JP2007209113A - Motor, and manufacturing and operating method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To relieve outflow/inflow of flux to the front edge of a pole, thus relieving magnetic saturation at the edge. <P>SOLUTION: An armature 1 includes an armature core 13 and a winding 14 wound around the armature core. The armature core 13 has: the pole 131 and a winding portion 133 extended in parallel to a rotating shaft; and a joint 132 jointing both of them. The winding 14 is wound around the winding portion 133. The winding portion 133 faces a field element 2 through the pole 131 in a diametrical direction to the rotating shaft. The armature 1 also includes a yoke 11. The yoke 11 magnetically shorts the winding portions 133 each other on the opposite side to the joint 132. The field element 2 has a so-called built-in magnet type structure, a magnetic field core 21, and a magnetic field magnet 22. The magnetic field magnet 22 is built in the magnetic field core 21, thus facing the pole 131 through the magnetic field core 21. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an electric motor, and more particularly to a radial gap type electric motor.

  Conventionally, a so-called radial gap type electric motor in which a gap (gap) between an armature and a stator is formed in a cylindrical shape is known. In particular, a structure has been proposed in which an armature winding is wound around a winding portion parallel to the rotation axis in the armature core, and a magnetic pole portion extending from the winding portion faces the field element. Yes. Such a structure is preferable in that a so-called axial gap type motor in which the gap between the armature and the stator is formed in a flat plate shape can also enjoy the structural advantage of the armature winding. In addition, the following patent documents 1 thru | or 3 are mentioned as literature relevant to this case.

JP 2005-110414 A Special table 2003-513599 gazette US Pat. No. 5,854,526

  However, in the above-described structure, a so-called surface magnet type in which the field magnet is exposed to the armature side is employed as the field element. When such a field element is employed, the magnetic pole portion is likely to be magnetically saturated particularly at the tip thereof.

  The present invention has been made in view of such a problem, and an object of the present invention is to provide a technique for alleviating the inflow and outflow of magnetic flux to and from the tip of a magnetic pole part and alleviating magnetic saturation at the tip.

  The electric motor according to the present invention includes an armature (1; 3; 5) and a field element (2; 4). In the first aspect, the armature is made of a magnetic material and includes a plurality of armature cores (13; 33; 50) arranged in the circumferential direction with respect to the rotation axis, and windings (14; 34a, 34b; 54). Each of the armature cores includes at least one magnetic pole portion (131; 331; 51a, 51b) extending in parallel with the rotation axis, and the field magnet in a radial direction with respect to the rotation axis via the magnetic pole portion. At least one connecting the magnetic pole part and the winding part to the winding part (133; 333; 53) facing the child and extending in parallel with the rotation axis and around which the winding is wound. And connecting portions (132; 332; 52a, 52b). The field element includes a field element core (21; 41), a field magnet (22; 42) embedded in the field element core, and opposed to the magnetic pole portion via the field element core. Have

  A second aspect of the electric motor according to the present invention is the first aspect, wherein the magnetic pole part (131; 331; 51a, 51b) extends longer than the winding part (133; 333; 53). To do.

  A third aspect of the electric motor according to the present invention is any one of the first to second aspects, wherein the armature (1; 3) is on a side opposite to the connecting portion (132; 332). And a yoke (11; 31) for magnetically short-circuiting the winding portions (133; 333) of the plurality of armature cores (13; 33).

  The 4th aspect of the electric motor concerning this invention is the 3rd aspect, Comprising: The dimension in the said radial direction of the said yoke (11; 31) is wider than the said winding part (133; 333).

  A fifth aspect of the electric motor according to the present invention is any one of the third to fourth aspects, wherein the shortest distance between the yoke (11; 31) and the magnetic pole part (131; 331) ( d1; d2) is greater than twice the distance (δ) between the field element (2; 4) and the armature (1; 3).

  A sixth aspect of the electric motor according to the present invention is any one of the third to fifth aspects, in which each of the armature cores (13; 33) is connected to the connecting portion (132; 332). It further has a projection (134; 334) connected to the winding part (133; 333) on the opposite side. The yoke (11; 31) has a recess or hole (12; 32) into which a plurality of the protrusions are inserted.

  A seventh aspect of the electric motor according to the present invention is the sixth aspect, wherein the yoke (11; 31) is composed of steel plates stacked in a direction parallel to the rotation axis.

  An eighth aspect of the electric motor according to the present invention is any one of the first to seventh aspects, wherein the field element (2) is disposed outside the armature (1).

  A ninth aspect of the electric motor according to the present invention is the eighth aspect, in which an interval (d4) between the magnetic pole portions (131) adjacent in the circumferential direction is the winding adjacent in the circumferential direction. Narrower than the interval (d5) between the parts (133).

  A tenth aspect of the electric motor according to the present invention is any one of the first to seventh aspects, and the field element (4) is disposed inside the armature (3).

  An eleventh aspect of the electric motor according to the present invention is the third aspect, in which the field element (4) is disposed inside the armature (3), and the outer periphery of the yoke (31) is The diameter (d3) is larger than the outer circumference of the windings (34a, 34b).

  A twelfth aspect of the electric motor according to the present invention is any one of the tenth to eleventh aspects, wherein the yoke (31) is located on the rotating shaft more than the outer peripheral surface of the field element (4). It extends in the radial direction to the vicinity and has an inner peripheral end (30). The distance (d6) along the rotation axis between the yoke and the magnetic pole part (331) is larger than twice the distance (δ) between the field element and the armature (3).

  A thirteenth aspect of the electric motor according to the present invention is any one of the tenth to twelfth aspects, wherein the yoke (31) is located on the rotating shaft more than the outer peripheral surface of the field element (4). It extends in the radial direction to a near position and has an inner peripheral end (30). The distance (d4) along the rotation axis between the yoke and the field element is greater than twice the distance (δ) between the field element and the armature (3).

  A fourteenth aspect of the electric motor according to the present invention is the third aspect, wherein the yoke (11; 31) is provided with a bearing hole (10; 30).

  A fifteenth aspect of the electric motor according to the present invention is any one of the first to second aspects, and in each of the armature cores (50), the connecting portions (51b, 52b) A pair is provided to be connected to the opposite side with respect to the turning part (53), and the magnetic pole parts (51a, 52a) are provided to be connected to the winding part via the pair of connecting parts. The magnetic pole portions are spaced apart from each other in the circumferential direction.

