JP5388458B2 - Motor and stator - Google Patents

Description

The present invention relates to a motor including a rotor having salient poles projecting in a radial direction perpendicular to the rotation axis, a stator having the rotor housed therein , and a stay preferably used for such a motor. about the data.

In a motor having a rotor and a stator having the rotor housed therein, conventionally, the rotor is provided with a permanent magnet, the stator is provided with a coil, and the stator coil is sequentially energized to obtain the rotor permanent magnet. A configuration in which an electromagnetic force is generated between them to rotate the rotor has been used (see, for example, Patent Document 1).
JP 2008-22593 A

  In the configuration described in Patent Document 1, a plurality of stator cores are provided in the circumferential direction orthogonal to the rotation axis and a yoke that connects between the outer peripheral portions of the stator cores is provided to generate magnetic lines of force in the stator core in the radial direction orthogonal to the rotation axis. A coil is wound so that a magnetic path that passes through the coil, the yoke, and the rotor and is orthogonal to the rotation axis is formed.

  By the way, in recent years, the entire rotor is made of a magnetic material, the permanent magnet is omitted, the coil of the stator is energized to generate an attractive force with the rotor, and the rotor is rotated by this attractive force. Things are being considered.

  However, even when the entire rotor is made of a magnetic material so as to omit the permanent magnet from the configuration described in Patent Document 1, by forming a magnetic path perpendicular to the rotation axis, a certain coil is radially outward. In order to pass the magnetic flux and the radially inward magnetic flux to pass through another coil, a yoke for connecting between the outer peripheral portion of the stator core and between the magnetic poles of the rotor is indispensable. Nevertheless, this yoke does not contribute directly to torque generation. Therefore, there is a demand for omitting such a yoke and reducing the overall diameter while maintaining the output of such a motor.

  The present invention is configured to solve such problems.

  That is, the motor according to the present invention has a salient pole projecting in the radial direction perpendicular to the rotation axis and a rotor having a magnetic receiving portion at the projecting end of the salient pole; A stator core having a pair of magnetic poles arranged in parallel in the extending direction of the rotation axis, a portion that magnetically connects these magnetic poles and capable of forming a magnetic path with the magnetic receiver, and a magnetic pole of the stator core A motor having a stator having a plurality of coils that are excited to have different polarities in the circumferential direction, and having an outer inclined surface at least at one end in the axial direction on the outer circumferential side of the stator core, An inner inclined surface substantially parallel to the outer inclined surface is provided on the circumferential side, and the coil is wound between the outer inclined surface and the inner inclined surface.

  If this is the case, the coil is excited in parallel with the extending direction of the rotation axis of the stator core so that the magnetic poles provided in a pair have different polarities, and the rotating shaft is connected to the magnetic receiving portion of the rotor. By forming a magnetic path extending in the direction, the magnetic path can be completed only inside the stator core and the rotor. Therefore, a magnetic path can be formed without providing a yoke for connecting the outer peripheral portions of the stator core, and the motor can be reduced in size and weight while maintaining the output. In addition, since it is not necessary to provide a yoke for connecting the magnetic poles in the circumferential direction, the rotor can be reduced in mass and moment of inertia.

  According to the configuration of the motor according to the present invention, the coils are excited in parallel with each other in the extending direction of the rotation axis of the stator core so that the magnetic poles provided in a pair have different polarities. By forming a magnetic path extending in the direction of the rotation axis, the magnetic path can be completed only inside the stator core and the rotor. Therefore, a magnetic path can be formed without providing a yoke for connecting the outer peripheral portions of the stator core, and the motor can be reduced in size and weight while maintaining the output.

  Prior to the description of the present invention, a first reference example related to the present invention will be described below with reference to the drawings.

  The motor M1 according to the present reference example has a stator 1 as shown in FIG. 1 as a perspective view and as shown in FIG. 2 as a front view, and as shown in FIG. A rotor 2 disposed inside the stator 1 and a rotary shaft 3 attached through the center of the rotor 2 are provided. In FIG. 1, in order to clearly illustrate the configurations of the stator 1 and the rotor 2, a bearing portion that rotatably supports the rotating shaft 3, an external connection portion of the coil 5 that constitutes the stator 1, and the like are illustrated. Is omitted.

  The stator 1 includes a stator core 6 and a plurality of coils 5 provided along the inner surface of the stator core 6. The stator 1 is supported by a housing (not shown) for housing the motor M.

