JP2013132149A - Rotary electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary electric machine capable of suppressing the deterioration of reluctance torque.SOLUTION: An outer peripheral surface 14 of a field element core 10 has 4n magnetic poles (n is a natural number) formed by permanent magnets 11. An armature 3 includes 3n teeth 32. In the positional relationship in which a boundary (an interpole) between two of the magnetic poles adjacent to each other in a circumferential direction matches the center in the circumferential direction of one of the teeth 32, in the circumferential direction, and in the state where the armature 3 and a field element 1 face each other, a distance dx between a surface 333 on a side of a wiring 35 of a flange portion 332 belonging to the one of the teeth 32 and a magnet storing hole 12 takes a minimum value d0 at an edge portion 334 on the surface 333 opposite to an extension portion 321.

Description

  The present invention relates to a rotating electrical machine, and more particularly to a rotating electrical machine in which a permanent magnet is embedded in a field element core.

  Non-Patent Document 1 describes an electric motor including a field element and an armature. The field element and the armature, for example, face each other through an air gap in the radial direction about the rotation axis, and rotate relative to each other about the rotation axis. In Non-Patent Document 1, the field element has a field element core and a permanent magnet attached to the outer peripheral surface of the field element core. The armature includes an annular back yoke, a plurality of teeth, and a plurality of windings. The teeth have an extending portion that extends from the back yoke toward the field element and is wound with a winding, and a flange that extends in the circumferential direction from the extending portion on the field element side.

  Further, as an electric motor that can use not only magnet torque but also reluctance torque, as in Non-Patent Document 2, an electric motor in which a permanent magnet is embedded in a field element core has been proposed. The reluctance torque increases as the difference between the so-called d-axis inductance and q-axis inductance increases.

  In both Non-Patent Documents 1 and 2, an electric motor in which the number of armature teeth (the number of slots) is larger than the number of magnetic poles (the number of poles) of the field element is considered.

  Further, Patent Document 1 is cited as a technique related to the present invention, and even in Patent Document 1, the number of slots is larger than the number of poles.

JP 2000-166135 A

Akatsukan, Shinji Sakurai, “Simple design method of multi-pole multi-slot concentrated winding SPMSM using winding coefficient and inductance coefficient”, Electrical Engineering D, Vol. 127, No. 11, 2007 Akio Yamabata and two others, “Magnetic Characteristics of PM Motors with Air-Conditioned Magnets for Air Conditioners”, Journal of Power Electronics Research Group, Vol.23, No1, 1997

  However, in any of Patent Document 1 and Non-Patent Documents 1 and 2, no consideration is given to the magnetic flux density in the heel portion of the teeth. This is due to the following reason. That is, in Patent Document 1 and Non-Patent Documents 1 and 2, the number of slots is larger than the number of poles. In such a rotating electrical machine, the width of the magnetic pole surface of the field element in the circumferential direction is wider than the distance between the centers of the teeth in the circumferential direction. Accordingly, the q-axis magnetic flux tends to flow through the extending portion of the teeth, and no consideration is given to the magnetic flux density of the collar portion.

  On the other hand, when the ratio of the number of poles to the number of slots is 4 to 3, the width of the magnetic pole surface of the field element in the circumferential direction is narrower than the distance between the centers of the teeth in the circumferential direction. Therefore, the magnetic flux that enters the adjacent pole from one of the poles of the permanent magnet tends to flow through the teeth ridge.

  11 and 12 show hysteresis loss occurring in the armature. 11 and 12, the contour lines 100 to 105 are used to show the distribution of hysteresis loss. The higher the number of the sign, the higher the contour line shows the hysteresis loss. FIG. 11 shows an example of hysteresis loss in a 4-pole, 6-slot rotary electric machine, and FIG. 12 shows hysteresis loss in an 8-pole, 6-slot rotary electric machine. 11 and 12 also show permanent magnets so that the number of poles can be determined.

