JP2008259399A - Stator for rotary electric machine equipped with toroidal winding structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To properly retain magnetic characteristics of a stator by suppressing the effect of non-uniform magnetic flux generated at a locking part of a divided core in the stator for a rotary electric machine equipped with a toroidal winding structure constituted by annularly connecting a plurality of split cores. <P>SOLUTION: In the stator 1 composed by the plurality of divided cores 2 split in a circumferential direction in units of winding parts around which a stator winding 4 is wound, each split core 2 has the locking part composed of a recessed part 14 and a protruding part 15 which are fitted to each other in order to regulate the relative movement between adjacent split cores, and in the winding part when an electric current is made to flow into the stator winding 4, the locking part is provided at a site where the magnetic flux density becomes minimum in the radial direction. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a stator for a rotating electrical machine having a toroidal winding structure.

  2. Description of the Related Art Conventionally, there is a rotating electrical machine such as a motor that employs a toroidal winding structure for the purpose of downsizing. In a stator used in this type of rotating electrical machine, a toroidal winding is provided on a yoke (junction portion) for each slot (groove portion) provided between teeth (tooth portions) of a plurality of divided cores formed in a divided manner. After applying the above, a technique is known in which the divided cores are assembled into an annular shape to form a stator.

  As such a technique, for example, a plurality of split cores stacked in slot units have recesses and protrusions on one side and the other side, respectively, and the recesses and protrusions between adjacent split cores are fitted respectively. A toroidal winding motor in which a single-circular stator is assembled by combining them is known (see Patent Document 1).

JP 2006-296035 A (FIG. 2)

  By the way, regarding the stator as described above, when the present inventors conducted an earnest investigation on the magnetic flux density distribution in the winding mounting portion forming the magnetic flux path, in the locking portion constituted by the concave portion and the convex portion, It has been found that stress concentration and deformation can cause magnetic flux unevenness that cannot be ignored in properly maintaining the magnetic characteristics of the stator. In addition, there is a bias in the magnetic flux density distribution in the radial direction of the winding mounting part (for example, when the rotor is arranged only on the inner peripheral side of the stator, the magnetic flux distribution in the radial direction of the winding mounting part is In particular, when the locking portion is provided in a portion where the magnetic flux density is relatively high in the radial direction, the magnetic characteristics of the stator are deteriorated. It turned out to be remarkable.

  However, in the conventional technology as described in Patent Document 1, the concave portion and the convex portion are provided near the center of the winding mounting portion that forms the magnetic flux path (that is, the portion where the magnetic flux density is relatively high), There has been a problem that unevenness occurs in the magnetic flux in the locking portion and the magnetic characteristics deteriorate.

  The present invention has been devised in view of such problems of the prior art, and suppresses the influence of magnetic flux unevenness generated at the engaging portions of a plurality of split cores constituting the stator, thereby reducing the magnetic characteristics of the stator. The main object of the present invention is to provide a stator for a rotating electrical machine having a toroidal winding structure that makes it possible to properly hold the coil.

  A first invention made to solve the above problems is a stator (1) for a rotating electrical machine having a toroidal winding structure, in which a stator winding (4) is wound. Consists of a plurality of divided cores (2) divided in the circumferential direction as a unit, and each of the divided cores is fitted to each other so as to restrict relative movement with adjacent divided cores. The locking portion is configured to be provided at a portion where the magnetic flux density is minimized in the radial direction in the winding portion when a current is passed through the stator winding.

  In a second invention made to solve the above problem, when the rotor is arranged only on the inner peripheral side of the stator, the locking portion is provided on the outer peripheral side end of the winding portion. Can be configured.

  In a third aspect of the invention made to solve the above problem, when the rotor is disposed only on the outer peripheral side of the stator, the locking portion is provided on the inner peripheral end of the winding portion. Can be configured.

  According to a fourth aspect of the present invention made to solve the above problems, when the rotor is arranged on the inner peripheral side and the outer peripheral side of the stator, the locking portion is a central portion in the radial direction of the winding portion. It can be set as the structure provided in.

  In a fifth aspect of the invention made to solve the above-described problem, when the rotor is arranged only on one side in the axial direction of the stator, the locking portion is arranged on the rotor arrangement side in the winding portion. Can be configured to be provided at the opposite end.

  According to a sixth aspect of the present invention made to solve the above problems, when the rotor is disposed on both sides in the axial direction of the stator, the locking portion is provided in a central portion in the axial direction of the winding portion. It can be set as the structure comprised.

