JP2016144275A - Rotary electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize a high performance and a high torque of a rotary electric machine with a high reliability method.SOLUTION: A stator comprises: a coil to which a single-phase coil 4 in which a winding axis is formed in parallel with a rotational axis is arranged coaxially with a rotational center of the rotational axis; a tooth part that is arranged to an air gap side of the coil and projects along a rotational axis 8; and a claw pole part 1 that is arranged in a radial state with the rotational axis as a center. The claw pole part constructs a peripheral claw pole part magnetically connected to a peripheral yoke of a yoke housing the coil; and an inner center claw pole part that is arranged so as to be adjacent to the peripheral claw pole part and is magnetically connected to the inner center yoke. The inner center claw pole part and the peripheral claw pole part are magnetically connected in an opposite side of the air gap, and the tooth part formed in the claw pole part constructs a plurality of teeth projecting in a concentric and circular manner in a rotational axis direction.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a rotating electric machine used as a small electric motor, a generator or the like.

  Small-to-medium-sized motors and generators that are about 1 kW or less in output are strongly required to be lighter, thinner, and smaller from the market. Recently, as a countermeasure against global warming, electric motors are required to save energy and improve efficiency. Furthermore, as for generators, demand for small-scale household generators using natural energy instead of nuclear energy is increasing. There is also a strong demand for both motors and generators to be inexpensive.

  Thus, in order to reduce the manufacturing cost and realize that it is inexpensive, it is required that the structure and winding of the rotating electrical machine itself be simplified. In addition, rotating electric machines are roughly classified into radial gap type rotating electric machines in which the air gap between the stator and the rotor is arranged in the axial direction and axial gap type rotating electric machines in which the air gap is arranged in the radial direction. Is widely used as a general-purpose machine because the air gap can be reduced and the air gap facing area of the stator and rotor can be easily increased in the axial direction.

  Various means are known for realizing high torque in such a conventional rotating electric machine. As means for increasing the opposing areas of the winding and the air gap in order to achieve high torque, the following means are provided. There are means described in the literature. However, even with such a radial air gap type rotating electrical machine, higher torque and higher efficiency are demanded as described above.

JP 2011-217454 A JP 2013-1150543 A

2004 IEEJ Industrial Application Conference “Super-concentrated 2-phase HB stepping motor” Masafumi Sakamoto

  Brushless DC motor (hereinafter referred to as BLDC motor) or a synchronous generator using a permanent magnet as a rotor in a conventional general radial gap type rotating electric machine, or a switch having a magnetic tooth without using a permanent magnet as a rotor In the case of a reluctance motor (hereinafter referred to as an SR motor), it is known that a stator core is laminated by a silicon steel plate. In addition, when emphasizing the suppression of manufacturing cost and increasing efficiency, a concentrated winding method is adopted for the winding. The reason for this is that in the distributed winding method, due to the presence of the distributed winding coefficient, the torque decreases accordingly, and the coil end portion that does not contribute to torque generation increases, resulting in increased copper loss and reduced efficiency. . Furthermore, distributed winding has a problem that windings and wiring are more complicated than concentrated winding.

  Further, Patent Document 1 discloses a technique that employs a structure in which the opposing area of the air gap portion of the stator and the rotor is increased as a three-dimensional air gap in pursuit of higher efficiency of the radial gap type rotating electrical machine. ing. In the rotating electrical machine described in Patent Document 1, the air gap between the stator and the rotor is not planarly opposed so that the air gap expands linearly in the direction of the rotation axis. The rotating electrical machine is configured such that the unevenness provided in the circumferential direction of the facing portion is engaged. Such an air gap structure is called a three-dimensional gap. By adopting such a three-dimensional air gap, the substantial facing area of the air gap increases, so that it is possible to increase the efficiency and torque of the rotating electrical machine.

