JP2016163435A - Manufacturing method of lundell type rotor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manufacturing method of a Lundell type rotor which prevents an inter-pole magnet part of a rectification magnet from being damaged when press-fitting a rotary shaft into a rotor.SOLUTION: Before press-fitting a rotary shaft 6, a rotor 7 is mounted on a base 70 that is unrotatable and axially irremovable. At such a time, the rotor is set in such a manner that a first engage pin 79 of the base 70 and a first lock part 27 of a first rotor core 20 are fitted, and the first rotor core 20 is prevented from being rotated in a circumferential direction relatively to the base 70. Next, a second rotor core 30 is pressed from an upper side by an unrotatable presser base 80. At such a time, the second rotor core is set in such a manner that a second engage pin 87 of the presser base 80 and a second lock hole 37 of the second rotor core 30 are fitted, and the second rotor core 30 is prevented from being rotated in a circumferential direction relatively to the presser base 80. The rotary shaft 6 is then successively press-fitted and fixed into both through-holes of the first and second rotor cores 20 and 30.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a method for manufacturing a Landell rotor.

  In a motor rotor, field magnets are arranged between first and second rotor cores each having a plurality of claw-shaped magnetic poles in the circumferential direction, and the claw-shaped magnetic poles of the first and second rotor cores are alternately different magnetic poles. There is known a Landell type rotor that functions in a conventional manner (Patent Document 1). The Landel rotor of Patent Document 1 includes an annular rectifier magnet having a back magnet portion on the back surface of each claw-shaped magnetic pole portion and an inter-pole magnet portion between each claw-shaped magnetic pole portion adjacent in the circumferential direction. .

  Then, in a state where the field magnet and the rectifying magnet are assembled between the first and second rotor cores, the rotating shaft is passed through from the through hole of the first rotor core toward the through hole of the second rotor core. At this time, the rotating shaft is pressed into the through holes of the first and second rotor cores to penetrate. As a result, the rotating shaft is fixed integrally with the first and second rotor cores, and the field magnet and the rectifying magnet are disposed between the first rotor core and the second rotor core to manufacture the Landel rotor.

JP 2013-212036 A

  By the way, in the manufacture of the above-mentioned Landell type rotor, when the rotary shaft is penetrated from the through hole of the first rotor core toward the through hole of the second rotor core, the rotary shaft is press-fitted and penetrated into both through holes. It was. Therefore, for example, when the rotating shaft is press-fitted into the through hole of the first rotor core, the force is transmitted to the core base of the first rotor core during the press-fitting, and the force rotates the first rotor core around the central axis of the rotating shaft. Move. As a result, the first rotor core rotates relative to the second rotor core.

  When the first rotor core rotates relative to the second rotor core, the interpolar magnet portions disposed between the claw-shaped magnetic pole portions adjacent to each other in the circumferential direction of the annular rectifier magnet are compressed by the adjacent claw-shaped magnetic pole portions. Receive the power to be. As a result, the interpolar magnet portion of the annular rectifying magnet may be damaged by the compressive force.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a method for manufacturing a Landel rotor that does not damage the interpolar magnet portion of the rectifying magnet when the rotary shaft is press-fitted into the rotor. There is.

  In the manufacturing method of the Landell type rotor for solving the above-described problems, through holes for press-fitting the rotary shaft are formed at the center position, and the outer peripheral portions are radially extended and then bent in the axial direction. In addition, a plurality of claw-shaped magnetic pole portions are alternately arranged in the circumferential direction, and a through hole that penetrates the rotating shaft is formed at the center position, and is magnetized along the axial direction. A field magnet that causes each claw-shaped magnetic pole portion of the first rotor core and each magnetic pole portion of the second rotor core to function as different magnetic poles, and a back surface that is arranged on the back surface of each claw-shaped magnetic pole portion and is magnetized in the radial direction A Randel-type rotor manufacturing method comprising a magnet portion and a rectifying magnet having an inter-pole magnet portion disposed between the claw-shaped magnetic pole portions adjacent in the circumferential direction and magnetized in the circumferential direction. , The first and second b A locking portion is provided on the outer surface in the axial direction of the core, and after the field magnet and the rectifying magnet are assembled to the first and second rotor cores, an engaging member is fitted to the locking portion. The first and second rotor cores are not rotated in the circumferential direction, and the rotary shaft is sequentially press-fitted into both through holes of the first and second rotor cores.

According to this configuration, the rotating shaft can be press-fitted without rotating the first and second rotor cores, and there is no possibility of damaging the interpolar magnet portion of the rectifying magnet.
Further, in the above configuration, the locking portion is a locking hole formed on the outer surface in the axial direction of the first and second rotor cores, and the engagement member is one of the first and second rotor cores. It is preferable that the engagement pin is provided on a base that supports the engagement pin, and the engagement pin is provided on a presser base that presses one of the first and second rotor cores toward the base.

  According to this configuration, when the engaging pins provided on the base and the presser base are engaged with the locking holes formed on the axially outer side surfaces of the first and second rotor cores, respectively, The first and second rotor cores are not rotated.

  In the above configuration, a sleeve that penetrates the rotating shaft is inserted inside the through hole of the field magnet, and the axial length of the sleeve is the length in the axial direction of the field magnet. Longer than this is preferable.

  According to this configuration, in a state where the axially outer surfaces of the first and second rotor cores are pressed by the base and the presser base, one of the first and second rotor cores includes the base and one end surface of the sleeve. The other one of the first and second rotor cores is sandwiched between the presser base and the other end surface of the sleeve. Therefore, when the rotary shaft is press-fitted, the field magnet is not subjected to the pressing force by the base and the presser base, so there is no possibility of damaging the field magnet.

