JP2007306684A - Motor and manufacturing method therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve the efficiency of a motor by efficiently using a space around a coil end to reduce iron loss, while miniaturizing the motor. <P>SOLUTION: A tooth 1 is formed, by stacking magnetic plates in parallel, in a direction vertical with respect to the axial direction and the radial direction at the center for a circumferential direction. A yoke 21 is formed by vertically stacking magnetic plates to the axial direction. As the magnetic bodies, for example, an electromagnetic steel plate is used. A magnetic flux flowing through a stator flows in a substantially diameter direction in the tooth 1 and in a substantially circumferential direction in the yoke 21, respectively. Accordingly, in the tooth 1 and in the yoke 21, the magnetic flux flowing therethrough flows, in parallel in a direction where the stacked magnetic plates spread. As a result, the magnetic resistance for the magnetic flux flowing through the tooth 1 and the yoke 21 will not increase; and further, since a powder magnetic core is not used, iron loss will be reduced in the stator as a whole. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a motor, and more particularly to an improvement in a stator of a so-called radial gap type motor.

  One aspect of increasing the efficiency of the motor is to increase the magnetic flux flowing through the stator. From this viewpoint, it is desired to increase the number of turns of the coil provided in the stator. However, from the viewpoint of miniaturization of the motor, it is difficult to increase the number of turns of the coil while securing the volume of the stator core.

  Therefore, in the technique disclosed in Patent Document 1, the area of the teeth facing the rotor is increased by extending the tips of the teeth of the stator in the rotation axis direction. This is preferable in that the length along the rotation axis direction of the coil end, which is increased by increasing the number of turns of the coil, is effectively used.

  However, in the stator, a part of the magnetic flux flowing from the teeth tip to the teeth body and from the teeth body to the back yoke also flows in the rotation axis direction. Therefore, if the entire stator including the teeth is configured with a core laminated in the direction of the rotation axis, there is a problem of an increase in magnetic resistance between the laminations and an increase in eddy current. This problem becomes more prominent when the tip of the tooth is extended in the direction of the rotation axis.

  Patent Document 2 discloses a technique in which the entire stator is configured with a dust core or only the teeth are configured with a dust core. The dust core has isotropic magnetization characteristics and iron loss characteristics, and magnetic flux can easily pass through in the direction of the rotation axis.

JP 2002-354718 A JP 2005-80432 A

  However, the magnetic properties of the dust core are inferior to the magnetic properties in the plane of the electromagnetic steel sheet, and the eddy current loss is small but the hysteresis loss is large. Therefore, the iron loss characteristic is inferior to that of the electromagnetic steel sheet at the frequency of magnetic flux normally generated in the motor. In addition, the dust core has a low mechanical strength and is not suitable for mechanical coupling such as fraying.

  Therefore, an object of the present invention is to increase the efficiency of a motor by reducing iron loss. Another object is to reduce the size of the motor by effectively using the space around the coil end.

  A first aspect of the motor according to the present invention includes a plurality of teeth (1) extending in a radial direction with respect to an axial direction and wound with coils (41, 42, 43, 51, 52, 53), A stator including an annular yoke (21; 22; 23a, 23b; 24a, 24b) that magnetically connects one end (103) of the tooth, and the other end (101) opposite to the one end of the tooth; And a rotor (9) that rotates around a central axis (Q) parallel to the axial direction, facing the stator via a cylindrical air gap. Each of the teeth is formed by laminating magnetic plates in parallel in the circumferential direction or in a direction perpendicular to the axial direction and the radial direction at the center in the circumferential direction, and the yoke is in the axial direction. Magnetic plates are stacked vertically in parallel.

  A second aspect of the motor according to the present invention is the first aspect, wherein a rolled steel plate is employed for the magnetic plate constituting the teeth, and the rolling direction and the radial direction are used in agreement. It is done.

  A third aspect of the motor according to the present invention is the first aspect or the second aspect, wherein an intermediate portion (102) interposed between the one end (103) and the other end of the teeth is provided. The length (L2) along the axial direction is shorter than the other end (101).

  A fourth aspect of the motor according to the present invention is any one of the first to third aspects, wherein the yoke (21; 22; 23a, 23b; 24a, 24b) is the one end of the tooth. It has a recessed part (201; 202; 203a, 203b; 204a, 205a, 204b.205b) which fits (103).

  A fifth aspect of the motor according to the present invention is any one of the first to fourth aspects, wherein the intermediate portion (102) is located at the one end (103) on the other end (101) side. ) To the other end, and presents a curved portion (12) that expands from the radial direction toward the axial direction.

  A sixth aspect of the motor according to the present invention is the fifth aspect, wherein the rotor (9) is surrounded by the stator.

  A seventh aspect of the motor according to the present invention is any one of the first to fourth aspects, wherein the rotor (9) is surrounded by the stator, and the intermediate portion (102) is The length (L2) in the axial direction increases from one end (103) to the other end (101).

  An eighth aspect of the motor according to the present invention is any one of the first to seventh aspects, wherein the tooth (1) is the other end (103) of the magnetic plate constituting the tooth. ) Are fastened to each other by unevenness (11) provided at the end in the axial direction.

  A ninth aspect of the motor according to the present invention is any one of the first to eighth aspects, wherein the magnetic plates constituting the teeth are located at both ends in the circumferential direction. The magnetic plate (105) bends in the circumferential direction at the other end (101).

  A tenth aspect of the motor according to the present invention is any one of the first to ninth aspects, and the other end (101) exhibits an arc concentric with the rotor.

  An eleventh aspect of the motor according to the present invention is the fourth aspect thereof, wherein the recess (201) is provided over the entire axial direction of the yoke (21), and the one end (103) The axial length (L3) is equal to the axial length (Ly) of the yoke (21).

  A twelfth aspect of the motor according to the present invention is the fourth aspect thereof, wherein the recess is formed from one end in the axial direction of the yoke (21; 23a, 23b; 24a, 24b) from the axial direction. Is provided up to an intermediate position, and exhibits a seating surface (202a; 203a, 203b; 204a, 204b) at the position, and the one end (103) has its end in the axial direction in contact with the seating surface. , And fitted into the recess.

  A thirteenth aspect of the motor according to the present invention is the twelfth aspect, wherein a pair of the yokes (23a, 23b; 24a, 24b) is provided, and the seating surfaces (203a, 203b; 204a, 204b) are provided. The pair of yokes (23a, 23b) are combined in opposite directions.

