JP5256772B2 - Motor and electronic device using the same - Google Patents

Description

  The present invention relates to a motor and an electronic device using the motor.

  In an electronic device such as a laser printer, a paper feeding roller (driven body) provided in a main body case is connected to a motor, and the paper feeding roller is rotated by driving the motor to feed paper to a predetermined portion. ing.

  The motor includes a stator including a stator core having a plurality of magnetic poles arranged on the outer peripheral portion at a first predetermined interval, and a rotor arranged on the outer periphery of the stator, and the inner periphery of the rotor has a second predetermined interval. Each has a structure in which magnets magnetized with different polarities are arranged.

  Further, the magnetic pole of the stator core is formed with an extended portion extending from the magnetic pole base portion in a direction substantially parallel to the magnet, thereby increasing the driving efficiency.

  That is, the width of the magnet (in the direction orthogonal to the circumferential direction) is larger than the width in the same direction of the magnetic pole base of the stator core so as to be as close as possible to the magnetic detection element that magnetically detects the rotation of the rotor. For this reason, conventionally, an extension called an end plate extending in a direction substantially parallel to the magnet is formed from the magnetic pole base of the stator core, thereby increasing the facing area between the magnetic pole of the stator core and the magnet, thereby It is trying to increase driving force and driving efficiency.

  Such a stator core is constituted by a laminated portion in which a plurality of plate-like bodies are laminated and an end plate portion in which an extension portion is formed. Further, the end plate portion is disposed so as to sandwich the laminated portion between both surfaces of the laminated portion.

  Moreover, in order to fix a several plate-shaped body, the method of laminating | stacking a plate-shaped body sequentially and integrating between the lamination | stacking by dowel crimping is known.

  In the end plate portion in which the extension portion is formed, the amount of magnetic flux from the opposing magnets is significantly increased as compared to the plate-like body of the laminated portion, so that magnetic saturation of the magnetic path connected to the magnetic pole of the stator is likely to occur.

  In particular, the magnetic flux density increases from the surface facing the magnet to the arm where the coil is wound, so magnetic saturation occurs when dowel crimping is performed as in the laminated part as a method of fixing the laminated part and the end plate part. As a result, the driving force and driving efficiency cannot be increased.

As a stator core formed while preventing the occurrence of such magnetic saturation, a stator core formed by laminating a plurality of layers is formed by laminating and fixing a plurality of core sheets only by a powder coating film or an electrodeposition coating film. A configuration is proposed. (For example, see Patent Document 1)
Japanese Patent Laying-Open No. 2001-231191 (5th page, FIGS. 1 and 2)

However, in the conventional configuration disclosed in Patent Document 1 described above, since it is necessary to perform powder coating or electrodeposition coating in a state where a plurality of core sheets are stacked, the core sheet is held while being positioned. A jig is required. In addition, if the jig that holds the core sheet while positioning is mounted as it is during powder coating or electrodeposition coating, it will easily interfere with the coating. There is a problem that not only a great number of man-hours are required, but also the core sheet is likely to be displaced during painting.

  Then, an object of this invention is to provide the motor provided with the stator core which has an extension part which aimed at the improvement of quality with efficiency of the manufacturing process.

In order to achieve the above object, a motor according to the present invention includes a stator including a stator core having a plurality of magnetic poles arranged on an outer peripheral portion thereof, and a rotor rotatably arranged on the outer periphery of the stator. Is arranged with magnets magnetized with different polarities at predetermined intervals, and at the outer peripheral end of the magnetic pole, an extension extending in a direction substantially parallel to the magnet from both sides of the magnetic pole base to the outside a motor forming the said stator core, and the product layer portion has the extended portion, and a pair of end plates disposed on both sides of the laminated portion, the laminated portion is a convex portion on one surface The other surface has a plurality of first plate-like bodies having concave and convex portions that are concave portions by forming the convex portions, and has the same shape as the first plate-like body and has a hole at the position of the convex portions. A plurality of first plates, each of which comprises a second plate-like body having a portion The body is sequentially laminated while pressing the convex portions of the individual first plate-like bodies into the concave portions of the other first plate-like bodies, and a plurality of the first plate-like bodies The convex portion of the first plate-like body of the outermost layer is a laminated portion that is press-fitted into the hole portion of the second plate-like body and integrated, and coil winding of the end plate portion A positioning projection is formed at a position on the inner peripheral side of the innermost portion of the portion, and the stacking portion is engaged with the positioning projection at a position corresponding to the positioning projection of the end plate portion . While forming a hole or a notch of 2 and engaging the positioning projection of the end plate with the second hole or the notch of the laminated part while aligning with the laminated part the temporarily fixed by sandwiching both sides of the laminated portion at the pair of end plates, and the laminated portion by powder coating film or electrodeposition coating film By fixing a serial end plate portion, thereby it is to achieve the intended purpose.

