JP5168472B2 - Rotating electric machine - Google Patents

Rotating electric machine Download PDF

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Publication number
JP5168472B2
JP5168472B2 JP2008036327A JP2008036327A JP5168472B2 JP 5168472 B2 JP5168472 B2 JP 5168472B2 JP 2008036327 A JP2008036327 A JP 2008036327A JP 2008036327 A JP2008036327 A JP 2008036327A JP 5168472 B2 JP5168472 B2 JP 5168472B2
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liquid refrigerant
rotor
flow path
rotor core
refrigerant flow
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JP2009195089A (en
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洋一 斉藤
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株式会社豊田自動織機
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Description

  The present invention relates to a rotating electrical machine, and more particularly to a rotating electrical machine including a rotor cooling means.
  When the motor (electric motor) rotates at high speed, the eddy current loss of the rotor steel plate and the magnet increases, and the operating conditions are limited by heat due to the problem of thermal demagnetization of the magnet, so that the motor performance cannot be sufficiently exhibited.
  Conventionally, as a heat dissipation structure for a rotor of an induction motor used in an air conditioner or the like, a rotor made of laminated electromagnetic steel sheets has a plurality of through holes, and has a plurality of blade pieces on one side or both sides in the vicinity of the through holes. A structure has been proposed (see, for example, Patent Document 1). In this configuration, when the rotor rotates, the air in the induction motor circulates through the through hole, thereby reducing the temperature of the rotor and stator windings.
Also, in a rotating electrical machine having a rotor in which salient poles protruding in the radial direction of the rotating shaft have a rotor arranged in the circumferential direction, in order to lubricate a bearing that supports the rotating shaft of the rotor, and to cool the rotor and stator As shown in FIG. 6, there are some which operate in a state where a part of the rotor 50 is immersed in the lubricating oil in a state where it is accumulated at the bottom in the housing. When the rotor 50 rotates in such a state, the salient pole 51 stirs the lubricating oil, and a very large lubricating oil stirring resistance acts on the rotor 50. In view of this, the axial rotation end of the rotating shaft of the salient pole resisting surface that receives the resistance by the rotation of the rotor causes an axial outward flow in the lubricating oil hitting the rotating shaft. A structure in which an axial flow forming surface 52 inclined in the direction is formed has been proposed (see, for example, Patent Document 2). In this rotating electrical machine, the axially outward flow is formed in the lubricating oil in the slot, and the lubricating oil is discharged out of the slot, whereby the stirring resistance of the lubricating oil during the rotation of the rotor can be reduced.
JP 2006-42543 A JP 2007-166802 A
  However, as in Patent Document 1, in the configuration in which the air in the housing is circulated through the path passing through the through hole formed in the rotor, the effect of cooling the rotor is insufficient. Further, in the configuration of Patent Document 1, the through hole formed in the rotor is formed in parallel to the rotation axis, and the air is guided to the through hole by the action of the blade piece, so the circulation speed is low, The effect of cooling the rotor is insufficient.
  Further, in Patent Document 2, since the lubricating oil is used, the cooling effect is higher than that in Patent Document 1 in which the air in the housing is used. However, since there are a plurality of salient poles 51 on the outer peripheral surface of the rotor, when high speed rotation is performed, the rotational resistance increases, and an increase in size is inevitable in order to increase the output torque.
  The present invention has been made in view of the above problems, and its purpose is to stir liquid refrigerant with a configuration using gas as a refrigerant or a salient pole formed on the outer peripheral surface of a rotor core using liquid refrigerant. An object of the present invention is to provide a rotating electrical machine that can increase the heat dissipation effect of a rotor as compared with a configuration that uses a rotor that performs the same.
  In order to achieve the above object, the invention according to claim 1 is provided so as to penetrate the rotor core supported so as to be integrally rotatable with respect to the rotating shaft from the first end portion to the second end portion, and to exist inside. A rotor having a liquid refrigerant flow path provided so as to be inclined so as to assist the liquid refrigerant to be moved from the first end side toward the second end side when the rotor core rotates in the forward rotation direction. It is arranged inside. Here, “rotation in the forward rotation direction” means a rotation direction when the rotating electrical machine is driven in a normal state. For example, when a rotating electrical machine that can rotate forward and reverse is used for driving a vehicle. Is the direction of rotation during forward travel. Moreover, in the case of a rotating electrical machine that cannot rotate forward and reverse, the rotation direction is the forward rotation direction.