  However, since the rotary electric machine adopting this three-dimensional gap has a non-linear air gap, it cannot be assembled by separately completing the stator and the rotor and inserting the rotor into the stator in the axial direction. Therefore, considering the reduction of the iron loss of the stator core, the laminated core is made of silicon steel. However, in this three-dimensional gap method, as described in Non-Patent Document 1, the silicon steel sheet constituting the thrust direction portion of the three-dimensional gap portion is deformed by a magnetic attractive force, causing peeling or warping. As a preventive measure, welding is performed to prevent this. However, if welding is directly performed on the three-dimensional gap portion, eddy current loss occurs in the iron ingot portion. In addition, the presence of an iron ingot in the three-dimensional gap is not preferable because the risk of contact between the stator and the rotor is estimated. Therefore, as described in Non-Patent Document 1, another stator 38 having a concavo-convex portion is provided to form a double stator, and a silicon steel plate is welded at a W portion on the side opposite to the air gap of the stator 38. As described above, in the three-dimensional gap structure of the split core stator described in Non-Patent Document 1, time is required for assembling the rotating electric machine, the processing cost increases, and the manufacturing cost of the rotating electric machine increases. As described above, the three-dimensional gap structure of the split core stator described in Non-Patent Document 1 has a problem in that it takes time to assemble the rotating electric machine, increases the processing cost, and increases the manufacturing cost of the rotating electric machine. .

  The prior art of the axial gap type three-dimensional air gap rotating electrical machine is the invention of the present inventors. Assembling is an epoch-making invention that completely eliminates the drawbacks of the rotating electrical machine described in Patent Document 1, and completes the stator and the rotor separately and assembles them in the axial direction. In addition, since the winding uses the concentrated winding method of the conventional axial gap type rotating electric machine, the manufacturing cost can be suppressed compared to the distributed winding, and the winding is inexpensive. However, there was also a problem of leaving room for improvement in order to achieve higher torque.

  Therefore, the present invention has been made in view of the above-described problems, and provides a rotating electrical machine capable of further increasing torque and simplifying manufacturing cost by simplifying windings and wiring. With the goal.

  The rotating electrical machine according to the present invention is an axial gap type rotating electrical machine including a stator and a rotor that is rotatably disposed in an axial direction with respect to the stator via an air gap. A single-phase coil having a winding axis formed in parallel with the rotation axis is disposed concentrically with the rotation axis, and is disposed on the air gap side of the coil and protrudes along the rotation axis. A claw pole portion provided radially with the rotating shaft as a center, and the claw pole portion includes an outer claw pole portion magnetically coupled to an outer yoke of a yoke housing the coil; An inner claw pole portion arranged adjacent to the outer claw pole portion and magnetically coupled to the inner core yoke of the yoke is formed. Part is magnetically coupled to the opposite side of the air gap, and the tooth part formed on the claw pole part constitutes a plurality of teeth that are concentric arcs and project in the rotational axis direction, and the rotor The magnetic pole portions of the magnetic body in which concave portions along the axial direction are formed are arranged in an even number in the circumferential direction, and magnetized alternately with different polarities by a permanent magnet and distributed, and the plurality of teeth are arranged by the concave portions. The concentric arcuate tooth groove portion is configured so as to correspond to the above, and the concentric arcuate tooth enters the concentric arcuate tooth groove portion and is rotatably opposed so as to engage with a so-called three-dimensional air gap.

  In the rotating electric machine according to the present invention, it is preferable that the thickness of the claw pole portion provided on the stator in the axial cross section becomes thinner toward the outer air gap side.

  Further, in the rotating electrical machine according to the present invention, the coil includes a single-phase coil winding bobbin, and the single-phase coil winding bobbin includes a blade portion that attaches the claw pole portion to an outer peripheral surface on the rotor side. It is preferable to provide it.

  In the rotating electrical machine according to the present invention, it is preferable that at least the claw pole portion and the winding bobbin are subjected to the winding after resin molding.

  Further, in the rotating electrical machine according to the present invention, the two stators of the rotating electrical machine are concentrically arranged back to back, and the opposite side of the air gap of the stator is joined, It is preferable to arrange the rotors to face each other.

  Also, in the rotating electrical machine according to the present invention, when the three rotating electrical machines are arranged in common or coupled with each other and the phases of the stator or the rotor are shifted from each other by 120 degrees in electrical angle, Is preferred.

  In the rotating electrical machine according to the present invention, no permanent magnet can be used for the stator or the rotor.

  In the rotating electrical machine according to the present invention, it is preferable that at least one of the claw pole portion and the magnetic pole portion is a dust core or a sintered core.

  The rotating electrical machine according to the present invention is a single-phase annular coil in which the winding axis of the winding is formed parallel to the rotation axis, so that bobbin winding is possible, and the winding and electrical work are greatly reduced. Cost can be reduced. In addition, if the blade that serves as a guide for the claw pole portion is provided on the bobbin, the positioning accuracy of the claw pole portion can be improved and the assembly can be facilitated.

