JP2014138465A - Rotor of rotary electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a support structure of a rotor core which easily changes a discharge direction in a rotary electric machine which discharges a coolant from a rotor to the radial outer side.SOLUTION: A rotor 14 includes: a rotor shaft 30; and a rotor core part 18 attached to a core attachment part 34 of the rotor shaft 30. A coolant passage 38 in which a coolant flows is formed in the rotor core part 18. The coolant passage 38 opens at a coolant discharge port 44 located on an end surface of the rotor core part 18. A support part 48 and a coolant guide piece 50 are separately provided at an end of the core attachment part 34 when viewed in a rotation axis line direction. The support part 48 supports the rotor core part 18 in the rotation axis line direction. The coolant guide piece 50 is positioned so as to be spaced away from the end surface of the rotor core part 18 and correspond to the coolant discharge port 44. Changing the shape of the coolant guide piece 50 may change a discharge direction of the coolant without affecting the support part 48.

Description

  The present invention relates to a rotor of a rotating electrical machine, and more particularly to its structure.

  An electric motor that converts electrical energy into rotational kinetic energy, a generator that converts rotational kinetic energy into electrical energy, and an electric device that functions as both the motor and the generator are known. Hereinafter, these electric devices are referred to as rotating electric machines.

  Patent Document 1 listed below discloses a technique in a rotating electrical machine in which liquid refrigerant is sent from the rotating shaft (140) toward the radially outer side of the rotor to cool the coil end (173) of the stator (170). ing. The magnet plate (130) disposed at the end of the rotor core (121) and the notches (160, 161) provided in the end plate (131), and the base (142) for supporting the rotor core (121) from the direction of the rotation axis of the rotor ) And the fixing member (145) form a flow path for sending the liquid refrigerant radially outward. The coil end is cooled by the liquid refrigerant sent through this flow path. In addition, the code | symbol with the parenthesis used by description regarding the cited reference 1 is a code | symbol used in the said literature.

JP 2009-81953 A

  In the structure described in Patent Document 1, the base (142) and the fixing member (145) have a function of supporting the rotor core (121), and the liquid refrigerant delivery direction is changed while maintaining this support function. Design changes are not easy.

  The present invention provides a rotor structure that is easy to change in design to change the delivery direction of the coolant (liquid refrigerant).

  The rotor of the rotating electrical machine of the present invention has a characteristic structure in the core mounting portion of the rotor shaft. The core mounting portion has a rotor core portion mounted on the outer periphery thereof. The rotor core portion is provided with a coolant discharge port that opens to the end surface in the rotation axis direction. The core mounting portion is provided with a support portion that supports the rotor core portion and a coolant guide piece that guides the coolant. A support part supports the end surface of a rotor core part from a rotating shaft direction. The coolant guide piece is disposed at a distance from the coolant discharge port, and is positioned to face the coolant discharge port that opens at the end surface of the rotor core portion. The coolant guide piece directs the coolant discharged from the coolant discharge port outward in the radial direction of rotation.

  The support portion and the coolant guide piece can be arranged at different positions in the rotational circumferential direction. Further, the tip of the coolant guide piece can be positioned radially outward from the coolant discharge port. Furthermore, a wall can be provided on the side of the coolant guide piece in the circumferential direction of the rotation, and the coolant guide piece can have a groove shape through which the coolant flows.

  By separately providing the support part for supporting the rotor core part and the coolant guide piece for guiding the coolant, the coolant can be guided independently of the support mode.