In the rotating electrical machine of the present invention, the rotor is cooled by the liquid refrigerant flowing in the liquid refrigerant flow path provided in the rotor core during driving. Therefore, the heat dissipation effect (cooling effect) of the rotor compared to a configuration using gas as a refrigerant or a configuration using a rotor that stirs liquid refrigerant with salient poles formed on the outer peripheral surface of the rotor core using liquid refrigerant. Can be high.
In the first aspect of the invention, the rotor core may include a guide piece that faces the first end of the liquid refrigerant flow path and guides the liquid refrigerant toward the liquid refrigerant flow path. It is provided in a state protruding from the end face. Therefore, in the present invention, the liquid refrigerant can be easily supplied from the outside of the rotor core to the liquid refrigerant flow path.
Further, in the first aspect of the present invention, there is a retention portion in which the liquid refrigerant flowing out of the liquid refrigerant flow path temporarily stays at the bottom of the housing that houses the stator and the rotor, and the retention portion The existing liquid refrigerant is pumped up by a pump and supplied from the nozzle to the guide piece. In this invention, compared with the configuration in which the liquid refrigerant is supplied to the liquid refrigerant flow path simply by rotating in a state where the first end of the liquid refrigerant flow path is immersed in the liquid refrigerant retention portion, the liquid refrigerant is supplied to the liquid refrigerant flow path. It can be supplied efficiently.
  According to a second aspect of the present invention, in the first aspect of the present invention, the rotor has a permanent magnet embedded in the rotor core, and a flux barrier is formed on the outer peripheral side of the rotor core from the permanent magnet. The liquid refrigerant flow path is formed in the barrier. In general, the rotor core is formed by laminating a plurality of electromagnetic steel plates, and it takes time to provide the electromagnetic steel plates with the liquid refrigerant flow path inclined. However, in the present invention, since the liquid refrigerant flow path is provided in the flux barrier, the liquid refrigerant flow path can be easily formed as compared with the case where the liquid refrigerant flow path is directly processed on the magnetic steel sheet.
  According to the present invention, the heat dissipating effect of the rotor compared to the configuration using gas as the refrigerant and the configuration using the rotor that stirs the liquid refrigerant with salient poles formed on the outer peripheral surface of the rotor core using the liquid refrigerant. Can be high.
  Hereinafter, an embodiment in which the present invention is embodied in an electric motor will be described with reference to FIGS. 1 and 2. FIG. 1A is a schematic cross-sectional view of a rotating electrical machine, FIG. 1B is a schematic front view seen from the rotor second end (left end of FIG. 1A), and FIG. It is the elements on larger scale of FIG.1 (b).
  As shown in FIG. 1A, an electric motor 10 as a rotating electrical machine has a housing 11 composed of a substantially cylindrical main body portion 11a and a lid portion 11b covering the opening, and the inner peripheral surface of the housing 11 In addition, a stator (stator) 12 is fixed. The stator 12 is cylindrical and a plurality of teeth 13 are provided at equal intervals on the inside. A coil (winding) 14 is wound around the teeth 13. Note that only the coil end of the coil 14 is shown. The winding method of the coil 14 may be distributed winding or concentrated winding.
  A rotor (rotor) 15 is disposed inside the stator 12. The rotor 15 includes a rotor core 16 in which a plurality of disk-shaped electromagnetic steel plates 16 a made of a high permeability material such as an electromagnetic steel plate are stacked and a disk-shaped end plate 17 is provided at both ends. And a rotating shaft 18 inserted through the center. The electromagnetic steel plates 16a and the end plate 17 are integrally fixed with an adhesive or the like as necessary. The rotating shaft 18 is supported so as to be rotatable with respect to the housing 11 via a bearing 19 that is fixed to the approximate center of both the lid portions 11 b of the housing 11.
  As shown in FIG. 1B, the rotor core 16 has a permanent magnet 20 embedded in each virtual region equally divided into a plurality (four in this embodiment) in the circumferential direction. Each permanent magnet 20 is formed in an arc shape in cross section, and is embedded in a state of being mounted in a mounting hole 21 formed so as to protrude toward the center side of the rotor core 16. The permanent magnets 20 are magnetized so that the magnetization direction is the thickness direction, and the permanent magnets 20 arranged in adjacent virtual regions are arranged so that the outer peripheral side of the rotor core 16 has different poles. ing. In addition, illustration of the end plate 17 is abbreviate | omitted in FIG.1 (b).
