WO2009014197A1

WO2009014197A1 - Rotary machine

Info

Publication number: WO2009014197A1
Application number: PCT/JP2008/063342
Authority: WO
Inventors: Toshiharu Aikou; Takayasu Suwama
Original assignee: Toyota Jidosha Kabushiki Kaisha
Priority date: 2007-07-20
Filing date: 2008-07-17
Publication date: 2009-01-29
Also published as: JP2009027862A; JP4424385B2

Abstract

A rotary machine (100) includes: a stator (12); a rotor (20) inserted into the stator (12) and rotatably supported; a magnet reception unit (32) formed in the rotor (20); a permanent magnet (22) mounted in the magnet reception unit (32); a hole (31) arranged apart from the magnet reception unit (32) and extending in the axis direction; an end plate (23) arranged at the end surface of the axial direction of the rotor (20); a channel (33) defined by at least one of the axial direction end surface and the end plate (23) and leading from above the opening of the hole (31) to above the axial direction end surface of the permanent magnet (22); and a discharge exit defined by at least one of the axial direction end surface and the end plate (23) of the rotor (20) so as to communicate with the channel (33).

Description

Technical specification

The present invention relates to a rotary electric machine, and relates to a rotary electric machine in which a permanent magnet is provided on a rotor. Background art

Conventionally, in motors and rotating electrical machines, permanent magnet cooling and rotor weight reduction have been attempted. For example, Japanese Patent Application Laid-Open No. 2 005-0 2 0 8 5 5 proposes an electric motor in which the weight of the electric motor is reduced without lowering the electric motor output. In this electric motor, a trapezoidal through-hole is formed in a portion of the rotor core located on the inner diameter side from the central portion of the permanent magnet. This increases the area of the through-hole without obstructing the flow of magnetic flux lines, and provides a high-power and lightweight motor. In addition, Japanese Patent Laid-Open No. 2 00 2-3 4 5 1 8 8 proposes a rotating electrical machine that efficiently cools a permanent magnet without reducing the output of the rotating electrical machine. In this rotating electrical machine, the outer peripheral side surface of the permanent magnet is in close contact with the permanent magnet insertion hole, and a cooling passage through which the refrigerant is guided along the permanent magnet insertion hole is formed on the inner side of the permanent magnet. The cooling system including this cooling passage is closed circuit. Further, in this Japanese Patent Laid-Open No. 2 0 2-3 4 5 1 8 8, an upstream side passage formed in an axis of a rotating shaft, a downstream side passage, and these passages and a cooling passage communicate with each other. Thus, a rotating electrical machine having a branch passage formed in an end plate is described.

Furthermore, Japanese Patent Laid-Open No. 2 006-0 2 5 5 4 5 provides a rotating electrical machine that prevents the insulation of the stator windings from being lowered by the cooling liquid splashed from the rotor. In this rotating electrical machine, a guide path is provided between the rotor shaft and the rotor core and the end plate, and the cooling oil supplied into the rotary shaft by this guide path is based on the rotational centrifugal force. Then, guide it toward the outer surface of the end plate and scatter it toward the end of the stator winding.

In the electric motor described in Japanese Patent Laid-Open No. 2 0 0 5-0 2 0 8 5 5, There was a problem that the balance of the center of gravity of the rotor deteriorated because the coolant for cooling the rotor and the lubricating oil for ensuring the lubrication of the bearing entered the through hole formed in the trapezoidal shape.

Of the rotary turtle machines described in Japanese Patent Laid-Open No. 2 0 2-3 4 5 1 8 8, in a rotating electrical machine in which a cooling system circuit is formed, the cooling system circuit is a closed circuit, If external lubricating oil or refrigerant enters the cooling passage, the weight balance of the rotor will be lost. In addition, in a rotating electrical machine in which a branch passage is formed in the end plate, the supply amount supplied into the lower branch passage is greater than the supply amount supplied into the upper branch passage. As a result, the rotor is out of balance. Further, in the rotating electrical machine described in Japanese Patent Laid-Open No. 2-06-0625 55 45, the permanent magnet cooling effect cannot be obtained. Disclosure of the invention

The present invention has been made in view of the above-described problems, and its object is to provide a rotating electrical machine that is capable of cooling a permanent magnet, reducing the weight of the rotor, and suppressing variations in the weight balance of the rotor. It is to be.

