Abstract: In an IPM motor according to one aspect of the present disclosure, in a magnet structure installed in a magnet hole, a first soft magnetic body is located outside a first permanent magnet in a radial direction. Since the first soft magnetic body has a higher electrical resistivity than the electrical resistivity of a rotor core, a situation where an eddy current occurs in the first soft magnetic body is suppressed. In the IPM motor, a deterioration in efficiency caused by an eddy current loss is suppressed, so that the efficiency is improved.

Abstract: In an IPM motor according to one aspect of the present disclosure, in a magnet structure installed in a magnet hole, a first soft magnetic body is located outside a first permanent magnet in a radial direction. Since the first soft magnetic body has a higher electrical resistivity than the electrical resistivity of a rotor core, a situation where an eddy current occurs in the first soft magnetic body is suppressed. In the IPM motor, a deterioration in efficiency caused by an eddy current loss is suppressed, so that the efficiency is improved.

Abstract: A heat treatment apparatus includes: a furnace core tube made of silica glass; a heater provided adjacent to the furnace core tube, the heater heating a heating region; and a moving mechanism supporting a porous glass base material and relatively moving the porous glass base material with respect to the heater in the furnace core tube in a state where the heating region is heated by the heater to make the porous glass base material pass through the heating region. The heat treatment apparatus includes a thin-walled part provided in a region adjacent to a portion located in the heating region in the furnace core tube, the thin-walled part having a thickness of glass less than that of the portion located in the heating region.

Abstract: A computer includes a first module, a second module controlled by the first module, a first connector connectable to the first module, a second connector connectable to either the first module or the second module, and a data transmission line configured to connect the first connector to the second connector. The first module includes a switch configured to electrically connect the data transmission line to the first module attached to the first connector. The switch breaks an electrical connection between the data transmission line and the first module attached to the second connector. Thus, it is possible to improve expandability in the computer acting as a server. Additionally, it is possible to prevent complexity of design and increased cost in manufacturing servers.

Abstract: A computer includes a first module, a second module controlled by the first module, a first connector connectible to the first module, a second connector connectible to either the first module or the second module, and a data transmission line configured to connect the first connector to the second connector via a plurality of lanes. The order of lanes of the first module is reverse to the order of lanes of the second module while the order of lanes of the first connector is reverse to the order of lanes of the second connector. Thus, it is possible to improve the expandability of the computer acting as a server. Additionally, it is possible to prevent complexity of design and increased cost in expanding the functions of servers.

Abstract: A server device having a plurality of server modules and a plurality of cooling fans in a chassis includes: a management unit configured to control the server modules; and a temperature measurement part configured to perform measurement of temperatures of the server modules. The management unit is configured to decide a server module to run on a basis of a result of the measurement by the temperature measurement part.

Abstract: A computer includes: first and second connectors; and a data transmission path. The first connector includes: a first connector body to which at least a first module is capable of being attached; and a first electrode portion which is connected with the data transmission path. The first electrode portion is electrically connected with the first module when the first module is attached to the first connector body. The second connector includes: a second connector body to which at least the first module and a second module are alternatively capable of being attached; and a second electrode portion which is connected with the data transmission path. The second electrode portion is electrically connected with the second module when the second module is attached to the second connector body. The second electrode portion is electrically disconnected from the first module when the first module is attached to the second connector body.

Abstract: A server device having a plurality of server modules and a plurality of cooling fans in a chassis includes: a control unit configured to control the server modules and the cooling fans, which can be placed in predetermined positions. The control unit is configured to decide a server module and a cooling fan to become targets of operation status control from among the server modules and the cooling fans, on a basis of location information showing locations of the server modules and the cooling fans.

Abstract: A server device having a plurality of server modules and a plurality of cooling fans in a chassis includes: a management unit configured to control the server modules; and a temperature measurement part configured to perform measurement of temperatures of the server modules. The management unit is configured to decide a server module to run on a basis of a result of the measurement by the temperature measurement part.

Abstract: A server device having a plurality of server modules and a plurality of cooling fans in a chassis includes: a control unit configured to control the server modules and the cooling fans, which can be placed in predetermined positions. The control unit is configured to decide a server module and a cooling fan to become targets of operation status control from among the server modules and the cooling fans, on a basis of location information showing locations of the server modules and the cooling fans.

Abstract: It is an object of the present invention to allow a furnace core tube used for a heat treatment apparatus of a porous glass base material to be used for a long period of time. A heat treatment apparatus includes: a furnace core tube made of silica glass; a heater provided adjacent to the furnace core tube, the heater heating a heating region; and a moving mechanism supporting a porous glass base material and relatively moving the porous glass base material with respect to the heater in the furnace core tube in a state where the heating region is heated by the heater to make the porous glass base material pass through the heating region. The heat treatment apparatus includes a thin-walled part provided in a region adjacent to a portion located in the heating region in the furnace core tube, the thin-walled part having a thickness of glass less than that of the portion located in the heating region.

