JP4966992B2 - Rotor and method for manufacturing rotor - Google Patents

Description

  The present invention relates to a rotor and a method for manufacturing the rotor.

  2. Description of the Related Art Conventionally, a motor including a stator around which a coil is wound, a rotor disposed inside the stator, and a shaft that is press-fitted and fixed coaxially with the rotor and rotatably supported is known. The rotor of the motor described above includes a rotor core in which a plurality of magnetic plate members are stacked, and a permanent magnet accommodated in an accommodation hole formed along the axial direction from the end surface of the rotor core. And when an electric current flows into the coil wound by the stator, attraction or a repulsive force arises between the permanent magnet of a rotor and a stator, and a rotor rotates.

  By the way, in the motor described above, a transmission means such as a gear is provided at the tip of the shaft, the power obtained by the rotation of the rotor is transmitted to an external device, or an output means such as a fan is provided at the tip of the shaft. Is directly output to the outside.

However, when power is transmitted using a helical gear such as a helical gear, power is smoothly transmitted to an external device, while a thrust force acts along the axial direction of the shaft. This thrust force acts toward the bearing that supports the shaft, so that the bearing is pressed against the wall surface of the motor housing. Specifically, since the inner ring of the bearing moves in the axial direction together with the shaft, the inner ring and the outer ring of the bearing may be displaced in the axial direction, which may reduce the rotational performance of the bearing. In contrast, by increasing the bearing in the axial direction, axial displacement between the inner ring and the outer ring due to the thrust force acting on the bearing is allowed, or by increasing the radial direction, contact between the motor housing and the bearing is increased. A configuration that improves the area and absorbs the thrust force is also conceivable. However, there is a problem that increasing the size of the bearing in the axial direction and the radial direction leads to an increase in size of the motor.
Thus, a rotor having a rotor core skewed is known in order to reduce the thrust force generated along the axial direction of the shaft (see, for example, Patent Document 1).

Japanese Patent Laid-Open No. 58-116033

By the way, in patent document 1 mentioned above, when a flat steel plate is laminated | stacked and a rotor core is comprised, and also a rotor core is made to skew, the die side by which the flat steel plate is distribute | arranged in the flat steel plate lamination process is desired with a motor etc. It is manufactured by rotating at an angle and stacking.
However, the conventional manufacturing process requires a mechanism for rotating the die and the like, and there are problems that the manufacturing process is complicated and the manufacturing cost is high.

  Accordingly, the present invention has been made in view of the above circumstances, and provides a rotor and a method of manufacturing the rotor that can obtain a skewed rotor core with a simple configuration.

In order to solve the above-described problem, the invention described in claim 1 includes a cylindrical first rotor core (for example, the first rotor core 70 in the embodiment) and a second rotor core (for example, the second rotor core 80 in the embodiment). And a plurality of permanent magnets (for example, permanent magnets 74 and 84 in the embodiment) disposed at substantially equal intervals in the circumferential direction on the first rotor core and the second rotor core. And a rotor (for example, the embodiment) provided with a rotatable shaft (for example, the shaft 24 in the embodiment) at the axis center (for example, the axis center C in the embodiment) of the first rotor core and the second rotor core In the rotor 22), the first rotor core has a first pin hole (for example, implemented along the axial direction). The first pin hole 78) is formed, and the second rotor core is formed with a second pin hole (for example, the second pin hole 88 in the embodiment) along the axial direction. And the second pin hole have the same radial distance from the axis center, and the angle between the first pin hole and the second pin hole is θ × N + S around the axis. θ = An angle formed by the centers of adjacent permanent magnets around the axis
N = any integer less than or equal to the number of permanent magnets
S is formed at a skew angle between the first rotor core and the second rotor core, and a pin (for example, pin 65 in the embodiment) is inserted through the first pin hole and the second pin hole, The second rotor core is positioned.

