JP5590385B2 - Rotating electric machine - Google Patents

Description

  The present invention includes a rotor provided with a refrigerant flow path that is pivotally supported on a case by a rotation shaft and penetrates in a direction along the axis of the rotation shaft, and a stator that is disposed radially outside the rotor and is fixed to the case. The present invention relates to a rotating electrical machine provided.

  Patent Document 1 discloses a rotating electrical machine that suppresses deterioration and damage of a coil end due to a collision of cooling oil scattered from a rotor. The rotating electrical machine includes a guide path connected to a first discharge port formed on the outer surface of the end plate of the rotor, and a second branched from the guide path and formed radially inward from the first discharge port. And a branch path connected to the discharge port. The passage resistance, passage diameter, and the like of the guide path are appropriately designed in advance, and when excess refrigerant exceeding the discharge limit of the first discharge port is introduced into the guide path, the second discharge port is provided via the branch path. It is configured to discharge this from. The refrigerant discharged from the second discharge port is received by a partition provided in the housing and does not collide with the coil end. Therefore, even when the centrifugal force increases during the high-speed rotation of the rotor, it is possible to avoid an excessive amount of refrigerant from colliding with the coil end, and attack of the refrigerant discharged from the first discharge port against the coil end. Sexuality can be reduced.

JP 2010-45894 A

  However, in the rotating electrical machine, only the amount of refrigerant discharged from the first discharge port is limited, and it is inevitable that the refrigerant discharged from the rotor collides with the coil end. Therefore, when the rotational speed of the rotor is very high, the centrifugal force acting on the refrigerant discharged from the first discharge port becomes excessive, and the coil end may be deteriorated or damaged.

  The present invention has been made in view of the above problems, and provides a rotating electrical machine capable of preventing a refrigerant discharged from a refrigerant flow path formed in a rotor from colliding with a coil end of a coil provided in a stator. The purpose is to provide.

FEATURES configuration of the rotating electric machine according to the present invention, is supported on the case by the rotating shaft, a rotor provided with a refrigerant flow path which penetrates in the direction along the axis of the rotary shaft, located radially outwardly of the rotor The refrigerant discharged from the discharge port between the stator fixed to the case, the discharge port of the refrigerant flow path formed in the rotor, and the coil end of the coil provided in the stator. And a regulating member having an annular wall portion that prevents the coil end from colliding with the coil end, and the wall portion is provided on an end surface of the rotor, and the tip of the wall portion is the tip of the coil end. The wall portion is formed so that the diameter of the inner peripheral surface of the wall portion increases toward the tip end side .

If a regulating member having an annular wall portion is provided between the outlet of the refrigerant flow path and the coil end as in this feature configuration, the refrigerant discharged from the outlet receives a centrifugal force and is radially outward. When it is scattered, it collides with the wall portion of the regulating member even if it is scattered at any position in the circumferential direction, so that it is possible to prevent the refrigerant from directly colliding with the coil end. Since such an effect can be obtained even when the rotational speed of the rotor is high, the coil end can be protected even during high-speed rotation. The restricting member may be provided in any of the rotor, the stator, and the case, and the annular shape is not limited to the annular shape as long as the shape surrounds the discharge port.
Moreover, since the tip of the wall portion protrudes from the tip of the coil end, even if the refrigerant discharged from the discharge port is scattered radially outward from the tip of the wall portion by centrifugal force, it does not collide with the coil end. Furthermore, the inner peripheral surface of the wall portion can be tapered, for example, with a diameter increasing toward the tip side. Then, when the refrigerant moves along the inner peripheral surface of the wall portion, a speed component in the tip direction is generated in the refrigerant due to the component in the direction along the tapered surface of the centrifugal force. As a result, when the refrigerant is discharged from the discharge port, the tip direction component can be included in the discharge direction, so that the refrigerant can be more reliably prevented from colliding with the coil end. In addition, according to the present feature configuration, the height of the wall portion can be reduced, so that the restriction member can be reduced in weight, size, and cost.

The characteristic configuration of the present invention resides in that, in the outer peripheral surface of the wall portion, a region where the diameter on the proximal end side is smaller than the diameter on the distal end side is provided in a region closer to the distal end than the distal end of the coil end. .

  For example, when the rotor rotates at a low speed, the centrifugal force acting on the refrigerant discharged from the discharge port is small, and the refrigerant reaches the outer peripheral surface from the inner peripheral surface of the wall portion via the tip, and reaches the outer peripheral surface. Along the rotor side. If the refrigerant moves along the outer peripheral surface of the wall to the area where it overlaps with the coil end, then the refrigerant adhering to the outer peripheral surface of the wall when the rotational speed of the rotor increases becomes a coil end. There is a risk of collision. According to this characteristic configuration, the refrigerant adhering to the outer peripheral surface of the wall portion is likely to scatter radially outward at a portion where the diameter on the base end side is smaller than the diameter on the tip end side, and the refrigerant is at the coil end. It can suppress moving to the area | region which overlaps with the outer peripheral surface of a wall part.

