JP2010141954A - Motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a new structure that miniaturizes a motor by rapidly thinning a stator without marring its output property, in a motor of such structure that salient poles are formed in both the stator and a rotor inside it. <P>SOLUTION: The stator 2 is made of, for example, two pieces of stator parts 21 and 22 in its axial direction, and a rotor 3 is made of, for example, two pieces of rotor parts 31 and 32, in its axial direction. A coil 8 is wound so that each salient pole 6 at the inner perimetrical face of one stator part 21 may be excited into an N magnetic pole, and a coil 8 is wound so that each salient pole 6 in the other stator part 22 may be excited into an S magnetic pole. Both stator parts 31 and 32 are coupled with each other, being slid in its circumferential direction so that the salient pole 6 of other phase may be positioned between the salient poles 6 of the same phases when viewed from its axial direction, and both rotor parts 31 and 32 are coupled with each other, being slid in its circumferential direction, according to the slippage of both stator parts 21 and 22. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a motor having a structure in which salient poles are formed on both a stator and a rotor inside the stator, and more particularly, to miniaturization thereof.

  Conventionally, a drive motor or the like of an electric vehicle is often formed in a structure in which a rotor is provided inside a stator, a permanent magnet is provided on the rotor, and a plurality of coils are wound around the stator. Then, the rotor rotates based on the relationship between the magnetic poles generated by sequentially energizing each coil of the stator and the magnetic poles of the permanent magnets of the rotor (see, for example, Patent Document 1).

  However, it is not easy to reduce the cost in the structure in which the permanent magnet is provided on the rotor as described above.

In recent years, various motors in which a permanent magnet is not provided in a rotor such as a switched reluctance motor have been proposed. In these motors, a stator and a rotor inside the stator are formed of a soft magnetic material (silicon steel plate or the like), a plurality of radially inward salient pole pairs are arranged in the circumferential direction on the inner peripheral surface of the stator, and In addition, a plurality of radially outward salient poles are arranged in the circumferential direction on the circumferential surface of the rotor, and each phase coil is wound around each of the salient poles of the stator in a concentrated manner. Since it is not provided, the cost is low, and the magnetic flux is concentrated on the magnetic pole portion of the salient pole by the concentrated coil, so that the size can be reduced.
JP 2008-22593 A

  The conventionally proposed motor having a structure in which salient poles are formed in both the stator and the inner rotor of the switched reluctance motor or the like has a magnetic path that returns from the stator to the stator through the rotor only on the plane of the axial section. In order to form, especially a stator needs to be formed in considerable thickness, and there exists a problem which cannot respond to the request of making a stator thinner by making a stator thin. When the stator is thickened, the inner diameter of the stator is reduced accordingly, the generated torque is reduced, and the output characteristics of the motor are impaired.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a novel structure in which a stator can be remarkably thinned and miniaturized without impairing output characteristics in a motor having a structure in which salient poles are formed on both a stator and a rotor inside the stator. And

  In order to achieve the above-described object, the motor of the present invention has a plurality of radially inwardly projecting poles arranged circumferentially on the inner peripheral surface of a soft magnetic stator and coaxially arranged inside the stator. A motor having a structure in which a plurality of radially outward salient poles are arranged in a circumferential direction on the outer peripheral surface of a provided soft magnetic rotor, and coils of each phase are sequentially concentrated around each salient pole of the stator. The stator is formed by a plurality of axial stator portions, the rotor is formed by a plurality of axial rotor portions, and each salient pole on the inner peripheral surface of one of the stator portions is an N magnetic pole. The coil is wound so that it is excited, and the coil is wound so that each salient pole of the other stator part is excited by the S magnetic pole, and the one stator part and the other stator part are in the axial direction. The salient poles of the other phases are located between the salient poles of the same phase Coupled shifted circumferentially so that the rotors unit is characterized by being connected by shifting in the circumferential direction in accordance with the deviation of the two stators portion (claim 1).

