JP2009095070A - Rotary electric motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a high efficiency rotary electric motor by reducing eddy current loss. <P>SOLUTION: A stator core 7 is constituted by arranging first and second stator cores 8 and 9, having teeth 8b and 9b defining slots 8c and 9c opening to the inner circumferential side arranged, at an equiangular pitch, in the circumferential direction while projecting radially inward from the inner circumferential surface of cylindrical core backs 8a and 9a, coaxially while spacing apart by a predetermined distance in the axial direction and matching the circumferential positions of the teeth 8b and 9b. A core 12 for axial magnetic path constituted by laminating magnetic steel plates is extended in the axial direction to connect between the core backs 8a and 9a of the first and second stator cores 8 and 9, and a field coil 15 made by winding a conductor wire into the shape of a ring is set on the inner diameter side of the core 12 for axial magnetic path coaxially therewith between the core backs 8a and 9a of the first and second stator cores 8 and 9. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a rotary motor used in, for example, an electric supercharger for automobiles, and more particularly to an axial direction that magnetically connects between core backs of two stator cores that are coaxially spaced apart in the axial direction. The present invention relates to the structure of a magnetic path core.

  The armature of a conventional AC machine is formed with three ring-shaped iron cores having a plurality of teeth formed at an equiangular pitch along the circumferential direction on the inner wall surface, and the three ring-shaped iron cores are electrically 120 °. Two ring coils are interposed between the three ring-shaped iron cores so that they are coaxial with the core, and the two ring coils are V-connected. And connected to a three-phase power source, and the outer walls of three ring-shaped iron cores are connected by a yoke (see, for example, Patent Document 1).

Japanese Utility Model Laid-Open No. 01-144771

  In the conventional AC machine armature, the yoke that magnetically connects the outer walls of the three ring-shaped iron cores is made of a lump, so that a large eddy current loss occurs and the efficiency decreases. was there.

  The present invention has been made to solve such a problem, and is an axial direction for magnetically connecting between core backs of two stator cores arranged coaxially with a predetermined distance apart in the axial direction. An object of the present invention is to obtain a high-efficiency rotary motor by configuring a magnetic path core with a laminated iron core to reduce eddy current loss.

  The rotary electric motor according to the present invention is in contact with a frame, a rotor that is coaxially fixed to a rotation shaft supported by the frame and rotatably disposed in the frame, an inner peripheral wall surface of the frame, and A stator core disposed coaxially so as to surround the rotor and held by the frame; a stator having a torque generating drive coil wound around the stator core; and a field magnetomotive force A generating coil. Each of the stator cores is made by laminating magnetic steel plates, and teeth defining a slot opening on the inner peripheral side project radially inward from the inner peripheral surface of the cylindrical core back. First and second stator cores arranged at equiangular pitches in the circumferential direction are arranged coaxially with a predetermined distance apart in the axial direction and with the circumferential positions of the teeth aligned. Yes. Furthermore, an axial magnetic path core configured by laminating magnetic steel plates is extended in the axial direction to connect between the core backs of the first stator core and the second stator core, The field magnetomotive force generating coil is produced by winding a conductor wire in a ring shape, and the axial magnetic path core between the core backs of the first stator core and the second stator core facing each other. A coaxial core is interposed on the inner diameter side.

  According to this invention, the axial magnetic path core that magnetically connects the core backs of the two stator cores arranged coaxially with a predetermined distance apart in the axial direction is formed by laminating magnetic steel plates. Therefore, eddy current loss is reduced and efficiency can be increased.

Embodiment 1 FIG.
1 is a partially broken perspective view showing a rotary electric motor according to Embodiment 1 of the present invention, FIG. 2 is an exploded perspective view showing the rotary electric motor according to Embodiment 1 of the present invention, and FIG. 3 is an embodiment of the present invention. It is sectional drawing which shows the rotary electric motor which concerns on form 1. For convenience, the frame is omitted in FIG. 1, and the rotor is omitted in FIG.

  In FIG. 1 to FIG. 3, the rotary motor 100 is a magnetic inductor type synchronous rotary machine, and is arranged coaxially so as to surround the rotor 2 and the rotor 2 fixed coaxially to the rotary shaft 1. The stator core 7 is wound with a stator coil 10 serving as a torque generating drive coil, the field coil 15 serving as a field magnetomotive force generating coil, and a metal such as iron. And a frame 16 configured to house and hold the rotor 2, the stator 6, and the field coil 15 therein.

