JP2010220340A - Rotary electric machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotary electric machine that cools the inside of a rotor, and ensures the circulation performance of a refrigerant in the rotor while suppressing the enlargement of a pump. <P>SOLUTION: The rotary electric machine 100 includes a rotating shaft 110 which has a first refrigerant passage 101 through which the refrigerant 180 can pass and is rotatably arranged with a rotational axial line O as a center, and edges 125, 126 which are arranged in the direction of the rotational axial line O. The rotary electric machine also includes a rotor 120 fixed to the rotating shaft 110. In the rotor 120, there are formed a second refrigerant passage 130 which is formed in a position close to the edge 125 rather than the edge 126, connected to the first refrigerant passage 101, and extended in the radial direction, an oil sump 131 which is connected to the second refrigerant passage 130, formed in a position close to the edge 125 rather than the edge 126, and can store the refrigerant 180, and an axial passage 134 which is connected to the oil sump 131 and extended to the edge 126 from the oil sump 131. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a rotating electrical machine, and more particularly to a rotating electrical machine in which a rotor is cooled.

  In recent years, rotating electric machines have been proposed in which oil or air is allowed to flow through the rotor to cool the rotor or the stator coil.

  For example, a rotating electrical machine described in Japanese Patent Application Laid-Open No. 2005-6429 includes a stator core and a rotatable rotor disposed on the inner peripheral side of the hollow portion of the stator core.

  A rotating shaft cooling oil passage is formed on the rotating shaft of the rotor, and a rotating shaft branching oil passage is connected to the rotating shaft cooling oil passage. The rotating shaft branch oil passage is connected to the rotor cooling oil passage, and the rotor cooling oil passage is connected to the rotor end face oil passage. The rotor end face oil passage is connected to the ejection hole. The coolant ejected from the ejection holes is guided to the coil end of the stator. Further, the rotating electrical machine includes a pump for feeding the coolant into the rotating shaft cooling oil passage.

  A motor described in Japanese Patent Application Laid-Open No. 2008-178243 includes a rotor and a stator, and an oil passage for magnet cooling is formed in the rotor. One end of the magnet cooling oil passage is an open end, and an oil hole is formed on the open end side.

  A motor described in Japanese Patent Laid-Open No. 9-182375 includes a rotor including a rotor shaft and a core, a plate provided on an end surface of the core, a stator, a cooling circuit for cooling the rotor, and supply means for supplying oil. It has.

  The cooling circuit includes an axial oil passage formed in the rotor shaft, a radial oil passage communicating with the axial oil passage, an axial oil formed in the core and penetrating radially inward of the permanent magnet in the axial direction. Including roads. Further, the cooling circuit includes an oil hole that communicates with the axial passage and opens radially inward of the coil end of the stator.

  The rotating electrical machine described in Japanese Utility Model Laid-Open No. 6-48355 includes a rotor core, and the rotor core has air holes that are open at both ends. The air hole is inclined so that the air hole is inclined with respect to the rotation center line so that the distance between the one opening part of the air hole and the rotation center axis line is different from the distance between the other opening part and the rotation center axis line. Forming.

  A rotating electrical machine described in Japanese Patent Application Laid-Open No. 2006-300101 includes a rotating shaft in which an oil passage extending in the axial direction is formed, and a rotor fixed to the rotating shaft. The oil passage is formed to expand toward the downstream side.

JP 2005-6429 A JP 2008-178243 A JP-A-9-182375 Japanese Utility Model Publication No. 6-48355 JP 2006-300101 A

  In the rotating electrical machine described in JP-A-2005-6429, the inner surface of the rotor core into which the rotating shaft is inserted is cooled, but it is difficult to cool the rotor core.

  In the motor described in Japanese Patent Laid-Open No. 2008-178243, the magnet cooling oil passage is connected to an oil passage formed in the shaft, and a radial oil passage extending in the radial direction in the rotor and a shaft in the rotor. And an axial oil passage extending in the direction and connected to the oil hole.

  The cooling oil is pushed from the radial passage into the axial passage by the pressure received from the oil pump. For this reason, the oil pump needs to generate power for pushing the cooling oil from the radial passage into the axial oil passage, and there has been a problem that the oil pump becomes large.