  Further, in the above configuration, it is preferable that an annular boss portion is formed in each of the axially outer openings of the through holes of the first and second rotor cores so as to face the sleeve on an extension line thereof.

  According to this configuration, when pressing the axially outer side surfaces of the first and second rotor cores with the base and the presser base, the base and the presser base are respectively in the axial direction of the first and second rotor cores other than the boss portion. Do not touch the outside surface. As a result, when the rotary shaft is press-fitted, the field magnet can be reliably protected without being damaged.

  In the above configuration, when the rotary shaft is sequentially press-fitted into the through holes of the first and second rotor cores, the rotary shaft is press-fitted after the center positioning shaft is inserted into the through holes and positioned. It is preferable.

  According to this configuration, the center positioning shaft is inserted into the through holes of the first and second rotor cores, so that the center positions of the first and second rotor cores are aligned. As a result, the rotation shaft is securely press-fitted and fixed without the first and second rotor cores being displaced.

  According to the present invention, the interpole magnet portion of the rectifying magnet is not damaged when the rotating shaft is press-fitted into the rotor.

Sectional drawing of the brushless motor explaining embodiment. Similarly, the exploded perspective view of a brushless motor. Similarly, the exploded perspective view of a rotor. Similarly, the exploded perspective view of a rotor and a rotating shaft. Similarly, the perspective view of a rotor. Similarly, it is a figure explaining the manufacturing method of a rotor, Comprising: Sectional drawing which shows the state which supported the rotor before press-fitting a rotating shaft with the base and the pressing stand. Similarly, sectional drawing which shows the state which press-fitted the rotating shaft to the rotor supported with the base and the press stand.

First, an embodiment of a motor having a Landel rotor will be described.
The brushless motor M of the present embodiment shown in FIG. 1 is a Landell type motor. The brushless motor M is a motor used for a position control device arranged in a vehicle engine room, specifically, a valve timing variable device connected to the engine.

  The brushless motor M has a motor case 1. The motor case 1 has a cylindrical front housing 2 made of a magnetic material formed in a covered cylindrical shape, and an end frame 3 made of aluminum (nonmagnetic material) that closes the opening of the cylindrical front housing 2. ing.

  In the brushless motor M, a stator 5 is fixed to the inner peripheral surface of the cylindrical front housing 2, and a rotor 7 having a so-called Landel type structure that is fixed to the rotating shaft 6 and rotates integrally with the rotating shaft 6 inside the stator 5. Is arranged. The rotating shaft 6 is a non-magnetic stainless steel shaft that is housed and fixed in a bearing 8 that is housed and fixed in a bearing holder 2 a formed in the cylindrical front housing 2 and a bearing holder 3 a that is formed in the end frame 3. The bearing 9 supports the motor case 1 so as to be rotatable. The bearings 8 and 9 are made of a nonmagnetic material.

  The tip of the rotating shaft 6 protrudes from the cylindrical front housing 2. The valve timing (the relative rotational phase of the camshaft with respect to the crankshaft of the engine) is appropriately changed by the rotational driving of the rotating shaft 6.

(Stator 5)
As shown in FIGS. 1 and 2, a stator 5 is fixed to the inner peripheral surface of the cylindrical front housing 2. The stator 5 has a cylindrical stator core 11, and the outer peripheral surface of the stator core 11 is fixed to the inner side surface of the cylindrical front housing 2.

  Inside the stator core 11, a plurality of teeth 12 formed along the axial direction and arranged at equal pitches in the circumferential direction are formed extending inward in the radial direction. Each tooth 12 is a T-shaped tooth, and the inner circumferential surface in the radial direction is an arc surface obtained by extending a concentric arc in the axial direction around the central axis O of the rotating shaft 6.

  Each of the teeth 12 is wound with three-phase windings via an insulator 13 (see FIG. 1). Specifically, as shown in FIG. 2, the 12 teeth 12 have three-phase windings in the circumferential direction, that is, a U-phase winding 14, a V-phase winding 15, and a W-phase winding 16 concentrated in order. It is wound by winding.

  Then, a three-phase drive current is supplied to the wound windings 14, 15, 16 to form a rotating magnetic field in the stator 5, and the rotor 7 fixed to the rotating shaft 6 disposed inside the stator 5 is attached. It is designed to rotate forward and reverse.

(Rotor 7)
As shown in FIGS. 1 to 3, the rotor 7 fixed to the rotating shaft 6 is disposed inside the stator 5. The rotor 7 includes first and second rotor cores 20 and 30, a field magnet 40, and a rectifying magnet 42.

(First rotor core 20)
As shown in FIG. 3, the first rotor core 20 is formed of an electromagnetic steel plate made of a soft magnetic material, and is disposed on the end frame 3 side. The first rotor core 20 has a disk-shaped first core base 21, and a through hole 21 a is formed through the center position thereof. An annular boss portion 21b is formed to protrude from the outer peripheral portion of the through hole 21a on the end frame 3 side. In the present embodiment, the through hole 21a and the boss portion 21b are formed simultaneously by burring. The outer diameter of the boss portion 21b is shorter than the outer diameter of the bearing 9 that rotatably supports one side of the rotating shaft 6, that is, the inner diameter of the bearing holding portion 3a that accommodates and fixes the bearing 9 provided with the end frame 3. Has been.

  The rotary shaft 6 is press-fitted into the through hole 21a (boss portion 21b), and the first core base 21 is fixed to the rotary shaft 6 by pressure. At this time, the first core base 21 is firmly crimped and fixed to the rotating shaft 6 by forming the boss portion 21b. When the first core base 21 is crimped and fixed to the rotary shaft 6, the boss portion 21b is arranged so as to be separated from the bearing 9 accommodated and fixed in the bearing holding portion 3a in the axial direction. (See FIG. 1).

