JP2008301636A - Motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a motor which can be secured such that no shift arises in the relative positional relation of a pair of yoke. <P>SOLUTION: A first yoke Y1 is provided with a fixing plate 14, and a protrusion 28 is provided to protrude from the distal end face 14d of the fixing plate 14. A second yoke Y2 is provided with a plate 52 for bonding the first yoke Y1 and the second yoke Y2, and a fixing hole 20b penetrating the bonding plate 52 from one side to the other side. Under a state where the protrusion 28 is press-fitted in the fixing hole 20b, the distal end face 14d of the fixing plate 14 abuts against one side of the bonding plate 52 and the distal end of the protrusion 28 projects from the other side of the bonding plate 52. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a motor, and more particularly to a motor in which a stator member is disposed on the outer periphery of a rotor magnet attached to a rotor shaft.

  Conventionally, as a PM type (Permanent Magnet Type) stepping motor using a permanent magnet as a rotor, for example, as shown in FIG. 18, the outer periphery of a plurality of pole teeth 104 erected on the inner periphery of the stator core 102 is coiled. There is known a stepping motor 100 arranged so as to surround 106. In such a stepping motor 100, since the shape of the entire stepping motor 100 is determined by the diameter of the coil 106, there is a limit to downsizing and thinning in order to secure a predetermined number of turns and obtain rotational torque. .

Therefore, as a stepping motor corresponding to a reduction in thickness, a flat type stepping motor in which a pair of square coils are disposed on both sides of a pole tooth group standing upright on the inner periphery of a stator core is known. It has been.

  In such a flat type stepping motor 200, as shown in FIG. 19, a fixed plate 204 is arranged so that a pole tooth group 202 is erected on the inner peripheral edge and is opposed to the pole tooth group 202. Is inserted into the fixed plate 204 and the other yoke 208 provided with the pole teeth group 202 so as to be engaged with the plurality of pole teeth 202 of the one yoke 206. A stator member 212 having a coil 210 fixed between the yoke 206 and the other yoke 208 is provided. A rotor 216 in which a magnet (not shown) is integrally provided on a rotating shaft 214 is rotatably supported via a bearing on the inner periphery of the pole tooth group 202 of the stator members 212 and 212.

In the stepping motor 200 configured as described above, a rotational driving force is applied to the rotor 216 by the interaction between the magnetic field generated by the current flowing through the coil 210 and the magnet, and the rotational output is output from one end side of the rotating shaft 214. The
JP-A-1-99466

  In such a motor, in order to fix the fixing plate 204 of one yoke 206 and the other yoke 208, the fixing plate 204 of one yoke 206 is usually inserted into a through-hole or notch provided in the other yoke 208. The tip is inserted, and the edge of the through hole or notch and the surface of the fixing plate 204 are joined and fixed by welding or the like.

  However, depending on how deep the fixing plate of one yoke is press-fitted into the through hole or notch of the other yoke, there is a relative shift in the positional relationship between the tip of the fixing plate and the through hole or notch. May occur. In such a case, there is a possibility that a failure occurs in the welding between the tip of the fixing plate and the through hole or notch, and a stable strength cannot be obtained. In such a case, there is a problem that the product yield is reduced.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a motor that can be fixed so that a relative positional relationship between a pair of yokes does not shift.

  In order to solve the above-mentioned problems, a motor according to the present invention includes a rotor having a rotor magnet attached to the outer peripheral surface of a rotor shaft, a first yoke, and a second disposed opposite to the first yoke. And a coil disposed between the first yoke and the second yoke, wherein the first yoke has a fixed portion extending in a direction parallel to the rotor shaft. And a protrusion is provided so as to protrude from the front end surface of the fixing portion, and a fixing hole penetrating from one surface facing the first yoke to the other surface is provided in the second yoke. The fixing portion is inserted into the fixing hole of the second yoke, and the fixing portion is inserted into the one surface of the second yoke in a state where the protrusion is press-fitted into the fixing hole. The front end surface of the part abuts, It is an summarized in that the tip of the raised portion projects from the other surface of the second yoke. According to such a configuration, the protrusion provided on the front end of the fixed portion is provided on the joint plate so that the front surface of the fixed portion of the first yoke abuts one surface of the joint plate of the second yoke. The tip of the protrusion protrudes from the other surface of the joining plate in a state of being press-fitted into the fixed hole. Therefore, the depth of press-fitting of the fixing hole into the fixing portion is not too shallow or too deep, and the positional relationship between the fixing portion and the fixing hole can be accurately positioned. It is possible to prevent a deviation from occurring in the relative positional relationship between the first yoke and the second yoke.

  In this case, if the tip of the protrusion is provided with a tapered surface, the protrusion can be smoothly inserted into the fixing hole.

  In addition, the outer peripheral surface of the tip of the projection of the first yoke and the opening edge of the fixing hole of the second yoke are welded to fix the first yoke and the second yoke. This is preferable. When the protrusion provided at the tip of the fixed portion of the first yoke is press-fitted from one surface into the fixing hole provided in the joint plate of the second yoke, the tip of the protrusion protrudes from the other surface of the joint plate. It becomes easy to weld the fixing hole and the protrusion. Therefore, the first yoke and the second yoke can be firmly fixed.

  Further, the frame attached to the second yoke includes an attachment portion fixed in contact with the other surface of the joining plate, and a bearing body that supports one shaft end of the rotor shaft, More preferably, the mounting portion is provided with a notch at a position corresponding to the fixing hole of the second yoke. With such a configuration, even when a protrusion provided at the tip of the fixing portion of the first yoke protrudes from the fixing hole of the joining plate of the second yoke, the mounting portion of the frame is used as the second yoke. It can be attached to the joining plate without any gap.

  Further, it is preferable that a contact portion that contacts the surface of the fixed portion and a relief portion that faces the surface of the fixed portion with a predetermined interval are formed on the inner peripheral surface of the fixed hole. According to such a configuration, the fixing hole is fixed to the fixing portion so that there is no displacement at the contact portion, and the second yoke is firmly fixed to the first yoke without rattling. Further, by increasing or decreasing the area of the escape portion, the area of the contact portion can be reduced or increased, and the magnitude of the force for pressing the protrusion into the fixing hole can be adjusted.

