JP7217791B1 - Rotating electric machine - Google Patents

Abstract

A rotating electrical machine capable of positioning and fixing permanent magnets in a shorter time. A rotary electric machine includes a rotor (20) having a rotor core (21) formed with magnet insertion holes (22) and permanent magnets (30) inserted into the magnet insertion holes (22), the rotor core (21) facing the magnet insertion holes (22). and a second inner wall surface 22b facing the first inner wall surface 22a with the magnet insertion hole 22 interposed therebetween. A projecting first protrusion 23 is formed, the first protrusion 23 is formed at one end of the first inner wall surface 22a in the axial direction of the rotor 20, and the permanent magnet 30 is formed at least on the second inner wall surface. 22b, the permanent magnet 30 has a first chamfered portion 32d facing the first convex portion 23, and when viewed in the axial direction, the first convex portion 23 is aligned with the first chamfered portion 32d. are placed overlapping each other. [Selection drawing] Fig. 3

Description

The present disclosure relates to a rotating electric machine including a rotor having a rotor core formed with magnet insertion holes and permanent magnets inserted into the magnet insertion holes.

Patent Literature 1 describes a magnet fixing device that fixes a magnet to each of a plurality of magnet insertion holes formed in a rotor core. This magnet fixing device includes a holding mechanism and a filling mechanism. The holding mechanism is configured to hold the rotor core rotatably while keeping the central axis of the rotor core horizontal with the magnet inserted into the magnet insertion hole. The filling mechanism is configured to fill a gap between the magnet insertion hole and the magnet with resin at a predetermined rotational angle position of the rotor core held by the holding mechanism.

The filling hole of the filling mechanism is provided, for example, at a position where resin is filled into the gap in the uppermost magnet insertion hole. In this case, resin is sequentially filled into the gaps in the magnet insertion holes that have reached the uppermost portion while the rotor core is rotationally displaced by the holding mechanism. As a result, the magnets are fixed in each magnet insertion hole in a state of being inwardly brought into contact with the wall surface on the radially inner side.

JP 2015-2582 A

When using the above-described magnet fixing device, in order to position and fix all the magnets in the magnet insertion holes, it is necessary to perform the resin filling operation the same number of times as the number of magnet insertion holes while rotationally displacing the rotor core. There is Therefore, there is a problem that it takes a long time to position and fix the magnet in the magnet insertion hole.

The present disclosure has been made to solve the problems described above, and an object thereof is to provide a rotating electrical machine that can position and fix permanent magnets in a shorter period of time.

A rotary electric machine according to the present disclosure includes a rotor having a rotor core formed with magnet insertion holes and permanent magnets inserted into the magnet insertion holes, the rotor core facing the magnet insertion holes. and a second inner wall surface facing the first inner wall surface with the magnet insertion hole interposed therebetween. is formed, the first protrusion is formed at one end of the first inner wall surface in the axial direction of the rotor, the permanent magnet is adhered to at least the second inner wall surface, The permanent magnet has a first chamfered portion facing the first convex portion, and the first convex portion is arranged to overlap the first chamfered portion when viewed in the axial direction. .

According to the present disclosure, it is possible to position and fix the permanent magnets in a shorter time.

1 is a perspective view showing a configuration of a rotating electric machine according to Embodiment 1; FIG. FIG. 2 is a diagram showing a configuration of a part of the rotor of the rotary electric machine according to Embodiment 1, viewed in the axial direction; FIG. 3 is a diagram showing a cut end face of the rotor in the III-III cross section of FIG. 2; It is a figure which expands and shows the IV section of FIG. FIG. 5 is a diagram showing a process of inserting permanent magnets into magnet insertion holes in the manufacturing process of the rotor of the rotary electric machine according to Embodiment 1; FIG. 5 is a diagram showing a process of inserting permanent magnets into magnet insertion holes in the manufacturing process of the rotor of the rotary electric machine according to Embodiment 1; FIG. 7 is a diagram showing the configuration of a rotor of a rotating electric machine according to Embodiment 2; FIG. 10 is a diagram showing a process of inserting permanent magnets into magnet insertion holes in the manufacturing process of the rotor of the rotary electric machine according to Embodiment 2; FIG. 10 is a diagram showing a step of laminating a third electromagnetic steel sheet in the manufacturing steps of the rotor of the rotary electric machine according to Embodiment 2; FIG. 10 is a diagram showing the configuration of a rotor of a rotating electric machine according to Embodiment 3; It is a figure which expands and shows the XI section of FIG. FIG. 6 is a diagram showing an example of the configuration of the rotor of the rotary electric machine according to Embodiments 1 to 3 when the first convex portion is viewed in the axial direction of the rotor; FIG. 8 is a diagram showing another example of the configuration of the rotor of the rotary electric machine according to Embodiments 1 to 3 when the first convex portion is viewed in the axial direction of the rotor; FIG. 10 is a diagram showing still another example of the configuration of the rotor of the rotating electric machine according to Embodiments 1 to 3 when the first convex portion is viewed in the axial direction of the rotor;

Embodiment 1.
A rotating electric machine according to Embodiment 1 will be described. In the present embodiment, an embedded magnet type permanent magnet synchronous motor is exemplified as the rotary electric machine. FIG. 1 is a perspective view showing the configuration of a rotating electric machine according to this embodiment. As shown in FIG. 1 , the rotating electric machine has a stator 10 and a rotor 20 . Stator 10 has a configuration in which a three-phase coil is wound around a stator core.