  According to a second aspect of the present invention, an angle formed between the first pin hole and the circumferential center of the permanent magnet and an angle formed between the second pin hole and the circumferential center of the permanent magnet with the axis as a center. However, the first pin hole and the second pin hole are respectively positioned at S / 2 with a line segment connecting the axis center and the circumferential center of the permanent magnet (for example, line segment E in the embodiment) as a boundary. It is characterized by being formed.

  According to a third aspect of the present invention, a third pin hole (for example, the third pin hole 79 in the embodiment) is formed at a position that is 180 ° different in the circumferential direction of the first pin hole in the first rotor core. It is a feature.

  According to a fourth aspect of the invention, a fourth pin hole (for example, the fourth pin hole 89 in the embodiment) is formed at a position that is 180 ° different in the circumferential direction of the second pin hole in the second rotor core. It is a feature.

  According to a fifth aspect of the present invention, the first rotor core and the second rotor core are both formed by laminating flat steel plates (for example, the magnetic plate material 44 in the embodiment), and the first rotor core and the second rotor core. Both are configured to be non-rolled, and the first rotor core and the second rotor core are stacked in the axial direction in a state in which the second rotor core is rotated 180 ° with respect to the first rotor core. It is a feature.

  The invention described in claim 6 is characterized in that the first pin hole and the second pin hole are formed in each of the first rotor core and the second rotor core.

The invention described in claim 7 includes a rotor core having a cylindrical first rotor core and a second rotor core, and a plurality of permanent magnets arranged at substantially equal intervals in the circumferential direction on the first rotor core and the second rotor core, Forming a first pin hole along the axial direction in the first rotor core, wherein the first rotor core and the second rotor core are provided with a rotatable shaft at an axial center thereof; The second rotor core has a radial distance from the center of the first pin hole and the shaft center, and an angle formed by the first pin hole with the shaft as a center is θ × N + S where θ = axis The angle formed by the circumferential center of adjacent permanent magnets around
N = any integer less than or equal to the number of permanent magnets
S = a step of forming a second pin hole so as to have a skew angle between the first rotor core and the second rotor core, and the first pin hole of the first rotor core is longer than the axial length of the first rotor core. A step of inserting a pin, a step of inserting the pin protruding from the first rotor core into the second pin hole of the second rotor core, and the first yoke and the second with the pin inserted. And a step of inserting the shaft into an opening (for example, the openings 75 and 85 in the embodiment) formed at the shaft center of the yoke.

  According to the first aspect of the present invention, the first rotor core and the second rotor core are shifted by the skew angle S by inserting the pins through the first pin hole of the first rotor core and the second pin hole of the second rotor core. It can be held in the state. Therefore, since the first rotor core and the second rotor core can be skewed by a desired angle simply by forming the first pin hole and the second pin hole, a skewed rotor core can be obtained with a simple configuration.

  According to the second aspect of the present invention, the first pin hole and the second pin hole are formed at the positions of S / 2, respectively, with a line segment connecting the axis center and the circumferential center of the permanent magnet as a boundary. The weight balance between the rotor core and the second rotor core can be made substantially uniform. Therefore, the rotor can be rotated with high accuracy around the rotation axis when the rotor rotates.

  According to the third aspect of the present invention, the rotor core can be positioned more accurately by inserting the pins through the two locations of the first pin hole and the third pin hole.

  According to the fourth aspect of the present invention, the rotor core can be positioned more accurately by inserting the pins through the two locations of the second pin hole and the fourth pin hole.

  According to the fifth aspect of the present invention, when the flat steel plates are laminated without rolling, the crossing of the thickness of the flat steel plates concentrates on one side, so that the axial thickness of the rotor core varies, but the first rotor core On the other hand, the thickness of the rotor core in the axial direction can be made substantially uniform by rotating and stacking the second rotor core by 180 °. Therefore, the axial end surface of the rotor core can be substantially parallel to the surface orthogonal to the rotation axis, and the end face plate can be securely attached to the axial end surface of the rotor core.

