JP2009165319A - Motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a motor that strikes a balance between a function of pressurizing a rotary shaft of a rotor and a function of pressing a bearing plate in the motor having a biasing member for biasing the rotary shaft of the rotor. <P>SOLUTION: In the motor 2 comprising the rotor 23 having the rotary shaft 231; a stator 211 disposed on the outer peripheral side of the rotor 23; and the biasing member 1 disposed on one end side in the axial direction of the stator 211 and biasing the rotor 23 in the axial direction, the biasing member 1 is formed of a body part 10 mounted on the stator 211 and an biasing part 14 for biasing the rotor 23, and the thickness of the biasing part 14 is formed thinner than that of the body part. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a motor, and particularly preferably relates to a motor including an urging member on at least one end side in the axial direction of a stator.

  A conventionally known general stepping motor includes, for example, a rotor having a permanent magnet and a rotating shaft, a stator having pole teeth and a winding coil, and other predetermined members (Patent Documents 1 and 2). reference). And as shown in the said patent document 1 and the patent document 2, there exists a thing which has the urging member (for example, leaf | plate spring) which urges | biases the rotating shaft of a rotor to the axial direction (each figure of patent document 1). 2, see FIG. 1 of Patent Document 2).

  Such an urging member is an urging member formed of a flat plate material as described in Patent Document 1 and Patent Document 2, respectively, and is one end side of the stator (the rotor's rotation shaft is outside the motor). Provided on the non-projecting side). Then, the urging portion cut and raised from the flat plate material is pressed by bringing the urging portion into contact with the end of the rotation shaft of the rotor or the bearing, thereby urging the rotation shaft of the rotor.

  By the way, this plate-like urging member has a function to pressurize the rotating shaft of the rotor by the urging portion cut and raised from the plate-like plate material, and also prevents the bearing from falling off the stator by the flat plate portion. It has the function of. However, if the plate-like urging member has a function of pressurizing the rotating shaft of the rotor and a function of pressing to prevent the bearing from falling off, the following problems occur.

  Since this plate-like urging member has a function of applying pressure to the rotating shaft of the rotor, it needs to be molded so that the urging portion can be elastically deformed. However, if the plate-shaped urging member is formed to a thickness that can be elastically deformed, the function of the flat plate portion that holds the bearing becomes insufficient. That is, since it is necessary to reduce the plate thickness, the strength for holding the bearing is insufficient.

  On the other hand, if the plate-like urging member has a function of preventing the bearing from falling off, it is necessary to increase the thickness of the plate-like urging member to increase the strength. However, when the plate thickness is increased, the plate thickness of the urging portion is also increased, and the function of applying pressure to the rotor rotation shaft may be impaired. That is, the plate thickness of the urging portion becomes too thick, and the urging portion may not function as a spring.

  In view of the above situation, the problem to be solved by the present invention is that a motor having a biasing member that biases the rotor rotation shaft is compatible with both a function of pressurizing the rotor rotation shaft and a function of pressing the bearing plate. It is providing the motor which can aim at.

JP 2005-57991 A JP 2006-129649 A

  In order to solve the above-described problems, the present invention provides a rotor having a rotation shaft, a stator disposed on the outer peripheral side of the rotor, and one end side of the stator in the axial direction so as to attach the rotor in the axial direction. In the motor including a biasing member that biases, the biasing member includes a main body portion attached to the stator and a biasing portion that biases the rotor, and the thickness of the biasing portion is the thickness of the main body portion. The gist is that it is formed thinner than the thickness.

  According to such a structure, the thickness of the urging | biasing part of an urging member is formed thinner than the thickness of a main-body part. Therefore, the urging portion can pressurize the rotating shaft of the rotor without impairing the function of the spring. Further, the main body portion can maintain the strength necessary for pressing the bearing plate. Thus, it is possible to achieve both the pressurization of the rotating shaft of the rotor and the function of fixing the bearing plate.

  Here, it is preferable that the main body portion and the urging portion are formed and integrated from plate materials having different thicknesses. According to such a configuration, it becomes easy to adjust the spring constant of the urging portion while maintaining the necessary strength of the main body portion.