  A sixteenth aspect of the electric motor according to the present invention is the fifteenth aspect, wherein the pair of magnetic pole portions (51a, 52a) are arranged in the circumferential direction with the field element (2) and the armature ( 5) and spaced apart by more than twice the interval (δ).

  A seventeenth aspect of the electric motor according to the present invention is any one of the fifteenth to sixteenth aspects, and in each of the armature cores (50), one of the connecting portions (52a; 52b) is interposed. The shortest distance (d7) between the magnetic pole part (51a; 51b) connected to the winding part (53) and the other connecting part (52b; 52a) is the field element (2). Greater than twice the distance (δ) between the armature and the armature (5).

  An eighteenth aspect of the electric motor according to the present invention is any one of the fifteenth to seventeenth aspects, wherein the number of the armature cores (50) is a multiple of 3, and the number of poles of the field element Is 2 more or 2 less than the total number of the magnetic pole portions (51a; 51b).

  A nineteenth aspect of the electric motor according to the present invention is any one of the first to eighteenth aspects, wherein the armature (1; 3; 5) includes the connecting portion (132; 332; 51b, 52b). And a non-magnetic first ring portion (7) for fixing the magnetic pole portions (131; 331; 51a, 51b) on the opposite side to the above.

  A twentieth aspect of the electric motor according to the present invention is any one of the first to nineteenth aspects, wherein the armature (1; 3; 5) includes the connecting portion (132; 332; 51b, 52b). The non-magnetic second ring portion (8) is further included.

  A twenty-first aspect of the electric motor according to the present invention is any one of the first to twentieth aspects, wherein the winding portion (133; 333; 53) has a radial dimension that is equal to the magnetic pole portion ( 131; 313; 51a, 51b), which is thicker than the radial dimension.

  A twenty-second aspect of the electric motor according to the present invention is any one of the first to twenty-first aspects, wherein the radial thickness of the magnetic pole portion (131; 333; 51a, 51b) The side opposite to the connecting part is thinner than the part (132; 312; 52a, 52b) side.

  A twenty-third aspect of the electric motor according to the present invention is any one of the first to twenty-second aspects, and each of the armature cores (13; 33; 50) includes at least the magnetic pole part (131; 331; 51a, 52a) are composed of steel plates stacked vertically to the radial direction.

  A twenty-fourth aspect of the electric motor according to the present invention is any one of the first to twenty-second aspects, and each of the armature cores (13; 33; 50) includes at least the magnetic pole part (131; 331; 51a, 52a) are formed of steel plates stacked vertically in the circumferential direction.

  A twenty-fifth aspect of the electric motor according to the present invention is any one of the first to twenty-second aspects, and each of the armature cores (13; 33; 50) is formed of a dust core.

  A twenty-sixth aspect of the electric motor according to the present invention is any one of the first to twenty-fifth aspects, wherein the magnetic pole portions (131; 331; 51a, 52a) are inclined in the circumferential direction.

  A twenty-seventh aspect of the electric motor according to the present invention is any one of the first to twenty-sixth aspects, wherein each of the plurality of windings (14; 54) is formed of the winding part (133; 53). Each is wound in a concentrated volume.

  A twenty-eighth aspect of the electric motor according to the present invention is any one of the first to twenty-sixth aspects, wherein each of the plurality of windings (34a, 34b) includes a plurality of the winding portions (333). It is wound with distributed winding over the whole area.

  A twenty-ninth aspect of the electric motor according to the present invention is any one of the first to twenty-eighth aspects, and a rectangular wire is adopted for the windings (14; 34a, 34b; 54).

  A thirtieth aspect of the electric motor according to the present invention is any one of the first to twenty-ninth aspects, wherein the field element core (21; 41) includes at least the field magnet (22; 42). ) And the armature (1; 3; 5) are made of a dust core.

  A first aspect of a method for manufacturing an electric motor according to the present invention is a method for manufacturing a sixth aspect of the electric motor according to the present invention, in which (a) the winding (133; 333) is wound with the winding ( 14; 34a, 34b), and (b) after the step (a) is executed, the protrusion (134; 334) is inserted into the recess or hole (12; 32). Is provided.

  A second aspect of the method for manufacturing an electric motor according to the present invention is a method for manufacturing any one of the fifteenth to eighteenth aspects of the electric motor according to the present invention, wherein each of the armature cores (50) includes: It is divided in advance between at least one of the connecting portions (52a, 52b) and the winding portion (53), and the manufacturing method (a) winds the winding (54) around the winding portion. And (b) connecting the connecting portions (52a, 52b) and the winding portion (53) after the step (a) has been executed.

  A third aspect of the method for manufacturing an electric motor according to the present invention is a method for manufacturing any one of the fifteenth to eighteenth aspects of the electric motor according to the present invention, wherein each of the armature cores (50) includes: The winding portion (53) is divided in advance, and the manufacturing method includes (a) winding the winding (54) around a part of the winding portion, and (b) the step (a). After the above is executed, the method includes a step of coupling the connecting portion (52a, 52b) and the winding portion (53).

  The operating method according to the present invention is a method for operating any one of the fifteenth to eighteenth aspects of the electric motor according to the present invention, wherein the product of the number of pole pairs of the field element and the rotational speed is 400 Hz or less. .

  According to the first aspect of the electric motor according to the present invention, the magnetic pole portion can be extended also to the so-called coil end region which is a dead space in the so-called radial gap type electric motor, and the space can be effectively used. In addition, since the windings are not exposed above and below the motor, there are few spatial restrictions when the motor is attached to equipment. Since the field element core is interposed between the magnetic pole part and the field magnet, inflow and outflow of magnetic flux to the tip of the magnetic pole part is reduced, and magnetic saturation at the tip is reduced. Moreover, since reluctance torque can be used together, torque increases.

  According to the second aspect of the electric motor according to the present invention, the magnetic pole portion can be extended to a so-called coil end region which is a dead space in the so-called radial gap type electric motor, and the space can be effectively used. In addition, since the windings are not exposed above and below the motor, there are few spatial restrictions when the motor is attached to equipment.

  According to the third aspect of the electric motor of the present invention, both the reduction of the thrust force, which is an advantage of the so-called radial gap type electric motor, and the improvement of the winding space factor, which is an advantage of the so-called axial gap type electric motor, are enjoyed. . Between the winding part and the magnetic pole part on the side opposite to the coupling part, the magnetic flux is prevented from flowing in and out in a short circuit, and the armature magnetic field is easily linked to the field element.