  According to the invention described in claim 6, since the first rotor core and the second rotor core can be manufactured in the same process, the production efficiency can be improved.

  According to the seventh aspect of the present invention, the first rotor core and the second rotor core are shifted by the skew angle S by inserting the pins through the first pin hole of the first rotor core and the second pin hole of the second rotor core. It can be held in the state. Therefore, since the first rotor core and the second rotor core can be skewed by a desired angle simply by forming the first pin hole and the second pin hole, a skewed rotor core can be obtained with a simple configuration.

It is a schematic longitudinal cross-sectional view of the vehicle motor unit in the embodiment of the present invention. It is a front view of the rotor in the embodiment of the present invention. It is sectional drawing which follows the AA line of FIG. It is a front view of the 1st rotor core in the embodiment of the present invention. It is a front view of the 2nd rotor core in the embodiment of the present invention. It is explanatory drawing (1) which shows the manufacturing method of the rotor in embodiment of this invention. It is explanatory drawing (2) which shows the manufacturing method of the rotor in embodiment of this invention. It is explanatory drawing (3) which shows the manufacturing method of the rotor in embodiment of this invention. It is explanatory drawing which shows another aspect in the manufacturing process of the rotor in embodiment of this invention.

  Next, an embodiment of the present invention will be described with reference to FIGS. In the present embodiment, a motor employed in the vehicle drive motor unit will be described.

  FIG. 1 is a schematic sectional view of a vehicle drive motor unit. As shown in FIG. 1, a vehicle drive motor unit (hereinafter referred to as a motor unit) 10 includes a motor housing 11 that houses a motor 23 that includes a stator 21 and a rotor 22, and one side in the axial direction of the motor housing 11. Fastened and fastened to the transmission housing 12 (not shown) for transmitting power from the shaft 24 of the motor 23 and the other side in the axial direction of the motor housing 11 and accommodates the rotation sensor 25 of the motor 23. And a sensor housing 13. The mission housing 12 includes a common housing 12A fastened to the motor housing 11 and a gear housing 12B fastened to the common housing 12A. The motor housing 11 is configured as a motor chamber 36, the mission housing 12 is configured as a mission chamber 37, and the sensor housing 13 is configured as a sensor chamber 38.

  The motor housing 11 is formed in a substantially cylindrical shape so as to cover the entire motor 23. The shared housing 12 </ b> A constitutes a boundary between the motor housing 11 and the mission housing 12, and a partition wall 41 that partitions the motor chamber 36 and the mission chamber 37 is formed between the motor housing 11 and the mission housing 12. Yes. A through hole 40 penetrating in the thickness direction of the partition wall 41 is formed at a substantially central portion in front view as viewed from the axial direction of the partition wall 41. A bearing 26 that rotatably supports one end of the shaft 24 of the motor 23 is disposed in the through hole 40. A helical gear (an inclined gear) 28 that meshes with the power transmission unit in the mission housing 12 is fixed to one end of the shaft 24.

  A boss portion 50 that protrudes toward one end side in the axial direction is formed at a substantially central portion in front view as viewed from the axial direction of the sensor housing 13. A through hole 51 that penetrates in the axial direction and communicates with the sensor chamber 38 and the motor chamber 36 is formed in a substantially central portion of the boss portion 50, and the shaft 24 passes into the sensor chamber 38 through the through hole 51. The other end side is arranged. The rotation angle of the motor 23 can be detected by detecting the rotation angle of the shaft 24 by the rotation sensor 25 of the sensor chamber 38. On the other end side (sensor chamber 38 side) of the inner peripheral surface of the through hole 51, an inner flange portion 52 is formed that projects radially inward from the inner peripheral surface of the through hole 51. A bearing housing 53 surrounded by the inner peripheral surface of the through hole 51 and the end surface of the inner flange portion 52 is formed on one end side of the through hole 51. A bearing 27 that rotatably supports the other end of the shaft 24 of the motor 23 is disposed in the bearing housing 53. In this case, the forward rotation direction of the shaft 24 is clockwise when viewed from one end side of the shaft 24 to the other end side (see arrow B in FIGS. 1 and 2).