  13 and 14 are enlarged views of a part of the armature of FIGS. 11 and 12, respectively. In the illustrations of FIGS. 11 and 13, there are almost no portions where the hysteresis loss is higher than the contour line 104 in the heel portion of the teeth, but rather the contour line 105 having the highest hysteresis loss near the center in the circumferential direction of the teeth is shown. On the other hand, in the examples of FIGS. 12 and 14, it can be seen that the hysteresis loss is higher than that of the contour line 104 at the heel portion of the teeth.

  11 and 12, the same armature is employed, and conditions other than the ratio between the number of poles and the number of slots are the same. Since the same armature is employed in FIGS. 11 and 12 as described above, the difference in hysteresis loss shown in FIGS. 11 and 12 can be regarded as a difference in magnetic flux density. That is, as illustrated in FIG. 12, in a rotating electric machine having 8 poles and 6 slots, the magnetic flux density is increased at the heel portion of the teeth. In other words, it can be understood that the magnetic flux density is increased at the heel portion of the teeth, and magnetic flux saturation occurs. This is because the magnetic flux entering from one pole of the permanent magnet to the adjacent pole makes the teeth heel portion It is thought that it originates in being easy to flow.

  When magnetic flux saturation occurs in the magnetic path through which the q-axis magnetic flux including the teeth of the teeth flows in this way, the q-axis inductance is lowered, and consequently the reluctance torque is lowered.

  Then, an object of this invention is to provide the rotary electric machine which can suppress the fall of a reluctance torque.

  A first aspect of a rotating electrical machine according to the present invention includes a field element (1) fixed to a shaft that rotates about a rotation axis (P), and a side opposite to the rotation axis with respect to the field element. And an armature (3) facing the field element via an air gap, the field element includes a plurality of permanent magnets (11) arranged in a ring around the rotation axis (P), A magnet housing hole (12) in which the permanent magnet is housed, and an outer peripheral surface (14) facing the armature through the air gap in which 4n (n is a natural number) magnetic poles are formed by the permanent magnet. A field element core (30) having 3n teeth (33) arranged radially about the rotation axis, and the teeth opposite to the field element. A back yoke (31) for connecting one ends of the teeth and a winding (35) wound around the teeth. An extending part (331) extending in the radial direction from the end, and a flange part (332) provided at one end of the extending part on the field element side and extending in the circumferential direction from the extending part The armature and the field magnets have a positional relationship in which a boundary between two of the magnetic poles adjacent to each other in the circumferential direction coincides with a center in the circumferential direction of one of the teeth in the circumferential direction. In a state where the child faces each other, the distance (dx) between the winding side surface (333) of the flange portion belonging to the one of the teeth and the magnet storage hole is the surface of the surface The minimum value (d0) is taken at the end (334) on the opposite side to the extension.

  A second aspect of the rotating electrical machine according to the present invention is the rotating electrical machine according to the first aspect, wherein the field element core (10) includes the rotating shaft (P) of the permanent magnet (20). A non-magnetic body (13) extending from both sides in the circumferential direction centering on the outer peripheral surface (111), and the distance between the surface of the flange and the non-magnetic body is It is not less than the minimum value.

  A third aspect of the rotating electrical machine according to the present invention is the rotating electrical machine according to the first or second aspect, wherein the surface (333) of the flange (332) extends along the rotational axis (P). It has a straight line shape when viewed.

  A fourth aspect of the rotating electrical machine according to the present invention is the rotating electrical machine according to the second aspect, wherein the surface (333) of the flange portion (332) is a straight line when viewed along the rotational axis (P). In the state, in the state, at the intersection (335) of the surface (333) of the flange (332) and the extension (331), the surface, the magnet storage hole (12) and the The distance between the set of nonmagnetic bodies (13) takes the same value as the minimum value (d0).

  A fifth aspect of the rotating electrical machine according to the present invention is the rotating electrical machine according to the first or second aspect, wherein the surface (333) of the flange portion (332) extends along the rotational axis (P). As seen, it has a shape along a curve that swells toward the winding (35).

  A sixth aspect of the rotating electrical machine according to the present invention is the rotating electrical machine according to the second aspect, wherein the surface (333) of the flange portion (332) is viewed along the rotational axis (P), The non-magnetic body (13) has a shape along an arc that swells to the winding (35) side, and the non-magnetic body (13) is on the side of the permanent magnet (12) adjacent to the winding (35). A first surface (13a) extending toward the outer peripheral surface (14); and a second surface (13d) connected to the first surface and extending along the circumferential direction on the outer peripheral surface side. In this state, the center of the arc is located at the intersection (13f) between the first surface and the second surface.

