JP6000701B2 - Generator motor and electric vehicle using the same - Google Patents

Description

  The present invention relates to a generator motor and an electric vehicle using the same, and more particularly to a generator motor cooled by winding with a liquid refrigerant and an electric vehicle using the same.

  A rotating electrical machine such as a generator motor generates heat due to a loss when an energization current flows through the winding, and is therefore designed to be cooled so as not to exceed the heat resistance temperature of the insulation of the winding. In particular, when the energization current is large, sufficient cooling capacity may not be obtained if winding cooling is performed by air circulation or the like. There is a technique using a liquid refrigerant such as oil as a conventional method for cooling the winding in such a case, and FIG. 23 shows cooling of the winding of the rotating electrical machine by the liquid refrigerant.

  According to the conventional method shown in FIG. 23, the liquid refrigerant 20 that has passed through a refrigerant passage (not shown) from a tank or the like that stores liquid refrigerant (not shown) passes through the refrigerant supply ports 21a and 21b provided in the motor case 8, and It is dropped on the child winding 4. The liquid refrigerant 20 that has removed the heat from the winding 4 accumulates below the motor case 8 and is pressurized and fed from a refrigerant discharge port 22 by a pump (not shown) or by a rotating body (for example, a blade attached to the rotor 5). Scooped up and circulates through the refrigerant passage. At this time, the liquid refrigerant 20 dropped onto the armature winding 4 flows along the surface of the armature winding 4, but the armature winding 4 is substantially parallel to the axial direction of the shaft 6. A portion of the liquid refrigerant falls vertically downward without flowing in the axial direction of the stator core 1.

  Therefore, when cooling the rotating electrical machine by injecting the liquid refrigerant by dripping or applying pressure to the winding by its own weight, a method has been conventionally proposed in which a sufficient amount of liquid refrigerant is applied to each part of the winding. ing. For example, in Patent Document 1, uniform cooling is provided to each coil by guiding the nozzle to an outlet through an oil passage formed inside the magnetic core and opening the outlet to the inner surface of the coil of the core. It is disclosed to do.

  Further, in Patent Document 2, in a rotating electrical machine in which a refrigerant passage is formed in an axial direction inside a slot of a stator, the cross-sectional area of the refrigerant passage is greatly increased on the upstream side and decreased on the downstream side, and the refrigerant speed is increased on the downstream side. Thus, it is disclosed that the cooling unevenness on the inlet side and the outlet side is reduced.

  Further, in Patent Document 3, in the cooling structure of an electric motor mounted on a construction machine vehicle or the like, the oil does not always operate in a horizontal state, and an oil function is not impaired even in an inclined state of operation. A cooling structure is disclosed that prevents the cooling oil stored in the reservoir from acting as a stirring resistance against rotor rotation. That is, a cooling technique for a rotating electrical machine with respect to a vehicle tilt state in which the rotating electrical machine is mounted is disclosed.

JP 2009-240113 A JP 2003-289649 A JP 2009-71923 A

  By the way, in the winding cooling of the rotating electrical machine by the conventional method shown in FIG. 23, when the liquid refrigerant 20 is dropped from the vertically upper side where the refrigerant supply port 21 is present, the winding to the winding is performed by the circumferential slot position of the stator core 1. There may be a difference in the manner in which the liquid refrigerant is applied, and the winding temperature may become uneven. This is because a refrigerant supply port is provided at each winding end portion of the stator core 1 disposed on the upper portion of the shaft 6, and the liquid refrigerant to the lower winding end portion corresponds to the corresponding refrigerant supply. The liquid refrigerant leaking and dripping from the upper end of the winding flows outside the liquid refrigerant from the mouth, and a difference occurs in how the liquid refrigerant is applied. If the winding temperature becomes non-uniform, stress concentration due to non-uniform thermal expansion of the winding may occur, leading to winding breakage.

  In addition, when an oil passage is provided in the core as shown in Patent Document 1, an increase in oil pressure loss occurs when a highly viscous refrigerant is used. Occurs.

  Further, as shown in Patent Document 2 described above, the technique for obtaining a change in flow velocity by a change in refrigerant passage cross-sectional area requires circulation of an amount of refrigerant sufficient to fill the winding slot with the refrigerant. In a rotating electric machine having a large (size), there arises a problem that the refrigerant circulation device becomes large.

  Further, the above-mentioned Patent Document 3 discloses a winding cooling structure for an electric motor when the rotating shaft for driving the upper swing body of the construction machine is installed in the vertical direction. When the electric motor rotating shaft is installed in the horizontal direction, as in the case of an electric motor, the liquid refrigerant is applied in a different state when the vehicle body is tilted compared to the vertical installation. May cause uneven cooling.

  The problem to be solved by the present invention is to reduce the temperature of the winding wound around the slot equally regardless of the slot position of the stator core when cooling the winding using the liquid refrigerant. It is to improve the cooling performance and to prevent the cooling performance from being impaired even when a generator motor as a rotating electric machine is mounted on a vehicle whose body is inclined like a construction machine vehicle.

