JP2002058184A - Rotor construction and motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotor construction and a motor which can be manufactured at a low cost. SOLUTION: The stator 2 of a motor 1 has an outer core 3 and an inner core 4, which comprises a plurality of steel sheets laminated axially. The rotor 10 of the motor 1 has a shaft 11, a spacer 12 and magnets 13 and the spacer 12 comprises a plurality of thin steel sheets 14 punched out from steel sheets comprising the stator 2 and laminated axially. The spacer 12 is formed into a regular octagonal pillar and has eight outer surfaces 12b. The magnets 13 having cross-sections rectangular in directions perpendicular to the axial direction of the rotor are fixed to the outer surfaces 12b with an adhesive, etc. The magnets 13 are magnetized in the thickness direction, and the polarities of the inner surface sides only are shown in the Figure. Eight calked parts 16 are formed near the through-holes 12a of the respective steel sheets 14 in line passing the gravity centers of the respective magnets 13 and the center O of the shaft 11 with the same angular intervals.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotor structure and an electric motor.

[0002]

2. Description of the Related Art Conventionally, a rotor of a rotating magnetic field type motor having a structure in which a magnet is fixed on the surface of a spacer generally has a structure in which the inner and outer circumferences of the magnet are arc-shaped.
As disclosed in Japanese Patent No. 42548, a structure in which only the outer periphery has an arc shape has been proposed. The spacer is made of steel as a magnetic material. The spacer is manufactured by cold forging or the like separately from the stator, and has a structure in which the magnet is fixed to the surface. The spacer thus formed is pressed into the rotating shaft.

Further, in order to reduce the manufacturing cost, as a rotor of a rotating magnetic field type motor in which steel sheets are laminated to form a spacer, and caulking portions provided on the steel sheets are caulked to fix the steel sheets together, for example, Japanese Patent Laid-Open No. The one disclosed in Japanese Patent No. 78482 is known. In this rotor, the swaged portion is formed near the magnet in order to expand the outer peripheral portion of the steel plate radially outward.

[0004]

However, in the conventional structure, there is a problem in that the production of the arc-shaped portion is polished or the like at the time of manufacturing the magnet, so that the number of processing steps is increased, and as a result, the cost is increased. In addition, since the spacer is manufactured separately from the stator, there is a problem that the processing time and material cost of the spacer are extra and the cost is increased. Furthermore, when forming a spacer by laminating steel plates, providing a caulked portion on the steel plate in the vicinity of the magnet blocks the magnetic path of the magnet,
Since the reluctance increases, there is a problem that the rotational efficiency of the rotor decreases.

The present invention has been made to solve the above problems, and a first object of the present invention is to provide a rotor structure which can be manufactured at low cost. And
A second object is to provide a motor that can be manufactured at low cost.

[0006]

Means for Solving the Problems In order to achieve the first object, the invention according to claim 1 is characterized in that a rotating shaft, a spacer that rotates integrally with the rotating shaft, and an outer surface of the spacer. In a rotor including a plurality of magnets, the spacer is formed in a polygonal column shape having a plurality of outer surfaces by stacking thin plates made of a magnetic material, and the magnet fixed to the outer surface is a rotor of the rotor. Each of the thin plates is provided with a caulking portion connecting the respective thin plates, and the caulking portion is disposed at a position where the magnetic flux density between the magnets adjacent to each other in the rotation direction of the rotor is small. It is assumed that it is established. According to the present invention, since the magnet is flat, the manufacturing cost is reduced. Each thin plate is connected by caulking a caulking portion without using, for example, an adhesive. Since the caulked portion is provided at a location where the magnetic flux density is low, the magnetic resistance does not increase. Therefore,
The rotor can be manufactured at low cost without lowering the rotation efficiency of the rotor.

According to a second aspect of the present invention, in the first aspect, the caulking portion is arranged near the rotation axis. According to the present invention, the caulked portion is arranged near the rotation axis having a small magnetic flux density. Therefore, the magnetic resistance does not increase and the rotational efficiency of the rotor does not decrease.