The characteristic configuration of the present invention is that a fin protruding inward is provided in a region of the inner peripheral surface of the case where the refrigerant discharged from the discharge port collides.

  According to this characteristic configuration, the refrigerant whose temperature has been increased when the magnet in the rotor is cooled comes into contact with the fins, so that the heat radiation of the refrigerant is promoted. Further, if the shape and arrangement of the fins are determined so that the refrigerant that has collided with the fins does not scatter to the stator side, the coil end can be more reliably prevented from being damaged. On the other hand, if the shape and arrangement of the fins are determined so that the refrigerant that has collided with the fins and decelerated can be guided to the stator side, the coils and the stator can be efficiently cooled without damaging the coil ends by the high-speed refrigerant. It is.

It is sectional drawing of the rotary electric machine which concerns on this invention. It is a top view of a rotary electric machine. It is a disassembled perspective view of a rotary electric machine. It is an enlarged view which shows another form of a fin. It is an enlarged view which shows another form of a control member. It is an enlarged view which shows another form of a control member. It is an enlarged view which shows another form of a control member.

  Based on the cross-sectional view shown in FIG. 1, the plan view shown in FIG. 2, and the exploded perspective view shown in FIG. 3, an embodiment in which the rotating electrical machine according to the present invention is used as an electric motor will be described. In each figure, broken arrows indicate the flow of the refrigerant. The electric motor 1 is a permanent magnet type motor and can be used as a drive source for a hybrid vehicle or an electric vehicle. The electric motor 1 includes a rotor 10 that is pivotally supported on a case 30 by a rotating shaft 40, and a stator 20 that is disposed on the radially outer side of the rotor 10 and is fixed to the case 30. The case 30 is configured by joining a case member 30a constituting the left side portion and a case member 30b constituting the right side portion in FIG. In addition, if it comprises so that the rotating shaft 40 may be driven, this rotary electric machine can also be functioned as a generator.

  The rotor 10 is configured by laminating a plurality of electromagnetic steel plates having punched holes formed at equal intervals in the circumferential direction by press working. As a result, a plurality of refrigerant flow paths 10 a are formed at equal intervals in the circumferential direction of the rotor 10. As shown in FIG. 3, permanent magnets 11 are arranged on the outer sides in the radial direction of the respective refrigerant flow paths 10 a and are bonded and fixed to the rotor 10. While the refrigerant flows through the refrigerant flow path 10a and is discharged from the discharge port 10b, the heat of the permanent magnet 11 is recovered by the refrigerant, so that the permanent magnet 11 can be prevented from being demagnetized due to high temperature. Since the permanent magnet 11 is arranged on the radially outer side of the refrigerant flow path 10a, when centrifugal force acts on the refrigerant during the rotation of the rotor 10, the refrigerant flows so as to contact the permanent magnet 11, and the permanent magnet 11 is efficient. To be cooled. The arrangement of the permanent magnets 11 is not limited to this, and may be arranged in a space provided separately from the cooling flow path 10a, for example.

  The stator 20 is configured by laminating a plurality of electromagnetic steel plates, like the rotor 10. A coil 21 is disposed in the stator 20. When the coil 21 is energized, a magnetic field is generated in the stator 20, and the rotor 10 including the permanent magnet 11 rotates. The coil 21 is provided with insulating paper or an insulating film, and a binding thread is used to bundle a plurality of conductive wires. In the coil end 21a protruding from the stator 20, the insulating paper, the insulating film, the binding yarn, and the like are exposed to the outside, and these may be damaged when a high-speed refrigerant collides. In the present invention, in order to avoid such a problem, a regulating member 50 described later is provided.

  The rotating shaft 40 is pivotally supported on the case 30 via a pair of bearings 31 provided on the case 30. The rotary shaft 40 is configured in a cylindrical shape having an internal space 40a and has a plurality of communication holes 40b formed in the circumferential direction. An output shaft 41 having a concentric shaft with the rotating shaft 40 is connected to one end of the rotating shaft 40 and rotates integrally with the rotating shaft 40. Similar to the rotating shaft 40, the output shaft 41 has an internal space 41a and is formed in a cylindrical shape. A refrigerant sent from a pump (not shown) is introduced into the internal space 40 a of the rotating shaft 40 via the internal space 41 a of the output shaft 41. In addition, you may comprise the rotating shaft 40 and the output shaft 41 as one member.