In order to solve the above problems, the present invention mainly adopts the following configuration.
A rotor having a rotating shaft; a stator core having a slot and teeth on the outer periphery of the rotor; an armature winding housed in the slot and wound around the teeth; and both axial ends of the rotating shaft Means for dropping or injecting a liquid refrigerant on the end of the armature winding arranged on the side, from both ends of the slot accommodating the armature winding toward the axial center of the rotary shaft The generator motor is provided with a liquid refrigerant flow path inclined downward.

  Further, in the generator motor, the liquid refrigerant flow path is provided in a gap existing between armature windings wound around adjacent teeth and accommodated in the same slot, and the liquid refrigerant flow path is inclined It is the structure which is a plate-shaped body or wedge-shaped spacer.

  A rotor having a rotating shaft; a stator core having a slot and teeth on the outer peripheral side of the rotor; an armature winding housed in the slot and wound around the teeth; and both axial ends of the rotating shaft A generator motor having means for dripping or injecting liquid refrigerant at an end of the armature winding disposed in the armature, a hydraulic pump connected to the rotating shaft and driven by the generator motor, and driven by the hydraulic pump A hydraulic actuator mounted on the flat surface and an inclined ground, mounted on the generator motor, the hydraulic pump, and the hydraulic actuator, from both ends of the slot containing the armature winding. A liquid refrigerant flow path that is inclined downward toward the axial center of the rotating shaft is provided, and a stator core at the top of the generator motor on the traveling body on the flat ground, The stator core at the top of the generator motor on the traveling body due to the inclination in the circumferential direction of the rotating shaft at the maximum inclined ground, and in all the stator core slots between those stator cores including On the other hand, an electric vehicle provided with the liquid refrigerant flow path.

  According to the present invention, the winding wound around the slot of the stator core can be cooled substantially in the axial direction, and the temperature of the winding for each slot can be reduced regardless of the slot position. It can be made non-uniform.

  In addition, when a generator motor is applied to an electric vehicle having severe temperature environment including an engine and a hydraulic pump, the significance of cooling of the armature winding can be further enhanced, and further, the work on the slope of the electric vehicle can be performed. In this case, the cooling performance can be prevented from being impaired.

It is sectional drawing which shows the flow path of the liquid refrigerant in the generator motor which concerns on Embodiment 1 of this invention. It is a figure which shows the internal structure of the slot in the A-A 'cross section of FIG. It is a figure which shows the internal structure of the slot in the B-B 'cross section of FIG. It is sectional drawing which shows the flow path of the liquid refrigerant in the generator motor which concerns on Embodiment 2 of this invention. It is a figure which shows the internal structure of the slot in the C-C 'cross section of FIG. It is a figure which shows the internal structure of the slot in the D-D 'cross section of FIG. It is a figure which shows the internal structure of the slot in the C-C 'cross section of FIG. 4 in the generator motor which concerns on Embodiment 3 of this invention. It is a figure which shows the internal structure of the slot in the D-D 'cross section of FIG. 4 in the generator motor which concerns on Embodiment 3 of this invention. It is sectional drawing which shows the flow path of the liquid refrigerant in the generator motor which concerns on Embodiment 4 of this invention. It is sectional drawing which shows the flow path of the liquid refrigerant in the generator motor which concerns on Embodiment 5 of this invention. It is a sketch which shows the winding bobbin attached to the stator core teeth in the generator motor which concerns on Embodiment 6 of this invention. It is a sketch which shows the winding bobbin and winding which were attached to the stator core teeth regarding this Embodiment 6. It is a sketch which shows the structure of the winding bobbin regarding this Embodiment 6, and the inclination refrigerant | coolant flow path attached to this. It is a figure which shows the internal structure of the slot in the cross section near the axial direction edge part of the generator motor which concerns on this Embodiment 6. FIG. It is a figure which shows the internal structure of the slot in the cross section in the axial direction center vicinity of the generator motor which concerns on this Embodiment 6. FIG. It is various modifications which show the left half of the inclined refrigerant flow path used in each embodiment of the present invention. It is a figure which shows arrangement | positioning of the rotating shaft circumferential direction of the spacer provided in the slot of the generator motor applied to the electric vehicle which concerns on Embodiment 7 of this invention. It is a sketch which shows the external appearance of the electric vehicle which applied the generator motor based on this Embodiment 7. FIG. It is a figure showing the condition where the electric vehicle which applied the generator motor based on this Embodiment 7 works on a sloping ground. It is a section lineblock diagram of an engine room in an electric vehicle to which a generator motor concerning this Embodiment 7 is applied. It is an exploded view which shows each component in the generator motor main body which concerns on embodiment of this invention. It is a figure which shows the structural example which injects a liquid refrigerant | coolant from an end bracket toward the coil | winding edge part of the generator motor which concerns on embodiment of this invention. It is a figure which shows the structural example which drops liquid refrigerant from a motor case toward the coil | winding edge part of the generator motor which concerns on embodiment of this invention.