  Note that cooling oil (not shown) for cooling the bearings 26 and 27, the motor 23, and the like is introduced into the motor unit 10 (the motor housing 11, the transmission housing 12, and the sensor housing 13). 23 is arranged in a state in which a part of the stator 21 is immersed in the cooling oil. In addition, an oil pump (not shown) is provided in the mission housing 12 so that the cooling oil pumped up by the oil pump can circulate in the motor unit 10 through an oil passage (not shown). . The cooling oil circulating in the motor unit 10 is supplied to the bearings 26, 27, etc., so that the bearings 26, 27, etc. are cooled.

  Further, a breather passage 35 communicating with each other is formed in the wall 31 of the motor housing 11, the wall 32 of the transmission housing 12, and the wall 33 of the sensor housing 13, respectively. Hot air can be discharged.

  Further, a water jacket 55 for cooling the motor 23 is provided in the wall portion 31 of the motor housing 11 so as to cover the entire circumference of the stator 21 in the motor 23. The stator 21 is shrink-fitted into the motor housing 11 and is disposed so as to be in close contact with the inner peripheral surface of the motor housing 11.

  Next, the configuration of the motor 23 will be described. The motor 23 of the present embodiment is an inner rotor type motor, and is a cylindrical stator 21, a columnar rotor 22 disposed inside the stator 21, and press-fitted and fixed coaxially with the rotor 22 so as to be rotatable. And a shaft 24 supported by the motor.

  The stator 21 is formed by stacking magnetic plate members 44 in the axial direction, and includes teeth (not shown) extending inward in the radial direction. A coil 43 is wound around this tooth via an insulator (not shown).

2 is a front view of the rotor, and FIG. 3 is a cross-sectional view taken along line AA of FIG. FIG. 4 is a front view of the first rotor core, and FIG. 5 is a front view of the second rotor core.
As shown in FIGS. 2 and 3, the rotor 22 is a substantially ring-shaped member when viewed from the axial direction arranged at a predetermined interval inside the above-described stator 21, and a magnetic plate material 44 is laminated thereon. The rotor core 61 is provided. The rotor core 61 is divided in the axial direction into a first rotor core 70 and a second rotor core 80. In addition, accommodation holes 73 are formed in the circumferential portion of the first rotor core 70 at substantially equal intervals in the circumferential direction, permanent magnets 74 are disposed in the accommodation holes 73, and a circumferential portion of the second rotor core 80 is circumferential. Housing holes 83 are formed at approximately equal intervals in the direction, and permanent magnets 84 are disposed in the housing holes 83.

  Furthermore, openings 75 and 85 are respectively formed in substantially central portions in front view of the first rotor core 70 and the second rotor core 80, and the shaft 24 is press-fitted and fixed to the openings 75 and 85.

  First, as shown in FIG. 4, one first rotor core 70 is obtained by laminating magnetic plate members 44 along the axial direction of the shaft 24, and the axial direction of the first rotor core 70 is at the radial center. An opening 75 is formed so as to penetrate therethrough. A plurality of accommodation holes 73 that penetrates in the axial direction of the first rotor core 70 are formed in the peripheral portion of the first rotor core 70. Further, in the present embodiment, the rib 77 is formed so as to divide the accommodation hole 73 into two in the direction along the radial direction of the first rotor core 70 at the approximate center of the accommodation hole 73 in the front view of the first rotor core 70. Yes. That is, the rib 77 is formed so as to be positioned at the center in the circumferential direction of the permanent magnet 74. The permanent magnet 74 is also divided into two parts by the rib 77.

