JP2009005572A - Magnetic inductor type synchronous rotating machine and automobile supercharger using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a magnetic inductor type synchronous rotating machine capable of enhancing motor efficiency by reducing a windage loss and wind noise at the time of high speed rotation. <P>SOLUTION: The machine is provided with first and second magnetic bodies 4, 5 where salient poles are disposed at an equiangular pitch in the circumferential direction at the circumference of cylindrical base sections 4a, 5a each having a rotation axis insertion hole at the position of an axial center and that are coaxially disposed by deviating the salient poles 4b, 5b by a half salient pole pitch in the circumferential direction and being spaced out at a predetermined distance in the axial direction, a division wall 6 that has a rotation axis insertion hole at the position of the axial center is prepared in a disk of a diameter bigger than those of the base sections 4a, 5a, and is coaxially interposed by closely contacting with the first and the second magnetic bodies 4, 5 at a gap therebetween, the rotation axis 2 that inserts the first and the second magnet bodies 4, 5 and the division wall 6 into each rotation axis insertion hole and fixes them therein, a multi-phase coil 11 that generates rotational torque around stator cores 9, 10 enclosing the first and the second magnet bodies 4, 5 and the first and the second magnet bodies 4, 5, and a field coil 12 that excites the salient poles 4b, 5b. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  TECHNICAL FIELD The present invention relates to a magnetic inductor type synchronous rotating machine and a supercharger for an automobile using the same, and particularly to applications that require ultra-high speed rotation exceeding 100,000 rpm where the rotor windage becomes serious. The present invention relates to a magnetic inductor type synchronous rotating machine and an automobile supercharger using the same.

  A conventional homopolar motor is mounted on a rotary shaft in series with a predetermined interval, and is arranged so as to surround each of the two rotors including the respective salient poles, And a stator having a torque generating drive coil for generating torque in the rotor, and a field magnetomotive force generating means arranged outside the stator and exciting the salient poles (for example, Patent Document 1). reference). Since this conventional homopolar motor has a configuration in which salient poles are excited by means of field magnetomotive force generating means to form magnetic poles, a simple-shaped iron core can be used and a member having a problem with centrifugal force such as a magnet can be used. It becomes unnecessary and can be applied to high-speed rotation.

JP-A-10-136622

  However, in the conventional homopolar motor, the salient poles extend in the axial direction of the rotor, so a considerable amount of windage loss occurs during high-speed rotation, and the motor efficiency is reduced and the rotor wind noise is reduced. There was a problem that became larger.

  The present invention has been made to solve such a problem, and a magnetic inductor type synchronous rotating machine capable of reducing the windage loss and wind noise during high-speed rotation and increasing the motor efficiency, and the same. It aims at obtaining the used supercharger for cars.

  In the magnetic inductor type synchronous rotating machine according to the present invention, the salient poles are arranged at an equiangular pitch in the circumferential direction on the outer circumference of the cylindrical base portion having the rotation shaft insertion hole at the axial center position. Discs having a larger diameter than the base portion, the first and second magnetic bodies being arranged coaxially with a half salient pole pitch shifted to each other and spaced apart by a predetermined distance in the axial direction, and a rotary shaft insertion hole at the axial center position And a partition wall closely and coaxially interposed between the first and second magnetic bodies, and the first and second magnetic bodies and the partition wall are inserted into the respective rotation shaft insertion holes. A stator having a rotating shaft to be fixed, a stator core surrounding each of the first and second magnetic bodies, and a torque generating drive coil for generating rotational torque in the first and second magnetic bodies, and the fixing For generating magnetomotive force of the field, which is arranged on the child and excites the salient pole. And yl are those with a.

  According to the present invention, the partition wall interposed between the first and second magnetic bodies is formed with a larger diameter than the bases of the first and second magnetic bodies. The airflow flowing from the first magnetic body to the second magnetic body due to the poles being shifted in the circumferential direction by the half salient pole pitch is blocked by the partition walls. Wind loss due to the airflow flowing in the axial direction is reduced, and motor efficiency is increased. Furthermore, wind noise caused by the airflow flowing in the axial direction is reduced, and wind noise is reduced.