  The stator is provided with a bearing plate having a bearing portion that rotatably supports the rotating shaft of the rotor, and the bearing plate is restricted from moving in the axial direction by the body portion of the biasing member. It is preferable. According to such a configuration, it is possible to prevent the bearing plate and the rotor from falling off and falling off.

  The main body portion of the biasing member includes a fixing portion that fixes the biasing member to the stator and a bearing pressing portion that restricts the movement of the bearing plate, and the bearing pressing portion extends from the fixing portion to the axis. It is preferable to have a bag-like portion protruding outward in the direction. The bag-like portion is more preferably formed in a lattice shape and elastically deformable. According to such a configuration, since the bag-like portion is arranged so as to cover the end face of the bearing plate, even if the bearing plate penetrates the bearing holding portion and moves to the axial direction side, the bearing plate is dropped. In addition, it is possible to prevent the rotor from coming off.

  It is preferable that the main body portion and the biasing portion are fixed by caulking. Moreover, it is preferable that the said fixing | fixed part is being fixed to the said stator by laser welding.

  According to the present invention, the urging portion of the urging member is formed thinner than the main body. Therefore, the urging portion can pressurize the rotating shaft of the rotor without impairing the function of the spring. Further, the main body portion can maintain the strength necessary for pressing the bearing plate. Thus, it is possible to achieve both the pressurization of the rotating shaft of the rotor and the function of fixing the bearing plate.

  Embodiments of the present invention will be described below in detail with reference to the drawings.

  First, the structure of the motor (motor provided with the said urging | biasing member) 2 concerning embodiment of this invention is demonstrated.

  FIG. 1 is a diagram schematically showing a configuration of a motor 2 according to an embodiment of the present invention. FIG. 1A is a partial cross-sectional view of a motor 2 according to an embodiment of the present invention, and FIG. 1B is a side where a biasing member 1 is joined to the motor 2 according to an embodiment of the present invention. It is the top view seen from the end surface.

  As shown in FIGS. 1A and 1B, a motor 2 according to an embodiment of the present invention includes a rotor 23 provided with a rotating shaft 231 and a rotor 23 disposed on the outer peripheral side of the rotor 23 and having an inner periphery. A stator 21 provided with a rotor arrangement hole 26 for arranging 23, a bearing plate 22 attached to the opposite output side of the stator 21 to support the rotating shaft 231, and one end side in the axial direction L of the stator 21 (in this embodiment, And an urging member 1 for urging the rotor 23 arranged on the output side in the axial direction L.

  The rotor 23 includes a rotating shaft 231 and a permanent magnet 232. As shown in FIG. 1A, the permanent magnet 232 is fixed to the base end side of the rotating shaft 231 (the side opposite to the side that outputs rotational power). In this permanent magnet 232, N poles and S poles are alternately magnetized in the circumferential direction of the rotating shaft 231. The rotating shaft 231 has a lead screw formed on the outer peripheral side of the portion protruding from the output side (stator 21). The rotation shaft 231 is supported in the radial direction on the base end side by the bearing plate 22 and supported on the output side by a bearing or the like (not shown).

  The stator 21 has a first stator set 211 and a second stator set 212 at positions facing the permanent magnet 232 on the outer peripheral side. The first stator set 211 and the second stator set 212 are disposed so as to be stacked in the axial direction L of the rotating shaft 231 of the rotor 23. That is, the stator 21 has a two-layer structure including the first stator set 211 and the second stator set 212. In addition, the stator 21 is formed with a rotor arrangement hole 26 for arranging the rotor 23 in the central portion thereof. When the rotor 23 is arranged, the inner peripheral surface of the stator 21 and the rotor 23 (permanent magnet 232). The outer peripheral surface has a predetermined gap.

  The first stator set 211 and the second stator set 212 have inner stator cores 2111, 2121, coil bobbins 2114, 2124 around which drive coils 2113, 2123 are wound, and outer stator cores 2112, 2122, respectively. These coil bobbins 2114 and 2124 are disposed so as to be sandwiched between the inner stator cores 2112121 and the outer stator cores 2112, 2122.