According to a third aspect of the present invention, there is provided a rotor including a rotating shaft, a spacer integrally rotating with the rotating shaft, and a plurality of magnets fixed to an outer surface of the spacer. By laminating thin plates made of wood,
The magnet fixed to the outer surface is formed in a polygonal column shape having a plurality of outer surfaces, and the magnet is formed in a square shape when viewed from the axial direction of the rotor, and the spacer and the magnet are arranged in the axial direction by n (where n is (An integer of 2 or more), and the divided portions are arranged at predetermined angles in the same rotation direction between adjacent portions in the axial direction, and the thin plate has a through hole which can be positioned by a jig. However, the gist of the present invention is that they are arranged at the predetermined angle. According to the invention,
The divided portion of the spacer is positioned by inserting the jig into the through-hole at the time of assembly, and thus can be easily positioned. Since the magnet is flat, the manufacturing cost is reduced. A rotor whose cogging torque is reduced by the shift of the predetermined angle can be manufactured at low cost.

According to a fourth aspect of the present invention, in the third aspect of the invention, each magnet provided in each of the divided portions is symmetrical with respect to a plane including the center of gravity and the center of the rotation axis. The through holes formed and formed in different portions divided in the axial direction are disposed at equal distances on different rotation direction sides with respect to the plane, and are disposed closer to the rotation axis. That is the gist. According to the present invention, even if the through-hole exists, the magnetic balance is maintained, and the magnetic resistance does not increase. Therefore, the cogging torque of the rotor is further reduced, and the rotation efficiency is further improved.

According to a fifth aspect of the present invention, in the fourth aspect of the present invention, each of the thin plates is provided with a caulking portion for connecting the respective thin plates, and the caulking portion is adjacent to the rotating direction of the rotor. The gist of the present invention is that the magnets are disposed at locations where the magnetic flux density between the magnets is small. According to the present invention, similarly to the first aspect of the invention, the magnetic resistance does not increase even if the caulked portion exists.

According to a sixth aspect of the present invention, in the fifth aspect of the invention, each magnet provided in each of the divided portions is formed symmetrically with respect to a plane including the center of gravity and the center of the rotation axis. The caulking portions formed in different portions divided in the axial direction are disposed at equal distances on different rotation directions with respect to the plane, and are disposed closer to the rotation axis. Is the gist. According to the present invention, the caulked portion is formed by balancing the magnetism, and the magnetic resistance does not increase. Therefore, the cogging torque of the rotor is reduced, and the rotation efficiency is further improved.

According to a seventh aspect of the present invention, there is provided a rotor including a rotating shaft, a spacer integrally rotating with the rotating shaft, and a plurality of magnets fixed to an outer surface of the spacer. A thin plate made of a magnetic material formed by stamping and forming a stator disposed on the outer periphery of the rotor is formed into a polygonal column shape having a plurality of outer surfaces by stacking thin plates formed of a material of an inner portion of the stator, The gist of the present invention is that the magnet fixed to the outer surface is formed in a rectangular shape when viewed from the axial direction of the rotor. According to the present invention, for example, the material cost is reduced as compared with the case where the spacer is formed separately from the stator. Therefore, the rotor can be manufactured at lower cost.

According to an eighth aspect of the present invention, in the first aspect of the present invention, the magnet is divided into m (where m is an integer of 1 or more) in a rotational direction. The spacer is formed in a polygonal prism shape having the same number of outer surfaces as the product of the number m of divisions thereof and the number P of magnetic poles of the magnet (P × m, where (P × m) is an even number of 8 or more). The gist is that According to the present invention, the average gap between the magnet and the stator is reduced, and the leakage flux is reduced. Therefore, the rotation efficiency of the rotor is improved.

[0014] In order to achieve the second object, a ninth aspect is provided.
The gist of the invention described in (1) is an electric motor having the rotor according to any one of claims 1 to 8. Therefore, according to the present invention, an electric motor can be manufactured at low cost.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) A first embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 shows a schematic configuration of a motor as a rotating magnetic field type electric motor according to the present embodiment. Stator 2 of motor 1
Has an outer core 3 and an inner core 4,
Reference numeral 4 is formed by stacking a plurality of steel plates in the axial direction.
The outer core 3 has an annular shape, and the inner core 4
It has nine teeth 4a that extend in the radial direction and are arranged at equal intervals (at “40 °” intervals) in the rotational direction.