  In the case of the motor according to the first aspect of the present invention, (1) the stator is formed by connecting two stator portions in the axial direction of the motor, and the rotor is also connected by connecting two stator portions in the axial direction of the motor. Since it is formed, the motor has a so-called tandem structure. In addition, the salient pole of one stator portion is excited to the N magnetic pole, and the salient pole of the other stator portion is excited to the S magnetic pole. When the motor is viewed from the axial direction, the number of salient poles (the number of magnetic poles) of the stator is equivalently increased, and the magnetic flux crossing the stator in the circumferential direction is reduced accordingly. That is, the magnetic path from the N magnetic pole (saliency pole) of the excitation phase of one stator through the rotor to the S magnetic pole (saliency pole) of the same excitation phase of the other stator is the axial length of the stator portion and the rotor portion. Is twice as large as the case where the number of each is one, so that the cross-sectional area is almost doubled in the circumferential direction. Further, since not only the salient pole part of the excitation phase of both stator parts but also the yoke part of the other non-excitation phase adjacent to each other can be used as a magnetic path, the axial direction is approximately tripled. For this reason, the range in which the yoke portions that serve as the magnetic paths of both stator portions can be used extends in the axial direction and the circumferential direction, and the thickness of both stator yoke portions can be reduced accordingly. If the thickness of both stator yoke portions is reduced, the outer diameter of the stator can be reduced to reduce the size of the motor, and the generated torque can be increased by increasing the inner diameter of the stator, thereby improving the output characteristics of the motor. Can be improved. (2) The two stator portions are connected by shifting the salient pole arrangement in the circumferential direction so that salient poles of other phases exist between salient poles of the same phase when viewed from the axial direction. Since there are non-excited salient poles of the other phases between the N-phase salient poles and the S-pole salient poles of the excitation phase, leakage magnetic flux between the salient poles of the excitation phase is also suppressed. As a result, the inductance that causes the rise of the current during high-speed rotation to be reduced can be reduced, and the output characteristics can be improved.

  Therefore, according to the first aspect of the present invention, in a motor having a structure in which salient poles are formed on both the stator and the rotor inside the stator, the thickness of the stator can be reduced and the size can be reduced without impairing the output characteristics. .

  Next, in order to describe the present invention in more detail, embodiments will be described in detail with reference to FIGS. In these drawings, the motor shaft and the like are omitted.

(First embodiment)
A first embodiment will be described with reference to FIGS.

  FIG. 1 is a perspective view showing a schematic configuration of a motor 1 of the present embodiment. 2 shows a cross section of the two units 11 and 12 connected in the axial direction of FIG. 1 (the direction of the motor shaft α) as viewed from the left side of the drawing, (a) is a cross section of the unit 11, and (b) is a unit. 12 is a cross section of twelve.

  3 is a perspective view of the stator 2 formed by the stator portions 21 and 22 of the units 11 and 12, FIG. 4 is a perspective view of the rotor 3 formed by the rotor portions 31 and 32 of the units 11 and 12, and FIGS. 3 is an explanatory diagram of a magnetic path of the motor 1. FIG.

  As shown in FIG. 1, the motor 1 of this embodiment is formed in a tandem structure in which two units 11 and 12 are connected in the axial direction.

  The units 11 and 12 have the same element configuration in which the rotor parts 31 and 32 shown in FIG. 4 are coaxially provided inside the cylindrical stator parts 21 and 22 shown in FIG. 3, and the stator parts 21 and 22 are shown in FIG. A stator 2 of the motor 1 is formed by being connected via an annular connecting yoke 4 shown. The rotor portions 31 and 32 are also connected through the same connecting yoke 5 shown in FIG. 4 to form the rotor 3 of the motor 1. In addition, the stator parts 21 and 22, the rotor parts 31 and 32, and the connection yokes 4 and 5 are formed, for example by the laminated steel plate which laminated | stacked the silicon steel plate etc. which are soft magnetic bodies on the axial direction, and the dust core. Further, the connection yokes 4 and 5 are interposed in the connection of the stator portions 21 and 22 and the connection of the rotor portions 31 and 32 because the thickness of the coil 8 wound around each salient pole 6 described later of the stator portions 21 and 22. Etc. are taken into consideration.

  Next, in the present embodiment, the motor 1 has a structure in which salient poles are formed on both the stator 2 and the rotor 3, and U, V, W three-phase driving is performed. Each of the twelve salient poles 6 inward in the radial direction is integrally formed on the inner peripheral surface and arranged at equal intervals of 30 degrees in the circumferential direction. Each of the four salient poles 6 at symmetrical positions 90 degrees apart forms three sets of salient poles (magnetic poles) in the order of U, V, and W counterclockwise. The rotor portions 31 and 32 are each formed with eight radially outward salient poles 7 integrally formed on the outer peripheral surface and arranged at equal intervals of 45 degrees in the circumferential direction. Note that the number of salient poles 7 of the rotor parts 31 and 32 is smaller than that of the salient poles 6 of the stator parts 21 and 22 as in the known switched reluctance motor. This is to shift the positional relationship between the salient poles 31 and 32 and the salient poles 7 and rotate the rotor parts 31 and 32 by exciting the salient poles 6 of the stator parts 21 and 22.