  An outline of a generator motor as a rotating electrical machine according to an embodiment of the present invention will be described first with reference to FIGS. 21 to 23, 1 is a stator core, 4 is an armature winding, 5 is a rotor, 6 is a shaft, 7 is an end bracket, 8 is a motor case, 20 is a liquid refrigerant, and 21a and 21b are refrigerant supplies. The port, 22 is a refrigerant discharge port, 23a and 23b are refrigerant injection holes, 35 is an oil seal, and 36 is a ring.

  In FIG. 21, the rotor 5 has a permanent magnet as a field source, the stator core 1 has an armature winding 4, and cooling is performed by injecting liquid refrigerant 20 into the armature winding 4. It is a figure which shows the main body structure of a generator motor. In the main body of the generator motor shown in FIG. 21, a stator core 1 around which an armature winding 4 is wound is disposed on the concentric outer diameter side of the rotor 5, and a motor case 8 is disposed on the outer diameter side of the stator core 1. Has been placed.

  21 and 22, a ring 36 provided with refrigerant injection holes 23a and 23b for injecting the liquid refrigerant 20 is provided on both ends of the shaft 6 in the axial direction. The liquid refrigerant 20 supplied through the refrigerant path provided in the end bracket 7 is injected toward the armature winding 4 of the generator motor. The injected refrigerant 20 is stored in a tank (not shown) from below the motor case 8 via the refrigerant discharge port 22 and then reaches the refrigerant path of the end bracket 7 via an external pump (not shown). An oil seal 35 is provided at a position where the shaft 6 of the end bracket 7 penetrates.

  In addition, as a configuration example of the generator motor according to the embodiment of the present invention, as illustrated in FIG. 22, the configuration may be such that a liquid refrigerant applied with pressure by a pump or the like is injected from the side toward the winding, In addition to this configuration example, as shown in FIG. 23, a configuration in which the liquid refrigerant is dropped from above on both sides or one side of the winding end may be used. Furthermore, the embodiment of the present invention can also be applied to a configuration in which the liquid refrigerant stored below the motor case 8 is scooped up by the blades attached to the rotor of the generator motor and poured into the winding end.

  And, simply speaking, the characteristics of the generator motor according to the embodiment of the present invention is to uniformly cool the winding wound around the slot of the stator core in the axial direction, thereby enhancing the cooling effect. Furthermore, the temperature distribution is prevented from being biased between the windings wound in the respective slots from the uppermost slot to the lower slot.

  In short, the characteristics of the electric vehicle using the generator motor according to the embodiment of the present invention can be simply described. This has led to a further increase in the significance and necessity of cooling in the axially equivalent cooling and the cooling between the windings in the circumferential direction of the rotating shaft, and further, as the electric vehicle operates or works on sloping ground, In particular, the windings in the circumferential direction of the rotating shaft are cooled without deviation.

  And the concrete structure and effect of the generator motor which concerns on embodiment of this invention and the electric vehicle to which this is applied are explained in full detail in each following embodiment.

“Embodiment 1”
A generator motor according to Embodiment 1 of the present invention will be described below with reference to FIGS. 1, 2, 3, and 16. 1 is a cross-sectional view showing a flow path of a liquid refrigerant in a generator motor according to Embodiment 1 of the present invention. However, the region above the center line indicated by the alternate long and short dash line in FIG. 23 is shown. 2 and 3 are views showing the internal structure of the slots in the AA ′ cross section and the BB ′ cross section of FIG. 1, respectively, and the rotor is not shown.

  The stator core 1 has a tooth 2 and a slot 3, and the armature windings 4a and 4a 'housed in the slot 3 are wound around the tooth 2a, and the armature windings 4b and 4b' are wound around the tooth 2b. ing. 2 and 3, the insulating sheet 12 is a sheet for insulating the winding 4, and the winding support 13 is for supporting the winding 4 at an appropriate position in the slot 3, and is also called cuttings. Is done.

  Liquid refrigerant 20 that has passed through a refrigerant passage (not shown) from a tank or the like that stores liquid refrigerant (not shown) is dropped onto both ends of armature winding 4 in the generator motor through refrigerant supply ports 21a and 21b provided in motor case 8. . The liquid refrigerant 20 that has removed heat from the armature winding 4 accumulates below the motor case 8 and is pressurized by a pump or the like (not shown) from the refrigerant discharge port 22 (see FIG. 23) to circulate through the refrigerant passage.

  Here, in the first embodiment, one of the features is that the inclined plate 14 is provided in the slot 3 of the stator core 1. The inclined plate 14 is provided between the armature windings 4 a and 4 b in the slot 3 and is inclined from the axial end of the stator core 1 toward the center. In FIG. 2 (A-A ′ cross section), it is located on the radially outer peripheral side of the generator motor, and in FIG. 3 (B-B ′ cross section), it is located on the radially inner peripheral side of the generator motor.

  According to the example shown in FIG. 1, the inclined plate 14 is inclined so that the central portion in the axial direction is the lowest. The inclined plate 14 is provided outside the top of the stator core 1 and at least in the slots 3 adjacent to both of them. In addition, you may provide the inclination board 14 of the same shape in all the slots 3 located in the upper rank of the shaft 6. FIG. In the example of FIG. 2, the inclined plate 14 is installed in the space by effectively utilizing an existing space between the windings 4 a and 4 b. The inclined plate 14 is preferably made of an insulator such as a resin from the viewpoint of electrical insulation.