  According to the fourth aspect of the electric motor of the present invention, the magnetic path can be shortened and the magnetic saturation can be reduced, so that the permeance of the field magnet is increased, and the magnetic flux between the field element and the armature is thereby increased. The density is improved.

  According to the fifth aspect of the electric motor of the present invention, it is possible to prevent the magnetic flux from flowing in and out between the magnetic pole part and the yoke without passing through the field element, and thus the rotation linked to the field element. Increase the magnetic flux number of the magnetic field.

  According to the sixth aspect of the electric motor of the present invention, it is possible to easily manufacture the armature by inserting the protrusion into the yoke after winding the winding around the winding portion. Can be reliably positioned and fixed.

  According to the seventh aspect of the electric motor of the present invention, manufacture is easy and the coupling strength with the protrusion is strong. Moreover, the magnetic resistance against the magnetic flux flowing in the yoke between the different armature cores is small.

  According to the eighth aspect of the electric motor of the present invention, the area of the field magnet can be widened, so the field is large.

  According to the ninth aspect of the electric motor of the present invention, the area of the magnetic pole portion facing the field element is increased, and the field magnetic flux linked to the armature is increased.

  According to the tenth aspect of the electric motor of the present invention, it becomes easy to hold the field element shaft.

  According to the eleventh aspect of the electric motor of the present invention, when the electric motor is attached to a device, shrinkage or press-fitting using a yoke can be adopted, so that the housing can be omitted.

  According to the twelfth and thirteenth aspects of the electric motor according to the present invention, since the magnetic path of the yoke can be shortened, it is easy to reduce the thickness and reduce the size.

  According to the fourteenth aspect of the electric motor according to the present invention, the positional accuracy of the shaft is improved. In particular, in the inner rotor type, the shaft can be fixed without providing a housing.

  According to the fifteenth aspect of the electric motor of the present invention, a pair of magnetic poles can be obtained with one winding, and copper loss is reduced.

  According to the sixteenth aspect of the electric motor of the present invention, it is possible to prevent the magnetic flux from flowing in and out between the magnetic pole portions without passing through the field element, and thereby to prevent the rotating magnetic field interlinked with the field element. Increase the number of magnetic flux.

  According to the seventeenth aspect of the electric motor of the present invention, the magnetic flux is prevented from flowing in and out between the magnetic pole part and the connecting part without passing through the field element, and is thus linked to the field element. Increase the number of magnetic flux of the rotating magnetic field.

  According to the eighteenth aspect of the electric motor of the present invention, the number of poles is matched between the armature and the field element, and the cogging torque can be reduced.

  According to the nineteenth aspect of the electric motor of the present invention, the magnetic pole portion is fixed, and the mechanical strength thereof is increased to prevent deformation.

  According to the twentieth aspect of the electric motor of the present invention, the connecting portion is fixed, and the mechanical strength thereof is increased to prevent deformation.

  From the magnetic pole portion, magnetic flux flows into and out of the field element through a gap between the field element and the armature. On the other hand, a lot of magnetic flux flows into and out of the winding part. Therefore, according to the twenty-first aspect of the electric motor according to the present invention, magnetic saturation in the winding portion is avoided.

  According to the twenty-second aspect of the electric motor of the present invention, the magnetic saturation at the tip of the magnetic pole part is alleviated, so that the magnetic pole part at this position can be made thin and the magnetic flux distribution is made uniform.

  According to the twenty-third and twenty-fourth aspects of the electric motor according to the present invention, the magnetic flux resistance in the extending direction of the magnetic pole portion is reduced, so that the magnetic flux leakage in the flow of the magnetic flux between the magnetic pole portion and the winding portion. Reduce.

  According to the twenty-fifth aspect of the electric motor of the present invention, even if iron loss due to magnetic flux flowing three-dimensionally occurs, this can be reduced. Moreover, it is possible to eliminate waste from the shape by adopting a three-dimensional shape.

  According to the twenty-sixth aspect of the electric motor of the present invention, a skew can be obtained and the cogging torque can be reduced without impairing the winding of the winding.

  According to the twenty-seventh aspect of the electric motor of the present invention, the circumference of the winding is shortened, the winding resistance is reduced, and high efficiency is achieved.

  According to the twenty-eighth aspect of the electric motor of the present invention, it is possible to improve the flux linkage and reduce vibration and noise. Even in the case of adopting distributed winding, which is obtained in a so-called axial gap type electric motor, the advantage that the increase in coil end is small can be enjoyed.

  According to the twenty-ninth aspect of the electric motor of the present invention, since the winding resistance is reduced, the efficiency is improved.

  According to the thirtieth aspect of the electric motor of the present invention, since the magnetic flux parallel to the rotation axis easily flows in the field element core located between the field magnet and the armature, the magnetic flux that passes through the tip of the magnetic pole part. The amount is reduced and the magnetic saturation at the tip is relaxed.

  According to the method for manufacturing an electric motor according to the present invention, the armature can be manufactured easily. In particular, according to the first aspect, the winding portion and the yoke can be reliably positioned and fixed.

First embodiment.
FIG. 1 is a sectional view partially showing a configuration of an electric motor according to a first embodiment of the present invention. In FIG. 1, the structure in a cross section including the rotation axis that is parallel to the rotation axis (not shown) is shown only on one side with respect to the rotation axis. A so-called outer rotor type motor is illustrated in which the field element 2 that functions as a rotor is opposed to the outer periphery of the armature 1 that functions as a stator.

  The armature 1 includes a plurality of armature cores 13 and a winding 14 wound around them. Each of the armature cores 13 has a magnetic pole part 131 and a winding part 133 that extend parallel to the rotation axis, and a connecting part 132 that connects both of them. The winding 14 is wound around the winding unit 133. The winding part 133 is opposed to the field element 2 in the radial direction with respect to the rotation axis via the magnetic pole part 131. The magnetic pole part 131 desirably extends longer than the winding part 133.

  The armature 1 further includes a yoke 11. The yoke 11 is on the side opposite to the connecting portion 132 and magnetically shorts the winding portions 133 to each other.

  The dimension of the yoke 11 in the radial direction is preferably wider than that of the winding part 133. The shortest distance d1 between the yoke 11 and the magnetic pole part 131 is preferably larger than twice the distance δ between the field element 2 and the armature 1. The inner peripheral end forms a hole 10. A shaft supported by the field element 2 is inserted through the hole 10 by a support mechanism (not shown). If the hole 10 is adopted as a shaft bearing hole, the positional accuracy of the shaft is improved.