Embodiment 1 FIG.
FIG. 1 is a partially broken perspective view showing the configuration of a magnetic inductor type synchronous rotating machine according to Embodiment 1 of the present invention, and FIG. 2 is applied to the magnetic inductor type synchronous rotating machine according to Embodiment 1 of the present invention. It is a perspective view which shows the structure of the rotor performed. In FIG. 1, for convenience, only one phase coil wound in a concentrated manner around a pair of teeth is shown.

  1 and 2, a magnetic inductor type synchronous rotating machine 1 generates torque in a rotor 3 fixed coaxially to a rotating shaft 2 and a stator core 8 disposed so as to surround the rotor 3. A stator 7 wound with a multiphase coil 11 as a drive coil, a field coil 12 as a field magnetomotive force generating coil, and the rotor 3, the stator 7 and the field coil 12. Case 13 is provided.

  The rotor 3 is produced by laminating and integrating a predetermined number of magnetic steel plates and the first and second magnetic bodies 4 and 5 produced by laminating and integrating a large number of magnetic steel plates formed in a predetermined shape. And a disk-shaped partition wall 6 in which an insertion hole (not shown) is formed at the center position. The first and second magnetic bodies 4 and 5 are formed in the same shape, and cylindrical base portions 4a and 5a having rotation shaft insertion holes 4c and 5c drilled at the axial center positions, and outer peripheral surfaces of the base portions 4a and 5a Is formed from four salient poles 4b and 5b that are provided radially outwardly and extend in the axial direction, and are provided at equiangular pitches in the circumferential direction. The first and second magnetic bodies 4 and 5 are arranged with a semi-saliency pitch shift in the circumferential direction, are arranged in close contact with each other via the partition wall 6, and the rotary shaft 2 inserted through the rotary shaft insertion holes. It is fixed and configured. The outer diameter of the partition 6 corresponds to the outer diameter of the first and second magnetic bodies 4 and 5 (outer diameter of the salient poles 4b and 5b).

  The stator core 8 includes first and second stator cores 9 and 10 that are manufactured by laminating and integrating a large number of magnetic steel plates formed in a predetermined shape. The first and second stator cores 9 and 10 are made in the same shape, and are projected radially inward from the inner peripheral surfaces of the cylindrical core backs 9a and 10a and the core backs 9a and 10a in the circumferential direction. And 6 teeth 9b and 10b provided at an equiangular pitch. The first and second stator cores 9 and 10 are disposed between the axial thickness separations of the partition wall 6 with the circumferential positions of the teeth 9b and 10b coincided with each other, and the first and second magnetic bodies 4 and 5, respectively. Go. In FIG. 1, only one phase coil wound in a concentrated manner around a pair of teeth 9b and 10b is shown. However, the multi-phase coil 11 is actually used for six pairs of teeth 9b and 10b. The three phases U, V, and W are sequentially repeated twice and wound into a concentrated winding.

  The field coil 12 is formed by winding a conductor wire in a cylindrical shape, and is interposed between the core backs 9 a and 10 a of the first and second stator cores 9 and 10. The rotary shaft 2 that integrally fixes the first and second magnetic bodies 4 and 5 and the partition wall 6 is supported by a bearing portion (not shown).

Next, the operation of the magnetic inductor type synchronous rotating machine 1 configured as described above will be described.
When the field coil 12 is energized, it flows from the salient pole 4b of the first magnetic body 4 to the first stator core 9 and then flows in the axial direction, as indicated by an arrow in FIG. A magnetic flux returning from 10 to the salient pole 5b of the second magnetic body 5 is formed. At this time, since the salient poles 4b and 5b of the first and second magnetic bodies 4 and 5 are shifted by a half salient pole pitch in the circumferential direction, when viewed from the axial direction, the magnetic flux is in the circumferential direction. It acts as if they were arranged alternately. Thus, the magnetic inductor type synchronous rotating machine 1 is a non-commutator motor, and magnetically operates in the same manner as an 8-pole 6-slot concentrated winding type permanent magnet rotating electrical machine. However, since the magnetic flux is generated by the field coil 12, the back electromotive force can be removed by stopping the energization to the field coil 12. This magnetic inductor type synchronous rotating machine 1 is also a field control type rotating electric machine.