  In the motor described in Japanese Patent Application Laid-Open No. 9-182375, the oil tends to stay in the axial oil passage, and the oil does not easily flow through the rotor. And in order to ensure the fluidity | distribution of oil, the said supply means needs to generate | occur | produce big motive power.

  In the rotating electrical machine described in Japanese Utility Model Publication No. Hei 6-48355, the inclination angle of the air holes is small, air hardly flows through the air holes, and it is difficult to sufficiently cool the rotor.

  In the rotating electrical machine described in Japanese Patent Laid-Open No. 2006-30010, the oil passage reaches the end of the rotating shaft, and an opening is formed at the end of the rotating shaft. For this reason, the oil flowing in the oil passage flows only in the rotary shaft and hardly contributes to cooling of the rotor.

  The present invention has been made in view of the problems as described above, and an object of the present invention is to cool the inside of the rotor and suppress the increase in size of the pump, while suppressing the flow of the refrigerant in the rotor. It is to provide a rotating electrical machine that is secured.

  In the rotating electrical machine according to the present invention, a first refrigerant passage through which a refrigerant can flow is formed inside, a rotating shaft provided rotatably around a rotation axis, a first end face arranged in the direction of the rotation axis, and a second A rotor including an end face and fixed to the rotating shaft. The rotor is formed at a position closer to the first end surface than the second end surface, is connected to the first refrigerant passage, and extends from the rotating shaft toward the outer peripheral surface of the rotor; The second refrigerant passage is connected to the first end surface side storage portion, which is formed at a position closer to the first end surface than the second end surface and can store the refrigerant, and to the first end surface side storage portion, An axial passage extending from the first end surface side storage portion toward the second end surface is formed.

  Preferably, the rotor includes a permanent magnet provided in a magnet insertion hole extending in the rotation axis direction, and the end surface on the first end surface side among the both end surfaces of the permanent magnet arranged in the rotation axis direction is the first end surface. Located in the side reservoir.

  Preferably, the rotor includes a permanent magnet provided in a magnet insertion hole extending in the rotation axis direction, and the axial passage is provided so as to pass through the magnet insertion hole.

  Preferably, when the magnet insertion hole is viewed in plan from the rotation axis direction, the magnet insertion hole is formed so as to go to the outer peripheral surface of the rotor or the inner side of the rotor as it goes to the circumferential direction of the rotor. When the magnet insertion hole and the permanent magnet are viewed in plan from the rotational axis direction, the permanent magnet is located at the center in the width direction of the magnet insertion hole, and the axial passage is the end of the permanent magnet located on the outer peripheral surface side of the rotor. It is provided at a position adjacent to the part.

  Preferably, the rotor is formed at a position closer to the second end surface than the first end surface, is connected to the first refrigerant passage, and extends from the rotating shaft toward the outer peripheral surface of the rotor; A second end face side storage section that is formed at a position closer to the second end face than the first end face, is connected to the third refrigerant passage and the axial passage, and can store the refrigerant; and a first end face side storage section To the first end surface, the first discharge passage capable of discharging the refrigerant outwardly from the first end surface, and the second end surface side reservoir, and to the second end surface, A second discharge passage that can discharge outward from the second end face is further formed. The first discharge passage is located on the radially inner side of the axial passage and the second discharge passage.

  Preferably, the rotor is formed at a position closer to the second end surface than the first end surface, is connected to the first refrigerant passage, and extends from the rotating shaft toward the outer peripheral surface of the rotor; And a second end face side storage portion that is connected to the third refrigerant passage and is closer to the second end face than the first end face and can store the refrigerant. Preferably, the axial passage connects the first end face side storage section and the second end face side storage section, and is inclined outward in the radial direction of the rotor from the second end face side toward the first end face side. Formed as follows.

  And the said rotor contains the permanent magnet provided in the magnet insertion hole extended in a rotating shaft direction, and the end surface by the side of a 2nd end surface among the both end surfaces of the permanent magnet arranged in a rotating shaft direction is a 2nd end surface side. Located in the reservoir. Preferably, the first end surface side storage portion and the second end surface side storage portion are formed in an annular shape around the rotation axis.

  According to the rotating electrical machine according to the present invention, the inside of the rotor can be cooled, and the flowability of the refrigerant in the rotor can be ensured while suppressing an increase in the size of the pump.