  A seventh aspect of the rotating electrical machine according to the present invention is the rotating electrical machine according to any one of the first to sixth aspects, and is provided between the winding (35) and the teeth (33) and the winding. From the interposition part (361) interposed between the wire (35) and the back yoke (31), and from the interposition part between the flange part (332) and the winding, the extension part (331) And an insulator (36) having a nonmagnetic support portion (361) that extends to the opposite side of the coil and supports the winding.

  According to the first aspect of the rotating electrical machine of the present invention, in the rotating electrical machine, the number of poles is 4n and the number of slots (= the number of teeth) is 3n. In such a rotating electrical machine, the magnetic flux density tends to increase at the heel. Because the number of poles is larger than the number of slots, the end of the permanent magnet is likely to face the hook of the teeth, and as a result, the magnetic flux that enters the adjacent pole from one of the poles of the permanent magnet easily flows through the teeth hook. It is.

  On the other hand, according to this rotating electrical machine, the distance between the surface of the flange on the winding side and the magnet storage hole takes the minimum value at the end of the surface opposite to the extending portion. The magnetic path defined by the surface and the magnet housing hole is a magnetic path through which the q-axis magnetic flux flows, and the distance takes the minimum value at the end, thereby contributing to securing the width of the magnetic path. be able to. As a result, the magnetic flux saturation in the heel part of the teeth can be suppressed. When magnetic flux saturation occurs, the q-axis inductance decreases, and the reluctance torque decreases. According to this rotating electrical machine, such a decrease in reluctance torque can be suppressed.

  According to the 2nd aspect of the rotary electric machine concerning this invention, even if there exists a nonmagnetic material, it can contribute to ensuring of the width | variety of a q-axis magnetic path.

  According to the 3rd aspect of the rotary electric machine concerning this invention, manufacture is easy, and since it does not protrude to the coil | winding side, reduction of the area (slot area) around which a coil | winding is wound can be suppressed.

  According to the 4th aspect of the rotary electric machine concerning this invention, a slot area can be enlarged, ensuring a q-axis magnetic path.

  According to the 5th aspect of the rotary electric machine concerning this invention, it contributes to realization of the rotary electric machine concerning a 1st aspect.

  The sixth aspect of the rotating electrical machine according to the present invention contributes to the realization of the rotating electrical machine according to the fifth aspect.

  According to the seventh aspect of the rotating electrical machine of the present invention, the area in which the winding can be wound can be increased as viewed along the rotation axis.

It is a figure which shows an example of a notional structure of a rotary electric machine. It is a figure which shows an example of some conceptual structures of a field element. It is a figure which shows an example of some conceptual structures of a field element. It is a figure which shows an example of some conceptual structures of a field element. It is a figure which shows an example of some conceptual structures of a rotary electric machine. It is a figure which shows an example of some conceptual structures of a rotary electric machine. It is a figure which shows an example of some conceptual structures of a rotary electric machine. It is a figure which shows an example of some conceptual structures of a rotary electric machine. It is a figure which shows an example of some conceptual structures of a rotary electric machine. It is a figure which shows an example of some conceptual structures of a rotary electric machine. It is a figure which shows an example of distribution of hysteresis loss. It is a figure which shows an example of distribution of hysteresis loss. It is the figure which expanded a part of armature of FIG. It is the figure which expanded a part of armature of FIG.

  As illustrated in FIG. 1, the rotating electrical machine includes a field element 1 and an armature 3. FIG. 1 shows an example of a conceptual configuration of the rotating electrical machine in a predetermined cross section perpendicular to the rotation axis P. Other drawings referred to below also show the configuration in the cross section. In the following, the radial direction around the rotation axis P is simply called the radial direction, the circumferential direction around the rotation axis P is simply called the circumferential direction, and the direction along the rotation axis P is called the axial direction.

  The field element 1 is fixed to a shaft (not shown) that rotates about the rotation axis P. The armature 3 faces the field element 1 through an air gap on the side opposite to the rotation axis P with respect to the field element 1.

  The field element 1 includes a field element core 10 and a permanent magnet 11. The field element core 10 is formed of a soft magnetic material (for example, iron). The core 10 for field elements has the outer peripheral surface 14, and the outer peripheral surface 14 opposes the armature 3 through an air gap in radial direction. The field element core 10 has, for example, a substantially cylindrical shape with the rotation axis P as the center. Therefore, in the illustration of FIG. 1, the outer peripheral surface 14 has a substantially circular shape.

  A plurality of magnet storage holes 12 are formed in the field element core 10. Each magnet storage hole 12 stores a permanent magnet 11. The plurality of permanent magnets 11 are, for example, rare earth magnets (for example, rare earth magnets mainly composed of neodymium, iron, and boron), and are arranged annularly around the rotation axis P. Moreover, in the illustration of FIG. 1, each permanent magnet 11 has a rectangular parallelepiped plate shape. Each permanent magnet 11 is arranged in a posture in which its thickness direction is along the radial direction at its center in the circumferential direction. Each permanent magnet 11 is not necessarily required to adopt the shape shown in FIG. Each permanent magnet 11 has a V-shape that opens to the opposite side (hereinafter also referred to as the outer peripheral side) or the rotational axis P side (hereinafter also referred to as the inner peripheral side), for example, when viewed in the axial direction. Or you may have the circular-arc-shaped shape opened to an outer peripheral side or an inner peripheral side.

  The plurality of permanent magnets 11 forms 4n (n is a natural number) magnetic pole surfaces on the outer peripheral surface 14. The polarities of the 4n magnetic pole surfaces are alternately different in the circumferential direction. In the illustration of FIG. 1, eight permanent magnets 11 are provided, and these eight permanent magnets 11 form eight magnetic pole surfaces on the outer peripheral surface 14. This is realized by arranging the permanent magnet 11 so that the polarities of the surface (magnetic pole surface) on the outer peripheral surface 14 side of the permanent magnet 11 are alternately different in the circumferential direction.

  In the illustration of FIG. 1, each of the eight permanent magnets 11 forms one magnetic pole surface on the outer peripheral surface 14, but one magnetic pole surface may be formed by a plurality of permanent magnets 11, for example. In other words, each of the permanent magnets 11 in FIG. 1 may be divided into a plurality of permanent magnets.

  In the illustration of FIG. 1, the field element core 10 has nonmagnetic bodies 13 on both sides in the circumferential direction of the permanent magnet 11 that forms each of the magnetic pole faces. The nonmagnetic material 13 extends from both sides of the permanent magnet 11 toward the outer peripheral surface 14. The nonmagnetic material 13 suppresses a short circuit of the magnetic flux between the outer peripheral surface and the inner peripheral surface of the permanent magnet 11. The nonmagnetic material 13 is formed by, for example, a gap. If the nonmagnetic material 13 is formed with a gap, the manufacturing cost can be reduced compared to the case where a predetermined nonmagnetic material is employed as the nonmagnetic material 13.

  2 to 4 show conceptual examples of the non-magnetic material 13, respectively. In the illustrations of FIGS. 2 to 4, only a portion corresponding to one magnetic pole of the field element 1 is shown. In the illustration of FIG. 2, the nonmagnetic material 13 has surfaces 13a to 13d. The surface 13b is continuous with the inner peripheral surface 12b of the magnet storage hole 12 and extends substantially parallel to the surface 12b. A step may be formed between the surfaces 13b and 12b so that the surface 13b is positioned on the outer peripheral side of the surface 12b. Accordingly, the step can function as a stopper in the circumferential direction of the permanent magnet 11. The surface 13c extends substantially in the radial direction from the end of the surface 13b on the side opposite to the surface 12b. The surface 13d extends in a substantially circumferential direction from an outer peripheral end of the surface 13c. The surface 13a extends from the end of the surface 13d on the center (magnetic pole center) side in the circumferential direction of the permanent magnet 11 to the surface 12a on the outer peripheral side of the magnet storage hole 12, and reaches the surface 12a. It can be understood that the surface 13a extends toward the outer peripheral surface 14 on the side of the permanent magnet 11 adjacent to the nonmagnetic body 13, and the surface 13d is connected to the surface 13a and extends in the circumferential direction on the outer peripheral surface 14 side. It can be understood that it extends. In the illustration of FIG. 2, the surfaces 13 a to 13 d are straight lines when viewed along the axial direction.

  In the illustrations of FIGS. 1 and 2, a part of the field element core 10 is interposed between adjacent nonmagnetic bodies 13 (between the surfaces 13 c) on the boundary (between poles) side of the magnetic pole surface. Yes. Since a part of the so-called q-axis magnetic flux passes through the core portion, the q-axis inductance can be improved. As a result, reluctance torque can be improved.

  In the illustrations of FIGS. 1 and 2, the core portion on the outer peripheral side of the field element core 10 with respect to the permanent magnet 11 and the core portion between the nonmagnetic bodies 13 are connected to each other on the outer peripheral side. Thereby, even if the nonmagnetic material 13 is formed with a gap, the strength of the field element core 10 can be improved. In addition, it is desirable that the width in the radial direction of the core portion between the non-magnetic body 13 and the outer peripheral surface 14 is narrow to such an extent that the core portion is easily saturated with magnetic flux. This is because it is possible to prevent the magnetic flux from being short-circuited between the outer peripheral surface and the inner peripheral surface of the permanent magnet 11 via the core portion.

  In the illustration of FIG. 3, the nonmagnetic material 13 is separated from the magnet storage hole 12 in the circumferential direction as compared with the field element 1 of FIG. 2. In other words, a part of the field element core 10 is interposed between the nonmagnetic material 13 and the magnet housing hole 12. Thereby, even if the nonmagnetic material 13 is formed with a gap, the strength of the field element core 10 can be improved.

  In the illustration of FIG. 4, compared with the field element 1 of FIG. 2, the nonmagnetic material 13 further includes a surface 13e. The surface 13e is a surface that connects the surface 12a and the surface 13a. The surface 13a is more along the outer peripheral surface 14 than the surface 13a of FIG. In other words, the smaller angle among the angles formed by the straight line along the surface 13a and the outer peripheral surface 14 is smaller in the example of FIG. The surface 13e extends from the end of the surface 13a on the magnetic pole center side to the surface 12a and reaches the surface 12a. Of the angles formed by the straight line along the surface 13e and the outer peripheral surface 14, the smaller angle is larger than that of the surface 13a.

  Of course, the shape of the non-magnetic material 13 is not limited to the above-described example, and it is possible to suppress a short circuit of the magnetic flux between the magnetic pole surface on the outer peripheral side and the magnetic pole surface on the inner peripheral side of the permanent magnet 11. What is necessary is just to have arbitrary shapes.

  Referring again to FIG. 1, the armature 3 includes a back yoke 31, 3n teeth 33, and an armature winding 35. The back yoke 31 is formed of a soft magnetic material (for example, iron) and has an annular shape with the rotation axis P as the center, for example. The 3n teeth 33 are formed of a soft magnetic material (for example, iron) and are arranged radially about the rotation axis P. The back yoke 31 magnetically connects one ends of the 3n teeth 33 on the side opposite to the field element 1.

  The armature winding 35 is wound around the teeth 33 by, for example, concentrated winding with the radial direction as an axis. In the present application, unless otherwise specified, the armature winding does not indicate each of the conductive wires constituting the armature winding, but indicates an aspect in which the conductive wires are wound together. The same applies to the drawings. In addition, the drawing lines at the start and end of winding and their connection are also omitted in the drawings.

  In such a rotating electric machine, the armature 3 can apply a rotating magnetic field to the field element 1 by appropriately supplying a current to the armature winding 35. Thereby, for example, the field element 1 rotates according to the rotating magnetic field. In other words, the field element 1 functions as a rotor, and the armature 3 functions as a stator.

  Next, the shape of the teeth 33 will be described in more detail with reference to FIG. FIG. 5 schematically shows one tooth 33 and a part of the field element 1 facing it.

  The teeth 33 have an extending part 331 and a flange part 332. The extending portion 331 extends from the back yoke 31 to the rotation axis P along the radial direction toward the field element 1, and the armature winding 35 is wound around the extending portion 331. The flange portion 332 is continuous with the extending portion 331 on the side opposite to the back yoke 31. The flange portions 332 extend from the extending portion 331 to opposite sides in the circumferential direction. For example, collapse of the armature winding 35 can be suppressed by the flange portion 332.

  The surface of the teeth 33 facing the field element 1 is formed by the surface of the extending portion 331 on the field element 1 side and the surface of the flange portion 332 on the field element 1 side. It has a shape along a circular arc as a center.

  Now, in order to specify the shape of the teeth 33, more specifically, the shape of the surface 333 of the flange portion 332 on the armature winding 35 side, the state in which the field element 1 and the armature 3 face each other in the following positional relationship. Consider. That is, as illustrated in FIG. 5, the center in the circumferential direction of the teeth 33 (hereinafter referred to as the center of the teeth) and the boundary of the magnetic pole surface in the circumferential direction (hereinafter referred to as the distance between the poles) Consider the matching state at. In this state, the distance dx between the surface 333 of the flange 332 on the armature winding 35 side and the magnet housing hole 12 is the minimum value d0 at the end 334 of the surface 333 opposite to the extending portion 331. Take.

  Thereby, the distance between the surface 333 and the magnet storage hole 12 can be ensured to be equal to or greater than the minimum value d0. A portion between the surface 333 and the magnet storage hole 12 functions as a magnetic path through which a part of the q-axis magnetic flux flows. In the illustration of FIG. 2, an example of a part of the q-axis magnetic flux is indicated by a thick arrow. Since the width of the magnetic path between the surface 333 and the magnet storage hole 12 can be ensured to be equal to or greater than the minimum value d0, the magnetic flux saturation in the flange portion 332 of the tooth 33 can be suppressed. Consequently, it is possible to suppress a decrease in reluctance torque by suppressing a decrease in q-axis inductance.

  When the nonmagnetic material 13 is provided as illustrated in FIG. 5, the distance dx between the surface 333 of the flange 332 and the pair of the nonmagnetic material 13 and the magnet storage hole 12 is the end portion 334 side. It is desirable to take the minimum value at. In other words, it is desirable that the distance between the surface 333 and the nonmagnetic material 13 is also not less than the minimum value d0. This is because the portion between the non-magnetic body 13 and the surface 333 also functions as a magnetic path through which the q-axis magnetic flux flows, and also in this portion, the width of the magnetic path through which the q-axis magnetic flux flows can be secured.

  As described above, in a rotating electrical machine having the number of slots equal to or greater than the number of poles, there is very little need to suppress magnetic flux saturation in the heel portion of the teeth. Therefore, there has been no conventional direction to suppress the magnetic flux density at the heel portion of the teeth. On the other hand, in this rotating electrical machine in which the ratio of the number of poles to the number of slots is 4 to 3 as in the present embodiment, by using the teeth that satisfy the above-described relationship, the hips of the teeth that have not been focused on conventionally The magnetic flux density of the teeth can be reduced, and magnetic flux saturation at the heel portion of the teeth, which is a problem in this rotating electrical machine, can be suppressed.

  In the illustration of FIG. 5, the surface 333 of the flange 332 has a linear shape when viewed along the axial direction. Therefore, it is easy to manufacture and does not protrude toward the armature winding 35, so that it is difficult to reduce the area around which the armature winding 35 is wound (hereinafter referred to as the slot area) when viewed in the axial direction. Therefore, for example, when a winding is wound with the same number of turns, a thicker conductor can be adopted as the winding. Therefore, the occurrence of copper loss can be suppressed.

  Also at the intersection 335 between the surface 333 and the extending portion 331, it is desirable that the distance dx between the surface 333 and the pair of the magnet storage hole 12 and the nonmagnetic material 13 takes the minimum value d0. This is due to the following reason. That is, for example, if the intersection point 335 is further on the back yoke 31 side, the flange portion 332 is spatially spread on the armature winding 35 side, and the slot area is reduced. Therefore, the distance dx also takes the minimum value d0 at the intersection 335, which contributes to securing the width of the d-axis magnetic path and also securing the slot area. Therefore, copper loss can be suppressed.

  In the illustration of FIG. 6, the width W1 in the circumferential direction of the extending part 331 of the teeth 33 is smaller than the distance D1. The distance D1 is the distance between the ends of the surfaces 12a in the circumferential direction of the surface 12a belonging to the magnet storage holes 12 adjacent to each other in the circumferential direction. In this case, in order to make the distance between the surface 333 and the nonmagnetic material 13 equal to or greater than the minimum value d0, it is necessary to determine the inclination of the surface 333 so that the intersection 335 is located closer to the back yoke 31 side. This is because the distance between the nonmagnetic material 13 and the outer peripheral surface 14 becomes smaller toward the interpolar side. In the illustration of FIG. 6, the surface 333 and the surface 13 a of the nonmagnetic material 13 are parallel to each other. Thereby, the surface 333 can be easily determined in designing.

  In the illustration of FIG. 7, the width W1 is larger than the distance D1. In this case, even if the intersection point 335 is away from the back yoke 31, the surface 333 in which the distance dx takes the minimum value at the end portion 334 can be employed. Compared with FIG. 6, the intersection point 335 is separated from the nonmagnetic body 13 in the circumferential direction. Therefore, even if the intersection point 335 is closer to the field element 1, the intersection point 335 and the nonmagnetic body 13 are separated. This is because the distance can be secured to the minimum value d0 or more.

  In the illustration of FIG. 7, the surface 333 is parallel to the surface 12 a of the magnet storage hole 12. However, also in the illustration of FIG. 7, the distance between the intersection 335 and the nonmagnetic material 13 is not less than the minimum value d0. Therefore, the width of the q-axis magnetic path can be secured. Moreover, it is preferable that the surface 333 and the surface 12a are parallel because the slot area is relatively wide.

  The rotating electrical machine according to the example of FIG. 8 is the same as the rotating electrical machine of FIG. 7 except that the surface 333 is inclined. In the illustration of FIG. 8, the surface 333 is parallel to the surface 13a. Also by this, since the distance between the surface 333 and the nonmagnetic material 13 and the distance between the surface 333 and the magnet storage hole 12 are not less than the minimum value d0, a q-axis magnetic path can be secured.

  In addition, the inclination of the surface 333 which fixed the position of the edge part 334 may be set between the surface 333 of FIG. 7 and the surface 333 of FIG. As a result, it is possible to avoid that the slot area is smaller than the slot area of FIG.

  In the illustration of FIG. 9, the surface 333 has a shape along a curve that swells toward the armature winding 35 when viewed along the axial direction. Also by this, the width d of the magnetic path through which the q-axis magnetic flux flows can be ensured because the distance dx takes the minimum value d0 at the end 334 of the surface 333. In addition, the width of the magnetic path can be secured wider than when the surface 333 has a linear shape.

  In the illustration of FIG. 9, the surface 333 has a shape along an arc when viewed in the axial direction, and the center of the arc is located at the intersection 13f of the surface 13a and the surface 13d. According to this, it is easy to determine an arc at the time of design.

  As illustrated in FIG. 10, the armature 3 may further include an insulator 36. The insulator 36 has an insulating property and includes an interposition part 361 and a support part 362. The interposition part 361 is interposed between the armature winding 35 and the tooth 33 and between the armature winding 35 and the back yoke 31 as viewed from the axial direction. Thereby, it can suppress that an electric current leaks from the armature winding 35 to the teeth 33 or the back yoke 31. FIG. The support portion 362 extends from the portion of the interposition portion 361 between the armature winding 35 and the flange portion 332 to the opposite side of the extension portion 331. Thereby, even if the armature winding 35 is wound to the outer side in the circumferential direction from the end portion 334 of the flange portion 332, the support portion 362 can support the armature winding 35 in the radial direction. Therefore, it is possible to increase the area occupied by the armature winding 35 when viewed along the axial direction, and to reduce the copper loss.