  In the rotating electrical machine according to the present invention, since the winding is an annular coil, an increase in the amount of copper due to an improvement in the winding occupancy rate in addition to the super concentrated winding effect is advantageous in increasing torque. When used as a generator, it is advantageous for high output. Further, if the thickness of the claw pole of the present invention is made thin in the radial outer peripheral direction, it becomes a countermeasure against magnetic saturation of the claw pole itself, and the bobbin becomes wide so that the coil can be easily wound.

  In addition, if the rotating electrical machine according to the present invention is a single-phase generator using one annular coil, an effect of increasing the linkage flux due to the three-dimensional air gap is added, and an inexpensive and high-output generator can be configured. Therefore, it is also suitable for hub dynamo conversion such as bicycles.

  Moreover, the rotating electrical machine according to the present invention is easy to assemble because the winding is applied after at least the claw pole portion and the winding bobbin are molded by resin molding. Further, when the claw pole part is composed of a dust core, since the outer periphery of the claw pole part is wrapped with synthetic resin, troubles such as cracking and chipping of the dust are eliminated, and the mechanical strength is enhanced.

  Further, the rotating electrical machine according to the present invention has an air gap facing portion between the stator teeth and the rotor teeth facing the axial solid gap, so that the assembly is easy and the facing area is increased, and the air gap portion permeance is large and highly efficient. A rotating electrical machine can be realized at low cost.

  In addition, the rotating electrical machine according to the present invention has a single-phase annular coil rotating electrical machine as a module, considering the phase in the direction of the rotation axis, and connecting two, two-phase, and three-connecting, three-phase An annular coil claw pole type three-dimensional air gap rotating electric machine can be realized.

  In addition, the rotating electrical machine according to the present invention facilitates the manufacture of the iron core by using a dust core or a sintered iron core in at least one of the claw pole portion and the magnetic pole portion, and the eddy current loss is close to zero. A low-cost and high-efficiency rotating electrical machine with low iron loss at high speed can be configured.

  Further, if the rotating electric machine according to the present invention is a two-phase, three-phase rotating electric machine and does not use a permanent magnet, it is possible to increase the torque of the stepping motor or SR motor by reluctance torque.

  Further, in the rotating electrical machine according to the present invention, if a powder iron core is employed in at least one of the claw pole part and the magnetic pole part, the iron core is not configured by a silicon steel sheet laminating system. No welding is required, and the silicon steel plate is not peeled off or warped due to the magnetic attractive force in the axial direction. Therefore, an inexpensive and highly reliable rotating electrical machine can be obtained.

Sectional drawing containing the axis | shaft of the rotary electric machine which shows embodiment of this invention. The A direction arrow directional view of FIG. FIG. 3 is a three-dimensional view of a stator yoke used in the rotating electrical machine according to the present embodiment. The three-dimensional view of the bobbin used for the rotary electric machine which concerns on this embodiment. The three-dimensional view of the claw pole for stators of the rotary electric machine which concerns on this embodiment. FIG. 3 is a three-dimensional view of a rotor magnetic pole of the rotating electrical machine according to the present embodiment. Sectional drawing including the axis | shaft of the modification which comprised the rotary electric machine which concerns on this embodiment as a two-phase rotary electric machine. Sectional drawing including the axis | shaft of the modification which comprised the rotary electric machine which concerns on this embodiment as a three-phase rotary electric machine. Sectional drawing containing the axis | shaft of a prior art. BB sectional drawing of FIG.

  The rotating electrical machine according to the present embodiment will be described below with reference to the drawings.

  FIG. 1 shows an example of the configuration of a rotating electrical machine according to this embodiment, and is a cross-sectional view including a rotation axis. FIG. 2 is a view of the stator of FIG. 1 as viewed from the direction of the rotation axis, and is a view taken in the direction of arrow A in FIG. FIG. 3 is an external view showing the stator yoke 2. FIG. 4 is an external view showing the winding bobbin 3, and FIG. 5 is an external view of the claw pole 1.