  The plate member 60 is attached to the surface on the output shaft 41 side (the right side in FIG. 1) of both end surfaces of the rotor 10, and the regulating member 50 is attached to the opposite surface. The communication space 60 a formed in the plate member 60 connects the communication hole 40 b of the rotation shaft 40 and the refrigerant flow path 10 a of the rotor 10, and the refrigerant flows from the internal space 40 a of the rotation shaft 40 to the refrigerant flow path 10 a. It is configured to be able to. The plate member 60 can be attached to the end surface of the rotor 10 by an appropriate means such as adhesion or welding, but it is preferable to provide an elastic member or the like for preventing refrigerant leakage between the plate member 60 and the rotor 10.

  As shown in FIG. 3, the regulating member 50 is configured in a dish shape having a wall portion 50 a and a bottom portion 50 c, and is attached with the bottom portion 50 c abutting against the end surface of the rotor 10. A screw thread is formed on a part of the outer peripheral surface of the rotating shaft 40, and the regulating member 50 is fixed to the rotor 10 by tightening a nut 51 that engages with the screw thread. A communication hole 50d is formed at a position corresponding to the refrigerant flow path 10a of the bottom 50c. In addition, it is also possible to comprise only the annular wall part 50a, without providing the bottom part 50c in the control member 50. FIG.

  When the communication hole 50d is formed closer to the outer side in the radial direction of the refrigerant flow path 10a, the refrigerant flowing along the outer side in the radial direction due to centrifugal force can be easily discharged from the communication hole 50d. On the other hand, when the communication hole 50d is formed closer to the inside in the radial direction of the refrigerant flow path 10a, the refrigerant is discharged from the communication hole 50d after a certain amount or more of the refrigerant has accumulated in the refrigerant flow path 10a. Therefore, since the refrigerant in the refrigerant flow path 10a can recover the heat of the permanent magnet 11 over time, an improvement in cooling efficiency can be expected. That is, what position in the radial direction the communication hole 50d is to be formed may be appropriately determined according to the conditions under which the electric motor 1 is used.

  The front end 50b of the wall portion 50a of the regulating member 50 is configured to protrude further toward the front end side than the front end 21b of the coil end 21a. Therefore, it is possible to prevent the refrigerant discharged radially outward from the tip 50b of the wall 50a from colliding with the coil end 21a. As a result, it is possible to avoid damage to the insulating paper, the insulating film, the binding yarn and the like of the coil end 21a.

  Further, the inner peripheral surface of the wall portion 50a of the regulating member 50 is tapered so that the diameter increases toward the tip. If it carries out like this, when a refrigerant | coolant moves along the internal peripheral surface of the wall part 50a, the speed component to the front-end | tip direction will generate | occur | produce in a refrigerant | coolant by the component of the direction along a taper surface among centrifugal forces. As a result, when the refrigerant is discharged from the discharge port 10b, the discharge direction component can be included in the discharge direction, so that the refrigerant can be more reliably prevented from colliding with the coil end 21a. If the refrigerant can have a sufficient speed component in the tip direction, the refrigerant can be prevented from colliding with the coil end 21a even if the tip 50b of the wall 50a does not protrude from the tip 21b of the coil end 21a. In this case, the height of the wall 50a can be reduced, and the weight, size, and cost of the restricting member 50 can be reduced.

  As in the present embodiment, a fin 32 that protrudes inward in the radial direction can be provided in a region of the inner peripheral surface of the case 30 where the refrigerant collides. After the refrigerant whose temperature has been increased by cooling the permanent magnet 11 is discharged from the rotor 10, the heat exchange through the fins 32 is promoted by contacting the fins 32, so that the refrigerant can be efficiently radiated. . Further, the coolant that collides with the fins 32 and loses the kinetic energy and is cooled is supplied to the stator 20 and the coil 21 through the inner surface of the case 30, so that these members are not damaged and can be efficiently performed. Cooling can be performed. Note that the shape of the fins 32 is not limited to that shown in FIG. 2, and the fins 32 may protrude obliquely from the inner peripheral surface, and the plurality of fins 32 do not necessarily have the same shape.

  As shown in FIG. 4, the fins 32 may be formed so as to protrude from the side surface of the case 30. If the fin 32 extends to the region overlapping with the coil end 21a, the refrigerant can be prevented from colliding with the coil end 21a even if the tip 50b of the wall 50a does not protrude from the tip 21b of the coil end 21a. Become. In this case, the height of the wall 50a can be reduced, and the weight, size, and cost of the restricting member 50 can be reduced. In addition, the fin 32 is not restricted to the above-mentioned form, For example, the disk-shaped thing which protrudes in the radial direction inner side from the internal peripheral surface of case 30 may be sufficient.

  When the rotor 10 rotates at a low speed, the centrifugal force acting on the refrigerant is small, reaches the outer peripheral surface from the inner peripheral surface of the wall portion 50a of the regulating member 50 via the tip 50b, and follows the outer peripheral surface. It may move to the rotor 10 side. If the refrigerant moves along the outer peripheral surface of the wall 50a to a region overlapping with the coil end 21a, then the refrigerant adhering to the outer peripheral surface of the wall 50a when the rotational speed of the rotor 10 increases. May collide with the coil end 21a. The form of the wall part 50a of the control member 50 for avoiding such a problem is demonstrated based on FIGS.