  Furthermore, as shown in FIGS. 2A and 2B, the salient poles 6 of the stator portions 21 and 22 are each concentratedly wound in order with coils 8 of U, V, and W phases. The coils 8 of the salient poles 6 of the stator portions 21 and 22 excite all the salient poles 6 of the stator portion 21 to N magnetic poles, and excite all the salient poles 6 of the stator portion 22 to S magnetic poles. The coil 8 of each salient pole 6 of the stator portion 22 is reversely wound with respect to the coil 8 of each salient pole 6 of 21. Note that U +, V +, and W + in FIG. 2A indicate N magnetic pole excitation, and U−, V−, and W− in FIG. 2B indicate S magnetic pole excitation.

  Next, when the stator portion 21 is one stator portion of the present invention and the stator portion 22 is the other stator portion of the present invention, the one stator portion 21 and the other stator portion 22 are the same when viewed from the axial direction. The phase salient poles 6 are connected so as to be shifted in the circumferential direction so that the salient poles 6 of the other phases are located between the salient poles 6 of the phase. The rotor portions 31 and 32 are also connected by shifting the position of the salient pole 7 by the same amount in the circumferential direction in accordance with the displacement of both the stator portions 21 and 22. The amount of shift is, for example, m / 2 pitch (m is the number of phases of the motor 1), where the arrangement interval of the salient poles 6 is 1. In the case of this embodiment where m = 3, the stator portions 21 and 22 are 1 are connected to each other by shifting by 45 degrees (= 30 × 3/2) indicated by an arrow line a in FIG. 1 and an arrow line b in FIG. 2B, and the rotor portions 31 and 32 are also illustrated in the circumferential direction. They are connected with a shift of 45 degrees as indicated by the arrow b in FIG.

  2A and 2B, “6u” is assigned to the specific salient pole 6 of the U phase of the stator portions 21 and 22 so that the amount of shifting becomes clear. “7x” is assigned to the salient poles 7 corresponding to 31 and 32. In the case of the present embodiment, since the salient poles 7 of the rotor portions 31 and 32 are at an interval of 45 degrees, as apparent from the comparison between FIGS. 2 (a) and 2 (b), the rotor portions 31 and 32 are Even if they are connected by being shifted by 45 degrees (= 30 × 3/2), the arrangement of the salient poles 7 is the same in the rotor part 31 and the rotor part 32, but depending on the number of the salient poles 7 and the like, the rotor part 31 and the arrangement of the salient poles 7 of the rotor part 32 are shifted like salient poles 6 and 6u.

  Then, when the coils 8 of the salient poles 6 of each phase pair of the stator portions 21 and 22 are energized in phase order, the salient poles 6 of the same phase pair of the stator portions 21 and 22 are N of the stator portion 21. The magnetic pole and stator portion 22 are excited to the S magnetic pole. Further, the magnetic forces of the N magnetic pole of the stator portion 21 and the S magnetic pole of the stator portion 22 are applied to the salient poles 7 of the rotor portions 31 and 32 in the vicinity thereof. The rotor 3 is rotated by repeating the phase sequence of these operations.

  In this case, the stator 2 of the motor 1 is formed by connecting the two stator portions 21 and 22 in the axial direction of the motor 1, and the rotor 3 also connects the two stator portions 21 and 22 in the axial direction of the motor 1. Therefore, the motor 1 has a so-called tandem structure. Further, since all the salient poles 6 of the stator portion 21 are excited to the N magnetic pole and all the salient poles 6 of the stator portion 22 are excited to the S magnetic pole, the stator portion 21 is indicated by the broken line arrow in FIG. The magnetic path from the N magnetic pole (saliency pole 6) of the excitation phase through the rotor parts 31 and 32 (not shown in FIG. 5) to the S magnetic pole (saliency pole 6) of the same excitation phase of the stator part 22 is a known switch. As in the case of a reluctance motor, for example, in the case of a motor formed by the unit 11 by exciting one end side of the salient pole 6 of each phase of the stator portion 21 with an N magnetic pole and the other end with an S magnetic pole. In comparison, the cross-sectional area in the circumferential direction extends approximately twice or more. Further, as shown by solid line arrows c0, c1, and c2 in FIG. 6, not only the salient pole part of the excitation phase of the stator portions 21 and 22 (solid line arrow c0) but also the yoke part of the other non-excitation phase adjacent to both sides (solid line). Since the arrows c1 and c2) can also be used as magnetic paths, the sectional area in the axial direction is almost tripled. Note that (u +), (v +), and (w +) in FIG. 6 indicate the U, V, and W phases of the N magnetic pole.

