JP4372130B2 - motor - Google Patents

Description

  The present invention relates to a motor including a stator having a yoke part and a tooth part.

  2. Description of the Related Art Conventionally, there has been known a motor including a stator in which a yoke part and a tooth part are integrally formed as one part. In general, in such a motor, the tooth portion has a plurality of teeth provided at predetermined intervals in the rotation direction, and each tooth is inserted through a coil made of a metal wire such as a copper wire. Here, the coil of the motor described above is produced by winding a metal wire around the teeth of the teeth portion by an automatic machine such as a winding machine. However, when a coil is manufactured in this way, when winding a metal wire around a tooth, it is necessary to insert a winding nozzle for holding the metal wire between adjacent teeth. For this reason, a space for inserting a winding nozzle must be left between adjacent teeth, and a coil cannot be provided in the space, so that the space factor of the coil cannot be increased. There was a problem.

  Therefore, Patent Document 1 discloses a motor including a stator in which a yoke portion and a teeth portion having a plurality of teeth are configured by independent bodies. In this motor manufacturing process, yoke plates are formed by laminating yoke plates formed with insertion grooves, and each tooth of the tooth portion is inserted into a coil already wound. Thereafter, the tooth portion is inserted into the insertion groove of the yoke portion to manufacture the stator.

By inserting the teeth of the teeth portion into the already wound coil in this way, it is not necessary to leave a space for inserting the winding nozzle for winding the coil described above between adjacent teeth. Therefore, the space in which the coil can be provided can be increased. As a result, the space factor of the coil could be improved.
JP 11-252842 A

  However, in the motor of Patent Document 1 described above, since the yoke plate is formed by laminating yoke plates each having an insertion groove formed therein, the insertion groove is formed in the yoke portion over the entire region in the rotation axis direction of the rotor. Has been. Therefore, the tooth portion inserted into the insertion groove of the yoke portion may move relative to the insertion groove due to the vibration of the motor, etc., and the tooth portion may protrude or detach from one end of the insertion groove. .

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a motor capable of suppressing the movement of the tooth portion with respect to the yoke portion while increasing the space factor of the coil. .

In order to achieve the above object, the invention according to claim 1 is a motor including a stator having a teeth portion and a yoke portion including a plurality of teeth, and a case, wherein the teeth portion and the yoke portion are respectively It consists of independent components, they are connected to each other, and at least a part of the teeth among the plurality of teeth is integrally connected to the adjacent teeth by a connecting portion, and the yoke portion includes the An insertion groove to which the tooth portion is inserted and connected and a closing wall for closing one end portion of the insertion groove are formed, and the case has a closing portion for closing the other end portion of the insertion groove, closure is a motor, characterized in that it comprises a plurality of closure ribs only formed in a part of the inner bottom surface of the case to match the position corresponding to the teeth. The closed portion includes not only a projecting configuration formed on the inner surface of the case but also a portion formed by a part of the flat inner surface of the case.

  According to a second aspect of the present invention, the yoke portion includes a first yoke plate having a closed wall portion forming the closed wall, and a second yoke portion having an insertion groove portion forming the insertion groove. The motor according to claim 1, wherein a yoke plate is laminated.

  The invention according to claim 3 is the motor according to claim 2, wherein the closing wall is formed by laminating a plurality of the first yoke plates.

  The invention according to claim 4 is characterized in that at least the end portion on the closed wall side of the tooth is connected to the adjacent tooth by the connecting portion. The motor according to item 1.

  The invention according to claim 5 is characterized in that the end face of the teeth on the closed wall side is formed to be flush with the outer end face of the closed wall. The motor according to any one of the above.

  The invention according to claim 6 is characterized in that the closing portion of the case is integrally formed so as to protrude inward from the case. It is a motor of description.

  In the invention according to claim 7, the tooth portion has a plurality of tooth segments including the plurality of teeth, and at least one closing portion of the case is provided for each of the tooth segments. It is a motor of any one of Claims 1-6 characterized by the above-mentioned.