  A flux barrier 22 is formed in the electromagnetic steel plate 16a portion of the rotor core 16 on the outer peripheral side from the position where the permanent magnet 20 is embedded. In the flux barrier 22, the liquid pipe 24 constituting the liquid refrigerant flow path 23 penetrates the rotor core 16 from the first end portion to the second end portion, and the liquid refrigerant present in the rotor core 16 is in the rotor core 16. It is embedded in an inclined state so as to assist in moving from the first end side (the right end in FIG. 1A) toward the second end side during rotation in the forward rotation direction. More specifically, as shown in FIG. 1C, the metal pipe 24 has a first end side on the front side in the rotational direction of the rotor core 16 from the second end side in a plane orthogonal to the radial direction of the rotor core 16. Are arranged as follows. The flux barrier 22 is filled with a filler 25 made of an electrically insulating material having high thermal conductivity in order to fill the metal pipe 24. As the filler 25, for example, a resin having high thermal conductivity is used. As the resin having high thermal conductivity, a resin in which ceramic particles or glass fibers are mixed with a resin that does not soften at the heat generation temperature when the electric motor 10 is driven is used. For example, an epoxy resin mixed with silicon nitride particles or glass fibers can be used.
  On both end plates 17, a flow path 23 a that communicates with the hole of the metal pipe 24 and forms a part of the liquid refrigerant flow path 23 is formed at a position facing the end of the metal pipe 24. One end plate 17 provided on the first end portion side of the metal pipe 24 faces the flow path 23a, that is, faces the first end of the liquid refrigerant flow path 23, and transfers the liquid refrigerant to the liquid refrigerant flow path. A guide piece 26 is provided so as to project inward from the end face of the end plate 17. The guide piece 26 is formed in a substantially bowl shape, and is disposed so that the concave portion faces the open end of the liquid refrigerant channel 23.
  As shown in FIG. 1 (a), at the bottom of the housing 11, there is a staying portion 27 in which the liquid refrigerant flowing out from the liquid refrigerant flow channel 23 temporarily stays. The staying part 27 is composed of two recessed parts 27a formed at both ends of the bottom part of the main body part 11a, and a communication passage 27b that allows the two recessed parts 27a to communicate with each other. Further, as shown in FIG. 1A, when the rotor 15 rotates in the positive direction (the clockwise direction in FIG. 1B, that is, the direction of the arrow in FIG. 1B), the guide piece 26 A nozzle 28 for supplying the liquid refrigerant is provided so as to receive the liquid refrigerant. In the present embodiment, the nozzle 28 is provided so as to supply the liquid refrigerant to a position corresponding to the lowermost part of the rotor 15, and the nozzle 28 discharges the liquid refrigerant from top to bottom.
  A pump 29 driven by the rotary shaft 18 is provided outside the housing 11, a suction port 29 a of the pump 29 is connected to a conduit 30 for sucking liquid refrigerant existing in the staying portion 27, and a discharge port 29 b is connected to the nozzle 28. It connects with the pipe line 31 which supplies a liquid refrigerant. Pipes are used as the conduits 30 and 31, and the conduits 30 and 31 are arranged in a state where a part thereof passes outside the housing 11. Then, the liquid refrigerant existing in the staying portion 27 is pumped up by the pump 29 and supplied from the nozzle 28 to the guide piece 26. For example, ATF (Automatic Transmission Fluid) oil is used as the liquid refrigerant.
  The holes constituting the flux barrier 22 are formed simultaneously with the mounting holes 21 when each electromagnetic steel sheet 16a is formed by press working. Then, the metal pipe 24 is disposed in an inclined state in the flux barrier 22 formed by laminating and fixing a predetermined number of electromagnetic steel plates 16a, and the liquid refrigerant flow path is filled with a filler 25 around the metal pipe 24. 23 is formed. Accordingly, the liquid refrigerant flow path 23 is formed in the rotor core 16 formed by laminating the plurality of electromagnetic steel plates 16a as compared with the case where the liquid refrigerant flow path 23 is provided directly in an inclined state instead of in the flux barrier. It becomes easy.
