JP2016119791A - Axial gap type rotary electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary electric machine in simple structure capable of obtaining large magnet torque without power supply from the outside by effectively utilizing a space harmonic magnetic flux that is generated in an armature coil.SOLUTION: An axial gap type rotary electric machine M comprises two rotors 200 and 300 which are rotationally driven around shafts RS, and a stator 100 in which the rotors are opposite to both surfaces in an axial direction of a shaft. The axial gap type rotary electric machine also comprises: a plurality of armature coils 11 which are disposed around a shaft of the stator; a plurality of induction coils 21 and a plurality of field coils 22 which are disposed around the shafts of the two rotors; and a diode by which induction currents generated in the induction coils are rectified and supplied to the field coils.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a double rotor axial gap type rotating electrical machine using a winding field.

  A rotating electrical machine is configured to face a rotor and a stator through a gap and form a magnetic circuit by, for example, interlinking a magnetic flux generated by an armature coil arranged on the stator side to the rotor side to form a rotational force (reluctance). Torque), and for the purpose of assisting the rotational force, permanent magnets and field windings (electromagnets) are arranged to use the magnet torque.

  By the way, in such a rotating electric machine, since the spatial harmonic component is superimposed on the magnetic flux generated by the armature coil, the spatial harmonic magnetic flux is also linked to the side where the magnetic flux is linked. Become.

  However, the permanent magnet has the disadvantage that when the space harmonic magnetic flux is interlinked, the magnetic force is irreversibly reduced due to heat generation due to eddy currents generated inside and a decrease in coercive force. For this reason, there exists a problem that the magnetic force of the permanent magnet will fall if it is a type which embeds a permanent magnet in the rotor side where a space harmonic magnetic flux interlinks as described in patent document 1, for example.

  In order to solve this problem, it is necessary to use an expensive magnet to which a large amount of heavy rare earth such as dysprosium (Dy) or terbium (Tb) having a high coercive force is added, which increases the cost.

JP 2006-187091 A

  Therefore, the present invention has a simple structure that can effectively obtain a large magnet torque without supplying electric power from the outside by effectively effectively using the spatial harmonic magnetic flux generated in the armature coil without using a permanent magnet. The purpose is to provide a rotating electric machine.

  An aspect of the invention of a rotating electrical machine that solves the above problems includes an axial gap that includes two rotors that are driven to rotate about a rotation shaft, a stator that faces the rotor on both surfaces in the axial direction of the rotation shaft, and A plurality of armature coils arranged around the axis of the rotating shaft of the stator, a plurality of induction coils arranged around the axis of the rotating shaft of each of the two rotors, A plurality of field coils; and a rectifying element that rectifies an induced current generated in the induction coil and supplies the rectified current to the field coil.

  That is, two rotors face each other in the axial direction of a stator having an armature coil around the rotation axis, and each of the two rotors has a plurality of induction coils and a plurality of around the rotation axis. It has a field coil, and is constructed in such a structure that an induced current generated in the induction coil is rectified by a rectifying element and supplied to the field coil.

  According to one aspect of the present invention, an axial gap type structure in which the rotor faces the both sides of the stator from the axial direction is formed, and the spatial harmonic magnetic flux generated by the armature coil of the stator is linked to the rotor on both sides. Can be made.

  Therefore, it is possible to easily construct a rotor having a symmetrical structure so as to generate a similar magnet torque on both sides of the stator. Further, the space harmonic magnetic flux can be effectively used effectively without using a permanent magnet, and the rotating shaft can be integrally rotated with a large magnet torque of the two rotors without supplying electric power from the outside.