  Further, it is more preferable that the fixing hole is formed in a square shape, and the relief portion is formed in a corner portion of the square shape. When the fixing portion is formed from a plate and the cross-sectional shape is a square, the burr is often formed at the corner, so according to such a configuration, the edge of the fixing hole and the inner peripheral surface are effectively used. The burr of the fixed part can be avoided. Therefore, it is not necessary to set a large clearance between the surface of the fixing portion and the inner peripheral surface of the fixing hole in consideration of the burr of the fixing portion. The fixing hole is fixed so that the fixing hole is not displaced, and the second yoke is firmly fixed to the first yoke without rattling. The plastic deformation of the fixed portion and the second yoke due to the load accompanying the press-fitting can be prevented.

  Further, the fixing hole may be formed in a rectangular shape, and the escape portion may be formed in a longitudinal direction of the rectangular shape. Since the burr may be formed in the longitudinal direction when the cross-sectional shape of the fixing part is rectangular, according to such a configuration, the burr of the fixing plate is effectively prevented at the edge and inner peripheral surface of the fixing hole. Can be avoided. Therefore, it is not necessary to set a large clearance between the surface of the fixing portion and the inner peripheral surface of the fixing hole in consideration of the burr of the fixing portion. The fixing hole is fixed so that the fixing hole is not displaced, and the second yoke is firmly fixed to the first yoke without rattling.

  In the motor according to the present invention, the fixing hole formed so that the protrusion formed so as to protrude from the front end surface of the fixing portion of the first yoke penetrates the second yoke from one surface to the other surface. The front end surface of the fixed portion of the first yoke is in contact with one surface of the second yoke while being press-fitted into the second yoke, and the front end of the protrusion protrudes from the other surface of the second yoke. ing. Therefore, the depth of press-fitting of the fixing hole into the fixing portion is not too shallow or too deep, and the positional relationship between the fixing portion and the fixing hole can be accurately positioned. For this reason, it is possible to prevent a shift in the relative positional relationship between the first yoke and the second yoke.

  Hereinafter, a motor 2 according to an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is an exploded perspective view showing a motor according to an embodiment of the present invention. FIG. 2 is a perspective view showing a state where the motor shown in FIG. 1 is assembled. FIG. 3 is a perspective view showing a stator S in which two-phase stator members are overlapped. FIG. 4 is an exploded perspective view showing a stator member provided in the motor shown in FIG. FIG. 5 is a view showing a state in which the pole tooth portion of the second yoke is positioned on the first yoke. FIG. 6 is a perspective view showing the appearance of the stator member.

(Configuration of the entire motor)
As shown in FIGS. 1 and 2, the motor 2 includes a stator S formed by superposing two-phase stator members 1. As shown in FIG. 3, the stator S is configured such that the first yokes Y <b> 1 of the respective stator members 1 are overlapped back to back, and the terminal blocks 42 of the respective stator members 1 are overlapped with each other. ing. These stator members 1 are spot-welded at the end faces Y1a and Y1a of the first yoke Y1, and are fixed so that the pole teeth 10 of the respective stator members 1 are arranged coaxially.

  The rotor 2 having the rotor magnet M attached to the rotor shaft RS disposed on the inner periphery of the stator S is disposed to constitute the motor 2. The rotor R includes a rotor magnet M corresponding to each stator member 1, and these rotor magnets M are fixed to the outer periphery of the rotor shaft RS. The rotor shaft RS is rotatably supported at both ends by bearing bodies 62a and 62b.

In the motor 2 including the stator S, a rotational driving force is applied to the rotor R by the interaction between the magnetic field generated by the current flowing through the coil 12 and the rotor magnet M, and the rotational output is output from the front end side of the rotor shaft RS. The

  A shaft end 60a on the base end side (opposite output side) of the rotor shaft RS is pivotally supported via a bearing body 62a. The rotor shaft RS is supported via a steel ball 64a. The steel ball 64a is held by a concave cone surface (not shown) provided on the shaft end 60a of the rotor shaft RS and a concave cone surface 66a provided on the bearing body 62a. A plate-like bearing holder 68a made of a metal sintered body or the like is disposed on the opposite end portion (lower surface in the figure) of the stator S, and the bearing body 62a is used for the bearing body of the bearing holder 68a. It is attached to the through hole 70. A pressurizing member 72 made of a metal plate is disposed further on the opposite side to the bearing holder 68a. The pressurizing member 72 has six claw portions 74 extending from the outer peripheral edge to the bearing holder 68a. By being engaged with the outer peripheral edge, the bearing holder 68a is fixed. A leaf spring portion 76 is cut and raised to the bearing side of the pressurizing member 72, and the leaf spring portion 76 biases the bearing body 62a mounted in the bearing body through hole 70 toward the rotor shaft RS, Pressure toward the tip side is applied to the rotor shaft RS.

  The shaft end 60b on the front end side (output side) of the rotor shaft RS is an output side surface of one stator member 1 of the stator S in which the stator members 1 for two phases are overlapped, that is, the stator shown on the upper side in FIG. It is supported by a bearing provided on a frame 78 attached to the upper surface of the member 1 (the upper surface of the joining plate 52 of the second yoke Y2 to be described later).

  On the front end side of the frame 78, there is provided a bearing including a single steel ball 64b with which a concave conical surface 78 provided on the shaft end 60b of the rotor shaft RS abuts, and a bearing body 62b that accommodates the steel ball 64b. It is done. Since the bearing body 62 b has the flange 82 larger than the inner diameter of the mounting hole 80 of the frame 78, the bearing body 62 b does not come off in the axial direction when attached to the frame 78.

  A screw groove 84 is spirally formed on the surface of the lead screw portion 82 protruding from the stator S of the rotor shaft RS. The lead screw portion 82 has a function of translating a slider (not shown) engaged with the screw groove 84 in the axial direction along with the rotation of the rotor shaft RS. Note that the moving direction of the slider is controlled by switching the rotation direction of the rotor shaft RS.

(Configuration of stator member in the present invention)
The stator member 1 shown in FIG. 4 has a plurality of pole teeth 10, which are pole portions constituting an N-pole or S-pole magnetic pole, standing up on the inner periphery when a current flows through the coil 12. A first yoke Y1 in which a fixing plate 14 is erected and formed as a fixing portion to which the coil 12 is fixed on the outer peripheral side of the tooth 10 and a through-hole 16 through which the fixing plate 14 is inserted and a winding is wound. The plurality of pole teeth 10 are erected so as to mesh with the coil bobbin 18 and the plurality of pole teeth 10 of the first yoke Y1, and the protrusions 28 formed on the distal end surface 14d of the fixing plate 14 are inserted. And a second yoke Y2 provided with a fixing hole 20b.