  A fourteenth aspect of the motor according to the present invention is the thirteenth aspect, wherein the yoke (24a, 24b) communicates with the recess from the other end opposite to the one end in the axial direction. The teeth (1) further include a protrusion (104) that is provided at the one end (103) and fits with the communication hole.

  A fifteenth aspect of the motor according to the present invention is the fourth aspect thereof, wherein the intermediate portion (102) interposed between the one end (103) and the other end of the tooth in the axial direction is provided. The length (L2) is equal to the length (L3) of the one end (103) in the axial direction.

  A sixteenth aspect of the motor according to the present invention is any one of the first to fifteenth aspects, wherein the yoke (21) is arranged in the radial direction of the magnetic plate constituting the yoke. They are fastened to each other by an unevenness (20) provided on the opposite side to the one end (103).

  A seventeenth aspect of the motor according to the present invention is any one of the first to sixteenth aspects, wherein the rotor (9) is surrounded by the stator, and the stator has a plurality of the other ends. (101) It further has a non-magnetic material (31) that couples each other.

  An eighteenth aspect of the motor according to the present invention is any one of the first to seventeenth aspects, wherein the rotor (9) is surrounded by the stator, and the coils (41, 42, 43, 51, 52, 53) are wound by distributed winding or wave winding across the plurality of teeth, and an end portion of at least one of the coils along the axial direction is bent toward the rotor.

  A nineteenth aspect of the motor according to the present invention is the eighteenth aspect thereof, wherein the stator excludes the surface (101a) on the rotor side of the other end (101) and the one end (103). And an insulating film (32; 33) for covering the teeth (1).

  A twentieth aspect of the motor according to the present invention is any one of the eighteenth to nineteenth aspects, wherein the stator is provided on one side in the axial direction of the other end (101). It further has an annular insulator (33).

  A twenty-first aspect of the motor according to the present invention is any one of the first to twentieth aspects, wherein a length of the rotor along the axial direction is the length of the other end (101). It is not less than the length (L1) along the axial direction.

  A first aspect of the method for manufacturing a motor according to the present invention is a method for manufacturing the motor according to the first aspect of the motor according to the present invention. However, the rotor (9) is of a type surrounded by the stator. In the method, (a) a plurality of teeth (1) are arranged in an annular shape by supporting the other end (101) side, and (b) the previously wound coils (41, 42). , 43, 51, 52, 53) are inserted into the teeth through the one end (103), and (c) the one end is inserted into the yoke (21; 22; 23; 23a, 23b; 24a, 24b). The steps of magnetically connecting and (d) releasing the support on the other end side are executed in this order.

  A second aspect of the motor manufacturing method according to the present invention is a method for manufacturing the motor according to the seventeenth aspect of the motor according to the present invention. In the method, (a) connecting a plurality of the other ends (101) using a non-magnetic material (31) and fixing the teeth (1) in an annular shape; and (b) pre-winding The step of inserting the coil into the teeth through the one end (103) and the step of (c) magnetically connecting the one end with the yoke (23a, 23b) are performed in this order.

  A third aspect of the method for manufacturing a motor according to the present invention is the second aspect thereof, wherein (d) after the step (b), (d) along the axial direction of the coils (41, 42, 43). The step of bending the end portion toward the rotor side is further executed.

  In the first aspect and the third aspect of the motor manufacturing method according to the present invention, after the step (d), (e) the rotor having a permanent magnet material at a position surrounded by the other end. And (f) magnetizing the permanent magnet material with the coil to form a field magnet for the rotor.

  According to the first aspect of the motor of the present invention, the magnetic flux flowing through the stator flows in a substantially radial direction in the teeth and in a substantially circumferential direction in the yoke, and thus is parallel to the direction in which the magnetic plate spreads. Therefore, iron loss is reduced in the entire stator.

  According to the 2nd aspect of the motor concerning this invention, since the direction where a magnetic flux flows and the rolling direction correspond, the magnetic characteristic of teeth improves.

  According to the third aspect of the motor of the present invention, the coil is wound around the intermediate portion, and the other end prevents the coil from collapsing. In addition, since the length along the axial direction of the other end facing the rotor is increased, the magnetic resistance in the air gap is reduced, and the magnetic flux is efficiently linked between the stator and the rotor.

  According to the fourth aspect of the motor of the present invention, the teeth can be firmly and easily held by the yoke.

  According to the fifth aspect of the motor of the present invention, the magnetic flux flowing between the intermediate portion and the other end, and thus the rotor, becomes gentle, and the magnetic flux efficiently links between the stator and the rotor. Further, since the curved portion spreads in the vicinity of the other end, magnetic saturation is also alleviated.

  According to the sixth aspect of the motor of the present invention, the lengths of the coil ends along the axial direction are aligned in the radial direction, whereby the motor is miniaturized.

  According to the seventh aspect of the motor of the present invention, the lengths of the coil ends along the axial direction are aligned in the radial direction, thereby miniaturizing the motor.

  According to the eighth aspect of the motor of the present invention, the magnetic plates themselves are fastened to each other. In particular, since it is not necessary to provide unevenness in an intermediate portion interposed between one end and the other end of the tooth, the influence on the magnetic flux flowing through the tooth is small.

  According to the ninth aspect of the motor of the present invention, the circumferential length of the other end of the tooth is increased. Therefore, the magnetic resistance in the air gap is reduced, and the magnetic flux is efficiently linked between the stator and the rotor.

  According to the 10th aspect of the motor concerning this invention, the length of an air gap is made constant in the circumferential direction, and the magnetic flux density in an air gap is raised.

  According to the eleventh aspect of the motor of the present invention, one end of the teeth spreads the magnetic flux in the entire axial direction, so that the magnetic flux flowing through the yoke can be easily along the circumferential direction.

  According to the twelfth aspect of the motor of the present invention, the positioning of the yoke and the teeth is facilitated.

  According to the thirteenth aspect of the motor of the present invention, the teeth are firmly held in the axial direction by the yoke.

  According to the fourteenth aspect of the motor according to the present invention, the teeth are firmly held in the radial direction by the yoke.

  According to the fifteenth aspect of the motor of the present invention, in the process of winding the coil to the intermediate part, the simple process of inserting the pre-wound coil from the one end side and arranging it in the intermediate part Can be adopted.

  According to the sixteenth aspect of the motor of the present invention, the magnetic plates themselves are fastened to each other. In particular, since it is not necessary to provide unevenness at a position interposed between the other ends of the teeth, the influence on the magnetic flux flowing through the yoke is small.

  According to the seventeenth aspect of the motor of the present invention, the coil can be easily wound around the tooth before being combined with the yoke. Therefore, it is not necessary to secure the nozzle space required when the coil is wound around the teeth after the yoke is combined. Or it is easy to insert the coil wound beforehand into the teeth.