  As shown in FIG. 2, the stator core 6 is a dust core formed by compressing, for example, a magnetic powder, and has a substantially rectangular parallelepiped shape in the present reference example. The stator core 6 has a coil slot 6x that is a recess capable of accommodating the coil 5 on the inner peripheral side of the central portion in the axial direction. Here, in this reference example, a total of 12 stator cores 6 are provided at intervals of 30 degrees. The stator core 6 has a pair of magnetic poles 61a and 61b arranged in parallel in the extending direction of the rotation axis, and a connecting portion 62 that magnetically connects the magnetic poles 61a and 61b. The coil slot 6x is formed on the inner peripheral side of the connecting portion 62. In FIG. 3, coils in the conventional stator core are indicated by imaginary lines.

  The coil 5 is accommodated in the coil slot 6x of the stator core 6 described above, and is arranged in a shape surrounding the bottom surface of the coil slot 6x, both side surfaces of the stator core 6, and the outer surface of the stator core 6. Yes. That is, when the coil 5 is energized, a magnetic field in the axial direction is generated. In this reference example, the inner peripheral end face of the coil 5 is substantially flush with the inner peripheral end face of the stator core 6.

  With respect to the stator 1 having such a configuration, the rotor 2 protrudes in a radial direction perpendicular to the axis of the rotary shaft 3 from the core portion 7 with the rotary shaft 3 inserted through the center portion. And the salient poles 8. The salient pole 8 is provided with a magnetic receiving portion 9 extending along the rotation axis 3 at the projecting end.

  In the present reference example, a total of eight salient poles 8 are provided at intervals of 45 degrees.

  The magnetic receiving portion 9 has a plate shape provided by extending in the front-rear direction from the protruding end of the salient pole 8 and is provided at a total of eight locations. The outer surface 9a of the magnetic receiving portion 9 faces the inner surface 6a of the stator core 6 and forms a magnetic path between the coil 5 and the electromagnet formed by the stator core 6 when the coil 5 is energized. To do.

  Then, when the four shafts 5 that are separated from each other by 90 degrees are energized to attract the magnetic receiving portion 9 of the rotor 2 to rotate the rotating shaft 3, the magnetic receiving portion 9 is completely opposed to the coil 5. The motor M is operated by repeating the control of further rotating the rotating shaft 3 by stopping the energization of the coil 5 and energizing the adjacent coil 5 to attract the magnetic receiving portion 9.

  According to such a configuration of the motor M <b> 1, the coil 5 excites the stator core 6 in the rotation axis direction and forms a magnetic path with the magnetic receiving portion 9 of the rotor 2, so that the magnetic path is the stator core of the stator 1. 6 and the inside of the magnetic receiving part 9 of the rotor 2 can be completed. Accordingly, a magnetic path can be formed without providing a yoke for connecting the outer peripheral portions of the stator core 6, and the motor M1 can be reduced in size and weight while maintaining the output. In addition, as shown in the imaginary line in FIG. 3, the length per turn when the coil is wound around the stator core can be shortened as compared with the aspect in which the stator core is excited in the direction orthogonal to the rotation axis. The axial dimension of the stator 1 can be shortened.

  Further, since the magnetic receiving portion 9 of the rotor 2 is provided so as to protrude from the protruding end of the salient pole 8 in the rotational axis direction, the dimension of the magnetic receiving portion 9 in the rotational axis direction is secured while the salient pole 8 The rotor 2 can be reduced in weight by making the dimension in the rotational axis direction smaller than the magnetic receiving portion 9.

  Instead of the rotor 2 according to this reference example, for example, as shown in FIG. 4, a core part X7 in which the axial orthogonal cross-sectional shape is the same in all parts and the rotation shaft 3 is inserted in the center part, Even if a rotor X2 having a salient pole X8 projecting in a radial direction orthogonal to the axis of the rotary shaft 3 from the core part X7 and having a function as a magnetic receiving part X9 near the projecting end surface of the salient pole X8 is adopted. Good. If it is such a structure, a rotor can be formed using a laminated steel plate.

  In addition, as shown in FIG. 5, a core portion Y7 in which the rotation shaft 3 is inserted through the center portion, and salient poles Y8 protruding in the radial direction perpendicular to the axis of the rotation shaft 3 from the core portion Y7. And a rotor Y2 in which the magnetic receiving portion Y9 is extended in only one direction from the protruding end of the salient pole Y8.

  Moreover, as shown in FIG. 6, you may form the magnetic receiving part 9 of the rotor which concerns on this reference example using the electromagnetic steel plate 91 laminated | stacked on the circumferential direction. Even if it is such an aspect, the part which consists of the core part 7 and the salient pole 8, and a magnetic receiving part can each be formed by laminating | stacking an electromagnetic steel plate.

