JP2017135804A - Manufacturing method of motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manufacturing method of a motor capable of reducing cost by simplifying a manufacturing process of a rotor core in the motor in which the number of required sheets is different between a rotor core sheet and a stator core sheet.SOLUTION: Main rotor core sheets 67a as many as stator core sheets 18 are formed by punching together with the stator core sheets. Auxiliary rotor core sheets 67b as many as the lacked number of rotor core sheets are formed by punching a metal plate of which the hardness is lower than that of a raw material of the stator core sheet. A rotor core 52 is formed by laminating the main rotor core sheets and the auxiliary rotor core sheets, and a rotary shaft 51 is press-fitted from the side of the auxiliary rotor core sheets 67b that are laminated at one end side of the rotor core in an axial direction, to the rotor core 52.SELECTED DRAWING: Figure 7

Description

  The present invention relates to a method of manufacturing a motor including a stator core and a rotor core configured by laminating metal plates having magnetism.

  As shown in FIG. 10, conventionally, as one type of motor, a stator core 1 is formed by laminating metal plates with magnetism, and a rotor core 2 is formed by laminating metal plates with the same magnetism. is there. The stator core 1 is laminated with a stator core sheet 3 formed by stamping a metal plate by pressing, and the rotor core 2 is laminated with a rotor core sheet 4 formed by punching a metal plate by pressing.

  A rotary shaft 5 is inserted into the rotor core 2 to constitute a rotor 6, and both ends of the rotary shaft 5 are rotatably supported by the frame. The rotor 6 is rotated based on the magnetic force generated in the stator core 1, and a required rotational force can be output from the rotary shaft 5 that rotates together with the rotor 6.

  In such a motor, magnetic plates 7 are attached to both axial sides of the stator core 1, and the magnetic plate 7 is provided with a rotor facing portion 8 having an L-shaped cross section, thereby suppressing leakage flux and increasing the height of the motor. Output is planned.

  Patent Document 1 discloses a motor including a magnetic plate as described above on a stator core.

JP 2014-147177 A

  In the motor as described above, the stator core sheet 3 and the rotor core sheet 4 are formed by punching a common electromagnetic steel sheet material. Then, the rotor core sheet 4 is punched inside the punched portion of the stator core sheet 3, and the stator core sheet 3 and the rotor core sheet 4 are punched one by one. By repeating such pressing, the same number of stator core sheets 3 and rotor core sheets 4 can be manufactured.

  However, the provision of the magnetic plate 7 increases the axial length of the stator core. Therefore, since it is necessary to secure the number of rotor core sheets 4 required for constituting the rotor core 2 more than the number of stator core sheets 3, when the stator core sheet 3 and the rotor core sheet 4 are punched from a common electromagnetic steel sheet material, A deficiency 4a occurs in the rotor core sheet 4.

  Further, if the rotor core sheet 4 and the stator core sheet 3 are pressed according to the required number of rotor core sheets 4, the stator core sheet is wasted, and the manufacturing cost is increased.

In the motor disclosed in Patent Document 1, a manufacturing method for the insufficient number of rotor core sheets is not disclosed.
An object of the present invention is to provide a method of manufacturing a motor that can reduce the cost by simplifying the manufacturing process of the rotor core in a motor in which the required number of rotor core sheets and stator core sheets are different.

  A method of manufacturing a motor that solves the above problems is to punch a metal plate material by press working to form a plurality of stator core sheets and a plurality of rotor core sheets, and stack the plurality of stator core sheets to form a stator core. In addition, an axially extending portion that increases an opposing area to the rotor core is provided at an axial end portion of the stator core, and a larger number of rotor cores than the stator core sheet are provided to oppose the stator core including the axially extending portion. In a motor manufacturing method in which a rotor core is formed by laminating sheets and press-fitting a rotation shaft, the same number of main rotor core sheets as the stator core sheets are punched together with the stator core sheets, and the number of rotor core sheets is insufficient. The auxiliary rotor core sheet is the stator core sheet The auxiliary rotor core side formed by punching a metal plate having a lower hardness than the raw material, laminating the main rotor core sheet and the auxiliary rotor core sheet to form a rotor core, and laminating the rotating shaft on one axial end side of the rotor core To press into the rotor core.

