JP6940965B2 - IPM rotor and rotary machine - Google Patents

Description

The present invention relates to an IPM rotor and a rotary electric machine.

Conventionally, an IPM (Interior Permanent Magnet) rotor is known as a rotor used in a rotary electric machine. An IPM rotor is a rotor in which a magnet is embedded in a rotor core. The IPM rotor includes a rotor core, a slot provided in the rotor core along the axial direction, and a magnet fixed in the slot.

As a method of fixing the magnet, for example, a method of fixing the magnet in the slot by injecting an adhesive between the slot and the magnet and curing it, or a method of fixing the magnet in the slot by molding with a resin material. There is.

However, these methods are costly because they require an injection step and a curing step of an adhesive or a resin material.
Therefore, a method of fixing a magnet in a slot without using an adhesive or a resin material has been proposed (see, for example, Patent Document 1). In the IPM rotor of Patent Document 1, the magnet is fixed to the outer peripheral side in the slot by pressing the inner peripheral side of the magnet with an urging member via a cushioning member.

Japanese Unexamined Patent Publication No. 2013-070471

However, since the IPM rotor of Patent Document 1 uses a plurality of members (buffering member and urging member) for fixing the magnet in the slot, there is room for further improvement in terms of cost.

Therefore, the present invention has been made in view of the above circumstances, and an object of the present invention is to provide an IPM rotor and a rotary electric machine capable of fixing a magnet in a slot at a low cost.

In order to solve the above problems, the IPM rotor according to claim 1 of the present invention (for example, the IPM rotor 7 of the embodiment described later) has a rotor core (for example, the rotor core 21 of the embodiment described later) and the axial direction of the rotor core. A slot provided in the rotor core (for example, slot 35 of the embodiment described later) and a magnet arranged in the slot (for example, the embodiment described later) along the axial direction Z of the embodiment described later. 23, 101, 105) and the inner peripheral side of the slot and the inner peripheral side of the magnet, and the inner peripheral side of the magnet is pressed by an elastic force to push the magnet into the slot. (For example, the pressing member 25, 75, 81, 83, 85, 87, 91, 93 of the embodiment described later) is provided , and the pressing member is arranged in the slot. It has a plurality of projecting portions (for example, a plurality of projecting portions 43, 77 of the embodiment described later) that come into contact with the magnet in the state of being in contact with the magnet, and a space portion (for example, a space portion of the embodiment described later) is provided between adjacent projecting portions. A space portion S) is provided, and the magnet is divided into at least one of the axial direction and the circumferential direction of the rotor core (for example, the circumferential direction θ of the embodiment described later) (for example, a plurality of divided magnets (for example, described later). The plurality of projecting portions of the pressing member press the inner peripheral side of the plurality of the dividing magnets, and the space portion is between the adjacent dividing magnets. is characterized in Rukoto disposed at a position corresponding to.

The IPM rotor according to claim 2 is characterized in that the space portion forms a passage (for example, the passage Sa of the embodiment described later) through which a cooling medium (for example, the cooling medium W of the embodiment described later) flows. There is.

The IPM rotor according to claim 3 is characterized in that the pressing member is formed in a wavy shape, and a plurality of the protruding portions forming the waveform press the inner peripheral side of the magnet. ..

The IPM rotor according to claim 4 is characterized in that the pressing member is formed so as to be thinned from the outside to the inside of the slot while being arranged in the slot.

Further, the rotary electric machine according to claim 5 (for example, the rotary electric machine 1 of the embodiment described later) is characterized by including the IPM rotor described above.

The rotary electric machine according to claim 6 includes the IPM rotor described above, and the IPM rotor is a pair of end face plates arranged in contact with both end faces of the rotor core of the IPM rotor (for example, the embodiment described later). It has a pair of end face plates 61, 61) of the form and a shaft passing through the rotation center of the rotor core (for example, the shaft 9 of the embodiment described later), and the shaft has a first passage (for example, a shaft 9 through which the cooling medium flows). For example, the first passage 53) of the embodiment described later is provided along the axial direction, and one end side is provided in the first passage between one of the pair of end face plates and one of the both end faces of the rotor core. A second passage is provided through which the other end communicates with the space portion of the rotor core, and one end side is provided in the space portion between the other of the pair of end face plates and the other of the both end faces of the rotor core. It is characterized in that a third passage (for example, the third passage 57 of the embodiment described later) is provided so that the other end side communicates with the outside of the IPM rotor.