It is sectional drawing of the rotary electric machine 100 which concerns on Embodiment 1 of this invention. It is sectional drawing in the II-II line of FIG. FIG. 3 is a plan view showing magnet insertion holes 150 and 151, permanent magnets 160 and 161 shown in FIG. 2 and their surroundings. It is sectional drawing of the rotary electric machine 100 which concerns on Embodiment 2 of this invention. It is sectional drawing in the VV line shown in FIG. It is sectional drawing of the rotary electric machine 100 which concerns on Embodiment 3 of this invention. It is sectional drawing in the VII-VII line of FIG. It is sectional drawing in the VIII-VIII line of FIG. FIG. 6 is a plan view of the end surfaces of permanent magnets 160 and 161 located in the oil reservoir 131 as viewed in plan from the direction of the rotation axis O. FIG. 6 is a plan view of the end surfaces of permanent magnets 160 and 161 located in the oil reservoir 136 as viewed from the direction of the rotation axis O. It is sectional drawing of the rotary electric machine 100 which concerns on Embodiment 4 of this invention. It is sectional drawing in the XII-XII line | wire of FIG. FIG. 6 is a partial cross-sectional view showing a modified example of rotating electric machine 100.

A rotating electrical machine 100 according to the present embodiment will be described with reference to FIGS.
Note that in the embodiments described below, when referring to the number, amount, and the like, the scope of the present invention is not necessarily limited to the number, amount, and the like unless otherwise specified. In the following embodiments, each component is not necessarily essential for the present invention unless otherwise specified. In addition, when there are a plurality of embodiments below, it is planned from the beginning to appropriately combine the features of each embodiment unless otherwise specified.

(Embodiment 1)
FIG. 1 is a cross-sectional view of rotating electric machine 100 according to Embodiment 1 of the present invention. As shown in FIG. 1, a rotating electrical machine 100 includes a rotating shaft 110 having a first refrigerant passage 101 formed therein and being rotatable about a rotation axis O, and a rotor fixed to the rotating shaft 110. 120 and a stator 103 disposed around the rotor 120 and formed in an annular shape.

  The stator 103 includes a stator core 104 formed in an annular shape and a coil 102 attached to the stator teeth of the stator core 104.

  The rotating shaft 110 is formed in a hollow cylindrical shape and is rotatably supported by bearings 108 and 109. The rotation shaft 110 is formed in a cylindrical shape, and a first refrigerant passage 101 extending in the direction of the rotation axis O is formed inside the rotation shaft 110. The oil pump 170 supplies the refrigerant 180 to the first refrigerant passage 101. A radial passage 105 extending in the radial direction of the rotary shaft 110 is connected to the first refrigerant passage 101. The rotor 120 is formed in a cylindrical shape and includes an end surface 125 and an end surface 126 arranged in the direction of the rotation axis O.

  The rotor 120 is formed at a position closer to the end surface 125 than the end surface 126, and extends from the rotary shaft 110 toward the outer peripheral surface of the rotor 120, and is connected to the second refrigerant passage 130. It is formed at a position closer to the end surface 125 than the end surface 126, and is connected to the oil storage portion (first end surface side storage portion) 131 capable of storing the refrigerant and the oil storage portion 131, and from the oil storage portion 131 toward the end surface 126. And an axial passage 134 extending in the direction. The axial passage 134 reaches the end face 126, and a discharge port 135 is formed in the end face 126.

  The refrigerant 180 flows through the first refrigerant passage 101. While the rotary electric machine 100 is being driven, the rotary shaft 110 is rotating, and a part of the refrigerant 180 flowing in the first refrigerant passage 101 enters the radial passage 105 by centrifugal force.

  The refrigerant 180 that has entered the radial passage 105 further flows in the second refrigerant passage 130 by centrifugal force and enters the oil reservoir 131.

  The refrigerant 180 that has entered the oil reservoir 131 is pressed against the inner surface of the oil reservoir 131 outward in the radial direction by centrifugal force.

  The refrigerant 180 is sequentially supplied from the second refrigerant passage 130 into the oil reservoir 131, so that the refrigerant 180 is accumulated in the oil reservoir 131. The refrigerant 180 accumulated in the oil reservoir 131 is pressurized by centrifugal force. The pressurized refrigerant 180 enters the axial passage 134. Since the refrigerant 180 entering the axial passage 134 is pressurized by the centrifugal force, it flows well in the axial passage 134 and is discharged to the outside from the discharge port 135.