  The claw pole 1 is a so-called stator claw pole, but is simply referred to as a claw pole hereinafter. As shown in FIG. 5, the claw pole 1 is provided with a plurality of concentric arc-shaped teeth, and the thickness thereof is formed so as to gradually become thinner in the outer circumferential direction. As shown in FIG. 2, the claw pole 1 includes 16 claw poles 1 that are uniformly distributed in the circumferential direction to form a claw pole portion. The claw pole portion includes an inner center claw pole portion 1a and eight outer peripheral claw pole portions 1b adjacent to the inner center claw pole portion 1a.

  With reference to FIGS. 1-5, the structure of the stator of the rotary electric machine which concerns on this embodiment is demonstrated. As shown in FIG. 3, the stator yoke 2 is formed in a cylindrical shape with a bottom, and an outer peripheral wall 22 is formed by the outer peripheral yoke 22 protruding from the bottom, and is formed at a predetermined interval on the upper end of the outer peripheral yoke 22. A concave groove 21 is formed. In the rotating electrical machine according to the present embodiment, eight recess grooves 21 are provided.

  Further, an inner core yoke 23 is formed at the center of the bottom portion of the stator yoke 2 so as to protrude in parallel with the outer peripheral yoke 22, and as shown in FIGS. 5 is closely attached. The stator bush 5 is provided with eight convex portions 51 and eight concave portions 52 alternately on the outer periphery thereof.

  The inner claw pole portion 1a is not in contact with the groove of the concave portion of the stator yoke 2 but forms an air gap and is in close contact with the convex portion 51. The outer claw pole portion 1b is connected to the stator yoke 2 and the outer peripheral yoke 22. Are arranged so as to form an air gap in the recess 52 without contacting the stator bush 5. The inner claw pole portion 1a and the outer claw pole portion 1b are magnetically coupled to each other on the opposite side of the air gap via the stator yoke 2.

  Further, in order to position and guide the inner claw pole portion 1a and the outer peripheral claw pole portion 1b for easy positioning, as shown in FIG. While standing in the direction, a plurality of radial shapes are formed. As shown in FIG. 2, the inner claw pole portion 1a and the outer claw pole portion 1b are housed and fixed between the blades 34. As shown in FIG. 1, the collar portion 31 is assembled on the rotor side to constitute a stator. doing. In addition, the reverse side collar part 32 is arrange | positioned at the non-rotor side which is a non-air gap side.

  The collar portions 31 and 32 are connected by a coil core portion 33 extending in the rotation axis direction, and the winding wire 4 is wound around the coil core portion 33. The winding 4 is wound by concentrated winding, and this concentrated winding is advantageous for high torque, and the winding is simplified, so that it can be directly wound into the slot, and the winding is inexpensive. Become. A coil system capable of maximizing the merit of this concentrated winding is an annular coil system in which one phase is composed of one annular coil. The rotating electrical machine according to the present embodiment employs this annular coil to achieve low cost winding and high torque. Note that a lead wire 12 is connected to the winding 4 and can be taken out from the groove 21 in the concave portion of the stator yoke 2. A bearing 6 is provided on the stator bush 5 and a bearing 7 is provided at the center of the stator yoke 2 to hold the rotating shaft 8 rotatably.

  The bobbin 3 in FIG. 4 is completed with a resin mold, and then wound, and the above description is made assuming that the inner claw pole portion 1a and the outer claw pole portion 1b are stored in the portion partitioned by the blade portion 34. Did. On the other hand, the inner claw pole portion 1a and the outer claw pole portion 1b are radially arranged at predetermined positions, and the claw pole in which the bobbin 3 of FIG. Make a bobbin complex and then wind it to make assembly easier and improve accuracy. Further, when the claw pole is composed of a dust core, an effect of enhancing the mechanical strength of the dust core can be obtained. In this case, the shape of the stator facing the rotor is the same as that shown in FIG.

  FIG. 6 is an external view of the magnetic pole portion 9 of the rotor, and a large number of teeth are provided in a concentric arc shape like the claw pole 1 and the like. However, the difference is that the wall thickness is uniform without being thinned in the outer circumferential direction like the claw pole 1 or the like. The configuration of the rotor will be described with reference to FIGS. Although the illustration seen from the axial direction of the rotor is omitted, 16 magnetic pole portions 9 of the rotor are equally arranged in the circumferential direction, and the inner claw pole portion 1a and the outer claw pole portion 1b are connected to the air gap. Teeth and grooves engage in a three-dimensional air gap and face each other in a freely rotatable manner. Sixteen permanent magnets 10 are provided so that the magnetic pole portions 9 of the 16 rotors have different polarities alternately, and are closely magnetized on the side opposite to the teeth of the magnetic pole portions 9 of the rotor. A rotor yoke 11 is in close contact with the permanent magnet 10 and its central portion is fixed to the shaft 8 to constitute a rotor. The permanent magnet may adopt a so-called spoke magnet system in which the permanent magnets are radially arranged in a gap formed in the circumferential direction of the magnetic pole portions 9 of the 16 rotors. In this case, the permanent magnets are magnetized with different polarities in the circumferential direction.

