JP4297929B2 - Motor and motor manufacturing method - Google Patents

Description

  The present invention relates to a motor including a stator having a yoke portion and a tooth portion, and a method for manufacturing the motor.

  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, the yoke part and the tooth part are each formed in a ring shape, and then each tooth of the tooth part is inserted into a coil that has already been wound. Thereafter, the yoke part and the teeth of the tooth part are fitted together 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, a stator is manufactured by fitting together a yoke portion integrally formed with a single ring and a teeth portion integrally formed with a single ring. Therefore, there is a problem that even if any one of the annularly formed yoke portion and the annularly formed tooth portion is distorted, it cannot be fitted. In particular, as the size of the motor increases, the number of teeth increases, and as the number of fitting portions between the teeth portion and the yoke portion increases, assembly becomes difficult, which is a big problem.

  The present invention has been made to solve the above-described problems, and provides a motor and a motor manufacturing method capable of easily assembling a yoke part and a tooth part while increasing the space factor of the coil. It is an object.

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 rotor, and each of the teeth portion and the yoke portion includes: It consists of independent components, they are connected to each other, the tooth portion is formed from a plurality of tooth segments arranged in the rotation direction of the rotor, and the yoke portion is a plurality of teeth arranged in the rotation direction of the rotor The teeth segments have a plurality of teeth, and in each of the teeth segments, the plurality of teeth are formed integrally with the adjacent teeth, and the plurality of yokes are formed. The segments and the plurality of teeth segments have the same number and a one-to-one relationship. DOO is a motor which is characterized in that it is connected so as not span the plurality of yoke segments.

The invention according to claim 2 is the motor according to claim 1, wherein the adjacent yoke segments are connected by loose fitting.

The invention according to claim 3 is the motor according to claim 1, wherein a gap is formed between the adjacent tooth segments.

The invention according to claim 4 is the motor according to any one of claims 1 to 3 , wherein the teeth portion is connected to the yoke portion by press-fitting.

According to a fifth aspect of the present invention, in the tip portion of the teeth facing the rotor, the distance between both ends of the tip portion in the rotation direction and the rotor is the center portion in the rotation direction of the tip portion. The motor according to any one of claims 1 to 4 , wherein the motor is larger than a distance between the rotor and the rotor.

According to a sixth aspect of the present invention, there is provided a case on which the stator is mounted, and a guide portion that contacts the inner surface of the case is formed on the yoke portion in order to position the yoke portion. It is a motor of any one of Claims 1-5 characterized by the above-mentioned.

According to the present invention, since the teeth portion and the yoke portion are configured by independent components, the teeth of the teeth portion can be inserted into the already wound coil, and as a result, the coil space factor can be reduced. Can be improved. In addition, by configuring at least one of the tooth part and the yoke part with a plurality of segments, even if distortion occurs in one of the tooth part and the yoke part, the segment between the tooth parts or the segment of the yoke part Since the distortion can be absorbed in between, the stator can be easily assembled. In addition, by forming a part of the teeth integrally with the adjacent teeth, the number of parts can be reduced compared to the case where all the teeth are composed of separate parts, thus simplifying the assembly process. can do.

According to the present invention, since the yoke portion is constituted by a plurality of yoke segments connected by loose fitting, the connecting portion between the yoke segments can absorb the distortion of the yoke portion or the teeth portion and can be easily assembled. At the same time, it is possible to suppress the loss of magnetic field lines between the yoke segments as compared with the case where the yoke segments are separated.

According to the present invention, since the gap is formed between the tooth segments constituting the tooth portion, the gap can be easily assembled by absorbing distortion of the yoke portion or the tooth portion. It is possible to suppress the leakage of the magnetic field lines.

According to the present invention, by setting the number of yoke segments to be equal to or less than the number of teeth segments, it is possible to simplify the assembly of the yoke portion and to suppress the loss of magnetic field lines between the yoke segments. Further, by increasing the number of teeth segments and reducing the connection between the teeth, it is possible to suppress leakage of magnetic field lines between adjacent teeth segments.