  According to the configuration of the first aspect of the present invention, since the teeth portion and the yoke portion are constituted by independent components, the teeth of the teeth portion can be inserted into the wound coil. The rate can be improved. Further, the insertion groove of the yoke portion into which the tooth portion is inserted has one end portion closed by a closing wall and the other end portion closed by a case closing portion. Thereby, since the movement of the tooth part resulting from the vibration of the motor or the like can be suppressed, it is possible to prevent the tooth part from protruding or detached from the insertion groove.

  According to the configuration of the second aspect of the present invention, since the yoke portion has a structure in which the first yoke plate and the second yoke plate are laminated, eddy current can be suppressed. Thereby, the loss of the electrical energy in a yoke part can be suppressed.

  According to the configuration of the third aspect of the present invention, since the closing wall has a configuration in which a plurality of first yoke plates are laminated, even when the yoke portion is made of a thin plate material in order to suppress eddy current, the closing wall The strength of can be increased.

  According to the configuration of claim 4 of the present invention, the end portion of the tooth on the closed wall side, that is, the end portion on the side where the tooth is first inserted into the insertion groove is connected to the adjacent tooth by the connecting portion. Even when the teeth come into contact with the yoke portion when the teeth are inserted into the insertion groove, deformation of the teeth portion can be suppressed.

  According to the configuration of the fifth aspect of the present invention, since the teeth can be thickened, the characteristics of the motor can be improved.

  According to the configuration of the sixth aspect of the present invention, compared with the case where the teeth portion is brought into contact with the entire inner surface of the case by protruding only the portion of the inner surface of the case that makes contact with the teeth and making the teeth portion contact. Better contact.

  According to the configuration of claim 7 of the present invention, by providing at least one closing portion for each tooth segment, the number of closing portions can be reduced while suppressing the movement of each tooth segment. Can be further reduced.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In this embodiment, the present invention is applied to a three-phase inner rotor type brushless motor mounted on a tire of an electric motorcycle.

  FIG. 1 is an overall perspective view of the brushless motor according to the present embodiment. 2 is a cross-sectional view taken along line AA in FIG. FIG. 3 is a perspective view of the stator attached to the case. FIG. 4 is a perspective view of the stator. FIG. 5 is a perspective view of one segment of the stator on which the stator coil is mounted. 6 and 7 are perspective views of one segment of the stator. FIG. 8 is a perspective view of the yoke segment.

  9 and 10 are plan views of the yoke plate. FIG. 11 is a perspective view of a tooth segment. 12 and 13 are plan views of the tooth plate. 14 is a cross-sectional view taken along line BB in FIG. FIG. 15 is a cross-sectional view taken along line CC in FIG. For convenience, the stator coil is omitted in FIGS. 3, 4, 6, and 7.

  As shown in FIGS. 1 and 2, the brushless motor 1 includes a case 2, a rotor 3, a shaft 4, a stator coil 5, a bus ring 6, and a stator 7.

  The case 2 includes an aluminum case portion 11 and a case portion 12 that are fixed to each other with bolts (not shown). As shown in FIG. 1, an input / output terminal 13 is provided on the outer peripheral surface of the case portion 12. In FIG. 2, the input / output terminal 13 is omitted for convenience.

  As shown in FIGS. 3 and 14, one end of a press-fit groove 23 of a yoke segment 21, 22 of the stator 7, which will be described later, is closed on the inner bottom surface (inner side surface) 12 d of the case portion 12. Ten pressing ribs (corresponding to a closing portion described in claims) 12a are formed so as to protrude integrally and extend from the outer peripheral edge to the center side. Further, as shown in FIGS. 3 and 15, a mounting portion in which a screw hole 12 b into which a fixing screw 60 for fixing the stator 7 is screwed is provided in the outer peripheral edge portion of the inner bottom surface 12 d of the case portion 12. 12c is formed in nine places.