In the magnetic inductor type synchronous rotating machine 1, the multiphase coil 11 is wound around the first and second stator cores 9 and 10 in a concentrated winding method, but the multiphase coil 11 is distributed winding. It may be wound around the first and second stator cores 9 and 10 in a manner.
In the magnetic inductor type synchronous rotating machine 1, the ratio of the number of field poles to the number of slots is 8: 6, that is, the pole slot ratio is 4: 3, but the pole slot ratio is limited to 4: 3. Instead, it may be 2: 3, for example.

Here, the effect obtained by interposing the partition wall 6 between the first and second magnetic bodies 4 and 5 will be described.
First, the windage loss in the case of using the rotor 20 as a comparative example in which the partition wall 6 is omitted will be described. As shown in FIG. 3, the rotor 20 has the first and second magnetic bodies 4, 5 arranged in close contact with each other in the axial direction with a half salient pole pitch shifted in the circumferential direction, and inserted into the axial center position thereof. It is configured to be fixed to the rotating shaft 2 formed. When the rotor 20 is rotated at a high speed, as indicated by an arrow in FIG. 4, the air current A flows in a vortex between the salient poles 4 b adjacent in the circumferential direction. Although not shown, the airflow A flows so as to wind a vortex between the salient poles 5b adjacent in the circumferential direction. At this time, since the salient poles 4b and 5b are shifted in the circumferential direction by a half salient pole pitch and exist in the axial direction, an airflow B flowing in the axial direction is generated as indicated by an arrow in FIG. In this type of rotating machine, the airflow B flowing in the axial direction becomes a windage loss. The windage loss is generally proportional to the third power of the rotation speed, and thus cannot be ignored in a rotating machine operated at high speed.

  In the rotor 3 having this structure, the partition wall 6 interposed between the first and second magnetic bodies 4 and 5 blocks the airflow B flowing in the axial direction, as shown in FIG. Thereby, since the wind loss resulting from the airflow B is reduced and the loss as a rotating machine is reduced, the motor efficiency is increased. Furthermore, wind noise is reduced and wind noise is reduced.

  Here, it is assumed that the outer diameter of the partition wall 6 is the same as the outer diameter of the first and second magnetic bodies 4 and 5 (outer diameter of the salient poles 4b and 5b). 6 does not necessarily have to coincide with the outer diameters of the salient poles 4b and 5b of the first and second magnetic bodies 4 and 5, and the outer diameter of the multiphase coil 11 wound around the stator core 8 It is only necessary to be smaller than the inner diameter and larger than the outer diameter of the base portions 4a and 5a of the first and second magnetic bodies 4 and 5.

Next, the effect of manufacturing the partition wall 6 with a magnetic material will be described.
In the conventional synchronous rotating electrical machine 21, as shown in FIG. 7, instead of the rotor 3, the first and second magnetic bodies 4, 5 are separated from each other in the axial direction and fixed to the rotating shaft 2. 22 is used. Therefore, when the field coil 12 is energized, as indicated by an arrow in FIG. 7, it flows from the salient poles 4b of the first magnetic body 4 to the first stator core 9, and then flows in the axial direction to be second fixed. A magnetic flux that flows from the core 10 to the second magnetic body 5, flows in the axial direction on the rotating shaft 2, and returns to the first magnetic body 4 is formed. As described above, when the conventional rotor 22 is used, the magnetic path returning from the second magnetic body 5 to the first magnetic body 4 is constituted only by the rotary shaft 2.

  In a high-speed rotating machine with a rotational speed exceeding 100,000 rpm, the diameter of the rotating shaft is limited to 6 to 8 mm due to the peripheral speed limit of the bearing portion. Therefore, when trying to obtain an output of about 1 Kw with a high-speed rotating machine whose rotational speed exceeds 100,000 rpm, the magnetic path cross-sectional area is narrow only with the rotating shaft whose diameter is limited to 6 to 8 mm, and magnetic saturation Therefore, a desired amount of magnetic flux cannot be secured.