In the IPM rotor according to claim 1 of the present invention, a magnet is fixed in a slot by using a pressing member. Therefore, the IPM rotor according to claim 1 can fix the magnet in the slot by reducing the number of member points as compared with the conventional IPM rotor. Therefore, the IPM rotor according to claim 1 can fix the magnet in the slot at a low cost.
Further, the pressing member was formed so that a space portion was formed in the slot. Therefore, in the IPM rotor according to claim 1, the magnet easily dissipates heat. Therefore, the IPM rotor according to claim 1 can suppress the cost and the temperature rise of the magnet.
Further, the magnet is composed of a plurality of divided magnets divided in at least one of the axial direction and the circumferential direction, and the pressing member is a magnet by pressing the inner peripheral side of the divided magnet with a plurality of protruding portions. The inner peripheral side of the magnet was pressed as a whole. Therefore, the pressing member can stably press the split magnet with one pressing member. Therefore, in the IPM rotor according to claim 1, even when the magnet is divided, the cost can be further suppressed and the magnet can be stably fixed in the slot.

In the IPM rotor according to claim 2 of the present invention, the space portion forms a passage through which the cooling medium flows. Therefore, the IPM rotor according to claim 2 can effectively cool the magnet by passing oil, air, or the like as a refrigerant medium through a space portion through which the cooling medium flows. .. Therefore, the IPM rotor according to claim 2 can cool the magnet at a low cost.

In the IPM rotor according to claim 3 of the present invention, the pressing member is formed in a wavy shape, and a plurality of protruding portions forming the waveform press the inner peripheral side of the magnet as a whole. Therefore, the pressing member can stably press the magnet in a shape that is easy to manufacture. Therefore, the IPM rotor according to claim 3 can stably fix the magnet in the slot at a lower cost.

In the IPM rotor according to claim 4 of the present invention, the pressing member is formed so as to be thinned from the outside to the inside of the slot while being arranged in the slot. Therefore, in the IPM rotor according to claim 4 , the pressing member can be easily inserted and arranged in the slot at the time of manufacturing the IPM rotor. Therefore, the IPM rotor according to claim 4 can increase the manufacturing efficiency of the IPM rotor.

Since the rotary electric machine according to claim 5 of the present invention includes the above-mentioned IPM rotor, it is possible to provide a rotary electric machine capable of fixing a magnet in a slot at a low cost.

In the rotary electric machine according to claim 6 of the present invention, a first passage is provided in the shaft, a second passage is provided between one end face plate and one end face of the rotor core, and the other end face plate and the other end face of the rotor core are provided. A third passage was provided between the end face and the end face. As a result, the cooling medium flowing through the first passage enters the second passage when the rotor core rotates, flows through the second passage, the passage which is the space portion of the rotor core, and the third passage, and is discharged to the outside of the IPM rotor. As a result, the magnet is directly cooled by the cooling medium. Therefore, the rotary electric machine according to claim 6 can efficiently cool the magnet.

It is sectional drawing which shows the whole structure of the rotary electric machine which comprises the IPM rotor of the 1st Embodiment of this invention. It is an exploded perspective view of the IPM rotor of the first embodiment. It is a perspective view of the pressing member provided in the IPM rotor of the 1st Embodiment. It is sectional drawing which shows the state which the pressing member and magnet of 1st Embodiment are arranged in the slot of a rotor core. It is a perspective view of the pressing member provided in the IPM rotor of the 2nd Embodiment of this invention. It is sectional drawing which shows the state which the pressing member and magnet of the 2nd Embodiment are arranged in the slot of a rotor core. It is sectional drawing which shows the part which concerns on the cooling medium passage of the rotary electric machine of 2nd Embodiment. It is sectional drawing which shows the state which the pressing member and the magnet provided in the IPM rotor of the 3rd Embodiment of this invention are arranged in the slot of a rotor core. It is a perspective view of the pressing member of another embodiment of this invention. It is a perspective view of the pressing member of another embodiment of this invention. It is a perspective view of the pressing member of another embodiment of this invention. It is a perspective view of the pressing member of another embodiment of this invention. It is a perspective view of the pressing member of another embodiment of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(First Embodiment)
FIG. 1 is a cross-sectional view showing the overall configuration of a rotary electric machine including the IPM rotor according to the first embodiment of the present invention.
As shown in FIG. 1, the rotary electric machine 1 includes a case 3, a stator 5, an IPM rotor 7, and a shaft 9. The rotary electric machine 1 is a traveling motor mounted on a vehicle such as a hybrid vehicle or an electric vehicle. However, the configuration of this embodiment is not limited to the above example, and can be applied to motors for other purposes such as power generation motors mounted on vehicles. Further, the configuration of the present embodiment is a rotary electric machine other than that mounted on a vehicle, and can be applied to all so-called rotary electric machines including a generator.