The tip of the tooth 4a is connected to the outer core 3. The base end of the tooth 4a is mutually connected with the adjacent one, and the connection forms the annular portion 4b. A coil winding 5 is wound around each of the teeth 4a to form nine salient poles 6 for generating a rotating magnetic field. In the present embodiment, U, V,
The W-phase excitation coil is constituted by the coil winding 5.

On the other hand, the rotor 10 of the motor 1
1, a spacer 12 and a magnet 13, which are rotatably disposed inside the annular portion 4b of the stator 2. That is, the motor 1 of the present embodiment is a so-called inner rotor type rotating magnetic field type electric motor including the eight-pole magnet 13. The rotating shaft 11 is provided with a through hole 12 a provided at the center of the spacer 12.
Are inserted through. That is, the rotating shaft 11 is integrated with the spacer 12.

The spacer 12 is formed by stacking a plurality of thin steel plates 14 punched from the steel plate forming the stator 2 in the axial direction. The spacer 12 is formed in a regular octagonal column shape, and has eight outer surfaces 12b.

Each outer surface 12b of the spacer 12 has
A magnet 13 having a rectangular cross section (hereinafter, referred to as an axial rectangle) viewed from the axial direction of the rotor 10 is fixed by an adhesive or the like. The magnet 13 is magnetized in its thickness direction. If the inner surface is N-pole, the outer surface is S-pole. In the text and drawings, only the magnetic poles on the inner surface are described. The magnets 13 are arranged so as to have different magnetic poles alternately in the rotation direction. At this time, in FIG.
The angle between the center of gravity of each magnet 13 and each adjacent central axis L passing through the center O of the rotating shaft 11 is “45 °”, and each central axis L is perpendicular to each outer surface 12b. ing. The magnet 13 is formed by cutting out a predetermined thickness from a rectangular (or cubic) magnet block material having a predetermined size.

The magnet 13 is molded with a resin molding material 15 in order to prevent the magnet 13 from falling off the spacer 12 due to centrifugal force or vibration during rotation. The resin molding material 15 is used not only for molding the magnet 13 but also for molding such that the entire spacer 12 including both ends in the axial direction of the spacer 12 has a columnar shape.

In the vicinity of the through hole 12a of each steel plate 14, eight caulked portions 16 are formed at equal angular intervals so as to be located on the respective central axis lines L. The caulking portion 16 is formed by making two parallel cuts in each steel plate and protruding in a V-shape as disclosed in, for example, JP-A-6-78482. The steel plates are stacked in a state where the caulking portions 16 are engaged with each other, pressure is applied in the axial direction, and the steel plates are caulked and fixed. Note that, for simplicity, the swaged portion 16 is indicated by a circle in the drawing.

Next, the operation of the motor 1 configured as described above will be described. In the spacer 12, a magnetic path is formed between different poles of the magnet 13. In particular, as shown by a two-dot chain line with an arrow in FIG. 2, stronger magnetism flows from the N pole of the magnet 13 to the S pole of the adjacent magnet 13 on the outer periphery of the spacer 12. The caulking unit 16
Since it is formed in the vicinity of the through hole 12a of the spacer 12, this magnetic path is not obstructed. Further, the caulked portion 16 is formed on the central axis L, and the magnetic flux density is small on each central axis L, so that the magnetic path is not obstructed.

As described in detail above, according to this embodiment, the following effects can be obtained. (1) Since the caulked portion 16 is formed on the central axis L of the steel plate 14 where the magnetic flux density is low, the magnetic resistance does not increase and the rotation efficiency of the rotor 10 does not decrease.

(2) Since the caulking portion 16 is formed near the through hole 12a of the spacer 12 with a small magnetic path between the magnets, the magnetic resistance does not increase and the rotational efficiency of the rotor 10 does not decrease.