  The seventh invention made to solve the above-mentioned problems is that the split core includes a radially extending portion (3) and a radially intermediate portion of the radially extending portion as a winding portion of the stator winding. And a circumferential portion (5) extending in the circumferential direction from the portion (12), and when the rotor (26) is disposed on the inner peripheral side or the outer peripheral side of the stator, the radial extension direction The part may have a structure in which a gap (20) is provided at a position located on the inner peripheral side (11) or the outer peripheral side (13) of the intermediate part opposite to the rotor arrangement side.

  An eighth invention made to solve the above-described problem is that the split core includes an axially extending portion (3) and an axially intermediate portion of the axially extending portion as a winding portion of the stator winding. When the rotor (26) is disposed on one side in the axial direction of the stator, the axially extending direction portion is In addition, a space may be provided in a portion (13) located on the opposite side to the rotor arrangement side across the intermediate portion.

  A ninth invention made to solve the above problems is a stator for a rotating electrical machine having a toroidal winding structure, and includes a predetermined number of winding portions around which the stator winding is wound. A plurality of split cores divided in the circumferential direction, each of the split cores has a locking portion consisting of a concave portion and a convex portion that fit together to restrict relative movement with the adjacent split core, The locking portion is configured to be provided at a portion where the magnetic flux density is minimized in the radial direction in the winding portion when a current is passed through the stator winding.

  According to the first and ninth aspects of the invention, the locking portion is the portion where the magnetic flux density is minimized in the radial direction of the winding portion of the winding of the split core (that is, the magnetic flux path formed in the circumferential direction). By providing in the structure, it is possible to suppress the influence of magnetic flux unevenness generated in the locking portion and to obtain an excellent effect that the magnetic characteristics of the stator can be appropriately maintained. Further, according to the second to sixth inventions, with a simple configuration, it is possible to suppress the influence of magnetic flux unevenness generated in the locking portion and appropriately maintain the magnetic characteristics of the stator. According to the sixth and seventh aspects of the present invention, loss can be reduced by increasing the magnetic resistance of the portion where leakage magnetic flux can occur.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a front view of a stator for a rotating electrical machine having a toroidal winding structure according to the first embodiment of the present invention, and FIG. 2 is a perspective view showing a split core that constitutes the stator. .

  The stator 1 is composed of a plurality of split cores 2 and is arranged between a plurality of teeth 3 which are arranged at equal intervals in the circumferential direction and extend in the radial direction as magnetic poles. As a winding part around which 4 is wound, a yoke part 5 extending in the circumferential direction is provided.

  The split core 2 is formed so as to divide the stator 1 in the circumferential direction with the winding part around which the stator winding 4 is wound as a unit, and the yoke part from near the radial center of the teeth part 3 5 has the structure extended to the side (circumferential direction). The teeth portion 3 has substantially the same width and extends inward in the radial direction, and has an inner portion 11 provided with a wide portion on the distal end side thereof, and a central portion 12 located on the outer side and integrally formed with the yoke portion 5. And an outer portion 13 located on the outer peripheral side. A concave portion 14 is provided on the outer peripheral side of the central portion 12, and the concave portion 14 is adjacent to each other together with a convex portion 15 provided so as to protrude laterally at an outer peripheral side end portion of the yoke portion 5. It functions as a locking portion that restricts relative movement (movement in the radial direction) with the split core. The shape and arrangement (radial position) of these concave portions 14 and convex portions 15 are determined so that they can be fitted to the corresponding convex portions and concave portions of the adjacent divided cores.

  Here, the latching portion including the concave portion 14 and the convex portion 15 is provided at the position of the outer peripheral side end portion of the yoke portion 5. The arrangement of such a latching portion is a stator as will be described later. When a current is passed through the winding 4 (that is, when the rotating electrical machine is in operation), the yoke portion 5 is determined based on a portion where the magnetic flux density is minimized in the radial direction. As a result, the locking portion is provided at or near the portion where the magnetic flux density is minimum in the radial direction of the winding portion of the stator winding 4 (that is, the magnetic flux path formed in the circumferential direction). It is possible to appropriately maintain the magnetic characteristics of the stator 1 by suppressing the influence of magnetic flux unevenness generated at the fitting position of the convex portion 15.

  For example, as shown in FIG. 3, the outer portion 13 of the teeth portion 3 that is located on the opposite side of the rotor 26 from the arrangement side (here, the inner peripheral side) and does not substantially form a magnetic flux path is divided. The opening 20 can be provided so as to penetrate the core 2 in the substantially axial direction. By appropriately determining the shape of the opening 20, it is possible to avoid an increase in the magnetic resistance of the portion where the main magnetic path is formed (that is, the inner portion 11 and the central portion 12 of the teeth portion 3 and the yoke portion 5). The stress from the outer peripheral side can be relaxed. In addition, the outer portion 13 enables the split core 2 to be fixed from the circumferential direction using the ring member 25.

  Furthermore, by changing the configuration (shape, quantity, arrangement, etc.) of the opening 20 provided in the outer portion 13 of the tooth portion 3, the magnetic resistance in the outer portion 13 is increased and the outer portion 13 is easily magnetically saturated. Thus, it is possible to reduce loss due to generation of leakage magnetic flux.

  For example, as the openings 20, a configuration in which square through holes 20a are arranged in a row in a circumferential direction (see FIG. 4A), or square through holes 20a are arranged in a row in a circumferential direction. A configuration (see FIG. 4B) or a configuration in which square through holes 20a are arranged in a zigzag manner in the circumferential direction (see FIG. 4C) is possible. Alternatively, as the opening 20, a configuration in which circular through holes 20a are arranged in a row in the circumferential direction (see FIG. 5A), or circular through holes 20a are arranged in two rows in the circumferential direction. A configuration (see FIG. 5B) or a configuration in which circular through holes 20a are arranged in a zigzag manner in the circumferential direction (see FIG. 5C) are also possible. In this way, by appropriately providing a gap in the outer portion 13, the formation of the leakage magnetic path P as shown by an imaginary line in FIG. 1 is inhibited. In addition, you may make it provide a groove | channel in the periphery of the outer side part 13 as an alternative of the said through-hole (at least one part). Moreover, in the structure which has arrange | positioned the rotor 26 on the outer peripheral side, the same opening part can be provided in the inner part 11 of the teeth part 3 so that the division | segmentation core 2 may be penetrated in a substantially axial direction.

  Further, the split core can be formed so as to divide the stator 1 in the circumferential direction in units of a plurality of winding portions. For example, in the case of a stator for a three-phase rotating electric machine, as shown in FIG. 6, a split core 102 that is divided in the circumferential direction in a unit including a predetermined number (three in this case) of winding parts is used. You can also. This split core 102 has a structure in which a plurality of split cores 2 shown in FIG. 2 are connected and formed as one piece, and has three tooth portions 103a to 103c and a yoke disposed between the tooth portions 103a and 103b. Part 105a, yoke part 105b disposed between teeth parts 103b and 103c, and yoke part 105c extending laterally from the radial center of tooth part 103c. In this case, the stator as shown in FIG. 1 can be formed using the six divided cores 102.

  Such a split core 2 can be formed by, for example, compression molding, resin bonding, or sintering of magnetic material powder. Alternatively, one split core may be configured by laminating a plurality of silicon steel plates.

  The stator winding 4 is a three-phase winding disposed in the slots 21 and 22 defined by the tooth portion 3 and the yoke portion 5 in a state where the split cores 2 are joined together. Here, the outer side portion 13 of the tooth portion 3 is provided such that one end 13a in the circumferential direction protrudes beyond the side ends of the inner side portion 11 and the central portion 12 to narrow the circumferential length of the slot 22. . Thereby, the size of the slot 22 is adjusted so that the winding of the stator winding 4 can be prevented and properly accommodated, and the teeth portion 3 is brought close to the stator winding 4 and the winding 4 This makes it possible to improve the heat transfer of the wire and to dissipate the heat generated by the winding 4 more effectively. In FIG. 1, only a part of the stator winding 4 is shown.

  When assembling the stator 1, after the stator winding 4 is wound around each divided core 2, the divided cores 2 are connected to each other in the circumferential direction, and fit to the outer diameter by press fitting or shrink fitting. The stator 1 is integrally formed by fitting into the ring member 25 to be engaged. At this time, the convex part 15 provided in the yoke part 5 of the split core 2 is fitted into the concave part of the adjacent split core, and the circumferential side wall 5a of the yoke part 5 is the central part of the tooth part 3 in the adjacent split core. 12 side walls 12a. Moreover, the outer side part 13 of the teeth part 3 will be in the state closely_contact | adhered to the outer peripheral edge part of the yoke part 5 of an adjacent division | segmentation core at this time. The assembled stator 1 is arranged so as to surround a rotor 26 attached to a rotating shaft (not shown) via a predetermined gap.

  FIG. 7 is a graph showing a magnetic flux distribution in the radial direction in the winding portion of the stator according to the first embodiment. Here, the magnetic flux amount distribution in the A line of the enlarged view of the stator 1 shown in FIG. 8 is shown, and the distances r1 and r2 on the horizontal axis are respectively the winding portions of the stator winding 4 in the yoke portion 5. It corresponds to the position of the peripheral end and the outer peripheral end.

  As shown in FIG. 7, the amount of magnetic flux in the yoke portion 5 of the stator 1 tends to be maximum at the inner peripheral end r1, gradually decreasing from there toward the outer peripheral side, and minimum at the outer peripheral end r2. Show. Therefore, as shown in FIG. 1, in the stator 1 in which the rotor 26 is arranged only on the inner peripheral side, the engaging portion composed of the concave portion 14 and the convex portion 15 is arranged on the outer peripheral side of the yoke portion 5 where the magnetic flux density is minimized. By providing in the vicinity of the end portion, it is possible to suppress the influence of magnetic flux unevenness generated at the fitting position of the concave portion 14 and the convex portion 15 and appropriately maintain the magnetic characteristics of the stator 1.

  FIG. 9 is a graph showing a magnetic flux distribution in the radial direction in the winding portion of the stator according to the second embodiment. Here, the description of the stator according to the second embodiment will be omitted because it has substantially the same configuration as the stator 1 according to the first embodiment shown in FIG. 1, but the rotor is provided only on the outer peripheral side thereof. It differs from the stator 1 of FIG. 1 in that it has a configuration to be arranged.

  As shown in FIG. 9, the amount of magnetic flux in the yoke portion of the stator tends to be minimum at the inner peripheral end r1, gradually increasing from there toward the outer peripheral side, and maximizing at the outer peripheral end r2. Therefore, in the stator in which the rotor is arranged only on the outer peripheral side, the engaging portion provided in each divided core is the inner peripheral side of the yoke portion like the concave portion 34 and the convex portion 35 indicated by imaginary lines in FIG. By providing in the vicinity of the end portion, it is possible to suppress the influence of magnetic flux unevenness generated at the fitting position of the concave portion 34 and the convex portion 35 and to appropriately maintain the magnetic characteristics of the stator.

  FIG. 10 is a graph showing a magnetic flux distribution in the radial direction in the winding portion of the stator according to the third embodiment. Here, since the stator according to the third embodiment has substantially the same configuration as that of the stator 1 according to the first embodiment shown in FIG. 1, the description thereof is omitted. 1 is different from the stator 1 of FIG. 1 in that a rotor is arranged on both sides. In FIG. 10, the distance r3 on the horizontal axis corresponds to the radial center portion of the yoke portion.

  As shown in FIG. 10, the amount of magnetic flux in the yoke portion of the stator tends to gradually decrease from the inner peripheral end r1 and becomes minimum at the central portion r3 of the yoke, and gradually increase from there to the outer peripheral side. Indicates. Therefore, in the stator in which the rotor is arranged on both the inner peripheral side and the outer peripheral side, the engaging portion provided in each divided core is a yoke like the concave portion 44 and the convex portion 45 shown by imaginary lines in FIG. By providing the central portion in the radial direction of the portion, it is possible to suppress the influence of the magnetic flux unevenness generated at the fitting position of the concave portion 44 and the convex portion 45 and appropriately maintain the magnetic characteristics of the stator.

  In the first to third embodiments, the toroidal winding structure according to the present invention is shown when applied to a stator for a radial gap type rotating electrical machine. However, as shown in FIG. The same applies to a stator for an electric machine. In FIG. 11, the same components as those of the stator shown in FIGS. 1 to 5 are denoted by the same reference numerals, and detailed description thereof is omitted. In this case, the shape of each part of the split core 2 is configured to be tapered from the outer peripheral side toward the inner peripheral side. Although not shown here, the lower side portion 13 of the tooth portion 3 that is located on the side opposite to the arrangement side of the rotor 26 (the upper side of the stator 1 in FIG. 11) and does not substantially form a magnetic flux path, As in the case of FIGS. 4 and 5, it is possible to provide an opening so as to penetrate the split core 2 in the longitudinal direction. Moreover, in the structure which has arrange | positioned the rotor 26 below, the opening part similar to the upper part 11 of the teeth part 3 can be provided.

  Although the present invention has been described in detail based on specific embodiments, these embodiments are merely examples, and the present invention is not limited to these embodiments. For example, the shape of the concave portion and the convex portion provided as the locking portion of the split core is not limited to that shown in the embodiment, and it is sufficient that at least the shapes can be fitted to each other. Moreover, although it was set as the structure which made the convex part 15 protrude in the substantially circumferential direction in embodiment, it is also possible to make the same convex part protrude in the radial direction side. Further, in the case of an axial type electric motor in which a rotor and a stator are arranged opposite to each other in the axial direction, the locking portion of the split core may be provided at the end in the axial direction.

