSTITUTION:The AC-DC converter comprises two charge accumulating means 3, 4 connected in series between AC input terminals 2a, 2b, a rectifying means 5 having input side connected across one charge accumulating means 4, a thin transformer 7 having primary and secondary windings 7a, 7b, a power switching element 8 connected in series with the primary winding 7a and coupled to the output side of the rectifying means 5 along with the primary winding 7a, and rectifying/smoothing means 9, 10 having input sides connected with the secondary winding 7b and the output sides connected with DC output terminals 12a, 12b. A plurality of wire conductors are wound spirally and concentrically around a wire core conductor through dielectric films to produce a composite conductor which is then wound spirally and flatly to constitute the thin transformer 7.

60. 发明专利

JPH05227746A CURRENT CONTROL CIRCUIT 失效
公开(公告)号：JPH05227746A
公开(公告)日：1993-09-03
申请号：JP3036892
申请日：1992-02-18
申请人： HITACHI LTD
发明人： KANOUDA TAMAHIKO , SATO MASAYOSHI , ONDA KENICHI , HAGIWARA SHUYA , MIZOGUCHI TETSURO , KONO NAOFUMI , FUJIKAWA KATSUMI , KINO JIRO
IPC分类号： H02M3/28
摘要： PURPOSE:To get a current circuit of low loss suitable for a high frequency switching power source by integrating a power MOSFET and a current detecting circuit on the same semiconductor substrate, and taking out one part of the unit cell of the power MOSFET to the other electrode. CONSTITUTION:For a current control circuit, when a power MOSFET 11 is tuned on, a current circulates from a rectifying smoothing circuit 2 to the primary side of a transformer 4 and a closed loop, and power is supplied to the secondary circuit, and shot diodes 5a and 5b rectify a high frequency AC, and a chock coil 6 and a capacitor 7 smooth it so as to control the voltage supplied to load 8 to be constant. Next, a feeble current equivalent to the cell ratio among a main current flows to a current detecting circuit 13 by connecting only the source electrodes of about 1-0.1% cells to the current detecting circuit 13, among the cells of the power MOSFET 11. This converts it into voltage and inputs it into a peak hold circuit 14, and only while a current flows to the MOSFET 11, it receives the output voltage, and during off, it holds the voltage level that it received at on.

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