  As shown in FIG. 2, a plurality of magnets 3 a are provided on the outer periphery of the rotor 3. A shaft 4 on which a tire is mounted is press-fitted into the inner peripheral portion of the rotor 3. The shaft 4 includes a shaft portion 4a on which a tire is mounted and a shaft portion 4b on which the rotor 3 is mounted. The shafts 4a and 4b are connected by a planetary gear 14 for reduction.

  As shown in FIGS. 2 and 5, the stator coil 5 has a configuration in which a copper wire 16 is wound around a tubular insulator 15 through which a tooth 41 is inserted. The bus ring 6 has four brass plates corresponding to the three phases and the neutral point of the stator coil 5, and connects the stator coils 5.

  Next, the stator 7 which is a characteristic part of this embodiment will be described. As shown in FIG. 3, the stator 7 is fixed inside the case portion 12 of the case 2. As shown in FIG. 3 to FIG. 7, the stator 7 includes yoke segments 21 and 22 of the yoke portion 20 and teeth segments 42 and 43 of the tooth portion 40 that are independent components, and are connected to each other. The segments 21 and 22 are connected to each other. Here, as apparent from FIG. 4, the yoke segments 21 and 22 and the teeth segments 42 and 43 have the same number and a one-to-one relationship, and the teeth segments 42 and 43 are adjacent to the adjacent yoke segments 21, It connects so that it may not straddle between 22.

  As shown in FIGS. 3 and 4, the yoke portion 20 is formed in a substantially cylindrical shape by connecting four yoke segments 21 having a substantially arc shape and one yoke segment 22 by loose fitting. Hereinafter, the yoke segment 21 will be described in detail, and the yoke segment 22 having substantially the same configuration except that the length of the rotor 3 in the rotation direction (hereinafter referred to as the rotation direction) is different will be briefly described.

  As shown in FIG. 8, four press-fitting grooves (corresponding to the insertion grooves described in the claims) 23 extending in the rotation axis direction of the rotor 3 (hereinafter referred to as the rotation axis direction) are formed on the inner peripheral side of the yoke segment 21. At the same time, a closed wall 24 is formed at one end of each press-fit groove 23 to close one end of the press-fit groove 23 and press the teeth segment 42. The press-fitting groove 23 is formed in a trapezoidal shape in which the inner peripheral side is shorter than the outer peripheral side in order to prevent the teeth segment 42 from being detached to the inside in plan view.

  A fitting groove 25 is formed at one end of the rotation direction R of the yoke segment 21, and a fitting protrusion 26 that can be loosely fitted into the fitting grooves 25 of the adjacent yoke segments 21, 22 is formed at the other end. ing. In addition, the fitting groove 25 and the fitting protrusion 26 are loosely fitted in a state where, for example, a gap of about 0.03 mm is formed between the fitting groove 25 and the fitting protrusion 26 in the loose fitting portion. Yes. Then, by fitting the fitting projections 26 of the yoke segments 21, 22 adjacent to the fitting grooves 25 of the yoke segments 21, 22, the yoke segments 21, 22 are connected by loose fitting to form the yoke portion 20. Is done.

  Two guide portions 27 for positioning the stator 7 in contact with the inner surface of the outer peripheral portion 12 e of the case portion 12 are formed on the outer peripheral portion of the yoke segment 21. Further, the guide portion 27 is formed with a partial arc-shaped recess 28 through which a fixing screw 60 for fixing the stator 7 is passed. The case portion 12 is formed with a partially arcuate recess (not shown) that is circular when combined with the recess 28 at a position corresponding to the recess 28.

  Each yoke segment 21 has two types of yoke plates (corresponding to the first yoke plate in the claims) 29 shown in FIGS. 9 and 10, and yoke plates (second claims in the claims). (Equivalent to a yoke plate) 30 is laminated. On the yoke plates 29 and 30, the fitting groove 25, the fitting protrusion 26, the guide part 27, the fitting groove part 25a constituting the concave part 28, the fitting protrusion part 26a, the guide part part 27a, and the concave part are provided. 28a is formed. Further, the yoke plate 29 is formed with a closing wall portion 24 a constituting the closing wall 24, and the yoke plate 30 is formed with a press-fit groove portion 23 a constituting the press-fit groove 23. In each yoke segment 21, two yoke plates 29 are laminated, and 50 yoke plates 30 are laminated thereon and caulked in a state where the yoke plates 29 and 30 are fixed. That is, each closing wall 24 is constituted by a closing wall portion 24 a of two yoke plates 29.