  According to the eighteenth aspect of the motor of the present invention, another coil can be easily wound between the teeth over which the coil end is bent toward the rotor side, and the axial length of the coil end is reduced. it can.

  According to the nineteenth aspect of the motor of the present invention, the insulation between the coil and the teeth is made good.

  According to the twentieth aspect of the motor of the present invention, the insulation between the coil end bent toward the rotor side and the rotor is improved.

  According to the twenty-first aspect of the motor of the present invention, the magnetic flux from the rotor effectively passes to the other end of the tooth.

  According to the first aspect and the second aspect of the method of manufacturing a motor according to the present invention, the coil is inserted into the tooth before being combined with the yoke. Therefore, when the coil is wound around the tooth after the yoke is combined. It is not necessary to secure the necessary nozzle space.

  According to the third aspect of the motor manufacturing method of the present invention, it is easy to wind another coil between the teeth over which the coil end is bent toward the rotor, and the axial length of the coil end is long. Can be reduced.

First embodiment.
FIG. 1 is a top view illustrating the configuration of the motor according to this embodiment. Specifically, it is seen from the direction along the rotation axis Q of the rotor 9. However, since the configuration of the stator is characteristic in the present embodiment, only the position of the rotor 9 is simplified here by a chain line. As the rotor 9, if a permanent magnet is used, the efficiency is high and suitable, but other types are also applicable. An induction motor or a reluctance motor can also be applied.

  The stator illustrated here has 12 slots, and is suitable for concentrated winding with 8 poles and 3 phases.

  The stator includes a plurality of teeth 1 and a yoke 21. The teeth 1 extend in a radial direction with respect to a direction parallel to the rotation axis Q (hereinafter, also simply referred to as “axial direction”). The teeth 1 are composed of a rotor-side end 101, a yoke-side end 103, and an intermediate portion 102 interposed therebetween. A coil is wound around the tooth 1 at a position described later. However, in order to avoid complication of the figure, the coil is not shown.

  The yoke 21 is annular, and fixes the plurality of teeth 1 in an annular shape while magnetically connecting the yoke side ends 103 of the plurality of teeth 1. The teeth 1 arranged in a ring form a slot by the adjacent pair.

  2 and 3 are longitudinal sectional views at circumferential positions II-II and III-III in FIG. 1, respectively, showing a cross section parallel to the rotation axis Q and perpendicular to the circumferential direction. Since the tooth 1 is not disposed at the position II-II, the tooth 1 does not appear in FIG. Position III-III is the center of one tooth 1 in the circumferential direction, and the tooth 1 appears. The sections of the rotor side end 101, the intermediate portion 102, and the yoke side end 103 are indicated by chain lines.

  Each of the teeth 1 is formed by laminating magnetic plates in parallel in the circumferential direction, or by laminating magnetic plates in parallel in a direction perpendicular to the axial direction and the radial direction at the center in the circumferential direction.

  On the other hand, the yoke 21 is formed by stacking magnetic plates in parallel perpendicular to the axial direction. As these magnetic bodies, for example, electromagnetic steel sheets are employed.

  The magnetic flux flowing through the stator flows in the teeth 1 in a substantially radial direction and in the yoke 21 in a substantially circumferential direction. Accordingly, in both the teeth 1 and the yoke 21, the magnetic flux flowing through them flows in parallel with the direction in which the laminated magnetic plates spread. Accordingly, the magnetic resistance against the magnetic flux flowing through the teeth 1 and the yoke 21 does not increase, and the powder iron core is not used, so the iron loss is reduced in the entire stator. This is effective for improving the efficiency of the motor.

  The magnetic plate constituting the tooth 1 is formed by punching an electromagnetic steel plate into the shape shown in FIG. When laminating the electromagnetic steel plates in the vertical direction, the rotor-side surface 101a of the rotor-side end 101 can be shaped into a circular arc concentric with the rotor when viewed from above. By shaping the rotor side end 101 in this way, the length of the air gap between the rotor 9 and the rotor 9 can be made constant in the circumferential direction, and the magnetic flux density in the air gap can be increased. In this case, it is desirable that the concave portion 201 described later also exhibits an arc in top view.

  FIG. 4 is a top view showing the shape of the yoke 21. The yoke 21 has a recess 201 for fitting the yoke side end 103, and the yoke 21 can firmly and easily hold the teeth 1 by such fitting. The magnetic plate constituting the yoke 21 is formed by punching an electromagnetic steel plate into the shape shown in FIG.

  Thus, since the teeth 1 and the yoke 21 are formed by laminating magnetic bodies having the same shape, the number of dies for punching the electromagnetic steel sheet is small, and the dies need not be switched, so that the productivity is good. It is.

  Further, when the yoke 21 is made of an electromagnetic steel plate, it becomes easy to mechanically hold the motor inside another device. For example, the outer periphery of the yoke 21 can be held by shrinkage, which is suitable for arrangement inside the compressor.

  In addition, when using a rolled steel plate for the magnetic plate which comprises the teeth 1, it is desirable to use the rolling direction in agreement with a radial direction. Since the direction in which the magnetic flux flowing through the tooth 1 flows matches the rolling direction, the magnetic characteristics of the tooth 1 are improved.

  The recess 201 is provided over the entire axial direction of the yoke 21, and the axial length Ly (FIG. 3) of the yoke 21 is equal to the axial length L 3 (FIG. 3) of the yoke side end 103. In such a configuration, the yoke side end 103 of the tooth 1 spreads the magnetic flux in the entire axial direction, so that the magnetic flux flowing through the yoke 21 can be easily along the circumferential direction.

  In such a configuration, it is also easy to combine the tooth 1 and the yoke 21 after winding the coil around the tooth 1. For example, when winding by concentrated winding, each of the teeth 1 can be insulated and the coil can be directly wound. By winding the coil while rotating each of the teeth 1 around the radial direction about the rotation axis Q before combining with the yoke 21, winding with aligned winding is easy.

  As described above, when the coil is wound around the tooth 1 before the teeth 1 and the yoke 21 are combined, the coil that feeds the coil is slotted compared to the case where the coils are wound after the teeth 1 and the yoke 21 are combined. There is no need to secure space for moving inside. Therefore, if the number of windings is the same, the coil can be wound around the rotor side end 101 and the coil length can be shortened. This brings about the effect of reducing winding resistance and reducing copper loss.

  The axial length L1 (FIG. 3) of the rotor side end 101 is larger than the axial length L2 (FIG. 3) of the intermediate portion 102. This is desirable in that the area of the surface 101a facing the rotor is increased, as in the technique disclosed in Patent Document 1. Moreover, it is preferable at the point which utilizes effectively the length along the rotating shaft direction of a coil end which increases by raising the frequency | count of winding of a coil. Specifically, the coil end is disposed outside the intermediate portion 102 in the axial direction. In FIG. 3, only one side in the axial direction of the coil end position CE is hatched.

  It is desirable that the air gap with the rotor 9 is substantially the same over substantially the entire axial direction of the rotor side end 101. This is to minimize the magnetic resistance. In other words, the shape of the rotor side end 101 is desirably the same along the axial direction.

  The present invention is not necessarily limited to the inner rotor type, that is, the mode in which the rotor 9 is surrounded by the stator. The inner rotor type is desirable from the viewpoint of reducing the circumferential dimension of the opening of the slot.

  However, in the case of the inner rotor type, the slot is wider at the yoke side end 103 than at the rotor side end 101. Therefore, in order to increase the number of windings of the coil, it is desirable to wind more at the yoke side end 103 than at the rotor side end 101. In this case, the coil end becomes higher on the yoke 21 side. Therefore, it is desirable that the axial length L3 of the yoke side end 103 is longer than the axial length L1 of the rotor side end 101.

  Further, it is desirable that the axial length Lr (FIG. 3) of the rotor 9 is set to be not less than the axial length L1. This is because the magnetic flux from the rotor 9 effectively passes to the rotor side end 101. By arranging the rotor 9 so as to face the rotor side end 101, the entire motor can be reduced in size.

  When a permanent magnet is used for the rotor 9, how much magnetic flux of the permanent magnet is passed to the stator greatly affects the torque. Therefore, it is particularly effective to widen the surface of the rotor 9 that faces the stator. When a permanent magnet is not used, widening the surface itself has little effect of increasing the flux linkage.

  When the number of slots is too small, for example, in the case of 3 slots or 6 slots, the circumferential dimension of the slot opening becomes too large. 9 slots or more, preferably 12 slots or more. For example, in the case of concentrated winding, 6 poles 9 slots, 8 poles 12 slots, or more, or 8 poles 9 slots, 10 poles 12 slots, etc. are desirable.

Second embodiment.
If the magnetic steel sheet employed in the first embodiment is laminated by using a so-called adhesive steel sheet coated with an adhesive insulating film, the teeth 1 and the yoke 21 can be easily configured.

  In this embodiment, the steel plate is provided with irregularities in the stacking direction, and a suitable position for a portion using a so-called “entanglement” method in which the steel plates are mutually fastened is illustrated.

  FIG. 5 is a longitudinal sectional view illustrating the configuration of the teeth 1 of the stator employed in the motor according to the present embodiment, and shows a cross section parallel to the rotation axis Q and perpendicular to the circumferential direction. The teeth 1 can constitute a stator in combination with the yoke 21 as shown in the first embodiment.

  The unevenness 11 is provided at the end of the yoke side end 103 in the axial direction. And the teeth 1 are comprised by mutually fastening the electromagnetic steel plate in which the unevenness | corrugation 11 was provided by the said unevenness | corrugation 11. As shown in FIG.

  When the electromagnetic steel plates are fastened to each other at the yoke side end 103 by the entanglement, the teeth 1 are firmly held together with the rotor side end 101 being held by the yoke 21 as shown in the first embodiment. can do. And since the unevenness | corrugation 11 is provided in the edge part about the axial direction of the yoke side end 103, it is not necessary to provide an unevenness | corrugation in the intermediate part 102, and the influence on the magnetic flux which flows into the teeth 1 is small.

  It should be noted that an entanglement may be provided near the center of the intermediate portion 102 in the axial direction as necessary. Although the magnetic flux density is high in this place, generally, the decrease in magnetic permeability due to caulking is most noticeable in the vicinity where the magnetic permeability is high (around 0.8 to 1 T), and thus the decrease in magnetic permeability is small.

  FIG. 6 is a top view of the motor showing the vicinity of the yoke-side end 103 and presents a surface perpendicular to the axial direction. The yoke 21 is provided with irregularities 20 on the opposite side of the yoke side end 103 in the radial direction of the electromagnetic steel sheet constituting the yoke 21. The yoke 21 is configured by fastening electromagnetic steel sheets provided with the unevenness 20 to each other by the unevenness 20.

  From the mechanical point of view, it is preferable to provide the concavo-convex 20 at this position and to entangle it, since it is a portion where the teeth 1 are fitted and a lamination strength is required. Further, the magnetic flux flowing between the tooth 1 and the yoke 21 passes through the yoke side end 103 and branches in the circumferential direction in the vicinity of the position where the unevenness 20 is provided (when viewed in a different direction, it merges from the circumferential direction). Therefore, from the magnetic point of view, the position where the unevenness 20 is provided is preferable because the magnetic flux density is relatively low. In other words, since it is not necessary to provide unevenness at a position interposed between the yoke side ends 103, the influence on the magnetic flux flowing through the yoke 21 is small, which is preferable.

  A suitable position for applying such an entanglement is the same even when fastening electromagnetic steel sheets using welding. In particular, when the teeth 1 are formed, it is not desirable to weld at the rotor side end 101.

Third embodiment.
FIG. 7 is a longitudinal sectional view illustrating the configuration of the teeth 1 of the stator employed in the motor according to the present embodiment, and shows a cross section parallel to the rotation axis Q and perpendicular to the circumferential direction. The teeth 1 can constitute a stator in combination with the yoke 21 as shown in the first embodiment. Also in the present embodiment, the teeth 1 and the yoke 21 are configured by laminating magnetic plates as in the first embodiment.

  The intermediate portion 102 presents a curved portion 12 that expands from the radial direction to the axial direction from the yoke side end 103 toward the rotor side end 101 on the rotor side end 101 side.

  With such a configuration, the magnetic flux flowing between the intermediate portion 102 and the rotor-side end 101 and hence the rotor 9 (FIGS. 1 and 3) becomes gentle, and the magnetic flux efficiently links between the stator and the rotor. Further, since the curved portion 12 spreads in the vicinity of the rotor side end 101, magnetic saturation is also alleviated.

  Furthermore, as described in the first embodiment, in the case of the inner rotor type, the slot on the yoke side end 103 is wider than the rotor side end 101. Therefore, the coil end tends to be higher on the yoke side end 103 side than on the rotor side end 101 side. Therefore, the length L2 increases as it goes to the rotor side end 101 while exhibiting the curved portion 12, and the height of the coil end wound around the intermediate portion 102 is set between the rotor side end 101 side and the yoke side end 103. It becomes easy to align with the side. Thus, the motor can be miniaturized by aligning the lengths of the coil ends along the axial direction in the radial direction. Further, increasing the length L2 toward the rotor side end 101 is also preferable from the viewpoint of winding the coil with aligned winding.

  FIG. 8 is a vertical cross-sectional view illustrating another configuration of the tooth 1 and shows a cross section parallel to the rotation axis Q and perpendicular to the circumferential direction. The teeth 1 can also be combined with the yoke 21 to constitute a stator.

  The intermediate portion 102 increases in length L2 from the yoke side end 103 toward the rotor side end 101. As a result, the effect of easily aligning the length of the coil end along the axial direction in the radial direction is higher than the same kind of effect by the curved portion 12, and the motor is downsized.

  As shown in FIGS. 7 and 8, irregularities 11 may be provided on these teeth 1.

Fourth embodiment.
FIG. 9 is a top view illustrating the configuration of the teeth 1 of the stator employed in the motor according to the present embodiment, and shows a surface perpendicular to the rotation axis Q. The teeth 1 can also be combined with the yoke 21 to constitute a stator as shown in the first embodiment.

  The electrical steel sheets 104 and 105 are laminated to constitute the tooth 1. However, the magnetic plates 105 are positioned at both ends in the circumferential direction, and a plurality of magnetic bodies 104 are stacked between the pair of magnetic plates 105. In FIG. 9, the magnetic plate 104 in the vicinity of the center in the circumferential direction is omitted for the sake of simplicity. The magnetic plate 105 spreads and bends in the circumferential direction at the rotor side end 101.

  With such a configuration, the circumferential length of the rotor side end 101 is increased. Therefore, the magnetic resistance in the air gap is reduced, and the magnetic flux is efficiently linked between the stator and the rotor.

  In addition, although the teeth 1 can be formed to be inclined with respect to the radial direction by shifting the stacking position, the electromagnetic steel plates 104 and 105 can also be employed in this case.

Fifth embodiment.
FIG. 10 is a top view illustrating the configuration of the motor according to the present embodiment, as viewed along the axial direction. However, in this embodiment as well, only the position of the rotor 9 is simplified by a chain line.

  The stator includes teeth 1 and a core 22. The core 22 is annular, and fixes the plurality of teeth 1 in an annular shape while magnetically connecting the yoke side ends 103 of the plurality of teeth 1.

  FIG. 11 is a top view showing the shape of the yoke 22 and shows a surface perpendicular to the rotation axis Q. FIG. FIG. 12 is a longitudinal sectional view at a position XII-XII in the circumferential direction of FIG. 10 and shows a section parallel to the rotation axis Q and perpendicular to the circumferential direction.

  The yoke 22 has a concave portion 202 for fitting the yoke side end 103, and the yoke 22 can firmly and easily hold the teeth 1 by such fitting. The magnetic plate constituting the yoke 22 is an electromagnetic steel plate punched into the shape shown in FIG. 4, and an electromagnetic steel plate punched into a shape in which the inner peripheral side is also circular without providing the recess 201 with respect to the shape of FIG. And can be constituted by two types of lamination. By such lamination, as in the first embodiment, the magnetic flux flowing in the circumferential direction in the yoke 22 and the spreading direction of the magnetic plate can be made parallel to reduce the iron loss.

  The recess 202 is provided from one end of the yoke 22 in the axial direction to a position in the middle of the axial direction, and presents a seating surface 202 at that position. Here, the seating surface 202 is perpendicular to the axial direction, but may be inclined.

  The yoke-side end 103 extends from the intermediate portion 102 to one side in the axial direction, and the end in the axial direction comes into contact with the seating surface 202 and engages with the recess 202. The length L3 along the axial direction of the yoke-side end 103 is preferably coincident with the length along the axial direction of the recess 202, but may be short. In particular, if the length L3 is equal to the length L2, there is an advantage that the coil can be easily wound around the teeth 1. This is because a coil wound in advance using another winding frame can be inserted into the intermediate portion 102 via the yoke side end 103.

  By adopting such a configuration, the seating surface 202a positions the yoke side end 103 in the axial direction, and as a result, positioning of the yoke 22 and the tooth 1 is facilitated.

  A pair of yokes 22 may be provided and combined with a shape in which the recess 22 communicates. Such an embodiment is shown in FIGS. FIG. 13 is a top view illustrating another configuration of the motor according to the present embodiment, viewed from the direction along the rotation axis Q. FIG. FIG. 14 is a longitudinal cross-sectional view at a position XIV-XIV in the circumferential direction of FIG. 13 and shows a cross section parallel to the rotation axis Q and perpendicular to the circumferential direction.

  Similarly to the seating surface 202a of the yoke 22, the concave portions of the yokes 23a and 23b have seating surfaces 203a and 203b, respectively. The yokes 23a and 23b are combined in the direction in which the seating surfaces 203a and 203b face each other to form the recess 203. The yoke-side end 103 is fitted in the recess 203. In other words, the yokes 23a and 23b sandwich the teeth 1 from both sides along the axial direction. Therefore, compared to the configuration shown in FIGS. 10 to 12, the teeth 1 can be held more firmly.

  The yoke-side end 103 employed in such a configuration can have a length L3 along the axial direction equal to the length L2 of the intermediate portion 102. Therefore, the coil wound around the tooth 1 can be wound by inserting the coil wound beforehand using another winding frame into the intermediate portion 102 via the yoke side end 103.

  The yokes 23a and 23b may be integrated. In this case, the yoke side end 103 is inserted into the recess 203 from the inner peripheral side.

Sixth embodiment.
FIG. 15 is a top view illustrating the configuration of the motor according to the present embodiment, viewed from the direction along the rotation axis Q. FIG. However, in this embodiment as well, only the position of the rotor 9 is simplified by a chain line.

  The stator includes teeth 1 and cores 24a and 24b. The cores 24a and 24b are annular, and fix the plurality of teeth 1 in an annular shape while magnetically connecting the yoke side ends 103 of the plurality of teeth 1 to each other.

  FIG. 16 is a perspective view partially showing the yoke 24a, and FIG. 17 is a longitudinal sectional view at a circumferential position XVII-XVII in FIG.

  Each of the yokes 24a and 24b has a recess, and presents seat surfaces 204a and 204b, respectively, similar to the seat surfaces 203a and 203b exhibited by the yokes 23a and 23b (FIG. 14) described in the fifth embodiment.