A rotating electrical machine according to the present invention includes a ring-shaped stator, a rotor inserted into the stator and rotatably supported, a magnet mounted in a magnet receiving portion formed in the rotor, and a rotor And an end plate provided on the end face in the axial direction. In the rotor, a hole extending in the axial direction of the rotor is formed at a position away from the magnet receiving portion. Furthermore, a path passing from the opening of the hole through the axial end surface of the magnet is defined by at least one of the axial end surface of the rotor and the end plate, and a discharge port communicating with the path is defined by It is formed by at least one of the end face and the end plate.

Preferably, the hole is positioned on the rotation center side of the rotor with respect to the magnet. Preferably, the discharge port is located at an outer peripheral edge of the rotor.

Preferably, the end plate includes a guide portion capable of guiding the refrigerant supplied into the path from the hole portion to the end surface of the magnet.

Preferably, the end plate closes a part of the opening of the hole, A part of the opening is defined as a flow port through which the refrigerant can flow, and the flow port is provided at a position shifted in the circumferential direction of the rotor with respect to the magnet.

Preferably, the opening of the through hole is formed such that the circumferential length increases from the radially inner side of the rotor toward the radially outer side.

It is planned from the beginning of the application to combine the above configurations as necessary.

According to the rotating electrical machine of the present invention, the permanent magnet can be cooled, and the weight of the rotor and the weight balance of the rotor can be made uniform. Brief Description of Drawings

FIG. 1 is a side sectional view of the rotating electrical machine according to the first embodiment of the present invention.

FIG. 2 is a cross-sectional view taken along the line I I—I I shown in FIG.

FIG. 3 is an enlarged cross-sectional view of a part of FIG.

FIG. 4 is a cross-sectional view showing the rotor of the rotating electrical machine according to the second embodiment of the present invention. Figure 5 is an enlarged view of a part of Figure 4

FIG. 6 is a cross-sectional view of the rotor of the rotating electrical machine according to the third embodiment of the present invention.

FIG. 7 is an enlarged view of a part of FIG. BEST MODE FOR CARRYING OUT THE INVENTION

A rotating electrical machine 100 according to an embodiment of the present invention will be described with reference to FIGS. Note that the same or corresponding components are denoted by the same reference numerals and description thereof is omitted. 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, unless otherwise specified, it is planned from the beginning to appropriately combine the features of each embodiment.

(Embodiment 1)

FIG. 1 is a side sectional view of rotating electrical machine 100 according to Embodiment 1 of the present invention. In addition, The rotating electrical machine has at least one of a function as a motor and a function as a generator, and has a function as a motor generator.

The rotating electrical machine 100 is configured to be formed in an annular shape, disposed on a rotating shaft 10 that is rotatably supported, a rotor 20 fixed to the rotating shaft 10, and an outer periphery of the rotor 20. And a stator 1 2.

The stator 12 is formed in a ring shape and wound around a stator core 14 formed by laminating a plurality of electromagnetic steel plates, and stator teeth formed on the inner peripheral surface of the stator core 14 at a plurality of intervals. Coil 1 and 3. The coin 13 includes a U-phase coil, a V-phase coil, and a W-phase coil.

The rotor 20 includes a rotor core 2 1 in which a plurality of electromagnetic steel plates are laminated, and a rotor core 2

1 includes a permanent magnet 2 2 attached to 1 and an end plate 2 3 provided at an axial end of the rotor core 21. The rotor core 21 is formed by laminating a plurality of magnetic steel plates. In the rotor core 21, a plurality of permanent magnet accommodation holes 32 extending along the rotation axis O of the rotary shaft 10 are formed at intervals in the circumferential direction. The permanent magnet housing hole 32 is filled with a permanent magnet 22 and a resin that adheres the permanent magnet 22 to the inner wall surface of the rotor core 21 defining the permanent magnet housing hole 32. In addition, a plurality of through holes 31 are formed in a portion located radially inward of the rotor core 21 with respect to the permanent magnets 22 and the permanent magnet housing holes 32. As described above, since the rotor core 21 is formed with the plurality of through holes 31, the weight of the rotor core 21 is reduced.

An end plate 23 is provided on the end surface of the rotor core 21 in the axial direction. The end plate 23 is formed with a path 33 passing from the opening of the through hole 31 to the axial end surface of the permanent magnet 22.

FIG. 2 is a cross-sectional view taken along the line II-II shown in FIG. Here, the permanent magnet receiving hole 3 2 includes a receiving hole 3 2 A inclined inward in the radial direction of the rotor core 21 toward the rotational direction P of the rotor 20, and the receiving hole 3. 2 A with a receiving hole 3 2 B located in the front direction of rotation P with respect to 2 A. The housing hole 3 2 B is formed so as to incline from the radially inner side of the rotor core 21 toward the outer side in the rotational direction P. In each receiving hole 3 2 A, 3 2 B, permanent magnet 2 2 A, 2 2 B is housed. The permanent magnets 22 accommodated in the permanent magnet accommodation holes 32 adjacent to each other in the circumferential direction of the rotor core 21 have different magnetic poles arranged toward the outer periphery of the rotor core 21.

FIG. 3 is an enlarged cross-sectional view of a part of FIG. As shown in FIG. 3, the accommodation hole 3 2 A and the accommodation hole 3 2 B of the permanent magnet accommodation hole 32 are slightly separated from each other in the circumferential direction of the rotor core 21. For this reason, the thin hole portion 36 is defined in the portion located between the accommodation hole 3 2 A and the accommodation hole 3 2 B by the accommodation hole 3 2 A and the accommodation hole 3 2 B. The thin portion 36 extends in the radial direction of the rotor core 21.

A thick portion 37 is defined in a portion of the rotor core 21 located between the permanent magnet accommodation holes 3 2.

In the rotor core 21, through-holes 3 1 A and 3 1 B are provided in the circumferential direction of the rotor core 21 in the portion located radially inward of the rotor core 21 with respect to the permanent magnet housing hole 3 2. It is formed at intervals. In the rotor core 21, partition walls 70 that partition the through holes 31 are formed between the through holes 3 1. Each through hole 3 1 is located radially inward of the rotor core 21 with respect to the thick portion 37. In other words, the thin portion 36 and the partition wall 70 are arranged in the radial direction of the rotor core 21. Further, the partition wall 70 defined between the through holes 31 is positioned radially inward with respect to the thin portion 36. A through hole 31 is formed in a portion located radially inward with respect to the thick portion 37.

The through hole 31 is formed in a substantially sector shape so that the size in the circumferential direction of the rotor core 21 increases from the radially inner side to the outer side of the rotor core 21. For this reason, the partition walls 70 located between the through holes 31 are formed so as to extend in the radial direction of the rotor core 21.

As described above, the portion of the rotor core 21 where the thin portion 36 is located has low rigidity, while the partition wall 70 is located in the radial direction, so that the portion where the thin portion 36 is located. The radial rigidity can be ensured.

On the other hand, since the thick portion 37 has high rigidity, even if the through hole 31 is formed on the radially inner side with respect to the thick portion 37, the rigidity can be ensured.

Therefore, the central portion in the circumferential direction of the rotor core 21 of each through hole 3 1 is the receiving hole 3 2 A, It is located at a position shifted in the circumferential direction with respect to the central portion of 3 2 B in the circumferential direction.

The rotor core 2 1 and the end plate 2 3

A path 3 3 is defined on the axial end face of 2 1.

Here, as shown in FIG. 1 and FIG. 3, the end plate 23 is formed in a disc-shaped top plate portion 1 2 4 and a peripheral portion of the top plate portion 1 2 4 in the circumferential direction. And peripheral wall portions 1 2 3 formed at intervals.

Each peripheral wall portion 1 2 3 is located on the radially outer side of the rotor core 21 with respect to the thin portion 3 6.

Here, among the surfaces of the top plate portion 1 24, a path defining portion 1 33 that defines the path 33 is formed on the surface facing the axial end surface of the rotor core 21.

The path defining portion 1 3 3 includes an annular portion 1 3 3 B formed in an annular shape so as to cover a portion of the axial end surface of the rotor core 21 located around the rotary shaft 10, and the annular portion 1 3 3 B is provided with protrusions 1 3 3 A that protrude from the peripheral edge of the rotor core 21 toward the radial direction of the rotor core 21 and are formed at intervals in the circumferential direction.

A path 33 is defined on the axial end surface of the rotor core 21 by the circumferentially adjacent projecting portion 1 33 3 A and the peripheral wall portion 1 23 3.

Here, the circumferentially adjacent protrusions 1 3 3 A communicate with part of the openings of the through holes 3 1 A and 3 1 B adjacent in the circumferential direction, and further toward the radial direction of the rotor core 21. An extended communication path 1 3 4 is defined.

And, by the path defining portion 1 3 3, a part of the opening of each through hole 3 1 A, 3 1 B is positioned as the supply port 1 3 1 A, 1 3 1 B in the communication passage 1 3 4 .

For this reason, the lubricating oil may enter the through hole 31 through the gap between the end plate 2 3 and the axial end surface of the rotor core 21. However, the lubricating oil and refrigerant in the through hole 31 are routed through the path 3 Since supply ports 1 3 1 A and 1 3 1 B that can be supplied (discharged) in 3 are defined, the lubricant can be discharged from the through hole 3 1.

In particular, the communication path 1 3 4 extends from the supply ports 1 3 1 A and 1 3 1 B outward in the radial direction of the rotor core 21. Therefore, the lubricating oil or refrigerant that has entered the communication path 1 3 4 from the supply ports 1 3 1 A and 1 3 1 B flows out into the communication path 1 3 4 due to the centrifugal force of the rotor core 21. In this way, the lubricating oil and refrigerant in each through hole 3 1 are routed. 3 Since it can be discharged into the interior of the through hole 31, it is possible to reduce the amount of accumulated lubricating oil and refrigerant in each through-hole 31, and the difference in the amount of lubricating oil stored in each through-hole 31 can be reduced. Can be reduced.

For this reason, it is possible to suppress the occurrence of bias in the weight balance in the rotor 20. Thereby, even when the rotating electrical machine is driven, it is possible to suppress the rotor 20 from vibrating.

The tip of the protrusion 1 3 3 A is located radially inward of the permanent magnet housing hole 3 2 in the axial end surface of the rotor core 21, and the protrusion 1 3 3 A is the peripheral wall 1 2 3 Extends towards the circumferential edge.

For this reason, in the path 3 3, the extending direction of the communication path 1 3 4 (the rotor core 2 1 of the rotor core 21) A discharge path 1 3 5 is defined that extends in a direction that intersects (radial direction). The discharge path 1 3 5 is formed so as to pass on the axial end surfaces of the permanent magnets 2 2 A and 2 2 B. A discharge port 3 3a for discharging the lubricating oil and refrigerant in the discharge passage 1 3 5 to the outside is defined by the peripheral wall portions 1 2 3 adjacent in the circumferential direction of the rotor core 21.

Therefore, the lubricating oil refrigerant or the like that has entered the communication path 1 3 4 flows in the communication path 1 3 4 in the radial direction of the rotor core 2 1. After that, the lubricating oil refrigerant enters the discharge path 1 3 5. The refrigerant or lubricating oil that has entered the discharge path 1 3 5 flows in the circumferential direction of the rotor core 21 while cooling the axial end surfaces of the permanent magnets 2 2 A and 2 2 B. Thereafter, lubricating oil and refrigerant are discharged from the outlet 3 3 a.

Here, the discharge port 3 3 a is defined both on the front side in the rotation direction P and on the rear side in the rotation direction P with respect to each communication path 1 3 4.

For this reason, for example, when driving of the rotating electrical machine starts and the rotor 20 starts to rotate in the rotation direction P, the refrigerant from the supply ports 1 3 1 A and 1 3 1 B in FIG. The lubricating oil is discharged from the discharge port 3 3 a 2 located on the rear side in the rotation direction P with respect to the communication path 1 3 4 A. At this time, for example, in the example shown in FIG. 3, the axial end surface of the permanent magnet 22 A is cooled by the lubricating oil or refrigerant. On the other hand, when the rotor 20 decelerates, for example, the refrigerant from the communication path 1 3 4 A is lubricated to the front side in the rotational direction P with respect to the communication path 1 3 4 A. It is discharged from the located outlet 3 3 a 1. At this time, the permanent magnet 2 2 B located on the discharge port 3 3 a 1 side is cooled. Here, since the rotating electrical machine accelerates or decelerates, it is discharged from at least one of the discharge ports 3 3 a 1 and 3 3 a 2 and cools the axial end surfaces of the permanent magnets 2 2 A and 2 2 B. can do.