It is sectional drawing which shows schematic structure of the rotary electric machine of this embodiment. It is a figure explaining the support mode of the rotor core part 18 by the support part 48. FIG. 4 is an explanatory diagram of a coolant guide piece 50. FIG. It is explanatory drawing of the manufacturing process of a rotor, and is a figure which shows the state which has arrange | positioned the rotor core part 18 in the core mounting part 34 especially. FIG. 5 is an explanatory diagram of a manufacturing process of a rotor, and shows a state in which a support portion 48 and a coolant guide piece 50 are formed by bending an end portion of a core mounting portion 34 from the state of FIG. 4. It is a figure which shows the formation process of the coolant guide piece 60 which is another example of a coolant guide piece. It is a figure which shows the formation process of the cooling fluid guide piece 60, and is a figure which shows the state which bent the side wall formation part 70 from the state of FIG. It is a figure which shows the state in which the coolant guide piece 60 was formed.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a diagram illustrating a schematic configuration of a rotating electrical machine 10 according to the present embodiment, and is a diagram illustrating a cross section including a rotation axis 12 of the rotating electrical machine 10. In the following description, a direction parallel to the rotation axis 12 is referred to as a rotation axis direction, a direction around the rotation axis 12 is referred to as a rotation circumferential direction, and a direction perpendicular to the rotation axis 12 is referred to as a radial direction.

  The rotating electrical machine 10 includes a rotor 14 that rotates about a rotation axis 12 and a stator 16 that is provided so as to surround the rotor 14. The rotor 14 has a substantially cylindrical rotor core portion 18. The rotor core portion 18 includes a rotor core 20 in which electromagnetic steel plates having a predetermined cross-sectional shape are stacked in the rotation axis direction, and end face plates 22 disposed at both ends of the rotor core 20 in the rotation axis direction. The end face plate 22 suppresses the deformation of the electromagnetic steel sheet by pressing the electromagnetic steel sheet forming the rotor core 20 from the rotation axis direction. When the deformation of the electromagnetic steel plate is not a problem, one or both of the end face plates 22 can be omitted. In the aspect in which the end face plate 22 is omitted, the rotor core 20 forms the rotor core portion 18.

  The stator 16 includes a stator core 24 positioned so as to surround the rotor core 20. The stator core 24 has a substantially cylindrical shape having an inner peripheral surface facing the outer peripheral surface of the rotor core portion 18. The stator core 24 is formed by laminating electromagnetic steel sheets having a predetermined cross-sectional shape. Teeth (not shown) are arranged on the inner peripheral surface of the stator core 24 at intervals in the circumferential direction, and a conductive wire is wound around the teeth to form a coil 26. In FIG. 1, only the portion of the coil 26 that protrudes from the end face in the rotation axis direction of the stator core 24 is shown, and the portion that is housed between the teeth is not shown. A portion protruding from the end face of the stator core 24 is called a coil end 28.

  When electric power is supplied to the coil 26, a rotating magnetic field is formed by the stator 16, and the rotor 14 is rotated by the interaction between the rotating magnetic field and the rotor core 20. In order to generate an interaction with the rotating magnetic field, for example, a permanent magnet (not shown) can be incorporated in the rotor core 20.

  The rotor 14 has a rotor shaft 30 on which the rotor core portion 18 is mounted. The rotor shaft 30 includes a shaft portion 32 that serves as a power transmission shaft, and a core mounting portion 34 that is positioned radially outward from the shaft portion 32 and on which the rotor core portion 18 is mounted on the outer periphery. The rotor core portion 18 is mounted on the cylindrical outer peripheral surface 36 of the core mounting portion 34.

  A coolant flow path 38 through which the coolant flows is provided inside the rotor core portion 18. In the rotary electric machine 10, the coolant flow path 38 is formed by being surrounded by a groove provided in the inner peripheral surface of the rotor core portion 18 and extending in the rotation axis direction, and an outer peripheral surface 36 of the core mounting portion. The core mounting portion 34 is provided with a coolant supply hole 40 that supplies the coolant to the coolant channel 38. The coolant supply hole 40 is provided so as to connect the inner peripheral surface and the outer peripheral surface of the cylindrical portion of the core mounting portion 34, and the coolant in the space 42 inside the core mounting portion 34 is cooled by the centrifugal force. It sends to the flow path 38. The coolant flow path 38 is open to the end surface (the left end of the rotor core portion 18 in FIG. 1) in the rotation axis direction of the rotor core portion 18. Coolant is discharged from this opening. Therefore, this opening is a coolant discharge port 44 that discharges the coolant provided on the end face of the rotor core portion 18.