(3) Since the steel plates 14 are connected by caulking the caulking portions 16, the rotor 10 can be manufactured at lower cost than when the steel plates are connected by, for example, an adhesive.

(4) Since the steel plate 14 is formed using the remaining inner portion formed by stamping out the stator 2, it is not necessary to form the steel plate 14 from another material, and the material cost can be reduced.

(5) Since the spacer 12 is a regular octagonal prism and the magnet 13 is an oblong rectangle, for example, the spacer 12 has an arc-shaped cross section, and the magnet 12 also has an arc-shaped cross section.
The magnetic path is widened by the amount corresponding to each vertex, and magnetism does not easily leak.

(6) Since the magnet 13 of this embodiment is a rectangular parallelepiped, it can be easily formed as compared with a generally used arc-shaped magnet. That is, the magnet 13 of the present embodiment simply cuts out a predetermined thickness from a rectangular (or cubic) magnet block material having a predetermined size. On the other hand, the arc-shaped magnet is formed by cutting out a rectangular parallelepiped magnet material having a predetermined thickness from a rectangular (or cubic) magnet block material having a predetermined size, and further polishing the material to form an arc. . Therefore, the magnet 13 of the present embodiment has a smaller size than the arc-shaped magnet.
The manufacturing process is simple, and the number of steps required for manufacturing is small. Moreover, in the magnet 13 of the present embodiment, more magnets 13 can be formed from the block material per unit than the arc-shaped magnet. As a result, the magnet 13 can be manufactured at low cost, and the cost of the motor 1 can be reduced.

(7) The magnet 13 of the present embodiment is fixed to the outer surface 12b of the spacer 12 by planes. Here, if an arc-shaped magnet is used, when the magnet is fixed to the outer peripheral surface of the columnar spacer, the curvature of the outer peripheral surface of the spacer may not match the inner surface of the magnet. In such a case, the jig is pressed against the outer surface of the magnet, and the magnet is fixed to the spacer such that the inner surface of the magnet is in close contact with the outer surface of the spacer. May be cracked or displaced. Therefore, it is necessary to match the curvature of the inner surface of the magnet with that of the outer surface of the spacer as much as possible.
This requires high-precision polishing, so that not only is it troublesome, but also the cost increases. Therefore, in the present embodiment, since the planes are mutually flat, the magnet 13 can be easily and reliably fixed to the spacer 12 without causing various problems when using the arc-shaped magnet, and The rotor 10 can be manufactured at a low cost.

(8) The magnet 1 is formed by the resin molding material 15.
The entire spacer 12 including both ends 3 and the axial direction of the spacer 12 is molded in a columnar shape. Therefore, it is possible to prevent the magnet 13 from dropping from the spacer 12 due to centrifugal force, vibration, or the like during rotation. Also, motor 1
Can be easily assembled. In addition, the resin molding material 15 can have a thicker portion in the central portion in the rotation direction of the magnet 13 than in a case where an arc-shaped magnet is used, so that the magnet 13 can be held with high holding strength. . Therefore, the thickness of the resin molding material 15 can be reduced as a whole, and the gap between the magnet 13 and the stator 2 can be reduced. As a result, the leakage magnetic flux can be minimized and the output of the motor 1 can be increased.

(9) The base end of the tooth 4a is mutually connected to the adjacent one, and the connection forms the annular portion 4b. Therefore, a change in the magnetic field between the teeth 4a is reduced, which can contribute to a reduction in cogging torque.

(Second Embodiment) Next, a second embodiment will be described with reference to FIGS. This embodiment is based on the first
The difference is that the configuration of the spacer 12 of the embodiment is changed, a through hole for positioning is formed, and the caulking portion 16 is not formed. The same parts as those in the above embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

The spacer 12 has a first block 17 between the axial center and one end, and a second block 18 between the axial center and the other end. The first and second blocks 17 and 18 are both formed in a regular octagonal prism shape,
In the center of each, a through hole 1 through which the rotating shaft 11 is inserted
7a, 18a are provided, and eight outer surfaces 17 are provided.
b, 18b.