FIG. 1 is a diagram showing an axial gap type rotating electrical machine according to an embodiment of the present invention, and is an exploded perspective view showing a schematic overall configuration thereof. FIG. 2 is a perspective view showing the structure of the stator. FIG. 3 is a perspective view showing the structure of the rotor. FIG. 4 is a simple circuit configuration diagram in which the induction coil and the field coil are connected via a diode. FIG. 5A is a model diagram illustrating winding of an armature coil, an induction coil, and a field coil around a core material. FIG. 5B is a magnetic force diagram illustrating magnetic fluxes generated and linked in the armature coil, the induction coil, and the field coil. FIG. 6 is a magnetic flux characteristic diagram showing the magnetic flux density and magnetic flux vector of the third-order spatial harmonic magnetic flux in the rotating coordinate system. FIG. 7 is a magnetic force diagram illustrating magnetic fluxes generated and interlinked by an armature coil, an induction coil, and a field coil in the case of a radial gap type without an auxiliary pole. FIG. 8 is a magnetic force diagram illustrating magnetic fluxes generated and interlinked by an armature coil, an induction coil, and a field coil in the case of a radial gap type with an auxiliary pole. FIG. 9 is a graph showing the magnetic flux density that changes in accordance with the rotation angle when the armature coil is linked via a gap with concentrated winding or distributed winding. FIG. 10 is a graph showing the magnetic flux density for each order of the spatial harmonic magnetic flux superimposed on the magnetic flux shown in FIG. FIG. 11 is a graph showing torque waveforms obtained in order to compare the IPMSM, the radial gap type without a complementary pole, and the radial gap type with a complementary pole.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIGS. 1-11 is a figure which shows the axial gap type rotary electric machine which concerns on one Embodiment of this invention.

  In FIG. 1, the rotating electrical machine M includes a stator 100 and two rotors 200 and 300 that are formed so that the outer shape is substantially a disk shape. As will be described later, energy is supplied to the rotors 200 and 300 from the outside. It has a structure that does not need to be input and has, for example, performance suitable for mounting in a hybrid vehicle or an electric vehicle.

  In the rotating electrical machine M, two rotors 200 and 300 are respectively attached to a shaft (rotating shaft) RS penetrating the shaft center so as to be sandwiched between both surfaces of the stator 100 via a gap G. The stator 100 rotatably supports the shaft RS, and the rotors 200 and 300 are fixed to the shaft RS. That is, the rotating electrical machine M is constructed as an axial gap double rotor type motor that faces the stator 100 sandwiched between the two rotors 200 and 300 in the axial direction of the shaft RS.

  As shown in FIG. 2, the stator 100 includes a plurality of stator cores 15 having a short bar shape and a substantially trapezoidal cross section, and an armature coil to which a three-phase AC power source (not shown) is connected to the stator core 15. 11 are wound around and arranged so as to be positioned around the axis of the shaft RS.

  The stator core 15 is made of a magnetic material having a high magnetic permeability, and is extended in a direction parallel to the shaft RS so that the three-phase armature coils 11u, 11v, and 11w are in parallel with each other with 6 poles without a gap. It is concentrated around.

  That is, the armature coil 11 is formed into a winding coil having a center line parallel to the shaft RS by using 18 status lots 17 between the stator cores 15, thereby providing 18 poles around the shaft RS (18 magnetic poles). Are evenly arranged. In short, the armature coils 14 are wound around the axial direction of the rotation axis, and are arranged equally around the rotation axis.

  As shown in FIG. 1, the stator core 15 is held at both ends by two disc-shaped holding plates 16 sandwiched between the rotors 200 and 300. The both end portions 15a of the stator core 15 are inserted into the opening holding holes 16a and are held in a state where the end surfaces 15b are exposed. The holding plate 16 is made of a non-magnetic material so as not to prevent the formation of a high-quality magnetic circuit, and is freely rotatable through a shaft RS by a bearing (not shown) attached to the center. I support it.

  Thereby, the stator core 15 is disposed on the stator 100 so that the end surface 15b of the end portion 15a faces the end surface 25b of the end portion 25a of the rotor core (core material) 25 described later of the rotors 200 and 300 via the gap G. ing. The stator 100 can generate magnetic flux by energizing the armature coil 11 with AC power, and can link the magnetic flux from the end surface 15 b of the stator core 15 to the end surface 25 b of the rotor core 25 of the rotors 200 and 300.

  For this reason, in the rotating electrical machine M, a closed magnetic circuit can be formed by bypassing the magnetic flux linked to the rotor core 25 positioned on both sides of the stator core 15 by the yoke 26 described later, and the magnetic flux forming the magnetic circuit The two rotors 200 and 300 sandwiching the stator 100 can be relatively rotated by a reluctance torque (main rotational force) that attempts to minimize the magnetic path of the rotor.

  For this reason, the rotating electrical machine M needs to integrally rotate the rotors 200 and 300 fixed to the common shaft RS with the same rotational force, and the rotors 200 and 300 are symmetrical on both sides of the stator 100. Built in structure.