  The liquid refrigerant that has been dripped onto the end of the winding (FIG. 1) or injected toward the winding (FIG. 22) and introduced in the axial direction is the gap between the inclined plate 14 and the insulating sheet 12 in the slot 3. Then, it passes through the gap between the insulating sheet 12 and the winding support 13 and flows to the inner diameter side (rotor side) of the generator motor. When the amount of inflow is larger than the flow rate flowing through the gap, a path is formed that convects in the flow path and flows through both ends of the winding. Here, referring to FIG. 1, the convection in the flow path means that the liquid refrigerant heated by winding heat generation at the bottom of the V-shaped inclined plate 14 rises by convection and reaches each end. This is the returning phenomenon.

  With the configuration of the present embodiment, the liquid refrigerant that has flowed through the armature winding 4 is introduced to the center of the stator core 1 in the axial direction through the inclined plate 14. Thereby, the quantity of the liquid refrigerant | coolant which propagates the armature winding 4 increases, and cooling capacity improves. According to this embodiment, in addition to the effective utilization of the empty space formed between the windings 4a and 4b, the cooling performance is further improved due to the convection phenomenon caused by the V-shaped inclined plate.

  In addition, the inclined refrigerant flow path employed in the present embodiment has a constant angle such as a V shape as shown in FIG. Up to flat and then inclined, (b) changing the inclination angle from the middle, (c) first reducing the curvature and increasing the curvature from the middle, (d) first increasing the curvature and starting from the middle Anything that makes the curvature small is acceptable. FIG. 16 shows various modified examples showing the left half of the refrigerant flow path inclined between both ends of the winding used in each embodiment of the present invention.

  Whether to select one of FIG. 1 or FIG. 16 as the inclined shape of the refrigerant flow path is determined in consideration of the viscosity of the liquid refrigerant, the leakage amount from the refrigerant flow path, the heating value of the winding, and the like. Good. Moreover, although the bottommost part of the inclined plate 14 was demonstrated as an axial center part, it is not restricted to this, The position which shifted | deviated from the center part may be a bottom part, and a bottom part is not restricted to one point of a point. A flat portion having a width may be used.

  The various modifications shown in FIG. 16 described above are applicable not only to the first embodiment of the present invention but also to the embodiments described below.

  As shown in FIG. 1, the inclined plate 14 in the first embodiment has a shape inclined downward from both ends of the winding 4 toward the center in the rotation axis direction. Alternatively, since the liquid refrigerant dropped on one end portion flows through the winding by the guide of the inclined plate 14, the cooling of the winding can be performed substantially equally over the axial direction of the winding (no inclined plate is provided). In the conventional example, the liquid refrigerant dripped at the winding end rarely flows into the central portion of the winding, and most of it leaks into the lower winding end).

  As shown in FIG. 2 and FIG. 3, by providing the inclined plate 14 in addition to the slot located at the top, almost all of the liquid refrigerant dropped or injected flows into the winding with the corresponding inclined plate. The windings wound in the slot provided with the inclined plate 14 can be expected to have substantially the same cooling effect (in the conventional example where no inclined plate is provided, the lower winding that has leaked from the upper winding end portion). More liquid refrigerant will pour into the end of the line, which will make a difference in the cooling effect). The above-described cooling effect on the winding is an effect that is commonly exhibited in the embodiments described below.

“Embodiment 2”
A generator motor according to Embodiment 2 of the present invention will be described below with reference to FIGS. 4, 5, and 6. FIG. 4 is a cross-sectional view showing the flow path of the liquid refrigerant in the generator motor according to Embodiment 2 of the present invention. However, the region above the center line indicated by the alternate long and short dash line in FIG. 23 is shown. FIGS. 5 and 6 are views showing the internal configuration of the slots in the CC ′ and DD ′ cross sections of FIG. 4, respectively, and the rotor is not shown.

  Here, in the second embodiment, one feature is that the spacer 11 is provided in the slot 3 of the stator core 1. The spacer 11 has a triangular cross section in the illustrated example of FIG. 5, is provided between the armature windings 4 a and 4 b in the slot 3, and the upper surface of the spacer 11 is the axis of the stator core 1. It has a wedge shape that is inclined from the end in the direction toward the center in the axial direction (see FIG. 4), and is shown in FIG. 6 (DD ′ cross section) as compared to FIG. 5 (CC ′ cross section). Is reduced by an inclined shape toward the center in the axial direction. The spacer 11 is preferably made of an insulator such as resin from the viewpoint of electrical insulation. Other configurations are the same as those of the first embodiment.

  With the configuration of the second embodiment, the liquid refrigerant introduced into both ends of the armature winding 4 is guided to the axial center of the stator core 1 through the upper surface of the spacer 11. By forming such a refrigerant flow path, the amount of liquid refrigerant flowing along the armature winding 4 is increased, and the cooling capacity is improved.