According to this method, the rotating shaft is press-fitted into the rotor core from the auxiliary rotor core sheet side that is softer than the main rotor core sheet.
In the motor manufacturing method, the stator core sheet and the main rotor core sheet are formed by punching an electromagnetic steel plate material, and the auxiliary rotor core sheet is formed by punching a cold rolled steel plate material.

According to this method, the auxiliary rotor core sheet is formed of a cold-rolled steel plate that is softer than the main rotor core sheet.
In the motor manufacturing method, the rotating shaft is formed of a metal material harder than the auxiliary rotor core sheet.

According to this method, when the rotating shaft is press-fitted into the auxiliary rotor core sheet, the generation of burrs is suppressed.
In the motor manufacturing method, a metal plate material is punched out by pressing to form a plurality of stator core sheets and a plurality of rotor core sheets, and the stator core sheets are laminated to form a stator core, and the stator core An axially extending portion that increases an area facing the rotor core is provided at an axial end portion of the rotor, and a larger number of rotor core sheets than the stator core sheet are stacked so as to oppose the stator core including the axially extending portion. In addition, in the motor manufacturing method of forming a rotor core by press-fitting a rotating shaft, an auxiliary rotor core that is formed by punching the inner side of the stator core sheet and forming the same number of main rotor core sheets as the stator core sheet. Stator core sheet of other motor I punched the inside formed.

  According to this method, the main rotor core sheet is formed by punching together with the stator core sheet of the same motor, and the auxiliary rotor core sheet is formed by punching together with the stator core sheet of another motor.

In the motor manufacturing method, the auxiliary rotor core sheet is formed by stamping together with a stator core sheet of a Landel motor.
According to this method, the auxiliary rotor core sheet is formed by being punched together with the stator core sheet of the Landell motor.

  According to the present invention, in a motor in which the required number of rotor core sheets and stator core sheets are different, the manufacturing process of the rotor core can be simplified and the cost can be reduced.

1 is a cross-sectional view illustrating a schematic configuration of a motor according to an embodiment. The disassembled perspective view of the motor of one Embodiment. (A) is a side view of the motor of one embodiment, (b) is a bb cross-sectional view. (A) is a perspective view of the 2nd end frame in one embodiment, (b) is a partial expansion perspective view of the 2nd end frame. The partial expanded sectional view of the motor of one embodiment. The partial expansion perspective view of the motor of one embodiment. Sectional drawing which shows the stator core and rotor core of the motor of one Embodiment. Explanatory drawing which shows the manufacturing process of a stator core sheet and a rotor core sheet. Explanatory drawing which shows the manufacturing process of a stator core sheet and a rotor core sheet. The schematic diagram which shows a prior art example.

(First embodiment)
Hereinafter, a first embodiment of a method for manufacturing a motor will be described.
As shown in FIG. 1, the motor 10 has an annular stator 13 as a rotation shaft by a first end frame (hereinafter referred to as a first frame 11) and a second end frame (hereinafter referred to as a second frame 12). The structure is sandwiched in the direction. The first frame 11 and the second frame 12 are fixed to each other by a plurality of (two in the present embodiment) through bolts 14 arranged on the outer periphery of the stator 13. A rotor 15 is rotatably arranged inside the stator 13. In this embodiment, the end frame that holds the stator 13 on the opposite side in the axial direction of the motor 10 (upper side in FIG. 1) is referred to as the first frame 11, and the end frame that holds the stator 13 on the axial direction output side is the first frame. Two frames 12 are provided.

  As shown in FIGS. 1 and 2, the stator 13 includes an annular stator core 16 and a coil 17 wound around the stator core 16. As shown in FIG. 3B, the stator core 16 includes an annular portion 16a having an annular shape, and a plurality (60 in the present embodiment) of teeth 16b extending radially inward from the annular portion 16a and arranged in the circumferential direction. It is composed of four core outer protrusions 16c that protrude radially outward from the outer peripheral surface of the annular part 16a and extend along the axial direction. The outer peripheral surface of the annular portion 16a has a cylindrical shape, and both end surfaces in the axial direction of the annular portion 16a have a planar shape orthogonal to the axial direction. The coil 17 is wound around the plurality of teeth 16b.

