WO2018212054A1

WO2018212054A1 - Rotor

Info

Publication number: WO2018212054A1
Application number: PCT/JP2018/018047
Authority: WO
Inventors: 大澤　康彦; 青田　桂治; 祥司郎中
Original assignee: ダイキン工業株式会社
Priority date: 2017-05-16
Filing date: 2018-05-10
Publication date: 2018-11-22
Also published as: JP2018196320A

Abstract

This rotor (10) is provided with: a rotor core (20); a plurality of permanent magnets (23) arranged side-by-side in the circumferential direction of the rotor core (20); and a block (30) having a facing surface (32) which faces one axial end surface of the rotor core (20), and formed from a material having relative magnetic permeability higher than 1. The contour of the facing surface (32) of the block (30) has a shape which fits radially inside the plurality of permanent magnets (23) when viewed in the axial direction of the rotor core (20). The abovementioned configuration enables to prevent the formation of a magnetic short circuit within the rotor when a material having high relative magnetic permeability is used to form a member for increasing the inertia of the rotor.

Description

Rotor

The present invention relates to a rotor.

Conventionally, a rotor provided in a rotating electric machine is widely known (for example, Patent Document 1). The rotor of this document includes a rotor core made of a magnetic material and a plurality of permanent magnets arranged side by side in the circumferential direction of the rotor core.

JP2015-42124A

Incidentally, when the load to which the rotor is connected fluctuates, the rotation speed of the rotor also fluctuates, and it is conceivable to increase the inertia of the rotor in order to suppress the fluctuation of the rotation speed. The point where the member for increasing the inertia is provided will normally be at one or both ends in the axial direction of the rotor.

Here, when a material having a large relative permeability such as an electromagnetic steel plate widely used as a motor material is used as a material for a member for increasing the inertia, the manufacturing cost of the member can be suppressed. However, if the member is made of a material having a high relative permeability, the member provided at the end in the axial direction of the rotor may form a magnetic path, and the magnetic flux of the permanent magnet may be short-circuited in the rotor.

The present invention has been made in view of such a point, and the object thereof is to form a short-circuit magnetic path in the rotor when a member for increasing the inertia of the rotor is made of a material having a high relative magnetic permeability. Is to deter

The first aspect of the present disclosure is directed to the rotor (10). The rotor (10) includes a rotor core (20) made of a magnetic material, a plurality of permanent magnets (23) provided side by side in the circumferential direction of the rotor core (20), and one axial direction side of the rotor core (20) A block portion (30) made of a material having a relative permeability greater than 1 and having a facing surface (32) facing the end surface of the block, and an outer shape of the facing surface (32) of the block portion (30) Is a shape that fits radially inward of the plurality of permanent magnets (23) when viewed from the axial direction of the rotor core (20).

In the first aspect, since the rotor (10) includes the rotor core (20) and the block portion (30), the inertia of the rotor (10) becomes larger than when the block portion (30) is not provided. Thereby, even if the load to which the rotor (10) is connected fluctuates, the rotation speed of the rotor (10) is suppressed from fluctuating greatly. Moreover, since the block part (30) is made of a material having a relative permeability larger than 1, it can be manufactured at low cost.

Here, when the opposing surface (32) of the block part (30) extends from the radially inner side to the radially outer side of the permanent magnet (23), the magnetic flux generated by the permanent magnet (23) is changed to the block part (30 ) Through the same permanent magnet (23) or circumferentially adjacent permanent magnet (23) to form a short-circuit magnetic path in the rotor (10). On the other hand, in the first aspect, the outer shape of the facing surface (32) of the block portion (30) is within the radial direction of the plurality of permanent magnets (23) when viewed from the axial direction of the rotor core (20). Shape. For this reason, the magnetic flux generated by the permanent magnet (23) easily flows out of the rotor (10), and the formation of the short-circuit magnetic path as described above is suppressed.

According to a second aspect of the present disclosure, in the first aspect, the block portion (30) is entirely inside the radial direction of the plurality of permanent magnets (23) when viewed from the axial direction of the rotor core (20). It is characterized by being contained.

In the second aspect, the block portion (30) made of a material having a relative permeability larger than 1 does not exist on the radially outer side of the plurality of permanent magnets (23) when viewed from the axial direction. For this reason, it is suppressed more reliably that the above-mentioned short circuit magnetic path is formed in a rotor (10).

The third aspect of the present disclosure is characterized in that, in the second aspect, the block portion (30) is composed of a plurality of electromagnetic steel sheets having the same shape.

In the third aspect, it is sufficient to prepare a plurality of one type of electrical steel sheet to constitute the block portion (30). For this reason, a rotor (10) provided with a block part (30) can be manufactured at low cost.

According to a fourth aspect of the present disclosure, in any one of the first to third aspects, vibration is provided on one side in the axial direction of the block portion (30) and is generated when the rotor (10) is rotated. It is characterized by having a balance weight part (50) for suppressing the above.

In the fourth aspect, the balance weight part (50) is provided so as to sandwich the block part (30) between the rotor core (20). The balance weight portion (50) suppresses vibrations generated when the rotor (10) rotates.

The fifth aspect of the present disclosure is characterized in that, in the fourth aspect, the balance weight part (50) is composed of a plurality of electromagnetic steel sheets having the same shape.

In the fifth aspect, it is sufficient to prepare a plurality of one type of electrical steel sheet in order to form the balance weight portion (50). For this reason, the rotor (10) provided with the balance weight part (50) can be manufactured at low cost.

According to a sixth aspect of the present disclosure, in the fourth or fifth aspect, each of the block portion (30) and the balance weight portion (50) includes an outer peripheral surface (33) that surrounds the axis of the rotor core (20). , 34, 55, 56).

Here, in order to realize the function as a balance weight, the balance weight portion (50) may have a center of gravity eccentric from the axis of the rotor (10). For this reason, for example, it is also conceivable that the balance weight portion (50) has a horseshoe shape extending around the axis of the rotor core (20). However, such a horseshoe-shaped balance weight part (50) causes a relatively large windage loss due to resistance at both ends in the circumferential direction, particularly when the rotor (10) rotates.

On the other hand, in the sixth aspect, the balance weight portion (50) and the block portion (30) in addition to the outer peripheral surface (33, 34, 55, 56) surrounding the axis of the rotor core (20). Have Since the balance weight part (50) and the block part (30) having such an outer peripheral surface (33, 34, 55, 56) do not have a part that becomes a large resistance when the rotor (10) is rotated, Like the balance weight part (50), it does not cause a large windage loss. Therefore, according to the said 6th aspect, the windage loss which arises at the time of rotation of a rotor (10) is suppressed.

According to a seventh aspect of the present disclosure, in the sixth aspect, the balance weight portion (50) includes a weight portion (51) corresponding to a part of the outer peripheral surface (33, 34, 55, 56), A wall portion (52) corresponding to the remaining portion of the outer peripheral surface (33, 34, 55, 56), and the weight portion (51) and the wall portion (52) in the balance weight portion (50) A through hole (54) penetrating the balance weight part (50) in the axial direction is formed between the rotor (10) and the rotor (10) is an opening on one axial side of the through hole (54). And a closing plate (70) for closing the cover.

Here, if the opening of the through hole (54) between the weight part (51) and the wall part (52) is exposed, the air flow is disturbed in the through hole (54) when the rotor (10) rotates. And a relatively large windage loss occurs. On the other hand, in the seventh aspect, since the opening of the through hole (54) is closed by the closing plate (70), the occurrence of such air flow turbulence is suppressed, and thus the rotor (10) Windage loss that occurs during rotation is suppressed.

According to the first aspect, since the inertia of the rotor (10) is increased by the block (30), the rotational speed of the rotor (10) is increased even when the load to which the rotor (10) is connected fluctuates. Fluctuation can be suppressed.

Further, according to the first aspect, the block portion (30) that increases the inertia of the rotor (10) is formed of a material having a relative magnetic permeability larger than 1, so the rotor including the block portion (30) is provided. (10) can be manufactured at low cost.

Further, according to the first aspect, since the opposing surface (32) of the block portion (30) is accommodated inside the radial direction of the plurality of permanent magnets (23) when viewed from the axial direction, the block portion (30 ) Can be prevented from forming a short-circuit magnetic path in the rotor (10).

Further, according to the second aspect, it is possible to more reliably prevent the short-circuit magnetic path from being formed in the rotor (10) via the block portion (30).

Moreover, according to the said 3rd aspect, the rotor (10) provided with a block part (30) can be manufactured cheaply.

Further, according to the fourth aspect, vibration generated when the rotor (10) is rotated can be suppressed by the balance weight part (50).

Further, according to the fifth aspect, the rotor (10) including the balance weight part (50) can be manufactured at low cost.

Further, according to the sixth and seventh aspects, windage loss that occurs when the rotor (10) rotates can be suppressed.

FIG. 1 is a perspective view of a rotor according to an embodiment of the present invention, in which a closing plate is omitted. FIG. 2 is a cross-sectional view taken along the line II-II in FIG. FIG. 3 is a plan view of the rotor with the balance weight portion and the closing plate omitted. FIG. 4 is a plan view of the rotor shown with the closing plate omitted. FIG. 5 is a view corresponding to FIG. 2 in a modification of the embodiment of the present invention.

Embodiments of the present invention will be described in detail with reference to the drawings. The following embodiments are essentially preferable examples, and are not intended to limit the scope of the present invention, its application, or its use.

The rotor (10) of the present embodiment is provided, for example, on the radially inner side of a stator (not shown) in a rotating electric machine. As shown in FIGS. 1 to 4, the rotor (10) includes a rotor core (20), a plurality (six in this example) of permanent magnets (23), two end plates (24, 26), Two block portions (30, 40), two balance weight portions (50.60), and two closing plates (70, 72) are provided.

As shown in FIGS. 1 and 2, the rotor core (20) is a cylindrical member made of a magnetic material. The rotor core (20) is formed by, for example, laminating electromagnetic steel plates punched in an annular shape in the axial direction (vertical direction in FIG. 2). The rotor core (20) may be formed of a magnetic material other than a dust core or other electromagnetic steel plate, for example. A shaft hole (21) for inserting a shaft (not shown) is formed in the center of the rotor core (20) so as to penetrate the rotor core (20) in the axial direction. A plurality of (six in this example) magnet slits (22) are formed in the outer circumferential portion of the rotor core (20) so as to penetrate the rotor core (20) in the axial direction.

As shown in FIGS. 2 to 4, the plurality of permanent magnets (23) are provided side by side in the circumferential direction of the rotor core (20), and each permanent magnet (23) is embedded one by one in the magnet slit (22). . Each of the plurality of permanent magnets (23) has an elongated rectangular shape in cross section. The plurality of permanent magnets (23) are magnetized so that N poles and S poles appear alternately in the circumferential direction. The shape and number of permanent magnets (23) are not limited to those shown in the figure.

As shown in FIG. 1 and FIG. 2, the end plates (24, 26) are disk-shaped members provided one by one at both ends in the axial direction of the rotor core (20), and are made of a nonmagnetic material. Yes. A shaft hole (25, 27) is formed in the center of each end plate (24, 26) for insertion into a shaft (not shown).

The block part (30) (hereinafter referred to as the first block part (30)) on one axial side (the upper side in FIG. 2) has an end plate (24) on one axial side as shown in FIGS. It is a columnar member provided adjacent to one side in the axial direction of the first end plate (24). The first block portion (30) is formed by laminating a plurality of electromagnetic steel plates having the same shape in the axial direction. A shaft hole (31) for inserting a shaft (not shown) is formed at the center of the first block portion (30).

The first block part (30) has a shape such that each corner of the regular hexagon is cut out linearly in plan view. Therefore, the outer shape of the first block portion (30) (the shape shown in FIG. 3) is a shape in which six relatively long sides and six relatively short sides are alternately formed in the circumferential direction. As shown in FIG. 3, the relatively long side of the outer shape is along the long side on the radially inner side of the permanent magnet (23) in plan view. That is, the first block portion (30) is entirely contained inside the plurality of permanent magnets (23) in the radial direction when viewed from the axial direction of the rotor core (20).

Further, as shown in FIGS. 1 to 3, the outer peripheral surfaces (33, 34) of the first block portion (30) are separated from the shaft center of the rotor core (20) and surround the shaft center. More specifically, the outer peripheral surface (33, 34) of the first block portion (30) includes a planar first block long side surface (33) corresponding to each side of the hexagonal shape, and the first block long side. A flat first block short side surface (34) provided between the surfaces (33) and having a shorter circumferential length than the first block long side surface (33). The first block long side surface (33) is along the long side on the radially inner side of the rectangular permanent magnet (23) when viewed from the axial direction of the rotor core (20). The first block long side surface (33) and the second block short side surface (44) extend in the circumferential direction as viewed from the axial direction of the rotor core (20).

Further, as shown in FIG. 2, the first block portion (30) has a first facing surface (32) facing the end surface on one axial side of the rotor core (20). In this example, the first facing surface (32) is in contact with the first end plate (24). The outer shape of the first facing surface (32) is the same as the outer shape described above because the first block portion (30) is composed of a plurality of laminated steel plates having the same shape. Therefore, the outer shape of the first facing surface (32) is a shape that fits inside the plurality of permanent magnets (23) in the radial direction when viewed from the axial direction of the rotor core (20). The first facing surface (32) constitutes the facing surface.

As shown in FIG. 1 to FIG. 3, the other axial end plate (26) on the other axial side (lower side in FIG. 2) (hereinafter referred to as the second block portion (40)) is provided. ) (Hereinafter referred to as the second end plate (26)) is a columnar member provided adjacent to the other axial side. The second block portion (40) is formed by laminating a plurality of electromagnetic steel plates having the same shape as the electromagnetic steel plates constituting the first block portion (30) in the axial direction. A shaft hole (41) for inserting a shaft (not shown) is formed at the center of the second block portion (40).

As can be seen from FIG. 1, the second block portion (40) is such that the long side of the hexagonal shape overlaps the long side of the hexagonal shape of the first block portion (30) when viewed from the axial direction of the rotor core (20). (That is, in the same direction as the first block portion (30)). Therefore, the entire second block portion (40) is accommodated radially inward of the plurality of permanent magnets (23) when viewed from the axial direction of the rotor core (20).

The outer peripheral surface (43, 44) of the second block portion (40) has the same shape as the outer peripheral surface (33, 34) of the first block portion (30) and surrounds the axis of the rotor core (20). It is out. More specifically, the outer peripheral surface (43, 44) of the second block portion (40) includes a planar second block long side surface (43) corresponding to each hexagonal side and the second block long side. A planar second block short side surface (44) provided between the surfaces (43) and having a shorter circumferential length than the second block long side surface (43). The second block long side surface (43) is along the long side on the radially inner side of the rectangular permanent magnet (23) when viewed from the axial direction of the rotor core (20). The second block long side surface (43) and the second block short side surface (44) each extend in the circumferential direction when viewed from the axial direction of the rotor core (20).

Further, as shown in FIG. 2, the second block portion (40) has a second facing surface (42) facing the end surface on the other axial side of the rotor core (20). In this example, the second facing surface (42) is in contact with the second end plate (26). The outer shape and orientation of the second opposing surface (42) are the same as the outer shape and orientation of the first opposing surface (32). Therefore, the outer shape of the second facing surface (42) is a shape that fits inside the plurality of permanent magnets (23) in the radial direction when viewed from the axial direction of the rotor core (20).

The balance weight part (50) (hereinafter referred to as the first balance weight part (50)) on one side in the axial direction (upper side in FIG. 2) of the first block part (30) as shown in FIGS. It is a member provided adjacent to one side in the axial direction. The first balance weight portion (50) is formed by laminating a plurality of electromagnetic steel plates having the same shape in the axial direction. The 1st balance weight part (50) is for suppressing the vibration which arises at the time of rotation of a rotor (10). The electromagnetic steel sheet constitutes a material having a relative permeability larger than 1.

The outer shape of the first balance weight part (50) is the same as the outer shape of the first block part (30) as shown in FIGS. Then, the relatively long side of the outer shape of the first balance weight part (50) is along the long side on the radially inner side of the permanent magnet (23) in plan view, as shown in FIG. That is, the first balance weight portion (50) is entirely contained inside the plurality of permanent magnets (23) in the radial direction when viewed from the axial direction of the rotor core (20).

The outer peripheral surface of the first balance weight portion (50) surrounds the axis of the rotor core (20) as shown in FIGS. More specifically, the outer peripheral surface (55, 56) of the first balance weight portion (50) is a flat first balance weight long side surface (55) corresponding to each side of the hexagonal shape, and the first balance weight. A flat first balance weight short side surface (56) provided between the weight long side surfaces (55) and having a shorter circumferential length than the first balance weight long side surface (55). The first balance weight long side surface (55) is along the long side on the radially inner side of the rectangular permanent magnet (23) when viewed from the axial direction of the rotor core (20). The first balance weight long side surface (55) and the first balance weight short side surface (56) extend in the circumferential direction as viewed from the axial direction of the rotor core (20).

Further, the first balance weight part (50) includes a first weight part (51) corresponding to a part (substantially half part) of the outer peripheral surface and the outer periphery as shown in FIGS. A first wall (52) corresponding to the remainder of the surface. The first weight part (51) constitutes a weight part, and the first wall part (52) constitutes a wall part.

Further, a first shaft attachment portion (53) for inserting a shaft (not shown) is provided between the first weight portion (51) and the first wall portion (52). Around the first shaft mounting portion (53) between the first weight portion (51) and the first wall portion (52), the first balance weight portion (50) is disposed in the thickness direction (that is, in the axial direction). ) Three first through holes (54) are formed. Between each 1st through-hole (54), the two 1st connection parts (57) which connect a 1st shaft attaching part (53) and a 1st wall part (52) are provided. The first through hole (54) constitutes a through hole.

The balance weight part (60) (hereinafter referred to as the second balance weight part (60)) on the other side in the axial direction (the lower side in FIG. 2) is the second block part (40) as shown in FIGS. It is a member provided adjacent to the other axial direction side. The second balance weight portion (60) is formed by laminating a plurality of electromagnetic steel plates having the same shape in the axial direction. The second balance weight part (60) is for suppressing vibration generated when the rotor (10) rotates. The electromagnetic steel sheet constitutes a material having a relative permeability larger than 1.

The outer shape of the second balance weight part (60) is the same as the outer shape of the second balance weight part (60). The relatively long side of the outer shape of the second balance weight part (60) is along the long side on the radially inner side of the permanent magnet (23) in plan view. That is, the second balance weight part (60) is entirely contained inside the plurality of permanent magnets (23) in the radial direction when viewed from the axial direction of the rotor core (20).

Further, the outer peripheral surface of the second balance weight part (60) surrounds the axis of the rotor core (20) as shown in FIGS. More specifically, the outer peripheral surface (65, 66) of the second balance weight portion (60) is a flat second balance weight long side surface (65) corresponding to each side of the hexagon, and the second balance weight. A planar second balance weight short side surface (66) provided between the weight long side surfaces (65) and having a shorter circumferential length than the second balance weight long side surface (65). The second balance weight long side surface (65) is along the long side on the radially inner side of the rectangular permanent magnet (23) when viewed from the axial direction of the rotor core (20). The second balance weight long side surface (65) and the second balance weight short side surface (66) extend in the circumferential direction as viewed from the axial direction of the rotor core (20).

Further, as shown in FIG. 2, the second balance weight portion (60) corresponds to the second weight portion (61) corresponding to a part (substantially half) of the outer peripheral surface and the remaining portion of the outer peripheral surface. And a second wall portion (62).

Further, a second shaft attachment portion (63) for inserting a shaft (not shown) is provided between the second weight portion (61) and the second wall portion (62). Around the second shaft mounting portion (63) between the second weight portion (61) and the second wall portion (62), the second balance weight portion (60) is disposed in the thickness direction (that is, in the axial direction). Two second through-holes (64) are formed. Between each 2nd through-hole (64), the 2nd connection part (not shown) which connects a 2nd shaft attaching part (63) and a 2nd wall part (62) is provided.

The closing plate (70) on the one side in the axial direction (upper side in FIG. 2) (hereinafter referred to as the first closing plate (70)) is one side in the axial direction of the first balance weight part (50) as shown in FIG. It is the plate-shaped member provided adjacent to. The first closing plate (70) is, for example, an electromagnetic steel plate having the same shape as the electromagnetic steel plate constituting the first block portion (30). A shaft hole (71) for inserting a shaft (not shown) is formed at the center of the first closing plate (70). The first closing plate (70) closes the opening of the first through hole (54) formed in the first balance weight part (50). The first closing plate (70) constitutes a closing plate.

As shown in FIG. 2, the other axial side (lower side in FIG. 2) closing plate (72) (hereinafter referred to as the second closing plate (72)) is the other axial end of the second balance weight part (60). It is the plate-shaped member provided adjacent to the side. The second blocking plate (72) is, for example, an electromagnetic steel plate having the same shape as the electromagnetic steel plate constituting the second block portion (40). A shaft hole (73) for inserting a shaft (not shown) is formed at the center of the second closing plate (72). The second closing plate (72) closes the opening of the second through hole (64) formed in the second balance weight part (60).

-Effects of the embodiment-
In this embodiment, the inertia of the rotor (10) is increased by providing the first and second block portions (30, 40) as compared to the case where the first and second block portions (30, 40) are not provided. Therefore, even when the load to which the rotor (10) is connected fluctuates, it is possible to prevent the rotation speed of the rotor (10) from fluctuating greatly.

In the present embodiment, the first and second block portions (30, 40) that increase the inertia of the rotor (10) are formed by laminating a plurality of electromagnetic steel sheets having the same shape. The rotor (10) including the second block portion (30, 40) can be manufactured at low cost.

Further, in the present embodiment, the entirety of the first and second block portions (30, 40) made of the electromagnetic steel plate is accommodated inside the plurality of permanent magnets (23) in the radial direction when viewed from the axial direction of the rotor core (20). Therefore, it is possible to reliably prevent a short-circuit magnetic path from being formed in the rotor (10) via the first and second block portions (30, 40). It can suppress that the efficiency of the provided rotating electrical machine falls.

Further, in the present embodiment, the entire first and second balance weight portions (50, 60) made of electromagnetic steel sheets are radially inward of the plurality of permanent magnets (23) when viewed from the axial direction of the rotor core (20). Therefore, it is possible to reliably prevent a short-circuit magnetic path from being formed in the rotor (10) via the first and second balance weight portions (50, 60), and thus the rotor (10 ) Can be prevented from lowering the efficiency of the rotating electrical machine.

Moreover, in this embodiment, since the 1st balance weight part (50) for suppressing the vibration produced at the time of rotation of a rotor (10) is formed by laminating | stacking several laminated steel plates of the same shape, the said 1st The rotor (10) provided with the balance weight part (50) can be manufactured at low cost. The same applies to the second balance weight part (60).

In the present embodiment, the outer peripheral surfaces (33, 34, 43, 44, 55, 56, 65, 66) of the respective block portions (30, 40) and the balance weight portions (50, 60) (that is, the first And second block long side surfaces (33, 43), first and second block short side surfaces (34, 44), first and second balance weight long side surfaces (55, 65), and first and second balances. Since the weight short side surface (56, 66)) extends in the circumferential direction when viewed from the axial direction of the rotor core (20) and is continuous over the entire circumference, the outer circumferential surface becomes a resistance when the rotor (10) rotates. Therefore, by providing each block part (30, 40) and each balance weight part (50, 60), it is possible to avoid a significant increase in windage loss when the rotor (10) rotates.

In the present embodiment, the opening of the first through hole (54) of the first balance weight part (50) is formed by the first closing plate (70), and the second balance weight part (60) is formed by the second closing plate (72). ) Of the second through holes (64) are closed, so that the formation of the respective through holes (54, 64) avoids a significant increase in windage loss when the rotor (10) rotates. be able to.

-Modification of the embodiment-
A modification of the embodiment will be described with reference to FIG. In this modification, the shape of each block part (30, 40) is different from that of the above embodiment. Hereinafter, differences from the above embodiment will be mainly described.

As shown in FIG. 5, in this modification, the first and second block portions (30, 40) are configured to project outward in the radial direction as they move away from the rotor core (20).

The outer shape of the first facing surface (32) facing the end surface on one axial side (upper side in FIG. 5) of the rotor core (20) in the first block portion (30) is viewed from the axial direction of the rotor core (20). The shape fits inside the plurality of permanent magnets (23) in the radial direction. The outer shape of the first facing surface (32) is preferably the same as the outer shape of the first facing surface (32) of the above embodiment.

The outer shape of the second facing surface (42) facing the end surface on the other axial side (lower side in FIG. 5) of the rotor core (20) in the second block portion (40) is the axial direction of the rotor core (20). The shape fits inside the plurality of permanent magnets (23) in the radial direction. The outer shape of the second facing surface (42) is preferably the same as the outer shape of the second facing surface (42) of the above embodiment.

<< Other Embodiments >>
In the above embodiment, each block (30, 40) and each balance weight (50, 60) are formed by laminating electromagnetic steel plates, at least one of which is a dust core or other magnetic material Alternatively, it may be formed of a material having a relative permeability greater than 1, such as iron, SUS304, or carbon steel. When each block part (30, 40) and each balance weight part (50, 60) are both formed of a powder magnetic core, they may be integrally formed.

As described above, the present invention is useful for the rotor.

10 Rotor 20 Rotor core 23 Permanent magnet 30 First block (block)
32 First facing surface (facing surface)
33 1st block long side surface (outer peripheral surface)
34 Short side of block 1 (outer peripheral surface)
50 1st balance weight part (balance weight part)
51 1st weight part (weight part)
52 First wall (wall)
54 1st through hole (through hole)
55 1st balance weight long side surface (outer peripheral surface)
56 1st balance weight short side (outer peripheral surface)
70 First closing plate (blocking plate)

Claims

A rotor core (20) made of magnetic material;
A plurality of permanent magnets (23) provided side by side in the circumferential direction of the rotor core (20);
A block portion (30) made of a material having a relative permeability greater than 1 and having a facing surface (32) facing the end surface on one axial side of the rotor core (20);
The outer shape of the opposing surface (32) of the block portion (30) is a shape that fits inside the radial direction of the plurality of permanent magnets (23) when viewed from the axial direction of the rotor core (20). Rotor to do.
In claim 1,
The block part (30) is entirely accommodated in the radial direction inside of the plurality of permanent magnets (23) when viewed from the axial direction of the rotor core (20).
In claim 2,
The block part (30) is composed of a plurality of electromagnetic steel sheets having the same shape.
In any one of claims 1 to 3,
A rotor provided with a balance weight part (50) provided on one side in the axial direction of the block part (30) for suppressing vibrations generated when the rotor (10) rotates.
In claim 4,
The balance weight portion (50) is composed of a plurality of electromagnetic steel plates having the same shape.
In claim 4 or 5,
Each of the block part (30) and the balance weight part (50) has an outer peripheral surface (33, 34, 55, 56) surrounding the axis of the rotor core (20).
In claim 6,
The balance weight portion (50) corresponds to the weight portion (51) corresponding to a part of the outer peripheral surface (33,34,55,56) and the remaining portion of the outer peripheral surface (33,34,55,56). A wall portion (52) to be
Between the weight part (51) and the wall part (52) in the balance weight part (50), a through hole (54) penetrating the balance weight part (50) in the axial direction is formed. And
The rotor (10) includes a closing plate (70) for closing the opening on the one axial side of the through hole (54).