According to the present invention , each tooth segment is configured not to straddle between a plurality of yoke segments, so that it is not necessary to arrange the yoke segments while holding the plurality of yoke segments. That is, since one yoke segment to which one or a plurality of teeth segments are connected can be arranged one by one, the stator can be easily assembled.

According to the present invention, since the tooth portion and the yoke portion are connected by press-fitting, loss of magnetic field lines can be suppressed between the tooth portion and the yoke portion.

According to the present invention, when the rotor is rotated, the distance between the both ends of the tip portion of the teeth having a large change in magnetic field lines and the rotor is larger than the central portion of the tip portion of the teeth having a small change in magnetic force lines. A reduction in torque can be realized.

According to the present invention, since the yoke portion can be positioned by bringing the guide portion of the yoke portion into contact with the inner surface of the case, the yoke portion can be easily disposed at a predetermined position in the case.

According to the present invention, since the stator is manufactured by connecting the plurality of yoke segments and the plurality of tooth segments, even if distortion occurs in either the yoke portion or the teeth portion, each yoke segment and each Since the distortion can be absorbed between the teeth segments, the stator can be easily assembled.

  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 12a that can be pressed 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 for the length of the rotor 3 in the rotation direction R (hereinafter referred to as the rotation direction R) will be briefly described.

  As shown in FIG. 8, four press-fitting grooves 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 one end portion, a closing wall 24 is formed which can 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 a configuration in which two types of yoke plates 29 and yoke plates 30 made of an iron plate of about 0.5 mm shown in FIGS. 9 and 10 are 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 includes 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 by 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, since the yoke part 20 is constituted by five yoke segments 21 and 22 connected by loose fitting, the distortion of the yoke part 20 and the tooth part 40 is caused by the fitting groove 25 and the fitting protrusion of the loosely fitting part. 26, the stator 7 can be easily assembled and the loss of magnetic field lines between the yoke segments 21 and 22 can be suppressed as compared with the case where the yoke segments are separated.

  Further, since the gap 48 is formed between the tooth segments 42 and 43 constituting the tooth portion 40, the stator 7 can be easily assembled by absorbing the distortion of the yoke portion 20 and the tooth portion 40 by the gap 48. At the same time, the gap 48 can suppress leakage of magnetic field lines between the tooth segments 42 and 43.

  Further, by forming the yoke portion 20 with the five yoke segments 21 and 22, the yoke plates 29 and 30 have a shape close to a straight line. For this reason, compared with the case where a circular yoke board is produced from an iron plate without dividing | segmenting into a segment, many yoke boards 29 and 30 can be produced from one iron plate, and a yield can be improved. Similarly, by forming the tooth part 40 with five tooth segments 42 and 43, the yield of the tooth plates 49 and 50 with respect to one iron plate can be improved.

  Further, the yoke segments 21 and 22 and the tooth segments 42 and 43 are configured to be one-to-one, and the teeth segments 42 and 43 are configured not to straddle between the adjacent yoke segments 21 and 22. There is no need to place and connect the yoke segments while holding the plurality of yoke segments. Therefore, since one yoke segment 21, 22 to which one tooth segment 42, 43 is connected can be arranged and connected one by one, the stator 7 can be easily assembled.

  Further, since the press-fitting protrusion 45 of the teeth segments 42 and 43 and the press-fitting grooves 23 of the yoke segments 21 and 22 are press-fitted and the teeth segments 42 and 43 and the yoke segments 21 and 22 are connected, the teeth segment 42 , 43 and the yoke segments 21 and 22 can be prevented from losing the lines of magnetic force. In particular, compared to the case where the yoke segments 21 and 22 are connected by press-fitting, the teeth segments 42 and 43 and the yoke segments 21 and 22 having many connecting points are press-fitted, so that the loss of magnetic field lines can be further suppressed. .

  Further, during the rotation of the rotor 3, the distance between the rotor 3 and the both ends of the tip portion 47 of the tooth 41 having a large change in the magnetic force line is made larger than the central portion of the tip portion 47 of the tooth 41 having a small change in the magnetic force line. Therefore, the reduction of cogging torque can be suppressed.

  Further, since the yoke portion 20 can be positioned by bringing the guide portion 27 of the yoke portion 20 into contact with the inner surface of the outer peripheral portion 12e of the case portion 12, the yoke portion 20 can be easily disposed at a predetermined position of the case portion 12. it can.

  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. For example, like the stator 70 shown in FIG. 16, the yoke portion 71 may be constituted by three yoke segments 72, and the teeth portion 75 may be constituted by three tooth segments 77 each having six teeth 76. Good. Further, as in the stator 80 shown in FIG. 17, the yoke portion 81 is constituted by four yoke segments 82 and 83, and the tooth portion 85 is divided into two tooth segments 87 each having five teeth 86. You may comprise by the two teeth segment 88 which has the four teeth 86. FIG. However, the number of yoke segments is preferably less than or equal to the number of teeth segments. As a result, the assembly of the yoke portion can be simplified and the loss of magnetic field lines between the yoke segments can be suppressed. Further, by increasing the number of teeth segments and reducing the connection between the teeth, it is possible to suppress leakage of magnetic field lines between adjacent teeth segments. Note that only one of the yoke part and the tooth part may be constituted by a segment, and either one may be constituted by one part.

  Further, in the above-described embodiment, the yoke segments 21 and 22 and the tooth segments 42 and 43 are configured to be one-to-one, but the configuration may be such that two teeth segments are attached to one yoke segment. Good. However, it is preferable to configure so that one tooth segment does not straddle two yoke segments. Thereby, the assembly process of a stator can be simplified.

  In the outer rotor type motor, the inner peripheral surface of the rotor may be formed in a polygonal cylindrical shape including a plurality of planes with the radial direction in the rotation direction as a normal vector.

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 top view of the stator by a modification. It is a top view of the stator by a modification.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Brushless motor 2 Case 3 Rotor 4 Shaft 5 Stator coils 7, 70, 80 Stator 11, 12 Case part 12a Closing rib 20, 71, 81 Yoke part 21, 22, 72, 82 Yoke segment 23 Press-fit groove 24 Closing wall 25 Fitting Joint groove 26 Fitting projection 27 Guide portion 28 Recess 29, 30 Yoke plate 40, 75, 85 Teeth portion 41, 76, 86 Teeth 42, 43, 77, 87, 88 Teeth segment 44 Connection portion 45 Press-fit projection 46 Coil Support portion 47 Tip portion 48 Gap 49, 50 Teeth plate 60 Fixing screw

Claims (6)

In a motor including a stator having a teeth portion and a yoke portion including a plurality of teeth, and a rotor,
The teeth portion and the yoke portion are each composed of independent components, and they are connected to each other.
The teeth portion is formed from a plurality of teeth segments arranged in the rotation direction of the rotor,
The yoke portion is formed by connecting a plurality of yoke segments arranged in the rotation direction of the rotor,
The teeth segment has the plurality of teeth,
Within each teeth segment, the plurality of teeth are formed integrally with the adjacent teeth ,
The plurality of yoke segments and the plurality of teeth segments have the same number and a one-to-one relationship, and the teeth segments are connected so as not to straddle the plurality of yoke segments .   The motor according to claim 1, wherein the adjacent yoke segments are connected by loose fitting.   The motor according to claim 1, wherein a gap is formed between the adjacent tooth segments. The tooth section, a motor according to any one of claims 1 to 3, characterized in that it is connected by press-fitting to the yoke portion. At the tip of the teeth facing the rotor, the distance between both ends of the tip in the rotational direction and the rotor is greater than the distance between the center of the tip in the rotational direction and the rotor. The motor according to any one of claims 1 to 4 , characterized in that: A case on which the stator is mounted;
Motor according to any one of claims 1 to 5, characterized in that contact with the guide portion on the inner surface of the case to the positioning of the yoke portion is formed in the yoke portion.

Images