  Each of the inner stator cores 2111, 2121 and the outer stator cores 2112, 2122 is formed with a plurality of pole teeth 2115, 2125 which are erected in the axial direction L at equal intervals on the inner peripheral edge thereof. More specifically, as shown in FIG. 2, the outer stator core 2112 has an axial direction L from the inner periphery of the rotor arrangement hole 26 (in FIG. 2, the side opposite to the paper surface, and the left side in FIG. 1A). In addition, five pole teeth 2115 are formed upright, and a recess 215 that is recessed in the radial direction is formed between each pole tooth 2115. Although not shown in detail, the inner stator cores 2111, 2121 and the outer stator core 2122 are similarly formed with five pole teeth 2115, 2125 standing upright from the inner peripheral edge in the embodiment of the present invention. A recess 215 that is recessed in the radial direction is formed between each of the pole teeth 2115 and 2125.

  A plurality of pole teeth 2115 and 2125 formed respectively on the inner stator core 2111 and the outer stator core 2112 and on the inner stator core 2121 and the outer stator core 2112 are formed on the inner peripheral side of each of the coil bobbins 2114 and 2124 so as to alternately mesh with each other. .

  That is, in the motor 2 according to the embodiment of the present invention, a plurality of pole teeth 2115 are formed on the inner stator core 2111 and the outer stator core 2112 of the first stator set 211, and the coil bobbin 2114 is formed on the outer periphery of each pole tooth 2115. An annular drive coil 2113 is disposed via the. Similarly, a plurality of pole teeth 2125 are formed on the inner stator core 2121 and the outer stator core 2122 of the second stator set 212, and an annular drive coil 2123 is formed on the outer periphery of each pole tooth 2125 via a coil bobbin 2124. Arranged. An insulating film is formed on the surfaces of these drive coils 2113 and 2123. A rotor arrangement hole 26 in which the rotor 23 (permanent magnet 232) can be disposed is formed in each stator set 211, 212 (that is, the entire stator 21).

  The outer peripheral edges of the outer stator cores 2112 and 2122 are bent so as to cover the outer periphery of the drive coils 2113 and 2123, and each function as a motor case. Hereinafter, portions of the outer stator cores 2112 and 2122 that cover the outer periphery of the drive coils 2113 and 2123 are referred to as a first motor case 2116 and a second motor case 2126, respectively. The first motor case 2116 and the second motor case 2126 are formed into a cylindrical shape by drawing, and in the present embodiment, an opening 216 that is cut out to a predetermined size is formed on the side wall surface. ing. Therefore, as shown in FIG. 1B, the motor 2 is formed in a so-called oval shape.

  The motor 2 according to the embodiment of the present invention is connected to another device on the output side end surface of the outer stator core 2122 that is one end side in the axial direction L of the stator 21 (the end surface on the side from which the rotating shaft 231 of the rotor 23 protrudes to the outside). A metal mounting plate 24, which is a member for mounting on the metal, is fixed by welding. Specifically, the laser is spot-irradiated from the joint portion 11 (that is, the peripheral portion) of the mounting plate 24 to the end face of the outer stator core 2122, and the joint portion 11 (that is, the peripheral portion) of the mounting plate 24 is mainly locally applied. Dissolve. That is, the melted portion of the joining portion 11 functions as a joining member with the outer stator core 2122, thereby joining the attachment plate 24 to the end surface with the outer stator core 2122. As described above, the position where the laser is irradiated is the joint portion 11 and is preferably set so as to have a substantially uniform interval at least in the circumferential direction. The mounting plate 24 has a through hole through which the output side of the rotating shaft 231 (portion protruding from the stator 21) passes.

  A terminal block 25 is fixed to the outer peripheral edges of the inner stator cores 2111, 2121. Terminal pins 251 are provided on the terminal block 25. The terminal block 25 is fixed to the inner stator cores 2111, 2121 by insert molding, press-fitting, or the like. In the embodiment of the present invention, the terminal block 25 is formed integrally with the coil bobbins 2114, 2124. The terminal pin 251 is made of, for example, a metal material and is fixed to the terminal block 25 by press fitting or the like. The terminal pins 251 fixed to the terminal block 25 are entangled with the end portions of the windings of the drive coils 2113 and 2123.