  Next, the yoke segment 22 will be briefly described with reference to FIG. The yoke segment 22 is provided with two press-fitting grooves 23 and two closing walls 24, and accordingly, the length in the rotation direction R is shorter than that of the yoke segment 21. The yoke segment 22 also has a structure in which a yoke plate having a closed wall portion 24a and a yoke plate (not shown) having a press-fit groove portion 23a are laminated.

  As shown in FIGS. 3 and 4, the tooth portion 40 has 18 teeth 41, and includes four tooth segments 42 and one tooth segment 43. Hereinafter, the tooth segment 42 will be described in detail, and the tooth segment 43 having substantially the same configuration except that the length in the rotation direction R is different will be briefly described.

  As shown in FIG. 11, the tooth segment 42 includes four teeth 41 and a connecting portion 44. Each tooth 41 includes a press-fit protrusion 45, a rectangular column-shaped coil support portion 46 inserted through the stator coil 5, and a tip portion 47 provided on the inner side of the stator coil 5. The press-fitting protrusion 45 is formed in a shape that can be press-fitted into the press-fitting groove 23 of the yoke part 20 without a gap. The width of the press-fitting protrusion 45 in the rotational direction R is formed to be smaller than the width of the coil support part 46 in the rotational direction R so that the press-fitting protrusion 45 does not become an obstacle when inserted into the stator coil 5. ing.

  The tip portion 47 is formed in a flat plate shape having the same thickness in the rotation axis direction as the coil support portion 46 and having a width in the rotation direction R wider than that of the coil support portion 46. In each tooth segment 42, a part in the rotational axis direction of the end part 47 in the rotation direction R of the tip part 47 of the tooth 41 is connected to a corresponding part of the tip part 47 of the adjacent tooth 41 by the connecting part 44. Are integrally formed. As shown in FIGS. 3 and 4, a gap 48 is formed between the tip portions 47 of the teeth 41 of the adjacent tooth segments 42. The inner peripheral surface of the tip portion 47 is formed in a planar shape having a radial vector in the rotation direction R as a normal vector. Thereby, on the inner peripheral surface of the tip portion 47, the distance between the rotor 3 and the both ends in the rotation direction R where the change in the magnetic field lines is large during rotation is the distance between the center part and the rotor 3 in the rotation direction R where the change in the magnetic field lines is small. Longer than.

  As shown in FIG. 11, three connecting portions 44 are provided between the tip portions 47 of adjacent teeth 41. The three connecting portions 44 between the teeth 41 have both ends and a central portion of the tip portion 47 in the rotation axis direction so that a space is formed between the connection portions 44 in the rotation axis direction in the radial direction of the stator 7. Are formed at predetermined intervals.

  The teeth segment 42 has a configuration in which two types of tooth plates 49 and a tooth plate 50 made of an iron plate of about 0.5 mm shown in FIGS. 12 and 13 are laminated. The tooth plate 49 is formed with four tooth portions 41a constituting the teeth 41 and the connecting portion 44, and three connecting portion portions 44a for connecting them. On the other hand, the tooth plate 50 includes only a tooth portion 41 a constituting the tooth 41. In each teeth segment 42, two teeth plates 49, 23 teeth plates 50, two teeth plates 49, 23 teeth plates 50, and two teeth plates 49 are sequentially stacked in the stacking direction. The teeth plates 49 and 50 are fixed by caulking. That is, each connecting portion 44 is constituted by a connecting portion portion 44 a of two teeth plates 49. In each layer in the stacking direction, a total of four teeth plates 50 are arranged one by one at positions corresponding to the four teeth 41, and the layer in which these four plates are arranged is one layer, and 23 in the stacking direction. Layers are stacked.