  Thus, according to rotating electric machine 100 according to the present embodiment, centrifugal force is used to push refrigerant 180 into axial passage 134 from oil reservoir 131, and the driving force required for oil pump 170 is obtained. It can be kept small.

  The axial passage 134 extends from the oil reservoir 131 toward the end face 126, and can cool the interior of the rotor 120 satisfactorily.

  Here, when the rotating electrical machine 100 is driven, the magnetic flux from the coil 102 passes through the interior of the rotor 120. At this time, the magnetic flux mainly passes the outer peripheral surface side of the rotor 120, and the temperature on the outer peripheral surface side of the rotor 120 tends to be high.

  The axial passage 134 is connected to the oil reservoir 131, and the oil reservoir 131 is connected to the end of the second refrigerant passage 130 that extends from the rotary shaft 110 in the radial direction. For this reason, the axial passage 134 is located on the outer peripheral surface side of the rotor 120, and cools the outer peripheral surface side of the rotor 120 well. And the refrigerant | coolant 180 discharged | emitted from the discharge port 135 is sprayed on the coil 102 of the stator 103, and cools the coil 102. FIG.

  Rotor 120 includes a rotor core 121 formed by laminating a plurality of electromagnetic steel plates, and an end plate 122 and an end plate 123 provided on an end surface of the rotor core 121.

  The second refrigerant passage 130 and the oil reservoir 131 are formed by the rotor core 121 and the end plate 123. Specifically, the oil reservoir 131 and the second refrigerant passage 130 are formed by the recess formed in the end plate 123 and the end surface of the rotor core 121.

  2 is a cross-sectional view taken along line II-II in FIG. As shown in FIG. 2, the rotor core 121 of the rotor 120 has a plurality of magnet insertion holes 150 and 151 extending in the direction of the rotation axis O. Permanent magnets (cooling target members) 160 and 161 are accommodated in the magnet insertion holes 150 and 151.

  And the end surface by the side of the oil storage part 131 is exposed in the oil storage part 131 among the both end surfaces of each permanent magnet 160,161 arranged in the rotation axis O direction.

  For this reason, the permanent magnets 160 and 161 are satisfactorily cooled by the refrigerant 180 stored in the oil storage unit 131.

  As shown in FIG. 1, the axial passage 134 includes a magnet cooling passage 133 that passes through the magnet insertion holes 150 and 151, and a discharge passage 132 that is connected to the magnet cooling passage 133 and reaches the discharge port 135. . Thereby, the permanent magnets 160 and 161 are cooled in the direction of the rotation axis O by the refrigerant 180 flowing through the magnet cooling passage 133.

  When the rotating electrical machine 100 is driven, the central portions in the longitudinal direction of the permanent magnets 160 and 161 become hot. Since the magnet cooling passage 133 extends from one end of the magnet insertion holes 150 and 151 to the other end, the longitudinal center portions of the permanent magnets 160 and 161 are also cooled well.

  Here, as shown in FIG. 2, the oil reservoir 131 is formed in an annular shape around the rotation axis O. For this reason, the refrigerant 180 in the oil reservoir 131 is evenly distributed in the circumferential direction of the rotor 120. Furthermore, since the second refrigerant passage 130 and the radial passage 105 are formed at equal intervals in the circumferential direction of the rotor 120, the distribution of the refrigerant 180 in the oil reservoir 131 is prevented from being biased. ing. A plurality of magnet insertion holes 150 and 151 are formed at intervals in the circumferential direction of the rotor 120, and a magnet cooling passage 133 is formed in each of the magnet insertion holes 150 and 151. For this reason, the refrigerant 180 enters the magnet cooling passage 133 evenly, and the permanent magnets 160 and 161 can be evenly cooled. The magnet cooling passages 133 are arranged on a virtual circle centered on the rotation axis O.

  FIG. 3 is a plan view showing the magnet insertion holes 150 and 151, the permanent magnets 160 and 161 shown in FIG. FIG. 3 is a plan view of the magnet insertion holes 150 and 151 from the direction of the rotation axis O. As shown in FIG. 3, the magnet insertion hole 150 is inclined toward the outer peripheral surface of the rotor 120 as it goes in the rotational direction (circumferential direction) P.

  On the other hand, the magnet insertion hole 151 is inclined so as to go inward of the rotor 120 as it goes in the rotation direction P. And the magnet insertion hole 150 and the magnet insertion hole 151 are arrange | positioned so that it may become a V shape when planarly viewed from the rotation axis O direction.