As described above, according to the present invention, the end plate portion and the laminated portion can be fixed in a state where the end plate portion and the laminated portion are reliably positioned at the same time as the insulation process with a small number of steps.
Further, at that time, magnetic saturation is unlikely to occur because no dowels or the like are formed in the magnetic flux concentrating part of the end plate part.

Furthermore, since it is only necessary to form a projecting portion having a shape that can be positioned on the end plate portion, problems such as bending and bending are unlikely to occur.
For this reason, according to this invention, the motor provided with the stator core which has the extension part which aimed at the improvement of quality with efficiency of the manufacturing process can be provided.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1)
In this embodiment, an example of a paper feed motor incorporated in a laser printer as one of electronic devices will be described. The motor in the present embodiment is placed together with various electronic components on a substrate disposed in a horizontal direction in a main body case (not shown) of the laser printer.

  FIG. 1 is a cross-sectional view of a motor according to Embodiment 1 of the present invention. FIG. 2 is a perspective view showing a stator core of the motor according to Embodiment 1 of the present invention. First, the overall configuration of the motor will be described with reference to FIGS. 1 and 2.

As shown in FIG. 1, the motor 12 according to the present embodiment is rotatably disposed on a stator including a stator core 13 mounted on a wiring board 11 via a fixture (not shown) and on the outer periphery of the stator core 13. And a cylindrical rotor 14 whose lower surface is open. Further, a ring-shaped magnet 15 magnetized alternately in N and S poles (adjacent poles are different from each other) is integrally fixed to the inner periphery of the rotor 14 at predetermined intervals. The stator core 13 is formed as a laminated body in which a plurality of plate-like bodies are laminated, and an insulating layer P is formed on the surface thereof by powder coating or electrodeposition coating. And in the outer peripheral part of the stator core 13, as shown in FIG. 2, the several teeth 13a as each magnetic pole are arrange | positioned in the circumferential direction at predetermined intervals. A coil 16 is wound around the arm T constituting the magnetic circuit inside each tooth 13a via the insulating layer P. A stator is formed by winding the coil 16 around the stator core 13.

  That is, by supplying an alternating current to the coil 16, an N-pole and S-pole magnetic field is alternately generated from each tooth 13 a, and an attractive force and a repulsive force are generated between the magnet 15 existing on the outer periphery thereof, This is configured to be the rotational driving force of the rotor 14.

  The stator core 13 is fixed to the wiring board 11 via a housing 19, and a bearing 17 is provided on the inner periphery of the housing 19. A drive shaft 18 is provided through the bearing 17 in the vertical direction, and the upper end of the drive shaft 18 is fixed to the top surface 14 a of the rotor 14. In the present embodiment, the direction in which the rotor 14 is present will be described with respect to the wiring board 11 as the upward direction, and vice versa. That is, for example, in the drive shaft 18, the end portion from the wiring board 11 toward the rotor 14 is an upper end portion, and the opposite end portion is a lower end portion. Further, in the wiring board 11, the side where the rotor 14 is located is described as an upper surface, and the back side is described as a lower surface as appropriate.

  With the configuration as described above, an alternating current is supplied to the coil 16 to alternately generate N-pole and S-pole magnetic fields from the teeth 13a, and the attractive force and repulsive force between the teeth 13a and the magnet 15 are generated. Is generated, the rotor 14 rotates about the drive shaft 18, and the rotational force is transmitted to the paper feed roller via the drive shaft 18.

  Specifically, in the present embodiment, the lower end of the drive shaft 18 passes through a through hole (not shown) of the wiring board 11 and extends below the wiring board 11, and a gear (not shown) is provided below the drive shaft 18. And a gear box (not shown) is connected to the gear, whereby a plurality of paper feed rollers (not shown) in the laser printer are rotated to feed the paper. Yes. That is, the laser printer as the electronic apparatus of the present embodiment includes a main body case, a paper feed roller as a driven body provided in the main body case, and the motor 12 coupled to the driven body. Prepare.