Here, in FIG.
The angles formed by the adjacent center axis lines La and the center axis lines Lb, which are perpendicular to 7b and 18b and pass through the center O of the rotating shaft 11, are each "45 °". Each of the blocks 17 and 18 is provided so as to be relatively displaced in the rotational direction by “22.5 °”, which is a half thereof.

Each outer surface 17b, 18 of the spacer 12
At b, the magnets 13a and 13b each having an oblong rectangle are fixed with an adhesive or the like so that the magnetic poles alternately have different magnetic poles in the rotation direction.

Thus, as shown in FIGS. 4 to 6, each magnet 13a, 13b is axially
18, the magnet 13a fixed to the first block 17 and the magnet 13b fixed to the second block 18 have the same pole relatively shifted by 22.5 ° in the rotational direction. Be placed. At this time, each magnet 13a, 13b
The center of gravity is arranged so as to pass through the central axis lines La and Lb. Accordingly, the central axis lines La and Lb passing through the centers of gravity of the magnets 13a and 13b are arranged so that each block 1
7 and 18 are alternately arranged at equal intervals of “22.5 °”. Then, the magnets 13a and 13b are
5 is molded.

Each of the blocks 17 and 18 has a through hole 17.
Facing a and 18a, four through holes 19 and 20 are formed on the same circumference in the axial direction at equal angular intervals (“90 °”). The through hole 19 is provided on the center axis La of the first block 17. Since the through-hole 20 is disposed at a position shifted by “22.5 °” with respect to the center axis Lb on the counterclockwise side (hereinafter referred to as “axial counterclockwise side”) when viewed from one side in the axial direction, It is positioned on a straight line connecting the vertex of the regular octagonal prism of the second block 18 and the center O of the rotating shaft 11.

Next, the assembly of the first and second blocks 17, 18 and the rotating shaft 11 will be described with reference to FIG. As shown in FIG. 7, the jig 21 for positioning the blocks 17 and 18 has four rod-shaped arms 21a.

First, the first and second blocks 17, 18 formed by stacking the steel plates 14 are inserted into the through holes 17a, 18a.
Is disposed at a position facing the rotation shaft 11, and “2” is set in the rotation direction.
The through-hole 19 and the through-hole 20 are opposed to each other by shifting by 2.5 °. Next, each arm 21a of the jig 21 is inserted into each through hole 1
The first and second blocks 1 and 2 are inserted through and fitted in the axial direction.
Pressing the first and second blocks 17 and 18 against the rotating shaft 11 while keeping the deviation between 7 and 18 at “22.5 °”
The rotating shaft 11 is fitted and fixed in each of the through holes 17a, 18a. After fixing, the arm portion 21a is pulled out from each of the through holes 19 and 20.

According to this embodiment, the following effects are obtained in addition to the effects (3) to (9) of the first embodiment.
(10) Since the through holes 19 and 20 are formed facing the through holes 17a and 18a of the blocks 17 and 18 with a small magnetic path between the magnets, the magnetic resistance does not increase and the rotation of the rotor 10 is increased. Efficiency does not decrease.

(11) First and second blocks 17 and 18
Is easily shifted by a predetermined angle by passing the arm portion 21a of the jig 21 through the through holes 19 and 20. (12) The through-hole 19 is the center axis La of the first block 17.
The through hole 20 is formed on the center axis Lb with respect to the center axis Lb.
The magnet 13 a of the first block 17 and the second block 18
The same polarity of the magnet 13b is relatively “22.5
° ”offset and secure and easy positioning.

(13) Each of the magnets 13a, 13b is divided axially into two first and second blocks 17, 18,
The magnet 13a of the block 17 and the magnet 1 of the second block 18
The same pole of 3b is relatively displaced by “22.5 °” in the rotation direction. By doing so, the cogging torque of the motor 1 can be kept extremely small within the effective range of the deviation angle. In this embodiment, the cogging torque is relatively large because the U, V, and W phase excitation coils are formed for each of the three teeth 4a that are continuous in the rotation direction. However, such cogging torque is relatively large. The effect is great if implemented for a large motor.