  The armature core 13 further includes a protrusion 134 that is connected to the winding portion 133 on the side opposite to the connecting portion 132. On the other hand, the yoke 11 has a hole 12 into which a plurality of protrusions 134 are inserted. The hole 12 may be a recess that does not penetrate, and the position of the connection and the shape of the connection part 132 and the protrusion 134 are arbitrary.

  The field element 2 has a so-called embedded magnet type configuration, and has a field element core 21 and a field magnet 22. The field magnet 22 is embedded in the field element core 21 and faces the magnetic pole part 131 through the field element core 21.

  2, 3, 4, and 5 are cross-sectional views showing configurations of the field element 2, the armature core 13, the winding 14, and the yoke 11, respectively, and each shows a cross section perpendicular to the rotation axis Q. ing. 6 and 7 are both plan views showing the structure of the armature 1, and show cases when viewed from the connecting portion 132 side and the yoke 11 side, respectively.

  Here, a case where ten field magnets 22 are provided in the field element 2 and each form a magnetic pole is illustrated. Further, the case where 15 armature cores 13 are provided in the armature 1 is illustrated.

  The armature core 13 adopts the above-described structure, and the winding 14 is wound around the winding portion 133, so that the magnetic pole portion extends to a so-called coil end region that has become a dead space in the so-called radial gap type motor. it can. Therefore, the space can be used effectively. In addition, since the windings are not exposed above and below the motor, there are few spatial restrictions when the motor is attached to equipment.

  FIG. 8 and FIG. 9 are views schematically showing how the field generated by the field magnet 22 reaches the magnetic pole portion 131, and corresponds to the cross-sectional view shown in FIG. Here, however, the field is schematically drawn with an arrow from the field magnet 22 to the magnetic pole portion 131.

  FIG. 8 shows a conventional configuration, and a gap is formed between the magnetic pole portion 131 and the field magnet 22. Accordingly, the field φ1 also flows into and out of the tip of the magnetic pole part 131. For the following reason, it is desirable that the tip of the magnetic pole portion 131 is formed thin. Therefore, the tip is likely to be magnetically saturated.

  The magnetic pole portion 131 is given an armature magnetic field having a polarity different from that of the armature magnetic field generated on the projection 134 side of the winding portion 133 by the winding 14. Therefore, the tip of the magnetic pole part 131 cannot be thickened so as to be separated from the projection 134 side of the winding part 133. For example, it is desirable that the gap between the tip of the magnetic pole portion 131 and the protrusion 134 is larger than twice the gap length δ so that the magnetic flux does not flow in a short circuit here.

  FIG. 9 shows a case where the electric motor according to the present embodiment is employed. The tip of the magnetic pole part 131 cannot be made thick for the reasons described above. However, since the field element core 21 is interposed between the magnetic pole portion 131 and the field magnet 22, the flow of the field φ2 to and from the tip of the magnetic pole portion 131 is alleviated, and the magnetic saturation at the tip can be alleviated. When such an embedded magnet type field element is adopted, since the reluctance torque can be used together, an advantage that the torque is increased can be enjoyed.

  It is desirable that only a portion of the field element core 21 located between the field magnet 22 and the armature 1 is made of a dust core. Since the magnetic flux easily flows in the field element core 21 at this position in parallel to the rotation axis Q, the amount of magnetic flux passing through the tip of the magnetic pole portion 131 can be reduced. This is desirable from the viewpoint of reducing magnetic saturation at the tip. Of course, you may comprise all the field element cores 21 with a dust core.

  From the magnetic pole portion 131, magnetic flux flows into and out of the field element 2 through a gap between the field element 2 and the armature 1. On the other hand, a large amount of magnetic flux flows into and out of the winding part 133. Therefore, in order to avoid magnetic saturation in the winding part 133, the radial dimension of the winding part 133 is desirably thicker than the radial dimension of the magnetic pole part 131.

  By reducing the magnetic saturation at the tip of the magnetic pole part 131, the radial thickness of the magnetic pole part 131 can be made thinner on the projection 134 side than on the connecting part 132 side. This is desirable in that the magnetic flux distribution in the magnetic pole part 131 is made uniform.

  The above effect does not assume the presence of the yoke 11. However, by providing the yoke 11 and magnetically short-circuiting the winding portions 133 on the side opposite to the connecting portion 132, the magnetic flux is short-circuited between the winding portion 133 and the magnetic pole portion 131 at the position. Prevent inflow and outflow. This is desirable in that the rotating magnetic field generated by the armature easily links to the field element.

  From the same viewpoint, it is desirable that the shortest distance d1 between the yoke 11 and the magnetic pole part 131 is larger than twice the interval δ between the field element 2 and the armature 1 (gap). This is because the magnetic flux is prevented from flowing in and out between the magnetic pole portion 131 and the yoke 11 without passing through the field element 2.

  It is desirable that the dimension in the radial direction of the yoke is wider than that of the winding part 133 because the magnetic path can be shortened and the magnetic saturation can be reduced. This is because the permeance of the field magnet 22 is increased, thereby improving the magnetic flux density in the gap.

  Since the projection 134 and the hole 12 are provided, the winding 134 is wound around the winding portion 134 and then the projection 134 is fitted into the yoke 11 so that the armature 1 can be easily manufactured. Can be reliably positioned and fixed.

  The yoke 11 is preferably composed of steel plates stacked in a direction parallel to the rotation axis Q (referred to as the rotation axis direction). In addition to being easy to manufacture, since the protrusions 134 are inserted into the holes 12 in parallel with the stacking direction, there is an advantage that the bonding strength with the protrusions 134 is strong. Further, since the magnetic flux flowing in the yoke 11 between the different armature cores 13 is mostly a component perpendicular to the rotation axis Q, the magnetic resistance to the magnetic flux is small, and the iron loss is reduced.

  The armature core 13 is formed of, for example, a dust core. Since the magnetic flux flows through the armature core 13 in a three-dimensional manner, iron loss due to this occurs. However, since the dust core has high electrical resistance in any direction, the iron loss due to the magnetic flux can be reduced. Moreover, it is possible to eliminate waste from the shape by adopting a three-dimensional shape.