(Configuration of first yoke)
The first yoke Y1 is formed with a magnet plate 22 into which the rotor magnet M described above is inserted in the bottom plate 24a, and on both sides of the bottom plate 24a, a fixing plate 14 as a fixing portion to which the coil 12 is fixed, 14 includes a connecting portion 24 formed upright, and a pair of pole teeth 26 a and 26 a formed with a plurality of pole teeth 10 upright along the periphery of the magnet hole 22. The first yoke Y1 is formed by pressing a magnetic steel plate such as iron. In this case, the yoke is often molded so as to be extruded from the mold in the longitudinal direction when the yoke is formed. By forming in this way, it is possible to prevent plastic deformation accompanying the forming of the yoke. However, in such a molding method, the burrs 30 are often formed in the longitudinal direction (see FIG. 7).

  As shown in FIG. 4, the connecting portion 24 has a magnet hole 22 formed in the center of a substantially square bottom plate 24a, and band-shaped fixing plates 14 and 14 are extended from opposite edges of the bottom plate 24a. ing. The pair of fixed plates 14 and 14 are bent at a substantially right angle with respect to the bottom plate 24a and bent so as to extend in substantially the same direction as the rotor shaft RS. The fixing plate 14 is formed with a projection 28 for fixing a joining plate 52 constituting a second yoke Y2, which will be described later, so as to protrude from the tip surface 14d. The protrusion 28 is formed such that the tip of the protrusion 28 protrudes in a state where the protrusion 28 is inserted into the fixing hole 20 b of the bonding plate 52. That is, the length from the front end surface 14 d of the fixing plate 14 to the front end surface of the protrusion 28 is formed slightly larger than the thickness of the joining plate 52. Further, the corner of the tip of the projection 28 is cut off obliquely to form a tapered surface 28a.

  The pole tooth portion 26 a is configured by providing a pedestal 32 a for connecting each pole tooth 10 on the proximal end side of the plurality of pole teeth 10 that are erected so as to extend along the periphery of the magnet hole 22 of the connecting portion 24. Has been. A cutout 34 into which the fixing plate 14 disposed on both ends of the connecting portion 24 is fitted is formed on the outer edge of the pedestal 32 a, and the fixing plate 14 is fitted into the cutout 34. The first yoke Y <b> 1 is a split core configured by connecting paired pole teeth 26 a and 26 a by a connecting portion 24.

When the pole tooth portions 26a, 26a are integrally assembled to the connecting portion 24 through the notch 34 of the pole tooth portion 26a from the tip of the fixing plate 14 of the connecting portion 24, the plurality of pole teeth 10, 10 A first yoke Y1 is formed in which fixing plates 14, 14 are formed upright on both sides. In the present embodiment, the first yoke Y1 has the connecting portion 24 and the pole tooth portions 26a and 26a formed as separate bodies, and an example in which these are combined is shown. The whole may be formed integrally, or the pole teeth 10 and the fixing plates 14 and 14 are formed separately as separate bodies, and these may be combined.

(Attaching the coil to the first yoke)
As shown in FIG. 5, the fixing plates 14 and 14 of the first yoke Y1 thus configured are inserted into the through holes 16 of the coil bobbin 18, and the coils 12 and 12 are fixed to the first yoke Y1. Here, since the cross-sectional shape of the fixing plate 14 and the cross-sectional shape of the through-hole 16 of the coil bobbin 18 are formed in substantially the same shape, the fixing plate 14 is inserted into the through-hole 16 by applying a slight force. 14 is performed by light press-fitting of 14 into the through hole 16. At this time, in the through hole 16 of the coil bobbin 18, relief portions 16 a are formed at positions corresponding to the corners of the cross section of the fixing plate 14. Even in such a case, the burr of the fixing plate 14 is not caught on the opening edge or the inner peripheral surface of the through hole 16, and the fixing plate 14 can be smoothly inserted into the through hole 16. Therefore, the assembling workability for assembling the coil bobbin 18 to the first yoke Y1 is improved. In addition, the first yoke Y1 may be deformed or the inner circumference of the through-hole 16 of the coil bobbin 18 because a large force is not applied carelessly when the fixing plate 14 is forcibly inserted into the through-hole 16. The surface is shaved, and the positional relationship between the pole teeth 10 of the first yoke Y1 and the coil 12 is not displaced, so that the yield can be prevented from decreasing.

(Configuration of second yoke)
As shown in FIG. 6, the second yoke Y2 is formed from a pair in which a plurality of pole teeth 10 arranged so as to mesh with the plurality of pole teeth 10 provided on the first yoke Y1 are erected. Pole teeth 26b, 26b and a joining plate 52 for fixing the pole teeth 26b, 26b of the second yoke Y2 to each other and fixing the second yoke Y2 and the first yoke Y1. Has been. The pole tooth portions 26b and 26b are divided cores formed on the divided bases 32b and 32b, respectively. Positioning holes 20a through which the fixing plate 14 is inserted are formed in the pair of pole teeth portions 26b and 26b, respectively, and a fixing hole through which the projection 28 formed at the tip of the fixing plate 14 is inserted in the joining plate 52. 20b is formed. The second yoke Y2 is formed by pressing a magnetic steel plate such as iron.

As shown in FIG. 6, the tip of the fixing plate 14 of the first yoke Y1 is inserted into the positioning hole 20a provided in the pole tooth portion 26b of the second yoke Y2, and the pole teeth of the second yoke Y2 are inserted. The portion 26b is positioned on the first yoke Y1. Here, since the cross-sectional shape of the fixing plate 14 and the cross-sectional shape of the positioning hole 20a are formed in substantially the same shape, insertion of the fixing plate 14 into the positioning hole 20a applies a slight force to the fixing plate 14. Is press-fitted into the positioning hole 20a. At this time, in the positioning holes 20a, relief portions 20a-a are formed at positions corresponding to the corners of the cross section of the fixing plate 14, so that burrs or the like are temporarily formed at the corners of the cross section of the fixing plate 14. Even if it has been done, this burr or the like will not be caught by the opening edge or the inner peripheral surface of the positioning hole 20a, and the fixing plate 14 can be smoothly inserted into the positioning hole 20a. Therefore, the assembling workability for assembling the pole tooth portion 26b of the second yoke Y2 to the first yoke Y1 is improved. In addition, since a large force is not applied unintentionally when the fixing plate 14 is forcibly inserted into the positioning hole 20a, the pole tooth portions 26a and 26b of the first yoke Y1 and / or the second yoke Y2 are prevented. The position of the pole teeth 10 between the first yoke Y1 and the second yoke Y2 is not shifted or the pole teeth 10 are not in contact with each other. A decrease in yield can be prevented.