  The rotor 2 is produced by laminating and integrating a predetermined number of magnetic steel plates and the first and second magnetic bodies 3 and 4 produced by laminating and integrating a number of magnetic steel plates formed in a predetermined shape, for example, And a disk-shaped partition wall 5 having a rotation shaft insertion hole drilled at the axial center position. The first and second magnetic bodies 3 and 4 are formed in the same shape, and are cylindrical base portions 3a and 4a each having a rotation shaft insertion hole formed at the axial center position, and radial directions from the outer peripheral surfaces of the base portions 3a and 4a. It is constituted by four salient poles 3b, 4b that are provided so as to project outward and extend in the axial direction and are provided at equiangular pitches in the circumferential direction. The first and second magnetic bodies 3, 4 are arranged at a semi-salient pitch shift in the circumferential direction, are arranged in close contact with each other via the partition wall 5, and the rotary shaft 1 inserted through these rotary shaft insertion holes. It is fixed and configured.

  The stator core 7 includes first and second stator cores 8 and 9 that are produced by laminating and integrating a large number of magnetic steel plates formed in a predetermined shape. The first stator core 8 includes a cylindrical core back 8a, and teeth 8b that are provided radially inward from the inner peripheral surface of the core back 8a and that are provided at six equiangular pitches in the circumferential direction. Prepare. A slot 8c opened to the inner peripheral side is defined between adjacent teeth 8b in the circumferential direction. A concave groove 8d having a rectangular cross section is recessed in the core back 8a and extends in the axial direction so as to open to the outer peripheral side at a radially outward position of each slot 8c. That is, six concave grooves 8d are provided at an equiangular pitch in the circumferential direction.

  The second stator core 9 is made in the same shape as the first stator core 8, and has a cylindrical core back 9a and a radially inward projecting from the inner peripheral surface of the core back 9a. And 6 teeth 9b provided at an angular pitch. A slot 9c that opens to the inner peripheral side is defined between adjacent teeth 9b in the circumferential direction. A concave groove 9d having a rectangular cross section is recessed in the core back 9a and extends in the axial direction so as to open to the outer peripheral side at a radially outward position of each slot 9c. That is, six concave grooves 9d are provided at an equiangular pitch in the circumferential direction.

The first and second stator cores 8 and 9 configured as described above are arranged coaxially between the axial thickness separations of the partition walls 5 with the circumferential positions of the teeth 8b and 9b being matched. The first and second magnetic bodies 3 and 4 are surrounded.
The axial magnetic path core 12 is formed in a rectangular parallelepiped by laminating and integrating a predetermined number of magnetic steel plates 14. The axial direction magnetic path core 12 and the magnetic steel sheet 14 are aligned and aligned in the radial direction, and are accommodated and fixed in the concave grooves 8d and 9d facing the axial direction, and the first and second stator cores 8 and 8 Nine core backs 8a and 9a are installed. Thereby, the core backs 8a and 9a of the first and second stator cores 8 and 9 are magnetically coupled by the axial magnetic path core 12 at six locations in the circumferential direction.

The stator coil 10 has a six-phase coil 11 wound in a so-called concentrated winding method, wound around teeth 8b and 9b that make a pair in the axial direction without straddling the slots 8c and 9c. . In FIG. 1, only the one-phase coil 11 wound in a concentrated manner around the pair of teeth 8b and 9b is shown. However, the stator coil 10 actually has six pairs of teeth 8b and 9b. On the other hand, the three phases U, V, and W are sequentially repeated twice and wound in concentrated winding.
The field coil 15 is formed by winding a conductor wire in a ring shape, and is coaxial with the inner diameter side of the core 12 for the axial magnetic path between the core backs 8a and 9a of the first and second stator cores 8 and 9. It is intervened in the heart.

  In the rotary motor 100, the rotor 2 is rotatably supported by the pair of end plates of the frame 16 with the rotary shaft 1 being pivotally supported, and the stator 6 is disposed coaxially so as to surround the rotor 2. It is configured to be press-fitted and held in the cylindrical portion of the frame 16.

The operation of the rotary electric motor 100 configured as described above will be described.
In the rotary electric motor 100, when the field coil 15 is energized, it flows from the salient poles 3b of the first magnetic body 3 to the first stator core 8 as shown by arrows in FIG. A magnetic flux that flows axially through the road core 12 and returns from the second stator core 9 to the salient poles 4b of the second magnetic body 4 is formed. At this time, since the salient poles 3b and 4b of the first and second magnetic bodies 3 and 4 are shifted by a half salient pole pitch in the circumferential direction, when viewed from the axial direction, the magnetic flux is in the circumferential direction. It acts as if they were arranged alternately. Thereby, the rotary electric motor 100 operates as a non-commutator motor, and magnetically operates in the same manner as an 8-pole 6-slot concentrated winding type permanent magnet type rotating electrical machine.