  Also, as shown in FIGS. 4 to 6, the refrigerant flow path in the slot 3 is formed by the spacer 11, thereby facilitating the support and fixing of the winding 4 and the insulating sheet 12 in the slot 3. Misalignment between the wire 4 and the insulating sheet 12 can be prevented and the refrigerant flow area can be reliably maintained.

“Embodiment 3”
A generator motor according to Embodiment 3 of the present invention will be described below with reference to FIGS. 4, 7, and 8. FIG. 4 is a cross-sectional view showing the flow path of the liquid refrigerant in the generator motor according to Embodiment 3 of the present invention. 7 and 8 are views showing the internal configuration of the slots in the CC ′ section and the DD ′ section in FIG. 4, respectively, and the rotor is not shown.

  Here, the third embodiment is characterized in that a winding support integrated spacer 31 is provided in the slot 3 of the stator core 1. The winding support integrated spacer 31 has a convex shape interposed between the armature windings 4a and 4b in the slot 3, and a flat shape that supports the winding on the inner diameter side. The top surface of this convex shape is a shape that is inclined from both axial ends of the stator core toward the axial center, and is compared with FIG. 7 (CC ′ cross section) in FIG. 8 (DD ′ cross section). The cross-sectional area of the convex shape shown in the figure is reduced by the inclined shape toward the center in the axial direction. The winding support part integrated spacer 31 is preferably formed of resin or the like. Other configurations are the same as those of the second embodiment.

  With the configuration of the third embodiment, the liquid refrigerant introduced into both end portions of the armature winding 4 passes through the upper surface of the convex shape of the winding support unit-integrated spacer 31 and the axial center of the stator core 1. Led to. By forming such a refrigerant flow path, the amount of liquid refrigerant flowing along the armature winding 4 is increased, and the cooling capacity is improved.

  Further, as shown in FIGS. 7 and 8, the winding support part integrated spacer 31 forms a refrigerant flow path in the slot 3 to support and fix the winding 4 and the insulating sheet 12 in the slot 3. In addition to facilitating the position difference between the winding 4 and the insulating sheet 12, it is possible to reliably maintain the refrigerant flow path area.

  In the third embodiment, the number of parts can be reduced by integrating the winding support portion and the spacer, and this can be realized without an increase in cost from the conventional generator motor.

“Embodiment 4”
A generator motor according to Embodiment 4 of the present invention will be described below with reference to FIG. FIG. 9 is a cross-sectional view showing the flow path of the liquid refrigerant in the generator motor according to Embodiment 4 of the present invention. However, the region above the center line indicated by the alternate long and short dash line in FIG. 23 is shown.

  Here, in the fourth embodiment, compared with the first embodiment shown in FIGS. 1 to 3, an inclined plate 14 is provided between the armature windings 4 a and 4 b in the slot 3 of the stator core 1. It is the same as that of the first embodiment that the inclined plate 14 is inclined from the both axial ends of the stator core 1 toward the center. The fourth embodiment is different from the first embodiment in that the inclined plate 14 extends in both axial end directions of the stator core 1 at both ends of the stator core 1. There is a gap between adjacent winding ends of the winding ends protruding from the stator core 1, and the fourth embodiment has a structure in which the inclined plate 14 is installed in this gap. The inclined plate 14 is preferably made of an insulator such as resin. Other configurations are the same as those of the first embodiment.

  With the configuration of the fourth embodiment, in addition to the liquid refrigerant flowing along the armature winding 4, the dropped liquid refrigerant is received by the inclined plate 14 that is extended and guided to the axial center of the stator core 1. . This further increases the amount of liquid refrigerant along the armature winding 4 and improves the cooling capacity.

  In the fourth embodiment, an example is shown in which the inclined plate extends to both ends of the inclined plate 14 of the first embodiment. However, both ends of the spacer 11 of the second embodiment or the winding support integrated spacer 31 of the third embodiment are used. Even in the modified example that extends, the same effect as the inclined plate of the fourth embodiment can be obtained.

“Embodiment 5”
A generator motor according to Embodiment 5 of the present invention will be described below with reference to FIG. FIG. 10 is a cross-sectional view showing the flow path of the liquid refrigerant in the generator motor according to the fifth embodiment of the present invention. However, the region above the center line indicated by the alternate long and short dash line in FIG. 23 is shown.

  Here, the fifth embodiment is common to the second embodiment in that the spacer 11 is provided in the slot 3 of the stator core 1 as compared with the second embodiment shown in FIGS. The fifth embodiment differs from the second embodiment in that a liquid refrigerant vent hole 15 is provided in the central portion of the stator core 1.

  According to the configuration of the fifth embodiment, in addition to the liquid refrigerant flowing along the armature winding 4, the dropped liquid refrigerant is introduced into the axial center of the stator core 1 through the upper surface of the spacer 11, and then It reaches the inner diameter side from the liquid refrigerant vent 15 and drops onto the rotor 5. Thereby, even when heat is generated in the rotor 5 due to eddy current loss or the like, cooling with the liquid refrigerant is possible.

  In addition, it is possible to prevent the liquid refrigerant that has become hot due to the heat generated by the armature winding 4 from staying in the slot.