The case 3 is formed in a cylindrical shape for accommodating, for example, the stator 5 and the IPM rotor 7. The stator 5 is formed in an annular shape and is attached to, for example, the inner peripheral surface of the case 3. The stator 5 has a stator core 11 and a winding 13 attached to the stator core 11, and causes a rotating magnetic field to act on the IPM rotor 7. The IPM rotor 7 has, for example, a rotor core 21 and a magnet 23 attached to the rotor core 21, and is rotationally driven inside the stator 5. The shaft 9 is connected to the IPM rotor 7 and outputs the rotation of the IPM rotor 7 as a driving force.

Hereinafter, the axial direction Z, the radial direction R, and the circumferential direction θ (see FIG. 2) of the rotor core 21 (stator core 11 and rotary electric machine 1) are defined. The axial direction Z of the rotor core 21 is a direction along the rotation center axis C of the shaft 9. The radial direction R of the rotor core 21 is a direction orthogonal to the rotation center axis C. The circumferential direction θ of the rotor core 21 is a direction of rotation around the rotation center axis C.

FIG. 2 is an exploded perspective view of the IPM rotor of the first embodiment.
As shown in FIG. 2, the IPM rotor 7 includes a rotor core 21, a magnet 23, and a pressing member 25.
The rotor core 21 is formed in an annular shape. The rotor core 21 is formed by laminating a plurality of electromagnetic steel sheets along the axial direction Z. A rotor core through hole 31 is formed at the center of rotation (center portion) of the rotor core 21. A shaft 9 is fixed to the rotor core through hole 31 by, for example, press fitting.

A plurality of slot groups 33 are provided on the outer peripheral side of the rotor core through hole 31. The plurality of slot groups 33 are arranged at predetermined intervals in the circumferential direction θ. Each slot group 33 is composed of two slots 35. The two slots 35 are arranged so as to be coupled in the circumferential direction θ. Each slot 35 is formed as a hole penetrating the rotor core 21 along the axial direction Z. The two slots 35 are formed in a substantially V shape when viewed from the axial direction Z in a state of being connected to each other.

The magnet 23 is a rare earth magnet containing, for example, neodymium, and is formed in a rectangular shape. The magnet 23 is composed of a plurality of divided magnets 37 divided in the axial direction Z. In each slot 35, a plurality of dividing magnets 37 are inserted and arranged in parallel in the axial direction Z.

FIG. 3 is a perspective view of a pressing member provided on the IPM rotor of the first embodiment.
The pressing member 25 is inserted and arranged in each slot 35 on the inner peripheral side of the magnet 23 (see FIG. 2).
As shown in FIG. 3, the pressing member 25 is made of a non-magnetic material having an elastic force. Examples of the non-magnetic material having elastic force include SUS (stainless steel) and resin materials. The pressing member 25 is formed in a plate shape extending in the axial direction Z.

Specifically, the pressing member 25 includes a flat plate portion 41 and a plurality of protruding portions 43.
The flat plate portion 41 is formed in a flat plate shape extending in the axial direction Z.
The plurality of projecting portions 43 are provided on the main surface of the flat plate portion 41 on the outer peripheral side at intervals along the axial direction Z. Each protruding portion 43 is formed so as to protrude from the upper surface of the flat plate portion 41. Each protrusion 43 has a semicircular cross-sectional shape as viewed from the circumferential direction θ. The protruding portion 43 comes into contact with the magnet 23 in a state of being arranged in the slot 35.