  10 and 11 are cross-sectional views illustrating a desirable configuration of the armature core 13. The armature core 13 is preferably configured with at least the magnetic pole portion 131 made of steel plates stacked vertically in the radial direction (FIG. 10), or made of steel plates stacked vertically in the circumferential direction (FIG. 11). . This is because the magnetic flux resistance in the extending direction of the magnetic pole portion 131 is reduced, thereby reducing magnetic flux leakage in the flow of magnetic flux between the magnetic pole portion 131 and the winding portion 134.

  The magnetic pole part 131 may be inclined in the circumferential direction. In this case, a skew is obtained without impairing the winding of the winding 14, and the cogging torque can be reduced.

  As each of the windings 14 is wound in a concentrated manner around each of the winding portions 133 as in the present embodiment, the circumference of the winding 14 is shortened and its electrical resistance (so-called winding resistance) is reduced. ) Is desirable from the viewpoint of high efficiency. Of course, distributed winding may be employed. The example which employ | adopted the distributed winding in this invention is shown by 2nd Embodiment.

  In order to reduce the winding resistance, it is also desirable to employ a rectangular wire for the winding 14. That is, since the coil has a shape in which substantially the same shape is extended in the direction of the rotation axis, the aligned winding is easy.

  FIG. 12 is a plan view showing a first modification of the first embodiment, viewed from the protrusion 134 side (opposite to the connecting portion 132). The armature 1 further includes a nonmagnetic ring portion 7 that fixes the magnetic pole portion 131 on the protrusion 134 side. By providing such a ring portion 7, the magnetic pole portion 131 is fixed, the mechanical strength is increased, and deformation can be prevented.

  FIG. 13 is a plan view seen from the connecting portion 132 side, showing a second modification of the first embodiment. The armature 1 further includes a nonmagnetic ring portion 8 that fixes the connecting portion 132. By providing the ring portion 8, the connecting portion 132 is fixed, the mechanical strength is increased, and deformation can be prevented.

  The outer rotor type is advantageous in that the field magnet 12 is wide and the field is large. In addition, it is desirable that the interval d4 (FIG. 3) between the magnetic pole portions 131 adjacent in the direction is narrower than the interval d5 (FIG. 3) between the winding portions 133 adjacent in the circumferential direction. This is because the magnetic pole portion 131 having a larger area facing the field element 2 increases the field magnetic flux linked to the armature 1.

Second embodiment.
14 and 15 show the configuration of an electric motor according to a second embodiment of the present invention, and show plan views viewed from two directions parallel to the rotation axis Q. FIG. FIG. 16 shows a structure in a cross section including a rotation axis parallel to a rotation axis (not shown) on only one side with respect to the rotation axis.

  A so-called inner rotor type motor is illustrated in which the field element 4 functioning as a rotor is opposed to the inner peripheral side of the armature 3 functioning as a stator. The inner rotor type electric motor is advantageous in that the shaft can be easily held by the field element 4.

  The armature 3 includes a plurality of armature cores 33 and windings 34a and 34b wound around them. Each of the armature cores 33 has a magnetic pole part 331 and a winding part 333 extending in parallel with the rotation axis Q, and a connecting part 332 that connects both of them. The windings 34 a and 34 b are wound around a plurality of winding portions 333. Since each of the windings 34a and 34b is wound with distributed winding over the plurality of winding portions 333, it is possible to improve interlinkage magnetic flux and reduce vibration and noise. Even in the case of adopting distributed winding, which is obtained in a so-called axial gap type electric motor, the advantage that the increase in coil end is small can be enjoyed.

  The winding part 333 faces the field element 4 in the radial direction with respect to the rotation axis Q via the magnetic pole part 331.

  The armature 3 further includes a yoke 31. The yoke 31 is on the side opposite to the connecting portion 332 and magnetically shorts the winding portions 333 to each other. The dimension of the yoke 31 in the radial direction is preferably wider than that of the winding part 333. The shortest distance d2 between the yoke 31 and the magnetic pole portion 331 is preferably larger than twice the distance δ between the field element 4 and the armature 3.

  The armature core 33 further includes a protrusion 334 connected to the winding part 333 on the side opposite to the connection part 332. On the other hand, the yoke 31 has a hole 32 into which a plurality of protrusions 334 are inserted. The hole 32 may be a recess that does not penetrate.

  The field element 4 has a so-called embedded magnet type configuration, and has a field element core 41 and a field magnet 42. The field magnet 42 is embedded in the field element core 41 and faces the magnetic pole part 331 through the field element core 41. A gap 43 is provided at both ends of the field magnet 42 to prevent the field from flowing in and out in a short-circuit between a pair of magnetic pole portions of one field magnet 42 itself.

  FIGS. 17 and 18 both show the configuration of the armature core 33, and show plan views corresponding to FIGS. 15 and 14, respectively. FIG. 19 is a plan view showing the configuration of the yoke 31. 20 and 21 are plan views showing the winding 34b and the winding 34a, respectively. The winding 34a collectively represents the three-phase windings 34aU, 34aV, 34aW, and the winding 34b represents the three-phase windings 34bU, 34bV, 34bW.

  Here, a case where two field magnets 42 are provided in the field element 4 and each form a magnetic pole is illustrated. Further, the case where 12 armature cores 33 are provided in the armature 3 is illustrated.

  The armature core 33 adopts the above-described structure, and the windings 34a and 34b are wound around the winding part 333, whereby the magnetic pole part 331 can be extended to the coil end region.

  Since the projection 334 and the hole 32 are provided, the windings 34a and 34b are wound around the winding portion 334, and then the projection 334 is fitted into the yoke 31 to facilitate the manufacture of the armature 3, and the winding portion 334 and the yoke 31 can be reliably positioned and fixed. As with the yoke 11, the yoke 31 is preferably made of steel plates stacked in the direction of the rotation axis.

  22 and 23 are views schematically showing how the field generated by the field magnet 42 reaches the magnetic pole portion 331, and corresponds to the cross-sectional view shown in FIG. However, here, the field is schematically drawn with an arrow from the field magnet 42 to the magnetic pole portion 331.

  FIG. 22 shows a conventional configuration, and a gap is formed between the magnetic pole portion 331 and the field magnet 42. Accordingly, the field φ3 also flows into and out of the tip of the magnetic pole part 131. And like the magnetic pole part 131 in 1st Embodiment, it is desirable to form the front-end | tip of the magnetic pole part 331 thinly. Therefore, the tip is likely to be magnetically saturated.

  It is desirable that the gap between the tip of the magnetic pole portion 331 and the protrusion 334 is larger than twice the gap length δ so that the magnetic flux does not flow in a short circuit here.