  When the rotating electrical machine 100 is driven, portions of the permanent magnets 160 and 161 that are close to the stator 103 are heated.

  The magnet cooling passage 133 is provided so as to be adjacent to an end portion of the end portions of the permanent magnets 160 and 161 located on the outer peripheral surface side of the rotor 120. For this reason, the part which becomes high among the permanent magnets 160 and 161 can be positively cooled.

  The magnet insertion holes 150 and 151 are filled with resins 152 and 153, and the permanent magnets 160 and 161 are fixed by the resins 152 and 153. The magnet cooling passage 133 is formed in the resins 152 and 153.

  Permanent magnets 160 and 161 are arranged in the center in the width direction of magnet insertion holes 150 and 151. In the space defined by the magnet insertion holes 150 and 151, a gap is formed in a portion adjacent to the outer periphery side of the rotor 120 with respect to the permanent magnets 160 and 161, and the magnet cooling passage 133 is disposed in this gap. Has been.

(Embodiment 2)
A rotating electrical machine 100 according to Embodiment 2 of the present invention will be described with reference to FIGS. 4 and 5. Of the configurations shown in FIGS. 4 and 5, the same configurations as those shown in FIGS. 1 to 3 are given the same reference numerals, and descriptions thereof are omitted.

  FIG. 4 is a cross-sectional view of rotating electric machine 100 according to Embodiment 2 of the present invention. As shown in FIG. 4, the rotor 120 of the rotating electrical machine 100 is formed with a third refrigerant passage 137 formed at a position closer to the end face 126 than to the end face 125.

  The third refrigerant passage 137 is connected to the radial passage 106 and is connected to the first refrigerant passage 101 via the radial passage 106. The third refrigerant passage 137 extends from the rotary shaft 110 toward the outer peripheral surface of the rotor 120. Further, the rotor 120 is formed with an oil reservoir 136 at a position closer to the end face 126 than the end face 125, and the third refrigerant passage 137 and the magnet cooling passage 133 are connected to the oil reservoir 136. ing.

  A discharge passage 138 is connected to the oil reservoir 131, and the discharge passage 138 reaches the end face 125. A discharge passage 132 is connected to the oil reservoir 136, and the discharge passage 132 reaches the end face 126.

  The discharge passage 138 is located radially inward from the magnet cooling passage 133 and the discharge passage 132. Since the discharge passage 138 is located on the radially inner side of the discharge passage 132, more oil 180 than the oil storage portion 136 is accumulated in the oil storage portion 131. For this reason, the refrigerant 180 accumulated in the oil reservoir 131 reaches the inner side in the radial direction of the rotor 120 more than the refrigerant 180 accumulated in the oil reservoir 136.

  For this reason, the centrifugal force applied to the refrigerant 180 accumulated in the oil reservoir 131 is larger than the centrifugal force applied to the refrigerant 180 accumulated in the oil reservoir 136.

  The discharge passage 138 is located radially inward from the magnet cooling passage 133 connecting the oil storage portion 131 and the oil storage portion 136. For this reason, the refrigerant 180 in the oil reservoir 131 to which a large pressure is applied passes through the magnet cooling passage 133 and enters the oil reservoir 136.

  That is, the refrigerant 180 naturally flows from the oil reservoir 131 to the oil reservoir 136 by causing a difference between the pressure of the refrigerant 180 in the oil reservoir 131 and the pressure in the refrigerant 180 in the oil reservoir 136. .

  Thus, by using the centrifugal force, the refrigerant 180 flows in the magnet cooling passage 133, so that the driving force required for the oil pump 170 can be kept small, and the oil pump 170 can be made compact.

  5 is a cross-sectional view taken along line VV shown in FIG. As shown in FIG. 5, the oil reservoir 136 is formed in an annular shape around the rotation axis O, and a plurality of discharge passages 132 are formed at intervals in the circumferential direction. The cooling passage 133 is arranged on a virtual circle centered on the rotation axis O.

  The end surfaces of the permanent magnets 160 and 161 on the oil storage part 136 side are exposed in the oil storage part 136. For this reason, the end surfaces of the permanent magnets 160 and 161 are cooled by the refrigerant 180 stored in the oil storage unit 136.