  FIG. 7 shows a two-phase annular coil claw pole type three-dimensional air gap rotating electric machine using two single-phase rotating electric machines having the configuration shown in FIG. In this case, two stators of the single-phase rotating electrical machine are fixed to each other back to back. Then, the rotor of the single-phase rotating electrical machine may be disposed on both sides of the stator so that the stator and the magnetic pole portion 9 of the rotor have an electrical angle of 90 ° on the one-phase side and the two-phase side via the air gap. . However, when used as a single-phase AC generator, two of them may have the same phase. In this case, the cogging torque increases but the output is doubled.

  7 are the same as those in FIG. 1 except for the rotating shaft. The rotating shaft 13 in FIG. 7 is appropriately lengthened so as to span two phases as compared with the rotating electrical machine shown in FIG. Further, although not shown in the drawings, it is possible to constitute a rotating electric machine as a variable magnetoresistive VR stepping motor or SR motor that does not use the permanent magnet 10 shown in FIG. In this case, since the permanent magnet 10 is not used, the manufacturing cost can be suppressed and the cost can be reduced. In addition, although the torque is reduced by about 40% when using a permanent magnet, this degree of torque reduction can be recovered by the effect of high efficiency by the three-dimensional air gap, and the air gap is made smaller and rotated. If the number is set high, the output as an electric motor does not decrease so much, and it is a structure that is sufficiently established in terms of cost performance.

  FIG. 8 shows a three-phase annular coil claw pole type three-dimensional air gap rotating electric machine in which three single-phase rotating electric machines are arranged in the same direction as modules. In this case, higher torque can be expected while the winding is simpler than the conventional three-phase machine. The configuration is such that three stators are connected and fixed by the housing 14, and the phases of the three stators and the magnetic pole portion 9 of the rotor are different from each other by 120 degrees in electrical angle. However, in the case of a single-phase AC generator, three of them may be in the same phase. In this case, the cogging torque increases, but the output can be tripled. 8 are the same as those in FIG. 1 except for the rotating shaft. The rotating shaft 15 in FIG. 8 is appropriately lengthened so as to span three phases as compared with the rotating electrical machine shown in FIG. Even in the case of the rotating electrical machine shown in FIG. 8, it is also possible to configure a variable magnetoresistive VR stepping motor or SR motor that does not use the permanent magnet 10. In such a configuration, since the permanent magnet 10 is not used, the cost is reduced. Therefore, even if the torque is reduced by about 40% when the permanent magnet is used, this degree of torque reduction can be recovered by the three-dimensional air gap effect. However, if the air gap is made smaller and the rotational speed is set higher, the output as a motor will not decrease so much, and it will be sufficient if considered in terms of cost performance.

  Since the BLDC motor uses a permanent magnet, an electric input for the field magnetic flux is not required, so that the rotating electric machine is highly efficient. However, in recent years, the price of rare earth magnets such as neodymium magnets having high magnetic energy among permanent magnets has soared. Therefore, it is necessary to reduce the amount of magnets used in a BLDC motor to increase efficiency. The present invention as a solution can be said to be extremely effective due to the synergistic effect of the annular coil and the solid axial gap.

  In addition, the claw pole 1 and the magnetic pole part 9 are formed of a dust core or a sintered iron core. The compacted iron core is a soft magnetic iron powder mixed with a small amount of resin for the purpose of lubricant or binder to increase the electrical insulation between the iron powder to reduce eddy currents and to be sintered after compression molding. is there. When using a powder iron core for a rotating electrical machine, the silicon steel sheet stacking type has a two-dimensional simple shape, but a three-dimensional complex shape is possible, and there is little eddy current loss of iron loss. There are features. The axial gap type rotating electrical machine is not suitable because the magnetic circuit is in the axial direction when the magnetic pole portion or the like is formed by stacking silicon steel plates. That is, the magnetic flux is difficult to pass in the stacking direction of the silicon steel plates. On the other hand, the dust core and the sintered core can be manufactured in a complicated shape and have no magnetic flux direction. For this reason, it can be said that this is an iron core manufacturing method suitable for configuring the claw pole 1 and the magnetic pole portion 9 used in the rotating electrical machine according to the present embodiment.

