JP5087583B2 - Electric motor and method of manufacturing electric motor - Google Patents

Description

The present invention relates to a manufacturing method of the motor contact and electric motor.

  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.

The present invention has been made in view of the above circumstances, it is to provide a method for producing a skewed rotor core capable of providing a motor contact and the motor 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 through hole (for example, the embodiment) formed in the axial center (for example, the axial center C in the embodiment) of the first rotor core and the second rotor core. And a shaft (for example, the shaft 24 in the embodiment) inserted through the through holes 75 and 85) in the electric motor. (For example, in the motor 23 in the embodiment), the shaft has a rotor core insertion portion having an outer diameter smaller than the inner diameter of the through hole (for example, the rotor core insertion portion 24a in the embodiment) and an outer diameter larger than the inner diameter of the through hole. A rotor core press-fit portion (for example, the rotor core press-fit portion 24b in the embodiment), and in the vicinity of the boundary between the rotor core press-fit portion and the rotor core insertion portion, a pin (for example, the pin 65 in the embodiment) in the radial direction. An insertable pin hole (for example, the pin hole 66 in the embodiment) is formed, and the inner peripheral surface (for example, the inner peripheral surface 75a in the embodiment) of the through hole of the first rotor core extends along the axial direction. The first groove portion (for example, the first groove portion 78 in the embodiment) is formed, and the inner peripheral surface of the through hole of the second rotor core For example, the second groove portion (for example, the second groove portion 88 in the embodiment) is formed along the axial direction on the inner peripheral surface 85a in the embodiment, and the first groove portion and the second groove portion are formed by connecting the shaft. The angle formed by the first groove and the second groove as the center is θ × N + S, where θ = the 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 skew angles between the first rotor core and the second rotor core, and the through holes of the first rotor core and the second rotor core are inserted into the shaft with the pins inserted into the pin holes. The first rotor core and the second rotor core are positioned.

  According to a second 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.

  According to a third aspect of the invention, the first rotor core and the second rotor core have accommodation holes (for example, accommodation holes 73 and 83 in the embodiment) that can accommodate the permanent magnets at substantially equal intervals in the circumferential direction. The permanent magnet is arranged in the accommodation hole.

  According to a fourth aspect of the present invention, an end face plate (for example, the end face plate 90 in the embodiment) is provided on the outer side in the axial direction of both end faces in the axial direction of the rotor core (for example, the end faces 70a and 80b in the embodiment). It is characterized by that.

  The invention described in claim 5 is characterized in that the first groove portion and the second groove portion are formed in each of the first rotor core and the second rotor core.

The invention described in claim 6 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, And a rotor core insertion portion having an outer diameter smaller than the inner diameter of the through hole and larger than the inner diameter of the through hole. A rotor core press-fit portion having an outer diameter, and a shaft in which a pin hole into which a pin can be inserted in a radial direction is formed in the vicinity of the boundary between the rotor core press-fit portion and the rotor core insertion portion. A method of forming a first groove portion along an axial direction on an inner peripheral surface of the through hole of the first rotor core, and an inner peripheral surface of the through hole of the second rotor core; About an axis, the angle of the circumferential center of the position of the angle is θ × N + S of the first groove, however, the permanent magnets adjacent around the theta = axial
N = any integer less than or equal to the number of permanent magnets
S = a step of forming the second groove portion along the axial direction so as to have a skew angle between the first rotor core and the second rotor core; a step of inserting the pin into the pin hole of the shaft; Inserting the first rotor core into the shaft while inserting the pin through the first groove portion of the rotor core and guiding the first rotor core; and inserting the pin into the second groove portion of the second rotor core And pressing the second rotor core into the shaft while guiding the second rotor core.