  In the rotor 3 of this structure, since the partition wall 6 is made of a magnetic material, when the field coil 12 is energized, it flows from the salient pole 4b of the first magnetic material 4 to the first stator core 9, and thereafter A magnetic flux that flows in the axial direction, flows from the second stator core 10 to the second magnetic body 5, flows in the axial direction through the rotating shaft 2 and the partition wall 6, and returns to the first magnetic body 4 is formed. As described above, when the rotor 3 is used, the magnetic path returning from the second magnetic body 5 to the first magnetic body 4 is constituted by the rotating shaft 2 and the partition wall 6. Therefore, the magnetic path cross-sectional area returning from the second magnetic body 5 to the first magnetic body 4 is larger than that of the rotary shaft 2 alone, so that the cross-sectional integral of the base portions 4a and 5a is increased. The amount can be secured. Therefore, by adopting the rotor 3 having this structure, an output of about 1 Kw can be obtained even in a high-speed rotating machine whose rotational speed exceeds 100,000 rpm.

  Since the magnetic inductor type synchronous rotating machine 1 according to the first embodiment has reduced windage loss and can reduce loss as a rotating machine, the same electric power can be used as compared with the conventional magnetic inductor type synchronous rotating machine 21. Rotation is possible. Therefore, if this magnetic inductor type synchronous rotating machine 1 is applied to a rotating machine for an automobile supercharger that rotates at an ultra-high speed or a spindle motor that operates a spindle of a high-speed spindle machine tool, the rotating machine for an automotive supercharger is used. And higher speed spindle motor. The automobile supercharger is, for example, fixed to the turbine disposed in the exhaust system of the engine, the compressor disposed in the rotating shaft of the turbine, and coaxially secured to the rotating shaft. And a rotating machine. Since this rotating machine is required to rotate at an ultra-high speed, it is particularly effective to apply the magnetic inductor type synchronous rotating machine 1 of the present application that can realize an ultra-high speed.

  Next, the outer diameter of the partition wall 6 will be examined from a magnetic point of view. Here, the result of measuring the output (torque) by changing the outer diameter of the partition wall 6 is shown in FIG. In FIG. 8, the horizontal axis represents the relative value of the partition outer diameter with respect to the rotor outer diameter (the outer diameter of the salient poles of the first and second magnetic bodies), and the vertical axis represents the rotor outer diameter as the rotor outer diameter. The relative value of the torque with respect to the torque is shown. That is, when the relative value of the partition outer diameter is 100, the partition outer diameter matches the rotor outer diameter, and the relative torque value of 100 corresponds to the torque when the partition outer diameter is the rotor outer diameter. Means that. In FIG. 8, the solid line indicates the relationship between the relative value of the partition outer diameter and the relative value of the torque.

  From FIG. 8, when the outer diameter of the partition wall 6 is increased, the torque obtained is gradually increased. When the outer diameter of the partition wall 6 is around 92% of the rotor outer diameter, the maximum value is obtained, and the outer diameter of the partition wall 6 is further increased. It was found that the torque gradually decreased as it increased. This is because when the outer diameter of the partition wall 6 is reduced, the cross-sectional area of the magnetic path in the partition wall 6 is reduced, the desired amount of magnetic flux cannot be obtained, and the torque is reduced. On the other hand, the outer diameter of the partition wall 6 is the rotor outer diameter. When it becomes larger, the gap between the partition wall 6 and the stator core 8 becomes shorter than the gap length between the rotor outer diameter and the stator core 8, and the magnetic flux generated by the magnetic field generated by the field coil 12 is increased by the second stator. It is assumed that the magnetic flux that flows from the iron core 10 to the first stator iron core 9 via the partition wall 6 and does not contribute to this torque, that is, the leakage magnetic flux increases.

Here, the magnetic flux density B _s [T] of the partition is expressed by the formula (1).