  A bearing plate 22 that rotatably supports the rotating shaft 231 of the rotor 23 is disposed on the outer stator core 2112 that is one end side in the axial direction L of the stator 21 (the side on which the rotating shaft 231 of the rotor 23 does not protrude outside). The The bearing plate 22 is made of, for example, a resin material. The bearing plate 22 includes a bearing portion 221 that is a cylindrical portion capable of supporting the base end portion (the end portion on the side where the permanent magnet 232 is disposed) of the rotating shaft 231 of the rotor 23 in the radial direction, and an outer stator core. 2112 and a flange portion 222 that is a plate-like portion that can be fitted (press-fitted). Then, the outer stator cores 2112 and 2122 are fitted (press-fitted) into the stator 21 from one end side (the side on which the rotating shaft 231 of the rotor 23 does not protrude).

  As shown in FIG. 1A, a part of the bearing portion 221 extends from the substantially central portion of the flange portion 222 into the rotor arrangement hole 26 of the stator 21. The flange portion 222 is disposed by being fitted to one end side of the outer stator core 2112 (the side on which the rotating shaft 231 of the rotor 23 does not protrude) by press-fitting or the like. Specifically, as shown in FIG. 2, the flange portion 222 is formed in a disk shape, and is interposed between the plurality of pole teeth 2115 of the outer stator core 2112 described above in the concave portion 215 that is recessed in the radial direction. The convex part 213 and the 2nd convex part 214 mounted in the end surface of the part in which the pole tooth 2115 was formed are formed. In the embodiment of the present invention, the first convex portions 213 are formed at five locations at equal intervals, and the second convex portions 214 are formed at three locations at predetermined intervals. In addition, the outer peripheral surface of the first convex portion 213 is in contact with the outer peripheral surface of the concave portion 215 of the pole tooth 2115, and the outer peripheral surface of the disc-shaped flange portion 222 is in contact with the inner peripheral surface of the pole tooth 2115. It is arranged by press fitting.

  Further, since the hollow portion 223 that is not filled with resin is formed in the disc-shaped flange portion 222, the urging portion 14 of the urging member 1 described later can be disposed in the stator 21.

(Description of biasing member 1)
FIG. 3 is a diagram schematically showing the configuration of the urging member 1 disposed in the motor according to the embodiment of the present invention. FIG. 1A is a plan view of the urging member 1, and FIG. 1B is a cross-sectional view taken along line AA in FIG.

  This urging member 1 shown in FIG. 3 is a thin metal member such as SUS attached to one end side in the axial direction L of the stator 21 of the motor 2 according to the embodiment of the present invention. And while pressing down the bearing board 22 of the motor 2 concerning embodiment of this invention, it has a function which applies a pressure to the rotating shaft 231 of the rotor 23. FIG.

  As shown in FIG. 3, the biasing member 1 is a biasing member that biases the shaft end on the proximal end side of the rotating shaft 231 in the axial direction L, and is an end surface of the stator 21, that is, an end surface of the outer stator core 2112. And a biasing portion 14 that extends inward in the radial direction of the main body 10 and biases the shaft end of the rotor 23 opposite to the output side of the rotating shaft 231. Furthermore, in this embodiment, a bag-like portion 13 formed in a region surrounded by the main body portion 10 is provided. The main body 10 is formed with a plurality of fixing portions 11 and a bearing plate pressing portion 12 having an outer diameter larger than those of the fixing portions 11.

  The urging portion 14 is a portion having a function of applying pressure in the axial direction to the rotation shaft 231 of the rotor 23 of the motor 2 according to the embodiment of the present invention. As shown in FIG. 3A, the urging portion 14 is directed radially inward from the inner peripheral surface of the main body portion 10 (the fixing portion 11 and the bearing plate pressing portion 12) formed in an annular shape. It is a tongue-like part that extends.

  The urging portion 14 is formed thinner than the main body portion 10 (formed by thin plate members each having a different thickness). In this embodiment, the urging portion 14 is constituted by a member different from the main body portion 10 and has a structure that is coupled to the main body portion 10 (the fixed portion 11 and the bearing plate pressing portion 12) by caulking, for example. Thus, by forming the urging portion 14 by a separate member from the main body portion 10, the spring constant of the urging portion 14 can be easily adjusted. Further, since the main body 10 can be made thicker than the urging portion 14, the strength of the main body 10 (strength for pressing the bearing plate 22) can be ensured.