  In addition, a Hall IC 20 is mounted as a magnetic detection element on a portion corresponding to the lower end of the magnet 15 on the wiring board 11. That is, the Hall IC 20 is disposed on the surface of the wiring board 11 so as to face the magnet 15. As is well known, the Hall IC 20 detects the magnetic speed of the magnet 15 of the rotor 14 to detect the rotation speed, and controls the number of rotations of the motor 12 using the detected rotation information.

  The magnet 15 has a lower end extending to the Hall IC 20, that is, the vicinity of the upper surface of the wiring board 11 in order to be as close as possible to the Hall IC 20. Further, in order to avoid a balance shift with respect to the stator core 13 when the lower end of the magnet 15 is extended downward in this way, the upper end of the magnet 15 is also extended upward by the same amount.

  As a conclusion, the vertical dimension of the magnet 15 is large, and accordingly, in this embodiment, as shown in FIGS. 1 and 2, the teeth base portion is provided at the outer peripheral end portion of each tooth 13 a of the stator core 13. Extending from both sides of 33 to the outside is formed integrally with an extension 32 extending in a direction substantially parallel to the magnet 15, that is, in the vertical direction that is the axial direction of the drive shaft 18.

  Specifically, the extension 32 is substantially the same as the magnet 15 in the outer peripheral portion of the two plate-like bodies including the upper and lower surfaces of the plurality of laminated plate-like bodies constituting the stator core 13. In particular, it is formed by bending so as to be parallel to each other and upward and downward.

  Of the plurality of stacked plate-like bodies constituting the stator core 13 in this way, the outer peripheral portion of the upper and lower surface (two pieces including the outermost layer) is substantially parallel to the magnet 15. When the extension portion 32 is formed by bending upward and downward, respectively, the area facing the magnet 15 extended upward and downward is increased as shown in FIG. 1, and as a result, the rotor 14 has a large driving force. Will be given. Such an extension portion 32 is called an end plate, and can increase the magnetic flux drawn into the plate-like body of the stator core 13 by the magnetic collecting effect of the end plate, thereby giving a large driving force to the rotor 14. be able to.

  Further, in particular, in the motor 12 of the present embodiment, the stator core 13 is composed of upper and lower surfaces (two each including the outermost layer) of a plurality of stacked plate-like bodies as shown in FIG. The plate-like body sandwiched between the plate-like bodies has fixing portions 36 arranged in the circumferential direction and in the vicinity of the teeth 13a at predetermined intervals. In the fixing portion 36, each plate-like body is formed by dowel caulking. It is fixed. Then, on the inner peripheral side of the innermost portion S of the coil 16 winding arm portion T of the stator core 13, among the plurality of stacked plate-like bodies, the upper and lower surfaces (each two including the outermost layer) are plate-like. A positioning portion 37 is formed between the body and the plate-like body sandwiched therebetween. While aligning by the positioning portion 37, the upper and lower plate bodies (two each including the outermost layer) and the plate body sandwiched between them are powder-coated as shown in FIG. Alternatively, the insulating layer P is formed and fixed by electrodeposition coating.

  Next, a detailed configuration of the stator core 13 in the motor of the present embodiment will be described.

  FIG. 3 is a diagram showing the configuration of the stator core 13. 3A shows a configuration example when the main part of the stator core 13 is separated, and FIG. 3B shows a configuration example when the main part of the stator core 13 is integrated. .

  As shown in FIG. 3 (a), the stator core 13 of the motor 12 of the present embodiment is arranged so that the laminated portion 330 formed of a plurality of plate-like bodies and both sides of the laminated portion 330 are sandwiched therebetween. And two end plate portions 320. The laminated portion 330 is formed by integrating and laminating a plurality of first plate-like bodies 331 and one second plate-like body 332. Further, the end plate portion 320 is provided to form the end plate as described above, and has an extension portion 32 as an end plate, and a positioning projection on a surface opposite to a direction in which the extension portion 32 extends. The part 321a is formed on the inner peripheral side of the innermost part S of the arm part T around which the coil 16 of the stator core 13 shown in FIG. 1 is wound.