  As a result, the rotating electrical machine M can output, as mechanical energy, electrical energy that is energized and input from the shaft RS that rotates integrally with the rotors 200 and 300 that rotate relative to each other on both sides of the stator 100 while matching the axis. .

  At this time, in the rotating electrical machine M, a spatial harmonic component is superimposed on the magnetic flux interlinked from the stator core 15 to the rotor core 25. For this reason, also on the rotor 200, 300 side, an electromagnetic current can be obtained by generating an induced current in a built-in coil by utilizing a change in magnetic flux density of a spatial harmonic component of a magnetic flux linked from the stator 100 side. .

  Specifically, the magnetic flux generated by the armature coil 11 of the stator 100 is linked to the rotor 200, 300 (rotor core 25) by superimposing a spatial harmonic component on the main magnetic flux that fluctuates at the fundamental frequency of the AC power to be applied. It is supposed to be.

  For this reason, in the rotors 200 and 300, the spatial harmonic magnetic flux that temporally changes at a period different from the fundamental frequency of the main magnetic flux is linked to the rotor core 25. By installing a coil in the rotor core 25, separately, An induced current can be generated efficiently without connecting to an external power source or the like and inputting power. As a result, the spatial harmonic magnetic flux that causes iron loss can be recovered as energy for self-excitation.

  Therefore, the rotating electrical machine M uses the space formed between the adjacent side surfaces of the rotor core 25 as a rotor slot 27 as shown in FIG. Are arranged to arrange the induction coil 21 and the field coil 22.

  Specifically, each of the rotors 200 and 300 includes a plurality of rotor cores 25 having a short rod shape and a substantially trapezoidal cross section, and the induction coil 21 and the field coil 22 that are not connected to an external power source. Are wound together and arranged so as to be positioned around the axis of the shaft RS.

  The rotor core 25 is made of a magnetic material having a high magnetic permeability. The rotor core 25 is extended in a direction parallel to the shaft RS, and the induction coil 21 and the field coil 22 are spaced apart from each other so as to have two upper and lower stages as a common core material. There are no concentrated windings in parallel.

  That is, the induction coil 21 and the field coil 22 are formed in a winding coil having a center line parallel to the shaft RS by using 12 rotor slots 27 between the rotor cores 25, so that 12 poles ( The number of slots 12) is evenly arranged. In short, the induction coil 21 and the field coil 22 are wound around the axis direction of the rotation axis, and are equally arranged around the rotation axis.

  Therefore, the rotating electrical machine M has a configuration ratio S / between the number of slots S (12) of the induction coil 21 and the field coil 22 on the rotor 200, 300 side and the number of magnetic poles P (18) of the armature coil 11 on the stator 100 side. P is formed to be 2/3.

  Further, the rotor core 25 is integrally formed on the one surface side of the disk-shaped yoke 26 with the end surface 15b of the stator core 15 separated from the end portion 25a facing the end surface 25b via the gap G. The yoke 26 is attached to the central portion so as to be integrated with the shaft RS.

  With this structure, the magnetic flux interlinking from the end face 15b side of the stator core 15 to the end face 25b of the rotor core 25 bypasses the yoke 26 on the back side of the end face 25b and faces the end face 25b of the separate rotor core 25. A closed magnetic circuit can be formed by re-linking to 15b.

  The induction coil 21 is disposed on the side of the end 25a that can be separated from the yoke 26 of the rotor core 25 and can effectively link the spatial harmonic magnetic flux from the stator core 15, and the field coil 22 is The rotor core 25 is disposed on the side of the connecting portion 25 c close to the yoke 26.

  Thereby, the rotating electrical machine M can link the magnetic flux with high density from the end surface 15b of the stator core 15 to the end surface 25b of the rotor core 25 through the small gap G, and a spatial harmonic component included in the interlinked magnetic flux. An induction current can be generated in the induction coil 21 by (change in magnetic flux density) and supplied to the field coil 22.

  The field coil 22 can generate a magnetic flux (electromagnetic force) by self-exciting the induced current received from the induction coil 21 as a field current. The magnetic flux is generated from the end face 25 b of the rotor core 25 to the stator core 15. It can be linked to the end face 15b.

