CN109643921B - Rotating electrical machine - Google Patents
Rotating electrical machine Download PDFInfo
- Publication number
- CN109643921B CN109643921B CN201780038591.3A CN201780038591A CN109643921B CN 109643921 B CN109643921 B CN 109643921B CN 201780038591 A CN201780038591 A CN 201780038591A CN 109643921 B CN109643921 B CN 109643921B
- Authority
- CN
- China
- Prior art keywords
- laminated
- fan
- thin plate
- rotor core
- rotor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 230000002093 peripheral effect Effects 0.000 claims abstract description 20
- 238000003475 lamination Methods 0.000 claims description 22
- 230000005291 magnetic effect Effects 0.000 description 49
- 230000004907 flux Effects 0.000 description 36
- 230000008878 coupling Effects 0.000 description 32
- 238000010168 coupling process Methods 0.000 description 32
- 238000005859 coupling reaction Methods 0.000 description 32
- 238000000034 method Methods 0.000 description 9
- 238000010030 laminating Methods 0.000 description 8
- 238000004804 winding Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 230000005294 ferromagnetic effect Effects 0.000 description 2
- 239000003302 ferromagnetic material Substances 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 230000001771 impaired effect Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/27—Rotor cores with permanent magnets
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Iron Core Of Rotating Electric Machines (AREA)
- Permanent Field Magnets Of Synchronous Machinery (AREA)
Abstract
A rotating electrical machine (100) is provided with a stator (3) and a rotor (6), and a rotor core (60) is provided with: the rotor core is provided with an annular laminated annular part (61) which is arranged on the inner peripheral side of the rotor core (60) and is embedded with a rotating shaft (65), a laminated fan-shaped part (62) which is arranged on the outer peripheral side of the rotor core (60) and is clamped by two permanent magnets (8) from two side surfaces in the circumferential direction, and the section of the laminated fan-shaped part is in a fan shape, and a laminated connecting part (63) which is inclined relative to the radial direction and connects the laminated annular part (61) and the laminated fan-shaped part (62).
Description
Technical Field
The present invention relates to an internal-rotation type rotating electric machine in which a rotor is disposed on an inner peripheral side of a stator and a magnet is embedded in a core of the rotor.
Background
Conventionally, as one of methods for increasing the amount of magnets used for each magnetic pole of a rotor to improve the output of a rotating electrical machine, there is a structure in which magnets are radially embedded in a core of the rotor so that each magnetic pole faces a tangential direction of the rotor. In this case, the iron cores and the permanent magnets are alternately arranged in the circumferential direction of the rotor.
In order to extract the output of the rotating electrical machine from the core of the rotor and the central axis of the rotor, it is necessary to mechanically connect each core disposed on the outer periphery of the rotor and the central axis. However, in order to prevent the magnetic flux of the embedded permanent magnet from leaking into the rotor and causing a short circuit, a structure has been proposed in which a member connecting the core and the central shaft is made thin and long, the magnetic resistance of the portion is increased, and the leakage magnetic flux through the connecting member is reduced (see, for example, patent document 1).
Prior art documents
Patent document
Patent document 1: japanese patent No. 3772115 (FIG. 2)
Disclosure of Invention
Problems to be solved by the invention
The magnetic flux of the permanent magnet disposed in the rotor does not contribute to the output of the rotating electrical machine as long as it does not pass through the stator. Since the magnetic flux of the permanent magnet has an upper limit, the output of the rotating electric machine can be improved by reducing the leakage magnetic flux. In such a rotor, in order to further reduce the leakage magnetic flux and improve the characteristics of the rotating electric machine, it is necessary to increase the magnetic resistance of the connection portion connecting the central shaft and each of the cores. Since the coupling portion is integrally formed with the core from a steel plate of a ferromagnetic material, a method of reducing the cross-sectional area of the coupling portion or extending the coupling portion is effective in order to increase the magnetic resistance.
On the other hand, the coupling portion needs to be able to receive a centrifugal force generated when the rotor rotates at a high speed or a torque generated in the outer peripheral portion of the rotor. There is a trade-off relationship as follows: when the cross-sectional area of the coupling portion is reduced or the coupling portion is extended in order to improve the magnetic characteristics, the rigidity and strength of the coupling portion may be reduced, and the coupling portion may not be able to withstand the centrifugal force and the torque; on the contrary, if the connection portion is made strong enough to withstand centrifugal force or torque, leakage flux passing through the connection portion increases, and the characteristics of the rotating electrical machine deteriorate.
The present invention has been made to solve the above-described problems, and an object thereof is to provide a rotating electric machine including a rotor having a rotor core with less leakage magnetic flux and high rigidity.