The rotor 20 is rotatably provided with respect to the stator 10 . The rotor 20 is fixed to a shaft 11 that serves as a rotating shaft. The rotor 20 has a rotor core 21 and a plurality of permanent magnets 30 . A plurality of magnet insertion holes 22 are formed in the rotor core 21 . Each permanent magnet 30 is inserted into each magnet insertion hole 22 .

In the following description, the direction along the axis of the shaft 11 may be referred to as "the axial direction of the rotor 20" or simply "the axial direction". In a cross section perpendicular to the axial direction of the rotor 20, the direction along the circumference centering on the axis of the shaft 11 may be referred to as the "circumferential direction of the rotor 20" or simply "circumferential direction". In the cross section, the direction along the radius of the rotor 20 may be called "radial direction of the rotor 20" or simply "radial direction".

FIG. 2 is a diagram showing a configuration of a part of the rotor of the rotary electric machine according to the present embodiment, viewed in the axial direction. FIG. 3 is a cut end view of the III-III cross section of FIG. The vertical direction in FIG. 3 represents the axial direction of the rotor 20 . The horizontal direction in FIG. 3 represents a direction perpendicular to a first inner wall surface 22a, which will be described later. 3 is parallel to the axial direction of the rotor 20 and perpendicular to the first inner wall surface 22a.

As shown in FIGS. 2 and 3 , the magnet insertion holes 22 extend along the axial direction of the rotor 20 . The magnet insertion holes 22 are formed through the rotor core 21 . In a cross section perpendicular to the axial direction of the rotor 20, the magnet insertion holes 22 are formed in a rectangular shape.

The rotor core 21 has a first inner wall surface 22a and a second inner wall surface 22b. Both the first inner wall surface 22 a and the second inner wall surface 22 b face the magnet insertion hole 22 . Both the first inner wall surface 22a and the second inner wall surface 22b are formed in a planar shape. The first inner wall surface 22a and the second inner wall surface 22b face each other with the magnet insertion hole 22 interposed therebetween. In a cross section perpendicular to the axial direction of the rotor 20 , the first inner wall surface 22 a and the second inner wall surface 22 b form long sides of the magnet insertion hole 22 .

Each of the first inner wall surface 22 a and the second inner wall surface 22 b is arranged to be inclined with respect to the radial direction of the rotor 20 . In the radial direction of the rotor 20, the first inner wall surface 22a is located inside the second inner wall surface 22b.

A first protrusion 23 is formed on the first inner wall surface 22a. The first protrusion 23 protrudes toward the magnet insertion hole 22 toward the second inner wall surface 22b. The first protrusion 23 is formed at one end of the first inner wall surface 22 a in the axial direction of the rotor 20 . The first protrusion 23 shown in FIG. 3 is formed at the lower end of the first inner wall surface 22a. The first convex portion 23 is formed in a rectangular shape in a cross section parallel to the axial direction of the rotor 20 and perpendicular to the first inner wall surface 22a. As will be described later, the first convex portion 23 is used for positioning the permanent magnet 30 within the magnet insertion hole 22 .

A protrusion such as the first protrusion 23 is not formed on the second inner wall surface 22b. That is, the second inner wall surface 22b is formed flat. The distance between the first convex portion 23 and the second inner wall surface 22b is narrower than the distance between the first inner wall surface 22a and the second inner wall surface 22b.

The rotor core 21 has a configuration in which a plurality of first electromagnetic steel sheets 24-1 and at least one second electromagnetic steel sheet 24-2 are laminated. In the following description, the plurality of first electromagnetic steel sheets 24-1 and at least one second electromagnetic steel sheet 24-2 may be collectively referred to as a plurality of electromagnetic steel sheets. The stacking direction of the plurality of electromagnetic steel sheets coincides with the axial direction of the rotor 20 .

The second electromagnetic steel sheet 24-2 is arranged on one end side of the plurality of electromagnetic steel sheets in the stacking direction of the plurality of electromagnetic steel sheets. A second electromagnetic steel sheet 24-2 shown in FIG. 3 is arranged at the lowest end of the plurality of electromagnetic steel sheets. That is, in the configuration shown in FIG. 3, one electromagnetic steel sheet at the lowest end is the second electromagnetic steel sheet 24-2, and a plurality of other electromagnetic steel sheets are the first electromagnetic steel sheets 24-1.