FIG. 4 is a cross-sectional view showing a state in which the pressing member and the magnet of the first embodiment are arranged in the slots of the rotor core.
As shown in FIG. 4, the magnet 23 is composed of a plurality of divided magnets 37 divided in the axial direction Z in the slot 35.

The pressing member 25 is arranged between the inner side surface 47 on the inner peripheral side in the slot 35 and the inner side surface 49 on the inner peripheral side of the plurality of dividing magnets 37.
The pressing member 25 presses the inner side surface 49 on the inner peripheral side of the plurality of split magnets 37 with an elastic force. As a result, the pressing member 25 is fixed in a state where the plurality of projecting portions 43 are in contact with the plurality of dividing magnets 37 and the dividing magnets 37 are pressed against the outer surface 45 on the outer peripheral side in the slot 35. The pressing member 25 presses the inner side surface 49 on the inner peripheral side of the split magnet 37 with a plurality of protruding portions 43. In the present embodiment, the three projecting portions 43 abut and press against one split magnet 37. A space portion S is provided between the adjacent protrusions 43.

(Operation of the first embodiment)
The IPM rotor 7 of the present embodiment includes a rotor core 21, a slot 35 provided in the rotor core 21, and a magnet 23 arranged in the slot 35. Further, the IPM rotor 7 of the first embodiment includes a pressing member 25 arranged between the inner peripheral side in the slot 35 and the inner peripheral side of the magnet 23. The pressing member 25 presses the inner peripheral side of the magnet 23 with an elastic force to fix the magnet 23 to the outer peripheral side in the slot 35.
As described above, in the IPM rotor 7 of the present embodiment, the magnet 23 is fixed in the slot 35 by using the pressing member 25. Therefore, the IPM rotor 7 of the present embodiment can fix the magnet 23 in the slot 35 by reducing the number of member points as compared with the conventional IPM rotor. Therefore, in the IPM rotor 7 of the present embodiment, the magnet 23 can be fixed in the slot 35 at a low cost.

Further, the IPM rotor 7 of the present embodiment has a plurality of protruding portions 43 that come into contact with the magnet 23 in a state where the pressing member 25 is arranged in the slot 35, and a space portion S is provided between the adjacent protruding portions 43. Is provided.
According to this configuration, in the IPM rotor 7, the magnet 23 easily dissipates heat. Therefore, the IPM rotor 7 of the present embodiment can suppress the cost and the temperature rise of the magnet 23.

Further, the IPM rotor 7 of the present embodiment is composed of a plurality of split magnets 37 in which the magnet 23 is divided in the axial direction Z, and the plurality of protrusions 43 of the pressing member 25 are the inner circumferences of the plurality of split magnets 37. Pressing the side.
According to this configuration, the pressing member 25 can stably press the plurality of split magnets 37 with one pressing member 25. Therefore, in the IPM rotor 7 of the present embodiment, even when the magnet 23 is divided, the cost can be further suppressed and the magnet 23 can be stably fixed in the slot 35.

Further, the rotary electric machine 1 of the present embodiment includes the IPM rotor 7 described above.
According to this configuration, it is possible to provide the rotary electric machine 1 capable of fixing the magnet 23 in the slot 35 at a low cost.

(Second Embodiment)
Subsequently, the IPM rotor and the rotary electric machine of the second embodiment will be described.
In the pressing member 25 of the first embodiment, the pressing member 25 includes a flat plate portion 41 and a plurality of projecting portions 43. However, the shape of the pressing member 25 is not limited to the first embodiment.
FIG. 5 is a perspective view of a pressing member provided on the IPM rotor of the second embodiment.
FIG. 6 is a cross-sectional view showing a state in which the pressing member and the magnet of the second embodiment are arranged in the slots of the rotor core.

As shown in FIG. 5, the pressing member 75 is made of a non-magnetic material having an elastic force, similarly to the pressing member 25 of the first embodiment. The pressing member 75 extends in the axial direction Z, and the cross-sectional shape seen from the axial direction Z is formed in a wavy shape. The waveform of the pressing member 75 is composed of a plurality of protruding portions 77.