Μ ₀ : vacuum permeability [H / m], AT: field ampere turn [AT], S _s : area of rotor magnetic pole [m ² ], l _g : gap between rotor and stator Length [m], S _r : cross-sectional area [m ² ] perpendicular to the axial direction of the partition wall.
Here, the magnetic flux density of the partition wall when the rotor outer diameter is 10.0 mm, the rotor magnetic pole angle is 30 deg, and the magnetic pole axial length is 12.5 mm is calculated and shown by the dotted line in FIG. Incidentally, mu ₀ and ^{4π × 10 -7 [H / m} ], the AT 1440 [AT], 0.55mm to _{l g, S s} and ^{10.0 × 10 -3 × π × {} 30 (deg) / 360 (Deg)} × 12.5 × 10 ⁻³ [m ² ].

FIG. 8 shows that the magnetic flux density increases as the outer diameter of the partition wall 6 decreases.
For example, when the outer diameter of the partition wall 6 is 8.35 mm, the magnetic flux density B _{s of the} partition wall is 1.703 [T]. In general, when the magnetic flux density exceeds 1.7 T, magnetic saturation occurs and it is difficult to obtain torque. Therefore, in order to avoid magnetic saturation in the partition wall 6 and ensure a large torque, the outer diameter of the partition wall 6 is preferably 83.5% or more of the rotor outer diameter. Further, when the outer diameter of the partition wall 6 is 83.5% of the rotor outer diameter, the same torque as that obtained when the outer diameter of the partition wall 6 is the rotor outer diameter can be obtained.
Further, from FIG. 8, when the outer diameter of the partition wall 6 is made larger than the outer diameter of the rotor, the torque is reduced.
From this point of view, it is preferable from the magnetic point of view that the outer diameter of the partition wall 6 is 100% or less and 83.5% or more of the rotor outer diameter.

  In the first embodiment, the partition wall 6 is made of a magnetic material. However, the partition wall 6 is not necessarily made of a magnetic material, and a metal material such as stainless steel, aluminum, or copper, or a resin material such as epoxy. You may produce with nonmagnetic materials, such as. Even in this case, the effect of reducing windage loss and wind noise can be obtained.

In the first embodiment, the first and second magnetic bodies 4 and 5 are formed by laminating and integrating magnetic steel sheets. However, the first and second magnetic bodies are limited to a laminated body of magnetic steel sheets. Instead, it may be made of a lump of low carbon steel such as S10C.
In the first embodiment, the partition walls 6 are formed by laminating and integrating magnetic steel plates. However, the partition walls are not limited to a laminate of magnetic steel plates. If the partition 6 is a magnetic body, it may be made of a lump of low carbon steel such as S10C. In this case, the first and second magnetic bodies 4 and 5 and the partition 6 may be integrally formed using a low-carbon steel lump. Further, if the partition wall 6 is a non-magnetic material, it may be made of a lump such as a metal material such as stainless steel, aluminum or copper, or a resin material such as epoxy.

Embodiment 2. FIG.
FIG. 9 is a perspective view showing a rotor structure applied to a magnetic inductor type synchronous rotating machine according to Embodiment 2 of the present invention.
In FIG. 9, in the rotor 3A, the disk-shaped ring body 14 having the same outer diameter as the partition wall 6 and having the rotation shaft insertion hole 14a drilled at the axial center position is formed by the first and second magnetic bodies 4, The shaft 5 is closely and coaxially arranged on both sides in the axial direction, and is fixed to the rotating shaft 2 inserted through the rotating shaft insertion hole 14a. Other configurations are the same as those in the first embodiment.

  When the rotor 3 of the first embodiment is rotated at a high speed, as shown in FIG. 6, in addition to the air current A that creates a vortex between the salient poles 4b adjacent in the circumferential direction, The airflow C flows between the salient poles 4b, flows toward the partition wall 6, and then is folded back to flow outwardly between the salient poles 4b in the axial direction. Although not shown, air currents A and C are also generated between the salient poles 5b adjacent in the circumferential direction.