  In the first embodiment, the axial magnetic path core 12 that magnetically connects the core backs 8a and 9a of the first and second stator cores 8 and 9 is formed of a laminated body of magnetic steel plates 14. The eddy current loss is reduced, and a highly efficient rotary electric motor 100 can be realized.

Further, since the frame 16 is disposed in close contact with the outer periphery of the stator core 7, heat generated in the stator coil 10 and the field coil 15 is radiated from the outer surface of the frame 16 through the stator core 7. The excessive temperature rise of the stator 6 and the field coil 15 is suppressed.
In addition, since the axial magnetic path core 12 is housed in the recessed grooves 8d and 9d formed in the outer peripheral wall surfaces of the core backs 8a and 9a, the stress when the stator core 7 is press-fitted into the frame 16 Acts on the axial magnetic path core 12 from both sides in the circumferential direction. At this time, since the lamination direction of the magnetic steel plates 14 of the axial magnetic path core 12 coincides with the radial direction, deformation of the axial magnetic path core 12 due to stress can be suppressed. Thereby, the position shift of the circumferential direction of the 1st and 2nd stator cores 8 and 9 is prevented, and the characteristic dispersion | variation for every product can be decreased.

  Next, the magnetic effect by using the axial magnetic path core 12 whose radial direction is the lamination direction of the magnetic steel plates 14 will be described with reference to FIGS. 4 and 5. FIG. FIG. 4 is a view for explaining the flow of magnetic flux in the rotary electric motor according to Embodiment 1 of the present invention. FIG. 4 (a) is a view of the stator as viewed from the first stator core side, and FIG. FIG. 4B is a view of the stator as viewed from the outside in the radial direction, and FIG. 4C is a view of the stator as viewed from the second stator core side. FIG. 5 is a view for explaining the flow of magnetic flux when the axial magnetic path core is located radially outward of the slot in the rotary electric motor according to Embodiment 1 of the present invention. FIG. FIG. 5B is a view of the stator as viewed from the outside in the radial direction, and FIG. 5C is a view of the stator as viewed from the second stator core side. FIG. In FIGS. 4 and 5, an alternate long and short dash line arrow indicates the flow of magnetic flux.

First, the flow of magnetic flux when the axial magnetic path core 12 whose radial direction is the lamination direction of the magnetic steel plates 14 is located radially outward of the slots 8c and 9c will be described.
The magnetic flux generated by the field coil 15 enters the teeth 8b of the first stator core 8 from the salient poles 3b of the first magnetic body 3 through a gap. The magnetic flux that has flowed into the teeth 8b flows radially outward in the teeth 8b to reach the core back 8a, as indicated by arrows in FIG. 4A, and the flow direction in the core back 8a is circumferential in the circumferential direction. It flows to the groove 8d while changing. Then, as indicated by arrows in FIG. 4B, the magnetic flux flows into the axial magnetic path core 12 from the circumferential direction, and the core back of the second stator core 9 is axially passed through each magnetic steel plate 14. It flows to the 9a side. Then, as indicated by an arrow in FIG. 4C, the magnetic flux flows out from the magnetic steel plates 14 of the axial magnetic path core 12 in the circumferential direction, enters the core back 9a, and flows in the core back 9a. It changes to the teeth 9b while changing the direction to the radial direction, flows inwardly in the teeth 9b, and flows into the salient poles 4b of the second magnetic body 4 through the gap from the tip of the teeth 9b.

Next, the flow of magnetic flux when the axial magnetic path core 12 whose radial direction is the lamination direction of the magnetic steel plates 14 is positioned radially outward of the teeth 8b and 9b will be described.
The magnetic flux generated by the field coil 15 enters the teeth 8b of the first stator core 8 from the salient poles 3b of the first magnetic body 3 through a gap. As indicated by arrows in FIG. 5A, the magnetic flux flowing into the teeth 8b flows radially outward in the teeth 8b to reach the core back 8a, and branches in the core back 8a to both sides in the circumferential direction. And flows to both sides in the circumferential direction of the concave groove 8d. Then, as indicated by arrows in FIG. 5B, the magnetic flux flows into the axial magnetic path core 12 from both sides in the circumferential direction, and the core of the second stator core 9 in the magnetic steel plate 14 in the axial direction. It flows to the back 9a side. Then, as indicated by arrows in FIG. 5C, the magnetic flux flows out from each magnetic steel plate 14 of the axial magnetic path core 12 to both sides in the circumferential direction, enters the core back 9a, and passes through the core back 9a. While changing the flow direction to the radial direction, it flows to the teeth 9b on both sides in the circumferential direction, flows in the teeth 9b radially inward, and flows into the salient poles 4b of the second magnetic body 4 through the gaps from the tips of the teeth 9b. .