  That is, since the strength of the main body 10 (strength for pressing the bearing plate 22) is ensured, it is possible to prevent the rotor 23 and the bearing plate from falling off when an impact or the like is applied to the rotor 23. Further, since the biasing portion 14 is formed thinner than the main body portion 10, a predetermined spring constant can be applied to the rotor 23. Further, as shown in FIG. 1 and FIG. 3B, the urging portion 14 is coupled to the main body portion in a shape bent to the rotor 23 side, so that it has a structure for applying a lateral pressure to the rotating shaft 231. Yes.

  For example, when the main body portion 10 and the urging portion 14 are formed from a single metal plate as in the prior art, each plate thickness is formed to be approximately the same. In this case, when the plate thickness is set in order to maintain the function of the main body 10 (the mechanism for preventing the bearing plate 22 and the rotor 23 from coming off), the spring constant in the urging portion 14 increases too much. The urging unit 14 cannot urge the rotating shaft 231 because the urging force is not applied. Further, when the plate thickness is set in order to maintain the function of the urging unit 14 (the function of applying a pressure to the rotor 23), the strength for pressing the bearing plate 22 and the rotor 23 in the main body unit 10 is insufficient. Further, it is impossible to prevent the bearing plate 22 and the rotor 23 from coming off. However, in this embodiment, for example, the plate thickness of the main body 10 is 0.2 mm, the plate thickness of the biasing portion 14 is about 0.08 mm, and the spring constant in the biasing portion 14 is about 100 g / mm. .

  The fixed portion 11 is a portion that joins the biasing member 1 to the stator 21 of the motor 2 according to the embodiment of the present invention. The main body portion 10 (the fixed portion 11 and the bearing plate pressing portion 12) is formed in a substantially annular shape as described above. That is, in the main body portion 10 formed in a substantially annular shape, a portion having a small radius is the fixed portion 11, and a portion having a large radius is the bearing plate pressing portion 12. In other words, the fixed portion 11 that is notched inward in the radial direction is formed in the bearing plate pressing portion 12 formed in an annular shape. It can be said that the bearing plate pressing portion 12 is a portion extending outward in the radial direction from the fixed portion 11.

  A tongue-like portion 111 extending toward the inner side of the annular ring is formed on the inner peripheral side of the fixed portion 11. That is, when it is considered that the fixed portion 11 is formed in a shape in which the outer periphery of the bearing portion pressing portion 12 is notched radially inward, the inner periphery of the portion where the outer periphery is notched (fixed portion 11) However, it can be said that it extends toward the inside in the radial direction. Thereby, the improvement of the fixing strength with respect to the stator 21 of the fixing | fixed part 11 can be aimed at. As described above, since the fixed portion 11 is formed on the inner side of the bearing pressing portion 12, it is avoided without being applied to the position of the R portion (edge portion) of the stator 21, that is, the boundary portion with the motor cases 2116 and 2126. This position can be welded as the fixed portion 11. On the other hand, since the bearing pressing portion 12 can be extended to the position on the R portion (edge) of the stator 21 or the vicinity thereof, it is possible to ensure the strength for pressing the bearing.

  As shown in FIG. 3A, the fixing portion 11 is formed at least near the base end portion of the urging portion 14. In FIG. 3A, the fixing portion 11 is provided at a total of five locations, two locations in the vicinity of the proximal end portion of the biasing portion 14 and three locations spaced from the vicinity of the proximal end portion of the biasing portion 14. The structure formed is shown. Specifically, the fixing portions 11 are provided at two locations so as to sandwich the proximal end portion of the urging portion 14. In this way, by adopting a configuration in which the fixing portion 11 is formed in the vicinity of the proximal end portion of the urging portion 14, the function of the urging portion 14 (specifically, the function of pressurizing the rotating shaft 231 of the rotor 23). ) Can be stabilized. That is, the vicinity of the base end portion of the urging portion 14 is fixed to the stator 21, so that lifting or the like from the end face of the stator 21 can be prevented or suppressed, so that the spring constant of the urging portion 14 as a whole is stabilized. Further, since the fixing portions 11 are also formed at three locations spaced from the vicinity of the base end portion of the urging portion 14, the outer periphery of the urging member 1 is fixed to the stator 21 in a substantially uniform state. Therefore, the urging member 1 can be fixed in a more suitable state.