  As shown in FIGS. 3 (a) and 3 (b), the core outer peripheral protruding portion 16c has four equiangular intervals (90 ° intervals in the present embodiment) in the circumferential direction on the outer peripheral surface of the annular portion 16a. Is provided. Each core outer protrusion 16c forms a ridge extending along the axial direction from one end of the annular portion 16a to the other end, and the shape seen from the axial direction extends in the circumferential direction from the proximal end toward the distal end. It has a substantially trapezoidal shape with a narrow width. Further, each core outer periphery protruding portion 16c is formed with an arc recess 16d that is recessed from the distal end (radially outer end) of each core outer periphery protruding portion 16c toward the base end. The circular arc recess 16d has a circular arc shape when viewed from the axial direction and a groove shape penetrating the core outer peripheral protruding portion 16c in the axial direction. Note that the radius of curvature of the arc recess 16d is slightly larger than the radius of the male screw-like portion of the through bolt 14. And two core outer periphery protrusions 16c (two core outer periphery protrusions provided on the left and right in FIG. 3B) provided at two positions 180 ° apart in the circumferential direction among the four core outer periphery protrusions 16c. A through bolt 14 having a substantially cylindrical shape extending in the axial direction is disposed in the arc recess 16d of 16c). These two core outer peripheral protrusions 16c surround about half of the outer periphery of the through bolt 14 when viewed from the axial direction.

  As shown in FIG. 1, the stator core 16 is formed by laminating a plurality of stator core sheets 18 formed by punching an electromagnetic steel plate material by press working and then caulking them together. An L-shaped core 66 having an L-shaped cross section having a rotor facing portion 65 extending outward in the axial direction is attached to both ends of the stator core 16 in the axial direction.

  Accordingly, the axial length of the radially inner end face 16e (the face facing the rotor 15) of the teeth 16b is achieved while keeping the stack thickness of the stator core 16 (the thickness of the stacked stator core sheet 18 and the L-shaped core 66 as a whole) small. It is possible to ensure. In FIG. 3A and FIG. 6, the stator core 16 is omitted and the stator core 16 is simplified and illustrated.

  As shown in FIGS. 1 and 2, the first frame 11 and the second frame 12 arranged on both sides of the stator core 16 in the axial direction are made of a metal material and formed by casting. The first and second frames 11, 12 are substantially disc-shaped first and second main body portions 21, 31, and cylindrical first members extending in the axial direction from the first and second main body portions 21, 31. And second stator holding portions 22 and 32, respectively. In addition, the first and second frames 11 and 12 include a plurality of (in the present embodiment, integrally provided on the outer peripheral surfaces of the first and second stator holding portions 22 and 32 and the first and second main body portions 21 and 31. First and second bolt fastening portions 23, 33). The first and second bolt fastening portions 23 and 33 are provided at equiangular intervals in the circumferential direction (180 ° intervals in the present embodiment). As shown in FIGS. 2 and 3B, each first bolt fastening portion 23 is formed with a first fastening hole 23 a through which the through bolt 14 is inserted, and each second bolt fastening portion 33. Is formed with a female screw-like second fastening hole 33a into which the through bolt 14 is screwed. In the first frame 11 and the second frame 12, the first and second bolt fastening portions 23 and 33 are connected to each other by the through bolt 14 that passes through the first fastening hole 23a and is screwed into the second fastening hole 33a. Thus, they are fixed and integrated with each other. Further, the second frame 12 has a fixing portion 34 for fixing the motor 10 to an external fixing place with a screw (not shown). The fixing portion 34 is extended radially outward from two locations in the second main body portion 31 that are displaced in the circumferential direction from the two second bolt fastening portions 33. For example, the motor 10 is fixed at a fixed place such that the second frame 12 is positioned below the first frame 11.