As described above, when the axial magnetic path core 12 whose radial direction is the lamination direction of the magnetic steel plates 14 is positioned radially outward of the teeth 8b and 9b, the core 8 for the magnetic flux flows into the core back 8a from the teeth 8b. The magnetic flux branches to both sides in the circumferential direction, flows in the inner diameter side of the axial magnetic path core 12 in the circumferential direction, and flows in from both sides in the circumferential direction of the axial magnetic path core 12. That is, the magnetic flux flows around the core back 8a. On the other hand, when the axial magnetic path core 12 whose radial direction is the lamination direction of the magnetic steel plates 14 is positioned radially outward of the slots 8c and 9c, the magnetic flux does not bypass the core back 8a. It flows to the axial magnetic path core 12 through the shortest path.
Therefore, from the viewpoint of shortening the path of the magnetic flux, it is preferable to dispose the axial magnetic path core 12 whose radial direction is the lamination direction of the magnetic steel plates 14 radially outward of the slots 8c and 9c.

Embodiment 2. FIG.
6 is a sectional view showing a rotary electric motor according to Embodiment 2 of the present invention.
In FIG. 6, the axial magnetic path core 13 is formed in a rectangular parallelepiped by laminating and integrating a predetermined number of magnetic steel plates 14. The axial magnetic path core 13 is housed and fixed in the concave grooves 8d and 9d facing the axial direction so that the lamination direction of the magnetic steel plates 14 coincides with the circumferential direction, and the first and second stator cores 8 are fixed. , 9 between the core backs 8a, 9a. Thereby, the core backs 8a and 9a of the first and second stator cores 8 and 9 are magnetically coupled by the axial magnetic path core 13 at six locations in the circumferential direction. Further, a flat surface is formed on the inner peripheral wall surface of the cylindrical portion of the frame 16 so as to contact each axial magnetic path core 13.
Other configurations are the same as those in the first embodiment.

  Also in the rotary electric motor 101 configured as described above, the axial magnetic path core 13 that magnetically connects the core backs 8 a and 9 a of the first and second stator cores 8 and 9 is a laminated body of magnetic steel plates 14. Since it is configured, eddy current loss is reduced.

  The thermal conductivity in the stacking direction of the magnetic steel sheet 14 of the axial magnetic path core 13 is significantly smaller than the thermal conductivity of the magnetic steel sheet 14 constituting the axial magnetic path core 13. Therefore, since the lamination direction of the magnetic steel plates 14 of the axial magnetic path core 13 coincides with the circumferential direction, the heat transferred to the axial magnetic path core 13 through the core backs 8a and 9a is axial. The inside of each magnetic steel plate 14 constituting the magnetic path core 13 is transmitted in the radial direction and is radiated from the frame 16.

On the other hand, in the axial magnetic path core 12 whose radial direction is the lamination direction of the magnetic steel plates 14, the heat transferred to the axial magnetic path core 12 via the core backs 8a and 9a is used for the axial magnetic path. Without being transmitted to the core 13, it is transmitted around the core backs 8 a and 9 a along the axial magnetic path core 12, and is radiated from the frame 16. Further, even if heat is transferred from the inner diameter side into the axial magnetic path core 12, the heat is not transferred in the radial direction (stacking direction) through the axial magnetic path core 12, and the inside of each magnetic steel plate 14 is not transmitted. It is transmitted in the circumferential direction and transmitted from the core backs 8a, 9a to the frame 16.
Therefore, it is preferable that the lamination direction of the magnetic steel plates 14 is the circumferential direction from the viewpoint of improving heat dissipation.

  Further, since the axial magnetic path core 13 having the circumferential direction of the lamination direction of the magnetic steel plates 14 is disposed radially outward of the slots 8c and 9c, the heat generated in the slots 8c and 9c is efficiently radiated. It is possible to suppress an excessive temperature rise of the stator coil 10.

  Next, the magnetic effect by using the axial magnetic path core 13 whose circumferential direction is the lamination direction of the magnetic steel plates 14 will be described with reference to FIGS. FIG. 7 is a view for explaining the flow of magnetic flux in the rotary electric motor according to Embodiment 2 of the present invention. FIG. 7 (a) is a view of the stator as viewed from the first stator core side, and FIG. FIG. 7B is a view of the stator as viewed from the outside in the radial direction, and FIG. 7C is a view of the stator as viewed from the second stator core side. FIG. 8 is a diagram for explaining the flow of magnetic flux when the axial magnetic path core is located radially outward of the slot in the rotary electric motor according to Embodiment 2 of the present invention. FIG. FIG. 8B is a diagram of the stator viewed from the outside in the radial direction, and FIG. 8C is a diagram of the stator viewed from the second stator core side. FIG. In FIG. 7 and FIG. 8, the dashed-dotted arrow indicates the flow of magnetic flux.