  According to the first aspect of the present invention, the pins protruding in the radial direction from the outer peripheral surface of the shaft are inserted into the first groove portion of the first rotor core and the second groove portion of the second rotor core, and the first rotor core and the second rotor core are connected to the shaft. The first rotor core and the second rotor core can be held in a state of being shifted by the skew angle S by being press-fitted and fixed to. Therefore, it is possible to skew the first rotor core and the second rotor core by a desired angle simply by forming the first groove portion and the second groove portion and attaching the pin to the shaft. That is, a skewed rotor core can be obtained with a simple configuration.

  According to the second 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 third aspect of the present invention, the invention can be applied to a so-called IPM (Interior Permanent Magnet) motor in which a permanent magnet is embedded in an accommodation hole formed in a rotor core. Therefore, it is possible to cope with a high rotational speed, and it is possible to increase the efficiency and output of the motor.

  According to the invention described in claim 4, by providing the end face plates on the both axial end faces of the rotor core, it is possible to reliably prevent the permanent magnet from falling off the rotor core.

  According to the invention described in claim 5, 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 sixth aspect of the present invention, the pins protruding in the radial direction from the outer peripheral surface of the shaft are inserted into the first groove portion of the first rotor core and the second groove portion of the second rotor core, and the first rotor core and the second rotor core are connected to the shaft. The first rotor core and the second rotor core can be held in a state of being shifted by the skew angle S by being press-fitted and fixed to. Therefore, it is possible to skew the first rotor core and the second rotor core by a desired angle simply by forming the first groove portion and the second groove portion and attaching the pin to the shaft. That is, 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 a perspective view of the shaft 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 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.

  Further, through holes 75 and 85 are respectively formed in the 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 through holes 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. A through hole 75 penetrating therethrough is formed. 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 accommodation holes 73 are arranged 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 penetrates in the axial direction of the second rotor core 80 at the central portion in the radial direction. A hole 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. That is, the motor 23 of this embodiment is a so-called IPM (Interior Permanent Magnet) motor in which permanent magnets 74 and 84 are embedded in the rotor cores 70 and 80.

  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 groove portion 78 is formed along the axial direction on the inner peripheral surface 75 a of the through hole 75 of the first rotor core 70. Further, the first groove 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 E connecting the shaft center C and the rib 77 closest to the first groove 78. . Note that S is a skew angle between the first rotor core 70 and the second rotor core 80.

  As shown in FIG. 5, a second groove 88 is formed along the axial direction on the inner peripheral surface 85 a of the through hole 85 of the second rotor core 80. The second groove portion 88 is formed at a position shifted by S / 2 in the counterclockwise circumferential direction in a front view with respect to a line segment E connecting the shaft center C and the rib 87 closest to the second groove portion 88. Yes. The second groove 88 is formed in substantially the same shape as the first groove 78.

  The first groove portion 78 and the second groove portion 88 are formed so that the angle between the first groove portion 78 and the second groove portion 88 is formed at a position of θ × N + S with the axis center (rotation axis) C as the center. Good. 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.

  Further, in the present embodiment, the first rotor core 70 is formed with the first groove 78, and the second rotor core 80 is formed with the second groove 88. However, both the rotor cores 70, 80 have the first groove 78 and The second groove 88 may be formed. 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.

  As shown in FIG. 6, a helical gear 28 is provided on one end side of the shaft 24. Further, the other end side of the shaft 24 is formed with a rotor core insertion portion 24a having an outer diameter slightly smaller than the inner diameters of the through hole 75 of the first rotor core 70 and the through hole 85 of the second rotor core 80. A rotor core press-fit portion 24b having an outer diameter substantially the same as the inner diameter of the through hole 75 of the first rotor core 70 and the through hole 85 of the second rotor core 80 is formed so as to be connected to 24a. Further, a pin hole 66 into which a pin 65 can be inserted is formed on the outer peripheral surface on the rotor core press-fit portion 24b side in the vicinity of the boundary between the rotor core insert portion 24a and the rotor core press-fit portion 24b. The pin 65 is longer than the depth of the pin hole 66, and when the pin 65 is inserted into the pin hole 66, a part of the pin 65 protrudes from the outer peripheral surface 24c of the rotor core press-fitting portion 24b.