  Next, the tooth segment 43 will be briefly described with reference to FIG. The teeth segment 43 has only two teeth 41, and is formed so that the length in the rotation direction R is shortened accordingly. The teeth segment 43 also has a structure in which a tooth plate on which the tooth portion 41a and the connecting portion portion 44a are formed and a tooth plate (not shown) including only the tooth portion 41a are stacked.

  Next, a state where the stator 7 is mounted on the case portion 12 of the case 2 will be described with reference to FIGS. 3, 14, and 15.

  As shown in FIG. 14, the portion where the closing rib 12 a is formed in the case portion 12 is formed at one end portion of the press-fitting groove 23 of the yoke portion 20 in a state of being fixed by a fixing screw 60 (see FIG. 15). The one end surface of the teeth 41 is pressed by the closed wall 24, and the other end surface of the teeth 41 is pressed by the closing rib 12 a of the case portion 12 provided on the other end side of the press-fitting groove 23. Thereby, detachment | leave of the teeth part 40 with respect to the yoke part 20 can be prevented.

  As shown in FIG. 3, only 10 closing ribs 12a are formed for 18 teeth 41, but the closing ribs 12 and 43 are pressed by the two closing ribs 12a. Since the 12a is arranged, it is possible to prevent the teeth segments 42 and 43 from being detached even with the ten closing ribs 12a.

  Further, as shown in FIG. 3, at the portion where the guide portion 27 is formed on the yoke portion 20, the outer peripheral surface of the guide portion 27 abuts on the inner surface of the outer peripheral portion 12 e of the case portion 12, and the yoke portion 20 is positioned. Has been. Further, as shown in FIG. 15, the fixing screw 60 inserted through the concave portion 28 of the guide portion 27 is screwed into the screw hole 12 b formed in the case portion 12. Thereby, the yoke part 20 is fixed to the case part 12 together with the tooth part 40.

  Next, the manufacturing process of the brushless motor will be briefly described focusing on the assembly and attachment processes of the stator.

  First, a yoke plate 29 constituting the yoke segment 21 shown in FIG. 9 is manufactured by punching an iron plate having a thickness of about 0.5 mm with a die. Next, a region corresponding to the closed wall portion 24a of the yoke plate 29 is punched out to produce the yoke plate 30 in which the press-fitting groove portion 23a shown in FIG. 10 is formed. Then, the yoke plates 21 and 30 are caulked in a laminated state to produce the yoke segment 21 shown in FIG. Similarly, the yoke segment 22 is also produced.

  Next, the teeth plates 49 and 50 constituting the teeth segment 42 shown in FIGS. 12 and 13 are manufactured by punching out an iron plate having a thickness of about 0.5 mm using a die. And the teeth segment 42 shown in FIG. 11 is produced by caulking the teeth plates 49 and 50 in a laminated state. Similarly, the teeth segment 43 is also produced.

  Next, as shown in FIG. 5, after the coil support portion 46 of the tooth 41 is inserted through the stator coil 5 in which the copper wire 16 is already wound around the insulator 15, the teeth 41 of the tooth segment 42 (43) The press-fitting protrusion 45 is press-fitted into the press-fitting groove 23 of the yoke segment 21 (22) from the open end side where the closing wall 24 is not formed, thereby connecting the teeth segment 42 (43) and the yoke segment 21 (22). . Next, the open end side where the closing wall 24 is not formed is opposed to the inner bottom surface 12d of the case portion 12, and the guide portion 27 of the yoke segment 21 (22) is brought into contact with the inner surface of the outer peripheral portion 12e of the case portion 12. The yoke segment 21 (22) is arranged together with the teeth segment 42 (43) in a state where the yoke segment 21 (22) is positioned so that the screw hole 12b of the case portion 12 coincides with the concave portion 28 of the guide portion 27.