  FIG. 23 shows a case where the electric motor according to the present embodiment is employed. The tip of the magnetic pole part 331 cannot be thickened for the reasons described above. However, since the field element core 41 is interposed between the magnetic pole portion 331 and the field magnet 42, the inflow / outflow of the field φ4 to the tip of the magnetic pole portion 331 can be reduced, and the magnetic saturation at the tip can be reduced.

  FIG. 24 is a cross-sectional view illustrating a structure according to the first modification of the second embodiment. The outer periphery of the yoke 31 is larger in diameter by d3 than the outer periphery of the windings 34a and 34b. When the inner rotor type electric motor is attached to the device, shrinkage or press-fitting using the outer periphery of the yoke 31 can be adopted, so that the housing can be omitted.

  FIG. 25 is a cross-sectional view illustrating a structure according to the second modification of the second embodiment. The yoke 31 extends in the radial direction to a position closer to the rotation axis than the outer peripheral surface of the field element 4. The inner peripheral end forms a hole 30. In FIG. 25, a distance d5 from the outer peripheral surface of the field element 4 to the inner peripheral end is shown. This is for the purpose of shortening the magnetic path of the yoke 31 and reducing its thickness to reduce the size.

  However, in order for the rotating magnetic field generated by the windings 34a and 34b to efficiently interlink with the field element 2, the distance d4 along the rotation axis between the yoke 31 and the field element 2 or the yoke 31 and the magnetic pole part. The distance d6 along the rotation axis between the magnetic field 331 and the magnetic field 331 is preferably larger than twice the gap δ between the field element 4 and the armature 3.

  The hole 30 of the yoke 31 may be made smaller than the diameter shown in FIG. 25 (that is, the distance d5 is made larger) and employed as a bearing hole. In this case, since the shaft can be fixed without providing the housing, the positional accuracy of the shaft is improved.

  Also in this embodiment, it is desirable that the magnetic pole portion 331 extends longer than the winding portion 333. The radial dimension of the winding part 333 is desirably thicker than the radial dimension of the magnetic pole part 331. The thickness of the magnetic pole portion 331 in the radial direction is preferably thinner on the opposite side than the connecting portion 32 side. The armature core 33 is preferably formed of a steel plate in which at least the magnetic pole portion 331 is laminated in the radial direction or in the circumferential direction. Or it is desirable to form with the armature core 33 and a dust core. The magnetic pole part 331 may be inclined in the circumferential direction. The windings 34a and 34b are preferably rectangular wires. In addition, a nonmagnetic ring portion that fixes the magnetic pole portion 331 and a nonmagnetic ring portion that fixes the coupling portion 332 may be provided. The winding may be wound by concentrated winding. The advantages of these aspects have already been described in the first embodiment.

Third embodiment.
FIG. 26 is a plan view showing the structure of the armature 5 constituting the electric motor according to the third embodiment of the present invention as seen from the direction parallel to the rotation axis Q. Although the case where an outer rotor type electric motor is employed as the electric motor is illustrated in the present embodiment, an inner rotor type electric motor can also be employed.

  27 and 28 are cross-sectional views showing the structure of the electric motor in a cross section that includes a rotation shaft (not shown) and is parallel to the rotation shaft, and depict only one side in the radial direction with respect to the rotation shaft. However, FIG. 27 and FIG. 28 have different cross sections. Here, the field element 2 described in the first embodiment is adopted as an outer rotor.

  The armature 5 includes an armature core 50 and a winding 54. A plurality of armature cores 50 are arranged in the circumferential direction with respect to the rotation axis Q. Each of the armature cores 50 includes a winding portion 53 and a pair of magnetic pole portions 51 a and 51 b that extend parallel to the rotation axis Q, and a pair of connections that connect the magnetic pole portions 51 a and 51 b and the winding portion 53. Parts 52a and 52b. A winding 54 is wound around the winding portion 53. Here, the case where the winding 54 is wound by concentrated winding is illustrated, but distributed winding in which the winding 54 is wound across a plurality of winding portions 53 can also be adopted.

  In each of the armature cores 50, the connecting portions 51b and 52b are provided so as to be connected to the opposite sides with respect to the winding portion 53, respectively. The magnetic pole parts 51a and 52a are connected to the winding part 53 via the connecting parts 51b and 52b, respectively. The magnetic pole parts 51a and 52a are spaced apart from each other in the circumferential direction. Such a structure of the armature core 50 is commonly referred to as a claw pole type. The claw pole type is a desirable structure in that a copper loss can be reduced because a pair of magnetic poles can be obtained with one winding 54.

  Also in this embodiment, it is desirable that the magnetic pole portions 51 a and 51 b extend longer than the winding portion 53. The radial dimension of the winding part 53 is preferably thicker than the radial dimension of the magnetic pole parts 51a and 51b. The thicknesses of the magnetic pole portions 51a and 51b in the radial direction are preferably thinner on the opposite side than the connecting portions 52a and 52b. The armature core 50 is preferably formed of a steel plate in which at least the magnetic pole portions 51a and 51b are laminated in the radial direction or in the circumferential direction. Alternatively, the armature core 50 is preferably formed of a dust core. The magnetic pole portions 51a and 51b may be inclined in the circumferential direction. The winding 54 is preferably a rectangular wire. Further, a nonmagnetic ring part for fixing the magnetic pole parts 51a and 51b and a nonmagnetic ring part for fixing the coupling parts 52a and 52b may be provided. The advantages of these aspects have already been described in the first embodiment.

  Such a claw pole type armature 5 is also effective in the same manner as the first embodiment by configuring the electric motor in combination with the embedded magnet type field element 2. FIGS. 29 and 30 are diagrams schematically showing how the field generated by the field magnet 22 reaches the magnetic pole 51a, and corresponds to the cross-sectional view shown in FIG. Here, however, the field is schematically depicted by an arrow from the field magnet 22 to the magnetic pole 51a.

  FIG. 29 shows a conventional configuration, in which a gap is formed between the magnetic pole part 51 a and the field magnet 22. Therefore, the field φ5 also flows into and out of the tip of the magnetic pole part 51a. On the other hand, FIG. 30 shows a case where the electric motor according to the present embodiment is employed, and the field element core 21 is interposed between the magnetic pole part 51 a and the field magnet 22. Therefore, the inflow / outflow of the field φ6 to / from the tip of the magnetic pole part 51a can be reduced, and the magnetic saturation at the tip can be reduced.

  The magnetic pole portions 51a and 52a are desirably arranged apart from each other in the circumferential direction by more than twice the gap interval δ between the field element 2 and the armature 5. This is to prevent the magnetic flux from flowing in and out between the magnetic pole portions 51a and 52a without passing through the field element 2, thereby increasing the number of magnetic fluxes of the rotating magnetic field linked to the field element 2.

  Between the magnetic pole part 51a and the connection part 52b connected to the winding part 53 via the connection part 52a, or between the magnetic pole part 52a and the connection part 51b connected to the winding part 53 via the connection part 52b. It is desirable that the distance d7 be spaced apart by more than twice the gap interval δ. The magnetic flux is prevented from flowing in and out between the magnetic pole part 51a and the connecting part 52b without passing through the field element 2, and between the magnetic pole part 52a and the connecting part 51b. This is to increase the number of magnetic fluxes of the rotating magnetic field that intersects.

  The number of armature cores 50 is a multiple of 3, and the number of poles of the field element 2 is 2 more or 2 less than the total number of magnetic pole portions 51a and 51b, or 1 more or 1 even. The armature 5 and the field element 2 have the same number of poles, and the cogging torque is reduced.

  Here, the number of armature cores 50 is six, and the total number of magnetic pole portions 51a and 51b is twelve. The field element 2 has ten poles because the magnetic poles are respectively formed by the ten field magnets 22 as described above. Therefore, the equation of 12−2 = 10 is established, and the request for the number of poles is satisfied in the third embodiment.

  Alternatively, the total number of magnetic pole portions may be 9, and the number of poles may be 8. In this case, the equation 9-1 = 8 is established and the number of poles is matched. Since this combination can increase the least common multiple, the cogging torque reduction effect is also great.

  From the viewpoint of easy control, the product of the number of pole pairs of the field element 2 and the rotation speed is preferably 400 Hz or less.

  It is desirable that at least one of the connecting portions 52a and 52b and the winding portion 53 are divided in advance. First, the armature 5 can be easily manufactured by winding the winding 54 around the winding portion 53 and then connecting the connecting portions 52a and 52b and the winding portion 53 to each other.

It is sectional drawing which shows partially the structure of the electric motor concerning 1st Embodiment. It is sectional drawing which shows the structure of the field element of the electric motor concerning 1st Embodiment. It is sectional drawing which shows the structure of the armature core of the electric motor concerning 1st Embodiment. It is sectional drawing which shows the structure of the coil | winding of the electric motor concerning 1st Embodiment. It is sectional drawing which shows the structure of the yoke of the electric motor concerning 1st Embodiment. It is a top view which shows the structure of the armature of the electric motor concerning 1st Embodiment. It is a top view which shows the structure of the armature of the electric motor concerning 1st Embodiment. It is a figure which shows typically a mode that a field reaches a magnetic pole part in 1st Embodiment. It is a figure which shows typically a mode that a field reaches a magnetic pole part in 1st Embodiment. It is sectional drawing which illustrates the desirable structure of the armature core of the electric motor concerning 1st Embodiment. It is sectional drawing which illustrates the desirable structure of the armature core of the electric motor concerning 1st Embodiment. It is a top view which shows the 1st modification of 1st Embodiment. It is a top view which shows the 2nd modification of 1st Embodiment. It is a top view which shows the structure of the electric motor concerning 2nd Embodiment. It is a top view which shows the structure of the electric motor concerning 2nd Embodiment. It is sectional drawing which shows the structure of the electric motor concerning 2nd Embodiment. It is a top view which shows the structure of the armature core of the electric motor concerning 2nd Embodiment. It is a top view which shows the structure of the armature core of the electric motor concerning 2nd Embodiment. It is a top view which shows the structure of the yoke of the electric motor concerning 2nd Embodiment. It is a top view which shows the structure of the coil | winding of the electric motor concerning 2nd Embodiment. It is a top view which shows the structure of the coil | winding of the electric motor concerning 2nd Embodiment. It is a figure which shows typically a mode that a field reaches a magnetic pole part in 2nd Embodiment. It is a figure which shows typically a mode that a field reaches a magnetic pole part in 2nd Embodiment. It is sectional drawing which illustrates the structure concerning the 1st deformation | transformation of 2nd Embodiment. It is sectional drawing which illustrates the structure concerning the 2nd deformation | transformation of 2nd Embodiment. It is a top view which shows the structure of the armature which comprises the electric motor concerning 3rd Embodiment. It is sectional drawing which shows the structure of the electric motor concerning 3rd Embodiment. It is sectional drawing which shows the structure of the electric motor concerning 3rd Embodiment. It is a figure which shows typically a mode that a field reaches a magnetic pole part in 3rd Embodiment. It is a figure which shows typically a mode that a field reaches a magnetic pole part in 3rd Embodiment.

Explanation of symbols

1, 3, 5 Armature 2, 4 Field element 11, 31 Yoke 12, 32 Hole 13, 33, 50 Armature core 14, 34a, 34b, 54 Winding 21, 41 Field element core 22, 42 Field magnet Magnet 131,331,51a, 51b Magnetic pole part 132,332,52a, 52b Connecting part 133,333,53 Winding part 134,334 Protrusion

Claims (34)