  As shown in FIGS. 2 and 3 (a), one end of the stator core 16 in the axial direction (the upper end in FIG. 3 (a)) is fitted radially inward at the tip of the first stator holding portion 22. A first fitting portion 25 is formed. Similarly, a second fitting portion 35 in which the other axial end portion (the lower end portion in FIG. 3A) of the stator core 16 is fitted radially inward is provided at the distal end portion of the second stator holding portion 32. Is formed.

  The first fitting portion 25 is composed of a plurality (four in this embodiment) of first fitting walls 25a that are spaced apart in the circumferential direction. The four first fitting walls 25a are provided at equiangular intervals (90 ° intervals in the present embodiment) in the circumferential direction. Further, the four first fitting walls 25a are arranged one by one between the core outer peripheral protrusions 16c adjacent in the circumferential direction. That is, the core outer peripheral protrusion 16c is positioned between the first fitting walls 25a adjacent in the circumferential direction and overlaps the first fitting wall 25a in the circumferential direction. The core outer periphery protruding portion 16c does not overlap the first fitting wall 25a in the radial direction. The second fitting portion 35 is composed of a plurality of (eight in the present embodiment) second fitting walls 35a that are spaced apart in the circumferential direction. One second fitting wall 35a is disposed on each side in the circumferential direction of each core outer peripheral protrusion 16c (that is, two between the core outer peripheral protrusions 16c adjacent in the circumferential direction). That is, the core outer peripheral protrusion 16c is positioned between the second fitting walls 35a adjacent in the circumferential direction and overlaps with the second fitting wall 35a in the circumferential direction. The core outer periphery protruding portion 16c does not overlap the second fitting wall 35a in the radial direction.

  The first and second fitting portions 25, 35 (first and second fitting walls 25 a, 35 a) are more radially thicker than the proximal end portions of the first and second stator holding portions 22, 32. Is formed thinly. The first and second fitting walls 25a and 35a extend in parallel with the axial direction and have an arc shape along the circumferential direction when viewed from the axial direction. Further, each of the first and second fitting walls 25a and 35a has a narrower width in the circumferential direction from the proximal end toward the distal end (ends on the distal end side of the first and second stator holding portions 22 and 35). .

  As shown in FIG. 2, FIG. 4 (a) and FIG. 4 (b), the inner peripheral surfaces of the first and second fitting portions 25, 35, that is, the diameters of the first and second fitting walls 25a, 35a. The side surfaces on the inner side are first and second centering surfaces 25 b and 35 b for centering the first and second frames 11 and 12 and the stator core 16. In FIG. 4B, dots are given to the second centering surface 35b. The first and second centering surfaces 25b, 35b are inner peripheral surfaces of the first and second fitting portions 25, 35 (in order to increase the dimensional accuracy of the inner peripheral surfaces of the first and second fitting portions 25, 35). That is, it is a surface formed by cutting the radially inner side surfaces of the first and second fitting walls 25a and 35a. In the first frame 11, the four first centering surfaces 25 b are located on the same circle having the center on the central axis of the first stator holding portion 22 when viewed from the axial direction. Similarly, in the second frame 12, the eight second centering surfaces 35b are located on the same circle having the center on the central axis of the second stator holding portion 32 when viewed from the axial direction (FIG. 3B). )reference). In the motor 10, the central axes of the first and second stator holding portions 22, 32 coincide with the central axis of the stator core 16. As shown in FIGS. 2 and 3B, the inner diameters of the first and second fitting portions 25 and 35 are equal to or slightly larger than the outer diameter of the annular portion 16a. That is, the radius of curvature of the first and second centering surfaces 25b and 35b is equal to or slightly larger than the radius of the annular portion 16a. On the other hand, as shown in FIG. 1, the inner diameter of the first and second stator holding portions 22, 32 on the proximal side of the first and second fitting portions 25, 35 is outside the annular portion 16 a. The value is smaller than the diameter.