A rectangular opening 24a-1 is formed in each of the first electromagnetic steel sheets 24-1. A rectangular opening 24a-2 is formed in the second electromagnetic steel plate 24-2. The magnet insertion hole 22 is formed by arranging the opening 24a-1 and the opening 24a-2 so as to overlap each other in the stacking direction. The punched shape of the opening 24a-2 of the second electromagnetic steel plate 24-2 is different from the punched shape of the opening 24a-1 of the first electromagnetic steel plate 24-1. The second electromagnetic steel sheet 24-2 has the same configuration as the first electromagnetic steel sheet 24-1, except that the punched shape of the opening is different.

The first convex portion 23 is formed of a second electromagnetic steel plate 24-2. The first convex portion 23 of the present embodiment is formed by one second electromagnetic steel sheet 24-2 located on one end side of the plurality of electromagnetic steel sheets in the stacking direction. The first convex portion 23 may be formed by a plurality of second electromagnetic steel plates 24-2 adjacent to each other in the stacking direction.

The permanent magnet 30 has a rectangular parallelepiped shape extending along the axial direction of the rotor 20 . In a cross section perpendicular to the axial direction of rotor 20, permanent magnet 30 is formed in a rectangular shape. The permanent magnet 30 has a first side 30a and a second side 30b. Both the first side surface 30a and the second side surface 30b are formed in a planar shape. In a cross section perpendicular to the axial direction of the rotor 20 , each of the first side surface 30 a and the second side surface 30 b constitutes a long side of the permanent magnet 30 .

The distance between the first side surface 30a and the second side surface 30b is shorter than the distance between the first inner wall surface 22a and the second inner wall surface 22b. The distance between the first side surface 30a and the second side surface 30b corresponds to the thickness B of the permanent magnet 30, which will be described later. The distance between the first inner wall surface 22a and the second inner wall surface 22b corresponds to the width C of the magnet insertion hole 22, which will be described later.

The first side surface 30a faces the first inner wall surface 22a. The second side surface 30b faces the second inner wall surface 22b. The second side surface 30b is adhered to the second inner wall surface 22b via a resin layer (not shown). The resin layer is made of a resin that functions as an adhesive. The permanent magnet 30 is fixed in the magnet insertion hole 22 by bonding the second side surface 30b and the second inner wall surface 22b.

The permanent magnet 30 is adhered to at least the second inner wall surface 22b. In this embodiment, the permanent magnet 30 is adhered only to the second inner wall surface 22b. A gap 31 that serves as an air layer is formed between the first side surface 30a and the first inner wall surface 22a. A resin layer may be formed between the first side surface 30a and the first inner wall surface 22a. That is, the entire magnet insertion hole 22 may be filled with resin, not only between the second side surface 30b and the second inner wall surface 22b.

The permanent magnet 30 has chamfered portions 32a, 32b, 32c and 32d. The chamfered portions 32a, 32b, 32c, and 32d are formed at the four corners of the permanent magnet 30 in FIG. The chamfered portion 32 d faces the first convex portion 23 . The chamfered portion 32d is formed by obliquely shaving the side of the permanent magnet 30 that faces the first convex portion 23 . Hereinafter, the chamfered portion 32d may be referred to as a first chamfered portion.

Although four chamfered portions 32a, 32b, 32c, and 32d are shown in FIG. 3, all sides of the permanent magnet 30 may be chamfered. Alternatively, the chamfered portion may be provided only on the side of the permanent magnet 30 facing the first convex portion 23 . The permanent magnet 30 has at least a chamfered portion 32 d facing the first convex portion 23 . When viewed in the axial direction of the rotor 20, the chamfered portion 32d and the first convex portion 23 are arranged so as to overlap each other. As will be described later, the chamfered portion 32 d is used together with the first convex portion 23 for positioning the permanent magnet 30 within the magnet insertion hole 22 .

FIG. 4 is an enlarged view of part IV in FIG. As shown in FIG. 4, A is the projection height of the first protrusion 23 from the first inner wall surface 22a. Let B be the thickness of the permanent magnet 30 . Let C be the width of the magnet insertion hole 22 . Let D be the chamfering dimension of the chamfering portion 32d. The protrusion height A, thickness B, width C, and chamfer dimension D are all measured along the direction perpendicular to the first inner wall surface 22a, that is, the left-right direction in FIG. At this time, the relationship (CB)<A<(CB+D) is satisfied. Furthermore, it is desirable that the relationship A<D is satisfied.

When the permanent magnet 30 has a plurality of chamfered portions, the chamfered dimensions of the chamfered portions 32a, 32b, 32c, etc. that do not face the first convex portion 23 do not match the chamfered dimension D of the chamfered portion 32d. may

Next, the process of inserting the permanent magnets 30 into the magnet insertion holes 22 in the manufacturing process of the rotor 20 will be described. 5 and 6 are diagrams showing the process of inserting permanent magnets into the magnet insertion holes in the manufacturing process of the rotor of the rotary electric machine according to the present embodiment. FIG. 5 shows a cut end face corresponding to FIG. FIG. 6 shows a cut end face corresponding to FIG. The lower part of FIGS. 5 and 6 represents the vertical direction.

As shown in FIG. 5, in the step of inserting the permanent magnets 30 into the magnet insertion holes 22, the rotor core 21 is supported such that the axial direction is parallel to the vertical direction and the first protrusions 23 are positioned downward. be done. The permanent magnets 30 are vertically inserted into the magnet insertion holes 22 from above the rotor core 21 .

When the permanent magnets 30 are inserted into the magnet insertion holes 22, it is not necessary to accurately position the permanent magnets 30 with respect to the magnet insertion holes 22 in the horizontal direction of FIG. Therefore, the permanent magnet 30 may be inserted into the magnet insertion hole 22 along the first inner wall surface 22a, as shown in FIG.

As shown in FIG. 6 , when the permanent magnet 30 is inserted all the way into the magnet insertion hole 22 , the chamfered portion 32 d comes into contact with the first convex portion 23 . In the state shown in FIG. 6, the first side surface 30a and the first inner wall surface 22a are in contact with each other, and a gap 33 is formed between the second side surface 30b and the second inner wall surface 22b.

When the chamfered portion 32 d is in contact with the first convex portion 23 and a vertical force is further applied to the permanent magnet 30 , a slip occurs between the chamfered portion 32 d and the first convex portion 23 . Due to this sliding, the permanent magnet 30 is moved toward the second inner wall surface 22b as shown in FIGS. Thereby, the permanent magnet 30 is positioned at a predetermined position along the second inner wall surface 22b. At this time, the permanent magnets 30 are also positioned in the axial direction of the rotor 20 by the first protrusions 23 .

In this embodiment, the rotor core 21 is supported so that the axial direction is parallel to the vertical direction. Therefore, the weight of the permanent magnet 30 can be used as a force in the vertical direction. However, the rotor core 21 may be supported so that the axial direction is in a direction other than the vertical direction. In this case, the permanent magnet 30 inserted into the magnet insertion hole 22 may be pushed in the extension direction of the magnet insertion hole 22 using a jig or the like. Even in this case, the permanent magnet 30 can be positioned at a predetermined position along the second inner wall surface 22b by causing slippage between the chamfered portion 32d and the first convex portion 23 in the same manner as described above.

In the present embodiment, resin is applied only to the second side surface 30 b of the permanent magnet 30 before the process of inserting the permanent magnet 30 into the magnet insertion hole 22 . After the permanent magnet 30 is positioned at the predetermined position, a step of curing the resin is performed. As a result, the permanent magnet 30 is fixed at the predetermined position.

Alternatively, the entire magnet insertion hole 22 may be filled with resin. In this case, the magnet insertion holes 22 may be filled with resin before the process of inserting the permanent magnets 30 into the magnet insertion holes 22 . Alternatively, the magnet insertion holes 22 may be filled with resin after the permanent magnets 30 are positioned at the predetermined positions. In any case, after the permanent magnet 30 is positioned at the predetermined position, a step of curing the resin filled in the magnet insertion hole 22 is performed.

As explained above, the rotating electric machine according to the present embodiment includes the rotor 20 . The rotor 20 has a rotor core 21 and permanent magnets 30 . A magnet insertion hole 22 is formed in the rotor core 21 . A permanent magnet 30 is inserted into the magnet insertion hole 22 . The rotor core 21 has a first inner wall surface 22a and a second inner wall surface 22b. The first inner wall surface 22 a faces the magnet insertion hole 22 . The second inner wall surface 22b faces the first inner wall surface 22a with the magnet insertion hole 22 interposed therebetween. A first protrusion 23 is formed on the first inner wall surface 22a. The first protrusion 23 protrudes toward the magnet insertion hole 22 . The first protrusion 23 is formed at one end of the first inner wall surface 22 a in the axial direction of the rotor 20 . The permanent magnet 30 is adhered to at least the second inner wall surface 22b. The permanent magnet 30 has a first chamfered portion 32d. The first chamfered portion 32 d faces the first convex portion 23 . When viewed in the axial direction, the first convex portion 23 is arranged so as to overlap the first chamfered portion 32d.

According to this configuration, in the process of inserting the permanent magnet 30 into the magnet insertion hole 22, the permanent magnet 30 can be positioned in a short period of time due to slippage occurring between the first chamfered portion 32d and the first convex portion 23. can. Therefore, positioning and fixing of the permanent magnet 30 can be performed in a shorter time without using special manufacturing equipment and additional construction methods. Further, according to this configuration, the permanent magnet 30 can be stably positioned along the second inner wall surface 22b, so that eccentricity of the rotor 20 and magnetic imbalance of the rotor 20 can be suppressed. .

In the rotating electric machine according to the present embodiment, each of the first inner wall surface 22 a and the second inner wall surface 22 b is arranged to be inclined with respect to the radial direction of the rotor 20 . The first inner wall surface 22a is located inside the second inner wall surface 22b in the radial direction.

According to this configuration, the permanent magnet 30 can be fixed along the second inner wall surface 22b positioned radially outward of the rotor 20 . Therefore, the non-magnetic portion between the permanent magnet 30 and the stator 10 can be reduced on the magnetic circuit. Therefore, it is possible to suppress the magnetic imbalance of the rotor 20 on the high performance side.

In the rotating electric machine according to this embodiment, a gap 31 is formed between the permanent magnet 30 and the first inner wall surface 22a. With this configuration, the amount of resin used for fixing the permanent magnets 30 can be reduced.

In a cross section parallel to the axial direction and perpendicular to the first inner wall surface 22a, A is the protrusion height of the first protrusion 23 from the first inner wall surface 22a, B is the thickness of the permanent magnet 30, and the magnet insertion hole 22 , and D is the chamfer dimension of the first chamfer 32d. At this time, the rotating electric machine according to the present embodiment satisfies the relationship (CB)<A<(CB+D).

According to this configuration, when the permanent magnet 30 is inserted into the magnet insertion hole 22, the first chamfered portion 32d can be brought into contact with the first convex portion 23 more reliably.

In the rotating electric machine according to the present embodiment, the relationship A<D is further satisfied. According to this configuration, when the permanent magnet 30 is inserted into the magnet insertion hole 22, the first chamfered portion 32d can be brought into contact with the first convex portion 23 more reliably.

Embodiment 2.
A rotating electrical machine according to Embodiment 2 will be described. FIG. 7 is a diagram showing the configuration of the rotor of the rotary electric machine according to this embodiment. FIG. 7 shows a cut end face of the rotor 20 corresponding to FIG. Components having the same functions and actions as those of the first embodiment are given the same reference numerals, and descriptions thereof are omitted.

As shown in FIG. 7 , rotor core 21 has second protrusions 25 in addition to first protrusions 23 . The second convex portion 25 is formed at the upper end portion of the first inner wall surface 22a in the axial direction of the rotor 20 in FIG. That is, the second protrusion 25 is formed at the other end of the first inner wall surface 22a in the axial direction of the rotor 20 . The second protrusion 25 protrudes toward the magnet insertion hole 22 .

A chamfered portion 32 b of the permanent magnet 30 faces the second convex portion 25 . When viewed in the axial direction of the rotor 20, the chamfered portion 32b and the second convex portion 25 are arranged so as to overlap each other. Hereinafter, the chamfered portion 32b may be referred to as a second chamfered portion.

The rotor core 21 has a structure in which a plurality of first electromagnetic steel sheets 24-1, at least one second electromagnetic steel sheet 24-2, and at least one third electromagnetic steel sheet 24-3 are laminated. In the following description, a plurality of first magnetic steel sheets 24-1, at least one second magnetic steel sheet 24-2, and at least one third magnetic steel sheet 24-3 are collectively referred to as a plurality of magnetic steel sheets. There is

The second electromagnetic steel sheet 24-2 is arranged on one end side of the plurality of electromagnetic steel sheets in the stacking direction of the plurality of electromagnetic steel sheets. The third electromagnetic steel sheet 24-3 is arranged on the other end side of the plurality of electromagnetic steel sheets in the stacking direction of the plurality of electromagnetic steel sheets. In the configuration shown in FIG. 7, one electromagnetic steel sheet at the bottom is the second electromagnetic steel sheet 24-2, one electromagnetic steel sheet at the top is the third electromagnetic steel sheet 24-3, and a plurality of other electromagnetic steel sheets. is the first electromagnetic steel plate 24-1.

A rectangular opening 24a-3 is formed in the third electromagnetic steel plate 24-3. The punched shape of the opening 24a-3 of the third electromagnetic steel plate 24-3 is, for example, the same as the punched shape of the opening 24a-2 of the second electromagnetic steel plate 24-2. The second convex portion 25 is formed by one third electromagnetic steel plate 24-3. The second convex portion 25 may be formed of a plurality of third electromagnetic steel plates 24-3. The protrusion height of the second protrusion 25 from the first inner wall surface 22a is equal to the protrusion height A of the first protrusion 23, for example.

FIG. 8 is a diagram showing a process of inserting permanent magnets into magnet insertion holes in the manufacturing process of the rotor of the rotary electric machine according to the present embodiment. FIG. 8 shows a cut end face of the rotor 20 corresponding to FIG. As shown in FIG. 8, when the permanent magnets 30 are inserted into the magnet insertion holes 22, only the first electromagnetic steel sheets 24-1 and the second electromagnetic steel sheets 24-2 are laminated as the rotor core 21. As shown in FIG. That is, at this stage, the third electromagnetic steel sheets 24-3 are not laminated.

When the permanent magnet 30 is inserted into the magnet insertion hole 22, the permanent magnet 30 is positioned along the second inner wall surface 22b due to the slippage between the chamfered portion 32d and the first convex portion 23. As shown in FIG.

FIG. 9 is a diagram showing a process of laminating the third electromagnetic steel sheets in the manufacturing process of the rotor of the rotary electric machine according to the present embodiment. As shown in FIG. 9, after the permanent magnets 30 are inserted into the magnet insertion holes 22, a third electromagnetic steel plate 24-3 is laminated. As a result, the second convex portion 25 is formed at a position facing the chamfered portion 32b of the permanent magnet 30. As shown in FIG. The second convex portion 25 may be in contact with the chamfered portion 32b.

As described above, in the rotating electric machine according to the present embodiment, the second convex portion 25 is formed on the first inner wall surface 22a. The second protrusion 25 protrudes toward the magnet insertion hole 22 . The second protrusion 25 is formed at the other end of the first inner wall surface 22a in the axial direction. The permanent magnet 30 has a second chamfered portion 32b facing the second convex portion 25. As shown in FIG. When viewed in the axial direction, the second convex portion 25 is arranged so as to overlap the second chamfered portion 32b.

According to this configuration, one end of the permanent magnet 30 is positioned by the first protrusion 23 and the other end of the permanent magnet 30 is positioned by the second protrusion 25 . Therefore, it is possible to position the permanent magnets 30 more stably while preventing the permanent magnets 30 in the magnet insertion holes 22 from being tilted with respect to the axial direction.

Embodiment 3.
A rotating electric machine according to Embodiment 3 will be described. FIG. 10 is a diagram showing the configuration of the rotor of the rotary electric machine according to this embodiment. FIG. 10 shows a cut end face of the rotor 20 corresponding to FIG. Components having the same functions and actions as those in the first or second embodiment are denoted by the same reference numerals, and descriptions thereof are omitted.

As shown in FIG. 10, a third protrusion 26 is formed on the first inner wall surface 22a. The third protrusion 26 is formed between one end of the first inner wall surface 22 a in the axial direction of the rotor 20 and the other end of the first inner wall surface 22 a in the axial direction of the rotor 20 . The third protrusion 26 protrudes toward the magnet insertion hole 22 . The third convex portion 26 faces the first side surface 30 a of the permanent magnet 30 . The third convex portion 26 is provided at a position away from the first convex portion 23 .

The rotor core 21 has a configuration in which a plurality of first electromagnetic steel sheets 24-1, at least one second electromagnetic steel sheet 24-2, and at least one fourth electromagnetic steel sheet 24-4 are laminated. In the following description, the plurality of first magnetic steel sheets 24-1, at least one second magnetic steel sheet 24-2, and at least one fourth magnetic steel sheet 24-4 are collectively referred to as a plurality of magnetic steel sheets. There is

The second electromagnetic steel sheet 24-2 is arranged on one end side of the plurality of electromagnetic steel sheets in the stacking direction of the plurality of electromagnetic steel sheets. The fourth electromagnetic steel sheet 24-4 is arranged between one end and the other end of the plurality of electromagnetic steel sheets in the stacking direction of the plurality of electromagnetic steel sheets. In the configuration shown in FIG. 10, the bottommost electromagnetic steel sheet is the second electromagnetic steel sheet 24-2, and one electromagnetic steel sheet positioned between the bottommost and topmost electromagnetic steel sheets is the fourth electromagnetic steel sheet 24-2. -4. A plurality of electromagnetic steel sheets other than the second electromagnetic steel sheet 24-2 and the fourth electromagnetic steel sheet 24-4 is the first electromagnetic steel sheet 24-1. It is desirable that one or more first electromagnetic steel sheets 24-1 are sandwiched between the second electromagnetic steel sheets 24-2 and the fourth electromagnetic steel sheets 24-4.

A rectangular opening 24a-4 is formed in the fourth electromagnetic steel plate 24-4. The punched shape of the opening 24a-4 of the fourth electromagnetic steel plate 24-4 is different from the punched shape of the opening 24a-1 of the first electromagnetic steel plate 24-1 and the opening 24a-2 of the second electromagnetic steel plate 24-2. It is different from both the punching shape and the The third convex portion 26 is formed by one fourth electromagnetic steel plate 24-4. The third convex portion 26 may be formed by a plurality of fourth electromagnetic steel plates 24-4. The protrusion height of the third protrusion 26 from the first inner wall surface 22a is lower than the protrusion height of the first protrusion 23 from the first inner wall surface 22a.

According to the present embodiment, the permanent magnets 30 in the magnet insertion holes 22 can be prevented from tilting with respect to the axial direction by the third projections 26 . Therefore, the permanent magnet 30 can be more stably positioned along the second inner wall surface 22b.

11 is an enlarged view of the XI section of FIG. 10. FIG. As shown in FIG. 11, B is the thickness of the permanent magnet 30 . Let C be the width of the magnet insertion hole 22 . Let E be the projection height of the third projection 26 from the first inner wall surface 22a. The thickness B, width C, and protrusion height E are all measured along the direction perpendicular to the first inner wall surface 22a, that is, along the left-right direction in FIG. At this time, it is desirable that the relationship E<CB is satisfied.

By satisfying the relationship of E<CB, between the third convex portion 26 and the first side surface 30a of the permanent magnet 30, and between the second inner wall surface 22b and the second side surface 30b of the permanent magnet 30 , is formed with a gap. Therefore, the insertion of the permanent magnet 30 between the third convex portion 26 and the second inner wall surface 22b is not press-fitting. As a result, the vertical force applied to the permanent magnet 30 acts only as a force that causes the chamfered portion 32d and the first convex portion 23 to slide. Therefore, the permanent magnet 30 can be brought closer to the second inner wall surface 22b side more reliably.

As described above, in the rotating electric machine according to the present embodiment, the third convex portion 26 is formed on the first inner wall surface 22a. The third protrusion 26 protrudes toward the magnet insertion hole 22 . The third convex portion 26 is formed between one end of the first inner wall surface 22a in the axial direction and the other end of the first inner wall surface 22a in the axial direction. The protrusion height of the third protrusion 26 from the first inner wall surface 22a is lower than the protrusion height of the first protrusion 23 from the first inner wall surface 22a.

According to this configuration, the permanent magnets 30 in the magnet insertion holes 22 can be prevented from tilting with respect to the axial direction by the third protrusions 26 . Therefore, the permanent magnet 30 can be more stably positioned along the second inner wall surface 22b.

In Embodiments 1 to 3 described above, the first inner wall surface 22a on which the first protrusions 23 are formed is located inside the second inner wall surface 22b in the radial direction of the rotor 20. As shown in FIG. Therefore, the permanent magnets 30 are positioned along the second inner wall surface 22b positioned radially outward of the rotor 20 . However, the inner wall surface on which the permanent magnets 30 are positioned is not limited to the inner wall surface positioned radially outward of the rotor 20 .

For example, if the first inner wall surface 22a is located outside the second inner wall surface 22b in the radial direction of the rotor 20, the permanent magnets 30 are arranged along the inner wall surface located inside the rotor 20 in the radial direction. can be positioned. In this manner, the permanent magnet 30 can be positioned along any inner wall surface of the magnet insertion hole 22 by appropriately changing the positional relationship between the first inner wall surface 22a and the second inner wall surface 22b.

FIG. 12 is a diagram showing an example of the configuration of the first convex portion of the rotor of the rotating electric machine according to Embodiments 1 to 3 when viewed in the axial direction of the rotor. In FIG. 12 and FIGS. 13 and 14 to be described later, the first convex portion 23 is hatched. As shown in FIG. 12 , the first convex portion 23 is provided over the entire first inner wall surface 22 a , that is, over the entire side of the magnet insertion hole 22 when viewed in the axial direction of the rotor 20 .

FIG. 13 is a diagram showing another example of the configuration of the first convex portion of the rotor of the rotating electric machine according to Embodiments 1 to 3 when viewed in the axial direction of the rotor. As shown in FIG. 13 , the first protrusion 23 is provided on part of one side of the magnet insertion hole 22 . The first protrusion 23 has a width narrower than one side of the magnet insertion hole 22 . In the example shown in FIG. 13, two first protrusions 23 are provided. The two first protrusions 23 are arranged side by side with a space therebetween. The number of first protrusions 23 may be one or three or more. When the number of the first protrusions 23 is two or more, in the step of inserting the permanent magnets 30 into the magnet insertion holes 22, the chamfered portions 32d of the permanent magnets 30 come into contact with the first protrusions 23 at least two places, It is positioned along the second inner wall surface 22b. Therefore, when viewed in the axial direction of the rotor 20, it is possible to prevent the permanent magnets 30 from being inclined with respect to the second inner wall surface 22b.

FIG. 14 is a diagram showing still another example of the configuration of the rotor of the rotating electric machine according to Embodiments 1 to 3 when the first protrusion is viewed in the axial direction of the rotor. As shown in FIG. 14 , the first convex portion 23 has a semicircular shape when viewed in the axial direction of the rotor 20 . As described above, the shape of the first convex portion 23 when viewed in the axial direction of the rotor 20 is not limited to a rectangular shape, and may be another shape.

Similarly, when viewed in the axial direction of the rotor 20, the second protrusion 25 may be provided over the entire side of the magnet insertion hole 22, or may be provided along a part of the side of the magnet insertion hole 22. may The number of second protrusions 25 may be one or plural. The shape of the second convex portion 25 when viewed in the axial direction of the rotor 20 may be various shapes such as a rectangular shape and a semicircular shape.

Similarly, when viewed in the axial direction of the rotor 20, the third protrusion 26 may be provided over the entire side of the magnet insertion hole 22, or may be provided along a part of the side of the magnet insertion hole 22. may The number of the third protrusions 26 may be one or plural. The shape of the third protrusion 26 when viewed in the axial direction of the rotor 20 may be various shapes such as a rectangular shape and a semicircular shape.

In the first to third embodiments described above, in the step of inserting the permanent magnet 30 into the magnet insertion hole 22, the permanent magnet 30 is positioned with the chamfered portion 32d and the first convex portion 23 in contact with each other. However, in the subsequent steps until the permanent magnets 30 are fixed with resin or the like, the permanent magnets 30 may change their position within an allowable range for various reasons. Therefore, the chamfered portion 32d and the first convex portion 23 may not be in contact with each other in the rotor 20 after being completed as a final product.

That is, in the completed rotor 20, the chamfered portion 32d and the first convex portion 23 do not have to be in contact with each other. Even if the chamfered portion 32d and the first convex portion 23 are not in contact with each other in the rotor 20 after completion, they have the function of positioning the permanent magnets 30 at predetermined positions in the step of inserting the permanent magnets 30 into the magnet insertion holes 22. have.

In the above embodiments, an electric motor is used as an example of a rotating electric machine, but the above embodiments can also be applied to a generator.

The first to third embodiments described above can be implemented in combination with each other.

10 stator, 11 shaft, 20 rotor, 21 rotor core, 22 magnet insertion hole, 22a first inner wall surface, 22b second inner wall surface, 23 first protrusion, 24-1 first electromagnetic steel sheet, 24-2 second electromagnetic steel sheet , 24-3 third electromagnetic steel plate, 24-4 fourth electromagnetic steel plate, 24a-1, 24a-2, 24a-3, 24a-4 opening, 25 second protrusion, 26 third protrusion, 30 permanent magnet 30a first side surface 30b second side surface 31 gap 32a chamfered portion 32b chamfered portion (second chamfered portion) 32c chamfered portion 32d chamfered portion (first chamfered portion) 33 gap A protrusion height B Thickness, C width, D chamfer dimension, E protrusion height.

Claims (7)

A rotor having a rotor core formed with a magnet insertion hole and a permanent magnet inserted into the magnet insertion hole,
The rotor core has a first inner wall surface facing the magnet insertion hole and a second inner wall surface facing the first inner wall surface across the magnet insertion hole,
A first protrusion projecting toward the magnet insertion hole is formed on the first inner wall surface,
The first protrusion is formed at one end of the first inner wall surface in the axial direction of the rotor,
The permanent magnet is adhered to at least the second inner wall surface,
The permanent magnet has a first chamfered portion facing the first convex portion,
The rotating electrical machine, wherein the first convex portion is arranged to overlap the first chamfered portion when viewed in the axial direction. Each of the first inner wall surface and the second inner wall surface is arranged to be inclined with respect to the radial direction of the rotor,
The rotary electric machine according to claim 1, wherein the first inner wall surface is located inside the second inner wall surface in the radial direction. A second protrusion projecting toward the magnet insertion hole is formed on the first inner wall surface,
The second protrusion is formed at the other end of the first inner wall surface in the axial direction,
The permanent magnet has a second chamfered portion facing the second convex portion,
The rotating electric machine according to claim 1 or 2, wherein the second convex portion is arranged so as to overlap with the second chamfered portion when viewed in the axial direction. The first inner wall surface is formed with a third protrusion protruding toward the magnet insertion hole,
The third convex portion is formed between the one end portion of the first inner wall surface in the axial direction and the other end portion of the first inner wall surface in the axial direction,
4. Any one of claims 1 to 3, wherein the protrusion height of the third protrusion from the first inner wall surface is lower than the protrusion height of the first protrusion from the first inner wall surface. The rotary electric machine according to the item. The electric rotating machine according to any one of claims 1 to 4, wherein a gap is formed between the permanent magnet and the first inner wall surface. In a cross section parallel to the axial direction and perpendicular to the first inner wall surface, A is the protrusion height of the first protrusion from the first inner wall surface, B is the thickness of the permanent magnet, and the magnet is inserted. When the width of the hole is C and the chamfer dimension of the first chamfer is D,
6. The electric rotating machine according to claim 1, wherein the relationship of (CB)<A<(CB+D) is satisfied. 7. The electric rotating machine according to claim 6, further satisfying the relationship A<D.

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