Abstract: A sintering apparatus for sintering a porous glass base material, including a furnace core tube surrounded by heaters, the furnace core tube housing the porous glass base material; a lid member having an insertion hole through which a holding rod coupled with the porous glass base material is inserted, the lid member mounted at one end of the furnace core tube; a sealing chamber having a supply port that introduces seal gas and a discharging port that discharges the seal gas, the sealing chamber provided at the lid member covering the insertion hole; and a cylindrical member that causes a pressure difference between gas inside of the tube of an inside the furnace core tube and gas inside of the sealing chamber to be generated while the holding rod is inserted through the cylindrical member inside of the sealing chamber.

Abstract: A sintering apparatus heat-treats a porous glass preform for an optical fiber at a high temperature. The sintering apparatus includes: a glass preform elevating/lowering mechanism; a furnace core tube having an upper part having an opening part into which the glass preform is inserted by the elevating/lowering mechanism, and made of quartz glass; a heating furnace disposed on an outer circumference of the furnace core tube; an upper lid for closing the opening part of the furnace core tube; and a sealing member holding mechanism included in the upper lid and configured to hold a sealing member interposed between the opening part and the upper lid.

Abstract: A computer includes: first and second connectors; and a data transmission path. The first connector includes: a first connector body to which at least a first module is capable of being attached; and a first electrode portion which is connected with the data transmission path. The first electrode portion is electrically connected with the first module when the first module is attached to the first connector body. The second connector includes: a second connector body to which at least the first module and a second module are alternatively capable of being attached; and a second electrode portion which is connected with the data transmission path. The second electrode portion is electrically connected with the second module when the second module is attached to the second connector body. The second electrode portion is electrically disconnected from the first module when the first module is attached to the second connector body.

Abstract: A computer includes a first module, a second module controlled by the first module, a first connector connectible to the first module, a second connector connectible to either the first module or the second module, and a data transmission line configured to connect the first connector to the second connector via a plurality of lanes. The order of lanes of the first module is reverse to the order of lanes of the second module while the order of lanes of the first connector is reverse to the order of lanes of the second connector. Thus, it is possible to improve the expandability of the computer acting as a server. Additionally, it is possible to prevent complexity of design and increased cost in expanding the functions of servers.

Abstract: A computer includes a first module, a second module controlled by the first module, a first connector connectable to the first module, a second connector connectable to either the first module or the second module, and a data transmission line configured to connect the first connector to the second connector. The first module includes a switch configured to electrically connect the data transmission line to the first module attached to the first connector. The switch breaks an electrical connection between the data transmission line and the first module attached to the second connector. Thus, it is possible to improve expandability in the computer acting as a server. Additionally, it is possible to prevent complexity of design and increased cost in manufacturing servers.

Abstract: A sintering apparatus for sintering a porous glass base material, including a furnace core tube surrounded by heaters, the furnace core tube housing the porous glass base material; a lid member having an insertion hole through which a holding rod coupled with the porous glass base material is inserted, the lid member mounted at one end of the furnace core tube; a sealing chamber having a supply port that introduces seal gas and a discharging port that discharges the seal gas, the sealing chamber provided at the lid member covering the insertion hole; and a cylindrical member that causes a pressure difference between gas inside of the tube of an inside the furnace core tube and gas inside of the sealing chamber to be generated while the holding rod is inserted through the cylindrical member inside of the sealing chamber.

Abstract: The present invention provides an apparatus for sintering a glass preform for an optical fiber, wherein the glass preform for the optical fiber is received in a muffle tube and is heated in an atmospheric gas while being suspended on a shaft and supported thereon, the apparatus comprising: a first gas seal that is provided at an upper end of the muffle tube, the shaft being inserted therethrough; a buffering chamber that is provided above the first gas seal and that covers the shaft; a second gas seal that is provided at an upper end of the buffering chamber, the shaft being inserted therethrough; and a unit that introduces the atmospheric gas exhausted from the muffle tube into the buffering chamber.

Abstract: Provided is an optical fiber glass base material manufacturing apparatus, including a furnace core tube that houses a porous glass base material; a movement mechanism that moves the porous glass base material in a longitudinal direction thereof in the furnace core tube; a first heating section that heats and dehydrates the porous glass base material in the furnace core tube; and a second heating section that is arranged downstream from the first heating section in a movement direction of the porous glass base material, and sinters the porous glass base material by heating a portion of the porous glass base material in the longitudinal direction.

Abstract: A sintering apparatus heat-treats a porous glass preform for an optical fiber at a high temperature. The sintering apparatus includes: a glass preform elevating/lowering mechanism; a furnace core tube having an upper part having an opening part into which the glass preform is inserted by the elevating/lowering mechanism, and made of quartz glass; a heating furnace disposed on an outer circumference of the furnace core tube; an upper lid for closing the opening part of the furnace core tube; and a sealing member holding mechanism included in the upper lid and configured to hold a sealing member interposed between the opening part and the upper lid.