Third Embodiment Next, a third embodiment will be described with reference to FIGS. This embodiment is different from the second embodiment in that the arrangement of the through holes 19 and 20 is changed. The same parts as those in the above embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

Each through hole 19 is formed with respect to the center axis La.
When viewed from one side in the axial direction, it is formed so as to be shifted by “11.25 °” toward the clock side (hereinafter referred to as the axial clock side). The through-hole 20 is formed so as to be offset by “11.25 °” counterclockwise with respect to the central axis Lb. Thus, even if the arrangement of the through holes 19 and 20 is changed, the respective through holes 19 and 2 are not changed.
When the arm 21a of the jig 21 is inserted into the jig 21 and positioned, the center axis La and the center axis Lb are displaced from each other by “22.5 °”.
It is fixed to the rotation shaft 11 by being shifted in the direction of rotation by “2.5 °”.

According to this embodiment, the following effects can be obtained in addition to the effects (3) to (13) of the above embodiments. (14) Each through hole 19 is positioned at “1” with respect to the center axis La.
1.25 ° ”is formed so as to be shifted clockwise with respect to the axis, and the through hole 20 is formed.
Is formed with a shift of “11.25 °” counterclockwise with respect to the center axis Lb, so that the magnetism is balanced, the cogging torque of the rotor 10 is further reduced, and the rotational efficiency is further improved. I do.

(Fourth Embodiment) Next, a fourth embodiment will be described with reference to FIGS. This embodiment is
The third embodiment is different from the third embodiment in that a caulking portion is provided. The same parts as those in the above embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

The first and second blocks 17 and 18 are formed with swaging portions 22 and 23, respectively. Caulking part 22
On the side of the through hole 17 a of the first block 17, four are formed for each steel plate 14 on a straight line connecting the center O of the rotating shaft and the through hole 19. Four caulking portions 23 are formed for each steel plate 14 on the straight line connecting the center O of the rotating shaft and the through hole 20 on the side of the through hole 18 a of the second block 18. Therefore, the through holes 19 of the first block 17
The caulking portion 22 is positioned at “11.
The second block 1 is formed so as to be shifted clockwise by 25 °.
The through hole 20 and the caulked portion 23 of 8 are formed so as to be displaced counterclockwise by “11.25 °” from the center axis Lb.

According to this embodiment, the following effects are obtained in addition to the effects (2) to (14) of each of the above embodiments. (15) The caulking portion 22 is positioned at “1” with respect to the center axis La.
1.25 ° ”is formed to be shifted toward the clockwise side of the shaft,
3 is formed so as to be shifted counterclockwise by “11.25 °” with respect to the center axis Lb, so that the magnetism is balanced, the cogging torque of the rotor 10 is reduced, and the rotation efficiency is improved. .

Note that the embodiment is not limited to the above-described embodiment, and may be modified as follows, for example. -As another example of the first embodiment, in the rotor 10,
Rotate magnets of the same polarity in the direction of rotation (where k is an integer of 2 or more)
It may be divided. As an example, when k = 2, the spacer is provided with 16 magnets each of which is divided into two 8-pole magnets. In this case, as shown in FIG. 3, on the outer surface 12b of the regular hexagonal column, 16 magnets 13 each having eight poles 13 divided into two are provided.

In this manner, the average gap between the outer surface of the magnet 13 and the inner peripheral surface of the annular portion 4b of the stator 2 is further reduced. Therefore, the leakage magnetic flux can be minimized, and the output of the motor 1 can be increased. Note that the same may be applied to the second to fourth embodiments.

In the first embodiment, the caulking section 16
Is not limited to eight if formed on the central axis L,
It may be one or a plurality at equal angular intervals. In the first embodiment, the caulked portion 16 may be formed not only on the center axis L but also near the center axis L as long as the location has a low magnetic flux density.

In the second embodiment, the through hole 19 is formed on the center axis La, and the through hole 20 is formed on the center axis Lb.
On the other hand, the through hole 19 is not necessarily formed so as to be shifted in the counterclockwise direction by “22.5 °”. The through-hole 20 may be formed on the central axis Lb.