“Embodiment 6”
A generator motor according to Embodiment 6 of the present invention will be described below with reference to FIGS. FIG. 11 is a sketch showing a winding bobbin attached to a stator core tooth in a generator motor according to Embodiment 6 of the present invention. FIG. 12 is a sketch showing the winding bobbin and the winding attached to the stator core teeth according to the sixth embodiment. FIG. 13 is a sketch showing the structure of the winding bobbin and the inclined refrigerant flow path attached thereto according to the sixth embodiment. FIG. 14 is a diagram showing a slot configuration in a cross section in the vicinity of the end portion in the axial direction of the generator motor according to the sixth embodiment. FIG. 15 is a view showing a slot configuration in a cross section near the center in the axial direction of the generator motor according to the sixth embodiment.

  FIG. 11 shows a stator structure in which a stator iron core is divided at each slot position in the circumferential direction of the rotation axis, and a winding bobbin 32 attached to one tooth. The winding bobbin 32 is divided into two in the axial direction of the rotating shaft, and is attached to the tooth 2 so as to be sandwiched from the axial direction. FIG. 12 shows a state where the winding bobbin 32 around which the armature winding 4 is wound is attached to the tooth 2.

  In the sixth embodiment, as shown in FIG. 13, one feature is that a winding bobbin 32 is provided and an inclined refrigerant flow path 33 is attached to the winding bobbin 32. A vertical sectional view in the axial direction according to the sixth embodiment is shown in FIGS. FIG. 14 is a diagram illustrating a slot configuration in the vicinity of the end portion in the axial direction in the sixth embodiment, and the inclined refrigerant flow path 33 is located on the outer diameter side in the radial direction of the rotating shaft. On the other hand, FIG. 15 is a diagram showing a slot configuration near the center in the axial direction in the sixth embodiment, and the inclined refrigerant flow path 33 is located closer to the inner diameter side in the radial direction of the rotating shaft than in FIG.

  With the configuration of the sixth embodiment, the liquid refrigerant that has flowed through the armature winding 4 is guided to the center in the axial direction of the stator core 1 through the inclined refrigerant flow path 33. As a result, the amount of liquid refrigerant flowing along the armature winding 4 is further increased, and the cooling capacity is further improved. Further, by forming the inclined refrigerant flow path 33 integrally with the winding bobbin 32 as in the sixth embodiment, the number of parts is reduced and assembly is facilitated.

“Embodiment 7”
The electric vehicle to which the generator motor according to the seventh embodiment of the present invention is applied will be described below with reference to FIGS. First, an electric vehicle according to Embodiment 7 of the present invention will be described below with reference to FIGS. FIG. 18 is a sketch diagram showing the appearance of an electric vehicle to which the generator motor according to the seventh embodiment is applied, and FIG. 19 is a diagram illustrating a situation in which the electric vehicle to which the generator motor according to the seventh embodiment is applied works on an inclined land. FIG. 20 is a cross-sectional configuration diagram of an engine room in an electric vehicle to which the generator motor according to the seventh embodiment is applied.

  18 to 20, an electric vehicle (hydraulic excavator) includes a traveling body 41, a revolving body 42 that is turnable on the traveling body 41, a cab 43 provided on the left front side of the revolving body 42, An articulated engine chamber 44 arranged horizontally on the body 42, a counterweight 45 provided at the rear of the revolving body 42, and a multi-joint comprising a boom 461, an arm 462, and a bucket 463 provided at the front of the revolving body 42 And a mold front device 46.

  The traveling body 41 includes an endless track crawler 411 on the left and right, and is driven by the driving force of the traveling motor 412. A revolving body 42 including an engine chamber 44 and an articulated front device 46 is provided by a turning motor (not shown) provided at the center of the revolving body 42 (separate from the generator motor 50 according to the present embodiment). It is turned with respect to the traveling body 41. The boom 461, the arm 462, and the bucket 463 that constitute the multi-joint type front device 46 are driven by a boom cylinder, an arm cylinder, and a bucket cylinder 47 that are provided respectively.

  The various cylinders 47, the traveling motor 412, and the turning motor described above use hydraulic actuators and are operated by the engine 51 and / or the generator motor 50 in the engine compartment 44 in response to an operation by the operator in the cab 43. It is driven by pressure oil from a control valve device that controls pressure oil from the driven hydraulic pump 52.

  Here, the generator motor 50 has the configuration shown in FIGS. 1 to 17 and is applied to an electric vehicle as a drive source of the hydraulic pump 52. The generator motor 50 has a flywheel 511 and an internal combustion engine. An engine 51 including an engine unit 512 and a hydraulic pump 52 including a gear 521 and a hydraulic mechanism unit 522 are disposed with a shaft 6 interposed therebetween. In other words, the generator motor 50 used in this embodiment is configured to be sandwiched between the engine 51 and the hydraulic pump 52. The engine 51 may not be an essential component, and the electric vehicle may be configured by a generator motor 50 and a hydraulic pump 52.