Next, a method for manufacturing the motor 23 will be described.
First, the first rotor core 70 is formed by laminating the magnetic plate materials 44 in which the first groove portions 78 are formed. A permanent magnet 74 is disposed in the accommodation hole 73 of the first rotor core 70.

  At approximately the same time, the second rotor core 80 is formed by laminating the magnetic plate materials 44 in which the second groove portions 88 are formed. A permanent magnet 84 is disposed in the accommodation hole 83 of the second rotor core 80.

  Subsequently, as shown in FIG. 7, a pin 65 is attached to the pin hole 66 of the shaft 24. Then, the first rotor core 70 is press-fitted and fixed to the shaft 24. At this time, the first rotor core 70 is inserted from the other end side (rotor core insertion portion 24 a side) of the shaft 24, and the protruding portion 65 a of the pin 65 is inserted into the first groove portion 78 of the first rotor core 70. Then, the first rotor core 70 is press-fitted and fixed by the rotor core press-fitting portion 24 b of the shaft 24 in a state where the first rotor core 70 is positioned by being guided by the pin 65.

  Subsequently, as shown in FIG. 8, the second rotor core 80 is press-fitted and fixed to the shaft 24. At this time, the second rotor core 80 is inserted from the rotor core insertion portion 24 a side of the shaft 24, and the protruding portion 65 a of the pin 65 is inserted into the second groove portion 88 of the second rotor core 80. Then, the second rotor core 80 is press-fitted and fixed by the rotor core press-fitting portion 24 b of the shaft 24 in a state where the second rotor core 80 is positioned by being guided by the pin 65. The second rotor core 80 is press-fitted until it comes into contact with the first rotor core 70. 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. By doing in this way, the 1st rotor core 70 and the 2nd rotor core 80 will contact | abut with the skew angle S, and manufacture of the rotor 22 is completed.

  When the rotor 22 is press-fitted and fixed to the shaft 24, the end plates 90 and 90 are press-fitted and fixed to both ends of the rotor 22 and the rotor 22 is disposed in the motor housing 11 to which the stator 21 is attached. Thus, the manufacture of the motor 23 is completed.

  According to the present embodiment, the pin 65 protruding in the radial direction from the outer peripheral surface 24 c of the shaft 24 is inserted into the first groove portion 78 of the first rotor core 70 and the second groove portion 88 of the second rotor core 80, and the first rotor core 70 and By press-fitting and fixing the second rotor core 80 to the shaft 24, the first rotor core 70 and the second rotor core 80 can be held in a state shifted by the skew angle S. Therefore, the first rotor core 70 and the second rotor core 80 can be skewed by a desired angle simply by forming the first groove portion 78 and the second groove portion 88 and attaching the pin 65 to the shaft 24. That is, the skewed rotor core 61 can be obtained with a simple configuration.

  Further, since the present invention is applied to the IPM motor in which the permanent magnets 74 and 84 are embedded in the receiving holes 73 and 83 formed in the rotor cores 70 and 80, it can cope with a high number of revolutions, and the motor 23 is highly efficient.・ High output can be achieved.

  Further, by providing the end face plates 90 and 90 on the both axial end faces 70a and 80b of the rotor core 61, it is possible to reliably prevent the permanent magnets 74 and 84 from falling off the rotor core 61.

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 case where the first groove portion 78 is formed in the first rotor core 70 and the second groove portion 88 is formed in the second rotor core 80 has been described, but each of the first rotor core 70 and the second rotor core 80 is provided. The first groove part 78 and the second groove part 88 may be formed. By doing in this way, since the shape of the magnetic board material 44 which comprises the 1st rotor core 70 and the 2nd rotor core 80 becomes the same, it can manufacture in the same process and can improve production efficiency.