  Therefore, the rotating electrical machine M can obtain a magnet torque (auxiliary rotational force) separately from the magnetic flux of the armature coil 11 that generates the main rotational force, and can assist the rotational drive of the rotors 200 and 300.

  At this time, the rotating electrical machine M generates an electromagnetic force by causing the rotor core 25 to function as an electromagnet by supplying an AC induced current generated by the induction coil 21 to the field coil 22 as a DC field current. Therefore, in order to effectively use the AC induced current, the induction coil 21 and the field coil 22 are respectively incorporated in the closed circuit 29 shown in FIG.

  Specifically, as shown in FIG. 4, the induction coil 21 is concentratedly wound around the rotor core 25 in the same direction, and is connected in series every other (one pole) with the same circumferential direction. In the rotating electrical machine M, one end side of two sets of induction circuits 21A and 21B of induction coils 21a1 to 21a6 and induction coils 21b1 to 21b6 connected in series are connected via diodes (rectifier elements) 23A and 23B in parallel. Has been. In addition, although the case where the induction coil 21 is connected in series every other pole is described as an example, the present invention is not limited to this, and the induction coil 21 may be divided into two in the circumferential direction and connected in series.

  The field coil 22 is concentratedly wound around the rotor core 25 so that the end 25a side and the connecting portion 25c side of the rotor core 25 are alternately connected in series so that the adjacent windings are in opposite directions. Has been. In this rotating electrical machine M, the field circuits 22N of the field coils 22a1 to 22a6, which are connected in series, function so that the end 25a side of the rotor core 25 functions as an N pole, and the field coils 22b1 to 22b6 The field circuit 22S is connected in parallel to the induction circuit 21A and the diode 23A, and the induction circuit 21B and the diode 23B so that the end 25a side of the rotor core 25 functions as the S pole.

  That is, the induction coil 21 and the field coil 22 are incorporated together with the diodes 23A and 23B in the closed circuit 29 that is not connected to a circuit such as an external power source as the field circuits 22N and 22S and the induction circuits 21A and 21B. It is.

  With this circuit configuration, the rotating electrical machine M allows the AC induced current generated in the induction coil 21 to be half-wave rectified through the diodes 23A and 23B to be adjusted to a DC field current, and then combined to be connected in series. The supplied field coil 22 is supplied. For this reason, in this rotating electrical machine M, it is possible to generate a large magnetic flux (electromagnetic force) by effectively self-exciting by the DC field current merged for each field coil 22, and the field circuits 22N and 22S are generated. Each of the stator cores 15 of the stator 100 can function as an electromagnet that faces the N pole or the S pole.

  Further, even when the induction coil 21 and the field coil 22 are multipolarized, the number of diodes 23A and 23B is reduced by using all of the field coils 22 in series. In order to avoid mass use, the diodes 23A and 23B do not form a general H-bridge type full-wave rectifier circuit, but are connected so that each has a phase difference of 180 degrees, and one of the induced currents The neutral-point clamp type half-wave rectifier circuit (rectifier element) that outputs half-wave rectified by inverting the signal is formed.

  As shown in FIG. 1, the rotating electrical machine M includes a case 32 and a circuit board 33 so as to rotate integrally with an end plate 30 made of an insulating material fixed to the back side of the rotors 200 and 300 with respect to the stator 100. It is attached. The circuit board 33 is compactly formed with a connection pattern (not shown) for connecting the induction coil 21 and the field coil 22, and the pin electrodes 23 c of the diodes 23 </ b> A and 23 </ b> B housed in the case 32 are used as the connection pattern. By being connected, a closed circuit 29 (illustrated in FIG. 4) is formed so as to rotate integrally with the rotors 200 and 300.

  The end plate 30 is formed in a disk shape having the same diameter as that of the yoke 26 of the rotors 200 and 300, and is fixed to the shaft RS in a state of facing the back side of the yoke 26 with respect to the rotor core 25. A fixed claw 30a is fitted into a notch 26a formed on the back side of the rotor to make it relatively non-rotatable and rotate integrally with the rotors 200 and 300.

  The circuit board 33 is formed in a disk shape having substantially the same diameter as that of the end plate 30 and is fixed in close contact with the back side of the rotors 200 and 300 with respect to the yoke 26. The circuit board 33 includes the diodes 23A and 23B drawn to the outside. The pin electrode 32a is bent and fixed so that one surface side of the case 32 is in close contact.