Further, as shown in FIG. 3B, the stacked portion 330 includes a plurality of first plate-like bodies 331 having dowels 331a at the positions of the fixing portions 36 in FIG. And a second plate-like body 332 having a hole 332a at the same position as the dowel 331a. Then, with the plate-like body 332 at the bottom, a predetermined number of plate-like bodies 331 are sequentially stacked, and the convex portion of the dowel 331a is press-fitted into the hole 332a of the lower plate-like body or the concave portion of the dowel 331a. And dowel caulking. Thereby, the stacked portion 330 fixed by the fixing portion 36 is formed. In addition, by inserting a plate-like body in which a hole 332a is formed instead of the dowel 331a like the second plate-like body 332 among a plurality of plate-like bodies constituting the stacked portion 330. When the stacked portions 330 are continuously formed, the stacked portions 330 can be separated by the second plate-like body 332. In addition, by changing the setting of the insertion position of the second plate-shaped body 332 with respect to the plurality of first plate-shaped bodies 331, the stacked portions 330 having different stacked thicknesses can be easily manufactured.

Furthermore, the plate-like body 331 and the plate-like body 332 constituting the laminated portion 330 have a second hole portion 331b separately from the hole portion 332a as the first hole portion at the same position on the plane. . Since each plate-like body 331 and the plate-like body 332 have such hole portions 331b, the through-hole portions 371 are formed by laminating these plate-like bodies. Further, the through-hole portion 371 corresponds to the positioning projection 321a formed on the end plate portion 320 and is located on the inner peripheral side of the dowel 331a and the hole portion 332a, and the coil 16 of the stator core 13 is wound thereon. Formed on the inner peripheral side of the innermost portion S of the arm portion T to be an engaging portion with the positioning projection 321a.
In the present embodiment, an example is given in which each of the upper and lower end plate portions 320 is composed of two plate-like bodies 321 and is integrated by dowel caulking at the positioning projections 321a.

  As shown in FIG. 1, the magnetic flux generated by the magnet 15 fixed to the rotor 14 is focused by the extension 32 of the end plate and concentrated on the arm T where the coil 16 of the end plate is wound. Therefore, the magnetic flux density increases from the extension portion 32 to the arm portion T. When a through hole is formed in the range from the extension 32 to the arm T, the flow of magnetic flux is hindered, so that magnetic saturation occurs, resulting in a reduction in motor efficiency. Therefore, in the present embodiment, the positions of the holes 331b of the laminated portion 330, that is, the through-hole portions 371 and the positioning protrusions 321a of the end plate 320 corresponding to the holes 331b are determined by the coil of the stator core 13. By forming the innermost side S of the arm portion T around which the arm 16 is wound, the flow of the magnetic flux is not hindered.

  3B, the positioning projection 321a of the end plate portion 320 is inserted into and engaged with the through-hole portion 371 formed in the stacked portion 330, so that the stacked portion 330 and the end portion are connected. The plate portion 320 is positioned and the stator core 13 is temporarily fixed. That is, the through-hole part 371 formed in the laminated part 330 and the positioning protrusion part 321a of the end plate part 320 are formed so as to be in the same position on a plane so that they can be engaged with each other. By engaging, the positioning portion 37 as shown in FIG. 2 is obtained.

  The positioning projections 321a of the end plate part 320 and the through-hole part 371 of the laminated part 330 constituting the positioning part 37 can be positioned with respect to each other as long as there are two or more, but two points are symmetrically positioned. Alternatively, it is desirable to form three places. In the present embodiment, two points are formed at point-symmetric positions.

  Then, as shown in FIG. 3B, the end plate 320 is positioned from the upper and lower surfaces of the laminated portion 330 formed by laminating and fixing the plate-like bodies 331 and 332 at a position that does not hinder the flow of magnetic flux. While being superposed and temporarily fixed, the insulating layer P is formed on the exposed surfaces of the laminated portion 330 and the end plate portion 320 by powder coating or electrodeposition coating. In the present embodiment, the insulating layer P is formed on the entire surface of the stator core 13 except for the portion where the stator core 13 is attached to the housing 19 as shown in FIGS. 1 and 3B. Since it is possible to secure electrical insulation between the stator core 13 and the coil 16 if formed on the side of the arm portion T around which the coil 16 is wound and the extension portion 32 that faces the coil 16, the other portions can be The insulating layer P may not be formed.

  Thus, the laminated portion 330 and the end plate portion 320 are fixed by the insulating layer P, and the stator core 13 is completed.