  The bag-shaped part 13 is arrange | positioned inside the main-body part 10 (the fixing | fixed part 11 and the bearing plate holding | suppressing part 12) formed in a substantially annular shape. The bag-like portion 13 is formed in a substantially U shape in order to avoid interference with the urging portion 14. That is, it has a configuration in which the urging portion 14 is disposed inside the bag-like portion 13 formed in a substantially U shape. As shown in FIGS. 1A and 3B, the bag-like portion 13 has a shape protruding outward in the axial direction L of the motor 2. Thus, the bearing plate 22 is disposed so as to cover the end surface of the bearing plate 22, so that even if the bearing plate 22 breaks through the bearing pressing portion 12 and moves to the axial direction L side, the bearing plate 22 is dropped or the rotor 23 is moved. Omission can be prevented.

  And the bag-shaped part 13 has a structure connected with the fixing | fixed part 11 and the bearing plate holding | suppressing part 12 by the strip | belt-plate-shaped part of multiple (4 places in this form). In other words, the plurality of through-holes 15 are formed in a lattice shape so as to surround the bag-shaped portion 13 between the bag-shaped portion 13 and the fixed portion 11 and the first bearing plate pressing portion 12. Thereby, the bearing plate 22 can be directly visually recognized through the through hole 15. In addition, since the plurality of through-holes 15 are formed in the bag-like portion 13, the bag-like portion 13 can be elastically deformed in the axial direction of the rotating shaft 231 of the rotor 23 as a whole. In addition, since the bearing pressing portion 12 secures the strength of the main body portion 10 (strength for pressing the bearing plate 22), the rotor 23 and the bearing plate are prevented from dropping when an impact is applied to the rotor 23. Can be prevented.

(Method of fixing urging member and bearing plate to stator)
Next, a method for fixing the biasing member 1 and the bearing plate 22 to the stator 21 will be described. In this embodiment, the urging member 1 irradiates the fixing part 11 (peripheral part) of the urging member 1 with a laser to dissolve the fixing part 11 (peripheral part) and dissolves the fixing part 11 (peripheral part). Is used as a joining member to join one end side of the stator 21 in the axial direction, that is, to the outer stator core 2112. More preferably, the laser irradiates both the fixed portion (peripheral portion) and one end side of the stator 21. ing.

  Specifically, as shown in FIG. 2, the bearing plate 22 is press-fitted into the rotor arrangement hole 26 of the outer stator core 2112 of the stator 21. At this time, as described above, the first protrusion 213 of the bearing plate 22 fits into the recess 215 between the pole teeth 2115, and the second protrusion 214 is placed on the end face of the pole teeth 2115. Further, the outer periphery of the disc-shaped flange portion 222 is fixed so as to contact the inner peripheral edge of the pole tooth 2115.

  1A and 1B, the biasing member 1 is joined to the end surface of the stator 21, that is, the end surface of the outer stator core 2112 (the end surface on the side where the rotating shaft 231 of the rotor 23 does not protrude). Specifically, the laser is spot-irradiated from the fixed portion 11 (peripheral portion) of the biasing member 1 to the end surface of the stator 21, that is, both the fixed portion 11 (peripheral portion) and the stator 21 (outer stator core 2112). Mainly, the fixing part 11 (peripheral part) of the urging member 1 is locally dissolved (the symbol B in the figure indicates the position where the laser is irradiated). That is, the melted portion of the fixed portion 11 functions as a joining member with the stator 21, thereby joining the biasing member 1 to the end surface of the stator 21. As described above, the position where the laser is irradiated is the fixed portion 11, and at least the vicinity of the base end portion of the urging portion 14 is selected as shown in FIG. In addition, it is preferable to set so that it may become a substantially equal space | interval in the circumferential direction.

  Further, at the position of the R portion (edge) of the stator 21, that is, at the boundary portion with the motor case 2116 and 2126, since the bonding strength is insufficient, the fixing portion 11 is formed as in the configuration according to the embodiment of the present invention. Although being welded, the bearing pressing portion 12 protrudes from the fixed portion 11 and extends to the position of the R portion (edge) of the stator 21 and the vicinity thereof. Therefore, the function as a bearing retainer is also maintained or improved.