  The plurality of receiving holes 73 are formed at substantially equal intervals along the circumferential direction in the peripheral portion of the first rotor core 70, and are formed in an arc shape or a rectangular shape in a front view. In each accommodation hole 73, a permanent magnet 74 made of a rare earth such as neodymium is disposed. The permanent magnet 74 is divided into a plurality of parts along the axial direction, and is arranged so that the end faces of the permanent magnet 74 are flush with both end faces 70a and 70b (see FIG. 3) of the first rotor core 70. ing. Thus, by dividing the permanent magnet 74 into a plurality along the axial direction, eddy current loss generated in the permanent magnet 74 can be reduced. The first rotor core 70 is formed with a plurality of lightening holes 76 in order to reduce the weight.

  As shown in FIG. 5, the other second rotor core 80 is provided on the other end side in the axial direction with respect to the first rotor core 70, and the end surface 70 b on the other end side of the first rotor core 70 and the second rotor core 80. They are stacked in contact with the end face 80a on one end side. Similar to the first rotor core 70, the second rotor core 80 is formed by laminating the magnetic plate materials 44 along the axial direction of the shaft 24, and an opening penetrating in the axial direction of the second rotor core 80 in the central portion in the radial direction. A portion 85 is formed. A plurality of receiving holes 83 penetrating in the axial direction of the second rotor core 80 are formed in the peripheral portion of the second rotor core 80 at substantially equal intervals along the circumferential direction.

  In addition, in the front view of the second rotor core 80, a rib 87 is formed so as to divide the accommodation hole 83 into two in the direction along the radial direction of the second rotor core 80 at the approximate center of the accommodation hole 83. That is, the rib 87 is formed so as to be positioned at the circumferential center of the permanent magnet 84. The permanent magnet 84 is also divided into two parts by the rib 87. In each accommodation hole 83, a permanent magnet 84 made of a rare earth such as neodymium is disposed. The permanent magnet 84 is divided into a plurality of parts along the axial direction, and the end surface of the permanent magnet 84 is arranged so as to be flush with the both end surfaces 80 a and 80 b of the second rotor core 80. The second rotor core 80 is formed with a plurality of lightening holes 86 in order to reduce the weight.

  Returning to FIG. 3, a pair of end face plates 90 sandwiching the rotor yoke 61 are press-fitted and fixed to both axial end faces of the rotor yoke 61 (one end face 70 a of the first rotor core 70 and the other end face 80 b of the second rotor core 80). ing. The end face plate 90 is a disk-shaped member having an outer diameter equivalent to the outer diameter of the rotor yoke 61, and a press-fitting hole 91 penetrating in the thickness direction of the end face plate 90 is formed in the center portion in the radial direction. Yes. One end face plate 90 is in contact with one end face 70 a of the first rotor core 70, that is, one end face 70 a of the rotor yoke 61, while the other end face plate 90 is on the other end side of the second rotor core 80. The end surface 80b is in contact with the end surface 80b on the other end side of the rotor yoke 61.

  The pair of end face plates 90 prevent the permanent magnets 74 and 84 held in the receiving holes 73 and 83 of the divided yokes 70 and 80 from coming out of the receiving holes 73 and 83 and scattering. It is provided so as to cover the accommodation holes 73 and 83 of the yokes 70 and 80. Thereby, the end surfaces of the permanent magnets 74 and 84 and the end surfaces 70a and 80b of the first rotor core 70 and the second rotor core 80 are held flush with each other.