As described above, the structure of the stator core 13 is configured as shown in FIG. 2 and FIG. 3 so that the laminated portion 330 is formed in advance and the end plate portion 320 and the laminated portion 330 and the flow of magnetic flux are not hindered. By performing powder coating or electrodeposition coating in a state where the positioning is performed and temporarily fixed, the fixing to the laminated portion 330 and the insulating treatment can be performed simultaneously.
Accordingly, the end plate portion 320 and the laminated portion 330 can be fixed and insulated by a simple process without causing magnetic saturation and without using a positioning jig for the laminated portion 330 and the end plate portion 320. Moreover, since each end plate part 320 arrange | positioned so that both surfaces of the lamination | stacking part 330 may be pinched | interposed can each be made into the same shape, it can produce in the same production process and can improve the efficiency of productivity.
Further, since the stator core 13 can be formed by one dowel crimping with respect to the dowel 331a of each plate-like body 331, the efficiency of productivity can also be improved. Furthermore, since a method of fixing or positioning with only the dowel 331a and the positioning projection 321a is used, problems such as bending and bending are unlikely to occur, and thereby quality can be improved.

  As an example of the manufacturing method of the stator core 13, the following method is possible.

  First, for example, a plurality of plate-like bodies 331 and one plate-like body 332 are punched out from a band-shaped metal material. Then, with the plate-like body 332 at the bottom, a predetermined number of plate-like bodies 331 are sequentially stacked, and the convex portion of the dowel 331a is press-fitted into the hole 332a of the lower plate-like body or the concave portion of the dowel 331a. And dowel caulking. Thereby, the lamination | stacking part 330 is formed.

  On the other hand, similarly, for example, a plurality of plate-like bodies 321 are punched from a band-shaped metal material. Then, two plate-like bodies 321 are stacked, and the protrusions of the positioning protrusions 321a of the upper plate-like body are press-fitted into the recesses of the positioning protrusions 321a of the lower plate-like body, thereby doweling. Do caulking. Thereafter, the end of the fixed plate-like body is bent. Thereby, the end plate part 320 is formed. In particular, since the upper and lower end plate portions 320 may have the same shape, they can be manufactured in one such process.

  Thereafter, the end plate portions 320 are respectively arranged on both surfaces of the laminated portion 330, and the convex portions of the positioning projections 321a of the end plate portion 320 are inserted into the through-hole portions 371 of the laminated portion 330 to be engaged and positioned. Do. After that, for example, in a state where the laminated portion 330 and the end plate portion 320 are fastened by the bolt 401 and the nut 402 and are in close contact with each other by a known method described in Patent Document 1 shown in FIG. The insulating layer P is formed on the surface of the stator core 13 by painting or electrodeposition. Thereafter, the nut and the bolt are removed to form the stator core 13 fixed by the insulating layer P as shown in FIG. Further, as shown in FIG. 4B, each stator core 13 can be partitioned using a plurality of spacers 403, and a plurality of sets of stator cores 13 can be efficiently temporarily fixed by bolts 401 and nuts 402. The laminated portion 330 is integrated in advance by dowel crimping, and the end plate portion 320 and the laminated portion 330 are positioned and temporarily fixed by the positioning portion, so that the plate shape of the stator core 13 can be applied during painting without using a positioning jig. There is no gap in the body.

  As another example of the manufacturing method of the stator core 13, for example, if a jig for bending the extension portion 32 in advance and fixing the extension portion 32 is used, two plate-like bodies are sequentially formed from the bottom. 321, a single plate-like body 332, a plurality of plate-like bodies 331, and two plate-like bodies 321, with respect to the concave portion of the positioning convex portion 321 a of the lower plate-like body. The projections 321a for positioning on the upper plate-like body are engaged with the projections 321a for positioning on the end plate part 320 to the through-holes 371 of the laminated part 330, and the lower plate A method is also possible in which the convex portions of the dowels 331a are simultaneously pressed into the concave portions of the hole portions 332a or the dowels 331a and the respective portions are positioned and fixed by caulking once. Further, the plate-like body 321 in a planar state is laminated in this manner, and after fixing by dowel caulking with the positioning projections 321a, the extension plate 32 is formed to manufacture the end plate 320. Good.

By the way, in this Embodiment, the lamination | stacking part 330 and the end-plate part 320 are stuck on the inner peripheral side of the stator core 13 using a volt | bolt, a nut, etc. For this reason, warpage or the like occurs at the end of the end plate portion 320, that is, at each tooth 13a, and a gap is generated. In the present embodiment, in order to prevent such inconvenience, the end plate portion 320 has a curved shape as shown in FIG. That is, in the present embodiment, the end plate portion 320 is curved so that the surface on which the convex portion of the positioning projection 321a is formed is concave. Then, the positioning projection 321 a of the end plate 320 curved in this way is inserted into and engaged with the through hole 371 of the stacked unit 330. Thereby, the adhesion strength between the laminated portion 330 and the end plate portion 320 at the end portion of the stator core 13 is increased, and the generation of a gap can be prevented.