First, the flow of magnetic flux in the case where the axial magnetic path core 13 whose circumferential direction is the lamination direction of the magnetic steel plates 14 is located radially outward of the slots 8c and 9c will be described.
The magnetic flux generated by the field coil 15 enters the teeth 8b of the first stator core 8 from the salient poles 3b of the first magnetic body 3 through a gap. The magnetic flux that has flowed into the teeth 8b flows radially outward in the teeth 8b to reach the core back 8a as indicated by arrows in FIG. 7A, and the flow direction in the core back 8a is circumferential in the circumferential direction. It changes and flows to the inner diameter side of the concave groove 8d. Then, as indicated by an arrow in FIG. 7B, the magnetic flux flows into the axial magnetic path core 13 from the radially inner side, and the core of the second stator core 9 in the magnetic steel plate 14 in the axial direction. It flows to the back 9a side. Then, as indicated by an arrow in FIG. 7 (c), the magnetic flux flows out from each magnetic steel sheet 14 of the axial magnetic path core 13 to the inner diameter side, enters the core back 9a, and goes around the core back 9a. Flows in the direction to the teeth 9b, flows inward in the teeth 9b in the radial direction, and flows into the salient poles 4b of the second magnetic body 4 from the tips of the teeth 9b through a gap.

Next, the flow of magnetic flux in the case where the axial magnetic path core 13 whose circumferential direction is the lamination direction of the magnetic steel plates 14 is located radially outward of the teeth 8b and 9b will be described.
The magnetic flux generated by the field coil 15 enters the teeth 8b of the first stator core 8 from the salient poles 3b of the first magnetic body 3 through a gap. The magnetic flux flowing into the teeth 8b flows radially outward in the teeth 8b and further radially outward in the core back 8a as indicated by arrows in FIG. Flows up. Then, as indicated by an arrow in FIG. 8B, the magnetic flux flows into the axial magnetic path core 13 from the inner diameter side, and the core back of the second stator core 9 in the magnetic steel plate 14 in the axial direction. It flows to the 9a side. Then, as indicated by an arrow in FIG. 8C, the magnetic flux flows out from each magnetic steel plate 14 of the axial magnetic path core 13 to the inner diameter side, enters the core back 9a, and goes around the core back 9a. Flows in the direction to the teeth 9b, flows inward in the teeth 9b in the radial direction, and flows into the salient poles 4b of the second magnetic body 4 from the tips of the teeth 9b through a gap.

As described above, when the axial magnetic path core 13 having the circumferential direction of the lamination direction of the magnetic steel plates 14 is located radially outward of the slots 8c and 9c, the core flows into the core back 8a from the teeth 8b. The magnetic flux flows in the circumferential direction to the inner diameter side of the concave groove 8d, and flows into the axial magnetic path core 13 from the inner diameter side. Similarly, the magnetic flux flowing into the core back 9a from the inner diameter side of the axial magnetic path core 13 flows in the circumferential direction to the outside in the radial direction of the teeth 9b and flows into the teeth 9b. That is, the magnetic flux flows around the core back 8a. On the other hand, when the axial magnetic path core 13 whose circumferential direction is the lamination direction of the magnetic steel plates 14 is positioned radially outward of the teeth 8b and 9b, the magnetic flux bypasses the core back 8a from the teeth 8b. Without flowing, it flows to the axial magnetic path core 13 through the shortest path, and flows from the axial magnetic path core 13 to the teeth 9b through the shortest path without bypassing the inside of the core back.
Therefore, from the viewpoint of shortening the path of the magnetic flux, it is preferable to dispose the axial magnetic path core 13 having the circumferential direction of the magnetic steel sheet 14 in the radial direction of the teeth 8b and 9b.

  In the second embodiment, the axial magnetic path core 13 is formed in a rectangular parallelepiped shape, a flat surface is formed on the inner peripheral wall surface of the cylindrical portion of the frame 16, and the first and second stator cores 8 and 9 are formed. When pressed into the cylindrical portion of the frame 16, each axial magnetic path core 13 is in close contact with the flat surface formed in the cylindrical portion of the frame 16. When one orthogonal surface is made into a substantially rectangular parallelepiped having a curvature radius equal to the outer peripheral wall surface of the core back of the first and second stator cores, and the first and second stator cores are press-fitted into the cylindrical portion of the frame Each axial magnetic path core may be in close contact with the inner peripheral wall surface of the cylindrical portion of the frame.