  In the rotor 3A according to the second embodiment, the pair of ring bodies 14 are arranged in close contact with both axial sides of the first and second magnetic bodies 4 and 5, so that the salient poles 4b, Generation of the airflow C that flows between 5b and then flows axially outward from between the salient poles 4b and 5b is prevented. Thereby, the wind loss is reduced by that amount, and the loss as a rotating machine is reduced, so that the motor efficiency is further increased. Here, the ring body 14 may be made of either a magnetic material or a non-magnetic material. If the ring body 14 is made of the same material as the partition wall 6, the material cost can be reduced.

  In the second embodiment, the ring body 14 has an outer diameter equivalent to that of the partition wall 6. However, the outer diameter of the ring body 14 does not necessarily need to coincide with the outer diameter of the partition wall 6. It is only necessary to be smaller than the inner diameter of the multiphase coil 11 wound around the stator core 8 and larger than the outer diameters of the base portions 4 a and 5 a of the first and second magnetic bodies 4 and 5.

Embodiment 3 FIG.
In the third embodiment, as shown in FIG. 10, the balancing portion 15 of the rotor 3 </ b> B is formed by processing a part of the partition wall 6. Other configurations are the same as those in the first embodiment.
In the rotor 3B configured as described above, the balancing of the rotor 3B is performed by the partition wall 6 that does not affect the magnetic path, so compared to the case where the balancing is performed at the end of the rotor, which is conventionally performed. Deterioration of magnetic characteristics due to balancing can be suppressed.

Embodiment 4 FIG.
In the fourth embodiment, as shown in FIG. 11, the balancing portion of the rotor 3 </ b> C is formed in the partition wall 6 and the ring body 14. Other configurations are the same as those in the second embodiment.
In the rotor 3C configured as described above, since the balancing of the rotor 3C can be performed at a number of locations without affecting the magnetic path, in addition to the effects of the third embodiment, higher order is included. Mechanical resonance can be avoided.

Embodiment 5 FIG.
FIG. 12 is an exploded perspective view showing a rotor applied to the magnetic inductor type synchronous rotating machine according to the fifth embodiment of the present invention.
In FIG. 12, the salient pole positioning member 16 has a disk-shaped partition wall 17 having a rotation shaft insertion hole 17a at the axial center position, and projects from both end surfaces of the partition wall 17, and the first and second magnetic bodies 4, 5 And a protrusion 18 for positioning the first and second magnetic bodies 4 and 5 in a state shifted by a half salient pole pitch in the circumferential direction by contacting both side surfaces of the salient poles 4b and 5b in the circumferential direction. Other configurations are the same as those in the first embodiment.

  In the fifth embodiment, the first magnetic body 4 is assembled to the salient pole positioning member 16 from one side in the axial direction, and the second magnetic body 5 is assembled to the salient pole positioning member 16 from the other side in the axial direction. At this time, both side surfaces of the salient pole 4b in the circumferential direction are in close contact with opposite side surfaces of the pair of projecting portions 18 adjacent to each other in the circumferential direction, and rotation of the first magnetic body 4 around the axis with respect to the salient pole positioning member 16 is prevented. The Similarly, both side surfaces in the circumferential direction of the salient pole 5b are in close contact with opposite side surfaces of the pair of protrusions 18 adjacent in the circumferential direction, and rotation of the second magnetic body 5 around the axis with respect to the salient pole positioning member 16 is prevented. The As a result, the first and second magnetic bodies 4 and 5 are assembled to the salient pole positioning member 16 in a state where the semimagnetic pole pitch is shifted in the circumferential direction. Then, the first and second magnetic bodies 4 and 5 and the salient pole positioning member 16 are fixed to the rotary shaft 2 inserted through the rotary shaft insertion holes 4c, 17a and 5c to constitute the rotor 3D.

  According to the fifth embodiment, the salient poles 4b and 5b are arranged at a half pole pitch in the circumferential direction simply by assembling the first and second magnetic bodies 4 and 5 to the salient pole positioning member 16 from both axial sides. The first and second magnetic bodies 4 and 5 can be assembled in a state. Further, since the rotation of the first and second magnetic bodies 4 and 5 around the axial center of the salient pole positioning member 16 is prevented, the first and second magnetic bodies 4 and 5 in the process of inserting the rotating shaft 2 are prevented. There is no misalignment in the circumferential direction. Therefore, the rotor 3D in which the circumferential positions of the salient poles 4b and 5b are positioned with high accuracy can be easily assembled without using a dedicated assembly jig. In this way, the salient poles 4b and 5b are shifted from each other by a half magnetic pole pitch and arranged at an equiangular pitch in the circumferential direction, whereby a desired torque can be obtained.