Next, the operation of the electric motor 10 configured as described above will be described.
When the electric motor is driven in a load state, a current is supplied to the coil 14 of the stator 12 to generate a rotating magnetic field in the stator 12 and a rotating magnetic field acts on the rotor 15. Then, the rotor 15 rotates in synchronization with the rotating magnetic field by the magnetic attractive force and the repulsive force between the rotating magnetic field and the permanent magnet 20.
  When the rotor 15 rotates at a high speed, a change in the interlinkage magnetic flux acting on the rotor 15 during rotation increases, and an eddy current is generated in the rotor 15. Since the electromagnetic steel plate 16a exists around the permanent magnet 20, eddy currents are generated most frequently inside the electromagnetic steel plate 16a. And the loss by an eddy current generate | occur | produces in the electromagnetic steel plate 16a, and the electromagnetic steel plate 16a heat | fever-generates. The heat generated in the electromagnetic steel plate 16a is dissipated through the periphery of the electromagnetic steel plate 16a or through the end plate 17 in contact with the electromagnetic steel plate 16a.
  Further, when the electric motor 10 is driven, the pump 29 is also driven, and the liquid refrigerant existing in the staying portion 27 is pumped up from the staying portion 27 via the conduit 30 and discharged from the outlet 29b of the pump 29 to the conduit 31. And is ejected downward from the nozzle 28. Then, when the guide piece 26 provided on the first end side of the rotor core 16 passes below the nozzle 28, the liquid refrigerant ejected from the nozzle 28 is guided by the guide piece 26 and the liquid refrigerant flow path 23. It flows into the liquid refrigerant channel 23 from the first end. The liquid refrigerant that has flowed into the liquid refrigerant flow path 23 flows in the liquid refrigerant flow path 23 from the first end side toward the second end part as the rotor 15 rotates, and flows out from the second end part. To do. Then, the liquid refrigerant flows through the liquid refrigerant flow path 23 in the rotor core 16, thereby cooling the rotor core 16.
According to this embodiment, the following effects can be obtained.
(1) In the electric motor 10, the liquid refrigerant present inside the rotor core 16 rotates so as to penetrate the rotor core 16 supported so as to be integrally rotatable with respect to the rotating shaft 18 from the first end portion to the second end portion. A rotor 15 having a liquid refrigerant flow path 23 provided at an angle so as to assist sometimes from the first end side toward the second end side is disposed inside the stator 12. Accordingly, during driving, the rotor 15 is cooled by the liquid refrigerant flowing in the liquid refrigerant flow path 23 provided in the rotor core 16, so the configuration using gas as the refrigerant or the outer periphery of the rotor core using the liquid refrigerant The heat dissipation effect (cooling effect) of the rotor can be enhanced compared to a configuration using a rotor that stirs liquid refrigerant with salient poles formed on the surface.
  (2) In the rotor 15, the permanent magnet 20 is embedded in the rotor core 16, the flux barrier 22 is formed on the outer peripheral side of the rotor core 16 from the permanent magnet 20, and the liquid refrigerant flow path 23 is formed in the flux barrier 22. Yes. Accordingly, the liquid refrigerant flow path 23 is formed in the rotor core 16 formed by laminating the plurality of electromagnetic steel plates 16a as compared with the case where the liquid refrigerant flow path 23 is provided directly in an inclined state instead of in the flux barrier. It becomes easy.
  (3) The rotor core 16 has a guide piece 26 that faces the first end of the liquid refrigerant flow path 23 and guides the liquid refrigerant toward the liquid refrigerant flow path 23, that is, the end face of the end plate 17, that is, the rotor core. 16 are provided so as to protrude from the end face of 16. Therefore, the liquid refrigerant can be easily supplied from the outside of the rotor core 16 to the liquid refrigerant channel 23.
  (4) At the bottom of the housing 11 that houses the stator 12 and the rotor 15, there is a staying portion 27 in which the liquid refrigerant flowing out from the liquid refrigerant flow path 23 temporarily stays, and the liquid refrigerant present in the staying portion 27 is pumped. It is pumped up at 29 and supplied from the nozzle 28 to the guide piece 26. Therefore, compared with the configuration in which the liquid refrigerant is supplied to the liquid refrigerant channel 23 simply by rotating in a state where the first end of the liquid refrigerant channel 23 is immersed in the liquid refrigerant retention portion 27, the liquid refrigerant is supplied to the liquid refrigerant channel 23. 23 can be efficiently supplied.