  On the outer peripheral surface 21c of the first core base 21, a plurality of (four in the present embodiment) first claw-shaped magnetic poles 22 project radially outward and extend in the axial direction at equal intervals. Here, in the first claw-shaped magnetic pole 22, a portion protruding radially outward from the outer peripheral surface 21 c of the first core base 21 is referred to as a first base portion 23, and a tip portion bent in the axial direction is the first magnetic pole portion 24. That's it.

  The circumferential end surfaces 22a and 22b of the first claw-shaped magnetic pole 22 composed of the first base portion 23 and the first magnetic pole portion 24 extend in the radial direction (not inclined with respect to the radial direction when viewed from the axial direction). It has become. The circumferential angle of each first claw-shaped magnetic pole 22, that is, the angle between the circumferential end surfaces 22 a and 22 b is set smaller than the angle of the gap between the first claw-shaped magnetic poles 22 adjacent in the circumferential direction. Yes.

  Further, the radially outer surface 25 of the first magnetic pole portion 24 has a concentric circular arc surface whose axial orthogonal cross-sectional shape is centered on the central axis O of the rotating shaft 6, and two radially outer surfaces 25 are provided on the radially outer surface 25. An auxiliary groove 26 is provided. The auxiliary grooves 26 are formed at positions shifted by the same angle on both sides from the circumferential center of the radially outer surface 25. The auxiliary groove 26 has a U-shaped cross section in the direction perpendicular to the axis, that is, a bottom surface that is a curved surface.

In addition, four first locking holes 27 are formed through the outer surface 21e of the disc-shaped first core base 21 on the end frame 3 side at equal angular intervals (90 degrees) about the central axis O. Has been.
(Second rotor core 30)
As shown in FIG. 3, the second rotor core 30 has the same material and the same shape as the first rotor core 20, and is disposed on the cylindrical front housing 2 side. The second rotor core 30 has a disk-shaped second core base 31, and a through hole 31 a is formed through the center of the second rotor core 30. An annular boss portion 31b is formed to protrude from the outer peripheral portion of the through hole 31a on the cylindrical front housing 2 side. In the present embodiment, the through hole 31a and the boss portion 31b are formed simultaneously by burring. The outer diameter of the boss portion 31b is larger than the outer diameter of the bearing 8 that rotatably supports the other side of the rotating shaft 6, that is, the inner diameter of the bearing holding portion 2a that accommodates and fixes the bearing 8 provided with the cylindrical front housing 2. It is short.

  The rotary shaft 6 is press-fitted and inserted into the through hole 31a (boss portion 31b), and the second core base 31 is fixed to the rotary shaft 6 by pressure. At this time, by forming the boss portion 31 b, the second core base 31 is firmly pressure-bonded to the rotating shaft 6. When the second core base 31 is pressure-bonded and fixed to the rotary shaft 6, the boss portion 31b is arranged so as to be separated from the bearing 8 accommodated and fixed in the bearing holding portion 2a in the axial direction. (See FIG. 1).

  On the outer peripheral surface 31c of the second core base 31, a plurality of (four in the present embodiment) second claw-shaped magnetic poles 32 project outward in the radial direction and extend in the axial direction at equal intervals. Here, in the second claw-shaped magnetic pole 32, a portion that protrudes radially outward from the outer peripheral surface 31 c of the second core base 31 is referred to as a second base portion 33, and a tip portion bent in the axial direction is the second magnetic pole portion 34. That's it.

  Both end surfaces 32a and 32b in the circumferential direction of the second claw-shaped magnetic pole 32 composed of the second base portion 33 and the second magnetic pole portion 34 are flat surfaces extending in the radial direction. The circumferential angle of each of the second claw-shaped magnetic poles 32, that is, the angle between the circumferential end surfaces 32a and 32b is set smaller than the angle of the gap between the second claw-shaped magnetic poles 32 adjacent in the circumferential direction. Yes.

  Further, the radially outer surface 35 of the second magnetic pole portion 34 has a concentric circular arc surface with the axial orthogonal cross-sectional shape centering on the central axis O of the rotating shaft 6, and two radially outer surfaces 35 are arranged on the radially outer surface 35. An auxiliary groove 36 is provided. The auxiliary grooves 36 are formed at positions shifted by the same angle on both sides from the circumferential center of the radially outer surface 35. The auxiliary groove 36 has a U-shaped cross section in the direction perpendicular to the axis, that is, a bottom surface formed of a curved surface.

  Further, on the outer surface 31e of the disk-shaped second core base 31 on the cylindrical front housing 2 side, four second locking holes 37 are spaced at equal angles (90 degrees) about the central axis O. It is formed through.

  The second rotor core 30 is combined so as to face the first rotor core 20 so that the second claw-shaped magnetic poles 32 are located between the first claw-shaped magnetic poles 22 of the first rotor core 20. At this time, the field magnet 40 is interposed between the inner side surface 31d of the second core base 31 and the inner side surface 21d of the first core base 21 in the axial direction.

(Field magnet 40)
As shown in FIG. 3, the field magnet 40 is a disk-shaped permanent magnet, and a through hole 40a is formed at the center thereof. The field magnet 40 has a cylindrical sleeve 41 inserted through the through hole 40a. The sleeve 41 is made of a non-magnetic material and is made of the same stainless steel as the rotary shaft 6 in this embodiment. The outer diameter of the field magnet 40 is set to coincide with the outer diameters of the first and second core bases 21 and 31. Therefore, the outer peripheral surface 40 b of the field magnet 40 is flush with the outer peripheral surfaces 21 c and 31 c of the first and second core bases 21 and 31.

  The inner diameter of the sleeve 41 inserted through the through hole 40 a of the field magnet 40 is set to an inner diameter through which the rotary shaft 6 penetrates the sleeve 41 so as to be rotatable. The length of the sleeve 41 in the axial direction is slightly longer than the length of the field magnet 40 in the axial direction.