  Here, the induction coil 21 and the field coil 22 perform a magnetic field analysis and spatial harmonics so as to effectively use the third-order spatial harmonic magnetic flux interlinked from the end surface 15b of the stator core 15 to the end surface 25b of the rotor core 25. It is installed so that an induced current can be generated efficiently after confirming the magnetic path. Specifically, as described above, by setting the composition ratio S / P of the number of slots S of the rotors 200 and 300 and the number of magnetic poles P of the stator 100 to 2/3, the 3f-order spatial harmonics in the rotating coordinate system are obtained. A wave magnetic flux (f = 1, 2, 3,...) Is formed in a structure that can be used efficiently.

  Specifically, for example, a high-order spatial harmonic magnetic flux in the rotating coordinate system has only a waveform that vibrates only near the surface of the end face 25b of the rotor core 25, and therefore, an induction current can be efficiently generated in the induction coil 21. Can not. On the other hand, when the third-order spatial harmonic magnetic flux in the rotating coordinate system is to be recovered, the frequency is higher than the fundamental frequency input to the armature coil 11, and therefore pulsates in a short period and effectively becomes the induction coil 21. An induced current can be generated. For this reason, the loss energy of the spatial harmonic component superimposed on the magnetic flux of the fundamental frequency can be efficiently recovered and rotated.

  In addition, as understood from the magnetic field analysis of the magnetic flux density distribution in the same manner as described above, the magnetic flux density distribution is also distributed in the circumferential direction within a mechanical angle of 360 degrees according to the ratio of the number of salient teeth P and the number of status lots S. Therefore, uneven distribution is also recognized in the electromagnetic force distribution acting on the stator 100.

  For this reason, in the rotating electrical machine M, by adopting a structure in which the composition ratio S / P between the number of slots S of the rotors 200 and 300 and the number of magnetic poles P of the stator 100 is 2/3, the entire circumference with a mechanical angle of 360 degrees is adopted. The magnetic fluxes having a uniform density distribution can be linked to each other, and the rotors 200 and 300 can be relatively rotated with high quality while facing the stator 100.

  Thereby, in the rotating electrical machine M, it is possible to efficiently recover the loss energy by effectively using the space harmonic magnetic flux without causing a loss, and to reduce the electromagnetic vibration significantly and to rotate with high silence. .

  In addition, the induction coil 21 and the field coil 22 adopt a concentrated winding structure, so that it is not necessary to wind in a circumferential direction over a plurality of slots, and the overall size can be reduced. In addition, the induction coil 21 can efficiently generate and recover induced current due to the linkage of the third-order spatial harmonic magnetic flux, which is a lower order, while reducing the copper loss loss on the primary side in the rotating coordinate system. Energy loss can be increased.

  Furthermore, the induction coil 21 generates an induced current more effectively than the case of using the second-order spatial harmonic magnetic flux in the rotating coordinate system by using the third-order spatial harmonic magnetic flux in the rotating coordinate system. be able to. More specifically, the induced current can be recovered efficiently by using the third-order spatial harmonic magnetic flux rather than the second-order so as to increase the time change of the magnetic flux to a large current.

  Thus, as shown in FIG. 5A, the rotating electric machine M has the end faces 25b of the respective rotor cores 25 of the rotors 200 and 300 via the gaps G on both end faces 15b of the stator core 15 around which the armature coil 11 of the stator 100 is wound. The induction coil 21 is wound around the end 25 a of each rotor core 25, and the field coil 22 is wound around the yoke 26 (connection portion 25 c) of each rotor core 25.

  As a result, as shown in FIG. 5B, the rotating electrical machine M causes the magnetic flux MF generated by energizing the armature coil 11 to be linked between the stator core 15 and the rotor cores 25 on both sides to bypass the yoke 26. The two rotors 200, 300 can be rotated relative to the stator 100. In addition to this, the spatial harmonic magnetic flux HF superimposed on the magnetic flux MF is also linked from the stator core 15 to the rotor cores 25 on both sides, and is efficiently recovered by the induction coils 21 on the respective end portions 25a side to generate the induced current. The field current obtained by rectifying the induced current by the diodes 23 </ b> A and 23 </ b> B can be supplied to the field coil 22. Therefore, for example, in FIG. 6, the rotating electrical machine M is represented by a magnetic flux vector V indicating the magnetic flux density of the third-order spatial harmonic magnetic flux HF linked between the stator core 15 and the two rotor cores 25 on both sides. The shaft RS can be rotated with a large magnet torque by interlinking the spatial harmonic magnetic flux HF with a high magnetic flux density between the stator core 15 and the two rotor cores 25 on both sides.