  The engine chamber 44 includes an engine 51, a generator motor 50, and a hydraulic pump 52. In addition to this, a radiator 56 that cools the cooling water of the engine 51 and a cooling air P that cools the radiator 56 are generated. Cooling fan 57, suction port 70 for taking in air flow (cooling air) P and introducing it into cooling fan 57, discharge port 71 for discharging air flow P to the outside, sound absorber 72, and cooling of engine 51 A crankshaft 58, a fan belt 59, an auxiliary rotating shaft 60 that transmits to the fan 57, vibration damping means 55 for installing the engine 51, a frame 54, a muffler 73 that silences exhaust gas from the engine 51, and each component Covers (upper cover 531, suction side lateral cover 532, lower cover 533, discharge side lateral cover 534) are mainly provided. As described above, the generator motor 50 according to the seventh embodiment is disposed in the engine room 44 on the revolving structure 42 in the electric vehicle in association with each component as shown in FIG.

  As shown in FIG. 19, in the electric vehicle to which the generator motor according to the seventh embodiment is applied, when excavation work is performed on the slope 49, the traveling body 41 first rises on the slope 49, and then the turning body 42. And the engine chamber 44 is disposed horizontally to perform the operation. In the work example shown in FIG. 19, in the electric vehicle according to the seventh embodiment, the shaft (rotary shaft) 6 of the applied generator motor is inclined in the circumferential direction and horizontal in the axial direction. The electric vehicle is not limited to the inclination of the rotating shaft in the circumferential direction, but may naturally work when the electric vehicle is inclined in the axial direction of the rotating shaft.

  Since the generator motor 50 in the electric vehicle shown in FIG. 20 is sandwiched between the engine 51 as a heat source and the hydraulic pump 52 and installed in a high temperature environment, the armature winding of the generator motor The need to perform cooling is sought and the necessity of cooling has arisen. On the other hand, since the electric vehicle operates or works on an inclined land, the same cooling effect as that on a flat ground can be expected even when the generator motor mounted on the electric vehicle is inclined.

In order to achieve the effect of cooling the armature winding both in the above-described high temperature environment and in operation or work in an inclined place, from the end of the winding described in the end of the first embodiment to the center in the axial direction. The two configurations, that is, the configuration of the inclined refrigerant flow path toward the top and the configuration of the above-described inclined refrigerant flow path at the uppermost slot in the circumferential direction of the rotation axis and the slot below it, are necessary and sufficient conditions. is there. That is, using the above-mentioned two configurations for the electric vehicle according to the seventh embodiment is an optimal example.
FIG. 17 is a diagram illustrating the arrangement in the circumferential direction of the rotation axis of the spacer provided in the slot of the generator motor applied to the electric vehicle according to the seventh embodiment. When a generator motor is mounted on an electric vehicle (for example, a hydraulic excavator), the generator motor is connected to the hydraulic pump 52 to drive the hydraulic pump 52 as shown in FIG. A certain shaft 6 is mounted on the vehicle so as to be substantially horizontal when the electric vehicle is operated on a flat ground. However, an electric vehicle is not limited to a flat ground, and may work on an inclined ground 49 as shown in FIG. 19, and it is a standard rule that an electric vehicle can work at a maximum inclination angle of 30 degrees.

  In the illustrated example of FIG. 17, the slot configuration of the generator motor will be described on the assumption that the inclination in the circumferential direction of the shaft 6 is a maximum of 30 degrees. In the illustrated example, the spacers 11a, 11b, and 11c as shown in the second embodiment are provided in the slots 3a, 3b, and 3c within 45 degrees from the vertical axis e-e '. In the illustrated example, since there are 12 slots for 360 degrees of the entire circumference of the stator, one slot is 30 degrees, and even if the electric vehicle is tilted 30 degrees, the slot corresponding to the highest position is the lowest. The spacer 11a or 11c is always provided. In the electric vehicle, the installation of the spacer 11 shown in FIG. 5 or the winding support integrated spacer 31 shown in FIG. 7 in the slot is considered in consideration of the fact that the electric vehicle travels with vibration. It is effective in maintaining the holding state.

  Note that the range in which the spacer is provided is not limited to 45 degrees as described above, and may be a maximum inclination angle of the electric vehicle +5 to 20 degrees. Further, by providing spacers as shown in the second embodiment in all slots positioned above the rotating shaft 6, it is possible to aim at maintaining the cooling capacity even in the case of the inclination of the maximum angle of the electric vehicle.

  The inclination of the electric vehicle is not limited to the inclination in the circumferential direction of the rotating shaft 6 as described above, but the inclination in the axial direction of the rotating shaft 6 is also conceivable. The inclined refrigerant flow path provided between the winding ends is formed so that the central portion occupies the lowest position, so that the liquid refrigerant accumulates in the refrigerant flow path even if the axial direction of the rotating shaft is inclined. Thus, the winding cooling function is achieved.

  As described above, in the seventh embodiment, even when the electric vehicle is working on a sloping ground, the liquid refrigerant that has flowed through the armature winding 4 passes through the upper surfaces of the spacers 11a, 11b, and 11c and the stator core 1 Guided to the center in the axial direction. Therefore, even when the electric vehicle is mounted on a vehicle such as a construction machine vehicle (for example, a hydraulic excavator) in which the vehicle body is inclined, the cooling capacity can be maintained.