  The field magnet 40 is magnetized in the axial direction, and is magnetized so that the first rotor core 20 side is an N pole and the second rotor core 30 side is an S pole. Therefore, by this field magnet 40, the first claw-shaped magnetic pole 22 of the first rotor core 20 functions as an N pole, and the second claw-shaped magnetic pole 32 of the second rotor core 30 functions as an S pole.

  Therefore, the rotor 7 of the present embodiment is a so-called Landel type rotor using the field magnet 40. In the rotor 7, first claw-shaped magnetic poles 22 that are N poles and second claw-shaped magnetic poles 32 that are S poles are alternately arranged in the circumferential direction, and the number of magnetic poles is eight. That is, in the brushless motor M of this embodiment, the number of poles of the rotor 7 is set to 2 × n (where n is a natural number), and the number of teeth 12 of the stator 5 is set to 3 × n. The number of poles of the rotor 7 is set to “8”, and the number of teeth 12 of the stator 5 is set to “12”.

(Rectifier magnet 42)
As shown in FIG. 3, the rotor 7 includes an annular rectifier magnet 42 on the outer peripheral side of the field magnet 40. The field magnet 40 and the rectifying magnet 42 are made of different materials. Specifically, the field magnet 40 is, for example, an anisotropic sintered magnet, and is composed of, for example, a ferrite magnet, a samarium cobalt (SmCo) magnet, a neodymium magnet, or the like. The rectifying magnet 42 is, for example, a bond magnet (plastic magnet, rubber magnet, etc.), and is composed of, for example, a ferrite magnet, a samarium iron nitrogen (SmFeN) magnet, a samarium cobalt (SmCo) magnet, a neodymium magnet, or the like.

  As shown in FIG. 3, the rectifying magnet 42 includes first and second back magnet parts 43 and 44 and an interpole magnet part 45, and the first and second back magnet parts 43 and 44 and the interpoles. Each of the magnet portions 45 is a polar anisotropic magnet that is magnetized so as to suppress the leakage magnetic flux.

  Specifically, the first back magnet portion 43 is disposed between the inner peripheral surface of the first magnetic pole portion 24 of the first claw-shaped magnetic pole 22 and the outer peripheral surface 31 c of the second core base 31. The first back magnet part 43 has a side in contact with the inner peripheral surface of the first magnetic pole part 24 at the N pole having the same polarity as the first magnetic pole part 24 and a side in contact with the outer peripheral face 31c of the second core base 31. The radial component is mainly magnetized so as to be the S pole having the same polarity as the second core base 31.

  The second back magnet part 44 is disposed between the inner peripheral surface of the second magnetic pole part 34 of the second claw-shaped magnetic pole 32 and the outer peripheral surface 21 c of the first core base 21. The second back magnet part 44 has a side in contact with the inner peripheral surface of the second magnetic pole part 34 on the S pole having the same polarity as the second magnetic pole part 34 and a side in contact with the outer peripheral surface 21c of the first core base 21. The radial component is mainly magnetized so as to be an N pole having the same polarity as the first core base 21.

  The interpolar magnet portion 45 is disposed between the first claw-shaped magnetic pole 22 and the second claw-shaped magnetic pole 32 in the circumferential direction. The interpolar magnet unit 45 is mainly magnetized in the circumferential direction so that the first claw-shaped magnetic pole 22 side becomes the N pole and the second claw-shaped magnetic pole 32 side becomes the S pole in the circumferential direction.

  As described above, the rotor 7 including the first and second rotor cores 20 and 30, the field magnet 40, and the rectifying magnet 42 has an annular sensor magnet 50 on the end face on the end frame 3 side, as shown in FIG. Is directly fixed with an adhesive.

  The annular sensor magnet 50 is magnetized in the circumferential direction. In this embodiment, the sensor magnet 50 is magnetized so as to have the same number of magnetic poles as the number of magnetic poles of the rotor 7. When the sensor magnet 50 is fixed to the rotor 7, the magnetic pole of the sensor magnet 50 is fixed so that the magnetic poles of the rotor 7 correspond to the first and second claw-shaped magnetic poles 22 and 32.

  The sensor magnet 50 is magnetically detected by a magnetic sensor 60 such as a Hall IC provided on the axially inner side surface 3 b of the end frame 3. That is, the magnetic sensor 60 outputs a detection signal corresponding to the magnetic pole of the sensor magnet 50 that rotates integrally with the rotor 7 that passes on the opposite surface. A control circuit (not shown) that receives the detection signal from the magnetic sensor 60 calculates the rotational position (angle) of the rotor 7 and the rotational speed (speed) based on the detection signal, and drives the brushless motor M. Take control.

  Next, as shown in FIG. 4, the rotating shaft 6 is rotated with respect to the rotor 7 in a state where the field magnet 40 and the rectifying magnet 42 in which the sleeve 41 is inserted between the first and second rotor cores 20 and 30 are assembled. A method for completing the rotor 7 shown in FIG.

  As shown in FIGS. 6 and 7, first, in manufacturing, the base 70 on which the rotor 7 is placed, and the first and second rotor cores 20 when the rotary shaft 6 is press-fitted in cooperation with the base 70. , 30 and a movable body 90 for press-fitting the rotary shaft 6 into the rotor 7 are used.

  6 and 7, the second locking hole 37 of the second core base 31 corresponding to the first locking hole 27 of the first core base 21 is shifted by 45 degrees in the circumferential direction. Although not shown in FIG. 7, the second locking hole 37 is shown in FIGS. 6 and 7 for easy understanding of the description.

(Base 70)
As shown in FIG. 6, the rotor 7 in a state in which the field magnet 40 and the rectifying magnet 42 are assembled between the first and second rotor cores 20 and 30 before the rotary shaft 6 is press-fitted is mounted on the base 70. Placed on. At this time, the first rotor core 20 is placed so as to face the base 70.