  Here, as shown in FIG. 4, the first rotor core 70 is formed with a first pin hole 78 and a third pin hole 79 that are substantially circular in a front view along the axial direction. The first pin hole 78 and the third pin hole 79 have the same distance from the axis center C, and are formed at positions that differ by 180 ° in the circumferential direction. Further, the first pin hole 78 and the third pin hole 79 are formed in a region radially outward from the hollow hole 76 and radially inward from the accommodation hole 73. Further, the first pin hole 78 is formed at a position shifted by S / 2 in the clockwise circumferential direction when viewed from the front with respect to the line segment E connecting the shaft center C and the rib 77 closest to the first pin hole 78. ing. Note that S is a skew angle between the first rotor core 70 and the second rotor core 80. Accordingly, the third pin hole 79 is also formed at a position shifted by S / 2 in the circumferential direction with respect to the line segment E connecting the axial center C and the rib 77 closest to the third pin hole 79.

  As shown in FIG. 5, the second rotor core 80 is formed with a second pin hole 88 and a fourth pin hole 89 that are substantially circular in a front view along the axial direction. The second pin hole 88 and the fourth pin hole 89 have the same distance from the axial center C, and are formed at positions that differ by 180 ° in the circumferential direction. Further, the second pin hole 88 and the fourth pin hole 89 are formed in a region radially outward from the hollow hole 86 and radially inward from the accommodation hole 83. Further, the second pin hole 88 is formed at a position shifted by S / 2 in the counterclockwise circumferential direction when viewed from the front with respect to the line segment E connecting the axial center C and the rib 87 closest to the second pin hole 88. Has been. Therefore, the fourth pin hole 89 is also formed at a position shifted by S / 2 in the circumferential direction with respect to the line segment E connecting the axial center C and the rib 87 closest to the fourth pin hole 89. The second pin hole 88 and the fourth pin hole 89 are formed in substantially the same shape as the first pin hole 78 and the third pin hole 79.

  The first pin hole 78 and the second pin hole 88 have the same radial distance from the axial center C, and the first pin hole 78 and the second pin hole 88 are centered on the axial center (rotating axis) C. It is only necessary that the angle formed by is formed at a position of θ × N + S. However, θ is an angle formed by the circumferential centers (ribs 77, 77 (87, 87)) of the adjacent permanent magnets 74, 74 (84, 84) around the axis center C, and N is the permanent magnet 74 (84). ) Is an arbitrary integer (an integer of 8 or less in this embodiment), and S is a skew angle between the first rotor core 70 and the second rotor core 80.

  In the present embodiment, the first rotor core 70 is formed with a first pin hole 78 and a third pin hole 79, and the second rotor core 80 is formed with a second pin hole 88 and a fourth pin hole 89. However, the first to fourth pin holes 78, 79, 88, 89 may be formed in both rotor cores 70, 80. If it does in this way, the magnetic plate material 44 which comprises the 1st rotor core 70, and the magnetic plate material 44 which comprises the 2nd rotor core 80 can use the same thing. Therefore, since the magnetic plate material 44 can be manufactured in the same process, the production efficiency of the rotor cores 70 and 80 can be improved.

Next, a method for manufacturing the rotor 22 will be described.
First, the first rotor core 70 is formed by laminating the magnetic plate material 44 in which the first pin hole 78 and the third pin hole 79 are formed. A permanent magnet 74 is disposed in the accommodation hole 73 of the first rotor core 70.

  At substantially the same time, the second rotor core 80 is formed by laminating the magnetic plate material 44 in which the second pin hole 88 and the fourth pin hole 89 are formed. A permanent magnet 84 is disposed in the accommodation hole 83 of the second rotor core 80.

  Subsequently, as shown in FIG. 6, the pins 65 are respectively inserted into the first pin holes 78 and the third pin holes 79 of the first rotor core 70. Note that the pin 65 is a rod-shaped member formed of, for example, a nonmagnetic material, and the length of the pin 65 is longer than the thickness of the first rotor core 70. Further, the pin 65 can be loosely inserted into the first pin hole 78 and the third pin hole 79. That is, the diameter of the pin 65 is smaller than the diameters of the first pin hole 78 and the third pin hole 79.