  As shown in FIG. 1B, since the fixing portion 11 is the peripheral portion of the biasing member 1, the joining state can be visually recognized from the outside. That is, since the location where the fixing portion 11 and the stator 21 are joined by the joining member of the fixing portion 11 melted by the laser is exposed to the outside, it is easy to check the joining state. Further, since the bag-like portion 13 is also formed with the lattice-like through holes 15, the state of the bearing plate 22 can be visually recognized from the outside.

  In addition, the laser irradiation time and intensity can be easily adjusted as compared with the conventional bonding configuration (configuration in which the laser is passed through the biasing member). That is, in the conventional configuration, it is necessary to adjust the laser beam so that it penetrates the biasing member but does not penetrate the stator 21. In contrast, in the embodiment of the present invention, the laser may be adjusted so as to dissolve the fixing portion (peripheral portion) 11 of the biasing member 1. Moreover, since both the fixed portion (peripheral portion) 11 and the end surface of the stator 21 (outer stator core 2112) are irradiated with laser light, the laser irradiated portion of the stator 21 is deformed by melting, or the through hole is formed. Opening can be prevented.

  When the urging member 1 is joined to the stator 21, the main body portion 10 (bearing plate pressing portion 12) and the bag-like portion 13 of the urging member 1 move the bearing plate 22 (the rotation shaft 231 of the rotor 23). (Axial movement) is restricted. That is, the bearing plate 22 and the rotor 23 are prevented from coming out of the stator 21. Further, the urging portion 14 of the urging member 1 presses the proximal end portion of the rotating shaft 231 of the rotor 23 and pressurizes the rotating shaft 231 of the rotor 23.

  Next, a method for manufacturing the motor 2 according to the embodiment of the present invention will be described.

  First, the drive coils 2113 and 2123 wound around the coil bobbins 2114 and 2124 are attached to the stator cores 2111, 2121, 2112, and 2122, respectively. Specifically, each pole tooth 2115, 2125 (each pole tooth 2115, 2125 is formed by the inner stator cores 2111, 2121 and the outer stator cores 2112, 2122) has an annular shape via coil bobbins 2114, 2124. The drive coils 2113 and 2123 are assembled (drive coil assembly process).

  Next, the terminal ends of the windings of the drive coils 2113 and 2123 are entangled with the terminal pins 251 provided on the terminal block 25 (winding linking step). After the end of the winding is entangled with the terminal pin 251, the surplus portion is cut (winding cutting step).

  Next, the rotor 23 is disposed in a region surrounded by the pole teeth 2115 and 2125 (that is, the rotor arrangement hole 26). The bearing plate 22 is press-fitted into one end side of the stator 21. Then, the urging member 1 is joined to one end side of the stator 21. The joining method and the joining structure are as described above.

(Effect of the embodiment of the present invention)
According to the embodiment of the present invention, the biasing portion 14 of the biasing member 1 is formed to be thinner than the main body portion 10. Therefore, the urging portion 14 can pressurize the rotating shaft 231 of the rotor 23 without impairing the function as a spring. Further, the main body 10 can maintain the strength necessary for holding the bearing plate 22. In this way, it is possible to achieve both the pressurization of the rotating shaft 231 of the rotor 23 and the function of fixing the bearing plate 22.

  Here, since the main body portion 10 and the urging portion 14 are formed and integrated from plate materials having different thicknesses, the spring constant of the urging portion 14 is adjusted while maintaining the required strength of the main body portion 10. Becomes easy.

  Further, a bearing plate 22 having a bearing portion 221 that rotatably supports the rotating shaft 231 of the rotor 23 is attached to the stator 21, and the bearing plate 22 is moved in the axial direction by the main body portion 10 of the biasing member 1. Therefore, it is possible to more suitably prevent the bearing plate 22 and the rotor 23 from falling off and falling off.