Embodiment 6 FIG.
FIG. 13 is a sectional view showing the configuration of a magnetic inductor type synchronous rotating machine according to Embodiment 6 of the present invention.
In FIG. 13, in the rotor 3E, the axial lengths of the first and second magnetic bodies 4A and 5A are made longer than the first and second magnetic bodies 4 and 5 and the partition 6 in the first embodiment, and the partition The axial thickness of 6A is reduced accordingly. Thereby, the outer diameter of the partition wall 6A is larger than the outer diameters of the first and second magnetic bodies 4A and 5A, and the gap d between the partition wall 6A and the first and second stator cores 9 and 10 is the first and second magnetic bodies 4A and 5A. second magnetic body 4A, is constructed longer than the gap length _{l g} between 5A and the first and second stator core 9 and 10.
Other configurations are the same as those in the first embodiment.

In the sixth embodiment, the gap d between the partition wall 6A and the first and second stator cores 9 and 10 is defined as the first and second magnetic bodies 4A and 5A and the first and second stator cores 9 and 10. It is configured longer than the gap length l _g between. Therefore, the magnetic resistance between the second stator core 10 and the partition wall 6A is larger than the magnetic resistance between the second stator core 10 and the second magnetic body 5A. Similarly, the magnetic resistance between the first stator core 9 and the partition wall 6A is larger than the magnetic resistance between the first stator core 9 and the first magnetic body 4A. Thereby, the magnetic flux generated by the magnetic field generated by the field coil 12 flows from the second stator core 10 through the gap to the second magnetic body 5A, and then flows to the first magnetic body 4A via the partition 6A and the rotating shaft 2. Then, it flows to the first stator core 9 through the gap.

As described above, according to the sixth embodiment, the gap d between the partition wall 6A and the first and second stator cores 9 and 10 is equal to the first and second magnetic bodies 4A and 5A and the first and second magnetic bodies 4A and 5A. which is configured longer than the gap length l _g between the stator core 9 and 10, the outer diameter of the partition walls 6A first and second magnetic bodies 4A, due to larger than the outer diameter of 5A The generation of the flow of magnetic flux that does not contribute to torque flowing from the two stator cores 10 to the first stator core 9 via the partition walls 6A can be suppressed. Therefore, even if the outer diameter of the partition wall 6A is larger than the outer diameters of the first and second magnetic bodies 4A and 5A, the leakage magnetic flux that does not contribute to the torque is reduced, and a large torque can be secured.

Here, the partition wall 6A has a gap d between the partition wall 6A and the first and second stator cores 9 and 10 and the first and second magnetic bodies 4A and 5A and the first and second stator cores 9 and 10. if longer construction than the gap length l _g between the first and second magnetic bodies 4A, larger than the outer diameter of 5A, and may be the outer diameter smaller than the inner diameter of the multi-phase coil 11.
Moreover, in the said Embodiment 6, although the rotor 3 in the said Embodiment 1 is demonstrated as replacing the structure of the rotor 3E, this rotor structure is made into the rotor in the said Embodiment 2-5. Even if applied, the same effect can be obtained.