  Subsequently, as shown in FIG. 7, the second rotor core 80 is brought into contact with the first rotor core 70 to which the pin 65 is attached. Specifically, the other end surface 70b of the first rotor core 70 and the one end surface 80a of the second rotor core 80 are brought into contact with each other. At this time, the second pin hole 88 and the fourth pin hole 89 of the second rotor core 80 are brought into contact with the pin 65 protruding from the other end surface 70 b of the first rotor core 70. By doing in this way, the 1st rotor core 70 and the 2nd rotor core 80 will contact | abut with the skew angle S. FIG.

  Subsequently, as shown in FIG. 8, the first rotor core 70 and the second rotor core 80 are in contact with each other, and the second rotor core 80 is placed on the stage 67 with the other end surface 80 b facing down. At this time, since the pin 65 is loosely inserted through the first to fourth pin holes 78, 79, 88, 89, the pin 65 moves downward (on the second rotor core 80 side). At this time, end face plates 90 are arranged on the one end face 70 a side of the first rotor core 70 and the other end face 80 b side of the second rotor core 80. In this state, the shaft 24 is inserted through the openings 75 and 85 from above the stage 67 and is press-fitted and fixed.

  And after removing the pin 65 from the 1st rotor core 70 and the 2nd rotor core 80 which were press-fitted and fixed to the shaft 24, it is a magnetic material with respect to the 1st-4th pin holes 78, 79, 88, 89 which are hollow. Is completed, the manufacture of the rotor 22 is completed. When the end face plate 90 and the rotor core 61 are simultaneously press-fitted in this way, a through hole for removing the pin 65 is formed in a position corresponding to the pin hole in at least one of the end face plates 90. . Alternatively, the end face plate 90 may be press-fitted and fixed after only the rotor core 61 is press-fitted and fixed to the shaft 24 and the pin hole is filled with a magnetic material.

  According to the present embodiment, the first rotor core 70 and the second rotor core 80 have a skew angle by inserting the pin 65 through the first pin hole 78 of the first rotor core 70 and the second pin hole 88 of the second rotor core 80. It can be held in a state shifted by S. Therefore, since the first rotor core 70 and the second rotor core 80 can be skewed by a desired angle simply by forming the first pin hole 78 and the second pin hole 88, the skewed rotor core 61 is obtained with a simple configuration. be able to.

  Also, a first pin hole 78 and a second pin hole 88 are formed at positions S / 2, respectively, with a line segment E connecting the axis center C and the circumferential center (ribs 77, 87) of the permanent magnets 74, 84 as a boundary. Therefore, the weight balance between the first rotor core 70 and the second rotor core 80 can be made substantially uniform. Therefore, the rotor 22 can be rotated with high accuracy around the rotation axis C when the rotor 22 rotates.

  Further, the third pin hole 79 is formed in the first rotor core 70, the fourth pin hole 89 is formed in the second rotor core 80, and the pins 65 are inserted through two locations, so that each of the rotor cores 70, 80 can be more accurate. Can be positioned.

The present invention is not limited to the above-described embodiment, and includes various modifications made to the above-described embodiment without departing from the spirit of the present invention. That is, the specific structure and shape described in the embodiment are merely examples, and can be changed as appropriate.
For example, in the present embodiment, the pin hole has a circular shape when viewed from the front. However, the pin hole may have another shape such as a rectangle. In addition, when making a pin hole into a rectangular shape, it is desirable to form so that the shape of a pin hole may correspond, when a 1st rotor core and a 2nd rotor core are made to contact.

  In the present embodiment, the magnetic plate member 44 is laminated to form the rotor cores 70 and 80. However, when the magnetic plate member 44 is laminated in the same direction when it is manufactured by pressing or the like, the thickness of the magnetic plate member 44 is increased. Since the intersections of these are concentrated on one side, the axial thickness of the rotor core varies. Therefore, as shown in FIG. 9, the axial thickness of the rotor core 61 can be made substantially uniform by rotating the second rotor core 80 about the first rotor core 70 in the circumferential direction and stacking them. it can. In this way, the axial end surface of the rotor core 61 can be made substantially parallel to the surface orthogonal to the rotational axis C of the shaft 24, and the end face plate 90 is securely attached to the axial end surface of the rotor core 61. Can do.