As shown in FIG. 6, the magnet 101 is composed of a plurality of divided magnets 103 divided in the circumferential direction θ. The pressing member 75 is arranged between the inner peripheral side in the slot 35 and the inner peripheral side of the plurality of dividing magnets 103. The pressing member 75 presses the inner peripheral side of the plurality of split magnets 103 with an elastic force. The pressing member 75 fixes the plurality of dividing magnets 103 in a state of being pressed against the outer surface 45 on the outer peripheral side in the slot 35. A space portion S is provided between the adjacent protrusions 77. Although the details will be described later, the space portion S forms a passage Sa through which the cooling medium W such as oil flows.

FIG. 7 is a cross-sectional view showing a portion related to the cooling medium passage of the rotary electric machine of the second embodiment.
The rotary electric machine 1 shown in FIG. 7 includes an IPM rotor 7 according to the second embodiment. The IPM rotor 7 includes a pair of end face plates 61, 61.
The pair of end face plates 61, 61 are arranged in contact with both end faces 29, 29 of the rotor core 21. The pair of end face plates 61, 61 are used as a retainer for the magnet 101 fixed in the slot 35 of the rotor core 21. Each end face plate 61 is formed in an annular shape. An end face plate through hole 63 is formed at the center of rotation of each end face plate 61. The shaft 9 penetrates and is fixed to the end face plate through hole 63.

The cooling medium W for cooling the rotary electric machine 1 passes through the cooling medium passage 51. The cooling medium passage 51 communicates with the first passage 53, the second passage 55 communicating with the first passage 53, the space portion S of the rotor core 21 communicating with the second passage 55, and the space portion S of the rotor core 21. It is provided with three passages 57. The first passage 53 is provided in the shaft 9 along the axial direction Z. A cooling medium W conveyed from an oil pump (not shown) is supplied to the first passage 53.

The second passage 55 is provided between one end face plate 61 and one end face 29 of the rotor core 21. One end side of the second passage 55 penetrates the peripheral wall 15 of the shaft 9 and communicates with the first passage 53. The other end side of the second passage 55 communicates with the space portion S of the rotor core 21.

More specifically, the second passage 55 is formed of a gangway 67 and a connecting passage 69. The gangway 67 is formed so as to penetrate the peripheral wall 15 of the shaft 9. The connecting path 69 is formed between one end face plate 61 and one end face 29. One end side of the connecting path 69 communicates with the gangway 67. The other end side of the connection path 69 communicates with the space portion S of the rotor core 21. The connecting path 69 is formed of a groove 71 and one end surface 29. The groove 71 is formed on the inner surface 65 of one end face plate 61 between the through-passage 67 and the space portion S of the rotor core 21. The inner surface 65 of one end plate 61 is in contact with one end surface 29 of the rotor core 21.

The third passage 57 is provided between the other end face plate 61 and the other end face 29 of the rotor core 21. One end side of the third passage 57 communicates with the space portion S of the rotor core 21. The other end side of the third passage 57 communicates with the outside of the rotor core 21 and the end face plate 61. The third passage 57 is formed from the groove 71 and the other end surface 29. The groove 71 is formed between the space portion S of the rotor core 21 and the outside on the inner surface 65 of the other end face plate 61. The inner surface 65 of the other end face plate 61 is in contact with the other end face 29 of the rotor core 21.

Next, a method of cooling the magnet 101 using the cooling medium passage 51 will be described.
When the cooling medium W is discharged from the pump, the cooling medium W is supplied to one end side of the first passage 53 and flows to the other end side of the first passage 53. When the IPM rotor 7 rotates, the cooling medium W passing through the first passage 53 enters one end side of the second passage 55 due to the centrifugal force due to the rotation, and enters the second passage 55, the space portion S of the rotor core 21, and the third. It flows in the order of the passage 57 and goes out. As a result, the cooling medium W touches the magnet 101 in the slot 35 to directly cool the magnet 101. The cooling medium W that has come out to the outside scatters on the stator 5 and cools the stator 5.

(Action of the second embodiment)
Next, the operations of the IPM rotor 7 and the rotary electric machine 1 of the second embodiment will be described.
According to the second embodiment, the space portion S of the IPM rotor 7 forms a passage Sa through which the cooling medium W passes. Therefore, the IPM rotor 7 can effectively cool the magnet 101 by allowing oil, air, or the like to flow as the refrigerant medium W through the space S, which is the passage Sa through which the cooling medium W passes. become. Therefore, the IPM rotor 7 of the second embodiment can cool the magnet 101 at a low cost.