  9 is a cross-sectional view including the shaft of the prior art, and FIG. 10 is a cross-sectional view in the direction B of FIG. 9, which is the technique of Patent Document 2 described above. The same parts as those in FIG. The stator 20 has six magnetic poles protruding in the axial direction, and a winding 121 is wound around each of the magnetic poles. The magnetic poles are provided with concentric arc-shaped teeth and mesh with the tooth grooves provided in the magnetic pole portion 9 of the rotor to constitute an axial three-dimensional air gap type rotating electrical machine. However, the amount of wound copper is less than that of the rotating electrical machine according to the present embodiment in order to aim for a higher torque at a lower cost, and the electrical work is complicated, and there is a problem in aiming at a higher torque at a lower cost. Was.

  The rotating electrical machine according to the present invention can be used for an electric motor or a generator, and is extremely practical, inexpensive, robust, light and thin, suitable for high torque and high efficiency. Therefore, it is expected to make a significant industrial contribution.

1 claw pole,
2 Stator yoke,
3 bobbins,
4, 121 windings,
5 Stator bush,
6, 7 bearings,
8 rotation axis,
9 magnetic pole,
10 permanent magnet,
11 rotor yoke,
12 lead wires,
20 Stator.

Claims (8)

In an axial gap type rotating electrical machine comprising a stator and a rotor arranged to be rotatable in an axial direction with respect to the stator via an air gap,
The stator includes a coil in which a single-phase coil having a winding axis formed in parallel with the rotation axis is provided concentrically with the rotation axis, the air gap side of the coil, and the rotation axis. A tooth portion protruding along, and a claw pole portion radially arranged around the rotation axis,
The claw pole portion includes an outer peripheral claw pole portion that is magnetically coupled to an outer peripheral yoke of a yoke that houses the coil, and an inner core that is disposed adjacent to the outer peripheral claw pole portion and is magnetically coupled to the inner yoke of the yoke. The claw pole part
The inner claw pole part and the outer claw pole part are magnetically coupled on the opposite side of the air gap,
The tooth portion formed in the claw pole portion constitutes a plurality of teeth that are concentric arcs and project in the direction of the rotation axis,
The rotor is provided with an even number of magnetic pole portions of a magnetic body in which concave portions along the axial direction are formed in the circumferential direction, and magnetized alternately with different polarities by a permanent magnet, and is distributed and arranged by the concave portions. Concentric arc-shaped tooth gap is configured to correspond to multiple teeth,
A claw pole three-dimensional air gap type rotating electrical machine characterized in that the concentric arc-shaped teeth enter a concentric arc-shaped tooth gap and are rotatably opposed so as to engage with each other by a so-called three-dimensional air gap. In the rotating electrical machine according to claim 1,
The rotating electric machine according to claim 1, wherein the claw pole portion provided in the stator has an axial cross section whose thickness on the side opposite to the air gap decreases toward the outer peripheral side. In the rotating electrical machine according to claim 1 and 2,
The coil includes a single-phase coil winding bobbin;
The single-phase coil winding bobbin is provided with a blade portion for attaching the claw pole portion to an outer peripheral surface on the rotor side. The rotating electrical machine according to any one of claims 1 to 3, wherein at least the claw pole portion and the bobbin for winding are resin-molded and then the winding is performed. In the rotating electrical machine according to claims 1 to 4,
Two stators of the rotating electrical machine are arranged concentrically, back to back, and the opposite side of the stator to the air gap is coupled, and the rotor is arranged opposite to each other on the air gap side. Rotating electric machine. In the rotating electrical machine according to claims 1 to 4,
A rotating electrical machine comprising three rotating electrical machines, the axes of which are arranged in common or coupled, and the phases of the stator or the rotor being shifted from each other by an electrical angle of 120 degrees. In the rotating electrical machine according to claim 5 or 6,
A rotating electrical machine, wherein no permanent magnet is used for the stator or the rotor. The rotating electrical machine according to any one of claims 1 to 7,
At least one of the claw pole part and the magnetic pole part is a dust core or a sintered iron core.

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