(Embodiment 2)
FIG. 5 is a perspective view of stator core 53 of the motor according to Embodiment 2 of the present invention.
The overall configuration of the motor in the second embodiment is the same as that in the first embodiment, and a detailed description thereof is omitted.

  As shown in FIG. 5, the stator core 53 has a predetermined shape in a plate-like body sandwiched between upper and lower (two pieces including the outermost layer) plate-like bodies among a plurality of laminated plate-like bodies. It has the adhering part 36 arrange | positioned in the circumferential direction and the teeth 13a vicinity by the space | interval, and each plate-like body is adhering to this adhering part 36 by dowel crimping. Then, on the inner peripheral side of the innermost portion S of the coil 16 winding arm portion T of the stator core 53, the plate shape of the upper and lower surfaces (two each including the outermost layer) among the plurality of stacked plate-like bodies. A positioning portion 57 is formed between the body and the plate-like body sandwiched therebetween. While aligning by the positioning portion 57, the upper and lower surface plates (including two outermost layers) and the plate member sandwiched therebetween are powder-coated as shown in FIG. Alternatively, the insulating layer P is formed and fixed by electrodeposition coating.

  The difference from the first embodiment shown in FIGS. 2 and 3 is that a notch 53a is formed in the inner peripheral portion of the stator core 53 attached to the housing 19, and a positioning part 57 is formed in the notch 53a. is there.

  Next, a detailed configuration of the stator core 53 in the motor of the present embodiment will be described.

  FIG. 6 is a diagram showing the configuration of the stator core 53. 6A shows a configuration example when the main part of the stator core 53 is separated, and FIG. 6B shows a configuration example when the main part of the stator core 53 is integrated. .

As shown in FIG. 6 (a), the stator core 53 of the motor 12 of the present embodiment is arranged so as to sandwich the laminated portion 530 formed of a plurality of plate-like bodies and both sides of the laminated portion 530. And two end plate portions 520. The stacked portion 530 is formed by integrating and stacking a plurality of first plate-like bodies 531 and one second plate-like body 532. The cutout portion is formed in the inner peripheral portion of the first plate-like body 531 and one second plate-like body 532 so that the cutout portion 53a is formed in the inner peripheral portion where the stator core 53 is attached to the housing 19. Is formed.
The notch 53a is formed on the inner peripheral side of the innermost part S of the arm T on which the coil 16 of the stator core 53 shown in FIG. 5 is wound.

The end plate portion 520 is provided to form the end plate as described above. The end plate portion 520 has an extension portion 52 as an end plate and projects toward a surface opposite to the direction in which the extension portion 52 extends. Thus, a positioning projection 521a is formed to engage with the notch 53a of the laminated portion 530. In the present embodiment, an example in which each of the upper and lower end plate portions 520 is constituted by two plate-like bodies 521 is given. Then, similarly to the first embodiment, two plate-like bodies 521 are laminated, and the positioning protrusions 521a of the upper plate-like body with respect to the recesses of the positioning protrusions 521a of the lower plate-like body. The convex portion of the laminated portion 530 is engaged with the notched portion 53a for positioning the convex portion of the positioning projection 521a of the lower plate-like body. In addition, a bent portion that engages with the notched portion 53a is formed at a position corresponding to the notched portion 53a of the laminated portion 530 on the inner peripheral portion of the end plate portion 520, and this bent portion may be used as a positioning projection 521a. good.

  Further, as shown in FIG. 6B, the laminated portion 530 includes a plurality of first plate-like bodies 531 having a dowel 531a at the position of the fixing portion 36 in FIG. And a second plate-like body 532 having a hole 532a at the same position as the dowel 531a. Then, with the plate-like body 532 at the bottom, a predetermined number of plate-like bodies 531 are sequentially stacked, and the convex portion of the dowel 531a is press-fitted into the hole 532a of the lower plate-like body or the concave portion of the dowel 531a. And dowel caulking. Thereby, the laminated portion 530 fixed by the fixing portion 36 is formed. In addition, by inserting a plate-like body in which a hole 532a is formed instead of the dowel 531a like the second plate-like body 532 among a plurality of plate-like bodies constituting the laminated portion 530. When the stacked portions 530 are continuously formed, the stacked portions 530 can be separated by the second plate-like body 532. Further, by changing the setting of the insertion position of the second plate-like body 532 with respect to the plurality of first plate-like bodies 531, the laminated portion 530 having a different laminated thickness can be easily manufactured.