  The support portion 362 is non-magnetic and is distinguished from a tooth that is a soft magnetic material. Therefore, for example, the distance between the support portion 362 and the magnet storage hole 12 may be smaller than the minimum value d0.

  Further, the insulator 36 is not limited to the armature 3 in FIG. 10 but may be included in the armature 3 in FIG. 2. However, as illustrated in FIG. 10, if the surface 333 has an arc shape centered on the intersection of the surfaces 13a and 13d, the slot area is relatively small. Therefore, the amount of expansion of the slot area by providing the insulator 36 is large.

DESCRIPTION OF SYMBOLS 1 Field element 3 Armature 10 Core for field element 11 Permanent magnet 12 Magnet storage hole 13 Nonmagnetic material 13a, 333 Surface 31 Back yoke 33 Teeth 35 Armature winding 331 Extension part 332 Gutter part 36 Insulator 361 Interposition part 362 support part

Claims (7)

A field element (1) fixed to a shaft that rotates about a rotation axis (P);
An armature (3) facing the field element via an air gap on the side opposite to the rotation axis with respect to the field element,
The field element is
A plurality of permanent magnets (11) arranged in a ring around the rotation axis (P);
A magnet housing hole (12) in which the permanent magnet is housed, and an outer peripheral surface (14) facing the armature through the air gap in which 4n (n is a natural number) magnetic poles are formed by the permanent magnet. A field element core (30) having
The armature is
3n teeth (33) arranged radially about the rotation axis;
A back yoke (31) for connecting one end of the teeth opposite to the field element;
A winding (35) wound around the teeth,
Each of the teeth is
An extending portion (331) extending in the radial direction from the one end;
Provided at one end of the extending portion on the field element side, and having a flange portion (332) extending in the circumferential direction from the extending portion,
The armature and the field element face each other in a positional relationship in which the boundary between the two magnetic poles adjacent in the circumferential direction coincides with the circumferential center of one of the teeth in the circumferential direction. In the state, the distance (dx) between the winding side surface (333) of the flange portion belonging to the one of the teeth and the magnet storage hole is the extension portion of the surface. A rotating electrical machine having a minimum value (d0) at the end (334) on the opposite side. The field element core (10) is a non-magnetic material that extends from both sides of the permanent magnet (20) in the circumferential direction around the rotation axis (P) toward the outer peripheral surface (111). (13)
The rotating electrical machine according to claim 1, wherein a distance between the surface of the flange and the nonmagnetic material is equal to or greater than the minimum value.   The rotating electrical machine according to claim 1 or 2, wherein the surface (333) of the flange portion (332) has a linear shape when viewed along the rotation axis (P). The surface (333) of the flange (332) has a linear shape as viewed along the rotation axis (P),
In the state, at the intersection (335) of the surface (333) of the flange portion (332) and the extending portion (331), the surface, the magnet storage hole (12), and the non-magnetic body (13) The distance between the pair of the rotating electrical machine according to claim 2 takes the same value as the minimum value (d0).   The said surface (333) of the said collar part (332) has a shape which follows the curve which swells to the said coil | winding (35) side seeing along the said rotating shaft (P), The Claim 1 or 2 Rotating electric machine. The surface (333) of the flange (332) has a shape along an arc that swells toward the winding (35) when viewed along the rotation axis (P),
As viewed along the rotational axis (P), the non-magnetic body (13) is a first surface (13a) extending toward the outer peripheral surface (14) on the side of the permanent magnet (12) adjacent to the non-magnetic body (13). And a second surface (13d) connected to the first surface and extending along the circumferential direction on the outer peripheral surface side,
3. The rotating electrical machine according to claim 2, wherein in the state, the center of the circular arc is located at an intersection (13 f) between the first surface and the second surface. An interposition part (361) interposed between the winding (35) and the teeth (33) and between the winding (35) and the back yoke (31);
A nonmagnetic support portion (361) extending from the interposition portion between the flange portion (332) and the winding to the opposite side of the extension portion (331) and supporting the winding; The rotating electrical machine according to any one of claims 1 to 6, further comprising an insulator (36) having:

Images