  (5) The liquid refrigerant pumped up by the pump 29 from the staying part 27 reaches the pump 29 through a pipe line 30 arranged so that a part thereof passes through the outside of the housing 11, and a part of the liquid refrigerant passes through the outside of the housing 11. It is supplied to the nozzle 28 via a pipe line 31 arranged to pass through. Therefore, as compared with the configuration in which the pipes 30 and 31 are provided in the housing 11, the liquid refrigerant is more cooled by heat dissipation while passing through the pipes 30 and 31 and supplied to the liquid refrigerant flow path 23. The temperature of the refrigerant is lowered, and the cooling effect of the rotor 15 by the liquid refrigerant is improved.
  (6) The rotor 15 is not immersed in the liquid refrigerant, but is cooled by the liquid refrigerant supplied from the nozzle 28 flowing through the liquid refrigerant flow path 23. Therefore, compared to a configuration in which a protrusion extending in the axial direction is provided on the outer peripheral surface of the rotor, and cooling is performed by placing the rotor partly immersed in the liquid refrigerant and stirring the liquid refrigerant. The resistance when the rotor 15 rotates is reduced. Therefore, the output torque at the same power consumption can be increased, and when the output torque during high-speed rotation is set to be the same, the electric motor 10 can be reduced in size.
  (7) The liquid refrigerant flow path 23 provided in the portion of the electromagnetic steel plate 16a is constituted by the metal pipe 24, and around the metal pipe 24 is a ceramic particle or resin that is not softened by the heat generation temperature when the electric motor 10 is driven. A mixture of glass fibers is used. Therefore, the metal pipe 24 and the filler 25 contribute to improving the strength of the rotor 15 as compared with the configuration in which the rotor core 16 is simply provided with the flux barrier 22.
  (8) The nozzle 28 is disposed at a position corresponding to the lowermost part of the rotor 15 and discharges the liquid refrigerant from the top to the bottom so that the guide piece 26 can receive the liquid refrigerant. Therefore, the force by which the liquid refrigerant acts on the guide piece 26 does not hinder the rotation.
The embodiment is not limited to the above, and may be embodied as follows, for example.
O It is good also as a structure arrange | positioned in the state in which a part of rotor 15 is immersed in a liquid refrigerant. For example, as shown in FIG. 3, the staying portion 27 does not include the recess 27 a and the communication path 27 b, and the bottom portion side of the housing 11 constitutes the staying portion 27. The liquid refrigerant is stored so that the first end of the liquid refrigerant flow path 23 can pass through the liquid refrigerant when the rotor 15 rotates. Nozzle 28 and pump 29 are not provided. When the first end portion of the liquid refrigerant flow path 23 passes through the staying portion 27, the guide piece 26 causes the liquid refrigerant staying in the staying portion 27 to flow toward the first end portion of the liquid refrigerant flow path 23. It is provided in such a direction. In this configuration, the nozzle 28, the pump 29, and the conduits 30 and 31 are not necessary, and the structure is simplified. Further, since a part of the rotor 15 is always in a state of stirring the liquid refrigerant, the rotor 15 is also cooled from the outside. Although the rotor 15 is in a state of stirring the liquid refrigerant in the staying portion 27, the stirring resistance is smaller than the configuration in which the rotor 15 is stirred at the protrusion formed on the outer peripheral surface of the rotor 15.
  In the case of a configuration in which a part of the rotor 15 is immersed in the liquid refrigerant, instead of the configuration in which the guide piece 26 protrudes from the end surface of the end plate 17, as shown in FIGS. In addition, a recess 32 is formed in the end plate 17 provided on the first end portion side of the rotor core 16 with the end portion of the metal pipe 24 exposed. The concave portion 32 is shaped so that the liquid refrigerant can easily flow into the metal pipe 24 when the concave portion 32 is immersed in the liquid refrigerant and moves in the normal rotation direction of the rotor 15 (the arrow direction in the figure). In this case, manufacture becomes easier as compared with the configuration in which the guide piece 26 is provided on the end plate 17. Further, the resistance when the rotor 15 rotates is smaller than the configuration in which the guide piece 26 protrudes from the end plate 17.