  As shown in FIGS. 2, 4 (a), and 4 (b), the first and second frames 11, 12 are arranged in a direction perpendicular to the central axes of the first and second stator holding portions 22, 32. It has the 1st and 2nd contact surfaces 26 and 36 adjacent to the base end part of the 1 and 2nd fitting parts 25 and 35. As shown in FIG. In FIG. 4B, dots that are rougher than the dots attached to the second centering surface 35b are attached to the second contact surface 36. In the second frame 12, the second abutment surface 36 includes an axial tip end surface excluding the second fitting portion 35 in the second stator holding portion 32, and an axial direction on the stator core 16 side in the second bolt fastening portion 33. It is provided over the end surface and forms an annular shape. As shown in FIGS. 1, 2, and 3 (a), in the first frame 11, the first contact surface 26 is an axial front end surface excluding the first fitting portion 25 in the first stator holding portion 22. , And the axial end surface of the first bolt fastening portion 23 on the stator core 16 side, and has an annular shape. Further, the first and second contact surfaces 26 and 36 have a planar shape orthogonal to the central axis of the first and second stator holding portions 22 and 32 (same as the axis L1 of the rotation shaft 51 of the rotor 15 described later). There is no. Furthermore, since the first and second contact surfaces 26 and 36 are flat surfaces that are not cut and are not cut, they are flat surfaces that are not stepped. The first abutting surface 26 has one axial end surface (the upper end surface in FIG. 3A) of the annular portion 16a fitted in the first fitting portion 25, and the axis of each core outer peripheral protruding portion 16c. One end surface in the direction (upper end surface in FIG. 3A) is in contact with the axial direction. Further, the second contact surface 36 has the other end surface in the axial direction of the annular portion 16a fitted in the second fitting portion 35 (the lower end surface in FIG. 3A), and the shaft of each core outer peripheral protruding portion 16c. The other end surface in the direction (the lower end surface in FIG. 3A) is in contact with the axial direction. In this state, the first frame 11 and the second frame 12 are fixed to each other by the through bolts 14 while the stator 13 is sandwiched between the first and second stator holding portions 22 and 32.

  In the present embodiment, the first and second fitting portions 25 and 35 (first and second fitting walls 25a and 35a) provided at the tip portions of the first and second stator holding portions 22 and 32 are The first and second contact surfaces 26 and 36 protrude in the axial direction. Therefore, the first centering surface 25b and the first contact surface 26 are close to each other at a right angle in the first frame 11, and the second centering surface 35b and the second contact surface 36 are in the second frame 12. They are close to each other at a right angle.

  As shown in FIG. 1, FIG. 4B and FIG. 5, the first and second stator holding portions 22 and 32 have first and second centering surfaces 25b and 35b and first and second contacts. First and second cutting suppression grooves 27 and 37 are provided at the boundary portions with the contact surfaces 26 and 36. The first and second cutting suppression grooves 27 and 37 are formed when the inner peripheral surfaces of the first and second fitting portions 25 and 35 are cut to form the first and second centering surfaces 25b and 35b. This is to prevent the first and second contact surfaces 26 and 36 from being cut. The first and second cutting suppression grooves 27 and 37 are formed in the first and second stator holding portions 22 and 32 at the first and second fitting walls 25a and 35a at the radially inner portions of the base ends of the first and second fitting walls 25a and 35a. The second centering surfaces 25b and 35b extend along end portions on the first and second contact surfaces 26 and 36 side. The first and second cutting suppression grooves 27 and 37 are recessed in the axial direction. Furthermore, the circumferential lengths of the first and second cutting suppression grooves 27 and 37 are substantially equal to the circumferential widths at the base end portions of the first and second fitting walls 25a and 35a.

  As shown in FIG. 1, a pressurized surface 28 is formed on the axially outer end surface of the first body portion 21, and a pressurized surface 38 is formed on the axially outer end surface of the second body portion 31. . Each of the pressurized surfaces 28 and 38 has a planar shape orthogonal to an axis L1 of a rotation shaft 51 of the rotor 15 described later. Further, the pressurized surface 28 is parallel to the first contact surface 26, and the pressurized surface 38 is parallel to the second contact surface 36. In addition, a stepped portion 39 that protrudes outward in the axial direction from the pressed surface 38 is formed on the axially outer end surface of the second frame 12.