An armature (1; 3; 5) and a field element (2; 4);
The armature is
A plurality of armature cores (13; 33; 50) made of a magnetic material and arranged in the circumferential direction with respect to the rotation axis;
A plurality of windings (14; 34a, 34b; 54),
Each of the armature cores is
At least one magnetic pole portion (131; 331; 51a, 51b) extending parallel to the rotation axis;
A winding part (133; 333; 53) that faces the field element in a radial direction with respect to the rotation axis through the magnetic pole part, extends in parallel with the rotation axis, and is wound with the winding. When,
Having at least one connecting part (132; 332; 52a, 52b) for connecting the magnetic pole part and the winding part;
The field element is
A field element core (21; 41);
An electric motor having a field magnet (22; 42) embedded in the field element core and opposed to the magnetic pole portion through the field element core.   The electric motor according to claim 1, wherein the magnetic pole part (131; 331; 51a, 51b) extends longer than the winding part (133; 333; 53). The armature (1; 3)
A yoke (11; 31) for magnetically short-circuiting the winding portions (133; 333) of the plurality of armature cores (13; 33) on the side opposite to the connecting portion (132; 332).
The electric motor according to claim 1, further comprising:   The electric motor according to claim 3, wherein a dimension of the yoke (11; 31) in the radial direction is wider than that of the winding part (133; 333).   The shortest distance (d1; d2) between the yoke (11; 31) and the magnetic pole part (131; 331) is between the field element (2; 4) and the armature (1; 3). The electric motor according to claim 3, wherein the electric motor is larger than twice the interval (δ). Each of the armature cores (13; 33)
Protrusions (134; 334) connected to the winding parts (133; 333) on the side opposite to the connecting parts (132; 332)
Further comprising
The yoke (11; 31)
A recess or hole (12; 32) into which a plurality of the protrusions are inserted.
The electric motor according to claim 3, comprising:   The electric motor according to claim 6, wherein the yoke (11; 31) is made of steel plates laminated in a direction parallel to the rotation axis.   The electric motor according to any one of claims 1 to 7, wherein the field element (2) is arranged outside the armature (1).   The electric motor according to claim 8, wherein an interval (d4) between the magnetic pole portions (131) adjacent in the circumferential direction is narrower than an interval (d5) between the winding portions (133) adjacent in the circumferential direction.   The electric motor according to any one of claims 1 to 7, wherein the field element (4) is disposed inside the armature (3).   The field element (4) is disposed inside the armature (3), and an outer periphery of the yoke (31) is larger in diameter (d3) than an outer periphery of the windings (34a, 34b). Item 4. The electric motor according to item 3. The yoke (31) has an inner peripheral end (30) extending in the radial direction to a position closer to the rotation axis than the outer peripheral surface of the field element (4),
The distance (d6) along the rotation axis between the yoke and the magnetic pole part (331) is greater than twice the distance (δ) between the field element and the armature (3), The electric motor according to any one of claims 10 to 11. The yoke (31) has an inner peripheral end (30) extending in the radial direction to a position closer to the rotation axis than the outer peripheral surface of the field element (4),
The distance (d4) along the rotational axis between the yoke and the field element is greater than twice the distance (δ) between the field element and the armature (3). The electric motor according to any one of claims 10 to 12.   The electric motor according to claim 3, wherein the yoke (11; 31) is provided with a bearing hole (10; 30). In each of the armature cores (50),
A pair of the connecting portions (51b, 52b) are provided on the opposite side of the winding portion (53), respectively.
The magnetic pole parts (51a, 52a) are connected to the winding part via a pair of connecting parts, and are provided as a pair,
3. The electric motor according to claim 1, wherein the pair of magnetic pole portions are spaced apart from each other in the circumferential direction.   The pair of magnetic pole portions (51a, 52a) are arranged apart from each other in the circumferential direction by more than twice the interval (δ) between the field element (2) and the armature (5). The electric motor according to claim 15. In each of the armature cores (50),
The shortest distance between the magnetic pole part (51a; 51b) connected to the winding part (53) via the one connection part (52a; 52b) and the other connection part (52b; 52a) The electric motor according to any one of claims 15 to 16, wherein (d7) is greater than twice the interval (δ) between the field element (2) and the armature (5). . The number of armature cores (50) is a multiple of three;
18. The field element according to claim 15, wherein the number of poles of the field element is an even number that is one or two more than a total number of the magnetic pole portions (51 a; 51 b), or an even number that is one or two less. Electric motor. The armature (1; 3; 5)
The non-magnetic first ring portion (7) for fixing the magnetic pole portion (131; 331; 51a, 51b) on the opposite side to the connecting portion (132; 332; 51b, 52b). The electric motor according to claim 18. The armature (1; 3; 5)
The electric motor according to any one of claims 1 to 19, further comprising a non-magnetic second ring portion (8) for fixing the connecting portion (132; 332; 51b, 52b).   The dimension in the radial direction of the winding part (133; 333; 53) is thicker than the dimension in the radial direction of the magnetic pole part (131; 313; 51a, 51b). The electric motor as described in one.   The thickness of the said magnetic pole part (131; 333; 51a, 51b) in the said radial direction is thinner on the opposite side to the said connection part than the said connection part (132; 312; 52a, 52b) side. The electric motor according to any one of claims 21 to 21.   Each of said armature core (13; 33; 50) is comprised with the steel plate by which the said magnetic pole part (131; 331; 51a, 52a) was laminated | stacked perpendicularly | vertically with the said radial direction. The electric motor according to claim 22.   Each of said armature core (13; 33; 50) is comprised with the steel plate by which the said magnetic pole part (131; 331; 51a, 52a) was laminated | stacked perpendicularly | vertically on the said circumferential direction. The electric motor according to claim 22.   23. The electric motor according to any one of claims 1 to 22, wherein each of the armature cores (13; 33; 50) is formed of a dust core.   The electric motor according to any one of claims 1 to 25, wherein the magnetic pole part (131; 331; 51a, 52a) is inclined in the circumferential direction.   27. Each of the plurality of windings (14; 54) is wound in a concentrated manner around each of the winding portions (133; 53). Electric motor.   27. The electric motor according to any one of claims 1 to 26, wherein each of the plurality of windings (34a, 34b) is wound with distributed winding over the plurality of winding portions (333). .   The electric motor according to any one of claims 1 to 28, wherein the winding (14; 34a, 34b; 54) is a rectangular wire.   The field element core (21; 41) has at least a portion located between the field magnet (22; 42) and the armature (1; 3; 5) made of a dust core. 30. The electric motor according to any one of claims 1 to 29. A method of manufacturing an electric motor according to claim 6,
(A) winding the winding (14; 34a, 34b) around the winding part (133; 333);
(B) After the step (a) is executed, the method includes: inserting the protrusions (134; 334) into the recesses or holes (12; 32). A method of manufacturing an electric motor according to any one of claims 15 to 18,
Each of the armature cores (50)
It is divided in advance between at least one of the connecting portions (52a, 52b) and the winding portion (53),
(A) winding the winding (54) around the winding section;
(B) After the said step (a) is performed, the manufacturing method of an electric motor provided with the step which couple | bonds the said connection part (52a, 52b) and the said winding part (53). A method of manufacturing an electric motor according to any one of claims 15 to 18,
Each of the armature cores (50)
It is divided in advance in the winding part (53),
(A) winding the winding (54) around a part of the winding part;
(B) After the said step (a) is performed, the manufacturing method of an electric motor provided with the step which couple | bonds the said connection part (52a, 52b) and the said winding part (53). The method for operating the electric motor according to any one of claims 15 to 18, wherein the product of the number of pole pairs of the field element and the rotation speed is 400 Hz or less.

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