  Next, a second reference example related to the present invention will be described below.

  The motor M2 according to the present reference example has a stator 1 and a perspective view as shown in FIG. 7, a front view as shown in FIG. 8, and a schematic view taken along the line xx in FIG. A rotor 2 disposed inside the stator 1 and a rotary shaft 3 attached through the center of the rotor 2 are provided. In FIG. 7, in order to clearly illustrate the configurations of the stator 1 and the rotor 2, a bearing portion that rotatably supports the rotating shaft 3, an external connection portion of the coil 5 that constitutes the stator 1, and the like are illustrated. Is omitted. The parts corresponding to those in the first reference example described above are given the same names and symbols.

  Hereinafter, the difference from the first reference example described above will be described. In this reference example, the axial width on the outer peripheral side of the coil 5 is larger than the axial width on the inner peripheral side of the coil 5. Specifically, when the coil 5 is wound around the stator core 6, the inner peripheral side is housed in the coil slot 6 x, and the outer peripheral side is gradually moved from one axial end to the other end. In FIG. 9, the coil 5 in the first reference example described above is indicated by imaginary lines. Also in this reference example, the inner peripheral end surface of the coil 5 is substantially flush with the inner peripheral end surface of the stator core 6.

  Other portions of the motor M2 according to this reference example have the same configuration as the motor M1 according to the first reference example described above.

  According to such a configuration of the motor M2, in addition to the effects related to the configuration of the motor M1 according to the first reference example described above, the following effects can be obtained. That is, since the axial width on the outer peripheral side of the coil 5 wound around the stator core 6 is larger than the axial width on the inner peripheral side of the coil 5, the axial width on the outer peripheral side and the inner peripheral side of the coil 5. Compared with the first reference example in which the coil 5 is wound with the coil 5 being equalized, the number of turns of the coil 5 can be maintained while the number of turns of the coil 5 on the outer peripheral side can be reduced. The outer diameter as a whole can be further reduced.

  As in the first reference example, instead of the rotor according to this reference example, the axially orthogonal cross-sectional shape as shown in FIG. 4 is the same in all parts, and the vicinity of the protruding end face of the salient pole Y8 is the magnetic receiving portion. A rotor X2 functioning as X9 or a rotor Y2 provided with a magnetic receiving portion Y9 extending in only one direction from the protruding end of the salient pole Y8 as shown in FIG. 5 may be adopted, as shown in FIG. You may form the magnetic receiving part of the rotor 2 using the electromagnetic steel plate 91 laminated | stacked on the circumferential direction.

  Further, as another modified example of the present reference example, a mode in which a stator A1 using a stator core A6 having a configuration as described below and shown in a perspective view in FIG. 10 is used instead of the stator core 6 described above is considered. It is done. As shown in FIG. 10, the stator core A6 has a side view as shown in FIG. 11 (a), and a zz sectional view in FIG. 11 (a) as shown in FIG. 10 (b). In addition, the thickness dimension is gradually reduced toward the both ends in the axial direction, and the outer peripheral width dimension is larger than the inner peripheral width dimension. A magnetic pole 61a, 61b having a coil slot A6x on the inner peripheral side of the central portion in the direction and arranged in parallel in the extending direction of the rotation axis, and a connecting portion 62 that magnetically connects the magnetic poles 61a, 61b And a flange A63 formed by extending the inner ends of the magnetic poles 61a and 61b of the stator core main body A60 in the circumferential direction with the coil slot 6x interposed therebetween. With such a configuration, the height of the stator core A6 can be further reduced, and the outer diameter of the stator A1 can be reduced. In addition, the inner end portions of the magnetic poles 61a and 61b are arranged in the circumferential direction while saving material by cutting out both axial end portions on the outer peripheral end side of the stator core body A60, which is a portion not directly related to the formation of the magnetic path. By forming the flange A63 by extending, it is possible to reduce the size of the other portion while securing the area of the portion facing the rotor 2 by the flange A63, and thus further reduction in size and weight of the stator core A6 can be achieved. The flange A63 may be extended in the axial direction from the inner peripheral end of the stator A1.

  Next, an embodiment of the present invention will be described below.

  As shown in the perspective view of FIG. 12, the motor M3 according to the present embodiment includes a stator 1, a rotor 2 disposed inside the stator 1, and a rotary shaft 3 that is attached through the center of the rotor 2. It has. In FIG. 12, in order to clearly illustrate the configurations of the stator 1 and the rotor 2, a bearing portion that rotatably supports the rotating shaft 3, an external connection portion of the coil 5 that constitutes the stator 1, and the like are illustrated. Is omitted, and the coil 5 is shown in a block shape. The parts corresponding to those in the first reference example described above are given the same names and symbols.

