1. A liquid-cooled rotary electric machine comprising:
a coolant inlet and a coolant outlet;
a stator having a central axis;
a rotor surrounded by the stator and having rotation relative to the stator about the central axis;
a jacket defining a heat transfer surface in conductive thermal communication with the stator, the jacket having opposite axial ends, an interior volume in which the stator and rotor are located, and an axial end portion having walls, the interior volume partially enclosed by the jacket axial end portion;
a fluid channel traversing the jacket heat transfer surface between the jacket axial ends;
a fluid passage defined by jacket axial end portion walls and in fluid communication with the fluid channel, a flow path of liquid coolant through the machine defined by the fluid channel and the fluid passage between the coolant inlet and the coolant outlet; and
a heat source in conductive thermal communication with a jacket axial end portion wall, whereby at least a portion of heat transferable between the heat source and the fluid passage is convectively transferable between the jacket axial end portion walls and liquid coolant along the flow path.
2. The machine of claim 1, wherein the fluid passage has first and second openings between which the flow path of liquid coolant through the machine extends, the fluid channel and the fluid passage fluidly connected to each other via one of the first and second openings.
3. The machine of claim 2, wherein the other of the first and second openings is fluidly connected to one of the coolant inlet and the coolant outlet.
4. The machine of claim 3, wherein the jacket axial end portion walls define a port isolated from the fluid passage and to which the fluid channel is fluidly connected, and the other of the coolant inlet and the coolant outlet is fluidly connected to the port.
5. The machine of claim 2, wherein the first and second openings are located at opposite ends of the fluid passage along the flow path.
6. The machine of claim 2, wherein the flow path is generally spiral-shaped between the first and second openings.
7. The machine of claim 2, wherein the flow path is substantially annular between the first and second openings.
8. The machine of claim 1, wherein the heat source is located axially adjacent to a jacket axial end portion wall relative to the central axis.
9. The machine of claim 1, wherein the heat source is located radially adjacent to a jacket axial end portion wall relative to the central axis.
10. The machine of claim 1, wherein the jacket axial end portion fully encloses the interior volume at one jacket axial end.
11. The machine of claim 1, wherein the fluid passage and the heat source do not overlap axially.
12. The machine of claim 1, wherein the machine comprises power electronics, and the heat source comprises the power electronics.
13. The machine of claim 12 wherein the machine comprises a cover disposed over the jacket axial end portion and defining the fluid passage, the power electronics disposed between the cover and a jacket axial end portion wall.
14. The machine of claim 1, wherein the machine comprises a bearing supported by the jacket axial end portion, the rotor is supported within the jacket interior volume by the bearing, and the heat source comprises the bearing.
15. The machine of claim 1, wherein the heat source is located axially between the rotor and the fluid passage.
16. The machine of claim 1, wherein relative to the central axis, a portion of the fluid passage extends radially outward of the heat source.
17. The machine of claim 1, further comprising a separable cover that defines the fluid passage, and wherein the fluid passage is located between the rotor and the cover in a direction parallel to the central axis.
18. The machine of claim 17, wherein the heat source is disposed axially between the cover and a jacket axial end portion wall.
19. The machine of claim 1, wherein the heat source is disposed axially between the rotor and the jacket axial end portion.
20. A method for liquid-cooling a rotary electric machine, comprising the steps of:
conveying liquid coolant along a fluid channel traversing a heat transfer surface of a jacket in conductive thermal communication with a stator surrounding a rotor, and along a fluid passage fluidly connected in series to the fluid channel and defined by a jacket axial end portion partially enclosing an interior volume in which the stator and rotor are located; and convectively transferring heat from the stator through the heat transfer surface and from a heat source in conductive thermal communication with a wall of the jacket axial end portion, to liquid coolant along a flow path defined by the fluid channel and the fluid passage that extends between a coolant inlet and a coolant outlet of the machine.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A droplet discharge device to discharge a droplet to a workpiece, comprising:
a head including a plurality of nozzle rows that have a plurality of nozzles on a nozzle surface in order to discharge the droplet of a supplied liquid;
an optical non-discharge nozzle detector to detect a nozzle row of the plurality of nozzle rows having a clogged nozzle as a non-discharge nozzle;
a suction device to seal the nozzle row including the non-discharge nozzle that is detected on the nozzle surface and performing suction from the nozzle row to eliminate clogging of the non-discharge nozzle; and
a moisture retaining device to seal the plurality of nozzle rows on the nozzle surface to retain moisture of the nozzle surface, wherein;
the droplet being discharged into the moisture retaining device and microvibration being applied to a liquid boundary in a one nozzle of the nozzle row by a driving element for discharge a droplet provided for the one nozzle, in order to prevent thickening of the liquid in the one nozzle that is not clogged and is normal in the nozzle row and prevent thickening of the liquid in the one nozzle from which clogging has been eliminated in the nozzle row.
2. The droplet discharge device according to claim 1, further comprising:
an operation unit to move the head relative to the suction device so as to align the nozzle row including the non-discharge nozzle with the suction device, and move the head relative to the moisture retaining device so as to align the plurality of nozzle rows with the moisture retaining device.