  As shown in FIG. 5, if the recess 50e is provided on the outer peripheral surface of the wall 50a, the refrigerant moves radially inward from the outer peripheral surface of the wall 50a toward the bottom of the recess 50e against the centrifugal force. Since this is difficult, the refrigerant is likely to be scattered radially outward by centrifugal force before reaching the recess 50e. Since the recessed part 50e is provided in the area | region of the front end side rather than the front-end | tip 21b of the coil end 21a among the outer peripheral surfaces of the wall part 50a, it can suppress that a refrigerant | coolant moves to the area | region of the coil end 21a. As a result, it is possible to more reliably prevent the refrigerant from colliding with the coil end 21a and damaging the coil end 21a.

  As shown in FIG. 6, the same effect can be obtained even if the protrusion 50 f is provided on the outer peripheral surface of the wall 50 a. That is, when the refrigerant moves to the top of the convex portion 50f, it is difficult to move radially inward from the outer surface of the wall portion 50a against the centrifugal force. It becomes easy to scatter outward in the direction. Since the convex part 50f is provided in the area | region of the front end side rather than the front-end | tip 21b of the coil end 21a among the outer peripheral surfaces of the wall part 50a, it can suppress that a refrigerant | coolant moves to the area | region of the coil end 21a. As a result, it is possible to more reliably prevent the refrigerant from colliding with the coil end 21a and damaging the coil end 21a.

  Further, as shown in FIG. 7, an inclined portion 50 g whose diameter decreases toward the rotor 10 side may be provided on the outer peripheral surface near the tip 50 b of the wall portion 50 a. In this case, since it is difficult for the refrigerant adhering to the tip 50b of the wall 50a to move radially inward along the slanted portion 50g against the centrifugal force, the refrigerant 50d radially outward by the centrifugal force in the slanted portion 50g. It becomes easy to scatter. As a result, it is possible to more reliably prevent the refrigerant from colliding with the coil end 21a and damaging the coil end 21a. FIG. 7 shows a form in which the inclined portion 50g is formed from the tip 50b. However, if the outer peripheral surface of the wall portion 50a is a region closer to the tip than the tip 21b of the coil end 21a, the inclined portion 50g is formed. You may form in another position.

  In the above embodiment, the restriction member 50 having the wall portion 50 a is attached to the rotor 10. However, a member having the same function as the restriction member 50 is attached to the stator 20 and the case 30 and discharged from the rotor 10. It is possible to prevent the refrigerant from colliding with the coil end 21a.

  The present invention includes a rotor provided with a refrigerant flow path that is pivotally supported on a case by a rotation shaft and penetrates in a direction along the axis of the rotation shaft, and a stator that is disposed radially outside the rotor and is fixed to the case. It can be applied to the rotating electrical machine provided.

1 Electric motor (rotary electric machine)
DESCRIPTION OF SYMBOLS 10 Rotor 10a Flow path for refrigerants 10b Discharge port 20 Stator 21 Coil 21a Coil end 21b Coil end tip 30 Case 32 Fin 40 Rotating shaft 50 Restriction member 50a Wall portion 50b Wall tip 50e The part where the diameter on the base end side is smaller than the diameter on the tip end side)
50f Convex part (part where the diameter on the base end side becomes smaller than the diameter on the front end side in the outer peripheral surface of the wall part)
50g oblique part (part where the diameter on the base end side becomes smaller than the diameter on the tip end side of the outer peripheral surface of the wall part)

Claims (3)

A rotor provided with a refrigerant flow path that is pivotally supported on the case by a rotating shaft and penetrates in a direction along the axis of the rotating shaft;
A stator that is disposed radially outside the rotor and fixed to the case;
The refrigerant discharged from the discharge port is prevented from colliding with the coil end between the discharge port of the refrigerant flow path formed in the rotor and the coil end of the coil provided in the stator. A regulating member having an annular wall ,
The wall portion is provided on the end surface of the rotor, the tip of the wall portion is configured to protrude beyond the tip of the coil end, and the diameter of the inner peripheral surface of the wall portion increases toward the tip side. The rotating electrical machine is formed as follows . 2. The rotating electrical machine according to claim 1 , wherein a portion of the outer peripheral surface of the wall portion is provided in a region closer to a distal end side than a distal end of the coil end with a base end side diameter being smaller than a distal end side diameter. The rotating electrical machine according to claim 1 or 2 , wherein a fin projecting inward is provided in a region of the inner peripheral surface of the case where the refrigerant discharged from the discharge port collides.

Images