  The coolant flow path may be arranged to be inclined with respect to the rotation axis 12. For example, the rotation axis 12 may be positioned in one cylindrical surface having the central axis as the central axis, and may be inclined with respect to the rotation axis 12. This is achieved by laminating the electromagnetic steel plate and the end face plate 22 forming the rotor core portion 18 so that the holes or notches provided in the rotor steel plate 18 are gradually shifted in the circumferential direction. The coolant can also be used as a lubricating oil for lubricating the sliding portion of the rotating electrical machine 10.

  With reference to FIGS. 1-3, the aspect of the support of the rotor core part 18 is demonstrated. A flange 46 is provided at one end (right end in FIG. 1) of the core mounting portion 34 in the rotation axis direction, and the rotor core portion 18 abuts against the flange 46. At the other end, the cylindrical end portion of the core mounting portion 34 is bent outward in the radial direction and is in contact with the end surface of the rotor core portion 18. This portion is referred to as a support portion 48. The support portion 48 supports the end surface of the rotor core portion 18 in the rotational axis direction, and determines the position of the rotor core portion 18 in the rotational axis direction in cooperation with the flange 46.

  FIG. 2 is a perspective view showing details of a mode of support by the support portion 48, and shows a cross section including the rotation axis 12 passing through the support portion 48. The inner peripheral surface of the rotor core portion 18 is in close contact with the outer peripheral surface 36 of the core mounting portion. The end of the core mounting portion 34 extends beyond the end surface in the rotation axis direction of the rotor core portion 18, and the extending portion is bent outward in the radial direction and is in contact with the end surface of the rotor core portion 18.

  Returning to FIG. A coolant guide piece 50 is provided at a position facing the coolant discharge port 44 at the end (left end in FIG. 1) of the core mounting portion 34. The coolant guide piece 50 is located at a distance from the end face of the rotor core portion 18, thereby opening the coolant discharge port 44 without blocking it. The coolant guide piece 50 is not in contact with the end face of the rotor core 18 and does not have a function of supporting the rotor core 18 in the rotation axis direction. Further, the tip of the coolant guide piece 50 is located on the radially outer side from the coolant discharge port 44. With this arrangement, it is possible to ensure that the coolant discharged from the coolant discharge port 44 strikes the coolant guide piece 50.

  FIG. 3 is a perspective view showing a cross section including the rotation axis 12 through the coolant guide piece 50. A part of the end of the core mounting portion 34 is bent outward in the radial direction to form the coolant guide piece 50. A gap is formed between the coolant guide piece 50 and the end face of the rotor core portion 18. The coolant discharged from the coolant discharge port 44 hits the coolant guide piece 50 facing the coolant discharge port 44, and the direction is changed outward in the radial direction. In order to change the direction efficiently, the portion of the coolant guide piece 50 that faces the coolant discharge port 44 can be curved. As shown in the cross sections of FIGS. 1 and 3, the coolant guide piece 50 has a substantially arc shape at a portion facing the coolant discharge port 44, and the direction of the coolant is changed by the curved surface portion. The coolant directed radially outward reaches the coil end 28 and cools it. A portion of the coolant guide piece 50 facing the coolant discharge port 44 may be a slope. The direction and angle of the inclination are determined so that the coolant that hits the inclined surface faces the radially outer side, particularly toward the coil end 28. Further, as described above, since the tip of the coolant guide piece 50 is positioned radially outward from the coolant discharge port 44, the direction of the coolant to be delivered can be changed more reliably.

  The support 48 and the coolant guide piece 50 are provided at different positions in the rotational circumferential direction. Therefore, the coolant guide piece 50 can determine its own shape without being affected by the shape or the like of the support portion 48. Therefore, adjustment of the direction in which the coolant is delivered can be performed only by changing the shape of the coolant guide piece 50, and the support of the rotor core portion 18 is not affected.

  It is preferable to provide a notch 52 between the coolant guide piece 50 and the support portion 48 so as not to interfere with each other when bending them. The width of the notch 52 in the rotational circumferential direction is preferably small. By reducing the width of the cut, it is possible to reduce the unused portion of the end of the core mounting portion that is not the support portion 48 and the coolant guide piece 50. Further, the cooling liquid guide piece 50 may be one or plural. Moreover, when providing with two or more, it is preferable to arrange | position at equal intervals in a rotation circumferential direction.

  As described above, the coolant reaches the coolant discharge port 44 from the space 42 inside the cylinder of the core mounting portion 34 through the coolant supply hole 40 and the coolant flow path 38 according to the arrow in FIG. , And is directed outward in the radial direction by the coolant guide piece 50 and delivered toward the coil end 28.

The outline of the manufacturing process of the rotor 14 is as follows.
(1) A rotor shaft having a core mounting portion is prepared.
(2) A rotor core portion having a substantially cylindrical shape and a coolant discharge port on a cylindrical end surface is prepared.
(3) The rotor core portion is disposed so as to surround the periphery of the core mounting portion.
(4) The end portion of the core mounting portion in the axial direction of the rotor shaft is bent and brought into contact with the end surface of the rotor core portion to form a support portion that supports the rotor core portion.
(5) At least a part of the core mounting portion in the axial direction of the rotor shaft, other than the portion serving as the support portion, is bent and opposed at a distance from the coolant discharge port. A coolant guide piece for directing the coolant discharged from the discharge port to the outside in the radial direction of the rotor is formed.

  4 and 5 are explanatory diagrams of the manufacturing process of the rotor 14, particularly the process related to the mounting of the rotor core portion 18. FIG. 4 is a diagram illustrating a state in which the rotor core portion 18 is disposed so as to surround the periphery of the core mounting portion 34. One end (the upper end in FIGS. 4 and 5) of the core mounting portion 34 of the rotor shaft is in a state of extending straight in the rotation axis direction. In FIG. 4, a portion that will later become the support portion 48 is indicated by reference numeral 54, and this portion is hereinafter referred to as a support portion forming portion 54. Similarly, a portion that will later become the coolant guide piece 50 is indicated by reference numeral 56, and this portion is hereinafter referred to as a guide piece forming portion 56. A notch 52 is provided between the support portion forming portion 54 and the guide piece forming portion 56. The cut 52 is cut to at least the same position (depth) as the end face of the rotor core 18 when the rotor core 18 is disposed around the core mounting portion 34. Further, when the rotor core portion 18 is disposed in the core mounting portion 34, the position of the coolant discharge port 44 is aligned with the position of the guide piece forming portion 56.

  After the rotor core portion 18 is disposed, the support portion forming portion 54 and the guide piece forming portion 56 are bent outward in the radial direction. As shown in FIG. 2, the support portion forming portion 54 is bent so as to contact the end surface of the rotor core portion 18 to form the support portion 48. As described above, the support portion 48 supports the rotor core portion 18 in the rotation axis direction. The coolant guide piece 50 is bent so as to be separated from the end face of the rotor core portion 18. As a result, the coolant discharged from the coolant discharge port 44 is delivered without being blocked by the coolant guide piece 50. Since the notch 52 is positioned between the support portion forming portion 54 and the guide piece forming portion 56, the bending of the support portion forming portion 54 and the guide piece forming portion 56 does not affect each other. The bending of the support portion forming portion 54 and the guide piece forming portion 56 can be performed simultaneously or separately.