Means for solving the problems
The rotating electric machine of the invention comprises a stator, a cylindrical permanent magnet type rotor rotating inside the stator, and a frame for accommodating the stator,
the rotor includes a rotor core, a plurality of permanent magnets, and a rotating shaft,
the rotor core includes:
an annular laminated annular portion that is present on an inner circumferential side of the rotor core and that is fitted to the rotating shaft;
a laminated fan-shaped portion having a fan-shaped cross section perpendicular to an axial direction, the laminated fan-shaped portion being present on an outer peripheral side of the rotor core and sandwiched by the two permanent magnets from both side surfaces in a circumferential direction; and
a lamination connection portion connecting the lamination annular portion and the lamination fan-shaped portion to each other at an inclination with respect to a radial direction,
the permanent magnets adjacent in the circumferential direction are arranged between the laminated fan-shaped portions at equal intervals in the circumferential direction, and magnetized oppositely in the circumferential direction.
Effects of the invention
According to the rotating electric machine of the present invention, the laminated connecting portion is disposed at an angle with respect to the radial direction, so that the length of the laminated connecting portion can be increased, the magnetic resistance of the laminated connecting portion can be increased, and the leakage flux of the rotor core can be reduced.
Drawings
Fig. 1 is a view showing a cross section of a rotating electric machine according to embodiment 1 of the present invention.
Fig. 2 is an exploded perspective view of a rotor according to embodiment 1 of the present invention.
Fig. 3 is a cross-sectional view of a rotor according to embodiment 1 of the present invention, taken perpendicular to the axial direction.
Fig. 4 is a view showing a cross section of a rotor according to embodiment 1 of the present invention.
Fig. 5 is a view showing a cross section of a rotor according to embodiment 2 of the present invention.
Fig. 6 is a view showing a cross section of a rotor according to embodiment 3 of the present invention.
Fig. 7 is a view showing a cross section of a rotor according to embodiment 3 of the present invention.
Fig. 8 is a perspective view of a rotor core according to embodiment 1 of the present invention, in which a portion of one pole is cut out.
Fig. 9 is a cross-sectional view of a rotor according to embodiment 1 of the present invention, taken perpendicular to the axial direction.
Detailed Description
Hereinafter, a rotating electric machine 100 according to embodiment 1 of the present invention will be described with reference to the drawings. In the present specification, unless otherwise specified, the terms "axial direction", "circumferential direction", "radial direction", "inner peripheral side", "outer peripheral side", "inner peripheral surface" and "outer peripheral surface" refer to the "axial direction", "circumferential direction", "radial direction", "inner peripheral side", "outer peripheral side", "inner peripheral surface" and "outer peripheral surface" of the rotor, respectively.
Fig. 1 is a view showing a cross section perpendicular to the axial direction of the rotating electric machine 100.
The rotating electric machine 100 includes a motor frame 2, a cylindrical stator 3 fixed in the motor frame 2, and a rotor 6 having an outer peripheral surface facing an inner peripheral surface of the stator 3 and rotating. The stator 3 is a member in which a stator winding 32 is wound around a stator core 31. An insulating member for preventing an electrical short between the stator core 31 and the stator winding 32 is disposed between the two, but is omitted in this drawing. The stator winding 32 is formed of a group of three or more multi-phase windings, and rotates the rotor 6 by passing a predetermined current through the windings of each phase in sequence in accordance with the phase of the rotor 6 using a control device (not shown).
The rotor 6 is disposed with a certain gap from the inner circumferential surface of the stator 3. The rotor 6 is composed of a rotor core 60, a permanent magnet 8, and a rotating shaft 65. The rotor core 60 is configured by an annular laminated annular portion 61 that is present on the innermost circumferential side and fitted to the rotating shaft 65, a laminated fan-shaped portion 62 that is present on the outermost circumferential side and sandwiched between the two permanent magnets 8 from both circumferential side surfaces, and a laminated connecting portion 63 that connects the laminated annular portion 61 and the laminated fan-shaped portion 62 to each other at an inclination with respect to the radial direction. That is, an even number of the lamination fan-shaped portions 62 are arranged in the circumferential direction, and a space for assembling the permanent magnet 8 is formed between them.
Since the rotational torque generated in the rotor 6 is output to the outside via the rotating shaft 65, the laminated annular portion 61 and the rotating shaft 65 need to be mechanically fixed firmly so as to be able to receive the rotational torque. As a fixing method, a means of press-fitting, welding, or assembling a rotation-preventing key may be employed.
The rotating shaft 65 is supported by bearings, not shown, so as to be rotatable with respect to the stator 3 and the motor frame 2. In the rotor 6, an even number of permanent magnets 8 are assembled between the laminated fan-shaped portions 62 of the rotor cores 60 adjacent in the circumferential direction, and the magnetic poles face in a direction perpendicular to the radial direction of the rotor 6, that is, in the tangential direction of the rotor 6. The magnetic poles of the circumferentially adjacent permanent magnets 8 are oppositely magnetized in the circumferential direction, and the laminated fan-shaped portion 62 sandwiched between the two permanent magnets 8 functions as a magnetic pole of the rotor 6.
In addition, in the rotor in which the permanent magnets are incorporated, there are various types of arrangement of the permanent magnets, but in the present invention, as shown in fig. 1, the following arrangement is targeted: the permanent magnets 8 are radially arranged inside the rotor core 60, and their magnetic poles are oriented in the tangential direction of the rotor 6.
Fig. 2 is an exploded perspective view of the rotor 6 excluding the rotation shaft 65.
Fig. 2 is a view obtained by disassembling the structure of the rotor core 60 and the arrangement of the permanent magnets 8 so as to be clear, and shows that the rotor core 60 is configured by laminating thin plates in the axial direction and rectangular parallelepiped permanent magnets 8 are radially fitted into the rotor core 60 from the axial direction.
Fig. 3 and 9 are cross-sectional views of the rotor 6 taken perpendicular to the axial direction.
Fig. 4(a) is a view showing a cut surface obtained by cutting the rotor 6 at a portion of the thin plate 7a (first thin plate) perpendicular to the axial direction.
Fig. 4(b) is a view showing a cut surface obtained by cutting the rotor 6 at a portion of the thin plate 7b (the thin plate having a shape obtained by inverting the first thin plate in the axial direction, which is also referred to as a first inverted thin plate) perpendicular to the axial direction.
The rotor core 60 is formed by laminating a plurality of thin plates 7a and 7b (generally, steel plates) made of a ferromagnetic material. The thin plates 7a and 7b are formed of annular portions 71a and 71b, which are portions to be laminated annular portions 61 of the rotor core 60, fan-shaped portions 72a and 72b, which are portions to be laminated fan-shaped portions 62, and coupling portions 73a and 73b, which are portions to be laminated coupling portions 63, respectively. The thin plates 7a and 7b are substantially the same-shaped members. That is, the thin plate 7b is a member in which the thin plate 7a is turned over in the axial direction. The connection portion 73a of the thin plate 7a connecting the annular portion 71a and the fan-shaped portion 72a is inclined at a predetermined angle in the clockwise direction with respect to the radial direction of the rotor 6, i.e., the line C1-C2 connecting the center of the rotor 6 to the center of the fan-shaped portion 72a shown in fig. 4 (a). Therefore, the coupling portion 73b of the sheet 7b turned back and forth is inclined by a predetermined angle in the counterclockwise direction. In this way, the coupling portions 73a and 73b are inclined in opposite directions with respect to the radial direction of the rotor 6.
The rotor core 60 is formed by laminating these two types of thin plates 7a and 7b in parallel. Fig. 2 shows a state in which the thin plates 7a and the thin plates 7b are alternately laminated into thin plates 7a-7b-7a-7b … in such a manner that each thin plate is laminated. The mode of stacking the thin plates 7a and 7b is not limited to this, and the thin plates 7a and 7b may be stacked so that the thin plates 7a and 7b are replaced by a predetermined number, and for example, when the thin plates 7a to 7b to 7a to … are stacked for each three pieces.
The layers of the rotor core 60 are fixed to each other between the thin plates 7a, 7b stacked adjacently. The following methods are generally used: the axially stacked thin plates 7a, 7b are fixed to each other by press-caulking portions (pull-out きかしめ) provided in the fan-shaped portions 72a, 72b and the annular portions 71a, 71 b. In this case, strictly speaking, since the thin plate 7b is a member in which the thin plate 7a is turned over in the axial direction, the uneven portion used in caulking is inverted in shape. The thin plates 7a and 7b may be fixed to each other by a fixing method such as welding or bonding.
In addition, generally, the stator core 31 is also configured by laminating thin plates in the same manner, but the thin plates used for the stator core 31 have an insulating coating on the surfaces of the plate materials to electrically insulate the laminated thin plates from each other. This makes it difficult for eddy current to be generated in stator core 31, thereby reducing loss due to eddy current. As for the thin plates 7a and 7b used for the rotor core 60, thin plates having an insulating coating may be used similarly to the stator core 31, but in the case of the rotor core 60, thin plates not having an insulating coating may be used.
The magnetic flux of the permanent magnet 8 does not contribute to the output of the rotating electrical machine 100 as long as it does not pass through the stator 3. Since the magnetic flux of the permanent magnet 8 has an upper limit, the output of the rotating electrical machine 100 can be increased by reducing the magnetic flux short-circuited on the inner peripheral side of the permanent magnet 8 as shown by the leakage magnetic flux T in fig. 3.
In order to reduce the leakage magnetic flux T, a method of increasing the magnetic resistance of the path of the magnetic flux leakage is effective. As this method, a method of reducing the radial thickness of the laminated annular portion 61 to increase the magnetic resistance of the laminated annular portion 61 may be considered. However, since the rotating shaft 65 is generally disposed without a gap inside the laminated annular portion 61 and iron as a ferromagnetic body is used for the rotating shaft 65, the leakage magnetic flux T passes not only through the laminated annular portion 61 of the rotor core 60 but also through a path passing through the rotating shaft 65. Therefore, even if the radial thickness of the laminated annular portion 61 is reduced, a large effect cannot be obtained finally, and a method of increasing the magnetic resistance of the laminated connecting portion 63 is the most effective means for improving the characteristics of the rotating electrical machine 100.
On the other hand, the lamination connection portion 63 connects the lamination fan-shaped portion 62 and the lamination annular portion 61, and is required to be able to receive a centrifugal force acting on the lamination fan-shaped portion 62 and the permanent magnet 8 when the rotor 6 rotates, and to have the following functions: the rotational torque acting on the laminated fan-shaped portion 62 is transmitted to the laminated annular portion 61 and is output from the rotating shaft 65.
Therefore, if the sectional area of the laminated connecting portion 63 is simply reduced, the rigidity in the torsional direction between the outer peripheral portion of the rotor 6 including the laminated fan-shaped portion 62 and the permanent magnet 8 and the laminated annular portion 61 is reduced.
Therefore, in the present embodiment, by providing the lamination coupling portion 63 connecting the lamination annular portion 61 and the lamination fan-shaped portion 62 to each other obliquely with respect to the radial direction, the length of the lamination coupling portion 63 can be increased to increase the magnetic resistance of the portion. By using the thin plate 7a and the thin plate 7b having a shape in which the thin plate 7a is turned in the axial direction, the laminated connecting portion 63 connecting the laminated annular portion 61 and the laminated fan-shaped portion 62 is configured by the connecting portions 73a and 73b having different angles with respect to the radial direction.
Next, the structure of the laminated connecting portion will be described in detail.
Fig. 8 is a perspective view of rotor core 60 with a portion of one pole cut out.
The lamination coupling portion 63 that couples the lamination annular portion 61 and the lamination fan-shaped portion 62 is constituted by coupling portions 73a and 73b that are angled differently with respect to the radial direction. As shown in fig. 3 and 8, when the laminated annular portion 61 and the laminated coupling portion 63 are viewed from the axial direction, a substantially triangular shape having two sides of the coupling portions 73a and 73b and the remaining one side of the outer peripheral edge of the laminated annular portion 61 can be observed. Further, since the triangular portions are stacked in the axial direction, it can be considered that the stacked annular portion 61 and the stacked connecting portion 63 are joined together to form a substantially triangular prism. However, the two surfaces formed by the coupling portions 73a and 73b do not form a complete plane even when they are laminated, and become ladder-shaped surfaces. This can improve the rigidity of the laminated connecting portion 63.
Preferably, the coupling portion 73a connected to one of the laminated fan-shaped portions 62 does not overlap the coupling portion 73b of the laminated fan-shaped portion 62 adjacent in the circumferential direction in the axial direction. The reason for this will be described below.
The lamination connection portion 63 is provided to reduce leakage magnetic flux generated between the lamination fan-shaped portions 62 adjacent in the circumferential direction. The leakage magnetic flux flows in the following path: the path passes from the laminated fan-shaped portion 62 through the connecting portions 73a and 73b and the laminated annular portion 61, and passes through the connecting portions 73a and 73b connected to the circumferentially adjacent laminated fan-shaped portions 62. At this time, if the coupling portion 73a and the coupling portion 73b are arranged at positions overlapping in the axial direction on the laminated annular portion 61 side, the magnetic flux flows in the laminating direction at the overlapping positions.
That is, the leakage magnetic flux passes directly from the coupling portion 73a through the path short-circuited in the axial direction and reaches the coupling portion 73b without passing through the laminated annular portion 61. Therefore, the length of the path of the leakage magnetic flux is significantly shortened, and the effect of the laminated connecting portion 63, which reduces the leakage magnetic flux, is significantly impaired.
As shown in fig. 9, the angle P is an angle formed by the center line R1 and the center line R2 in the radial direction of each of the two laminated fan-shaped portions 62 adjacent in the circumferential direction. When the number of poles of the rotor 6 is N, the angle P is 360 °/N.
The angle Q is an angle formed by a line R3 connecting the circumferential outer portion of the portion where the laminated coupling portion 63 and the laminated annular portion 61 are connected to the center of the rotor 6 and a center line R1 in the radial direction of the laminated fan-shaped portion 62, and the line R3 is a line. In order to prevent the circumferentially adjacent laminated connecting portions 63 from overlapping each other in the axial direction on the center side of the rotor 6, the angle Q must satisfy Q < P/2.
As shown in fig. 2 and 9, it is preferable that circular-arc chamfered portions F be provided at both circumferential ends of the connecting portions between the connecting portions 73a and 73b of the thin plates 7a and 7b and the annular portions 71a and 71b and the fan-shaped portions 72a and 72 b. The laminated connection portion 63 has a function of transmitting torque generated in the laminated fan-shaped portion 62 to the rotor 6 via the laminated annular portion 61. When the torque acts, the portion where the internal stress of the laminated connecting portion 63 becomes maximum is the portion where the respective connecting portions 73a and 73b are connected to the annular portions 71a and 71b and the fan-shaped portions 72a and 72 b. Since these portions have a cross-sectional area that greatly changes in a direction perpendicular to the axial direction of rotor core 60, a large force is borne by stress concentration. By providing the chamfered portions F in these portions, the change in the cross-sectional area is smoothed and stress concentration is reduced, so that the widths of the coupling portions 73a and 73b can be further narrowed, and the effect of reducing the leakage magnetic flux can be improved.
According to the rotating electric machine according to embodiment 1 of the present invention, the leakage flux T passes through the laminated connecting portion 63 and the laminated annular portion 61. By extending the length of the laminated connecting portion 63 and arranging it obliquely with respect to the radial direction, the thickness of the laminated connecting portion 63 can be made small, and the magnetic resistance of the laminated connecting portion 63 can be increased, whereby the leakage magnetic flux T can be reduced.
Further, since the circumferentially adjacent laminated coupling portions 63 do not overlap in the axial direction on the center side of the rotor 6, leakage flux can be prevented from leaking in the axial direction at the laminated coupling portions 63.
In addition, in the case of only the thin plates 7a and 7b, the connecting portions 73a and 73b connected to the fan-shaped portions 72a and 72b are provided at one position, respectively, but the thin plates 7a and 7b are fixed to each other in the laminated rotor core 60. As a result, as shown in fig. 3, the laminated connecting portion 63 is formed into a substantially triangular prism and is integrated therewith. At this time, the coupling portions 73a and 73b alternately intersect obliquely, and the rigidity of the rotor core 60 against torsion can be improved.
Hereinafter, a rotating electric machine according to embodiment 2 of the present invention will be described with reference to the drawings, focusing on differences from embodiment 1.
The rotor core of the present invention is configured by laminating a plurality of thin plates of a ferromagnetic body, for example, steel plates, in the axial direction. Depending on centrifugal force and rotational torque acting on the laminated fan-shaped portion on the outer peripheral portion of the rotor and the permanent magnets, strength and rigidity may be satisfied without providing a connecting portion on all the laminated thin plates.
Fig. 5 is a view showing a cut surface obtained by cutting the rotor 206 of the present embodiment at a layer having no connection portion, perpendicular to the axial direction. The rotor core 260 is configured by laminating four types (three types in substance because the thin plates 7a and 7b are turned only in the axial direction) of the thin plates 7a and 7b (not shown in fig. 5) described in embodiment 1, the thin plate 7c1 (second thin plate) added in the present embodiment, and the thin plate 7c2 (third thin plate). The thin plate 7c1 is a thin plate that is formed by stacking the annular portions 61, and has the same shape as the annular portions 71a and 71b described in embodiment 1. Similarly, the thin plate 7c2 is a thin plate in which the fan-shaped portions 62 are laminated, having the same shape as the fan-shaped portions 72a and 72 b.
The rotor core 260 is formed by stacking these thin plates 7a, 7b, 7c1, and 7c2 in parallel. Further, the thin plates 7c1 and 7c2 are used in combination in the same layer.
The two types of thin plates 7a and 7b are stacked in the same number, and the layers of the thin plates 7c1 and 7c2 are sandwiched therebetween. For example, the thin plates 7a, 7b, 7c1+7c2, 7a, 7b, 7c1+7c2 …, or the thin plates 7a, 7b, 7c1+7c2, 7a, 7b, 7c1+7c2 … are stacked in this order.
Since the thin plate 7c1 and the thin plate 7c2 do not have a connecting portion, the rotor core cannot be configured only by using the thin plates 7c1 and 7c 2. However, since the thin plates 7a and 7b of the rotor core 260 are fixed to each other between the layers, the thin plates 7c1 and 7c2 are stacked together with the thin plates 7a and 7b, and thus, the thin plates 7c1 and 7c2 are not displaced in the radial direction by centrifugal force.
In the first example, the number of thin plates 7c1 and 7c2 having no connecting portion among the laminated thin plates is 1/3 as a whole, so that the strength of the connecting portion of the rotor core 260 is reduced to 2/3, compared to the case where the laminated core is laminated without using the thin plates 7c1 and 7c 2. However, even if the strength is reduced to 2/3, there is no problem at all as long as the strength required as the rotor core 260 is satisfied.
The mode of stacking the thin plates is not limited to the above example, and a combination of the thin plates 7c1 and 7c2 (japanese patent No.: セット) having no connecting portion may be stacked in parallel. The ratio of the layers of the thin plates 7c1 and 7c2 to be mixed can be determined from the strength of the connection portion required for the rotor core 260.
As in the second example, if the ratio of the layer formed of the thin plate 7c1 and the thin plate 7c2 is 1/5, the strength becomes 4/5 compared to the case where the thin plates 7c1 and 7c2 are not both present. Further, instead of changing the laminated thin plates for each thin plate, a plurality of thin plates of the same kind may be laminated.
Hereinafter, a rotating electric machine according to embodiment 3 of the present invention will be described with reference to the drawings, focusing on differences from embodiments 1 and 2.
Fig. 6(a) and 7(a) are views showing a cut surface obtained by cutting the rotor 306 at a portion of the thin plate 307a perpendicular to the axial direction.
Fig. 6(b) and 7(b) are views showing a cut surface obtained by cutting the rotor 306 at a portion of the thin plate 307b perpendicular to the axial direction.
Fig. 6(a) to 7(b) show the structure of a thin plate among the four layers constituting the rotor 306.
Here, the layer shown in fig. 6(a) is a layer S1 (first layer), the layer shown in fig. 6(b) is a layer S2 (second layer), the layer shown in fig. 7(a) is a layer S3 (third layer), and the layer shown in fig. 7(b) is a layer S4 (fourth layer).
The thin plate 307a (fourth thin plate) and the thin plate 7c2 (third thin plate) used in embodiment 2 are used in the layer S1. In addition, the sheet 307b and the sheet 7c2 were used in the layer S2. The layer S3 has the same structure as the layer S1, but is disposed at a position where the thin plate 307a and each thin plate 7c2 are offset clockwise by an amount corresponding to one fan-shaped portion 372a with respect to the layer S1. The layer S4 has the same structure as the layer S2, but is disposed at a position where the thin plate 307b and each thin plate 7c2 are offset clockwise by an amount corresponding to one fan-shaped portion 372b with respect to the layer S2. When the thin plate 307a is turned upside down, the thin plate 307a becomes a thin plate 307 b.
The connection portion 373a of the thin plate 307a, which connects the annular portion 371a and the fan-shaped portion 372a, is inclined at a predetermined angle clockwise with respect to the radial direction of the rotor 6. Therefore, the linking portion 373b of the thin plate 307b turned back and forth is inclined by a predetermined angle in the counterclockwise direction. In this way, as in embodiment 1, the directions of inclination of the linking portion 373a and the linking portion 373b with respect to the radial direction are opposite.
Further, a thin plate 7c2 formed only by the fan-shaped portions 372c is provided between the fan-shaped portions 372a and 372b of the thin plates 307a and 307b in the circumferential direction. Therefore, when focusing on the fan-shaped portions of the same layer, only half of the fan-shaped portions are connected to the annular portions 371a and 371b every other fan-shaped portion. That is, when numbers from P1 to P14 are assigned to the fan-shaped portions as shown in fig. 6(a) and (b), only the even-numbered fan-shaped portions 372a and 372b are connected to the ring-shaped portions 371a and 371b in the layers S1 and S2, and only the odd-numbered fan-shaped portions 372a and 372b are connected to the ring-shaped portions 371a and 371b in the layers S3 and S4 as shown in fig. 7(a) and (b). In the present embodiment, the annular portions 371a, 371b are laminated annular portions, the fan-shaped portions 372a, 372b, 372c are laminated fan-shaped portions, and the linking portions 373a, 373b are laminated linking portions.
The rotor core 360 is constituted by these four layers.
The lamination pattern may be, for example, a case where the layers are arranged as layers S1, S2, S3, and S4 for each layer, or a case where the layers are arranged as layers S1, S1, S2, S2, S3, S3, S4, and S4 … for a plurality of layers (two layers in this case).
In any case, four layers are stacked in substantially the same number. Although the lamination is performed by substantially the same number, when the number of layers of the rotor core 360 determined from the length of the rotor core 360 in the axial direction and the thicknesses of the thin plates 307a and 307b is not a multiple of four, the number of blocks may vary depending on the type of the thin plate.
As shown in fig. 6 and 7, in the present embodiment, a fourteen-pole rotor 306 is described as an example. As shown in fig. 6 b, the magnetic poles of the permanent magnets 8 face the circumferential direction (tangential direction) of the rotor, and the polarities of the permanent magnets 8 adjacent in the circumferential direction are opposite to each other. Therefore, the fan-shaped portions 372a and 372b and the thin plate 7c2 having the same shape as the fan-shaped portions 372a and 372b, which are sandwiched by the permanent magnet 8, are arranged in the circumferential direction as an N pole, an S pole, an N pole, and an S pole …. In the case of fig. 6(b), the polarities are alternately changed in the order of N pole at P1 and S pole at P2, and the odd-numbered fan-shaped portions are N poles and the even-numbered fan-shaped portions are S poles.
The reason why the connecting portion connecting the fan-shaped portion and the annular portion is made slender is to reduce the leakage magnetic flux inside the rotor. However, leakage of magnetic flux occurs between different magnetic poles, and for example, in the case from N pole to N pole, the magnetic flux does not leak.
Therefore, if the fan-shaped portions alternately having different polarities are connected to the annular portion every other one, the fan-shaped portions connected to the annular portion will have the same polarity as long as the fan-shaped portions are limited to the layer. Since magnetic flux does not leak between the magnetic poles of the same polarity, the leakage magnetic flux passing through the coupling portion can be further reduced.
In addition, as in embodiment 1, the torsional rigidity of the rotor core 360 can be improved by laminating two types of thin plates 307a and 307b in which the angles of the connecting portions 373a and 373b are changed. However, as described above, when focusing attention on one layer, since the connecting portions 373a and 373b are connected to the fan-shaped portions only every other one, four layers in total of two kinds, which are offset by an amount corresponding to one fan-shaped portion in the circumferential direction and which connect the remaining half of the fan-shaped portions as viewed in the axial direction, are required.
According to the rotating electric machine according to embodiment 3 of the present invention, the rotor core 360 is formed of four layers using three types of thin plates, whereby the leakage flux in the rotor core 360 via the connecting portions 373a and 373b can be further reduced. Further, a layer composed of only the annular portion and the fan-shaped portion may be separately provided as in embodiment 2.
In the present invention, the embodiments may be freely combined or appropriately modified and omitted within the scope of the technical means.
Claims (5)
1. A rotating electric machine comprising a stator, a cylindrical permanent magnet type rotor rotating inside the stator, and a frame housing the stator,
the rotor includes a rotor core, a plurality of permanent magnets, and a rotating shaft,
the rotor core includes:
an annular laminated annular portion that is present on an inner circumferential side of the rotor core and that is fitted to the rotating shaft;
a laminated fan-shaped portion having a fan-shaped cross section perpendicular to an axial direction, the laminated fan-shaped portion being present on an outer peripheral side of the rotor core and sandwiched by the two permanent magnets from both side surfaces in a circumferential direction; and
a lamination connection portion connecting the lamination annular portion and the lamination fan-shaped portion to each other at an inclination with respect to a radial direction,
the permanent magnets adjacent in the circumferential direction are arranged between the laminated fan-shaped portions at equal intervals in the circumferential direction and magnetized oppositely in the circumferential direction,
the first thin plate constituting the rotor core has an annular portion that becomes the laminated annular portion, a fan-shaped portion that becomes the laminated fan-shaped portion, and a connecting portion that becomes the laminated connecting portion,
the rotor core includes a first reversed thin plate having a shape in which the first thin plate is reversed in an axial direction.
2. The rotating electric machine according to claim 1,
the first layer constituting the rotor core is made up of a fourth thin plate having an annular portion that is a portion to become the laminated annular portion, a fan-shaped portion that is a portion to become the laminated fan-shaped portion every other portion in the circumferential direction, and a connecting portion that is a portion to become the laminated connecting portion, and a third thin plate that is arranged between the adjacent fan-shaped portions of the fourth thin plate, has the same shape as the fan-shaped portions, and becomes the remaining laminated fan-shaped portions,
a second layer constituting the rotor core is formed by turning over the third thin plate and the fourth thin plate constituting the first layer in an axial direction,
a third layer constituting the rotor core is formed by rotating the third thin plate and the fourth thin plate constituting the first layer by an amount corresponding to one of the fan-shaped portions in a circumferential direction,
a fourth layer constituting the rotor core is formed by axially inverting the third thin plate and the fourth thin plate constituting the third layer.
3. The rotating electric machine according to claim 1,
the layers constituting the rotor core include a layer composed only of a second thin plate having the same shape as the annular portion and serving as the laminated annular portion, and a third thin plate having the same shape as the fan-shaped portion and serving as the laminated fan-shaped portion.
4. The rotating electric machine according to claim 2,
the layers constituting the rotor core include a layer composed only of a second thin plate and the third thin plate, the second thin plate having the same shape as the annular portion and forming the laminated annular portion.
5. The rotating electric machine according to any one of claims 1 to 4,
the circumferentially adjacent laminated connecting portions do not overlap each other in the axial direction on the center side of the rotor.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2016-172431 | 2016-09-05 | ||
| JP2016172431 | 2016-09-05 | ||
| PCT/JP2017/030357 WO2018043288A1 (en) | 2016-09-05 | 2017-08-24 | Dynamo-electric machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109643921A CN109643921A (en) | 2019-04-16 |
| CN109643921B true CN109643921B (en) | 2020-10-27 |
Family
ID=61300881
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201780038591.3A Active CN109643921B (en) | 2016-09-05 | 2017-08-24 | Rotating electrical machine |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP6591079B2 (en) |
| CN (1) | CN109643921B (en) |
| WO (1) | WO2018043288A1 (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPWO2020017189A1 (en) * | 2018-07-18 | 2021-09-24 | ミネベアミツミ株式会社 | Motors and motor manufacturing methods |
| JP7308645B2 (en) * | 2019-04-02 | 2023-07-14 | 三菱電機株式会社 | Rotating electric machine |
| CN111416451A (en) * | 2020-05-09 | 2020-07-14 | 湖州南洋电机有限公司 | High-performance motor rotor core |
| JP7325645B2 (en) * | 2020-07-09 | 2023-08-14 | 三菱電機株式会社 | Rotating electric machine and manufacturing method of rotating electric machine |
| US12294243B2 (en) * | 2020-08-20 | 2025-05-06 | Mitsubishi Electric Corporation | Rotating electric machine |
| JP2023005393A (en) | 2021-06-29 | 2023-01-18 | ミネベアミツミ株式会社 | rotor and motor |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103973003A (en) * | 2014-04-24 | 2014-08-06 | 广东威灵电机制造有限公司 | Rotor punching sheet, rotor core with same and motor |
| CN105720716A (en) * | 2014-12-05 | 2016-06-29 | 莱克电气股份有限公司 | Tangential permanent magnetic rotor and motor |
| CN105932800A (en) * | 2015-02-27 | 2016-09-07 | 日本电产株式会社 | Motor |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4495802B2 (en) * | 1999-08-19 | 2010-07-07 | 日本電産シバウラ株式会社 | Permanent magnet rotor |
| JP2006158008A (en) * | 2004-11-25 | 2006-06-15 | Asmo Co Ltd | Permanent magnet embedded rotor and dynamo-electric machine |
| JP2013198304A (en) * | 2012-03-21 | 2013-09-30 | Meidensha Corp | Rotor structure of permanent magnet type rotary machine |
| US9362792B2 (en) * | 2012-10-15 | 2016-06-07 | Regal Beloit America, Inc. | Radially embedded permanent magnet rotor having magnet retention features and methods thereof |
| JP6385712B2 (en) * | 2014-04-30 | 2018-09-05 | マブチモーター株式会社 | Rotor and brushless motor |
-
2017
- 2017-08-24 WO PCT/JP2017/030357 patent/WO2018043288A1/en active Application Filing
- 2017-08-24 JP JP2018537203A patent/JP6591079B2/en active Active
- 2017-08-24 CN CN201780038591.3A patent/CN109643921B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103973003A (en) * | 2014-04-24 | 2014-08-06 | 广东威灵电机制造有限公司 | Rotor punching sheet, rotor core with same and motor |
| CN105720716A (en) * | 2014-12-05 | 2016-06-29 | 莱克电气股份有限公司 | Tangential permanent magnetic rotor and motor |
| CN105932800A (en) * | 2015-02-27 | 2016-09-07 | 日本电产株式会社 | Motor |
Also Published As
| Publication number | Publication date |
|---|---|
| JP6591079B2 (en) | 2019-10-16 |
| WO2018043288A1 (en) | 2018-03-08 |
| CN109643921A (en) | 2019-04-16 |
| JPWO2018043288A1 (en) | 2018-12-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109643921B (en) | Rotating electrical machine | |
| US7528519B2 (en) | Permanent magnet rotary motor | |
| US10110076B2 (en) | Single-phase brushless motor | |
| US7750523B2 (en) | Embedded magnet type motor | |
| JP5382156B2 (en) | Rotating electric machine | |
| JP6597184B2 (en) | Permanent magnet type motor | |
| WO2009081766A1 (en) | Motor and rotor for dynamo-electric machine | |
| WO2013011782A1 (en) | Rotary electric machine | |
| JP2000308287A (en) | Permanent magnet embedded type reluctance motor | |
| WO2017195498A1 (en) | Rotor and rotary electric machine | |
| JP2008193809A (en) | Embedded magnet type motor | |
| KR20160108589A (en) | Rotor of permanent magnet motor | |
| KR20140039128A (en) | Permanent magnet-embedded motor and rotor thereof | |
| JP5006009B2 (en) | Embedded magnet type motor | |
| CN113615042B (en) | Rotating electric machines | |
| JP2004343886A (en) | Embedded magnet type motor | |
| JP6992299B2 (en) | Rotor | |
| JP4777822B2 (en) | Embedded magnet type motor | |
| JP2004222466A (en) | Embedded magnet type motor | |
| CN202068246U (en) | Novel electric motor with little magnetic flux leakage | |
| JP7308645B2 (en) | Rotating electric machine | |
| JP4758215B2 (en) | Embedded magnet type motor | |
| JP5639876B2 (en) | Rotating electric machine | |
| JP7325645B2 (en) | Rotating electric machine and manufacturing method of rotating electric machine | |
| JP2004222467A (en) | Embedded magnet type motor |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |