WO2015159334A1

WO2015159334A1 - Rotating electrical machine

Info

Publication number: WO2015159334A1
Application number: PCT/JP2014/060589
Authority: WO
Inventors: 野中　剛; 荘平大賀; 隆明石井
Original assignee: 株式会社安川電機
Priority date: 2014-04-14
Filing date: 2014-04-14
Publication date: 2015-10-22

Abstract

[Problem] To make it possible to perform driving in an optimum operation state by means of using a control motor in a mechanism that changes a field magnetic flux. [Solution] A variable field magnet rotating electrical machine (1) that changes a field magnetic flux has: an outer circumferential-side rotor (20) that is provided with a plurality of first permanent magnets (21), which are disposed in the circumferential direction; an inner circumferential-side rotor (30), which is coaxially disposed on the inner side of the outer circumferential-side rotor (20), and which is provided with a second permanent magnet (31); and a rotating mechanism (50), which is configured so as to relatively rotate the outer circumferential-side rotor (20) and the inner circumferential-side rotor (30) by means of a control motor (53).

Description

Rotating electric machine

The disclosed embodiment relates to a rotating electrical machine.

Patent Document 1 describes an electric motor including a rotor composed of an inner circumferential rotor and an outer circumferential rotor whose mutual rotation axes are arranged coaxially and whose relative phases can be changed.

JP 2008-289212 A

In the above prior art, hydraulic pressure is used for the rotation mechanism that changes the relative phase between the inner circumferential rotor and the outer circumferential rotor. Since the hydraulic pressure changes depending on the load torque and the rotational speed, it is difficult to accurately control the field magnetic flux in every situation, and it is difficult to drive the rotating electrical machine in an optimum operating situation.

The present invention has been made in view of such a problem, and an object of the present invention is to provide a rotating electrical machine that can be driven in an optimal driving situation by using a control motor for a mechanism that changes a field magnetic flux. And

In order to solve the above problems, according to one aspect of the present invention, a variable field type rotating electrical machine that changes a field magnetic flux, and an outer periphery that includes a plurality of first permanent magnets arranged in a circumferential direction. A side rotor, an inner peripheral rotor that is coaxially disposed inside the outer peripheral rotor and includes a second permanent magnet, and the outer peripheral rotor and the inner peripheral rotor are relatively moved by a control motor. And a rotating electrical machine having a rotating mechanism configured to be rotated.

According to another aspect of the present invention, there is provided a variable field type rotating electrical machine that changes a field magnetic flux, and an outer peripheral rotor including a plurality of first permanent magnets arranged in the circumferential direction; An inner circumferential rotor that is coaxially disposed inside the outer circumferential rotor and includes a second permanent magnet, and means for electrically rotating the outer circumferential rotor and the inner circumferential rotor relative to each other. , A rotating electrical machine having the above is applied.

According to the present invention, the rotating electric machine can be driven in an optimal operating condition by using the control motor for the mechanism for changing the field magnetic flux.

It is an axial sectional view of the rotating electrical machine according to the first embodiment. It is a cross-sectional view of the rotating electrical machine according to the first embodiment. It is an axial direction sectional view showing the rotor and rotation mechanism of a rotary electric machine. It is a perspective view showing the structure of a shaft, a slider, and an inner peripheral side rotor. It is explanatory drawing showing the partial structure of a rotation mechanism. It is explanatory drawing showing the positional relationship of the inner peripheral side rotor with respect to the outer peripheral side rotor in the case of obtaining a weak field magnetic flux. It is explanatory drawing showing the positional relationship of the inner peripheral side rotor with respect to the outer peripheral side rotor in the case of obtaining the field magnetic flux of medium intensity | strength. It is explanatory drawing showing the positional relationship of the inner peripheral side rotor with respect to the outer peripheral side rotor in the case of obtaining a strong field magnetic flux. It is the graph which showed the relationship between the torque and efficiency of a rotary electric machine by comparing with embodiment and Comparative Examples 1 and 2. FIG. It is an axial sectional view of the rotating electrical machine according to the second embodiment. It is a cross-sectional view of the rotating electrical machine according to the second embodiment. It is a perspective view showing the structure of a shaft, a slider, and a boss | hub. It is explanatory drawing showing the positional relationship of the inner peripheral side rotor with respect to the outer peripheral side rotor in the case of obtaining a weak field magnetic flux. It is explanatory drawing showing the positional relationship of the inner peripheral side rotor with respect to the outer peripheral side rotor in the case of obtaining the field magnetic flux of medium intensity | strength. It is explanatory drawing showing the positional relationship of the inner peripheral side rotor with respect to the outer peripheral side rotor in the case of obtaining a strong field magnetic flux. It is explanatory drawing showing the positional relationship of the inner peripheral side rotor with respect to the outer peripheral side rotor when obtaining a weak field magnetic flux in 3rd Embodiment. It is explanatory drawing showing the positional relationship of the inner peripheral side rotor with respect to the outer peripheral side rotor when obtaining a strong field magnetic flux in 3rd Embodiment.

Hereinafter, embodiments will be described with reference to the drawings. In the following, for convenience of description of the configuration of the rotating electrical machine and the like, directions such as up and down, left and right are used as appropriate, but the positional relationship of the components of the rotating electrical machine and the like is not limited.

<1. First Embodiment>
First, the configuration of the rotating electrical machine according to the first embodiment will be described with reference to FIGS. 1 to 5.

(1-1. Schematic configuration of rotating electric machine)
The rotating electrical machine 1 according to the present embodiment is a variable field type rotating electrical machine capable of changing a field magnetic flux. As shown in FIGS. 1 and 2, the rotating electrical machine 1 includes a stator 10, an outer peripheral rotor 20 having a first permanent magnet 21 disposed inside the stator 10, and a second permanent magnet 31. A circumferential rotor 30 and a rotation mechanism 50 having a control motor 53 (see FIG. 5 described later) for relatively rotating the outer circumferential rotor 20 and the inner circumferential rotor 30 are provided. Such a variable field type rotating electrical machine 1 can be suitably used for, for example, a vehicle driving motor or a generator.

Rotating electrical machine 1 includes a hollow shaft 2. The shaft 2 is connected to a load side bracket 3 on one axial side (right side in FIG. 1) and a counter load side bracket 4 on the other axial side (left side in FIG. 1) via a load side bearing 5 and an anti load side bearing 6, respectively. And is supported rotatably. A cylindrical frame 7 is integrally provided on the non-load side bracket 4. The anti-load side bracket 4 and the frame 7 may be separated. The anti-load side bracket 4 and the frame 7 are fixed to the load side bracket 3 by frame fastening bolts 8 inserted from the anti-load side.

In this specification, “load side” refers to the direction in which the shaft 2 protrudes from the rotating electrical machine 1 (right side in FIG. 1), and “anti-load side” refers to the direction opposite to the load side, that is, the rotating electrical machine 1. The direction (left side in FIG. 1) in which the rotation mechanism 50 is disposed is indicated.

(1-2. Structure of stator)
The stator 10 includes a plurality of (in this example, 12) stator cores 11 that are annularly arranged on the inner peripheral side of the frame 7, and stator windings 12 that are attached to the stator cores 11. Each stator core 11 is fixed to the load side bracket 3 by a bolt 13.