Embodiment 3 FIG.
FIG. 9 is a sectional view showing a rotary electric motor according to Embodiment 3 of the present invention.
In FIG. 9, twelve concave grooves 8 d are formed in the outer peripheral wall surface of the first stator core 8 at an equiangular pitch so as to be located radially outward of the teeth 8 b and the slots 8 c. Similarly, although not shown, twelve concave grooves 9d are also formed on the outer peripheral wall surface of the second stator core 9 at equiangular pitches so as to be located radially outward of the teeth 9b and the slots 9c. It is installed. An axial magnetic path core 12 whose radial direction is the lamination direction of the magnetic steel plates 14 is housed and fixed in the concave grooves 8d and 9d positioned radially outward of the slots 8c and 9c. Furthermore, the axial magnetic path core 13 whose circumferential direction is the lamination direction of the magnetic steel plates 14 is housed and fixed in the concave grooves 8d and 9d positioned radially outward of the teeth 8b and 9b.
Other configurations are the same as those in the first embodiment.

Also in the rotary electric motor 102 configured as described above, the axial magnetic path cores 12 and 13 that magnetically connect the core backs 8 a and 9 a of the first and second stator cores 8 and 9 are laminated with the magnetic steel plate 14. Since it is comprised with a body, an eddy current loss is reduced and efficiency improvement is achieved.
Also, the axial magnetic path core 12 whose radial direction is the lamination direction of the magnetic steel plates 14 is the core backs 8a, 9a of the first and second stator cores 8, 9 at positions radially outward of the slots 8c, 9c. The core 13 for the axial magnetic path, which is installed in the middle and the circumferential direction of the lamination direction of the magnetic steel plates 14, is the core back of the first and second stator cores 8 and 9 at positions radially outward of the teeth 8b and 9b. Since it is installed between 8a and 9a, the path | route of magnetic flux can be shortened.

Embodiment 4 FIG.
FIG. 10 is a sectional view showing a rotary electric motor according to Embodiment 4 of the present invention.
In FIG. 10, in the core back 8a of the first stator core 8, six through holes 17 having a rectangular cross section are formed at an equiangular pitch so as to be located radially outward of the slot 8c. . Similarly, although not shown in the figure, the core back 9a of the second stator core 9 also has an equiangular pitch so that six through-holes 17 having a rectangular cross section are located radially outward of the slot 9c. It has been drilled. An axial magnetic path core 12 whose radial direction is the lamination direction of the magnetic steel plates 14 is housed and fixed in each through hole 17.
Other configurations are the same as those in the first embodiment.

Also in the rotary electric motor 103 configured as described above, the axial magnetic path core 12 that magnetically connects the core backs 8 a and 9 a of the first and second stator cores 8 and 9 is a laminate of the magnetic steel plates 14. Since it is configured, eddy current loss is reduced and high efficiency is achieved.
Further, since the axial magnetic path core 12 is embedded in the core backs 8a and 9a, the outer peripheral wall surface of the first and second stator cores 8 and 9 and the inner peripheral wall surface of the frame 16 are in the entire circumferential direction. Thus, surface contact is achieved, the rigidity is increased, the contact area between the two is increased, and the heat generated in the stator coil 10 and the field coil 15 can be effectively radiated. Further, the circumferential displacement of the first and second stator cores 8 and 9 is prevented.

Embodiment 5 FIG.
FIG. 11 is a side view of a stator for explaining an installed state of an axial magnetic path core in a rotary electric motor according to Embodiment 5 of the present invention.
In FIG. 11, the locking groove 18 extends from a part of the groove 8d provided in the outer peripheral wall surface of the core back 8a of the first stator core 8 to both sides in the circumferential direction at the same groove depth as the groove 8d. It is installed. Similarly, the locking groove 19 extends from both of the grooves 9d formed in the outer peripheral wall surface of the core back 9a of the second stator core 9 to both sides in the circumferential direction with the same groove depth as the groove 9d. Has been. An axial magnetic path core 20 produced in a rectangular parallelepiped made by laminating and integrating magnetic steel plates 14 is fitted with locking projections 21 and 22 projecting on both side surfaces thereof into locking grooves 18 and 19. Thus, the locking projections 21 and 22 are housed and fixed in the concave grooves 8d and 9d with the lamination direction of the magnetic steel plates 14 as the radial direction.
Other configurations are the same as those in the first embodiment.