  In the case where the rotor 15 is arranged so that a part of the rotor 15 is immersed in the liquid refrigerant, the liquid refrigerant is guided to the liquid refrigerant flow path 23 when the rotor 15 rotates reversely to the end plate 17 on the second end side. The guide piece 26 may be provided as described above. In this case, cooling is possible even when reversely rotating.
  In the configuration in which the guide piece 26 is provided so as to protrude from the end face of the end plate 17, the flow path 23 a corresponding to the guide piece 26 is formed in a tapered shape with a diameter decreasing toward the first end of the metal pipe 24. May be. In this case, the liquid refrigerant can easily flow into the metal pipe 24 as compared with the case where the flow path 23a has a constant diameter.
In the embodiment, the guide piece 26 has a substantially bowl shape, but is not limited to this shape. Any shape may be used as long as the liquid refrigerant is guided to the liquid refrigerant flow path 23, for example, a quadrangular shape.
The inclination direction of the liquid refrigerant passage 23 penetrating from the first end portion to the second end portion of the rotor core 16 is such that the liquid refrigerant present in the liquid refrigerant passage 23 rotates when the rotor core 16 rotates in the forward rotation direction. The direction may be any direction that assists from the first end side toward the second end side, and is provided so as to be inclined in the radial direction of the rotor core 16 and further away from the rotation shaft 18 toward the second end side. May be. In this configuration, the farther away from the rotating shaft 18, the larger the centrifugal force is received, and thus the liquid refrigerant is likely to move outward, that is, to the second end side.
In the configuration in which the liquid refrigerant is supplied from the nozzle 28, the position of the nozzle 28 may be a position where the liquid refrigerant can be injected to the guide piece 26 that moves obliquely upward.
In the configuration in which the liquid refrigerant is supplied from the nozzle 28, the liquid refrigerant injection direction may be parallel to the direction in which the rotating shaft 18 extends instead of downward. In this case, since the injected liquid refrigerant flows directly into the first end (inlet) of the liquid refrigerant flow path 23, the guide piece 26 can be omitted.
  The rotor core 16 is not limited to the configuration including the end plates 17 at both ends of the electromagnetic steel plate 16a. For example, the end plates 17 on both sides may be eliminated, and the guide piece 26 may protrude from the end surface of the electromagnetic steel plate 16a. Also, in the case where the nozzle 28 is configured to inject liquid refrigerant in the direction in which the rotating shaft 18 extends, the end plates 17 on both sides may be omitted.
  In the configuration in which the rotor 15 rotates without providing the nozzle 28 and the guide piece 26 and a part of the rotor core 16 is immersed in the liquid refrigerant, the end plate 17 on the inlet side of the liquid refrigerant flow path 23 has the liquid refrigerant. However, the end plate 17 on the outlet side of the liquid refrigerant channel 23 may be omitted.
  The pump 29 may be provided in the housing 11. Even when the pump 29 is provided in the housing 11, it is preferable to arrange the pipes 30 and 31 so that a part of the pipes 30 and 31 passes outside the housing 11.
  (Circle) the pipe line 31 may be branched and the nozzle 28 may be provided in the front-end | tip of each branch part. In this case, since the liquid refrigerant is supplied to each liquid refrigerant flow path 23 from the nozzle 28 a plurality of times during one rotation of the rotor 15, the liquid refrigerant injected from the nozzle 28 is more efficiently flowed into the liquid refrigerant flow. Supplyed to the path 23.
  ○ The outer shape of the rotor core 16 is not limited to a circle. For example, as shown in FIG. 5, a recess 33 may be provided on the outer peripheral edge corresponding to the flux barrier 22 of the rotor core 16. In this case, the gap between the stator 12 and the rotor 15 is increased at the concave portion 33, and the reluctance is also increased, so that the output torque at the same current increases. Since the recess 33 is not provided in order to enhance the stirring effect of the liquid refrigerant, it can be formed in a state where the rotational resistance is small.
  The flux barrier 22 only needs to be formed so as to be convex toward the center of the rotor 15, and the shape of the flux barrier 22 is not limited to an arc shape. For example, the arc portion may be continuous on both sides of the linear portion, or the portion continuous on both sides of the linear portion may be linear.