  Further, the plate-like body 531 and the plate-like body 532 constituting the laminated portion 530 are cut out at the same position on the inner peripheral portion so that the cutout portion 53a is formed in the inner peripheral portion where the stator core 53 is attached to the housing 19. The part is formed. Further, the cutout portion 53a is formed on the inner peripheral side with respect to the dowel 531a and the hole portion 532a and on the inner peripheral side with respect to the innermost portion S of the arm portion T around which the coil 16 of the stator core 13 is wound. The engaging portion engages with the positioning projection 521a.

  Further, as shown in FIG. 6B, the positioning projection 521a of the end plate 520 is inserted and engaged with the notch 53a formed in the stacked portion 530, so that the stacked portion 530 and the end portion are connected to each other. The plate portion 520 is positioned and the stator core 53 is temporarily fixed. That is, the notch 53a formed in the laminated portion 530 and the positioning projection 521a of the end plate portion 520 are formed so as to be in the same position on a plane so that they can be engaged with each other. By engaging, the positioning portion 57 as shown in FIG. 5 is obtained.

  Note that the positioning projections 521a of the end plate portion 520 and the cutout portions 53a of the laminated portion 530 constituting the positioning portion 57 can be positioned with respect to each other as long as there are two or more locations. Alternatively, it is desirable to form three places. In the present embodiment, two points are formed at point-symmetric positions.

  Then, as shown in FIG. 6B, the end plate portion 520 is positioned from the upper and lower surfaces of the laminated portion 530 formed by laminating and fixing the plate-like bodies 531 and 532 at a position that does not hinder the flow of magnetic flux. The insulating layer P is formed on the exposed surfaces of the laminated portion 530 and the end plate portion 520 by powder coating, electrodeposition coating, or the like in the state of being overlapped and adhered by the method shown in FIG. Form. In the present embodiment, the insulating layer P is formed on the entire surface of the stator core 53 except for the portion where the stator core 53 is attached to the housing 19 as shown in FIGS. 1 and 6B. If it is formed on the side facing the coil 16 of the arm part T and the extension part 52 around which the coil 16 is wound, the electrical insulation between the stator core 53 and the coil 16 can be secured. The insulating layer P may not be formed.

  Thus, the laminated portion 530 and the end plate portion 520 are fixed by the insulating layer P, and the stator core 53 is completed.

As described above, the structure of the stator core 53 is configured as shown in FIGS. 5 and 6 so that the laminated portion 530 is formed in advance and the end plate portion 520 and the laminated portion 530 do not interfere with the flow of magnetic flux. By performing powder coating or electrodeposition coating in the state where the positioning is performed and temporarily fixed, the fixing to the laminated portion 530 and the insulating treatment can be performed simultaneously. Accordingly, the end plate portion 520 and the laminated portion 530 can be fixed and insulated by a simple process without causing magnetic saturation and without using a positioning jig for the laminated portion 530 and the end plate portion 520.
Moreover, since each end plate part 520 arrange | positioned so that both surfaces of the lamination | stacking part 530 may be pinched | interposed can each be made into the same shape, it can produce in the same production process and can improve the efficiency of productivity. Further, since the stator core 53 can be formed by one dowel crimping with respect to the dowels 531a of each plate-like body 531, the productivity efficiency can be increased also by this. Furthermore, since a method of fixing or positioning only with the dowel 531a and the positioning projection 521a is used, problems such as bending and bending are unlikely to occur, and thereby quality can be improved.

  In the above description, the upper and lower end plate portions 320 and 520 have been described with an example in which they are configured by two plate-like bodies. However, the end plate portions 320 and 520 are one plate-like body. Alternatively, it may be composed of a plurality of plate-like bodies.

  According to the present invention, it is possible to provide a motor that improves the quality of the manufacturing process and improves the quality. Therefore, the present invention is suitable for a motor used in an electronic apparatus such as a laser printer or a laser copying machine.