  In the stator for a rotating electrical machine having the toroidal winding structure according to the present invention, the locking portion has a magnetic flux density in the radial direction of the winding portion of the winding of the split core (that is, the magnetic flux path formed in the circumferential direction). By providing it in the vicinity of the part where the magnetic field is minimized, it is possible to keep the magnetic characteristics of the stator properly by suppressing the influence of magnetic flux unevenness generated in the locking part, so the rotation with the toroidal winding structure It is useful as a stator for electric machines.

The front view of the stator for rotary electric machines provided with the toroidal winding structure concerning the present invention Perspective view of split core constituting stator Front view showing an example of changing the configuration of the split core Front view showing a configuration example of an opening of a split core The front view which shows another structural example of the opening part of a split core Front view showing an example of changing the configuration of the split core The graph which shows magnetic flux amount distribution in the coil | winding part of the stator which concerns on 1st Embodiment FIG. 1 is an enlarged view of a part of the stator of FIG. The graph which shows magnetic flux amount distribution in the coil | winding part of the stator which concerns on 2nd Embodiment The graph which shows magnetic flux amount distribution in the coil | winding part of the stator which concerns on 3rd Embodiment Perspective view of stator for axial gap type rotating electrical machine

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Stator 2 Divided core 3 Teeth part 4 Stator winding 5, 105a-c Yoke part (winding part)
14, 114 Concave portion 15, 115 Convex portion 21, 22, 121, 122 Slot 25 Ring member 26 Rotor

Claims (9)

A stator for a rotating electrical machine having a toroidal winding structure,
Consists of a plurality of split cores divided in the circumferential direction in units of winding portions around which the stator winding is wound,
Each of the split cores has a locking portion including a concave portion and a convex portion that are fitted to each other so as to restrict relative movement with the adjacent split core,
The stator for a rotating electrical machine, wherein the locking portion is provided at a portion where a magnetic flux density is minimized in a radial direction in the winding portion when an electric current is passed through the stator winding.   2. The rotating electrical machine according to claim 1, wherein when the rotor is disposed only on the inner peripheral side of the stator, the locking portion is provided on an outer peripheral side end of the winding portion. Stator.   2. The rotating electrical machine according to claim 1, wherein when the rotor is disposed only on the outer peripheral side of the stator, the locking portion is provided at an inner peripheral side end of the winding portion. Stator.   The said latching | locking part was provided in the center part of the radial direction of the said winding part, when a rotor is arrange | positioned at the inner peripheral side and outer peripheral side of the said stator. Stator for rotating electrical machines.   When the rotor is disposed only on one side in the axial direction of the stator, the locking portion is provided at an end of the winding portion opposite to the rotor placement side. The stator for a rotating electrical machine according to claim 1.   2. The rotating electrical machine according to claim 1, wherein when the rotor is disposed on both sides in the axial direction of the stator, the locking portion is provided in a central portion in the axial direction of the winding portion. Stator. The split core has a radially extending portion and a circumferential portion extending in the circumferential direction from a radially intermediate portion of the radially extending portion as a winding portion of the stator winding;
When the rotor is disposed on the inner peripheral side or the outer peripheral side of the stator, the radially extending direction portion is positioned on the inner peripheral side or the outer peripheral side of the intermediate portion on the opposite side to the rotor arrangement side. The stator for a rotating electrical machine according to claim 1, wherein a gap is provided in a portion to be operated. The split core has an axially extending portion and a circumferential portion extending in a circumferential direction from an axially intermediate portion of the axially extending portion as a winding portion of the stator winding;
When the rotor is arranged on one side in the axial direction of the stator, the axially extending direction portion is provided with a gap at a portion located on the opposite side to the rotor arrangement side across the intermediate portion. The stator for a rotating electrical machine according to claim 1, wherein the stator is a rotating electrical machine. A stator for a rotating electrical machine having a toroidal winding structure,
It consists of a plurality of divided cores divided in the circumferential direction in units including a predetermined number of winding portions around which the stator winding is wound,
Each of the split cores has a locking portion including a concave portion and a convex portion that are fitted to each other so as to restrict relative movement with the adjacent split core,
The stator for a rotating electrical machine, wherein the locking portion is provided at a portion where a magnetic flux density is minimized in a radial direction in the winding portion when an electric current is passed through the stator winding.

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