It is a partially broken perspective view which shows the structure of the magnetic inductor type synchronous rotating machine which concerns on Embodiment 1 of this invention. It is a perspective view which shows the structure of the rotor applied to the magnetic inductor type synchronous rotating machine which concerns on Embodiment 1 of this invention. It is a perspective view which shows the structure of the rotor as a comparative example. FIG. 4 is a cross-sectional view taken along arrow IV-IV in FIG. 3. It is a perspective view explaining the flow of the airflow in the rotor as a comparative example. It is a perspective view explaining the flow of the airflow in the rotor applied to the magnetic inductor type synchronous rotating machine which concerns on Embodiment 1 of this invention. It is sectional drawing which shows the structure of the conventional magnetic inductor type synchronous rotating machine. It is a figure which shows the relationship between the partition outer diameter and torque in the magnetic inductor type synchronous rotating machine of this invention. It is a perspective view which shows the rotor applied to the magnetic inductor type synchronous rotary machine which concerns on Embodiment 2 of this invention. It is a perspective view which shows the rotor applied to the magnetic inductor type synchronous rotating machine which concerns on Embodiment 3 of this invention. It is a perspective view which shows the rotor applied to the magnetic inductor type synchronous rotary machine which concerns on Embodiment 4 of this invention. It is a disassembled perspective view which shows the rotor applied to the magnetic inductor type synchronous rotating machine which concerns on Embodiment 5 of this invention. It is sectional drawing which shows the structure of the magnetic inductor type synchronous rotary machine which concerns on Embodiment 6 of this invention.

Explanation of symbols

  2 Rotating shaft, 3, 3A, 3B, 3C, 3D, 3E Rotor, 4, 4A First magnetic body, 4a base, 4b Salient pole, 4c Rotating shaft insertion hole, 5, 5A Second magnetic body, 5a base, 5b Salient pole, 5c Rotating shaft insertion hole, 6 Bulkhead, 7 Stator, 8 Stator core, 9 First stator core, 10 Second stator core, 11 Multi-phase coil (torque generating drive coil), 12 fields Magnetic coil (field magnetomotive force generating coil), 14 ring body, 14a rotating shaft insertion hole, 15 balancing portion, 16 salient pole positioning member, 17 partition, 17a rotating shaft insertion hole, 18 protrusion.

Claims (8)

Respective salient poles are arranged on the outer periphery of a cylindrical base portion having a rotation shaft insertion hole at the axial center position at an equiangular pitch in the circumferential direction, the salient poles are shifted in the circumferential direction by a half salient pole pitch, and in the axial direction First and second magnetic bodies disposed coaxially at a predetermined interval;
A partition wall having a rotation shaft insertion hole at the axial center position, made in a disk shape larger in diameter than the base, and closely and coaxially interposed between the first and second magnetic bodies;
A rotation shaft that inserts and fixes the first and second magnetic bodies and the partition wall into the respective rotation shaft insertion holes;
A stator core having a stator core surrounding each of the first and second magnetic bodies and a torque generating drive coil for generating a rotational torque in the first and second magnetic bodies;
A magnetic inductor type synchronous rotating machine, comprising: a field magnetomotive force generating coil disposed on the stator and exciting the salient pole.   Each has a rotation shaft insertion hole at the axial center position, is formed in a disk shape larger in diameter than the base, and is placed in close contact with the end surfaces of the first and second magnetic bodies opposite to the partition walls, The magnetic inductor type synchronous rotating machine according to claim 1, further comprising a pair of ring bodies fixed coaxially to the rotating shaft inserted through the shaft insertion hole.   The magnetic inductor type synchronous rotating machine according to claim 1 or 2, wherein balancing is applied to the partition wall.   The projections for positioning the circumferential positions of the first and second magnetic bodies in close contact with both circumferential side surfaces of the salient poles are projected from both axial end surfaces of the partition wall. The magnetic inductor type synchronous rotating machine according to any one of claims 1 to 3.   5. The magnetic inductor type synchronous rotating machine according to claim 1, wherein the partition wall is made of a magnetic material.   6. The magnetic inductor type synchronous rotating machine according to claim 5, wherein the outer diameter of the partition wall is 83.5% to 100% of the outer diameter of the salient pole.   The outer diameter of the partition wall is larger than the outer diameter of the salient pole and smaller than the inner diameter of the torque generating drive coil, and the gap between the partition wall and the stator core is the salient pole and stator. 6. The magnetic inductor type synchronous rotating machine according to claim 5, wherein the magnetic inductor type synchronous rotating machine is larger than a gap length between the core and the iron core.   A turbocharger for an automobile, wherein the turbine is driven to rotate using the magnetic inductor type synchronous rotating machine according to any one of claims 1 to 7.

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