  The base 70 is a cylindrical body that is supported and fixed so that it cannot rotate and cannot move in the axial direction. The outer diameter of the base 70 made of the cylindrical body is the outer diameter of the first core base 21 of the first rotor core 20. It is formed slightly larger. The end portion on the side on which the rotor 7 is placed is tapered and chamfered so that its outer diameter is reduced to be slightly smaller than the outer diameter of the first core base 21 of the first rotor core 20. The end surface 71 on the side on which the rotor 7 is placed is a circular plane.

  The end surface 71 on the side where the rotor 7 is placed is provided with a boss receiving recess 72 in a circular shape concentric with the end surface 71, and the bottom surface of the boss receiving recess 72 is used as a load receiving surface 73. The inner diameter of the boss accommodating recess 72 is formed larger than the outer diameter of the boss portion 21 b formed in the first core base 21. The depth of the boss accommodating recess 72 is formed to be shorter than the axial length of the boss portion 21b (the length from the outer surface 21e of the first core base 21 in the axial direction to the distal end surface of the boss portion 21b in the axial direction). Has been.

  That is, when the rotor 7 is placed on the base 70 so that the boss portion 21 b formed on the first core base 21 is disposed in the boss accommodating recess 72, the end surface 71 of the base 70 and the first core base 21 A gap is formed between the outer surface 21e and the outer surface 21e. More specifically, the first core base 21 is arranged in a state of floating from the end surface 71 of the base 70.

  A circular large-diameter through hole 74 is recessed in the axial direction at the center of the load receiving surface 73 of the boss receiving recess 72 provided in the end surface 71 of the base 70. The inner diameter of the large-diameter through-hole 74 is set to an inner diameter through which the rotary shaft 6 is inserted without being shaken. The boss portion 21 b formed on the first core base 21 is brought into contact with the annular opening portion around the large-diameter through hole 74 on the load receiving surface 73. As shown in FIG. 5, the depth of the large-diameter through hole 74 is from the boss portion 21b formed when the rotary shaft 6 protrudes from the boss portion 21b formed on the first core base 21 to the protruding tip of the rotary shaft 6. Is to the length of.

  Furthermore, a circular small-diameter through hole 75 is formed at the center of the bottom surface of the large-diameter through hole 74 so as to penetrate the base 70 in the axial direction. The small-diameter through hole 75 communicates with the large-diameter through-hole 74 so that the center axis thereof coincides with the central axis of the large-diameter through-hole 74, and the center positioning guide shaft 77 is inserted so as to be movable in the axial direction.

  The inner diameter of the small diameter through hole 75 through which the center positioning guide shaft 77 is inserted is smaller than the inner diameter of the large diameter through hole 74, and the through holes 21a of the first and second core bases 21 and 31 before the rotary shaft 6 is press-fitted. , 31a (boss portions 21b, 31b) is set to an inner diameter through which the center positioning guide shaft 77 is inserted without being displaced.

  Accordingly, the center positioning guide shaft 77 inserted into the small diameter through hole 75 from the bottom surface of the base 70 passes through the large diameter through hole 74 and the through hole 21a (boss portion 21b) of the first core base 21 → field. Through the sleeve 41 of the magnet 40, the second core base 31 is inserted into the through hole 31a (boss portion 31b).

The tip 78 of the center positioning guide shaft 77 is generated in a tapered shape, and the tapered tip 78 is located on the center axis.
Four first engagement pins 79 project from the end surface 71 of the outer peripheral portion of the boss receiving recess 72 provided in the base 70. The four first engaging pins 79 are respectively fitted into the four first locking holes 27 formed through the outer surface 21e of the first core base 21 when the rotor 7 is placed on the base 70. Match.

  That is, when the rotor 7 is placed on the base 70 so that each first locking hole 27 of the first core base 21 is fitted to the first engagement pin 79, the boss formed on the first core base 21 is formed. The part 21 b is disposed in the boss receiving recess 72. At this time, the center axis O of the rotor 7 coincides with the center axes of the large diameter through hole 74 and the small diameter through hole 75 formed in the base 70. Further, when the first engagement pin 79 is fitted into the first locking hole 27, the first core base 21 (first rotor core 20) cannot rotate about the central axis O with respect to the base 70. Supported.

(Presser stand 80)
As shown in FIG. 6, when the rotor 7 is placed on the base 70 and the first core base 21 (first rotor core 20) is supported so as not to rotate with respect to the base 70, the presser base 80 becomes the second rotor core. 30 on the upper side.

  The presser base 80 is a cylindrical body that is supported and fixed in a non-rotatable manner, and the outer diameter of the presser base 80 made of the cylindrical body is formed larger than the outer diameter of the second core base 31 of the second rotor core 30. . The upper surface 81 and the lower surface 82 of the presser base 80 are circular planes.

  A housing recess 83 is formed in a circular shape concentric with the upper surface 81 on the upper surface 81 of the presser base 80, and the inner diameter of the housing recess 83 is that of the movable body 90 that press-fits the rotor 7 by moving the rotary shaft 6 downward. It is formed larger than the outer diameter of the grip portion 91. The depth of the housing recess 83 is formed shallower (shorter) than the axial length of the grip portion 91.

  On the other hand, a boss accommodating recess 84 is formed in a circular shape concentric with the lower surface 82 on the lower surface 82 of the presser base 80, and the inner surface of the boss accommodating recess 84 is a load receiving surface 85. The inner diameter of the boss housing recess 84 is formed larger than the outer diameter of the boss part 31 b formed in the second core base 31. The depth of the boss receiving recess 84 is shorter than the axial length of the boss portion 31b (the length from the outer surface 31e of the second core base 31 in the axial direction to the distal end surface of the boss portion 31b in the axial direction). Has been.