  Therefore, the range in which the yoke portion that becomes the magnetic path of the stator portions 21 and 22 can be used extends in the axial direction and the circumferential direction, and accordingly, the thickness of the yoke portions of both the stator portions 21 and 22 can be reduced. When the thickness of the yoke portions of both the stator portions 21 and 22 is reduced, the outer diameter of the stator 2 is reduced and the motor 11 can be reduced in size, and the torque generated by increasing the inner diameter of the stator 2 is increased. The output characteristics of the motor 1 can be improved.

  Further, when the stator parts 21 and 22 are viewed from the axial direction, as shown in FIG. 7, the salient poles 6 of the stator part 21 and the salient poles 6 of the stator part 22 are alternately shifted and overlapped, and the number of salient poles is doubled. Increased state. At this time, there are other non-excited two-phase salient poles 6 surrounded by a solid circle in FIG. 7 between the magnetized salient poles 6 of the N magnetic poles and the S poles of the S magnetic poles. The magnetic flux such as the broken line d in FIG. 7 that crosses 2 in the circumferential direction decreases, and the leakage magnetic flux between the magnetic poles (the salient poles 6) of the excitation phase such as the broken line e in FIG. It is suppressed. As a result, the inductance that causes the current fall during high-speed rotation to be impaired can be reduced, and the output characteristics can be improved. 7, (u +), (v +), and (w +) are the U, V, and W phases of the N magnetic pole of the stator portion 21, and (u−), (v−), and (w−) are the stator portions. The respective phases of U, V, and W of 22 S magnetic poles are shown.

  Therefore, the motor 1 having a structure in which the salient poles 6 and 7 are formed on both the stator 2 and the rotor 3 inside thereof can be reduced in size by reducing the thickness of the stator 2 without impairing its output characteristics.

(Second Embodiment)
A second embodiment will be described with reference to FIGS. FIG. 8 is a cross-sectional view of the rotor 31 of the present embodiment of the motor 1 viewed from the axial direction, and FIG. 9 is a cross-sectional view of a portion of the stator 21 of the present embodiment viewed from the axial direction.

  This embodiment is different from the first embodiment in that at least the rotor portions 31 and 32 of the motor 1 are formed of laminated steel plates whose lamination direction is orthogonal to the axial direction, and the rotor portions 31 and 32 formed of laminated steel plates. 8, a slit-like opening 9a is formed on the inner peripheral surface side (rotating shaft side) of the yoke portion where each projection 7 is formed, and the stacking direction is axial in the opening 9a. Are laminated steel plates or magnetic cores 10a of powdered iron cores.

  In this case, the rotor parts 31 and 32 pass a magnetic flux well in the circumferential direction parallel to the laminating direction of the laminated steel sheets, but the magnetic resistance is large in the rotation axis direction orthogonal to the laminating direction of the laminated steel sheets, and the magnetic flux However, if the magnetic core 10a is inserted, the magnetic flux may be reduced by the laminated steel plate or the dust core parallel to the axial direction when the magnetic core 10a is inserted. The resistance is reduced, the magnetic flux in the axial direction is improved, and a sufficient magnetic path of the arrow lines c0 to c1 can be secured.

  Note that the opening 9a is open to the inner peripheral side of the rotor parts 31 and 32, so that the opening part 9a in which the magnetic core 10a is inserted into the rotor parts 31 and 32 is closed. This is because an eddy current is generated when embedded.

  As is clear from FIG. 8, the opening 9 a is preferably formed on the inner peripheral side from half the height La of the protrusion 7. This is because if the opening 9a is formed further to the outer peripheral side and the magnetic core 10a is inserted, the stator portions 21 and 22 may not sufficiently spread the magnetic flux.