  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 thickness of the rotor core 61 in the axial direction can be made substantially uniform by rotating the second rotor core 80 by 180 ° with respect to the first rotor core 70 and stacking them. 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.

  Furthermore, in this embodiment, although the case where the pin was provided only in one place was demonstrated, you may comprise so that a rotor core may be press-fit-fixed in the state which attached the pin more than two places.

  DESCRIPTION OF SYMBOLS 22 ... Rotor 23 ... Motor (electric motor) 24 ... Shaft 24a ... Rotor core insertion part 24b ... Rotor core press-fit part 44 ... Magnetic plate material 61 ... Rotor core 65 ... Pin 66 ... Pin hole 70 ... 1st rotor core 70a ... End surface 73 ... Housing hole 74 ... Permanent magnet 75 ... through hole 75a ... inner peripheral surface 78 ... first groove portion 80 ... second rotor core 80b ... end surface 83 ... accommodating hole 84 ... permanent magnet 85 ... through hole 85a ... inner peripheral surface 88 ... second groove portion 90 ... end plate C ... Axis center

Claims (6)

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;
A motor having a shaft inserted through a through-hole formed at an axial center of the first rotor core and the second rotor core;
The shaft has a rotor core insertion portion having an outer diameter smaller than the inner diameter of the through hole, and a rotor core press-fitting portion having an outer diameter larger than the inner diameter of the through hole,
A pin hole into which a pin can be inserted in the radial direction is formed in the vicinity of the boundary with the rotor core insertion portion in the rotor core press-fitting portion,
A first groove portion is formed along the axial direction on the inner peripheral surface of the through hole of the first rotor core, and a second groove portion is formed along the axial direction on the inner peripheral surface of the through hole of the second rotor core. Formed,
The first groove portion and the second groove portion are positions where the angle between the first groove portion and the second groove portion is θ × N + S with the axis as the center, where θ = the permanent magnet adjacent to the axis as the center. Angle formed by the center in the circumferential direction
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,
The first rotor core and the second rotor core are positioned by inserting the through holes of the first rotor core and the second rotor core into the shaft in a state where the pins are inserted into the pin holes. An electric motor characterized by 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 degree | times with respect to the said 1st rotor core. Electric motor.   An accommodation hole capable of accommodating the permanent magnet is formed in the first rotor core and the second rotor core at substantially equal intervals in a circumferential direction, and the permanent magnet is disposed in the accommodation hole. Item 3. The electric motor according to item 1 or 2.   The electric motor according to any one of claims 1 to 3, wherein an end face plate is provided on an axially outer side of both axial end faces of the rotor core.   The electric motor according to claim 1, wherein both the first groove portion and the second groove portion 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;
A rotor core insertion portion having an outer diameter smaller than the inner diameter of the through hole, and a rotor core press-fitting portion having an outer diameter larger than the inner diameter of the through hole, which are inserted into through holes formed at the axial centers of the first rotor core and the second rotor core. And a shaft in which a pin hole into which a pin can be inserted in a radial direction is formed in the vicinity of the boundary with the rotor core insertion portion in the rotor core press-fitting portion, and a method of manufacturing an electric motor,
Forming a first groove portion along an axial direction on an inner peripheral surface of the through hole of the first rotor core;
An angle formed by the first groove portion with respect to the inner peripheral surface of the through hole of the second rotor core with the first axis as the center is θ × N + S, where θ = the center in the circumferential direction of adjacent permanent magnets with the axis as the center Angle
N = any integer less than or equal to the number of permanent magnets
Forming a second groove along the axial direction so that S = the skew angle between the first rotor core and the second rotor core;
Inserting the pin into the pin hole of the shaft;
Inserting the first rotor core into the shaft while inserting the pin through the first groove of the first rotor core and guiding the first rotor core;
And a step of pressing the second rotor core into the shaft while guiding the second rotor core by inserting the pin through the second groove portion of the second rotor core.

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