In the second embodiment, the through holes 19,
The number 20 is not limited to four, and may be one or a plurality at equal angular intervals. In the third embodiment, each through-hole 19 is formed so as to be shifted clockwise by “11.25 °” with respect to the central axis La, and the through-hole 20 is formed with respect to the central axis Lb. 1
The angle is not limited to “1.25 °” and is shifted to the counterclockwise direction. For example, each through-hole 19 is formed so as to be offset by “11.25 °” counterclockwise with respect to the center axis La, and the through-hole 20 is formed with “11.2 °” with respect to the center axis Lb.
5 ° "may be formed so as to be shifted clockwise.

In the fourth embodiment, for example, the caulked portion 22 is set at “11.25 °” with respect to the center axis La.
The caulking portion 23 may be formed so as to be shifted to the counterclockwise direction in the axial direction and to be shifted to the clockwise direction by “11.25 °” with respect to the center axis Lb.

In the fourth embodiment, for example, the through-hole 19 and the caulked portion 22 are positioned with respect to the central axis La.
The “11.25 °” axis is formed to be displaced counterclockwise, and the second
The through-hole 20 and the caulked portion 23 of the block 18 may be formed so as to be offset by “11.25 °” clockwise with respect to the center axis Lb.

In the fourth embodiment, the caulking section 2
The numbers 2 and 23 are not limited to four, and may be one or a plurality at equal angular intervals. -Each through-hole 19, 20 is not limited to the structure formed facing the through-holes 17a, 18a, but may be formed near the through-holes 17a, 18a. Even in this case, each through hole 19,
Since 20 is formed in a place where the magnetic path between the magnets 13a and 13b is small, the magnetic resistance does not increase and the rotational efficiency of the rotor 10 does not decrease.

The spacer 12 is not limited to be formed from the remaining portion punched from the stator 2, but may be formed from another material. -The magnet is not limited to an axial rectangle, for example, an axial square,
It is sufficient if it is an axial quadrangle such as an axle trapezoid or an axle parallelogram.

Although the magnets 13, 13a, 13b are cut out of the magnet block and manufactured, the magnets may be manufactured by compressing and forming powder. The magnets 13, 13a, 13b are molded with the resin molding material 15, but if the magnets 13, 13a, 13b are firmly fixed to the spacer 12, there is no particular need for molding.

The spacer 12 and the magnet 13 may be divided into three or more in the axial direction, and may be arranged at a predetermined angle. Even in this case, the cogging torque can be reduced. The thin plate constituting the spacer 12 may be made of a magnetic material (made of a ferromagnetic material).

The through holes 19 and 20 and the jig 21 may be used for positioning each steel plate 14 at the time of lamination. -The number of the arms 21a of the jig 21 is not limited to four, but one or
A plurality of through holes 19 and 20 may be used.

Although the present invention is applied to a so-called inner rotor type rotating field type motor in which the rotor rotates inside the stator, the present invention may be applied to a so-called outer rotor type rotating field type motor in which the rotor rotates outside the stator.

[0063]

As described in detail above, according to the first to eighth aspects of the present invention, the rotor can be manufactured at low cost, and according to the ninth aspect of the present invention, the motor can be manufactured at low cost. It can be manufactured by

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a motor according to a first embodiment.

FIG. 2 is a schematic plan view of a rotor.

FIG. 3 is a schematic plan view of a main part of another example of a rotor.

FIG. 4 is a schematic perspective view illustrating a configuration of a rotor according to a second embodiment.

FIG. 5 is a schematic plan view of a first block of the rotor.

FIG. 6 is a schematic plan view of a second block of the rotor.

FIG. 7 is a schematic exploded perspective view showing a positional relationship between a first block and a second block.

FIG. 8 is a schematic plan view of a first block of a rotor according to a third embodiment.

FIG. 9 is a schematic plan view of a second block of the rotor.

FIG. 10 is a schematic perspective view illustrating a configuration of a rotor according to a fourth embodiment.

FIG. 11 is a schematic plan view of a first block of the rotor.