The axial end surface of the permanent magnet 22 and the end plate 23 are separated from each other, and the end plate 23 is made of a metal material such as aluminum, for example. In this way, by separating the metal end plate 23 and the permanent magnet 22 from each other, it is possible to suppress the generation of eddy currents generated in the end plate 23 during driving of the rotating electrical machine.

One projecting part 1 3 3 A and the projecting part 1 3 3 A adjacent to the projecting part 1 3 3 A in the circumferential direction are connected to each other, and are located at the outer peripheral edge of the annular part 1 3 3 B The root portion 1 3 3 C extends in the circumferential direction of the rotor core 21.

Then, the side surfaces 1 3 6 a and 1 3 6 b of the adjacent protrusions 1 3 3 A are arranged so that the circumferential distance of the rotor core 21 increases toward the outer side in the radial direction of the rotor core 21. It is curved smoothly.

Therefore, the lubricating oil or refrigerant that has entered the path 3 3 from the supply ports 1 3 1 A and 1 3 1 B flows through the communication path 1 3 4 and can be discharged from the discharge port 3 3 a. ing.

(Embodiment 2)

A rotating electrical machine according to the second embodiment of the present invention will be described with reference to FIG. 1, FIG. 4, and FIG. Note that the same or corresponding components as those shown in FIGS. 1 to 3 are given the same reference numerals and description thereof is omitted.

FIG. 4 is a cross-sectional view showing the rotor 20 of the rotating electrical machine according to the second embodiment of the present invention, and FIG. 5 is an enlarged view of a part of FIG.

Here, the end plate 2 3 is formed on the top plate portion 1 2 4 and the top plate portion 1 2 4, formed on the outer peripheral edge portion of the path defining portion 1 4 4 and the top plate portion 1 2 4, and the rotor core 2 1 and a peripheral wall portion 1 2 3 depending on the axial end face.

As shown in FIG. 5, the path defining portion 1 4 4 is located around the rotary shaft 10, and an annular portion 1 4 4 B that contacts the axial end surface of the rotor core 2 1, and this annular portion 1 4 4 B A plurality of protrusions 14 4 A are formed on the outer periphery of the rotor core 21 at intervals, and protrude in the radial direction of the rotor core 21. Then, the projecting portion 14 4 A and the peripheral wall portion 1 2 3 are in contact with the axial end surface of the rotor core 21, so that the lubrication that has entered the through hole 31 in the axial end surface of the rotor core 21 is performed. Routes 43 for discharging oil and refrigerant to the outside are defined.

Here, in the opening of each through hole 31, a supply port 14 1 is defined in part by a protruding portion 14 4 A and an annular portion 14 4 B.

Here, the protrusion 1 4 4 A is a first side portion 1 4 5 that extends radially outward from a portion of the root of the protrusion 1 4 4 A located on the front side in the rotational direction P. b and an inclined portion 1 4 5 a connected to the end of this first side portion 1 4 5 b and inclined toward the rear side in the rotational direction P as it goes radially outward, and the inclined portion 1 4 5 a and a second side portion 1 4 5 c that extends toward the annular portion 1 4 4 B. And between the inclined portion 1 45 5 a and the peripheral wall portion 1 2 3, the discharge path that inclines radially outward toward the rear side in the rotational direction P and reaches the discharge port 3 3 a 2 1 4 5 is specified. Here, the portion located between the inclined portion 1 4 5 a and the peripheral wall portion 1 2 3 is the permanent magnet 2

2 A and 2 2 B are arranged.

For this reason, when the rotor 20 accelerates in the rotational direction P, the lubricating oil refrigerant or the like accumulated in the through hole 3 1 is supplied from the supply port 1 4 1 to the supply port 1 4 1. The direction of rotation P passes through the discharge path 1 4 5 located on the rear side, and the lubricating oil or refrigerant is discharged from the discharge port 3 3 a 2. At this time, the axial end face of the permanent magnet 2 2 is cooled when passing through the discharge path 1 4 5.