Sectional drawing of the motor in Embodiment 1 of this invention Perspective view of stator core of same motor (A) The figure of the structural example when the stator core main part is isolate | separated, (b) The figure of the structural example when the stator core main part is integrated. (A) The figure which showed the jig | tool which temporarily fixes a stator core and throws into a coating process, (b) The figure which showed using a plurality of spacers and temporarily fixing each stator core and throwing it into a painting process The perspective view of the stator core of the motor in Embodiment 2 of this invention (A) The figure of the structural example when the stator core main part is isolate | separated, (b) The figure of the structural example when the stator core main part is integrated.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Wiring board 12 Motor 13, 53 Stator core 13a Teeth 14 Rotor 14a Top surface 15 Magnet 16 Coil 17 Bearing 18 Drive shaft 19 Housing 20 Hall IC
32, 52 Extension part 33 Magnetic pole base part 36 Adhering part 37, 57 Positioning part 53a Notch part 320, 520 End plate part 330, 530 Laminating part 321, 331, 332, 521, 531, 532 Plate body 321a, 521a For positioning Protruding part 331a, 531a Dowel 331b, 332a, 532a Hole part 371 Through-hole part 401 Bolt 402 Nut 403 Spacer P Insulating layer S Deepest part T Coiled arm part

Claims (5)

A magnet including a stator core having a plurality of magnetic poles arranged on the outer periphery and a rotor rotatably arranged on the outer periphery of the stator, and a magnet magnetized with different polarities at predetermined intervals on the inner periphery of the rotor The outer peripheral end of the magnetic pole is formed with an extension extending in a direction substantially parallel to the magnet from both sides of the magnetic pole base toward the outside,
The stator core is provided with a product layer portion has the extension, and a pair of end plates disposed on both sides of the laminated portion,
The laminated portion is
A plurality of first plate-like bodies having a concavo-convex portion which is a concave portion by forming a convex portion on one surface and the other surface on the other surface,
It consists of one second plate-like body having the same shape as the first plate-like body and having a hole at the position of the convex portion,
The plurality of first plate-like bodies are sequentially stacked while pressing the convex portions of the individual first plate-like bodies into the concave portions of the other first plate-like bodies, and Of the first plate-like body, the convex portion of the first plate-like body of the outermost layer is a laminated portion that is press-fitted into the hole of the second plate-like body and integrated. ,
A positioning projection is formed at a position on the inner peripheral side of the innermost portion of the coil winding portion of the end plate portion, and the positioning is provided at a position corresponding to the positioning projection of the end plate portion in the laminated portion. Forming a second hole or notch to be engaged with the projecting protrusion, and engaging the positioning protrusion of the end plate with the second hole or notch of the laminated portion. While aligning with the laminated part, both the sides of the laminated part were sandwiched and temporarily fixed by the pair of end plate parts, and the laminated part and the end plate part were fixed by a powder coating film or an electrodeposition coating film. A motor characterized by that. Said end plate portion, the motor according to claim 1 in which the surface of the projecting portions for positioning are formed, characterized in that the curved advance so that the concave. The motor according to claim 1, wherein the other surface of the positioning projection of the end plate portion is a recess formed by forming the positioning projection. A main body case, a driven body provided in the main body case, and a motor connected to the driven body are provided, and the motor according to any one of claims 1 to 3 is used as the motor. Electronics. A method of manufacturing a stator core having a plurality of magnetic poles on an outer peripheral part, and having an extension part bent at a substantially right angle from both sides of the base part of the magnetic pole toward the outside at the outer peripheral end part of the magnetic pole,
A plurality of first plate-like bodies each having a first dowel and a first hole formed on the inner peripheral side of the first dowel;
One second plate-like body having a second hole formed at the same position as the first hole and a third hole formed at the convex portion of the first dowel. When,
A second dowel formed at the same position as the first hole and the second hole, and the extended portion having an outer peripheral end bent in a direction opposite to the convex portion of the second dowel. And a third plate-like body curved in advance so that the surface on which the convex portion of the second dowel is formed is concave,
And a preparation process to create each
At least one sheet of the third plate-like body is aligned with the position of the second doweled convex portion and the second hole on the surface of the second doweled convex portion side. Arranging the second plate-shaped body of
A plurality of the first plate-like bodies are arranged on the second plate-like body by aligning the positions of the convex portions of the first dowels and the third hole portions,
On the first plate-like body, at least one third plate-like body is arranged by aligning the position of the convex portion of the second dowel and the first hole portion, and the whole Stator core laminating step to pressurize,
The manufacturing method of the stator core which has this.

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