  On the other hand, for example, in the case of a radial gap type rotating electrical machine in which the stator and the rotor face each other via a gap in the radial direction, an inner rotor and an outer rotor having different diameters are arranged so as to sandwich the stator therebetween. become. Even in the case of this structure, it is desired to arrange a winding coil having a symmetrical structure on each of the rotors, but the area facing in the radial direction is greatly different between the inner rotor and the outer rotor, resulting in a large difference in rotational torque.

  For this reason, in the radial gap type rotating electrical machine, it is structurally impossible to ensure a larger space interlinking space harmonic magnetic flux than the axial gap type, and the armature coil 11 is concentrated and the space harmonics are concentrated. There is an inconvenience that even if the generation amount of wave magnetic flux is increased, it cannot be effectively used. On the other hand, the axial gap type rotating electrical machine M has a larger amount of leakage flux than the radial gap type due to its structure, but since the leakage can be effectively recovered, the spatial harmonic flux is effectively interlinked. Can be used.

  For this reason, in the case of a radial gap type rotating electric machine using one rotor, as shown in FIG. 7, one rotor core 45 is connected to one end face 35b of the stator core 35 around which the armature coil 31 is wound via a gap G. The end face 45b faces each other. As a result, in this structure, the spatial harmonic magnetic flux HF superimposed on the magnetic flux MF generated by energizing the armature coil 31 cannot be efficiently recovered, and a large magnet torque cannot be generated. The iron loss on the side increases compared to the axial gap double rotor type rotating electrical machine M.

  Further, as shown in FIG. 8, even in a radial gap type rotating electrical machine, in order to recover a larger amount of spatial harmonic magnetic flux HF, an auxiliary core for recovery 48 is arranged in a rotor slot 47 between the rotor cores 45. It is also conceivable to wind the induction coil 49. However, even with this structure, the magnetic harmonic flux HF leaking to one side of the stator core 35 can only be recovered, so that the obtained magnet torque does not reach the rotating electrical machine M. Further, in this structure, since the complementary pole core 48 that links the magnetic flux between the rotor cores 45 is disposed, there is a conflicting problem that the salient pole ratio on the rotor side becomes small.

  Further, in the rotating electrical machine M, the armature coil 11, the induction coil 21 and the field coil 22 each having a winding coil concentrated winding are arranged on the stator 100 and the rotors 200 and 300, respectively. It can also be wound. However, the magnetic flux density linked between the end face 15b of the stator core 15 and the end face 25b of the rotor core 25 is compared with the case where the armature coil 11, the induction coil 21 and the field coil 22 are concentrated or distributedly wound. A magnetic flux density waveform as shown in FIG. When this magnetic flux density waveform is subjected to electromagnetic field analysis, as shown in FIG. 10, in the case of concentrated winding, the second-order spatial harmonic magnetic flux in the stationary coordinate system (third-order in the rotating coordinate system) is more than in the case of distributed winding. It can be seen that it also contains a lot. As a result, in the rotating electrical machine M, by adopting concentrated winding, a larger amount of spatial harmonic magnetic flux that penetrates deeper into the end face 25b of the rotor core 25 than in the case of distributed winding is linked to the induction coil 21 to induce an induced current (field It can be seen that it is more advantageous to select concentrated winding.