  The yoke 24a has a communication hole 205a that communicates with the recess from the end opposite to the one end in the axial direction (the end having the smaller radial thickness) (the end on the side where the seating surface 204a is not exposed). Yes. Similarly, the yoke 24b has a communication hole 205b.

  The tooth 1 further includes a protrusion 104 that is provided at the yoke side end 103 and engages with the communication holes 205a and 205b.

  By adopting such a configuration, it is possible to firmly hold the teeth 1 in the radial direction by the yokes 24a and 24b. In particular, since a suction force acts between the rotor 9 and the teeth 1 in the radial direction, the configuration of the present embodiment is suitable from the viewpoint of preventing the positional displacement of the teeth 1 in the radial direction.

  As described in the first embodiment, it is preferable to shape the rotor-side end 101 into an arc when viewed from above. When shaped in this way, it is desirable that the communication holes 205a and 205b also have circular arcs in top view.

  Teeth 1 according to the present embodiment can be configured by laminating magnetic plates having the cross-sectional shape shown in FIG. Further, the yokes 24a and 24b are formed by laminating two types of electromagnetic steel sheets, ie, an electromagnetic steel sheet punched into the shape shown in FIG. 15 and an electromagnetic steel sheet punched into the shape shown in FIG. Can do.

  In the case of concentrated winding, when the tooth 1 exists alone, the coil can be directly wound by turning the nozzle around the tooth 1. Or you may wind a coil, rotating the teeth 1. FIG. Alternatively, a coil wound in advance can be inserted into the teeth.

Seventh embodiment.
18 and 19 are a perspective view and a top view, respectively, illustrating the configuration of the teeth employed in the motor according to the present embodiment. In the present embodiment, the motor is an inner rotor type, and the teeth 1 are fixed in an annular shape before the coil is wound around each of the teeth 1.

  Specifically, the rotor side end 101 is supported and arranged in an annular shape. For this support, the stator has a nonmagnetic body 31 that connects the rotor side ends 101 to each other. As the nonmagnetic material 31, a mold resin can be adopted.

  By adopting such a configuration, the coil can be easily wound around the tooth 1 before being combined with the yokes 23a and 23b. And it is suitable for winding a coil by concentrated winding. Since the coil is wound in a state where the yokes 23 a and 23 b are not present, the movement of the nozzle required when the coil is wound around the teeth may reach the outer peripheral side from the yoke side end 103. In other words, it is not necessary to secure a nozzle space inside the slot.

  Further, when the coil is wound after the tooth 1 is fixed in an annular shape, the coil wound in advance can be inserted into the tooth 1. This winding method is suitable for windings in which a coil is wound over a plurality of teeth 1 such as distributed winding and wave winding, and a plurality of coil ends overlap. In this case, it is desirable that the length L3 of the yoke side end 103 is equal to the length L2 of the intermediate portion 102. Therefore, the structure shown in FIG. 14 is desirable for each shape of the teeth 1. 18 and 19 illustrate the teeth 1 having such a shape. However, even in the structure shown in FIG. 3 or FIG. 12, the coil wound in advance can be inserted into the tooth 1 if the coil is shaped after being inserted into the tooth.

  In order to hold the yoke side end 103 of the tooth 1 having such a shape, it is desirable to employ the yokes 23a and 23b (FIG. 14) described in the fifth embodiment as the yoke.

  However, even if the length L3 of the yoke side end 103 is longer than the length L2 of the intermediate portion 102 (for example, FIG. 3, FIG. 5, FIG. 7, FIG. 8), there is an advantage that it is not necessary to secure the nozzle space. Remains.

  FIG. 20 is a top view illustrating a state after the coils 41, 42, 43, 51, 52, 53 are inserted into the teeth 1 connected by the nonmagnetic material 31. FIG. The coils 41, 42, 43, 51, 52, 53 are wound by distributed winding or wave winding across the plurality of teeth 1.

  Here, a case where winding is performed on the teeth 1 constituting 12 slots with 4-pole 3-phase distributed winding (virtual winding) is illustrated. For example, the coils 41 and 51 are for the U phase, the coils 42 and 52 are for the V phase, and the coils 43 and 53 are for the W phase. The coil 41, 42, 43, 51, 52, 53 is indicated by hatching at a position where it is laid in the axial direction between two adjacent teeth 1 (slot).

  The coils 51, 52, and 53 cannot be wound between the slots unless the positions where the coil ends (end portions along the axial direction) of the coils 41, 42, and 43 exist are bypassed. Therefore, the coils 51, 52, 53 are arranged on the outer peripheral side of the coils 41, 42, 43. This almost halves the space factor in the slot.

  Alternatively, the coil ends of the coils 41, 42, 43 are separated from the teeth 1 in the axial direction to increase the space factor of the coils 51, 52, 53, and the coil ends of the coils 51, 52, 53 are replaced with the coils 41, 42, It is also conceivable to increase the space factor of the coils 41, 42, 43 by overlapping the 43 coil ends in the axial direction. However, in that case, since the coils 41, 42, 43, 51, 52, and 53 expand in the radial direction near the coil end, the dimensions of the stator including the yokes 23a and 23b become large. In addition, the coil end itself becomes longer, and the copper loss increases.

  Therefore, in the present embodiment, desirably, the coil ends of the coils 41, 42, 43 are bent toward the inner peripheral side. FIG. 21 is a top view and shows a state in which the coils 41, 42, and 43 are wound using almost the whole of the wound slots. Specifically, the coils 41, 42, and 43 shaped in advance in such a shape are inserted across a plurality of teeth 1.

  In this state, the coils 51, 52, 53 cannot be wound for the reason described above, and therefore the coil ends of the coils 41, 42, 43 are bent toward the inner peripheral side. FIG. 22 is a top view and shows a state after bending. Due to such bending, a slot at a position where the coils 51, 52, 53 are to be wound (more specifically, to be inserted) is vacated. Therefore, as shown in the top view of FIG. 23, the coils 51, 52, and 53 are wound using almost the entire slots to be wound. In this way, the space factor can be increased. Also, since the length of the coil in the axial direction is not increased, the copper loss is not increased.

  When performing the bending, it is desirable to insert the rotor before bending at least one of the axial directions. This is because the coil end protruding to the inner peripheral side by bending is much larger than the air gap between the stator and the rotor, and therefore the rotor cannot be inserted after both are bent.

  For example, when the axial length Ly of the yoke is longer than the length L1 of the rotor side end 101 (see FIG. 3), or when the length L1 is shorter than the axial length L2 of the intermediate portion 102, The stator is formed as follows.

  When the coil end is bent toward the inner peripheral side only in any one of the directions, the rotor 9 can be inserted from the opposite side along the axial direction of the rotor 9 after the coil end is bent.

  First, the rotor is assembled on the inner peripheral side of the annular array of the teeth 1 connected by the nonmagnetic material 31. At this time, the positional relationship between the stator and the rotor may be fixed. For example, it can be said that with a shaft and a bearing, a rotor is arranged at a predetermined position of the device, and only the teeth are fixed by another fixing jig. Since such a fixing method can be realized by a well-known technique, details are omitted here.

  Next, an insulator is inserted into the slot to insulate the coil from the stator. It is desirable that the insulator protrude beyond the end portion in the axial direction of the rotor. This is to obtain insulation between the bent coil end and the rotor.

  Thereafter, coils 41, 42, 43, 51, 52, 53 wound in advance are inserted into the intermediate portion 102 from the yoke 103 side. Then, the teeth 1 are fitted and held in the concave portion of the yoke.

  Alternatively, once the yoke side end 103 is held by the yoke, the coils 51, 52, 53 are bent toward the yoke side, and the coils 41, 42, 43 are bent to such an extent that the rotor can be inserted. You may return and insert a rotor. In this case, the coils 41, 42, 43 wound in advance may be bent and shaped.

  It is also conceivable to bend one side of the coil ends of the coils 41, 42, 43 to the outer peripheral side (yoke side). In this case, since either of the yokes 23a and 23b cannot be combined with the tooth 1 after the coil is wound, it is desirable to use the yokes 21 and 22. However, in this case, since the shape of the tooth 1 is longer in the length L3 than in the length L2 (see FIGS. 3 and 14), a method of inserting a coil wound in advance is not suitable.

  Of course, you may insert a rotor into the inside of the cyclic | annular arrangement | sequence of the teeth 1 connected with the nonmagnetic body 31 before winding a coil.

  FIG. 24 is a perspective view showing a modification of this embodiment, and a part thereof is omitted and omitted. FIG. 25 is a top view showing the modification, and FIG. 26 is a longitudinal sectional view at a position XXVI-XXVI in the circumferential direction of FIG.

  The stator has a non-magnetic body 31 and insulators 32 and 33 formed of mold resin. The nonmagnetic material 31 is as described above, and the insulator 32 covers the intermediate portion 102. The insulator 32 insulates the intermediate portion 102 from the coil. The yoke end 103 is preferably not covered with mold resin so as to be magnetically connected to the yoke. Further, in order not to substantially expand the air gap between the rotor and the stator, it is desirable that the rotor-side surface 101a is not covered with the mold resin.

  The insulator 33 is provided on one side in the axial direction and has an annular shape. This is to improve the insulation between the coil ends of the coils 41, 42, 43 bent as described above and the rotor.

  By integrally molding the nonmagnetic body 31 and the insulators 32 and 33 with a molding resin, a slit is provided between the adjacent nonmagnetic bodies 31. Then, the rotor side end 101 may be inserted into the slit.

  The connection between the coils 41, 42, 43, 51, 52, 53 may be performed in any process. For example, if the teeth 1 are inserted into the recesses 203 formed by the yokes 23a and 23b, the crossover wires and the lead wires can be easily fixed and routed. If it is performed before that, it is difficult to fix the jumper wire or the lead wire, or it may hit the yokes 23a and 23b.

  In addition, when the rotor is inserted into the inner peripheral side of the stator after combining the yoke and the teeth 1, the presence of the nonmagnetic material 31 is not essential. This is because, for the convenience of winding the coil, it is sufficient to support the teeth 1 in a ring shape with a jig before winding the coil. If the support by the jig is released after the yoke side 103 is held by the yoke, the rotor can be inserted thereafter. Since the jig | tool which supports the teeth 1 cyclically | annularly can be easily implement | achieved by a well-known technique, the detail is abbreviate | omitted here.

  When the rotor has a permanent magnet, it may be difficult to handle it by attracting with the stator core. Therefore, it is also preferable to configure the motor by combining the stator and the rotor without magnetizing the permanent magnet of the rotor. After that, it can be magnetized using a coil wound around the stator.

  Alternatively, a magnetized magnet may be inserted into the rotor after being assembled as a motor. In this case, an embedded magnet type is preferable to a surface magnet type so as not to hit the coil during insertion. In particular, it is desirable that there is no coil end on the axial projection surface where the magnet is disposed.

1 is a top view illustrating the configuration of a motor according to a first embodiment of the invention. It is a longitudinal cross-sectional view in the position II-II of the circumferential direction of FIG. It is a longitudinal cross-sectional view in the position III-III of the circumferential direction of FIG. It is a top view which shows the shape of the yoke used for 1st Embodiment. It is a longitudinal cross-sectional view which illustrates the structure of the teeth employ | adopted as the motor concerning the 2nd Embodiment of this invention. It is a top view which shows a part of motor concerning the 2nd Embodiment of this invention. It is a longitudinal cross-sectional view which illustrates the structure of the teeth employ | adopted as the motor concerning the 3rd Embodiment of this invention. It is a longitudinal cross-sectional view which illustrates other structures of the teeth employ | adopted as the motor concerning the 3rd Embodiment of this invention. It is a top view which illustrates the structure of the teeth employ | adopted as the motor concerning the 4th Embodiment of this invention. FIG. 10 is a top view illustrating the configuration of a motor according to a fifth embodiment of the invention. It is a top view which shows the shape of the yoke employ | adopted as the motor concerning the 5th Embodiment of this invention. It is a longitudinal cross-sectional view in the position XII-XII of the circumferential direction of FIG. It is a top view which illustrates other composition of the motor concerning a 5th embodiment of the present invention. It is a longitudinal cross-sectional view in the position XIV-XIV of the circumferential direction of FIG. It is a top view which illustrates the structure of the motor concerning the 6th Embodiment of this invention. It is a perspective view which shows partially the yoke employ | adopted as the motor concerning the 6th Embodiment of this invention. It is a longitudinal cross-sectional view in position XVII-XVII of the circumferential direction of FIG. 7 is a perspective view illustrating a configuration of teeth employed in a motor according to an embodiment of the present invention. FIG. It is a top view which illustrates the structure of the teeth employ | adopted as the motor concerning the 7th Embodiment of this invention. It is a top view which illustrates a mode after inserting a coil in teeth. It is a top view which illustrates a mode after inserting a coil in teeth. It is a top view which illustrates the mode after bending a coil end. It is a top view which illustrates a mode after inserting a coil in teeth. It is a perspective view which shows the modification of the 7th Embodiment of this invention partially. It is a top view which shows the deformation | transformation of the 7th Embodiment of this invention. It is a longitudinal cross-sectional view in the position XXVI-XXVI of the circumferential direction of FIG.

Explanation of symbols

1 Teeth 101 Rotor side end 101a Rotor side surface 102 Intermediate part 103 Yoke side end 104, 105 Magnetic plate 11, 20 Concavity and convexity 12 Curved part 201, 202, 203 Concave part 202a, 203a, 203b, 204a, 204b Seat surface 205a, 205b Communication hole 21, 22, 23a, 23b, 24a, 24b Yoke 31 Non-magnetic material 32, 33 Insulating film 41, 42, 43, 51, 52, 53 Coil 9 Rotor Q Rotating shaft

Claims (25)

A plurality of teeth (1) extending in a radial direction with respect to the axial direction and wound with coils (41, 42, 43, 51, 52, 53);
A stator including an annular yoke (21; 22; 23a, 23b; 24a, 24b) for magnetically connecting one end (103) of the tooth;
A rotor that rotates around a central axis (Q) parallel to the axial direction, facing the stator via the other end (101) opposite to the one end of the teeth and a cylindrical air gap. 9) a motor comprising:
Each of the teeth is formed by laminating magnetic plates in parallel in the circumferential direction or in a direction perpendicular to the axial direction and the radial direction in the center of the circumferential direction,
The yoke is a motor in which magnetic plates are stacked in parallel to each other perpendicular to the axial direction.   The motor according to claim 1, wherein a rolled steel plate is adopted as the magnetic plate constituting the teeth, and the rolling direction and the radial direction coincide with each other.   The intermediate portion (102) interposed between the one end (103) and the other end of the teeth has a shorter length (L2) along the axial direction than the other end (101). The motor according to claim 1.   The yoke (21; 22; 23a, 23b; 24a, 24b) has a recess (201; 202; 203a, 203b; 204a, 205a, 204b, 205b) for fitting the one end (103) of the tooth. The motor according to any one of claims 1 to 3.   The said intermediate part (102) exhibits the curved part (12) which spreads in the said axial direction from the said radial direction toward the said other end in the said other end (101) side from the said one end (103). The motor according to any one of claims 1 to 4.   The motor according to claim 5, wherein the rotor is surrounded by the stator. The rotor (9) is surrounded by the stator;
The intermediate portion (102) according to any one of claims 1 to 4, wherein the axial length (L2) increases from the one end (103) to the other end (101). The motor described.   The said teeth (1) are mutually fastened by the unevenness | corrugation (11) provided in the edge part about the said axial direction of the said other end (103) of the said magnetic board which comprises the said tooth. The motor according to any one of 7 above.   The magnetic plates (105) located at both ends in the circumferential direction among the magnetic plates constituting the teeth are bent and spread in the circumferential direction at the other end (101). The motor according to any one of 8.   The motor according to any one of claims 1 to 9, wherein the other end (101) exhibits an arc concentric with the rotor. The recess (201) is provided over the whole axial direction of the yoke (21),
The motor according to claim 4, wherein the axial length (L3) of the one end (103) is equal to the axial length (Ly) of the yoke (21). The concave portion is provided from one end of the yoke (21; 23a, 23b; 24a, 24b) in the axial direction to a position in the middle of the axial direction, and the seating surface (202a; 203a, 203b; 204a, 204b)
5. The motor according to claim 4, wherein the one end (103) is engaged with the concave portion with an end in the axial direction coming into contact with the seating surface. A pair of the yokes (23a, 23b; 24a, 24b) is provided,
The motor according to claim 12, wherein the pair of yokes (23a, 23b) are combined in a direction in which the seating surfaces (203a, 203b; 204a, 204b) face each other. The yoke (24a, 24b) further includes a communication hole (205a, 205b) communicating with the recess from the other end opposite to the one end in the axial direction.
The motor according to claim 13, wherein the teeth (1) further include a protrusion (104) provided at the one end (103) and fitted in the communication hole.   The length (L2) in the axial direction of the intermediate portion (102) interposed between the one end (103) and the other end of the teeth is the length of the one end (103) in the axial direction ( The motor according to claim 4, which is equal to L3).   The said yoke (21) is mutually fastened by the unevenness | corrugation (20) provided in the said radial direction on the opposite side to the said one end (103) of the said magnetic board which comprises the said yoke. The motor as described in any one. The rotor (9) is surrounded by the stator;
The motor according to any one of claims 1 to 16, wherein the stator further includes a non-magnetic body (31) that couples the other ends (101). The rotor (9) is surrounded by the stator;
The coil (41, 42, 43, 51, 52, 53) is wound with distributed winding or wave winding across the plurality of teeth,
The motor according to any one of claims 1 to 17, wherein an end portion of the at least one coil along the axial direction is bent toward the rotor.   The stator further includes an insulating film (32; 33) that covers the teeth (1) except for the rotor-side surface (101a) of the other end (101) and the one end (103). Item 19. The motor according to Item 18. The stator is an annular insulator (33) provided on one side in the axial direction of the other end (101).
The motor according to any one of claims 18 to 19, further comprising:   The length of the rotor along the axial direction is equal to or longer than the length (L1) of the other end (101) along the axial direction. The motor described. A method for manufacturing a motor according to claim 1, comprising:
The motor is a type in which the rotor (9) is surrounded by the stator,
(A) arranging the plurality of teeth (1) in an annular shape by supporting the other end (101) side;
(B) inserting the pre-wound coils (41, 42, 43, 51, 52, 53) into the teeth through the one end (103);
(C) magnetically connecting the one end with the yoke (21; 22; 23; 23a, 23b; 24a, 24b);
(D) A method of manufacturing a motor, wherein the step of releasing the support on the other end side is executed in this order. A method for manufacturing a motor according to claim 17, comprising:
(A) connecting a plurality of the other ends (101) using a non-magnetic material (31), and fixing the teeth (1) in an annular shape;
(B) inserting the pre-wound coil through the one end (103) into the teeth;
(C) A method of manufacturing a motor, wherein the step of magnetically connecting the one end with the yoke (23a, 23b) is executed in this order. 24. The motor according to claim 23, further comprising: (d) a step of bending the end portion along the axial direction of the coil (41, 42, 43) toward the rotor after the step (b). Production method. After step (d),
(E) disposing the rotor having a permanent magnet material at a position surrounded by the other end;
25. The step of (f) magnetizing the permanent magnet material with the coil to form a field magnet for the rotor is further executed. Manufacturing method of the motor.

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