Furthermore, as shown in FIG. 6, the joining plate 52 is a plate-like member provided with a shaft hole 54 through which the rotor shaft RS is inserted. Fixing holes 20b and 20b through which the protrusions 28 provided at the tip of the fixing plate 14 are inserted are formed on both sides of the shaft hole 54 so as to penetrate from one surface of the joining plate 52 to the other surface.

The joining plate 52 is fixed to the protrusion 28 provided at the tip of the fixing plate 14 of the first yoke Y1, thereby fixing the pole teeth 26b and 26b of the second yoke Y2 to each other and the second. The yoke Y2 and the first yoke Y1 are fixed.

  A stator S as shown in FIG. 3 is configured by superposing the stator members 1 thus configured for two phases. The motor of the present embodiment incorporates a stator S.

(Mounting of motor to frame in embodiment)
As shown in FIG. 1, the frame 78 is attached to the stator S by attaching the attachment portion 86 to the upper surface of the stator S and joining them. A shaft hole 88 through which the rotor shaft RS is inserted is formed at the center of the mounting portion 86, and protrusion concave portions 90, 90 are provided on both sides thereof. The mounting portion 86 is disposed so as to overlap the upper surface of the stator S. From the upper surface of the stator S, that is, from the end surface of the second yoke Y2 of the stator member 1 on the output side of the stator S, the first yoke Y1 is provided. The tip of the protrusion 28 provided at the tip of the fixing plate 14 protrudes. Therefore, if the recesses 90 and 90 are provided, the mounting portion 78 can be brought into contact with the upper surface of the stator S without a gap, avoiding the projection 28. The motor 1 shown in FIG. 2 shows an example in which notches are formed as the recesses 90, 90. However, the recess is not limited to the notch, and may be formed, for example, in a groove shape. What is necessary is just to form in concave shape so that it may not contact | abut.

The end face of the attachment portion 86 of the frame 78 and the end face of the second yoke Y2 of the stator member 1 on the output side of the stator S are formed so as to be disposed on substantially the same plane. The attachment portion 86 and the end face of the second yoke Y2 are joined by spot welding to fix the frame 78 to the stator S, whereby the rotor magnet M attached to the rotor shaft RS is disposed on the inner periphery of the stator S. The

(Description for each member in this embodiment)
FIG. 7 is a top view showing the fixing plate 14 of the first yoke Y1. In the first yoke Y <b> 1 of the stator member 1, burrs protruding in the plate thickness direction may be formed on the end surface of the connecting portion 24 by press working when the connecting portion 24 is punched out. In addition, the burrs protruding in the plate pressure direction may be pressed and the burrs 30 protruding in the surface direction of the fixing plate 14 may be formed by pressing when the fixing plates 14 and 14 on both sides of the bottom plate 24a are bent. is there. In such a case, as shown in FIG. 7, the burr 30 is formed so as to protrude from both ends of one long side of the substantially rectangular cross section of the fixing plate 14 in the same direction as the long side. FIG. 7 shows an example in which burrs 30 are formed on both sides of one surface 14b of the fixing plate 14, but both surfaces of the fixing plate 14 protrude from four corners of a substantially rectangular cross section. It is also conceivable that burrs are formed. Further, the burr 30 may be formed over the entire circumference of the outline of the fixed plate 14 or may be formed partially. Moreover, the case where a burr | flash does not generate | occur | produce is also considered.

FIG. 8 is a top view showing the pole tooth portion 26a. The notch 34 has substantially the same shape as the cross-sectional shape of the fixed plate 14. As shown in FIG. 7, since the fixing plate 14 is formed in a substantially rectangular cross section, the cutout 34 is also formed by cutting out one side of the pole tooth portion 26a into a substantially rectangular shape. The width W34 has substantially the same length as the width W14 of the fixed plate 14.

Further, a relief portion 34 a is formed in a concave shape at a position corresponding to the corner of the cross section of the fixed plate 14. As shown in FIG. 7, burrs 30 are likely to occur at the corners of the cross section of the fixed plate 14, and the burrs 30 are formed so as to protrude in the surface direction from the edge of one surface 14 b of the fixed plate 14. Therefore, the escape portion 34 a of the notch 34 is formed in a concave shape on the back side of the side surfaces 34 b and 34 b of the notch 34 so as to avoid the burr 30. In addition, for example, even if burrs are not formed, a relief portion can be formed in a place where burrs are supposed to occur in advance.

Here, since the notch 34 of the pole tooth portion 26 a is formed with a relief portion 34 a, when the fixing plate 14 is inserted into the notch 34, the burr 30 of the fixing plate 14 is at the edge of the notch 34. The fixing plate 14 can be smoothly inserted into and inserted into the notch 34 without being caught. Therefore, the workability of the operation of connecting the pole tooth portion 26a and the connecting portion 24 is improved. Further, since the fixing plate 14 is not forced to be inserted into the notch 34 and a large force is not inadvertently applied, the first yoke is not deformed and the yield is prevented from being lowered. it can.

Furthermore, since the escape portion 34a is formed in the notch 34 of the pole tooth portion 26a, it is not necessary to set the width W34 of the notch 34 larger in consideration of the size of the burr 30 of the fixing plate 14. Therefore, it is possible to set the clearance with respect to the outer shape of the fixing plate 14 to be extremely small at a portion other than the relief portion 34a of the notch 34.

  In FIG. 9, the top view of the state which attached the pole tooth part 26a to the fixing plate 14 is shown. In the portion other than the burr 30 of the fixing plate 14, an abutting portion 36 a that abuts closely with the end faces 34 b, 34 b, 34 c of the notch 34 is formed. In FIG. 9, both end surfaces 14 a and 14 a of the fixing plate 14 are in contact with both side surfaces 34 b and 34 b of the notch 34. Further, the end surface 34 c at the back of the notch 24 is in contact with one surface 14 b of the fixing plate 14. As a result, the pole tooth portion 26a is firmly fixed to the connecting portion 24 without rattling, the characteristics of the stator member 1 are stabilized, and a decrease in yield can be prevented.

FIG. 10 is a cross-sectional view showing an AA cross section of a coil bobbin in a state where the coil is not wound. As shown in FIGS. 1 and 10, the coil bobbin 18 is provided with flanges 40a and 40b at both ends of a rectangular tube-shaped main body 38, and a terminal block 42 is provided at the outer edge of one flange 40a. . A coil 12 is formed by winding a winding having a surface such as a copper wire coated on the body 38 of the coil bobbin 18 with a plurality of turns. Both ends 12 a and 12 a of the winding are entangled with a pair of terminals 44 and 44 provided on the terminal block 42. A current is supplied to the coil 12 through the terminals 44 and 44.