  That is, when the presser base 80 is placed on the upper side of the second rotor core 30 so that the boss portion 31b formed on the second core base 31 is disposed in the boss receiving recess 84, the lower surface 82 of the presser base 80 and the second core. A gap is formed between the base 31 and the outer surface 31e. More specifically, the presser base 80 is disposed in a state of floating from the outer side surface 31 e of the second core base 31.

  A circular guide through hole 86 is formed at the center of the load receiving surface 85 of the boss receiving recess 84 so as to penetrate the bottom surface of the receiving recess 83 in the axial direction. The inner diameter of the guide through-hole 86 is the same as the inner diameter of the large-diameter through-hole 74 formed in the base 70, and the rotary shaft 6 is inserted without being displaced. The central axis of the guide through-hole 86 coincides with the central axis O of the rotor 7 when the presser base 80 presses the second core base 31.

  Four second engagement pins 87 project from the lower surface 82 of the outer peripheral portion of the boss receiving recess 84 formed in the holding table 80. When the presser base 80 is arranged so that the boss receiving recess 84 formed in the presser base 80 contacts the boss part 31 b of the second core base 31, the second engagement pin 87 is arranged on the outer side surface 31 e of the second core base 31. Are fitted into the four second locking holes 37 that are formed so as to penetrate therethrough.

  That is, when the presser base 80 is disposed on the rotor 7 so that each second locking hole 37 of the second core base 31 is fitted to the second engagement pin 87, the boss portion of the second core base 31 is provided. Reference numeral 31 b denotes a load receiving surface 85 of the boss accommodating recess 84, which abuts on an annular opening around the guide through hole 86.

  At this time, the central axis of the guide through hole 86 coincides with the central axis O of the rotor 7. Further, when the second engagement pin 87 is fitted into the second locking hole 37, the second core base 31 (second rotor core 30) cannot rotate about the central axis O with respect to the presser base 80. Supported.

(Movable body 90)
A movable body 90 is disposed above the presser base 80 disposed so as to contact the boss portion 31 b of the second core base 31. The movable body 90 is reciprocated in the vertical direction by a driving member (not shown). A grip 91 is provided below the movable body 90 (on the holding stand 80 side).

  The grip portion 91 is formed with a shaft mounting hole 92 having an opening on the lower side (presser base 80 side), and the rotation shaft 6 is inserted into the shaft mounting hole 92 without running out. When the rotary shaft 6 abuts to the inner surface (pressure surface 93) of the shaft mounting hole 92, the center positioning pins 94 formed at the center position of the pressure surface 93 of the shaft mounting hole 92 are recessed at the center positions of the upper and lower end surfaces of the rotary shaft 6. It fits with one (upper side) shaft hole 6a of the provided shaft hole 6a. As a result, the central axis O of the rotating shaft 6 inserted into the shaft mounting hole 92 of the grip portion 91 matches the central axis of the guide through hole 86 of the presser base 80.

  In the rotary shaft 6, a pin through-hole 6 b that is orthogonal to the central axis O and penetrates the central axis O is formed at the end of the rotary shaft 6 that is inserted into the shaft mounting hole 92. The pin through hole 6 b communicates with a pin insertion hole (not shown) formed in the grip portion 91 when the rotary shaft 6 is inserted up to the pressure surface 93 of the shaft mounting hole 92. Then, by inserting the latch pin 95 into the pin through hole 6b and the pin insertion hole (not shown) that communicate with each other, the rotation shaft 6 is prevented from coming out downward and turning about the central axis O. Yes.

Next, a method of press-fitting and fixing the rotary shaft 6 to the rotor 7 using the base 70, the presser base 80, and the movable body 90 will be described.
Now, the rotor 7 before press-fitting the rotating shaft 6 is placed on the base 70. At this time, the rotor 7 is placed so that the first engagement pins 79 are fitted in the respective first locking holes 27 of the first core base 21. As a result, the rotor 7 is positioned with respect to the base 70 with the boss portion 21 b of the first core base 21 disposed in the boss accommodating recess 72.

  That is, the central axis O of the rotor 7 coincides with the central axes of the large diameter through hole 74 and the small diameter through hole 75 formed in the base 70. The first rotor core 20 of the rotor 7 is supported so as not to rotate about the central axis O with respect to the base 70 by fitting the first engagement pins 79 into the first locking holes 27. .

  Further, since the boss portion 21 b formed on the first core base 21 contacts the load receiving surface 73, the rotor 7 has a gap between the outer surface 21 e of the first core base 21 and the end surface 71 of the base 70. Are arranged as follows.

  Next, when the rotor 7 is placed on the base 70, the presser base 80 is disposed on the upper side of the second rotor core 30 of the rotor 7 from above and lightly pressed. At this time, the presser base 80 is disposed on the upper side of the rotor 7 so that the second engagement pins 87 are fitted in the respective second locking holes 37 of the second core base 31. As a result, the presser base 80 positions the rotor 7 by the load receiving surface 85 of the boss receiving recess 84 pressing the boss portion 31 b of the second core base 31.

  That is, the central axis of the guide through hole 86 provided in the presser base 80 coincides with the central axis O of the rotor 7. The second rotor core 30 of the rotor 7 is supported so as not to rotate about the central axis O with respect to the base 70 by fitting the second engagement pin 87 into the second locking hole 37. .

  Further, since the boss portion 31 b formed on the second core base 31 abuts against the load receiving surface 85 of the boss receiving recess 84, the rotor 7 is formed between the outer surface 31 e of the second core base 31 and the lower surface 82 of the presser base 80. It arrange | positions so that a clearance gap may arise between them.