  Furthermore, by forming the oil storage portion 136 in an annular shape, it is possible to prevent the refrigerant 180 accumulated in the oil storage portion 136 from being biased, and the rotor 120 can be easily balanced.

  The radial passage 106 and the third refrigerant passage 137 are also formed at equal intervals in the circumferential direction. Thereby, it can suppress that the refrigerant | coolant 180 collected in the oil storage part 136 is biased according to a position. Note that the oil reservoir 136 and the oil reservoir 131 substantially coincide with each other when viewed from the direction of the rotation axis O.

(Embodiment 3)
A rotating electrical machine 100 according to Embodiment 3 of the present invention will be described with reference to FIGS. Of the configurations shown in FIGS. 6 to 10, the same configurations as those shown in FIGS. 1 to 5 are given the same reference numerals, and descriptions thereof are omitted.

  FIG. 6 is a cross-sectional view of rotating electric machine 100 according to Embodiment 3 of the present invention. As shown in FIG. 6, the rotor 120 includes a third refrigerant passage 137 and an oil storage portion 136 connected to the third refrigerant passage 137 and provided closer to the end face 126 than the end face 125. Has been.

  Further, the rotor 120 is formed with a magnet cooling passage 133 that connects the oil reservoir 131 and the oil reservoir 136. The magnet cooling passage 133 is formed so as to incline radially outward of the rotor 120 from the end face 126 side toward the end face 125 side.

  Note that a discharge passage 132 is connected to the oil reservoir 136, and the discharge passage 132 reaches the end face 126. Further, a discharge passage 138 is connected to the oil reservoir 131, and the discharge passage 138 reaches the end face 125.

  Here, the discharge passage 132 and the discharge passage 138 are arranged in the direction of the rotation axis O, and the distance between the discharge passage 132 and the rotation axis O and the distance between the discharge passage 138 and the rotation axis O are equal. .

  Here, when viewed in plan from the direction of the rotation axis O, the oil reservoir 131 and the oil reservoir 136 coincide with each other. Since the discharge passage 132 and the discharge passage 138 are arranged in the direction of the rotation axis O, the amount of the refrigerant 180 stored in the oil storage portion 131 and the amount of the refrigerant 180 stored in the oil storage portion 136. Is almost the same.

  Thereby, there is almost no difference between the centrifugal force applied to the refrigerant 180 accumulated in the oil reservoir 131 and the centrifugal force applied to the refrigerant 180 accumulated in the oil reservoir 136. On the other hand, the magnet cooling passage 133 is inclined outward in the radial direction of the rotor 120 from the oil reservoir 136 side toward the oil reservoir 131 side.

  When the rotor 120 rotates, centrifugal force is also applied to the refrigerant 180 in the magnet cooling passage 133. When centrifugal force is applied to the refrigerant 180 in the magnet cooling passage 133, the refrigerant 180 in the magnet cooling passage 133 is pressed by a portion located on the radially outer side of the inner wall surface of the magnet cooling passage 133.

  When the refrigerant 180 is pressed against the inner wall surface of the magnet cooling passage 133, the refrigerant 180 receives a reaction force from the inner wall surface of the magnet cooling passage 133. The direction in which the reaction force is applied is a direction perpendicular to the inner wall surface of the magnet cooling passage 133.

  Here, as described above, the magnet cooling passage 133 is formed so as to incline radially outward from the oil reservoir 136 side toward the oil reservoir 131 side. For this reason, the reaction force applied to the refrigerant 180 can be divided into a component force in the radial direction and a component force in the rotation axis O direction.

  The component force in the direction of the rotation axis O presses the refrigerant 180 toward the oil reservoir 131. For this reason, the refrigerant 180 in the magnet cooling passage 133 flows toward the oil reservoir 131.

  Then, the refrigerant 180 in the oil reservoir 136 passes through the magnet cooling passage 133 and is sequentially supplied to the oil reservoir 131.

  Thus, also in the rotating electrical machine 100 according to the third embodiment, the circulation of the refrigerant 180 in the magnet cooling passage 133 is ensured by utilizing the centrifugal force.

  For this reason, the driving force required for the oil pump 170 can be kept small, and the oil pump 170 is downsized.

  7 is a cross-sectional view taken along line VII-VII in FIG. 6, and FIG. 8 is a cross-sectional view taken along line VIII-VIII in FIG.