  Further, when the stator portions 21 and 22 are also formed of laminated steel plates whose lamination direction is orthogonal to the axial direction, each projection 6 is formed as shown in a part of the cut surface of the stator portion 21 in FIG. A slit-shaped opening 9b may be formed on the outer peripheral surface side of the yoke portion, and a laminated steel plate or a magnetic core 10b of a dust core may be inserted into the opening 9b. At this time, the opening 9b is preferably formed on the outer peripheral surface side from the position of the half height Lb / 2 of the salient pole 6 so that the magnetic flux spreads sufficiently.

  As described above, in the present embodiment, (1) when at least the rotor portions 31 and 32 of the motor 1 are formed of laminated steel plates whose lamination direction is orthogonal to the axial direction, the laminated steel plates whose lamination direction is parallel to the axial direction. Alternatively, by incorporating the magnetic core 10a of the dust core into the rotor portions 31 and 32, the magnetic core 10a improves the poor magnetic flux caused by the laminated steel plates of the rotor portions 31 and 32, and the output efficiency of the motor 1 is improved. Can be prevented. In addition, the same effect is acquired also about the stator parts 21 and 22 by incorporating in the stator parts 21 and 22 the magnetic core 10b of the laminated steel plate or dust core whose lamination direction is parallel to an axial direction. (2) The opening 9a in which the magnetic core 10a is inserted is formed on the inner peripheral side from the half La / 2 of the height La of the protrusion 7, and the opening 9b in which the magnetic core 10b is inserted is formed in the protrusion 6 Since it is formed on the outer peripheral side from half Lb / 2 of the height Lb, the spread of the magnetic path in the stator portions 21 and 22 in the circumferential direction is not hindered. (3) Since the openings 9a and 9b are provided open to the inner peripheral side of the rotor portions 31 and 32 and the outer peripheral side of the stator portions 21 and 22, it is possible to prevent the generation of eddy currents and prevent a decrease in efficiency. it can.

  Therefore, it is possible to prevent the output efficiency of the motor 1 from being lowered due to a decrease in magnetic flux when the rotor portions 31 and 32 and the stator portions 21 and 22 are formed of laminated steel plates.

(Third embodiment)
A third embodiment will be described with reference to FIG. FIG. 10 is a plan view of a part of the stator portions 21 and 22.

  In the present embodiment, the terminal structure of the motor 1 of FIG. 1 and the winding method of the coil 8 of the stator portions 21 and 22 are improved.

  In the motor 1, two terminals (a winding start terminal and a winding end terminal) of the coil 8 wound around the salient pole 6 are drawn out from the stator portions 21 and 22 for three phases (a total of six terminals). Then, if all the terminals (total 12 terminals) of each phase of both stator parts 21 and 22 are gathered and pulled out to the stator part 21, for example, the number of terminals is large (12 terminals), and a large wiring component (bus ring) Etc.) is required. In addition, the enamel wire and the like are also routed longer. Therefore, the motor 1 is increased in size.

  Further, in order to further reduce the size of the motor 1, it is desirable that the coils 8 of the salient poles 6 and 7 are wound without loosening, and it is also desired to ensure insulation at the transition portion between the coils 8 and to reduce the size.

  Therefore, in the present embodiment, (1) as shown in FIG. 10, terminals 81 such as enamel wires of the coil 8 wound around the salient poles 6 of the respective phases of the stator portions 21 and 22 of the motor 1 are respectively provided. It distributes and arranges on the outside in the axial direction. By doing in this way, it was wound by the salient pole 6 of each phase of the other stator part 22, compared with the case where all the terminals 81 are arranged outside the axial direction of one stator part 21, for example. The enameled wire or the like of the coil 8 does not have to be pulled out to the stator portion 21 side, and the length of the enameled wire is shortened, the space for handling is reduced, and the connecting parts are further downsized. In addition, there are fewer insulating materials (insulating sleeves, guides, etc.) for routing enameled wires and the like. Therefore, the motor 1 can be further miniaturized.

  Moreover, in this embodiment, at least any one of the following (2)-(4) is implemented.

  (2) The coil of the salient pole 6 excited in the same phase of the stator portion 21 and the stator portion 22 delivers one enameled wire or the like from the stator portion 21 to the stator portion 22 or vice versa without cutting halfway. And wound around the salient poles 6 of both portions 21 and 22. If it does in this way, a connection member required when connecting the enameled wire etc. which were wound around salient pole 6 of stator part 21, and the enameled wire etc. which were wound on salient pole 6 of stator part 22 can be omitted, for example.