  DESCRIPTION OF SYMBOLS 22 ... Rotor 24 ... Shaft 44 ... Magnetic plate material (flat steel plate) 61 ... Rotor core 65 ... Pin 70 ... 1st rotor core 74 ... Permanent magnet 75 ... Opening part 78 ... 1st pin hole 79 ... 3rd pin hole 80 ... 2nd rotor core 84 ... Permanent magnet 85 ... Opening 88 ... Second pin hole 89 ... Fourth pin hole C ... Center of axis, rotation axis E ... Line segment

Claims (7)

A rotor core having a cylindrical first rotor core and a second rotor core;
A plurality of permanent magnets arranged at substantially equal intervals in the circumferential direction on the first rotor core and the second rotor core,
In the rotor provided with a rotatable shaft at the axial center of the first rotor core and the second rotor core,
A first pin hole is formed in the first rotor core along the axial direction, and a second pin hole is formed in the second rotor core along the axial direction.
The first pin hole and the second pin hole have the same radial distance from the axis center, and an angle formed by the first pin hole and the second pin hole with respect to the axis is θ × N + S position However, θ = An angle formed by the circumferential center of adjacent permanent magnets around the axis
N = any integer less than or equal to the number of permanent magnets
S = formed at skew angles between the first rotor core and the second rotor core,
A rotor in which a pin is inserted through the first pin hole and the second pin hole to position the first rotor core and the second rotor core.   The angle between the first pin hole and the circumferential center of the permanent magnet and the angle between the second pin hole and the circumferential center of the permanent magnet with respect to the axis are the axis center and the permanent magnet. 2. The rotor according to claim 1, wherein the first pin hole and the second pin hole are formed at positions of S / 2, respectively, with a line segment connecting to a circumferential center of the rotor.   3. The rotor according to claim 1, wherein a third pin hole is formed at a position different from the first pin hole in the circumferential direction by 180 ° in the first rotor core.   4. The rotor according to claim 3, wherein a fourth pin hole is formed at a position that is 180 ° different in the circumferential direction of the second pin hole in the second rotor core. 5. The first rotor core and the second rotor core are both formed by laminating flat steel plates,
The first rotor core and the second rotor core are both configured with no inversion,
The said 1st rotor core and the said 2nd rotor core are laminated | stacked on the said axial direction in the state which rotated the said 2nd rotor core 180 degrees with respect to the said 1st rotor core, The Claims 1-4 characterized by the above-mentioned. The rotor according to any one of the above.   The rotor according to claim 1, wherein both the first pin hole and the second pin hole are formed in each of the first rotor core and the second rotor core. A rotor core having a cylindrical first rotor core and a second rotor core;
A plurality of permanent magnets arranged at substantially equal intervals in the circumferential direction on the first rotor core and the second rotor core,
In the method of manufacturing a rotor, wherein a rotatable shaft is provided at the axial center of the first rotor core and the second rotor core,
Forming a first pin hole in the first rotor core along the axial direction;
The second rotor core has a radial distance from the center of the first pin hole and the shaft center, and an angle formed by the first pin hole with the shaft as a center is θ × N + S where θ = axis The angle formed by the circumferential center of adjacent permanent magnets around
N = any integer less than or equal to the number of permanent magnets
Forming a second pin hole so that S = the skew angle between the first rotor core and the second rotor core;
Inserting a pin longer than the axial length of the first rotor core into the first pin hole of the first rotor core;
Inserting the pin protruding from the first rotor core into the second pin hole of the second rotor core;
And a step of inserting the shaft through an opening formed at the axial center of the first yoke and the second yoke in a state where the pin is inserted.

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