FIG. 12 is a schematic plan view of a second block of the rotor.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Motor as an electric motor, 2 ... Stator, 10 ... Rotor, 11 ... Rotating shaft, 12 ... Spacer, 12b, 17b,
18b ... outer surface, 13, 13a, 13b ... magnet, 14 ...
Steel plates as thin plates, 16, 22, 23 ... caulked part, 1
7, 18: Blocks as spacer portions divided in the axial direction, 19, 20: Through holes, 21: Jigs, L, L
a, Lb: center axis, O: center of rotation axis.

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H02K 21/16 H02K 21/16 M (72) Inventor Takanori Ozawa 390 Umeda, Kosai City, Shizuoka Prefecture Asmo Co., Ltd. (72) Inventor Mitsuhiko Matsushita 390 Umeda, Kosai-shi, Shizuoka Prefecture Asmo Co., Ltd.F-term (reference)

Claims (9)

[Claims] 1. A rotor comprising a rotating shaft, a spacer rotating integrally with the rotating shaft, and a plurality of magnets fixed to an outer surface of the spacer, wherein the spacer is formed by laminating thin plates made of a magnetic material. Thereby, the magnet is formed in a polygonal column shape having a plurality of outer surfaces, and the magnet fixed to the outer surface is formed in a rectangular shape as viewed from the axial direction of the rotor. Wherein the caulking portion is provided at a location where the magnetic flux density between the magnets adjacent to each other in the rotation direction of the rotor is low. 2. The rotor structure according to claim 1, wherein the caulking portion is disposed near the rotation axis. 3. A rotor comprising a rotating shaft, a spacer rotating integrally with the rotating shaft, and a plurality of magnets fixed to an outer surface of the spacer, wherein the spacer is formed by laminating thin plates made of a magnetic material. Thereby, the magnet formed in a polygonal column shape having a plurality of outer surfaces, the magnet fixed to the outer surface is formed in a square shape when viewed from the axial direction of the rotor, and the spacer and the magnet are n in the axial direction.
(Where n is an integer of 2 or more), and the divided portions are arranged at predetermined angles in the same rotation direction between adjacent portions in the axial direction, and the thin plate is fixed by a jig. A structure of a rotor, characterized in that through holes that can be positioned are disposed at the predetermined angle. 4. Each of the magnets provided in each of the divided portions is formed symmetrically with respect to a plane including the center of gravity and the center of the rotation axis, and formed in different portions divided in the axial direction. 4. The rotor structure according to claim 3, wherein the through holes are arranged at equal distances on different rotation directions with respect to the plane, and are arranged near the rotation axis. 5. 5. The thin plate is provided with a caulking portion for connecting the respective thin plates, and the caulking portion is disposed at a position where the magnetic flux density between the magnets adjacent in the rotation direction of the rotor is small. The structure of the rotor according to claim 3 or 4. 6. Each of the magnets provided in each of the divided portions is formed symmetrically with respect to a plane including the center of gravity and the center of a rotation axis, and is formed in the different portion divided in the axial direction. The rotor structure according to claim 5, wherein the caulking portions are arranged at equal distances on different rotation directions with respect to the plane, and are arranged near the rotation axis. 7. A rotor comprising a rotating shaft, a spacer rotating integrally with the rotating shaft, and a plurality of magnets fixed to an outer surface of the spacer, wherein the spacer is arranged on an outer periphery of the rotor. A thin plate made of a magnetic material obtained by stamping and forming a stator is formed into a polygonal column shape having a plurality of outer surfaces by laminating thin plates formed of the material of the inner portion of the stator, and fixed to the outer surface. The structure of the rotor, wherein the magnet is formed in a rectangular shape when viewed from the axial direction of the rotor. 8. The magnet is divided into m (where m is an integer of 1 or more) in a rotational direction, and the spacer is formed by a product (P) of the number m of divisions and the number P of magnetic poles of the magnet.
The rotor structure according to any one of claims 1 to 7, wherein the rotor is formed in a polygonal prism shape having the same number of outer surfaces as xm, where (Pxm is an even number of 8 or more). 9. An electric motor having the rotor according to claim 1. Description: