JP2009106026A - Rotary electric machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotary electric machine which can reduce leakage flux that arises between a plurality of stator teeth arrayed in its axial direction and can get large torque. <P>SOLUTION: The rotary electric machine is equipped with a rotor 140 and a stator 120 which is formed annularly to surround the rotor 140. The stator 120 comprises a plurality of divided stator cores which are arranged annularly apart. Each divided stator core comprises stator teeth, which project toward the rotor 140, and stator teeth 130, which are formed apart in the axial direction of the stator 120 to the stator teeth so as to project toward the rotor 140, and the stator teeth and the stator teeth 130 are shifted in the circumferential direction of the stator 120. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a rotating electrical machine, and more particularly to a rotating electrical machine including a plurality of divided stator cores.

  Conventionally, various types of rotating electric machines have been proposed for the purpose of reducing the size of the motor and reducing the magnetic field resistance.

  For example, in the revolution motor described in Japanese Patent Application Laid-Open No. 2004-129415, the stator core has a “U” shape opened to the mover side, and the “U” -shaped vertical side Winding is applied to the wire. The stator generates a magnetic flux in the direction of the revolving axis, and revolves by a generated radial force when the magnetic flux is transmitted through an air gap to a movable element facing in the radial direction. The stator core has two protrusions, and magnetic flux is exchanged with the rotor via these protrusions.

  In this revolution motor, as described above, the iron core shape is simple, the revolution motor itself can be reduced in size, and the winding work can be facilitated.

Furthermore, the rotating electrical machine described in Japanese Patent Laid-Open No. 2003-274589 is a rotating electrical machine having a double rotor structure in which an inner rotor and an outer rotor are coaxially arranged on the inner and outer circumferences of the stator. Each of the outer rotor and the inner rotor is provided with a plurality of permanent magnets, and is arranged so as to protrude so as to sandwich the stator coil.
JP 2004-129415 A JP 2003-274589 A

  However, the revolution motor described in Japanese Patent Application Laid-Open No. 2004-129415 has a problem in that magnetic flux leaks between the protrusions of the stator and a large torque cannot be obtained.

  Furthermore, in the rotating electrical machine described in Japanese Patent Application Laid-Open No. 2003-274589, the inner peripheral surface of each stator tooth is arranged in the axial direction of the stator. For this reason, this rotating electrical machine also has a problem that leakage magnetic flux is generated between stator teeth arranged in the axial direction.

  The present invention has been made in view of the above-described problems, and the object thereof is to reduce leakage magnetic flux generated between a plurality of stator teeth arranged in the axial direction and to obtain a large torque. It is to provide a rotating electrical machine.

  A rotating electrical machine according to the present invention includes a rotating shaft that is rotatably supported, a rotor fixed to the rotating shaft, and a stator that is formed in an annular shape so as to surround the periphery of the rotor. The stator includes a plurality of divided stator cores arranged annularly at intervals, and a coil wound around the divided stator core, and the divided stator core includes first stator teeth protruding toward the rotor, The first stator teeth are spaced from each other in the central axis direction of the stator and project toward the rotor. The first stator teeth are positioned between the first stator teeth and the second stator teeth. A coil mounting portion to be wound. Furthermore, it passes through the center of the end face located radially inward of the first stator teeth, passes through the first imaginary straight line parallel to the center axis of the stator, and the center of the end face located radially inward of the second stator teeth. The second virtual straight line parallel to the central axis of the stator is shifted in the circumferential direction of the stator.

  Preferably, the first stator teeth project to extend in one circumferential direction of the stator as it goes inward in the radial direction of the stator, and the second stator teeth go inward in the radial direction of the stator. It protrudes so as to extend toward the other circumferential direction of the stator.

  Preferably, the end face of the first stator teeth and the end face of the second stator teeth are arranged symmetrically with respect to the center line in the circumferential direction of the divided stator core when viewed in plan from the axial direction of the stator.

  Preferably, the rotor includes a plurality of divided rotor cores arranged annularly at intervals along the outer peripheral surface of the rotating shaft. The rotor core includes a first rotor tooth protruding toward the stator and a second rotor tooth formed at a distance from the first rotor tooth in the central axis direction of the rotor and protruding toward the stator. Including. And the end surface located radially outward of the first rotor teeth and the end surface located radially outward of the second rotor teeth are arranged so as to be aligned in the axial direction of the rotor.

  Preferably, the rotor includes a plurality of divided rotor cores arranged annularly at intervals along the outer peripheral surface of the rotating shaft. The rotor core includes a first rotor tooth protruding toward the stator and a second rotor tooth formed at a distance from the first rotor tooth in the central axis direction of the rotor and protruding toward the stator. Including. An end face located radially outward of the first rotor teeth and an end face located radially outward of the second rotor teeth are arranged so as to be displaced in the circumferential direction of the rotor, and the first stator teeth When the end surface positioned radially inward and the end surface positioned radially outward of the first rotor teeth face each other, the end surface positioned radially inward of the second stator teeth and the radial direction of the second rotor teeth It is possible to face the end face located outside.

  According to the rotating electrical machine according to the present invention, it is possible to suppress the occurrence of leakage magnetic flux between the stator teeth arranged in the axial direction, and a large torque can be obtained.

A rotating electrical machine according to an embodiment of the present invention will be described with reference to FIGS.
Note that in the embodiments described below, when referring to the number, amount, and the like, the scope of the present invention is not necessarily limited to the number, amount, and the like unless otherwise specified. In the following embodiments, each component is not necessarily essential to the present invention unless otherwise specified. In addition, when there are a plurality of embodiments below, it is planned from the beginning to appropriately combine the features of each embodiment unless otherwise specified.

(Embodiment 1)
A rotating electrical machine 100 according to the first embodiment will be described with reference to FIGS. 1 to 6. FIG. 1 is a side view of the rotating electrical machine 100 according to the first embodiment, and FIG. 2 is a cross-sectional view taken along the line II-II in FIG. 3 is a cross-sectional view taken along line III-III in FIG. 1, and FIG. 4 is a cross-sectional view taken along line IV-IV in FIG.

  As shown in FIGS. 1 to 4, the rotating electrical machine 100 includes a shaft 110, a rotor 140 fixed to the shaft 110, and a stator 120 that is disposed around the rotor 140 and formed in an annular shape. And.

  The stator 120 includes a plurality of divided stator cores 124 that are annularly arranged at intervals, and stator end plates 121 that are provided at both ends in the axial direction (rotation center line P0 direction) of the stator 120 and fix the divided stator cores 124. , 122.

  Each divided stator core 124 is annularly arranged around the rotation center line P 0 of the shaft 110.

  Here, FIG. 5 is a perspective view of the split stator core 124. As shown in FIG. 5, the split stator core 124 includes a coil mounting portion 128 around which the coil 125 is wound, and both ends of the coil mounting portion 128. Positioned yoke portions 126 and 127, and stator teeth 130 and 131 projecting from the yoke portions 126 and 127 toward the rotor 140 are provided.

  Stator teeth (first stator teeth) 130 and stator teeth (second stator teeth) 131 are spaced from each other in the direction of the rotation center line P0 (the center axis direction of the stator). A coil mounting portion 128 is located between the stator teeth 131.

  Of the surfaces of stator teeth 130, end surface 132 located radially inward of stator 120 is curved in an arc shape so as to follow the surface of rotor 140. Furthermore, among the surfaces of the stator teeth 131, the end surface 133 positioned radially inward of the stator 120 is also curved in an arc shape along the surface of the rotor 140.

  6 is a schematic view when the divided stator core 124 shown in FIG. 5 is viewed in plan from the direction of the rotation center line P0, and FIG. 7 shows the positions of the end surface 132 and the end surface 133 when viewed in plan from the radial direction of the stator 120. It is a schematic diagram which shows a relationship.

  Here, in FIG. 6, when viewed in plan from the direction of the rotation center line P <b> 0, the stator teeth 130 move in the circumferential direction of the stator 120 (one circumferential direction) from the yoke portion 126 toward the inside in the radial direction of the stator 120. The stator teeth 131 project so as to extend in the R2 direction, and project so as to extend in the circumferential direction (the other circumferential direction) R1 of the stator 120 as it goes inward in the radial direction of the stator 120. In the rotating electrical machine 100 according to the first embodiment, the connecting portion between the yoke portion 126 and the stator teeth 130 and the connecting portion between the yoke portion 127 and the stator teeth 131 coincide with the direction of the rotation center line P0.

  Then, as shown in FIG. 7, it passes through the center point Q1 of the end face 133, passes through the virtual straight line (first virtual straight line) P1 parallel to the rotation center line P0, and passes through the center point Q2 of the end face 132 to the rotation center line P0. The parallel virtual straight line (second virtual straight line) P <b> 2 is positioned so as to be shifted in the circumferential direction of the stator 120.

  Thereby, the distance between the end surface 132 and the end surface 133 is longer than the distance between the end surface 132 and the end surface 133 when the end surface 132 and the end surface 133 are aligned in the rotation center line P0 direction. Thereby, when electric power is supplied to the coil 125 and the magnetic flux flows in the divided stator core 124, it is possible to prevent the magnetic flux from directly leaking between the end surface 132 and the end surface 133.

  As described above, since the magnetic flux is prevented from leaking between the end surface 132 and the end surface 133, the amount of magnetic flux flowing between the divided rotor core 154 and the divided stator core 124 can be secured, and the torque of the rotor 140 can be increased. Can be increased.

  The center point Q1 of the end surface 133 is the center of gravity of the end surface 133, and the center point Q2 of the end surface 132 is the center of gravity of the end surface 132.

  Here, in FIG. 6, the stator teeth 130 protrude in the radial direction R <b> 2 of the stator 120 toward the radially inward direction of the stator 120, and the stator teeth 131 go inward in the radial direction of the stator 120. Accordingly, the stator 120 protrudes in the circumferential direction R1. Thus, since the circumferential direction component in the protruding direction of each of the stator teeth 130 and 131 is the opposite direction, the end surface 132 and the end surface 133 can be largely separated. Thereby, the leakage magnetic flux between the end surface 132 and the end surface 133 can be further reduced.

  The virtual straight line O3 is a center line passing through the center of the stator 120 of the divided stator core 124 in the circumferential direction. The center line P3 passes through the center point in the circumferential direction of the stator 120 at the stator teeth 131, the yoke portion 127 and the connection portion, and the center point in the circumferential direction of the stator 120 at the connection portion between the stator teeth 130 and the yoke portion 126. A virtual straight line extending in parallel with the rotation center line P0 is used.

  Further, the virtual straight line O1 passes through the center point Q1 and intersects with the center line P3 perpendicularly, and the virtual straight line O2 passes through the center point Q2 and intersects with the center line P3 perpendicularly. Here, the smaller intersection angle θ1 of the intersection angles of the virtual straight line O1 and the virtual straight line O3 and the smaller intersection angle θ2 of the intersection angles of the virtual straight line O2 and the virtual straight line O3 are equal, and The distance L1 from the center point Q1 to the virtual straight line O3 is equal to the distance L2 from the center point Q2 to the virtual straight line O3. That is, the stator teeth 131 and the stator teeth 130 are formed symmetrically about the virtual straight line O3. For this reason, the assembly of the stator 120 can be facilitated. The split stator core 124 is made of a dust core, for example.

  In FIG. 2, the rotor 140 includes a plurality of divided rotor cores 154 arranged at intervals along the circumferential surface of the shaft 110, a rotor end plate 162 provided on one axial end surface of the rotor 140, and the rotor 140. A rotor end plate 161 shown in FIG. 4 is provided on the other axial end face.

  The rotor end plates 161 and 162 fix the divided rotor cores 154 at a distance from each other. And the division | segmentation rotor core 154 is cyclically | annularly arrange | positioned centering | focusing on the centerline P3.

  As shown in FIGS. 2 to 4, the divided rotor core 154 includes rotor teeth 150 and 151 provided at intervals in a virtual straight line (rotor central axis) P 0 direction, and the rotor teeth (first rotor teeth). ) 150 and a connecting portion 158 located between the rotor teeth (second rotor teeth) 151.

  Here, the rotor yoke portion 156 shown in FIG. 2 is located on one end side of the connecting portion 158, and the rotor teeth 150 protrude from the rotor yoke portion 156 toward the stator 120. Further, the rotor yoke portion 157 shown in FIG. 4 is located on the other end side of the connecting portion 158, and the rotor teeth 151 protrude from the rotor yoke portion 157 toward the stator 120.

  Here, the rotor teeth 151 project so as to extend in the circumferential direction R2 as it goes outward in the radial direction of the rotor 140, and the rotor teeth 150 move toward the outer side in the radial direction of the rotor 140. It protrudes so as to extend in the direction R1.

  End faces 152 and 153 located radially outward of the rotor teeth 150 and 151 are formed in an arc shape in the circumferential direction.

  When end surface 152 located radially outward of rotor teeth 150 faces end surface 132 of stator teeth 130, end surface 153 of rotor teeth 151 faces end surface 133 of stator teeth 131.

  For this reason, for example, when electric power is supplied to the coil 125 and magnetic flux is generated in the split stator core 124, this magnetic flux enters the stator teeth 130 from the yoke portion 126 of the split stator core 124 in FIG. The end surface 152 is reached through the gap. Thereafter, the magnetic flux enters the rotor teeth 150 and the rotor yoke portion 156 described above. Thereafter, in FIG. 3, the rotor yoke 151 reaches the rotor tooth 151 through the connecting portion 158. In FIG. 5, the air reaches the end surface 133 from the end surface 153 through the air gap, and circulates again through the stator teeth 131 and the yoke portion 127.

  When the magnetic flux flows in this way, the rotor 140 is pulled so that the path length of the magnetic flux path is shortened. When substantially the entire end surfaces 152 and 153 of the rotor teeth 150 and 151 are opposed to substantially the entire end surfaces 132 and 133 of the stator teeth 130 and 131, the power supply to the coil 125 of the divided stator core 124 is stopped. Then, the electric power is supplied to the coil 125 of the other divided stator core 124, so that the rotor 140 is attracted again in the rotation direction.

  When end face 152 of rotor teeth 150 faces end face 132 of stator teeth 130, end face 153 of rotor teeth 151 faces end face 133 of stator teeth 131, so rotor teeth 150 and 151 are stator teeth. While approaching 130 and 131, the magnetic flux path is gradually shortened, and the magnetic resistance due to the air gap is reduced. For this reason, the attractive force attracted increases as the end surfaces 152 and 153 come closer to the end surfaces 132 and 133, and a large torque can be obtained.

  Each of the divided stator cores 124 is arranged in the circumferential direction of the stator 120 at an interval, and even when power is supplied to the coil 125 of one divided stator core 124, the magnetic flux flowing in the divided stator core 124 is Leakage to adjacent split stator cores 124 is suppressed.

  Similarly, since the divided rotor cores 154 are also arranged at intervals in the circumferential direction of the rotor 140, the magnetic flux that has entered one divided rotor core 154 is suppressed from leaking into the other divided rotor core 154. ing.

  Here, each of the stator end plates 121 and 122 and the rotor end plates 161 and 162 is made of a nonmagnetic material, and is divided into other parts via the stator end plates 121 and 122 and the rotor end plates 161 and 162. Leakage of magnetic flux to the stator core 124 and the split rotor core 154 is suppressed.

  That is, the magnetic flux generated by supplying electric power to the coil 125 is circulated between the divided stator core 124 around which the coil 125 is wound and the divided rotor core 154 facing the divided stator core 124. The resistance is reduced. Thereby, a large torque can be obtained.

(Embodiment 2)
The rotating electrical machine 100 according to the second embodiment will be described with reference to FIGS. 8 and 9 and FIG. 1 as appropriate. In addition, about the structure which is the same as that of the structure shown by the said FIGS. 1-7, and an equivalent structure, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  FIG. 8 is a cross-sectional view of the rotating electrical machine according to the second embodiment, and is a cross-sectional view corresponding to the cross section taken along the line II-II in FIG. FIG. 9 is a cross-sectional view of the rotating electrical machine according to the second embodiment, and is a cross-sectional view corresponding to the cross section taken along line III-III in FIG.

  As shown in FIG. 8 and FIG. 9, the rotor 140A includes a plurality of divided rotor cores 154A. And a rotor tooth 150A that protrudes radially outward from the rotor yoke portion 156A.

  Both the rotor teeth 150A and the rotor teeth 151A protrude in the radial direction of the rotor 140A, and the end surface 152A of the rotor teeth 150A and the end surface 153A of the rotor teeth 151A are in the direction of the central axis (rotation center line of the rotor 140A). They are arranged so that they are aligned in the (P0 direction).

  Therefore, when the entire end surface 133 of the stator teeth 131 and the entire end surface 153A of the rotor teeth 151A face each other, the end surface 153A of the rotor teeth 150A rotates the rotor 140 with respect to the end surface 132 of the stator teeth 130. The direction is shifted backward.

  For this reason, when electric power is supplied to the coil 125 of one split stator core 124 and the split rotor core 154A located radially inward with respect to the split stator core 124 is attracted in the rotational direction of the rotor 140, the rotor There is a difference between the timing at which the teeth 151A are attracted to the stator teeth 131 and the timing at which the rotor teeth 150A are attracted to the stator teeth 130.

  Specifically, when the width direction center of the end surface 153A of the rotor teeth 151A is located on the rear side in the rotation direction of the rotor 140 with respect to the center of the end surface 133 of the stator teeth 131, the end surface of the stator teeth 130 The center in the width direction of the end surface 152 </ b> A of the rotor teeth 150 </ b> A is also located rearward in the rotational direction of the rotor 140 with respect to the center in the width direction of 132.

  At this time, the distance between the center in the width direction of the end surface 132 and the center in the width direction of the end surface 152A is longer than the distance between the center in the width direction of the end surface 133 and the center in the width direction of the end surface 153A. The attractive force applied is greater than the attractive force applied to the rotor teeth 150A.

  When the center in the width direction of the end surface 133 of the stator teeth 131 and the center in the width direction of the end surface 153A of the rotor teeth 151A coincide with each other in the radial direction, the rotor is located with respect to the center in the width direction of the end surface 132 of the stator teeth 130. The center in the width direction of the end surface 152 </ b> A of the tooth 150 </ b> A is located behind the rotation direction of the rotor 140.

  At this time, the attractive force applied to the rotor teeth 151A is substantially maximum, while the attractive force applied to the teeth 150A is smaller than the attractive force applied to the rotor teeth 151A.

  Thereafter, when the center in the width direction of the end surface 153A of the rotor teeth 151A is located on the front side in the rotation direction of the rotor 140 with respect to the center in the width direction of the end surface 133 of the stator teeth 131, the width direction of the end surface 132 of the stator teeth 130 is reached. The center and the width direction center of the end face 152A of the rotor teeth 150A are close to or coincide with each other.

  At this time, the rotor teeth 151 </ b> A are attracted toward the direction opposite to the rotation direction of the rotor 140, while the rotor teeth 150 </ b> A are attracted in the rotation direction of the rotor 140.

  As described above, the timing of the attracting force applied to the rotor teeth 150A and the rotor teeth 151A is shifted, so that there is a large variation in the resultant force of the attracting force applied to the rotor teeth 150A and the attracting force applied to the rotor teeth 151A. It is possible to suppress the occurrence. Thereby, it is possible to suppress a large variation in the attractive force applied to the divided rotor core 154, to reduce the torque ripple generated in the rotor 140, and to reduce vibration and noise.

  Although the embodiment of the present invention has been described above, it should be considered that the embodiment disclosed this time is illustrative and not restrictive in all respects. The scope of the present invention is defined by the terms of the claims, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims. Furthermore, the above numerical values are examples, and are not limited to the above numerical values and ranges.