  ○ The permanent magnet 20 is not limited to one pole. For example, instead of providing one arc-shaped permanent magnet 20, two flat permanent magnets 20 may be arranged in a V shape, or one flat plate. The plate-like permanent magnets 20 may be arranged in a state orthogonal to the radial direction, and the plate-like permanent magnets 20 may be arranged on both sides thereof so as to extend obliquely toward the outer peripheral side.
Depending on the size of the rotor core 16, a plurality of layers of permanent magnets 20 may be provided so as to protrude toward the center of the rotor core 16.
The number of poles of the rotor 15 is not limited to four but may be an even number, but four or more are preferable, and are appropriately set according to the size of the rotor 15.
The electric motor 10 is not limited to an embedded magnet type or a surface magnet type permanent magnet type electric motor, but may be applied to, for example, an induction motor or a reluctance electric motor.
○ It may be applied not only to motors but also to generators.
The following technical idea (invention) can be understood from the embodiment.
(1) pre-Symbol pump is driven by the rotation shaft of the rotor, the inlet of the pump is connected to the conduit for drawing the liquid refrigerant present in the bottom of the housing, the discharge port for supplying the liquid refrigerant to the nozzle It is connected to the pipeline.
(2) pre-Symbol rotor is rotated while partially immersed in the liquid refrigerant.
(3) pre-Symbol fluid coolant channel together is formed by a metal pipe, having high thermal conductivity electrical insulation in the gap between the rotor core is filled.
(A) is a schematic cross section of a rotating electrical machine, (b) is a schematic front view of a rotor, and (c) is a partially enlarged view of (b). The model perspective view of a guide piece. The schematic cross section of the rotary electric machine of another embodiment. (A) is the partial schematic diagram of the rotor in another embodiment, (b) is the BB sectional drawing of (a). The schematic front view which shows the half of the rotor in another embodiment. The fragmentary sectional view of a prior art.
Explanation of symbols
  DESCRIPTION OF SYMBOLS 11 ... Housing, 12 ... Stator, 15 ... Rotor, 16 ... Rotor core, 18 ... Rotating shaft, 20 ... Permanent magnet, 22 ... Flux barrier, 23 ... Liquid refrigerant flow path, 26 ... Guide piece, 27 ... Retention part, 28 ... Nozzle, 29 ... Pump.

Claims (2)

  1. The first end portion passes through the rotor core supported so as to be integrally rotatable with respect to the rotation shaft from the first end portion to the second end portion, and the liquid refrigerant existing inside rotates in the forward rotation direction of the rotor core. A rotor having a liquid refrigerant flow path provided so as to be inclined toward the second end side from the side, is a rotating electrical machine disposed inside the stator ,
    The rotor core is provided with a guide piece that faces the first end of the liquid refrigerant flow path and guides the liquid refrigerant toward the liquid refrigerant flow path so as to protrude from the end face of the rotor core,
    At the bottom of the housing that houses the stator and the rotor, there is a staying part in which the liquid refrigerant flowing out from the liquid refrigerant channel temporarily stays, and the liquid refrigerant present in the staying part is pumped up by a pump, A rotating electric machine, wherein the rotating electric machine is supplied from a nozzle to the guide piece .
  2.   2. The rotor according to claim 1, wherein a permanent magnet is embedded in the rotor core, a flux barrier is formed on an outer peripheral side of the rotor core from the permanent magnet, and the liquid refrigerant flow path is formed in the flux barrier. Rotating electric machine.
JP2008036327A 2008-02-18 2008-02-18 Rotating electric machine Expired - Fee Related JP5168472B2 (en)

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JP2011254573A (en) * 2010-05-31 2011-12-15 Aisin Seiki Co Ltd Rotor of rotating electrical machine
WO2012000544A1 (en) 2010-06-30 2012-01-05 Abb Research Ltd Synchronous reluctance machine using rotor flux barriers as cooling channels
JP2013183480A (en) * 2012-02-29 2013-09-12 Toyota Motor Corp Cooling structure of rotor for rotary electric machine and rotary electric machine
JP6655598B2 (en) 2017-12-28 2020-02-26 本田技研工業株式会社 Rotating electric machine rotor
KR102006189B1 (en) * 2018-01-12 2019-08-01 엘지전자 주식회사 Motor for electric vehicle

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