  From this, as shown by a torque waveform in FIG. 11, when the rotating electrical machine M starts to supply an alternating current to the armature coil 11 of the stator 100 sandwiched between the two rotors 200 and 300 in the axial direction, In the case of this axial gap double rotor type, the shaft RS can be rotated with high torque as shown by a solid line in the drawing. On the other hand, in the radial gap type structure of FIG. 7 shown by the alternate long and short dash line in FIG. 11 and the structure of FIG. 8 shown by the alternate long and two short dashes line in FIG. As with the axial gap double rotor type rotating electrical machine M, a large torque cannot be obtained. Further, as shown by a dotted line in FIG. 11, an axial gap double rotor is also used in an IPMSM (Interior Permanent Magnet Synchronous Motor) structure in which a permanent magnet is embedded in a rotor and the magnet torque is used for the purpose of obtaining a high torque. It can be seen that the shaft RS cannot be driven to rotate with a large torque unlike the rotary electric machine M of the type.

  Thus, in the present embodiment, the stator 100 and the rotor 200 in which the armature coil 11, the induction coil 21, and the field coil 22 that are parallel in the winding direction around the shaft RS are constructed in an axial gap type double rotor type. , 300, the spatial harmonic magnetic flux superimposed on the main magnetic flux generated by the armature coil 11 can be effectively linked to the induction coils 21 on both sides. As a result, the induction current generated in the induction coil 21 can be efficiently supplied to the field coil 22 as a field current.

  Therefore, without using a permanent magnet (without generating a magnetic force drop due to the spatial harmonic magnetic flux) and without supplying electric power from the outside, the spatial harmonic magnetic flux can be effectively used effectively together with the reluctance torque. The magnet torque can be applied to each of the rotors 200 and 300 evenly to be driven to rotate with a large rotational force.

  Here, as another aspect of the present embodiment, the stator core 15 and the rotor core 25 are not limited to being formed by a laminated structure of electromagnetic steel plates, and for example, the surface of magnetic particles such as iron powder is subjected to insulation coating treatment. A so-called SMC core, which is a powder magnetic core obtained by further compression-molding and heat-treating soft magnetic composite powder (Soft Magnetic Composites), or an aluminum conductor may be used.

Moreover, the rotary electric machine M may be constructed in a hybrid type in which permanent magnets are additionally arranged in the rotors 200 and 300, or the magnet torque may be obtained in a hybrid field type.
Further, as the rectifying element, not only the diodes 23A and 23B but also semiconductor elements such as other switching elements may be employed. You may do it.
The rotating electrical machine M is not limited to being mounted on a vehicle, and can be suitably employed as a drive source for wind power generation, machine tools, and the like.

  While embodiments of the invention have been disclosed, it will be apparent to those skilled in the art that changes may be made without departing from the scope of the invention. All such modifications and equivalents are intended to be included in the following claims.

11, 11u-11w Armature coil (winding coil)
15 stator core 16 holding board 17 status lot 21, 21a1 to 21a6, 21b1 to 21b6 induction coil (winding coil)
22, 22a1 to 22a6, 22b1 to 22b6 Field coil (winding coil)
23A, 23B Diode (rectifier element)
25 Rotor core (core material)
26 Yoke 27 Rotor slot 29 Closed circuit 30 End plate 33 Circuit board 32 Case 100 Stator 200, 300 Rotor G Gap HF Spatial harmonic magnetic flux M Rotating electrical machine MF Magnetic flux RS Shaft (Rotating shaft)

Claims (5)

Two rotors that are driven to rotate about a rotation axis; and a stator in which the rotor faces both surfaces in the axial direction of the rotation axis,
A plurality of armature coils arranged around the rotation axis of the stator;
A plurality of induction coils and a plurality of field coils arranged around the rotation axis of each of the two rotors;
An axial gap type rotating electric machine comprising: a rectifying element that rectifies an induced current generated in the induction coil and supplies the rectified current to the field coil. The armature coil, the induction coil, and the field coil are wound around the axial direction of the rotating shaft,
The axial gap type rotating electrical machine according to claim 1, wherein the windings are equally arranged around the rotating shaft.   The axial gap type rotation according to claim 1 or 2, wherein the number of slots S used for winding of the induction coil and the field coil / the number of magnetic poles P for winding the armature coil is 2/3. Electric. The induction coil and the field coil are wound around a core material extending in a direction parallel to the rotation axis,
The induction coil is wound around a position of the core material close to the stator, and the field coil is wound around a position separated from the stator of the core material. An axial gap type rotating electrical machine according to claim 1.   5. The axial gap type rotating electrical machine according to claim 1, wherein the rectifying element is incorporated in a closed circuit including the induction coil and the field coil that rotate integrally with the rotor. 6. .

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