  The pair of coils 12, 12 provided in the stator member 1 is fed with a bipolar drive in which the winding direction of each coil 12 is the same and connected in series, or in series with the winding direction reversed. Unipolar drive can be applied.

  At the center of the coil bobbin 18, a through hole 16 is provided through which the fixing plate 14 of the first yoke Y1 is inserted. As shown in FIG. 10, the through hole 16 has substantially the same shape as the cross-sectional shape of the fixing plate 14. As shown in FIG. 7, since the fixing plate 14 is formed in a substantially rectangular cross section, the through hole 16 is also formed in a substantially rectangular cross section, and the length T16 of the short side of the rectangle is the plate of the fixing plate 14. The long side length W16, which is substantially the same as the thickness T14, is formed to be substantially the same as the width W14 of the fixed plate 14.

Further, a relief portion 16a is formed in a concave shape at a position corresponding to the corner of the cross section of the fixing plate 14 so as to avoid the burr 30 illustrated in FIG. The escape portions 16a are formed in the shape of grooves recessed in the long side direction at the four corners of the inner peripheral surface of the through hole 16 having a substantially rectangular cross section. As shown in FIG. 7, the burr 30 of the fixing plate 14 is formed only at the edge of the one surface 14 b of the fixing plate 14, but the escape portion 16 a of the through hole 16 of the coil bobbin 18 has a substantially rectangular shape 4. It is formed in the corner so as to be recessed in the long side direction. Thus, by providing the relief portions 16a at the four corners of the through-hole 16, the relief portions 16a can be arranged at positions corresponding to the burrs of the fixing plate 14 even if the direction of the coil bobbin 18 is changed. it can. Further, it is possible to cope with a case where burrs are formed at the edges of both surfaces of the fixing plate 14.

Furthermore, since the escape portion 16a is formed in the through hole 16 of the coil bobbin 18 at a position corresponding to the burr of the fixing plate 14, the size of the through hole 16 is considered in consideration of the size of the burr 30 of the fixing plate 14. There is no need to set a large size. Therefore, it is possible to set the clearance with respect to the outer shape of the fixing plate 14 to be extremely small at a portion other than the escape portion 16a of the through hole 16.

FIG. 11 is an enlarged cross-sectional view of the through hole 16 in a state where the fixing plate 14 is inserted into the through hole 16 of the coil bobbin 18. Thus, since the clearance with respect to the external shape of the fixing plate 14 of the through hole 16 is set to be extremely small, in the state where the fixing plate 14 is inserted through the through hole 16, the long side of the inner peripheral surface of the through hole 16 is arranged. Both surfaces 16b and 16b are in contact with one surface 14b and the other surface 14c (upper and lower surfaces in the figure) of the fixing plate 14, and both surfaces 16c and 16c on the short side of the inner peripheral surface of the through hole 16 are plates. It is in contact with both end surfaces 14a, 14a (left and right surfaces in the figure) in the thickness direction. As described above, since the contact portion 36b that contacts the surface of the fixing plate 14 without a gap is formed on the inner peripheral surface of the through hole 16, the coil bobbin 18 is firmly fixed to the fixing plate 14 without rattling. . As a result, the characteristics of the stator member 1 are stabilized, and a decrease in yield can be prevented.

Then, the second yoke Y2 is further assembled and fixed to a portion protruding from the through hole 16 of the coil bobbin 18 of the fixing plate 14 of the first yoke Y1.

  FIG. 12 is a plan view illustrating the pole tooth portion 26b as viewed from above. The positioning hole 20 a of the pedestal 32 b has substantially the same shape as the cross-sectional shape of the fixed plate 14. As shown in FIG. 9, since the fixing plate 14 is formed in a substantially rectangular cross section, the positioning hole 20 a is also formed in a substantially rectangular cross section, and the length T20 a of the short side of the rectangle is the plate of the fixing plate 14. The long side length W20a, which is substantially the same as the thickness T14, is formed to be substantially the same as the width W14 of the fixed plate 14.

Furthermore, relief portions 20a-a are formed in a concave shape at positions corresponding to the corners of the cross section of the fixing plate 14 so as to avoid the burrs 30 illustrated in FIG. The burr 30 of the fixing plate 14 is formed so as to protrude from the end edge of the one surface 14b of the fixing plate 14, but the relief portions 20a-a of the positioning holes 20a are long at the four corners of a substantially rectangular shape. It is formed in a concave shape in the side direction. In this way, by providing the relief portions 20a-a at the four corners of the positioning hole 20a, when the burr is formed on the other surface 14c of the fixing plate 14, or both the surfaces 14b of the fixing plate 14, A case where burrs are formed at the edge of 14c can also be handled.

Furthermore, since the escape hole 20a-a is formed in the positioning hole 20a at a position corresponding to the burr 30 of the fixing plate 14, the positioning hole 20a is considered in consideration of the size of the burr 30 of the fixing plate 14. There is no need to set the size of. Therefore, the clearance with respect to the outer shape of the fixed plate 14 can be set to be extremely small in a portion other than the relief portion 20a-a of the positioning hole 20a.

FIG. 13 is a top view showing a state in which the fixing plate 14 is inserted into the positioning hole 20a of the pole tooth portion 26b. Thus, since the clearance with respect to the external shape of the fixing plate 14 of the positioning hole 20a is very small, both surfaces of the inner peripheral surface of the positioning hole 20a on the long side are the one surface 14b and the other surface 14c ( The upper and lower surfaces in the drawing are in contact with each other, and both short side surfaces of the inner peripheral surface of the positioning hole 20a are in contact with both end surfaces 14a and 14a in the thickness direction (left and right surfaces in the drawing). . Thus, since the contact portion 36c that contacts the surface of the fixed plate without a gap is formed on the inner peripheral surface of the fixed hole (polar tooth portion), the polar tooth portion 26b of the second yoke Y2 is fixed to the fixed plate. 14 is accurately positioned without rattling and is firmly fixed. As a result, the characteristics of the stator member 1 are stabilized, and a decrease in yield can be prevented.

As described above, since the height of the protrusion 28 is formed slightly higher than the thickness of the bonding plate 52, the one surface of the bonding plate 52 in a state where the protrusion 28 is inserted into the fixing hole 20b by press-fitting. The front end surface 14 d of the fixing plate 14 comes into contact with the projection 28, and the front end of the projection 28 protrudes from the other surface of the joining plate 52.