  A bearing housing portion 29 is formed in the center portion of the first main body portion 21 so as to be recessed so that the ball bearing B1 can be assembled from the axial stator 13 side (inside the motor 10). The bearing housing portion 29 has a circular shape when viewed in the axial direction, and has a cylindrical shape with an inner peripheral surface extending in the axial direction. Further, the central axis of the bearing housing portion 29 coincides with the central axis of the first stator holding portion 22 (the central axis of the first fitting portion 25). The first frame 11 accommodates and holds an annular ball bearing B1 in the bearing accommodating portion 29. A through hole 29 a is formed in the center of the bottom of the bearing housing 29 so as to penetrate the bottom of the bearing housing 29 in the axial direction. The ball bearing B1 is urged in the axial direction toward the stator 13 between the radially outer portion of the through hole 29a at the bottom of the bearing housing 29 and the ball bearing B1 housed in the bearing housing 29. A wave washer 41 is interposed.

  A bearing housing portion 40 that houses and holds an annular ball bearing B <b> 2 is recessed in the central portion of the second main body portion 31. The bearing housing portion 40 has a concave shape that is recessed from the axially outer end surface of the second frame 12 toward the inner side (stator 13 side) of the motor 10. That is, the bearing housing portion 40 is formed so that the ball bearing B2 can be assembled from the outside of the motor 10 (the side opposite to the stator 13). Further, the center axis of the bearing housing portion 40 coincides with the center axis of the second stator holding portion 32 (the center axis of the second fitting portion 35). The second frame 12 holds the ball bearing B <b> 2 disposed in the bearing housing portion 40 so as to be coaxial with the ball bearing B <b> 1 held by the first frame 11. Further, the ball bearing B <b> 2 is axially positioned by contacting the bottom of the bearing housing portion 40 from the axial direction. A through hole 40 a that penetrates the bottom of the bearing housing 40 in the axial direction is formed at the center of the bottom of the bearing housing 40.

  The rotor 15 includes a rotating shaft 51 rotatably supported by the ball bearings B1 and B2, a cylindrical rotor core 52 fixed to the rotating shaft 51 so as to be integrally rotatable, and a plurality of members fixed to the outer peripheral surface of the rotor core 52. It consists of a magnet 53. Each magnet 53 faces the inner peripheral surface of the stator core 16 (the radially inner end surface 16e of the teeth 16b) in the radial direction. The distal end portion (lower end portion in FIG. 1) of the rotating shaft 51 passes through the through hole 40a and protrudes from the ball bearing B2 to the outside of the motor 10, and a joint (not shown) as an output portion is formed at the protruding portion. Installed.

  As shown in FIG. 2, a control unit 61 is fixed to the outer surface of the first frame 11. The control unit 61 includes a cover 62 fixed to the first frame 11 and a circuit board 63 accommodated inside the cover 62. The end of the coil 17 is electrically connected to the circuit board 63. Further, a connector part 64 to which an external connector (not shown) for supplying power to the motor 10 is connected is fixed to the circuit board 63, and the connector part 64 is exposed to the outside of the cover 62. Then, the power supplied from the external connector is supplied to the coil 17 via the circuit board 63, so that the rotor 15 rotates.

  As shown in FIG. 7, the rotor core 52 of the rotor 15 is configured by laminating a plurality of rotor core sheets 67. The thickness of each rotor core sheet 67 is the same as the thickness of the stator core sheet 18. In order to make the outer peripheral surface of the rotor core 52 face the entire inner peripheral surface of the stator core 16 including the L-shaped core 66, the rotor core sheet 67 includes the same number of main rotor core sheets 67a as the number of stacked stator core sheets 18, and a shortage of auxiliary. And a rotor core sheet 67b.

  The main rotor core sheet 67a is formed from a magnetic steel sheet material common to the stator core sheet 18 by press working. That is, as shown in FIG. 8, the stator core sheet 18 and the main rotor core sheet 67a are formed one by one from the common electromagnetic steel sheet material 68 by press working.