  The main body portion 10 of the urging member 1 includes a fixing portion 11 that fixes the urging member 1 to the stator 21 and a bearing pressing portion 12 that restricts the movement of the bearing plate 22 in the axial direction L. The bearing holding portion 12 includes a bag-like portion 13 that protrudes outward from the fixed portion 11 in the axial direction. Since the bag-like portion 13 is formed in a lattice shape and can be elastically deformed, it can not only apply an appropriate pressure to the rotor 23 and the bearing plate 22, but the bag-like portion 13 can be formed on the bearing plate 22. Since it is arranged so as to cover the end face, even if the bearing plate 22 breaks through the bearing pressing portion 12 and moves to the axial direction L side, it is possible to prevent the bearing plate 22 from dropping or the rotor 23 from coming off. it can. Furthermore, since it is formed in a lattice shape, the state of the bearing plate 22 can be confirmed even after the urging member 1 is attached.

  Furthermore, in this embodiment, the main body 11 and the urging portion 14 are composed of separate members. However, since these two members are integrated by caulking, the two members can be integrated easily and accurately. Therefore, it becomes possible to suppress impairing the functions of the main body portion 11 and the urging portion 14.

  Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the gist of the present invention.

  For example, in the said embodiment, although the biasing part 14 of the biasing member 1 showed the structure fixed to the main-body part 10 by the crimping process, the fixing method and fixing structure are not limited. For example, the structure fixed by an adhesive agent or welding may be sufficient. In addition, the main body 10 and the urging portion 14 do not necessarily have to be formed of separate members, and the main body 10 and the urging portion 14 of the urging member 1 are integrally formed from a single metal plate. It may be. In this case, for example, when the biasing portion 14 is thinner than the main body portion 10, the biasing portion 14 is stretched so as to be thinner than the main body portion 10 by drawing or the like. May be.

  Moreover, in the said embodiment, although the biasing part 14 showed the structure which biased the base end part of the rotating shaft 231 directly, between the biasing part and the base end part of the rotating shaft 231 was shown. A configuration in which another member, for example, a steel ball or the like is interposed therebetween may be used.

It is the figure which showed the structure of the motor concerning embodiment of this invention, (a) is a fragmentary sectional view, (b) is the top view seen from the side to which the said urging | biasing member is joined. It is the top view which looked at the motor concerning the embodiment of the present invention from the base end side, and is a figure showing the combined state of the bearing board and the stator except for the plate-like member. It is the figure which showed the biasing member joined to the motor concerning embodiment of this invention, (a) is a top view, (b) is the sectional view on the AA line of (a).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Energizing member 10 Main-body part 11 Fixing part 111 Tongue piece-like part 12 Bearing pressing part 13 Bag-like part 14 Energizing part 15 Through-hole 2 Motor 21 Stator 211 First stator assembly 2111 Inner stator core 2112 Outer stator core 2113 Drive coil 2114 Coil bobbin 2115 pole teeth 212 second stator set 2121 inner stator core 2122 outer stator core 2123 drive coil 2124 coil bobbin 2125 pole teeth 22 bearing plate 23 rotor 231 rotating shaft 232 permanent magnet 24 mounting plate 25 terminal block 251 terminal pin

Claims (7)

In a motor comprising a rotor having a rotating shaft, a stator disposed on the outer peripheral side of the rotor, and a biasing member disposed on one end side in the axial direction of the stator and biasing the rotor in the axial direction.
The biasing member includes a main body portion attached to the stator and a biasing portion that biases the rotor, and the thickness of the biasing portion is formed to be thinner than the thickness of the main body portion. Motor.   The motor is characterized in that the main body portion and the urging portion are formed and integrated from plate materials having different thicknesses. A bearing plate having a bearing portion that rotatably supports the rotation shaft of the rotor is attached to the stator,
3. The motor according to claim 1, wherein movement of the bearing plate in an axial direction is restricted by the main body portion of the biasing member.   The main body portion of the biasing member includes a fixing portion that fixes the biasing member to the stator and a bearing pressing portion that restricts the movement of the bearing plate, and the bearing pressing portion extends from the fixing portion to the axis. The motor according to claim 3, further comprising a bag-like portion protruding outward in the direction.   The motor according to claim 4, wherein the bag-like portion is formed in a lattice shape and is elastically deformable.   The motor according to claim 1, wherein the main body portion and the urging portion are fixed by caulking.   The motor according to claim 4, wherein the fixing portion is fixed to the stator by laser welding.

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