Here, the first and second stator cores 8 and 9 are made of, for example, magnetic steel plates having a core back portion, a teeth portion, a slot portion, a concave groove portion and a locking concave groove portion formed by press-molding a magnetic thin plate. The magnetic steel plates are laminated and integrated so that the core back portion, the teeth portion, the slot portion, the concave groove portion, and the locking concave groove portion overlap each other. The core back portion, the teeth portion, the slot portion, the concave groove portion, and the locking concave groove portion are continuous in the stacking direction, and the core back 8a, 9a, the teeth 8b, 9b, the slots 8c, 9c, the concave grooves 8d, 9d, and Locking grooves 18 and 19 are formed.
In addition, the axial magnetic path core 20 is made of, for example, a magnetic steel plate 14 having a substantially rectangular flat plate shape having a locking projection formed by press-molding a magnetic thin plate, and the locking projection is overlapped. The steel plates 14 are laminated and integrated. Then, the locking projections 21 and 22 are formed by connecting the locking projections in the stacking direction.

Also in the rotary electric motor 104 configured as described above, the axial magnetic path core 20 that magnetically connects the core backs 8 a and 9 a of the first and second stator cores 8 and 9 is a laminate of the magnetic steel plates 14. Since it is configured, eddy current loss is reduced and high efficiency is achieved.
Further, locking protrusions 21 and 22 protruding from the axial magnetic path core 20 are fitted into locking grooves 18 and 19 recessed in the first and second stator cores 8 and 9. Therefore, the first and second stator cores 8 and 9 can be easily positioned, the assemblability is improved, and the axial movement of the first and second stator cores 8 and 9 is restricted.

Here, in the fifth embodiment, the axial magnetic path core 20 whose radial direction is the lamination direction of the magnetic steel plates 14 is used, but for the axial magnetic path whose circumferential direction is the lamination direction of the magnetic steel plates. A core may be used. In this case, a locking recess is provided at the bottom of the groove of the first and second stator cores, and the locking protrusion that fits into the locking recess is radially inward from the axial magnetic path core. It should just project.
In the fifth embodiment, the locking recess is formed in the groove and the locking protrusion is formed in the axial magnetic path core. However, the locking recess is formed in the axial magnetic path core. The locking protrusions may be formed in the concave grooves.

Embodiment 6 FIG.
FIG. 12 is a side view of a stator for explaining an installed state of an axial magnetic path core in a rotary electric motor according to Embodiment 6 of the present invention.
In FIG. 12, an axial magnetic path core 23 produced in a rectangular parallelepiped made by laminating and integrating magnetic steel plates 14 has positioning protrusions 24 projecting from the center portions on both side surfaces thereof, and the first and second stator cores 8. , 9 in contact with the end surfaces of the opposing core backs 8a, 9a, and the lamination direction of the magnetic steel plates 14 is set in the radial direction, and is housed and fixed in the concave grooves 8d, 9d.
Other configurations are the same as those in the first embodiment.

  The axial magnetic path core 23 is made of, for example, a substantially rectangular flat magnetic steel plate 14 having a locking projection formed by press-molding a magnetic thin plate, and the magnetic steel plates 14 are laminated so that the positioning projections overlap. , Produced integrally. Then, the positioning protrusions 24 are configured by the positioning protrusions being continuous in the stacking direction.

Also in the rotary electric motor 105 configured as described above, the axial magnetic path core 23 that magnetically connects the core backs 8 a and 9 a of the first and second stator cores 8 and 9 is a laminate of the magnetic steel plates 14. Since it is configured, eddy current loss is reduced and high efficiency is achieved.
Further, since the positioning protrusion 24 projecting from the axial magnetic path core 23 is sandwiched between the end surfaces of the core backs 8a, 9a facing each other of the first and second stator cores 8, 9, The positioning of the second stator cores 8 and 9 is facilitated, the assemblability is improved, and the axial movement in the direction in which the first and second stator cores 8 and 9 are close to each other is restricted.

  Here, in the sixth embodiment, the axial magnetic path core 23 whose radial direction is the lamination direction of the magnetic steel plates 14 is used, but for the axial magnetic path whose circumferential direction is the lamination direction of the magnetic steel plates. A core may be used. In this case, the positioning protrusions sandwiched between the opposing core back end faces of the first and second stator cores may be provided so as to protrude radially inward from the axial magnetic path core.

In each of the above embodiments, the first and second magnetic bodies constituting the rotor are manufactured by laminating magnetic steel plates. However, the first and second magnetic bodies are a lump of magnetic steel material. It may be produced by.
Further, in each of the above embodiments, the axial magnetic path core is disposed so as to be located radially outward of each slot or each tooth, but the axial magnetic path core is made of a magnetic steel plate. As long as it is composed of a laminate, the position and number of the axial magnetic path cores are not limited to these.