Further, when the rotor 20 decelerates, the lubricating oil or refrigerant accumulated in the through hole 3 1 enters the path 4 3 from the supply port 1 4 1 and is guided to the first side 1 4 5 c. And discharged from the outlet 3 3 a 1. Even when discharged in this way, the lubricating oil or refrigerant cools the axial end surface of the permanent magnet 22.

Thus, also in the rotating electrical machine according to the second embodiment, since the lubricating oil and refrigerant in each through hole 31 can be discharged, the occurrence of variation in the weight balance of the rotor core 21 can be suppressed. Can do.

(Embodiment 3) Embodiment 3 according to the present invention will be described with reference to FIG. 1, FIG. 6, and FIG. Note that the same or corresponding components as those shown in FIGS. 1 to 5 are denoted by the same reference numerals and description thereof is omitted.

FIG. 6 is a cross-sectional view of the rotor of the rotating electrical machine according to the third embodiment of the present invention, and FIG. 7 is an enlarged view of a part of FIG.

As shown in FIGS. 1 and 6, the end plate 2 3 includes a top plate portion 1 2 4 and a peripheral wall portion 1 that hangs from the peripheral portion of the top plate portion 1 2 4 toward the axial end surface of the rotor core 21. 2 and 3.

A path defining portion 15 3 that defines a path 53 on the axial end surface of the rotor core 21 is formed on the side surface of the end plate 23 that faces the axial end surface of the rotor core 21.

The path defining portion 15 3 includes an annular portion 15 3 B formed so as to cover a portion of the end surface in the axial direction of the rotor core 21 located around the rotary shaft 10, and the annular portion 15 3 3. A projecting portion 1 5 3 A that is provided continuously with the outer peripheral flange of B and projects outward in the radial direction of the rotor core 21.

The protruding portion 15 3 A extends so as to cover the upper surface of the partition wall 70 among the axial end surfaces of the rotor core 21. For this reason, it is possible to suppress the partition wall 70 from being deformed by the stress generated in the partition wall 70 when the rotor 20 is rotating. In the rotating electrical machine according to the third embodiment, the end face of the permanent magnet 22 can be cooled when the refrigerant in the through hole 31 is discharged.

As described above, the embodiment of the present invention has been described. However, it should be considered that the embodiment disclosed herein is illustrative and non-restrictive in every respect. 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. Industrial applicability

The present invention is suitable for a rotating electrical machine.

Claims

The scope of the claims

1. Annular stator (1 2),

A rotor (20) inserted into the stator (12) and rotatably supported; a magnet (22) mounted in a magnet receiving portion formed in the rotor (20); and the rotor (20) An end plate (23) provided on the axial end face, and

A hole portion (31) extending in the axial direction of the rotor (20) is formed at a position away from the magnet receiving portion of the rotor (20),

A path that passes from the opening of the hole (31) to the axial end surface of the magnet (22) (33) ί At least one of the axial end surface of the rotor (20) and the end plate (23) Specified by

A rotating electrical machine in which a discharge port communicating with the path (33) is formed by at least one of an axial end surface of the rotor (20) and the end plate (23).

2. The rotating electrical machine according to claim 1, wherein the hole (31) is positioned on a rotation center side of the rotor (20) with respect to the magnet (22).

3. The rotating electrical machine according to claim 1, wherein the discharge port is located at an outer peripheral edge portion of the rotor (20).

4. The end plate (23) includes a guide portion (1 3) capable of guiding the refrigerant supplied from the hole (3 1) into the path (3 3) to the end surface of the magnet (22).

The rotating electrical machine according to claim 1, comprising 3).

5. The end plate (23) closes a part of the opening of the hole (31) and defines a part of the opening as a circulation port through which the refrigerant can flow. The rotary electric machine according to claim 1, wherein the rotary electric machine is provided at a position shifted in a circumferential direction of the rotor (20) with respect to the magnet (22).

6. The opening according to claim 1, wherein the opening of the hole is formed so that a length in a circumferential direction increases from a radially inner side of the rotor (20) toward a radially outer side. The rotating electrical machine described.