  Next, the center positioning guide shaft 77 inserted through the small-diameter through hole 75 of the base 70 is moved up in the axial direction to the inside of the housing recess 83 of the presser base 80 by a moving device (not shown). That is, the center positioning guide shaft 77 passes through the rotor 7 positioned by the base 70 and the presser base 80, and further passes through the guide through hole 86 of the presser base 80 and is guided into the accommodating recess 83.

  Next, when the center positioning guide shaft 77 is guided into the housing recess 83, the movable body 90 that grips the rotating shaft 6 is moved downward in the axial direction by the grip portion 91. As the movable body 90 moves downward, the distal end portion of the rotating shaft 6 is guided into the housing recess 83 of the presser base 80 toward the center positioning guide shaft 77 that has been previously guided.

  Then, the tip end portion 78 of the center positioning guide shaft 77 is fitted into the shaft hole 6a formed in the lower end surface of the rotating shaft 6, and further, the rotating shaft 6 moves the center positioning guide shaft 77 along with the downward movement of the movable body 90. Move down while pressing. At this time, since the tip 78 of the center positioning guide shaft 77 is fitted in the shaft hole 6a of the rotating shaft 6, the rotating shaft 6 has a center axis O of the center positioning guide shaft 77, that is, a rotor. 7 moves down in line with the central axis of 7.

  The movable body 90 further moves downward to press-fit the rotating shaft 6 into the rotor 7 supported by the base 70 and the presser base 80. That is, the rotating shaft 6 presses the through hole 31a (boss portion 31b) of the second rotor core 30 and the through hole 21a (boss portion 21b) of the first rotor core 20 and moves downward.

  At this time, since the second engagement pin 87 of the presser base 80 is fitted in the second locking hole 37 of the second rotor core 30, the second core base 31 (second rotor core 30 is being pressed during the press-fitting of the rotary shaft 6. ) Does not rotate around the central axis O with respect to the presser base 80. Similarly, since the first engagement pin 79 of the base 70 is fitted in the first locking hole 27 of the first rotor core 20, the first core base 21 (the first rotor core 20 is pressed during the press-fitting of the rotary shaft 6. ) Does not rotate around the central axis O with respect to the base 70.

  Accordingly, since the first rotor core 20 and the second rotor core 30 do not rotate relative to each other, the interpolar magnet portion 45 disposed between the claw-shaped magnetic poles 22 and 32 adjacent to each other in the circumferential direction of the annular rectifying magnet 42 It does not receive the force compressed by the matching claw-shaped magnetic poles 22 and 32. As a result, there is no possibility that the interpolar magnet portion 45 of the rectifying magnet 42 is damaged when the rotary shaft 6 is press-fitted.

  Further, the axial length of the sleeve 41 inserted inside the through hole 40 a of the field magnet 40 is longer than the axial length of the field magnet 40. Therefore, the outer surfaces 21e and 31e (boss portions 21b and 31b) of the first and second core bases 21 and 31 are pressed by the base 70 and the presser base 80 during the press-fitting, but the first and second core bases are pressed. The inner surfaces 21 d and 31 d of the 21 and 31 are held at intervals by the sleeve 41. Thereby, when the rotary shaft 6 is press-fitted, the field magnet 40 is not applied with the pressing force from the base 70 and the presser base 80, so that there is no possibility of damaging the field magnet 40.

  Moreover, the boss portions 21b and 31b are formed on the extension lines in the axial direction of the sleeve 41 so as to face the outer surfaces 21e and 31e of the first and second core bases 21 and 31, respectively. That is, the base 70 and the presser base 80 do not contact the outer surfaces 21e, 31e of the first and second core bases 21, 31 other than the boss portions 21b, 31b, respectively. As a result, when the rotary shaft 6 is press-fitted, the field magnet 40 can be reliably protected without being damaged.

  Eventually, as shown in FIG. 7, when the lower end surface of the rotating shaft 6 reaches the bottom surface of the large-diameter through hole 74 of the base 70, the movable body 90 stops moving downward and finishes the press-fitting of the rotating shaft 6. To do. Then, in a stopped state, the latch pin 95 is removed from the grip portion 91 of the movable body 90, and then the movable body 90 is moved up to the original position.

Thereby, the rotor in which the rotary shaft 6 shown in FIG. 5 is press-fitted and fixed is completed.
Next, the effect of the said embodiment is described below.
(1) According to the present embodiment, when the rotary shaft 6 is press-fitted, the first rotor core 20 and the second rotor core 30 are not rotated relative to each other. , 32 does not receive the force compressed by the adjacent claw-shaped magnetic poles 22, 32. As a result, there is no possibility that the interpolar magnet portion 45 of the rectifying magnet 42 is damaged when the rotary shaft 6 is press-fitted.

  (2) According to this embodiment, the axial length of the sleeve 41 is formed longer than the axial length of the field magnet 40, and the inner side surfaces 21 d and 31 d of the first and second core bases 21 and 31 are formed. The gap is held by the sleeve 41. Thus, when the rotary shaft 6 is press-fitted, the field magnet 40 is not damaged by the pressing force from the base 70 and the presser base 80 being applied.

  (3) According to the present embodiment, the boss portions 21 b and 31 b are formed on the extension line in the axial direction of the sleeve 41 so as to face the outer surfaces 21 e and 31 e of the first and second core bases 21 and 31. Accordingly, since the base 70 and the presser base 80 do not contact the outer surfaces 21e and 31e of the first and second core bases 21 and 31 other than the boss portions 21b and 31b, respectively, the field magnet 40 is press-fitted into the rotary shaft 6. Sometimes it can be reliably protected without being damaged.