3. The droplet discharge device according to claim 1, the suction device being located near a position of the workpiece.
4. The droplet discharge device according to claim 1 the suction device including:
a first suction cap to perform suction on one nozzle row including the non-discharge nozzle; and
a second suction cap to perform suction simultaneously on a plurality of the nozzle rows including the non-discharge nozzle.
5. The droplet discharge device according to claim 4, further comprising:
a wiping device to wipe the part of the nozzle surface having the nozzle row including the non-discharge nozzle after suction by the suction device.
6. The droplet discharge device according to claim 4, an amount of suction from the nozzle surface by the suction device being increased depending on a pause time of the head immediately until an operation of discharging the droplet to the workpiece.
7. The droplet discharge device according to claim 6, an amount of suction from the nozzle surface by the suction device being increased if a rate of the non-discharge nozzle in the nozzle row is above a predetermined certain value.
8. A device to maintain discharge performance of a head with a nozzle surface, the device including a droplet discharge device to discharge a droplet from the head to a workpiece, comprising:
an optical non-discharge nozzle detector detecting a nozzle row in the head having a clogged nozzle as a non-discharge nozzle, the head including a plurality of nozzle rows that have a plurality of nozzles on the nozzle surface in order to discharge the droplet of a supplied liquid;
a suction device to seal the nozzle row including the non-discharge nozzle on the nozzle surface and taking suction from the nozzle row to eliminate clogging of the non-discharge nozzle; and
a moisture retaining device to seal the plurality of nozzle rows on the nozzle surface to retain moisture of the nozzle surface, wherein;
the droplet being discharged into the moisture retaining device and microvibration being applied to a liquid boundary in a one nozzle of the nozzle row by a driving element for discharge a droplet provided for the one nozzle, in order to prevent thickening of the liquid in the one nozzle that is not clogged and is normal in the nozzle row and prevent thickening of the liquid in the one nozzle from which clogging has been eliminated in the nozzle row.
9. A method to maintain discharge performance of a head with a nozzle surface in a droplet discharge device to discharge a droplet from the head to a workpiece, comprising:
detecting, by an optical non-discharge nozzle detector, a nozzle row in the head having a clogged nozzle as a non-discharge nozzle, the head including a plurality of nozzle rows that have a plurality of nozzles on the nozzle surface in order to discharge the droplet of a supplied liquid;
sealing, by a suction device, the nozzle row including the non-discharge nozzle on the nozzle surface and taking suction from the nozzle row to eliminate clogging of the non-discharge nozzle; and
sealing, by a moisture retaining device, the plurality of nozzle rows on the nozzle surface to retain moisture of the nozzle surface, wherein;
the droplet being discharged into the moisture retaining device and microvibration being applied to a liquid boundary in a one nozzle of the nozzle row by a driving element for discharge a droplet provided for the one nozzle, in order to prevent thickening of the liquid in the one nozzle that is not clogged and is normal in the nozzle row and prevent thickening of the liquid in the one nozzle from which clogging has been eliminated in the nozzle row.
10. A method to manufacture an electro-optical device, using a droplet discharge device to discharge a droplet from a head to a workpiece the method, comprising:
detecting, by an optical non-discharge nozzle detector, a nozzle row in the head having a clogged nozzle as a non-discharge nozzle, the head including a plurality of nozzle rows that have a plurality of nozzles on a nozzle surface in order to discharge the droplet of a supplied liquid;
sealing, by a suction device, the nozzle row including the non-discharge nozzle on the nozzle surface and taking suction from the nozzle row to eliminate clogging of the non-discharge nozzle;
sealing, by a moisture retaining device, the plurality of nozzle rows on the nozzle surface to retain moisture of the nozzle surface; and
discharging the droplet to the workpiece to manufacture an electro-optical device, wherein;
the droplet being discharged into the moisture retaining device and microvibration being applied to a liquid boundary in a one nozzle of the nozzle row by a driving element for discharge a droplet provided for the one nozzle, in order to prevent thickening of the liquid in the one nozzle that is not clogged and is normal in the nozzle row and prevent thickening of the liquid in the one nozzle from which clogging has been eliminated in the nozzle row.
11. An electro-optical device manufactured by using a droplet discharge device to discharge a droplet from a head to a workpiece, and manufactured by a method, the method comprising:
detecting, by an optical non-discharge nozzle detector, a nozzle row in the head having a clogged nozzle as a non-discharge nozzle, the head including a plurality of nozzle rows that have a plurality of nozzles on a nozzle surface in order to discharge the droplet of a supplied liquid;
sealing, by a suction device, the nozzle row including the non-discharge nozzle on the nozzle surface and taking suction from the nozzle row to eliminate clogging of the non-discharge nozzle;
sealing, by a moisture retaining device, the plurality of nozzle rows on the nozzle surface to retain moisture of the nozzle surface; and
discharging the droplet to the workpiece, wherein;
the droplet being discharged into the moisture retaining device and microvibration being applied to a liquid boundary in a one nozzle of the nozzle row by a driving element for discharge a droplet provided for the one nozzle, in order to prevent thickening of the liquid in the one nozzle that is not clogged and is normal in the nozzle row and prevent thickening of the liquid in the one nozzle from which clogging has been eliminated in the nozzle row.
12. An electronic apparatus, comprising:
the electro-optical device according to claim 11.