  Hereinafter, the difference from the first reference example described above will be described. The stator 1 according to this embodiment includes a stator core 6 having the following shape as shown in a perspective view in FIG. 13 and a side view in FIG. Have. The stator core 6 is a dust core formed by compressing, for example, magnetic powder, and includes a pair of magnetic poles 61a and 61b arranged in parallel in the extending direction of the rotation axis, and the magnetic poles 61a and 61b. A stator core body 60 having a connecting portion 62 that connects magnetically, and a flange 63 formed by extending the inner ends of the magnetic poles 61a and 61b of the stator core 6 in the circumferential direction and extending toward the center in the longitudinal direction. It comprises. The stator core body 60 has outer inclined surfaces 6a at both axial ends on the outer peripheral side, and has an inner inclined surface 6b substantially parallel to the outer inclined surface 6a on the inner peripheral side. Further, the stator core body 60 is provided with a coil slot 6x which is a recess capable of accommodating the coil 5 on the inner peripheral side of the axially central portion. The stator core 6 is formed by winding the coil 5 between the outer inclined surface 6a and the inner inclined surface 6b. In the present embodiment, a total of 12 stator cores 6 are provided at intervals of 30 degrees.

  Other parts of the motor M3 according to the present embodiment have the same configuration as the motor according to the first reference example described above.

  According to such a configuration of the motor M3, the following effects can be obtained in addition to the effects related to the configuration of the motor M1 according to the first reference example described above. That is, it has outer inclined surfaces 6a at both axial ends on the outer peripheral side of the stator core 6, and has an inner inclined surface 6b substantially parallel to the outer inclined surface on the inner peripheral side of the stator core 6. Since it is wound between the outer inclined surface 6a and the inner inclined surface 6b, the magnetic flux passes between the outer inclined surface 6a and the inner inclined surface 6b of the stator core 6, so that the magnetic path can be shortened, and the stator 1 Can be further reduced in weight. Furthermore, since the coil 5 is housed inside the outer end of the stator core 6, the stator 1 can be further reduced in size. The coil 5 is wound around the stator core 6 a maximum number of times within a range that can be accommodated in the depth direction both ends 6d and the outer end 6c of the stator core 6, so that the output of the motor M3 is secured while the stator 1 is downsized. it can.

  Note that the stator core 6 according to the present embodiment may be formed using a magnetic steel sheet 6p laminated in the circumferential direction as shown in FIG. 15 instead of the dust core.

  Further, instead of the stator core 6 according to the present embodiment, a stator core 60 provided with an outer inclined surface 60a and an inner inclined surface 60b only at one end portion in the axial direction as shown in FIG. 16 may be adopted.

  The present invention is not limited to the embodiment described above.

Further, as a third reference example related to the present invention, a rotor that employs a rotor 20 as described below in place of the rotor 2 according to the above-described embodiment can be cited .

  The rotor 20 has a core portion formed by inserting the rotating shaft 3 into the center portion thereof as shown in a perspective view in FIG. 17 and a longitudinal sectional view in a state combined with the stator according to the embodiment described above in FIG. 207, a salient pole 208 projecting in a radial direction perpendicular to the axis of the rotating shaft 3 from the core 207, and a magnetic receiving portion 209 extending along the rotating shaft 3 from the projecting end of the salient pole 208 The thickness of the magnetic receiving portion 209 is gradually decreased toward both end portions in the axial direction. In the rotor Y2 provided with the magnetic receiving portion Y9 extending in only one direction from the protruding end of the salient pole Y8 as shown in FIG. 5, the thickness dimension of the magnetic receiving portion Y9 is gradually increased as the distance from the salient pole increases. It may be small.

  If such a rotor 20 is employed, a minimum thickness capable of forming a magnetic path is secured at both axial end portions of the magnetic receiving portion 209, and the thickness dimension of the central portion in the axial direction has a bonding strength with the salient pole 208. By making it large enough to secure, it is possible to reduce the weight of the rotor 20 while maintaining the output of the motor and ensuring the rigidity of the rotor 20.