  6-8 is a figure which shows other embodiment of a coolant guide piece. The configuration other than the coolant guide piece is the same as the configuration of the above-described embodiment, and the same reference numerals are given and description thereof is omitted. The coolant guide piece 60 shown in these drawings includes a bottom portion 62 corresponding to the coolant guide piece 50 described above, and a side wall 64 provided on a side of the bottom portion 62 in the circumferential direction (see FIG. 8). In FIG. 8, only one side wall 64 provided on the back side in the drawing of the bottom portion 62 is shown, but the side wall 64 is also provided on the near side of the bottom portion 62. A groove having a substantially U-shaped cross-sectional shape is formed by the bottom portion 62 and the two side walls 64.

  FIG. 6 shows a state before the support portion 48 and the coolant guide piece 60 are formed. The guide piece forming portion 66 that will later become the coolant guide piece 60 is in a state of extending in the direction of the rotation axis. The guide piece forming portion 66 includes a bottom forming portion 68 that later becomes the bottom 62 and a side wall forming portion 70 that later becomes the side wall 64. The side wall forming portion 70 extends from the bottom forming portion 68 in the circumferential direction. In the drawing, the side wall forming portion 70 extending in the back is shown, but the side wall forming portion 70 is also provided on the near side. In order to form the coolant guiding piece 60, first, as shown in FIG. 7, the side wall forming portion 70 is bent so as to face outward in the radial direction. The side wall forming portion 70 on the near side not shown in the drawing is also bent in the same manner. As a result, the guide piece forming portion 66 is formed into a substantially U-shaped cross-sectional shape. And the bottom part formation part 68 is bent so that it may face a radial direction outer side, and the cooling fluid guide piece 60 is formed like FIG. The coolant guide piece 60 is positioned so as to be spaced from the end face of the stator core portion 18 and to face the coolant discharge port 44 in the same manner as the coolant guide piece 50 described above. The coolant guide piece 60 can be bent until the tip of the side wall 64 reaches the end face of the rotor core portion 18.

  The side wall 64 of the coolant guide piece 60 serves to prevent the coolant from escaping in the circumferential direction. That is, since the coolant guide piece 60 has a groove shape extending in the radial direction, the coolant flows along the groove and is sent outward in the radial direction.

  The coolant guide pieces 50 and 60 according to the above-described embodiment are provided separately from the support portion 48, and the shape can be changed without changing the mode of the support portion 48. Thereby, for example, the change direction of the coolant can be easily changed.

  DESCRIPTION OF SYMBOLS 10 Rotating electrical machine, 14 Rotor, 16 Stator, 18 Rotor core part, 20 Rotor core, 22 End face plate, 32 Shaft part, 34 Core mounting part, 38 Coolant flow path, 44 Coolant discharge port, 48 Support part, 50, 60 Cooling Liquid guide piece, 54 support part forming part, 56 guide piece forming part, 62 bottom part, 64 side wall.

Claims (4)

A rotor of a rotating electric machine,
A rotor shaft having a core mounting portion and rotatable about a rotation axis;
A rotor core portion mounted on the outer periphery of the core mounting portion;
A support portion provided in the core mounting portion and supporting the end surface of the rotor core portion from the rotation axis direction;
A coolant discharge port that opens to the end surface of the rotor core in the rotation axis direction;
A cooling liquid guide piece that extends from the core mounting portion, is positioned to face the cooling liquid discharge opening at a distance from the cooling liquid discharge opening, and directs the cooling liquid discharged from the cooling liquid discharge opening outward in the radial direction;
A rotor for a rotating electrical machine.   The rotor of a rotating electrical machine according to claim 1, wherein the support portion and the coolant guide piece are provided at different positions in the rotational circumferential direction.   3. The rotor of a rotating electrical machine according to claim 1, wherein the tip of the coolant guide piece is positioned radially outward from the coolant discharge port. 4.   The rotor of the rotating electrical machine according to any one of claims 1 to 3, wherein the coolant guide piece has a wall on a side in a rotational circumferential direction and has a groove shape through which the coolant flows. Rotor for rotating electrical machines.

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