  (4) According to this embodiment, at the time of press-fitting, the tip end portion 78 of the center positioning guide shaft 77 is fitted into the shaft hole 6a formed in the lower end surface of the rotary shaft 6. Then, the rotary shaft 6 starts the press-fitting operation while pushing the center positioning guide shaft 77. Therefore, since the center positions of the first and second rotor cores 20 and 30 are aligned, the rotary shaft 6 can be press-fitted and fixed reliably and smoothly without the first and second rotor cores 20 and 30 being displaced. it can.

The above embodiment may be modified as follows.
In the above embodiment, four first and second locking holes 27, 37 are formed, but other numbers may be used.

  In the above embodiment, the first and second locking holes 27 and 37 as the locking portions are through-holes penetrating the first and second core bases 21 and 31, but the first and second cores A recess may be formed in the outer surfaces 21e and 31e of the bases 21 and 31, and the recess may be used as a locking portion. The engaging portion may be a protrusion, and the engaging member may be a recess that fits into the protrusion. In short, any shape that does not relatively rotate the first and second rotor cores 20 and 30 is acceptable.

  DESCRIPTION OF SYMBOLS 1 ... Motor case, 2 ... Cylindrical front housing, 2a ... Bearing holding part, 3 ... End frame, 3a ... Bearing holding part, 5 ... Stator, 6 ... Rotating shaft, 6a ... Shaft hole, 6b ... Pin through-hole, 7 ... Rotor, 8, 9 ... Bearing, 11 ... Stator core, 12 ... Teeth, 13 ... Insulator, 14 ... U phase winding, 15 ... V phase winding, 16 ... W phase winding, 20 ... First rotor core, 21 ... First core base, 21a ... through hole, 21b ... boss portion, 21c ... outer peripheral surface, 21d ... inner side surface, 21e ... outer side surface, 22 ... first claw-shaped magnetic poles, 22a, 22b ... circumferential end surfaces, 23 ... first DESCRIPTION OF SYMBOLS 1 base part, 24 ... 1st magnetic pole part, 25 ... Radial outer side surface, 26 ... Auxiliary groove, 27 ... 1st locking hole (locking part), 30 ... 2nd rotor core, 31 ... 2nd core base, 31a ... Through hole, 31b ... boss portion, 31c ... outer peripheral surface, 31d ... inner side surface 31e: outer surface, 32: second claw-shaped magnetic poles, 32a, 32b ... circumferential end surfaces, 33 ... second base, 34 ... second magnetic pole portion, 35 ... radially outer surface, 36 ... auxiliary groove, 37 ... first 2 locking holes (locking portions), 40 ... field magnets, 40a ... through holes, 40b ... outer peripheral surface, 41 ... sleeves, 42 ... rectifier magnets, 43, 44 ... first and second back magnet portions, 45 ... Interpole magnet portion, 50 ... sensor magnet, 60 ... magnetic sensor, 70 ... base, 71 ... end face, 72 ... boss receiving recess, 73 ... load receiving surface, 74 ... large diameter through hole, 75 ... small diameter through hole, 76 ... bottom surface, 77 ... center positioning guide shaft (center positioning guide shaft), 78 ... tip portion, 79 ... first engaging pin (engaging member), 80 ... presser base, 81 ... upper surface, 82 ... lower surface, 83 ... accommodating Recess, 84 ... Boss housing recess, 85 ... Load receiving surface, 86 ... Guide through Hole 87, second engagement pin (engagement member), 90, movable body, 91, gripping portion, 92, shaft mounting hole, 93, pressurizing surface, 94, center positioning pin, 95, latch pin, M ... Brushless motor, O ... central axis.

Claims (5)

A through hole for press-fitting the rotary shaft is formed at the center position, and after extending radially in each outer peripheral portion, a plurality of claw-shaped magnetic pole portions bent in the axial direction are alternately arranged in the circumferential direction. First and second rotor cores,
A through hole that penetrates the rotating shaft is formed at a central position, and is magnetized along the axial direction so that the claw-shaped magnetic pole portions of the first rotor core and the magnetic pole portions of the second rotor core are different from each other. Field magnets that function as
An inter-pole magnet portion that is arranged between the claw-shaped magnetic pole portions that are arranged on the back surface of each claw-shaped magnetic pole portion and is magnetized in the radial direction and that is arranged between the claw-shaped magnetic pole portions that are adjacent in the circumferential direction. A method for producing a Landel rotor comprising a rectifying magnet having
A locking portion is provided on the outer surface in the axial direction of the first and second rotor cores,
After assembling the field magnet and the rectifying magnet to the first and second rotor cores,
An engaging member is fitted to the locking portion so that the first and second rotor cores do not rotate in the circumferential direction, and the rotary shaft is sequentially press-fitted into both through holes of the first and second rotor cores. A method for manufacturing a Landel rotor. In the manufacturing method of the Landel type rotor according to claim 1,
The locking portion is a locking hole formed on the outer surface in the axial direction of the first and second rotor cores,
The engaging member includes an engaging pin provided on a base that supports one of the first and second rotor cores, and a pressing member that presses the other of the first and second rotor cores toward the base. A method for manufacturing a Landel rotor, characterized by being an engagement pin provided on a table. In the manufacturing method of the Landel type rotor according to claim 1 or 2,
A sleeve that penetrates the rotating shaft is inserted inside the through hole of the field magnet, and the axial length of the sleeve is longer than the axial length of the field magnet. The manufacturing method of the Landel type rotor. In the manufacturing method of the Landel type rotor according to claim 3,
An annular boss is formed in each of the axially outer openings of the through holes of the first and second rotor cores so as to face the sleeve on the extension line thereof. Method. In the manufacturing method of the Landel type rotor according to any one of claims 1 to 4,
When sequentially press-fitting the rotating shaft into both through holes of the first and second rotor cores,
A method of manufacturing a Landel rotor, wherein a center positioning shaft is inserted into both through holes and positioned, and then a rotary shaft is press-fitted.