Further, according to the IPM rotor 7 of the second embodiment, the pressing member 75 is formed in a wave shape, and the plurality of protruding portions 77 forming the waveform press the inner peripheral side of the magnet 101 as a whole. bottom. Therefore, the pressing member 75 can stably press the magnet 101 in a shape that is easy to manufacture. Therefore, the IPM rotor 7 of the second embodiment can stably fix the magnet 101 in the slot 35 at a lower cost.

Further, according to the IPM rotor 7 of the second embodiment, the magnet 101 is composed of a plurality of divided magnets 103 divided in the circumferential direction θ, and the pressing member 75 is formed by a plurality of protruding portions 77 of each divided magnet 103. By pressing the inner peripheral side of the magnet 101, the inner peripheral side of the magnet 101 is pressed as a whole. Therefore, the pressing member 75 can stably press each dividing magnet 103 with one pressing member 75. Therefore, in the IPM rotor 7 of the second embodiment, even when the magnet 101 is divided, the cost can be further suppressed and the magnet 101 can be stably fixed in the slot 35.

Further, according to the rotary electric machine 1 of the second embodiment, the shaft 9 is provided with the first passage 53, the second passage 55 is provided between one end face plate 61 and one end face 29 of the rotor core 21, and the other end face plate 61 is provided. A third passage 57 is provided between the end face plate 61 and the other end face 29 of the rotor core 21. As a result, the cooling medium W flowing through the first passage 53 enters the second passage 55 when the rotor core 21 rotates, and flows through the second passage 55, the passage Sa which is the space S of the rotor core 21, and the third passage 57, and IPM. It is discharged to the outside of the rotor 7. As a result, the magnet 101 is directly cooled by the cooling medium W. Therefore, the rotary electric machine 1 according to the second embodiment can efficiently cool the magnet 101.

(Third Embodiment)
FIG. 8 is a cross-sectional view showing a state in which the pressing member and the magnet provided in the IPM rotor according to the third embodiment of the present invention are arranged in the slots of the rotor core.
As shown in FIG. 8, one magnet 105 is arranged in the slot 35. The pressing member 81 is arranged between the inner peripheral side in the slot 35 and the inner peripheral side of the magnet 105. The pressing member 81 is made of a non-magnetic material having an elastic force like the pressing member 25 of the first embodiment. The pressing member 81 is formed so as to become thinner from the outside to the inside (from left to right in FIG. 8) of the slot 35. In other words, the pressing member 81 is formed in a tapered shape in cross section. The pressing member 81 presses the inner peripheral side of the magnet 105 with an elastic force at a portion on the base end side (left portion in FIG. 8) to fix the magnet 105 to the outer peripheral side in the slot 35.

(Action of Third Embodiment)
Next, the operation of the IPM rotor of the third embodiment will be described.
In the IPM rotor of the third embodiment, the pressing member 81 is formed so as to be tapered from the outside to the inside of the slot 35 in a state of being arranged in the slot 35. This makes it possible for the IPM rotor 7 to easily insert and arrange the pressing member 81 in the slot 35 during its manufacture. Therefore, the IPM rotor of the third embodiment can improve the manufacturing efficiency. Since the other actions and effects are as described in the first embodiment, the description thereof will be omitted here.

The present invention is not limited to the above-described embodiment described with reference to the drawings, and various modifications can be considered within the technical scope thereof.

In the above-described embodiment, the case where the pressing member has a wavy shape and the case where the cross section has a tapered shape has been described, but the shape is not limited to the above-described embodiment. Therefore, the pressing member may have other shapes shown in FIGS. 9 to 13, for example. This will be described in detail below.