  Thereafter, the other teeth segments 42 and 43 and the yoke segments 21 and 22 are also press-fitted and connected sequentially to a predetermined position, and the adjacent yoke segments 21 and 22 are connected to the fitting groove 25 and the fitting protrusion 26. Are loosely fitted and connected. Next, after all the yoke segments 21 and 22 and the tooth segments 42 and 43 are arranged and connected to the inside of the case portion 12, the fixing screws 60 inserted through the concave portions 28 of the yoke segments 21 and 22 are inserted into the screw holes 12b. The stator 7 is fixed to the case portion 12 by screwing.

  Thereafter, other parts such as the rotor 3 and the shaft 4 are attached to the case 2 to complete the brushless motor 1.

  As described above, in the brushless motor 1 according to the present embodiment, the yoke portion 20 and the tooth portion 40 are configured as independent components, so that the teeth 41 of the teeth portion 40 are inserted into the already wound stator coil 5. Therefore, the space factor of the stator coil 5 can be improved.

  Further, the press-fitting groove 23 of the yoke part 20 into which the press-fitting protrusion 45 of the teeth part 40 is press-fitted is closed at one end by the closing wall 24 and closed at the other end by the closing rib 12a of the case part 12. In the state of being fixed by the fixing screw 60, the teeth 41 can be pressed by one or both of the closing wall 24 and the closing rib 12a. Thereby, since the movement of the teeth part 40 resulting from a motor vibration etc. can be controlled, it can prevent that the teeth part 40 protrudes or detaches | leaves from the press-fit groove 23.

  Moreover, since the yoke part 20 has the structure where the yoke plates 29 and 30 were laminated | stacked, an eddy current can be suppressed. Thereby, the loss of the electrical energy in the yoke part 20 can be suppressed. Even if the yoke plate 29 is made of a thin iron plate in order to suppress the eddy current, the closing wall 24 is formed by laminating two yoke plates 29, so that the strength of the closing wall 24 can be secured. it can.

  Further, the yoke portion 20 is formed by two types of yoke plates 29 and 30. After the yoke plate 29 is produced by punching an iron plate with a die, the region corresponding to the closing wall 24 is further punched to press-fit the groove 23. Since the yoke plate 30 can be manufactured by forming the yoke plates 29 and 30, the yoke plates 29 and 30 can be easily manufactured.

  In addition, the closing rib is not formed on the entire inner surface of the case portion 12, but the closing rib 12a is formed by projecting only a part of the inner bottom surface 12d so as to correspond to the teeth 41. Can be pressed. Furthermore, the closing rib 12a is not provided corresponding to all the teeth 41, but the closing rib 12a is arranged so that each of the tooth segments 42 and 43 is pressed by the two closing ribs 12a. Since the number of the closing ribs 12a can be reduced while suppressing the movement, the material constituting the case portion 12 can be further reduced. As a result, the material cost of the case 2 can be reduced and the weight of the case 2 can be reduced.

  As mentioned above, although this invention was demonstrated in detail using embodiment, this invention is not limited to embodiment described in this specification. The scope of the present invention is determined by the description of the claims and the scope equivalent to the description of the claims. Hereinafter, modified embodiments in which the above-described embodiment is partially modified will be described.

  In the above-described embodiment, an example in which the present invention is applied to an inner rotor type three-phase brushless motor of an electric motorcycle has been described. However, the present invention is applied to other types of motors used in other electric bicycles, home appliances, and the like. It is also possible to do.

  Further, the numbers of the yoke segments 21 and 22 and the tooth segments 42 and 43 can be changed as appropriate.

  Further, the number and positions of the connecting portions 44 formed on the tooth segments 41 and 42 can be changed as appropriate. However, as in the tooth segment 42A shown in FIG. 16, it is preferable to form a connecting portion 44 at the end of the tooth segment 42A on the closing wall 24 side of the yoke segment 21. By configuring in this way, even when the number of connecting portions 44 is reduced, the connecting portion 44 is formed at the end of the tooth segment 42A that is first inserted into the press-fit groove 23, so that the strength can be increased. it can. Thereby, even if the teeth segment 42A contacts the yoke segment 21 when inserted into the press-fit groove 23, the deformation of the teeth segment 42A can be suppressed.