  (3) When the coil of the salient pole 6 excited in the same phase of the stator portion 21 and the stator portion 22 is formed by a single enameled wire or the like, the stator portion 21 side should be the winding start side and the stator portion 22 side should be the winding end side. For example, the winding direction of the coil 8 on the winding start side (stator portion 21 side) and the coil 8 on the winding end side (stator portion 22 side) are as shown in FIG. And the winding start portion of the coil 8 on the winding start side and the winding end portion of the coil 8 on the winding start side so that the winding start portion of the coil 8 on the winding end side is an end surface portion facing the inside of the motor 1 of each coil 8. The winding start portion of the coil 8 is set as indicated by the arrow lines 8s and 8e in the drawing. In this way, the coil 8 on the winding start side and the coil 8 on the winding end side are wound in a tensioned state, and both the coils 8 are wound without being broken by looseness.

  (4) A crossover guide portion 11 for insulating and protecting an enameled wire or the like is provided at the crossover portion from the coil 8 of the stator portion 21 to the coil 8 of the stator portion 22, and the crossover guide portion 11 is connected to both the stator portions 21 and 22. The coil 8 is fixed to the bobbin or the like. By doing in this way, the insulation of a transition part can be ensured, and the coil 8 of the stator part 21 and the coil 8 of the stator part 22 are wound by separate enamel wires etc., and are connected by the transition part. Even in such a case, the collapse due to the looseness of the coil 8 can be prevented.

  Furthermore, when the above (4) is performed, the following (5) is also performed as necessary.

  (5) The connecting wire guide portion 11 is preferably arranged to be inclined obliquely as shown in FIG. 10 so as to form a linear shortest connecting portion between the coil 8 of the stator portion 21 and the coil 8 of the stator portion 22. . If it does in this way, interference with the crossover guide part 11 of another phase will not arise.

  Therefore, in the case of this embodiment, the terminal structure of the motor 1 and the winding method of the coils 8 of the stator portions 21 and 22 can be improved, and further miniaturization and improvement of insulation can be achieved.

  The present invention is not limited to the above-described embodiments, and various modifications other than those described above can be made without departing from the spirit thereof. For example, the motor 1 has four or more phases. Of course, it may be a multi-phase driven configuration. Further, the number of salient poles 6 of the stator portions 21 and 22 and the number of salient poles 7 of the rotor portions 31 and 32 are not limited to those of the above embodiment. Furthermore, the amount of shift in the connection between the stator portions 21 and 22 is not limited to m / 2 pitch. Further, the number of rotor portions and stator portions may not be two in the axial direction but may be three or more.

  The present invention can be applied to various motors having a structure in which salient poles are formed on both the stator and the inner rotor, and the use of the motor is not limited to a drive motor of an electric vehicle.

It is a see-through | perspective perspective view which abbreviate | omitted a part of motor of the 1st Embodiment of this invention. FIG. 2 shows a cross section perpendicular to the axial direction of the motor of FIG. 1, (a) is a cross-sectional view on one unit side, and (b) is a cross-sectional view on the other unit side. It is a perspective view of the stator part of FIG. It is a perspective view of the rotor part of FIG. It is explanatory drawing of the magnetic path of the motor of FIG. It is explanatory drawing of the magnetic path of the stator part of the motor of FIG. It is explanatory drawing, such as a leakage magnetic flux of the motor of FIG. It is sectional drawing of the rotor part of 2nd Embodiment. FIG. 6 is a partial cross-sectional view of a stator portion of a second embodiment. It is a top view of the principal part of 3rd Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Motor 2 Stator 3 Rotor 6, 7 Salient pole 8 Coil 21, 22 Stator part 31, 32 Rotor part

Claims (1)

A plurality of radially inward salient poles are arranged in the circumferential direction on the inner peripheral surface of the soft magnetic stator,
A plurality of radially outward salient poles are disposed in the circumferential direction on the outer peripheral surface of a soft magnetic rotor provided coaxially inside the stator,
A motor having a structure in which coils of each phase are concentrated and wound in order on each salient pole of the stator,
The stator is formed of a plurality of axial stator portions,
The rotor is formed by a plurality of axial rotor portions,
A coil is wound so that each salient pole on the inner peripheral surface of one stator portion is excited by the N magnetic pole,
A coil is wound so that each salient pole of the other stator portion is excited by an S magnetic pole,
The one stator part and the other stator part are connected to each other in a circumferential direction so that salient poles of the other phase are located between salient poles of the same phase when viewed from the axial direction,
The both rotor portions are connected to each other by shifting in the circumferential direction in accordance with the shift between the both stator portions.

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