And this joining plate 52 is formed so that the outer peripheral end face is arranged in substantially the same plane as the outer peripheral end face of the pedestal 32b of the pole tooth portions 26b, 26b in a state where the projection 28 is inserted into the fixing hole 20b. . By spot-welding the outer peripheral end face of the joining plate 52 and the outer peripheral end faces of the pole tooth portions 26b and 26b at several places, the pair of pole tooth portions 26b and 26b are fixed to each other to form the second yoke Y2.

  Further, the end edge of the fixing hole 20b and the surface of the projection 28 are similarly fixed by welding. As a result, the joining plate 24 and the first yoke fixing plate 14 are fixed, and the first yoke Y1 and the second yoke Y2 are accurately aligned and fixed to each other.

  FIG. 14 is a plan view illustrating a state in which the bonding plate 52 is viewed from above. The fixing hole 20 b has substantially the same shape as the cross-sectional shape of the protrusion 28 of the fixing plate 14. As shown in FIG. 9, since the projection 28 is formed in a substantially rectangular cross section, the fixing hole 20b is also formed in a substantially rectangular cross section. The short side length T20b of this rectangle is the length of the projection 28 of the fixing plate 14. The long side length W20b, which is substantially the same as the plate thickness T14, is formed to be substantially the same as the width W28 of the protrusion 28.

Further, as shown in FIG. 14, a relief portion 20b-a is formed in a concave shape at a position corresponding to the corner of the cross section of the projection 28 so as to avoid the burr 30a as illustrated in FIG. Has been. The burr 30a of the protrusion 28 is formed so as to protrude from the edge of the one surface 14b of the fixing plate 14. On the other hand, the relief portions 20b-a of the fixing hole (joint plate side) 20b are formed in a concave shape in the long side direction at the four corners of a substantially rectangular shape. In this way, by providing relief portions at the four corners of the fixing hole (joining plate side) 20b, burrs are formed on the other surface 14c of the protrusion 28, or both surfaces 14b, 14c of the protrusion 28 are formed. A case where burrs are formed at the end edges of the film can also be handled.

  Further, as shown in FIG. 4 and FIG. 7 and the like, the corner of the tip of the projection 28 is cut obliquely to form tapered surfaces 28a and 28a. Therefore, when the fixing hole (joining plate side) 20b of the joining plate 52 is inserted into the protrusion 28, when the opening edge of the fixing hole (joining plate side) 20b contacts the tapered surfaces 28a, 28a, the fixing hole (joining plate) Side) 20b is guided to the correct insertion position, and the workability of assembling the joining plate 52 to the protrusion 28 is improved.

FIG. 15 is a top view showing the bonding plate 52 in a state where the protrusions 28 are inserted into the fixing holes 20b of the bonding plate 52. FIG. Thus, since the cross-sectional shape of the protrusion 28 and the cross-sectional shape of the fixing hole 20b are formed in substantially the same shape, the protrusion 28 is inserted into the fixing hole 20b by applying a slight force to the protrusion 28. It is done by light press-fitting into. At this time, since the relief portion is formed in the fixing hole 20b at a position corresponding to the burr 30a of the protrusion 28, the burr 30a of the protrusion 28 is caught on the edge or inner peripheral surface of the fixing hole 20b on the entrance side. The protrusion 28 can be smoothly inserted into the fixing hole 20b. Therefore, the assembling workability for assembling the joining plate 52 of the second yoke Y2 to the first yoke Y1 is improved. Further, when the joining plate 52 is a thin magnetic body, a large force is not applied carelessly to try to forcefully insert the protrusion 28 into the fixing hole 20b. The positions of the outer peripheral end face of the tooth portion 26b and the outer peripheral end face of the bonding plate 52 are not shifted. For this reason, the second yoke Y2 is deformed and the positional relationship of the pole teeth 10 between the first yoke Y1 and the second yoke Y2 is shifted, or the pole teeth 10 are in contact with each other. No reduction in yield can be prevented.

Furthermore, since the relief portion 20b-a is formed in the fixing hole 20b at a position corresponding to the burr 30a of the protrusion 28, the shape of the fixing hole 20b is increased in consideration of the size of the burr 30a of the protrusion 28. There is no need to set to. Therefore, the clearance with respect to the outer shape of the protrusion 28 can be set to be extremely small in a portion other than the relief portion of the fixing hole 20b. for that reason. In a state where the protrusions 28 are inserted into the fixing holes 20b, both surfaces 14b and 14c (upper and lower surfaces in the drawing) of the protrusions 28 and both end surfaces 28b and 28b (left and right surfaces in the drawing) of the plate thickness direction are It contacts the inner peripheral surface of the fixing hole 20b over substantially the entire surface. As described above, since the contact portion 36d that contacts the surface of the protrusion 28 without gap is formed on the inner peripheral surface of the fixing hole 20b, the second yoke Y2 and the first yoke Y1 are accurately connected to each other. Positioned. In the escape portion 20b-a, a gap is formed between the inner peripheral surface of the fixing hole 20b and the outer peripheral surface of the protrusion 28. The second yoke Y2 and the first yoke Y1 are connected to each other by welding the surface of the protrusion 28, the opening edge of the fixing hole 20b, and the outer peripheral end surfaces of the joining plate side 52 and the pole teeth 26b, 26b. It is firmly fixed in a state where it is accurately positioned. As a result, the characteristics of the stator member 1 are stabilized, and a decrease in yield can be prevented.

  FIG. 16 is an enlarged perspective view showing a state in which the protrusion 28 provided at the tip of the fixing plate 14 of the first yoke Y1 is inserted into the fixing hole 20b of the joining plate 52 of the second yoke Y2. Thus, in the state where the stator member 1 is assembled, the tip of the projection 28 protrudes from the opening edge of the fixing hole 20b. As shown in FIG. 15, both surfaces 14b and 14c of the projection 28 and both end surfaces 28b and 28b in the plate thickness direction are in contact with the inner peripheral surface of the fixing hole 20b over substantially the entire surface. On the other hand, in the escape portion 20b-a provided at a position corresponding to the burr 30a of the protrusion 28, the surface of the protrusion 28 and the inner peripheral surface of the fixing hole 20b face each other with a slight gap. Then, the joint edge 52 of the second yoke Y2 is fixed to the tip of the connecting portion 24 of the first yoke Y1 by spot welding the opening edge of the fixing hole 20b in several places.

In FIG. 16, the four corners near the opening edge of the fixing hole 20b, the center portion of the short side, and the two points of the long side are surrounded by circles x as spots to be spot welded. At that time, the partially melted projection 28 flows into the gap between the relief portion 20b-a of the fixing hole 20b and the surface of the projection 28. In this way, the gap between the relief portion 20b-a of the fixing hole 20b and the surface of the projection 28 can be closed.

