Abstract: This three-phase AC motor drive device is provided with: a load; an inverter device 1 for driving the load; an MCOK_A_4 connected between the inverter device 1 and the load and electrically connecting or disconnecting the inverter device 1 to or from the load; a voltage detector 21a having terminals respectively connected to the circuits of at least two phases to detect the voltages between the three phases; and a current detector 11 for detecting the currents of the three phases. In the connection from the inverter device 1 to the load, the inverter device 1, the MCOK_A_4, the voltage detector 21a, the current detector 11, and the load are aligned in this order.

Abstract: This three-phase AC motor drive device is provided with: a load; an inverter device 1 for driving the load; an MCOK_A_4 connected between the inverter device 1 and the load and electrically connecting or disconnecting the inverter device 1 to or from the load; a voltage detector 21a having terminals respectively connected to the circuits of at least two phases to detect the voltages between the three phases; and a current detector 11 for detecting the currents of the three phases. In the connection from the inverter device 1 to the load, the inverter device 1, the MCOK_A_4, the voltage detector 21a, the current detector 11, and the load are aligned in this order.

Abstract: A power conversion device achieves size reduction and reliability by reducing the number of components of the system. The power conversion device has a semiconductor module of a half-bridge configuration in which two semiconductor elements are arranged in series. The semiconductor module has a cuboidal shape and has, along a longitudinal direction thereof, a positive pole terminal, a negative pole terminal, and terminals for inputting or outputting alternating current or for forming a single phase of the power conversion device. In the vertical direction corresponding to a widthwise direction of the cuboid, a plurality of the semiconductor modules are arranged vertically, forming a plurality of phases of the power conversion device. The semiconductor modules of the plurality of phases are installed in contact with a cooling unit, and one or more capacitors are disposed so as to face the cooling unit across the semiconductor modules of the plurality of phases.

Abstract: A power conversion device achieves size reduction and reliability by reducing the number of components of the system. The power conversion device has a semiconductor module of a half-bridge configuration in which two semiconductor elements are arranged in series. The semiconductor module has a cuboidal shape and has, along a longitudinal direction thereof, a positive pole terminal, a negative pole terminal, and terminals for inputting or outputting alternating current or for forming a single phase of the power conversion device. In the vertical direction corresponding to a widthwise direction of the cuboid, a plurality of the semiconductor modules are arranged vertically, forming a plurality of phases of the power conversion device. The semiconductor modules of the plurality of phases are installed in contact with a cooling unit, and one or more capacitors are disposed so as to face the cooling unit across the semiconductor modules of the plurality of phases.

Abstract: A gear-integrated electric motor is provided with a motor (1) generating a driving force by input of electricity, a gear mechanism (2) converting the driving force of the motor, and a housing (8) containing the motor and the gear mechanism, and used in a horizontal position in which a motor shaft (1s) and a gear output shaft (2s) become substantially horizontal. The gear-integrated electric motor includes at least one heat pipe (3) which has an evaporation portion (3e) disposed in a motor area of the housing, and a condensation portion (3c) disposed in a gear mechanism area of the housing and higher than the evaporation portion with respect to the vertical direction in the horizontal position.

Abstract: The present invention equalizes the temperatures of semiconductor elements and efficiently cools the semiconductor elements in a lightweight device configuration, by optimally combining the configurations of heat radiation fins in accordance with the configuration of the semiconductor elements. A traction converter includes plural semiconductor elements included in a traction converting circuit and a cooler to radiate heat from the plural semiconductor elements to outside air, the cooler including a heat receiving block, plural heat pipes and plural heat radiation fins, the plural semiconductor elements being arrayed on one surface of the heat receiving block, heat receiving parts of the plural heat pipes being buried in the opposite surface of the heat receiving block, heat radiation parts of the plural heat pipes being erectly provided so as to protrude from the heat receiving block, the plural heat radiation fins being joined to the heat radiation parts.

Abstract: The construction machine including an engine room having an engine, a radiator ii for cooling the engine, and a hydraulic pump which are arranged therein, and a counterweight area which is located adjacent to the engine room and in which batteries are installed, a ventilation passage for cooling the engine room and a ventilation passage for cooling the batteries are formed separately and independently in the substantially same direction, and a flowing direction of cooling air flowing in the ventilation passage for cooling the engine room and a flowing direction of cooling air flowing in the ventilation passage for cooling the batteries are substantially parallel to each other.

Abstract: A gear-integrated electric motor is provided with a motor (1) generating a driving force by input of electricity, a gear mechanism (2) converting the driving force of the motor, and a housing (8) containing the motor and the gear mechanism, and used in a horizontal position in which a motor shaft (1s) and a gear output shaft (2s) become substantially horizontal. The gear-integrated electric motor includes at least one heat pipe (3) which has an evaporation portion (3e) disposed in a motor area of the housing, and a condensation portion (3c) disposed in a gear mechanism area of the housing and higher than the evaporation portion with respect to the vertical direction in the horizontal position.