  Further, in the above-described embodiment, as shown in FIGS. 14 and 15, a step is formed between the upper end surface of the closing wall 24 and the upper end surface of the teeth 41 of the tooth segment 42. As shown in FIG. 3, the upper end surface of the closing wall 24 and the upper end surface of the teeth 41B of the tooth segment 42B may be configured to be in the same plane. The teeth segment 42B is formed by closing the teeth segment 51 as shown in FIG. 18 having a teeth portion 41Ba and a connecting portion 44a from which a portion constituting the press-fitting protrusion is removed from the teeth plate 49 shown in FIG. It can be manufactured by laminating the same number (two) of yoke plates 29 on the wall 24 side. By configuring the upper end surface of the closing wall 24 and the end surface of the teeth 41B of the tooth segment 42B to be on the same plane in this manner, the teeth segment 41B becomes thicker, and thus the motor characteristics can be improved. .

It is a whole perspective view of the brushless motor by this embodiment. It is sectional drawing along the AA line in FIG. It is a perspective view of the stator with which the case was mounted | worn. It is a perspective view of a stator. It is a perspective view of 1 segment of the stator with which the stator coil was mounted | worn. It is a perspective view of 1 segment of a stator. It is a perspective view of 1 segment of a stator. It is a perspective view of a yoke segment. It is a top view of a yoke board. It is a top view of a yoke board. It is a perspective view of a teeth segment. It is a top view of a teeth board. It is a top view of a teeth board. It is sectional drawing along the BB line in FIG. It is sectional drawing along CC line in FIG. It is a figure at the time of inserting the teeth segment of a modification into a yoke segment. FIG. 15 is a view corresponding to FIG. 14 including a tooth segment of another modified example. It is a top view of the teeth board which comprises the teeth segment of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Brushless motor 2 Case 3 Rotor 4 Shaft 5 Stator coil 7 Stator 11, 12 Case part 12a Closure rib 20 Yoke part 21, 22 Yoke segment 23 Press-fit groove 23a Press-fit groove part 24 Closed wall 24a Closed wall part 25 Fitting groove 26 Fit Joint portion 27 Guide portion 28 Recess 29, 30 Yoke plate 40 Teeth portion 41, 41B Teeth 42, 42A, 42B, 43 Teeth segment 44 Connection portion 45 Press-fit protrusion 46 Coil support portion 47 Tip portion 48 Gap 49, 50, 51 Teeth plate 60 fixing screw

Claims (7)

In a motor including a stator having a teeth portion and a yoke portion including a plurality of teeth, and a case,
The teeth portion and the yoke portion are each composed of independent components, and they are connected to each other.
At least some of the teeth among the plurality of teeth are integrally formed by being connected to the adjacent teeth by a connecting portion,
The yoke part is formed with an insertion groove into which the teeth part is inserted and connected, and a closing wall for closing one end of the insertion groove,
The case has a closing portion that closes the other end of the insertion groove,
It said closure unit has a motor, characterized in <br/> have a plurality of closed ribs only formed in a part of the inner bottom surface of allowed by the case match the position of the teeth.   The yoke portion is formed by laminating a first yoke plate in which a closing wall portion constituting the closing wall is formed and a second yoke plate in which an insertion groove portion constituting the insertion groove is formed. The motor according to claim 1.   The motor according to claim 2, wherein the closing wall is formed by stacking a plurality of the first yoke plates.   The motor according to any one of claims 1 to 3, wherein at least an end of the teeth on the closed wall side is connected to the teeth adjacent to the teeth by the connecting portion.   5. The motor according to claim 1, wherein an end surface of the teeth on the closed wall side is formed to be flush with an outer end surface of the closed wall.   The motor according to claim 1, wherein the closing portion of the case is integrally formed so as to protrude inward from the case. The teeth portion has a plurality of teeth segments including the plurality of teeth.
The motor according to claim 1, wherein at least one closing portion of the case is provided for each tooth segment.

Images