  As shown in FIGS. 7 and 8, the oil reservoir 131 and the oil reservoir 136 are both formed in an annular shape, and the magnet cooling passage 133 is formed in the magnet insertion holes 150 and 151. In addition, when the oil storage part 131 and the oil storage part 136 are planarly viewed from the rotation axis O direction, the oil storage part 131 and the oil storage part 136 coincide with each other.

  FIG. 9 is a plan view of the end surfaces of the permanent magnets 160 and 161 located in the oil reservoir 136 as viewed from the direction of the rotation axis O, and FIG. 10 is a plan view of the permanent magnets 160 and 161 located in the oil reservoir 131. It is the top view which planarly viewed the end surface of this from the rotation axis O direction.

  As shown in FIGS. 9 and 10, the opening of the magnet cooling passage 133 located in the oil reservoir 131 is located radially outward from the opening of the magnet cooling passage 133 located in the oil reservoir 136. is doing.

(Embodiment 4)
A rotating electrical machine 100 according to Embodiment 4 of the present invention will be described with reference to FIGS. 11 and 12. Of the configurations shown in FIGS. 11 and 12, the same or corresponding components as those shown in FIGS. 1 to 10 are designated by the same reference numerals and the description thereof may be omitted. is there.

  FIG. 11 is a cross-sectional view of rotating electric machine 100 according to Embodiment 4 of the present invention. A rotating electrical machine 100 shown in FIG. 11 is a squirrel-cage induction rotating electrical machine. The rotating electrical machine 100 includes a stator 103 and a rotor 120 that is rotatably provided in the stator 103.

  The rotor 120 has a rotor core 360 formed by laminating a plurality of electromagnetic steel plates, metal short-circuit rings 320 and 330 provided on the end face of the rotor core 360, and the rotor core 360, and both ends are short-circuited. And a plurality of copper bars (cooling target members) 310 connected to the rings 320 and 330. Further, the rotor 120 includes an end plate 122 provided on the short-circuit ring 320 and an end plate 123 provided on the short-circuit ring 330.

  The rotor 120 is formed with a second refrigerant passage 130, an oil reservoir 131 connected to the second refrigerant passage 130, and an axial passage 333 connected to the oil reservoir 131. The other end of the axial passage 333 is connected to the oil reservoir 136.

  A discharge passage 138 is connected to the oil reservoir 131, and the discharge passage 138 reaches the end face 125. A discharge passage 132 is connected to the oil reservoir 136, and the discharge passage 132 reaches the end face 126.

  The discharge passage 138 is located on the radially inner side of the discharge passage 132 and the axial passage 333. When viewed in plan from the direction of the rotation axis O, the oil storage portion 136 and the oil storage portion 131 rotate. It corresponds to the direction of the axis O.

  For this reason, like the rotary electric machine 100 according to the second embodiment, the refrigerant 180 flows from the oil reservoir 131 side toward the oil reservoir 136.

  12 is a cross-sectional view taken along line XII-XII in FIG. As shown in FIG. 12, a plurality of axial passages 333 are formed around the copper bar 310 at intervals.

  When the rotating electrical machine 100 is driven, a large amount of magnetic flux flows through the copper bar 310 and the copper bar 310 becomes hot. The axial passage 333 is defined by the inner peripheral surface of the rotor core 360 and the outer peripheral surface of the copper bar 310. For this reason, the refrigerant 180 flows through the axial passage 333, so that the refrigerant 180 directly cools the copper bar 310.

  As described above, the present invention is not limited to the IPM type rotary electric machine and the cage type induction rotary electric machine. For example, as shown in FIG. 13, the present invention can be applied to an SPM type rotary electric machine.

  In FIG. 13, the rotor of the SPM type rotating electrical machine includes a rotor core 460 and a permanent magnet 410 fixed to the outer peripheral surface of the rotor core 460. An axial passage 433 is formed on the back side of the permanent magnet 410.

  According to this SPM type rotating electrical machine, the refrigerant 180 flows through the axial passage 433, so that the permanent magnet 410 can be well cooled and the rotor core 460 can also be cooled.

  Although the embodiment of the present invention has been described above, it should be considered that the embodiment disclosed this time is illustrative and not restrictive in all respects. The scope of the present invention is defined by the terms of the claims, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims. Furthermore, the above numerical values are examples, and are not limited to the above numerical values and ranges.