DESCRIPTION OF SYMBOLS 1 Stator iron core 2,2a, 2b Teeth 3,3a, 3b, 3c Slot 4,4a, 4b, 4a ', 4b' Armature winding 5 Rotor 6 Shaft 7 End bracket 8 Motor case 11, 11a, 11b, 11c Spacer 12 Insulation sheet 13 Winding support (cuttings)
Reference Signs List 14 Inclined Plate 15 Liquid Refrigerant Hole 20 Liquid Refrigerant 21a, 21b Refrigerant Supply Port 22 Refrigerant Discharge Port 23a, 23b Refrigerant Injection Hole 31 Winding Support Part Integrated Spacer 32 Winding Bobbin 33 Inclined Refrigerant Channel 35 Oil Seal 36 Ring 41 Running body 411 Endless track crawler 412 Traveling motor 42 Rotating body 43 Driver's cab 44 Engine room 45 Counterweight 46 Articulated front device 461 Boom 462 Arm 463 Bucket 47 Cylinder 49 Inclined ground 50 Generator motor 51 Engine 511 Flywheel 512 Internal combustion engine section 52 Hydraulic pump 521 Gear 522 Hydraulic mechanism portion 531 Upper cover 532 Suction side lateral cover 533 Lower cover 534 Discharge side lateral cover 54 Frame 55 Vibration damping means 56 Radiator 57 Cooling fan 58 Crankshaft 5 Fan belt 60 auxiliary rotating shaft 70 inlet 71 discharge port 72 sound absorber 73 Muffler P airflow (cooling air)

Claims (11)

A rotor having a rotating shaft; a stator core having a slot and teeth on the outer periphery of the rotor; an armature winding housed in the slot and wound around the teeth; and both axial ends of the rotating shaft Means for dripping or injecting a liquid refrigerant at an end of the armature winding disposed on the side,
A generator motor provided with a liquid refrigerant flow path that inclines downward from both ends of a slot accommodating the armature winding toward an axial center of the rotating shaft. The generator motor according to claim 1,
The liquid refrigerant flow path is a generator motor provided in a gap between armature windings wound around adjacent teeth and accommodated in the same slot. The generator motor according to claim 2,
The liquid refrigerant flow path is a generator motor that is an inclined plate-like body. The generator motor according to claim 2,
A generator motor in which a wedge-shaped spacer is provided between the armature windings, and an upper surface of the spacer serves as the liquid refrigerant flow path . The generator motor according to claim 4,
The spacer, the generator motor is composed of armature windings to each other in the same slot integrally with the winding supporting portion for supporting an inner diameter side of the rotation shaft. The generator motor according to any one of claims 1 to 5,
The liquid refrigerant channel is a generator motor that extends from an end of the stator core in the axial direction to an end of the armature winding. The generator motor according to any one of claims 1 to 5,
The liquid refrigerant channel is a generator motor in which a central hole in the axial direction is provided with a vent hole through which the liquid refrigerant flows in the radial direction of the rotating shaft. A rotor having a rotating shaft, a stator core having slots and teeth on the outer peripheral side of the rotor, and a two-part winding attached to the teeth from both ends in the axial direction of the rotating shaft dropping or injection and the bobbin, and an armature winding accommodated in the slots are wound around the winding bobbin, the liquid refrigerant to the ends of the armature windings arranged on the axial end side of said rotary shaft And means for
A generator motor provided integrally with the winding bobbin with a liquid refrigerant passage inclined downward from both ends of a slot accommodating the armature winding toward the axial center of the rotating shaft. A rotor having a rotating shaft, a stator core having slots and teeth on the outer peripheral side of the rotor, armature windings housed in the slots and wound around the teeth, and arranged on both ends in the axial direction of the rotating shaft. A generator motor having means for dripping or injecting a liquid refrigerant at an end of the armature winding,
A hydraulic pump coupled to the rotating shaft and driven by the generator motor;
A hydraulic actuator driven by the hydraulic pump;
The generator motor, the hydraulic pump, and the hydraulic actuator are mounted, and a traveling body that travels on flat and inclined ground, and
A liquid refrigerant flow path that is inclined downward from the both ends of the slot containing the armature winding toward the center in the axial direction of the rotary shaft;
The stator core at the uppermost position of the generator motor on the traveling body on the flat ground and the stator core at the uppermost position of the generator motor on the traveling body due to the inclination in the circumferential direction of the rotation axis at the maximum slope specified. And an electric vehicle in which the liquid refrigerant flow path is provided for all the stator core slots between the stator cores. The electric vehicle according to claim 9,
A wedge-shaped spacer is provided in a gap between armature windings wound around adjacent teeth and accommodated in the same slot,
An electric vehicle in which an upper surface of the spacer serves as the liquid refrigerant flow path . The electric vehicle according to claim 10,
The spacer, the electric vehicle is configured armature winding each other in the same slot integrally with the winding supporting portion for supporting an inner diameter side of the rotation shaft.