The auxiliary rotor core sheet 67b is formed by punching a spcc material (cold rolled steel plate) softer than the electromagnetic steel plate material in a separate process.
With the motor as described above, the following effects can be obtained.
(1) The auxiliary rotor core sheet 67b was formed by punching a spcc material having a lower cost than the electromagnetic steel plate material. Therefore, the axial length of the rotor core 52 can be ensured to increase the output of the motor.
(2) The manufacturing cost can be reduced as compared with the case where the auxiliary rotor core sheet 67b is formed by punching a magnetic steel sheet material common to the stator core sheet 18.
(3) The auxiliary rotor core sheet 67b formed of spcc material has lower hardness than the main rotor core sheet 67a formed of electromagnetic steel sheet material. Then, when the auxiliary rotor core sheet 67b is stacked on one end side in the axial direction of the rotor core 52 and the rotating shaft 51 is press-fitted into the rotor core 52 from the one end side in the axial direction, generation of burrs on the rotating shaft 51 can be suppressed. Accordingly, the manufacturing cost can be reduced by omitting the step of removing the burrs.
(Second embodiment)
In this embodiment, the auxiliary rotor core sheet 67b is formed by, for example, a stamping process of a stator core sheet of a Landell type motor.

  As shown in FIG. 9, when the stator core sheet 69 of the Landel motor is punched and formed with the electromagnetic steel plate material 68, the auxiliary rotor core sheet 67 b is simultaneously punched and formed inside the stator core sheet 69.

  In such a manufacturing method, the auxiliary rotor core sheet 67b can be formed in the stamping process of the stator core sheet 69 of the Landell motor. Therefore, another process for forming the auxiliary rotor core sheet 67b can be omitted, and the electromagnetic steel sheet material 68 as a raw material can be effectively used.

You may implement the said embodiment in the following aspects.
The auxiliary rotor core sheet 67b may be formed by a punching process of a stator core sheet of a motor other than the Landell motor.

  DESCRIPTION OF SYMBOLS 15 ... Rotor, 16 ... Stator core, 18, 69 ... Stator core sheet, 51 ... Rotating shaft, 66 ... Axial extension part (L-shaped core), 67 ... Rotor core sheet, 67a ... Main rotor core sheet, 67b ... Auxiliary rotor core sheet, 68: Magnetic steel sheet material.

Claims (5)

A metal plate material is punched out by pressing to form a plurality of stator core sheets and a plurality of rotor core sheets, and the stator core sheet is formed by laminating the plurality of stator core sheets. A rotor core is provided by providing an axially extending portion that increases an opposing area to the rotor core, and laminating a larger number of rotor core sheets than the stator core sheet and press-fitting a rotating shaft in order to face the stator core including the axially extending portion. In the manufacturing method of the motor forming
The same number of main rotor core sheets as the stator core sheet are formed by punching together with the stator core sheet, and the auxiliary rotor core sheet corresponding to the insufficient number of rotor core sheets is formed by punching a metal plate having a lower hardness than the raw material of the stator core sheet, The main rotor core sheet and the auxiliary rotor core sheet are laminated to form a rotor core, and the rotating shaft is press-fitted into the rotor core from the auxiliary rotor core sheet side laminated on one axial end side of the rotor core. Production method.   2. The method of manufacturing a motor according to claim 1, wherein the stator core sheet and the main rotor core sheet are formed by punching an electromagnetic steel sheet, and the auxiliary rotor core sheet is formed by punching a cold rolled steel sheet.   The method of manufacturing a motor according to claim 1, wherein the rotation shaft is formed of a metal material harder than the auxiliary rotor core sheet. A metal plate material is punched out by pressing to form a plurality of stator core sheets and a plurality of rotor core sheets, and the stator core sheet is formed by laminating the plurality of stator core sheets. A rotor core is provided by providing an axially extending portion that increases an opposing area to the rotor core, and laminating a larger number of rotor core sheets than the stator core sheet and press-fitting a rotating shaft in order to face the stator core including the axially extending portion. In the manufacturing method of the motor forming
Forming the same number of main rotor core sheets as the stator core sheet by punching the inside of the stator core sheet, and forming the auxiliary rotor core sheet corresponding to the insufficient number of rotor core sheets by punching the inside of the stator core sheet of another motor. A manufacturing method of a motor characterized by the above.   5. The method of manufacturing a motor according to claim 4, wherein the auxiliary rotor core sheet is formed by stamping together with a stator core sheet of a Landell motor.

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