It is a partially broken perspective view which shows the rotary electric motor which concerns on Embodiment 1 of this invention. It is a disassembled perspective view which shows the rotary electric motor which concerns on Embodiment 1 of this invention. It is sectional drawing which shows the rotary electric motor which concerns on Embodiment 1 of this invention. It is a figure explaining the flow of the magnetic flux in the rotary electric motor which concerns on Embodiment 1 of this invention. It is a figure explaining the flow of the magnetic flux in the case where the axial magnetic path core is located radially outward of the slot in the rotary electric motor according to Embodiment 1 of the present invention. It is sectional drawing which shows the rotary electric motor which concerns on Embodiment 2 of this invention. It is a figure explaining the flow of the magnetic flux in the rotary electric motor which concerns on Embodiment 2 of this invention. In the rotary electric motor which concerns on Embodiment 2 of this invention, it is a figure explaining the flow of the magnetic flux in case the axial direction magnetic path core is located in the radial direction outer side of a slot. It is sectional drawing which shows the rotary electric motor which concerns on Embodiment 3 of this invention. It is sectional drawing which shows the rotary electric motor which concerns on Embodiment 4 of this invention. It is a side view of the stator explaining the installation state of the core for axial direction magnetic paths in the rotary electric motor which concerns on Embodiment 5 of this invention. It is a side view of the stator explaining the installation state of the core for axial direction magnetic paths in the rotary electric motor which concerns on Embodiment 6 of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Rotating shaft, 2 Rotor, 6 Stator, 7 Stator core, 8 1st stator core, 8a Core back, 8b Teeth, 8c Slot, 8d Groove, 9 2nd stator core, 9a Core back, 9b Teeth, 9c slot, 9d concave groove, 10 stator coil (torque generating drive coil), 12, 13, 20, 23 axial magnetic path core, 14 magnetic steel sheet, 15 field coil (for generating field magnetomotive force) Coil), 16 frame, 17 through hole, 18, 19 locking groove, 21, 22 locking projection, 24 positioning projection.

Claims (10)

Frame,
A rotor fixed coaxially to a rotating shaft supported by the frame and rotatably disposed in the frame;
A stator core that is in contact with an inner peripheral wall surface of the frame and is coaxially disposed so as to surround the rotor and is held by the frame, and a torque generating drive coil wound around the stator core A stator having
A field magnetomotive force generating coil,
Each of the stator cores is manufactured by laminating magnetic steel plates, and teeth that define slots that open to the inner peripheral side project radially inward from the inner peripheral surface of the cylindrical core back. The first stator core and the second stator core, which are arranged at an equiangular pitch, are arranged coaxially with a predetermined distance apart in the axial direction and with the circumferential positions of the teeth aligned. ,
An axial magnetic path core configured by laminating magnetic steel plates extends in the axial direction, and connects between the core backs of the first stator core and the second stator core,
The field magnetomotive force generating coil is produced by winding a conductor wire in a ring shape, and the axial magnetic path core between the core backs of the first stator core and the second stator core facing each other. A rotary motor characterized in that it is interposed coaxially on the inner diameter side of the motor.   The rotary electric motor according to claim 1, wherein the axial magnetic path core is arranged with a laminating direction of the magnetic steel plates as a circumferential direction.   3. The rotary electric motor according to claim 2, wherein the axial magnetic path cores are arranged at an equiangular pitch in the circumferential direction so as to be located radially outward of the slots.   The rotary electric motor according to claim 2, wherein the axial magnetic path cores are arranged at an equiangular pitch in the circumferential direction so as to be located radially outward of the teeth.   The rotary electric motor according to claim 1, wherein the axial magnetic path core is arranged with the lamination direction of the magnetic steel plates as a radial direction.   6. The rotary electric motor according to claim 5, wherein the axial magnetic path cores are arranged at an equiangular pitch in the circumferential direction so as to be located radially outward of the slots.   A concave groove is recessed in the outer peripheral wall surface of the core back of the first stator core and the second stator core and extends in the axial direction, and the axial magnetic path core is housed and fixed in the concave groove. The rotary electric motor according to any one of claims 2 to 6, wherein the rotary electric motor is provided.   3. A through hole is formed in the core back of the first and second stator cores in the axial direction, and the axial magnetic path core is housed and fixed in the through hole. The rotary electric motor according to any one of claims 6 to 6.   Positioning protrusions that abut the opposing core back end surfaces of the first stator core and the second stator core and restrict the axial movement of the first stator core and the second stator core are the axial magnetic path The rotary electric motor according to claim 7 or 8, wherein the rotary electric motor is protruded from the core.   A locking projection is formed on one of the concave groove and the axial magnetic path core, and a locking recess is formed on the other of the concave groove and the axial magnetic path core. 8. The rotary electric motor according to claim 7, wherein the axial movement of the first stator core and the second stator core is restricted by fitting in the locking recess.

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