  The present invention can be applied to a rotating electrical machine, and is particularly suitable for a rotating electrical machine including a plurality of divided stator cores.

It is a side view of the rotary electric machine which concerns on this Embodiment 1. FIG. It is sectional drawing in the II-II line of FIG. It is sectional drawing in the III-III line of FIG. It is sectional drawing in the IV-IV line of FIG. It is a perspective view of a division | segmentation rotor core. FIG. 6 is a schematic diagram when the divided stator core shown in FIG. 5 is viewed in plan from the rotation center line direction. It is a schematic diagram which shows the positional relationship of the end surface at the time of planar view from the radial direction of a stator. It is sectional drawing of the rotary electric machine which concerns on this Embodiment 2, and is sectional drawing corresponding to the cross section in the II-II line of FIG. It is sectional drawing of the rotary electric machine which concerns on this Embodiment 2, and is sectional drawing corresponding to the cross section in the III-III line of FIG.

Explanation of symbols

  100 rotating electric machine, 110 shaft, 120 stator, 121 stator end plate, 122 stator end plate, 124 split stator core, 125 coil, 126 yoke part, 127 yoke part, 128 coil mounting part, 130 stator tooth, 131 stator tooth, 132 end face 133 End face, 140 rotor, 150 rotor teeth, 151 rotor teeth, 152 end face, 153 end face, 154 divided rotor core, 156 rotor yoke part, 157 rotor yoke part, 158 connecting part, 161 rotor end plate, 162 rotor end plate.

Claims (5)

A rotating shaft rotatably supported;
A rotor fixed to the rotating shaft;
An annularly formed stator so as to surround the rotor,
The stator includes a plurality of divided stator cores arranged annularly at intervals, and a coil wound around the divided stator cores,
The split stator core is formed with a first stator tooth projecting toward the rotor, and a second stator projecting toward the rotor, spaced from the first stator tooth in the central axis direction of the stator. Including a tooth, and a coil mounting portion that is positioned between the first stator tooth and the second stator tooth and around which the coil is wound,
A first imaginary straight line that passes through the center of the end face located radially inward of the first stator teeth and is parallel to the center axis of the stator, and the center of the end face located radially inward of the second stator teeth. A rotating electrical machine in which a second imaginary straight line parallel to the central axis of the stator is shifted in the circumferential direction of the stator.   The first stator teeth protrude toward the inner circumferential direction of the stator so as to extend toward one circumferential direction of the stator, and the second stator teeth extend toward the inner radial direction of the stator. The rotating electrical machine according to claim 1, wherein the rotating electrical machine protrudes toward the other circumferential direction of the stator.   The end surface of the first stator teeth and the end surface of the second stator teeth are arranged symmetrically with respect to the center line in the circumferential direction of the divided stator core when viewed in plan from the axial direction of the stator. The rotating electrical machine described in 1. The rotor includes a plurality of divided rotor cores arranged annularly at intervals along the outer peripheral surface of the rotating shaft,
The rotor core includes first rotor teeth protruding toward the stator;
A second rotor tooth that is formed at an interval in the central axis direction of the rotor with respect to the first rotor tooth and protrudes toward the stator;
The end face located radially outward of the first rotor teeth and the end face located radially outward of the second rotor teeth are arranged so as to be aligned in the axial direction of the rotor. Item 4. The rotating electrical machine according to any one of Items 3 to 3. The rotor includes a plurality of divided rotor cores arranged annularly at intervals along the outer peripheral surface of the rotating shaft,
The rotor core includes first rotor teeth protruding toward the stator;
A second rotor tooth that is formed at an interval in the central axis direction of the rotor with respect to the first rotor tooth and protrudes toward the stator;
An end face located radially outward of the first rotor teeth and an end face located radially outward of the second rotor teeth are arranged so as to be displaced in the circumferential direction of the rotor, and the first stator teeth When the end face located radially inward of the first rotor teeth faces the end face located radially outward of the first rotor teeth, the end face located radially inward of the second stator teeth and the second rotor The rotating electrical machine according to any one of claims 1 to 3, wherein an end face located radially outward of the teeth can be opposed.

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