Abstract: [Object] To provide a cooling structure for a construction machine which can efficiently discharge heat generated in batteries and prevent exhaust air of an engine room from being sucked in the batteries. [Solution Means] In a cooling structure for a construction machine, the construction machine including an engine room 5 having an engine 4, a radiator 11 for cooling the engine 4, and a hydraulic pump 7 which are arranged therein, and a counterweight area 6 which is located adjacent to the engine room 5 and in which batteries 27 are installed, a ventilation passage 23 for cooling the engine room 5 and a ventilation passage 34 for cooling the batteries 27 are formed separately and independently in the substantially same direction, and a flowing direction of cooling air flowing in the ventilation passage 23 for cooling the engine room 5 and a flowing direction of cooling air flowing in the ventilation passage 34 for cooling the batteries 27 are substantially parallel to each other.

Abstract: An edge light display unit includes light generating sources, a substrate mounting the light generating sources, a lens, a diffusion plate expanding light input in a side surface of the diffusion plate as to irradiate a front surface of the diffusion plate, and a heat sink thermally contacted with the substrate. A base portion of the heat sink has a substrate mounting surface and a fin constituting surface substantially perpendicular to the substrate mounting surface. At least one fin extends from the fin constituting surface in a direction substantially perpendicular thereto and along the plurality of light generating sources in a direction parallel to substrate. An air supply and exhaust surface of a cooling air are formed in a back surface side of the display unit.

Abstract: In an electronic apparatus having a heat-generating element therein, a cooling jacket 100 for transmitting heat generated from the heat-generating element 200 into to a liquid coolant flowing therein, comprises: a cover 130 building up a heat transfer surface to be in contact with a surface of the heat-generating element; a passage 110 for the liquid coolant, which is formed neighboring with the heat transfer surface and wound round in a “S”-like manner within an inside of a main body 120 of the cooling jacket; and an inlet 111 and an outlet 112 attached at both ends of the flow passage of the liquid coolant, and further a dispersion member 150 is disposed in the flow passage, being built up by gathering a plural number of members, each of which has a “U”-like cross-section of an aspect ratio from 10 to 20, thereby diffusing the liquid coolant therein, so as to transfer the heat from the heat-generating element thereto with high efficiency, and thereby enabling to cool down the heat-generating element, fully,

Abstract: A liquid crystal projector, a liquid crystal panel, and a liquid cooling apparatus, for obtaining a picture without disturbance due to a liquid coolant passing through a transparent surface of the liquid crystal panel, with achieving cooling effectively with an aid of a liquid cooling cycle, wherein lights from a light source 112 is divided into three (3) parallel light beams,

Abstract: In the case that the LED is used as a light source for a backlight such as a display unit or the like, if a lot of current is circulated for securing a brightness, a lot of heat is generated in view of a characteristic of the LED, so that the LED comes to a high temperature, and there is a problem that the characteristic of the LED itself is deteriorated such as a light output is lowered, a long-term service life can not secured, or the like. Further, in the case that a temperature difference exists between a plurality of LEDs, there is a problem that it appears as a brightness irregularity of a screen of the display unit.

Abstract: In an electronic apparatus having a heat-generating element therein, a cooling jacket 100 for transmitting heat generated from the heat-generating element 200 into to a liquid coolant flowing therein, comprises: a cover 130 building up a heat transfer surface to be in contact with a surface of the heat-generating element; a passage 110 for the liquid coolant, which is formed neighboring with the heat transfer surface and wound round in a “S”-like manner within an inside of a main body 120 of the cooling jacket; and an inlet 111 and an outlet 112 attached at both ends of the flow passage of the liquid coolant, and further a dispersion member 150 is disposed in the flow passage, being built up by gathering a plural number of members, each of which has a “U”-like cross-section of an aspect ratio from 10 to 20, thereby diffusing the liquid coolant therein, so as to transfer the heat from the heat-generating element thereto with high efficiency, and thereby enabling to cool down the heat-generating element, fully,

Abstract: An object of the present invention is to provide a thyristor valve arrester capable of measuring leakage currents of arrester elements in a simple construction and a DC power transmission thyristor valve having it used therein.A multiple of laminated arrester sets are arranged in parallel with a multiple of thyristor valves. Each arrester set is made of a plurality of arrester units arranged in parallel. Each adjoining arrester sets has through an insulator an inter-stage connecting conductor therebetween at a position corresponding to the respective thyristor valve terminals. An end of each arrester set and the respective inter-stage connecting conductors have a leakage current ammeter and a surge counter connected therebetween in electrical parallel. Each inter-stage connecting conductor and the respective thyristor valve stage are connected together by a thyristor valve connecting conductor.