  And as described below, and as shown in a longitudinal sectional view in FIG. 19, the magnetic receiving portion 209 of the rotor 20 is extended to the inner peripheral side at least at one end portion in the axial direction, and an extension portion 2091 is provided. A configuration in which the stator core 6 is extended to the inner peripheral side and an extension core 64 facing the extension portion 2091 of the rotor 20 may be employed. That is, an extension portion 2091 that extends from at least one axial end of the magnetic receiving portion 209 of the rotor to the inner peripheral side, and an extension that extends the stator core 6 to the inner peripheral side and faces the extension portion 2091. An extended magnetic path forming unit including the core 64 may be provided.

  By adopting such a configuration, a magnetic attractive force can be applied also to the extended magnetic path forming portion, that is, between the extended portion 2091 and the extended core 64, so that the output of the motor M is improved. Can be made.

Note that FIG. 19 shows a mode using the stator 1 according to the above-described embodiment and the rotor 20 according to the above-described embodiment according to FIGS. 17 and 18, but of course, the stator 1 according to the above-described embodiment. but it may also be provided an extended core on the stator core 6 of the stator 1 according to the first or second reference example described above in place of. Furthermore, what provided the extension part in the rotor 2 which concerns on embodiment mentioned above as other embodiment of this invention is also mentioned . And of course, you may provide an extension part and an extension core in the axial direction both ends of a stator and a rotor, respectively.

  Furthermore, as shown in FIG. 20, the magnetic receiving portion X209 is provided extending from the protruding end of the salient pole X208 of the rotor X20 only in one direction, and the magnetic receiving portion X209 of the stator core 6 is extended. Even if the extension core 64 is provided to extend to the inner peripheral side at the end opposite to the side, the same effect can be obtained.

  In addition, various changes may be made without departing from the spirit of the present invention.

The perspective view which shows the motor which concerns on the 1st reference example relevant to this invention. The front view which shows the motor which concerns on the same reference example. The figure which shows the xx cross section in FIG. 2 typically. The perspective view which shows the rotor which concerns on the modification of the reference example. The perspective view which shows the rotor which concerns on the modification of the reference example. The perspective view which shows the magnetic receiving part which concerns on the modification of the reference example. The perspective view which shows the motor which concerns on the 2nd reference example relevant to this invention. The front view which shows the motor which concerns on the same reference example. The figure which shows the yy cross section in FIG. 5 typically. The perspective view which shows the stator which concerns on the modification of the reference example. The figure which shows the stator core which concerns on the modification of the reference example. The perspective view which shows the motor which concerns on one Embodiment of this invention. The perspective view which shows the stator which concerns on the same embodiment. The side view which shows the stator which concerns on the same embodiment. The figure which shows the stator core which concerns on the modification of the same embodiment. The figure which shows the stator core which concerns on the modification of the same embodiment. The perspective view which shows the rotor of the motor which concerns on the 3rd reference example relevant to this invention. The longitudinal cross-sectional view which shows the motor which concerns on the modification of the reference example . The longitudinal cross-sectional view which shows the motor which concerns on the modification of the reference example . The longitudinal cross-sectional view which shows the motor which concerns on the modification of the reference example .

M3 ... Motor 1 ... Stator 2, 20 ... Rotor 5 ... Coil 6 ... Stator core 8, 208 ... Salient pole 9, 209 ... Magnetic receiving part

Claims (2)

A rotor having a salient pole projecting in a radial direction perpendicular to the rotational axis and having a magnetic receiving portion at the projecting end of the salient pole, and housing the rotor inside, parallel to the extending direction of the rotational axis A stator core having a pair of magnetic poles and a connecting portion that magnetically connects these magnetic poles and capable of forming a magnetic path with the magnetic receiving portion, and the magnetic poles of the stator core have different polarities. A motor comprising a stator having a plurality of coils to be excited in the circumferential direction,
The stator core has an outer inclined surface at least at one end in the axial direction on the outer peripheral side, and has an inner inclined surface substantially parallel to the outer inclined surface on the inner peripheral side of the stator core, and the coil is connected to the outer inclined surface and the A motor that is wound around an inner inclined surface. A salient pole protruding in the radial direction perpendicular to the rotation axis and having a magnetic receiving portion at the protruding end of the salient pole is used together with the rotor housed therein. The stator core which has a pair of magnetic poles arranged in parallel with each other in the extending direction and a connecting portion for magnetically connecting these magnetic poles and can form a magnetic path with the magnetic receiving portion, and the magnetic poles of the stator core are different. A stator having a plurality of coils that are excited so as to be polar in the circumferential direction,
The stator core has an outer inclined surface at least at one end in the axial direction on the outer peripheral side, and has an inner inclined surface substantially parallel to the outer inclined surface on the inner peripheral side of the stator core, and the coil is connected to the outer inclined surface and the A stator that is wound around an inner inclined surface.

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