Further, as described above, the portions other than the relief portion 20b-a on the inner peripheral surface of the fixing hole 20b are in contact with the surface of the protrusion 28 without any gap, so that the gap of the relief portion 20b-a is melted. The contact area between the surface of the protrusion 28 and the inner peripheral surface of the fixing hole 20b is increased by filling with the tip of the protrusion 28, and the joining plate 52 is firmly fixed to the tip of the fixing plate 14 of the first yoke Y1. Can do.

Thus, the protrusion 28 provided at the tip of the fixing plate 14 is fixed to the fixing hole so that the tip surface 14d of the fixing plate 14 of the first yoke abuts one surface of the joining plate 52 of the second yoke Y2. By welding the fixing plate 14 and the fixing hole 20b in a state of being press-fitted into the fixing plate 20b, the depth of the press-fitting of the fixing hole 20b into the fixing plate 14 is not too shallow or too deep. And the fixing hole 20b can be positioned accurately. At this time, since the tip of the protrusion 28 protrudes from the other surface of the bonding plate 52, the fixing plate 14 and the fixing hole 20b can be easily welded. Therefore, the fixing plate 14 and the fixing hole 20b can be accurately welded, and the joining plate 52 can be securely and firmly fixed to the tip of the fixing plate 14 of the first yoke Y1.

(Modification of coil bobbin in the present embodiment)
Next, a modification of the shape of the fixing hole (pole tooth portion) and the fixing hole (joining plate side) provided in the through hole and / or the second yoke provided in the coil bobbin will be described. In the description of FIGS. 17A to 17C, the fixing hole (pole tooth portion) and the fixing hole (joining plate side) are referred to as a fixing hole, and are described with the same reference numerals. For example, as shown to Fig.17 (a), the relief part 16-1a which consists of a substantially circular hollow in the corner | angular part of the through-hole 16-1 and / or the fixing hole 20-1 formed in the rectangle, and / or fixing The structure in which the hole 20-1a is provided may be sufficient. Further, as shown in FIG. 17B, the burr 30-1 of the fixed plate (and / or the protrusion formed on the tip surface thereof) 14-1 is formed in the thickness direction of the fixed plate 14-1. Even if it is the case where it is the case, it is the structure by which escape part 16-2a and / or 20-2a formed concavely in the short side direction of the through-hole 16-2 and / or the fixing hole 20-2 are provided. good. Also, as shown in FIG. 17 (c), the width of the relief portions 16-3a and / or 20-3a provided in a concave shape on the inner peripheral surface of the through-hole 16-3 and / or the fixing hole 20-3, You may provide larger than the magnitude | size of the burr | flash of the fixing plate 14-1. In this way, when the fixing plate 14-1 is inserted into the through-hole 16-3 and / or the fixing hole 20-3 by changing the width (frontage) of the escape portions 16-3a and / or 20-3a. The area of the contact portion 36-3 where the surface of the fixed plate 14-1 and the inner peripheral surface of the through hole 16-3 and / or the fixed hole 20-3 contact can be made different. If the width (frontage) of the escape portion 16-3a and / or 20-3a is reduced, the area of the contact portion 36-3 is increased, and the width (frontage) of the escape portion 16-3a and / or 20-3a is reduced. If it is increased, the area of the contact part 36-3 is reduced. In this way, the force required to press-fit the fixing plate 14-1 into the through hole 16-3 and / or the fixing hole 20-3 can be controlled.

(Effects of this embodiment)
According to the stator member 1 provided in the motor 2, the fixing plate 14 is provided on one surface of the joining plate 52 in a state where the projection 28 of the first yoke Y1 is press-fitted into the fixing hole 20b of the second yoke Y2. Since the tip surface 14d abuts and the tip of the projection 28 protrudes from the other surface of the joining plate 52, the press-fitting depth of the fixing hole 20b into the fixing plate 14 may be too shallow or too deep. In addition, the positional relationship between the fixing plate 14 and the fixing hole 28 can be accurately positioned. It is possible to prevent a deviation from occurring in the relative positional relationship between the first yoke Y1 and the second yoke Y2.

  Further, since the tip portions of the protrusions 28 are provided with the tapered surfaces 28a, 28a, the protrusions 28 can be smoothly inserted into the fixing holes 20b.

  Furthermore, the outer peripheral surface of the tip end portion of the projection 28 of the first yoke Y1 and the opening edge of the fixing hole 20b of the second yoke Y2 are welded to fix the first yoke Y1 and the second yoke Y2. Therefore, when the protrusion 24 provided on the distal end surface 14d of the fixing plate 14 of the first yoke Y1 is press-fitted from one surface into the fixing hole 20b provided in the joining plate 52 of the second yoke Y2, the protrusion 28 is provided. Since the tip of the projection protrudes from the other surface of the joining plate 52, the fixing hole 20b and the projection 28 are easily welded. Therefore, the first yoke Y1 and the second yoke Y2 can be accurately positioned and securely fixed.

  Further, the frame 78 attached to the second yoke Y2 is provided with a concave portion 90 at a position corresponding to the fixing hole 20b of the second yoke Y2 in the attachment portion 86 fixed in contact with the joining plate 52. Therefore, even if the projection 28 provided on the front end surface 14d of the fixing plate 14 of the first yoke Y1 protrudes from the fixing hole of the joining plate 52 of the second yoke Y2, the mounting portion 86 of the frame 78 is not attached to the second mounting portion 86. The yoke Y2 can be attached in contact with the joining plate 52 without any gap. With such a configuration, the protrusions 28 can be engaged with the recesses 90 to function as alignment between the frame 78 and the stator member 1. Thereby, the position accuracy of the frame 78 and the rotor shaft RS can be further increased.

  Further, a contact portion 36d that contacts the surface of the fixed plate 14 and a relief portion 20b-a that faces the surface of the fixed plate 14 with a predetermined interval are formed on the inner peripheral surface of the fixed hole 20b. Therefore, the fixing hole 20b is fixed to the fixing plate 14 at the contact portion 36d so that there is no displacement, and the second yoke Y2 is firmly fixed to the first yoke Y1 without rattling. Further, by increasing or decreasing the area of the escape portion 20b-a, the contact area with the contact portion 36d can be changed as appropriate, and the load applied when the protrusion is press-fitted into the fixing hole 20b can be adjusted. .

  Further, in accordance with the cross-sectional shape of the fixing plate 14, the fixing hole 20b is formed in a rectangular shape in more detail than the rectangular shape, and the relief portion 20b-a is formed in the longitudinal direction of the rectangular shape at the rectangular corner portion. The burr of the fixing plate 14 can be effectively avoided at the end edge and the inner peripheral surface of the fixing hole 20b. For this reason, it is not necessary to set a large clearance between the surface of the fixing plate 14 and the inner peripheral surface of the fixing hole 20b in consideration of burrs or the like of the fixing plate 14, so that fixing is performed at a portion other than the escape portion 20b-a. The surface of the plate 14 and the inner peripheral surface of the fixing hole 20b are in close contact with each other, the fixing hole 20b is fixed to the fixing plate 14 so that there is no displacement, and the second yoke Y2 is positioned higher than the first yoke Y1. Can be fixed with accuracy.

With the motor 2 having such a configuration, the relative positional relationship between the pair of yokes can be fixed so as not to be displaced, and a decrease in yield can be prevented.

(Other examples)
As mentioned above, although embodiment of this invention was described, this invention is not limited to such embodiment at all, Of course, it can implement in a various aspect in the range which does not deviate from the meaning of this invention. For example, in the above embodiment, an example is shown in which two fixing portions are formed in the first yoke and two fixing holes corresponding to these fixing portions are formed in the second yoke. It is sufficient that at least one hole is provided. Further, one fixing portion is formed in the first yoke, a fixing hole corresponding to the fixing portion is formed in the second yoke, and a fixing portion is also provided in the second yoke. A fixing hole corresponding to may be provided in the first yoke. Moreover, in the said embodiment, although the example of the plate-shaped fixing plate was shown as a fixing | fixed part, the shape of a fixing | fixed part is not restricted to this, For example, other shapes, such as rod shape and prismatic shape, may be sufficient. . Further, the relief portion is not limited to the second yoke and the coil bobbin, and is fixed by inserting one member into the other member even if it is other various members attached to the stepping motor. If there is, an escape portion can be provided in the inserted hole. In addition to a stepping motor, for example, like a brushless motor, a plurality of coils are placed on the circumferential surface of the stator core by inserting a mounting hole at the center of the coil into a protrusion provided on the circumferential surface of a cylindrical stator core. In such a case, an escape portion that avoids the burr of the projection of the stator core can be provided in the mounting hole of the coil.

It is a disassembled perspective view which shows the motor which concerns on one Embodiment of this invention. FIG. 2 is a perspective view showing a state where the motor shown in FIG. 1 is assembled. It is a perspective view which shows the stator which piled up the stator member. It is a disassembled perspective view which shows the stator member with which the motor shown in FIG. 1 is provided. It is a figure which shows the state which positioned the pole tooth part of the 2nd yoke in the 1st yoke. It is a perspective view which shows the external appearance of a stator member. It is a top view which shows the state which looked at the fixing plate of the connection part of the 1st yoke from the top. It is a top view which shows the pole tooth part of a 1st yoke. It is a top view which shows the state by which the fixing plate shown in FIG. 7 was penetrated by the pole tooth part shown in FIG. It is sectional drawing which shows the cross section of the coil bobbin single-piece | unit of the state in which the coil is not wound. It is sectional drawing which expanded and showed the through-hole of the state which penetrated the fixing board to the through-hole of the coil bobbin shown in FIG. It is a top view showing the state which looked at the pole tooth part of the 2nd yoke from the upper part. It is the top view which showed the state which penetrated the fixing board to the fixing hole (polar tooth part) of the pole tooth part shown in FIG. It is a top view showing the state which looked at the joining board of the 2nd yoke from the upper part. It is a top view which shows the state which penetrated the protrusion in the fixing hole (joining board side) of the joining board of the 2nd yoke. It is a perspective view which expands and shows the state by which the protrusion of the 1st yoke was penetrated to the fixing hole of the 2nd yoke. It is a figure which shows the 1st modification of the escape part provided in a through-hole and / or a fixed hole. It is a figure which shows the conventional stepping motor. It is a figure which shows the conventional flat type stepping motor.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Stator member 2 Motor 10 Pole tooth 12 Coil 14 Fixing plate 14d Front end surface 16 Through hole 16a, 20a-a, 20b-a, 34a Escape part 18 Coil bobbin 20 Fixing hole 20a Positioning hole 20b Fixing hole 22 Magnet hole 24 Connection Portions 26a, 26b pole tooth portion 28 projection 28a taper surface 30, 30a burr 36a, 36b, 36c, 36d contact portion 52 joint plate Y1 first yoke Y2 second yoke M rotor magnet RS rotor shaft R rotor S stator

Claims (7)

Arranged between a rotor having a rotor magnet attached to the outer peripheral surface of the rotor shaft, a first yoke and a second yoke disposed opposite to each other, and the first yoke and the second yoke A motor having a coil to be operated,
The first yoke is provided with a fixing portion to which the coil is attached so as to extend in a direction parallel to the rotor shaft, and a protrusion is provided so as to protrude from the front end surface of the fixing portion,
The second yoke is provided with a fixing hole penetrating from one surface facing the first yoke to the other surface,
The protrusion provided on the front end surface of the fixing portion of the first yoke is inserted into the fixing hole of the second yoke,
In a state where the protrusion is press-fitted into the fixing hole, the tip surface of the fixing portion abuts on the one surface of the second yoke, and the tip portion of the protrusion is the surface of the second yoke. A motor protruding from the other surface.   The motor according to claim 1, wherein a tip surface of the protrusion is provided with a tapered surface.   The outer peripheral surface of the tip of the projection of the first yoke and the opening edge of the fixing hole of the second yoke are welded to fix the first yoke and the second yoke. The motor according to claim 1, wherein: A bonding plate in contact with the second yoke and having a fixing hole into which the protrusion is press-fitted;
The frame attached to the second yoke is
At least one end portion is provided with a mounting portion that contacts and is fixed to the other surface of the joining plate,
The motor according to any one of claims 1 to 3, wherein the attachment portion is provided with a recess at a position corresponding to the fixing hole of the second yoke.   A contact portion that contacts the surface of the fixed portion and a relief portion that faces the surface of the fixed portion with a predetermined interval are formed on the inner peripheral surface of the fixed hole. The motor according to claim 1.   The motor according to any one of claims 1 to 5, wherein the fixing hole is formed in a polygonal shape, and the relief portion is formed in a corner portion of the polygonal shape. The motor according to any one of claims 1 to 6, wherein the fixing hole is formed in a rectangular shape, and the relief portion is formed in a longitudinal direction of the rectangular shape.

Images