9 and 10 are perspective views of the pressing member of another embodiment of the present invention.
The pressing member 83 shown in FIG. 9 is formed in a cylindrical shape extending in the axial direction Z.
The pressing member 85 shown in FIG. 10 is formed in a rectangular cylindrical shape extending in the axial direction Z.
These pressing members 83 and 85 are formed so as to totally press the inner peripheral side of the magnet 23 (see FIG. 4) with an elastic force in a deformed state. Therefore, these pressing members 83 and 85 can stably press each of the dividing magnets 37 in a shape that is easy to manufacture. Therefore, the IPM rotor using these pressing members 83 and 85 can stably fix the magnet 23 in the slot 35 at a low cost even when the magnet 23 is divided. Further, these pressing members 83 and 85 can be easily deformed because they are formed in a hollow shape. Therefore, when manufacturing an IPM rotor using these pressing members 83, 85, the pressing members 83, 85 can be easily inserted into the slot 35. Therefore, the IPM rotor can improve the manufacturing efficiency even if these pressing members 83 and 85 are used.

11 to 13 are perspective views of a pressing member according to another embodiment of the present invention.
The pressing member 87 shown in FIG. 11 is formed in a columnar shape extending in the axial direction Z.
The pressing member 91 shown in FIG. 12 is formed in a prismatic shape extending in the axial direction Z.
The pressing member 93 shown in FIG. 13 is formed in a semi-cylindrical shape extending in the axial direction Z.
These pressing members 87, 91, 93 are formed so as to totally press the inner peripheral side of the magnet 23 (see FIG. 4) with an elastic force. Therefore, these pressing members 87, 91, and 93 can stably press each of the dividing magnets 37 in a shape that is easy to manufacture. Therefore, the IPM rotor using these pressing members 87, 91, 93 can stably fix the magnet 23 in the slot 35 at a low cost even when the magnet 23 is divided.

In the pressing member 25 of the first embodiment, the pressing member 75 of the second embodiment, and the pressing members 83, 85, 87, 91, 93 of the other embodiments shown in FIGS. 9 to 13, the magnets are divided. It was applied in the case, but it can also be applied when the magnets are not divided (when the number of magnets in the slot is one).

In addition, it is possible to replace the components in the above-described embodiment with well-known components as appropriate without departing from the spirit of the present invention.

1 Rotating electric machine 7 IPM rotor 9 Shaft 21 Rotor core 23,101,105 Magnet 25,75,81,83,85,87,91,93 Pressing member 29 End face 35 of rotor core Slot 37,103 Dividing magnet 43,77 Protruding part 53 First passage 55 Second passage 57 Third passage 61 End face plate W Cooling medium S Space part Sa Passage Z Axial direction θ Circumferential direction

Claims (6)

With the rotor core
Slots provided in the rotor core along the axial direction of the rotor core,
The magnets placed in the slot and
A pressing member arranged between the inner peripheral side of the slot and the inner peripheral side of the magnet and pressing the inner peripheral side of the magnet with an elastic force to fix the magnet to the outer peripheral side of the slot. When,
Equipped with a,
The pressing member has a plurality of protrusions that come into contact with the magnet while being arranged in the slot.
A space is provided between the adjacent protrusions.
The magnet is composed of a plurality of split magnets that are split in at least one of the axial direction and the circumferential direction of the rotor core.
A plurality of the protrusions of the pressing member is configured to press the inner circumferential side of the plurality of the divided magnet, the space portion is disposed at a position corresponding to between the divided magnet adjacent to said Rukoto IPM Rotor. The IPM rotor according to claim 1 , wherein the space portion forms a passage through which a cooling medium flows. The IPM rotor according to claim 2 , wherein the pressing member is formed in a wavy shape, and a plurality of the protruding portions forming the waveform press the inner peripheral side of the magnet. The IPM rotor according to claim 1, wherein the pressing member is formed so as to be thinned from the outside to the inside of the slot while being arranged in the slot. A rotary electric machine provided with the IPM rotor according to any one of claims 1 to 4. The IPM rotor according to any one of claims 2 or 3 is provided.
The IPM rotor
A pair of end face plates arranged in contact with both end faces of the rotor core of the IPM rotor,
A shaft passing through the center of rotation of the rotor core and
Have,
The shaft is provided with a first passage through which the cooling medium flows along the axial direction.
Between one of the pair of end face plates and one of the both end faces of the rotor core, a second passage is provided in which one end side communicates with the first passage and the other end side communicates with the space portion of the rotor core. ,
Between the other of the pair of end face plates and the other of the both end faces of the rotor core, a third passage is provided, one end side communicating with the space portion and the other end side communicating with the outside of the IPM rotor. A rotating electric machine characterized by that.

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