  The present invention can be applied to a rotating electrical machine, and in particular, can be applied to a rotating electrical machine in which the rotor is cooled.

  DESCRIPTION OF SYMBOLS 100 Rotating electrical machine, 101 1st refrigerant path, 102 Coil, 103 Stator, 104 Stator core, 105, 106 Radial path, 108, 109 Bearing, 110 Rotating shaft, 120 Rotor, 121 Rotor core, 122, 123 End plate, 125, 126 End face, 130 Second refrigerant passage, 131, 136 Oil reservoir, 132, 138 Discharge passage, 133 Magnet cooling passage, 134 Axial passage, 135 Discharge port, 137 Third refrigerant passage, 150, 151 Magnet insertion hole, 152, 153 resin, 160, 161 permanent magnet, 170 oil pump, 180 refrigerant, O rotation axis, P rotation direction.

Claims (8)

A first refrigerant passage through which a refrigerant can flow is formed inside, and a rotary shaft provided rotatably around a rotation axis;
A rotor including a first end surface and a second end surface arranged in a rotation axis direction and fixed to the rotation shaft;
With
A second refrigerant formed in the rotor at a position closer to the first end surface than the second end surface is connected to the first refrigerant passage and extends from the rotating shaft toward the outer peripheral surface of the rotor. A passage,
A first end face-side reservoir that is connected to the second refrigerant passage, is formed at a position closer to the first end face than the second end face, and can store the refrigerant;
A rotating electrical machine formed with an axial passage connected to the first end face side reservoir and extending from the first end face side reservoir to the second end face. The rotor includes a permanent magnet provided in a magnet insertion hole extending in the rotation axis direction,
2. The rotating electrical machine according to claim 1, wherein among the both end faces of the permanent magnets arranged in the rotation axis direction, an end face on the first end face side is located in the first end face side storage section. The rotor includes a permanent magnet provided in a magnet insertion hole extending in the rotation axis direction,
The rotating electrical machine according to claim 1, wherein the axial passage is provided so as to pass through the magnet insertion hole. When the magnet insertion hole is viewed in plan from the rotation axis direction, the magnet insertion hole is formed to go to the outer peripheral surface of the rotor or the inner side of the rotor as it goes to the circumferential direction of the rotor,
When the magnet insertion hole and the permanent magnet are viewed in plan from the rotational axis direction, the permanent magnet is located at the center in the width direction of the magnet insertion hole,
4. The rotating electrical machine according to claim 2, wherein the axial passage is provided at a position adjacent to an end of the permanent magnet located on the outer peripheral surface side of the rotor. The rotor includes
A third refrigerant passage formed at a position closer to the second end surface than the first end surface, connected to the first refrigerant passage, and extending from the rotary shaft toward the outer peripheral surface of the rotor;
A second end face side reservoir that is formed at a position closer to the second end face than the first end face, is connected to the third refrigerant passage and the axial passage, and can store the refrigerant;
A first discharge passage that is connected to the first end face side storage section, reaches the first end face, and is capable of discharging the refrigerant outward from the first end face;
A second discharge passage that is connected to the second end face side storage section, reaches the second end face, and is capable of discharging the refrigerant outward from the second end face;
5. The rotating electrical machine according to claim 1, wherein the first discharge passage is located radially inward of the axial passage and the second discharge passage. The rotor is formed at a position closer to the second end surface than the first end surface, is connected to the first refrigerant passage, and extends from the rotary shaft toward the outer peripheral surface of the rotor. A passage,
A second end face side reservoir that is connected to the third refrigerant passage, is formed at a position closer to the second end face than the first end face, and can store the refrigerant;
Is further formed,
The axial passage connects the first end surface side storage portion and the second end surface side storage portion, and toward the radially outer side of the rotor as it goes from the second end surface side to the first end surface side. The rotating electrical machine according to claim 1, wherein the rotating electrical machine is formed to be inclined. The rotor includes a permanent magnet provided in a magnet insertion hole extending in the rotation axis direction,
7. The rotating electrical machine according to claim 5, wherein among the both end faces of the permanent magnets arranged in the rotation axis direction, the end face on the second end face side is located in the second end face side storage section.   The rotating electrical machine according to any one of claims 5 to 7, wherein the first end face side storage section and the second end face side storage section are formed in an annular shape around the rotation axis.

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