(1-3. Configuration of outer rotor)
The outer circumferential rotor 20 includes an outer circumferential rotor core 22 disposed with a magnetic gap between the stator 10 and a plurality (ten in this example) of the first rotor core 22 provided on the outer circumferential rotor core 22. And a permanent magnet 21. The outer rotor core 22 includes a plurality of (in this example, 10) magnet housing parts 23 (an example of permanent magnet housing parts) that penetrate in the axial direction in a radial direction along the circumferential direction. The inner peripheral side is open. The outer rotor core 22 has a concave connecting portion 24 that is recessed in the radial direction on the outer peripheral side of each magnet housing portion 23. The plurality of first permanent magnets 21 are housed in the magnet housing portion 23 and are arranged radially on the outer circumferential rotor core 22. In the plurality of first permanent magnets 21, the magnetic poles facing each other between the two adjacent permanent magnets 21 are the same N poles or S poles, and the N poles and the S poles are alternately arranged in the circumferential direction. It arrange | positions so that it may be repeated, and the magnetic pole part 25 of N pole and S pole is formed in the outer peripheral part of the outer peripheral side rotor core 22 by turns in the circumferential direction.

As shown in FIGS. 3 and 4, the shaft 2 has a large-diameter portion 2a formed with a through hole 27a through which the first bolt 17 passes in the axial direction. Further, as shown in FIGS. 1 and 3, the load-side side plate 15 and the anti-load-side side plate 16 are arranged on both sides in the axial direction of the outer peripheral side rotor 20 and the inner peripheral side rotor 30. The two

side plates

15 and 16 hold the outer peripheral rotor 20 and play a role of restricting axial movement by contacting (sliding) with one axial side of the inner peripheral rotor 30. Specifically, the two

side plates

15 and 16 are fixed at the outer peripheral side by the outer peripheral rotor 20 and the second bolt 18, and at the inner peripheral side by the large-diameter portion 2 a of the shaft 2 and the first bolt 17. Yes. The side plate 15 on the load side is provided with

screw holes

15a and 15b into which the shaft portions of the first bolt 17 and the second bolt 18 are screwed. The side plate 16 on the side opposite to the load is provided with a storage groove 16a (an example of a recess) that prevents the head 18a of the second bolt 18 from being exposed. As shown in FIG. 2, the outer peripheral rotor core 22 is fixed to the

side plates

15 and 16 by two second bolts 18 for each magnetic pole portion 25 of one pole.

(1-4. Configuration of the inner rotor)
The inner circumferential rotor 30 is disposed so as to be substantially coaxial inside the outer circumferential rotor 20, and is disposed in a cylindrical shape on the outer circumference of the inner circumferential rotor core 29 and the inner circumferential rotor core 29. The second permanent magnet 31 is provided. The second permanent magnet 31 is a cylindrical permanent magnet in which N poles and S poles having the same number of poles as the outer rotor 20 are alternately magnetized on the outer peripheral surface. The second permanent magnet 31 may be composed of a plurality of permanent magnets divided into the same number as the number of magnetic poles of the outer circumferential rotor 20, or may be a single cylindrical permanent magnet. For convenience of explanation, a case where a single cylindrical permanent magnet is used will be described as an example, as shown in FIGS. The inner circumferential side rotor 30 has an axial dimension substantially equal to that of the outer circumferential side rotor 20 and is disposed between the two

side plates

15 and 16. When the axial thrust is applied, the inner circumferential rotor 30 is restricted from moving in the axial direction while sliding with one of the two

side plates

15 and 16 through the grease. As shown in FIG. 3, O-rings 33 are mounted on both axial sides of the inner circumferential rotor 30 to prevent the filled grease from scattering to the outer circumferential rotor 20 and the like.

(1-5. Configuration of rotating mechanism)
The rotation mechanism 50 rotates the inner rotor 30 relative to the outer rotor 20. As shown in FIGS. 3 and 4, the rotation mechanism 50 includes a cylindrical slider 34 that is attached to the large-diameter portion 2 a of the shaft 2. On the outer peripheral surface of the large-diameter portion 2a of the shaft 2, pin through holes 27c through which both ends of the pins 28 provided in the slider 34 penetrate and a plurality of spline portions 27b along the axial direction are formed. The through hole 27a for the first bolt 17 is formed between the spline portions 27b. The pin through hole 27c is provided in the shape of a long hole from the substantially central portion in the axial direction of the large diameter portion 2a to the vicinity of the end portion on the one axial side (obliquely upper right side in FIG. 4).

In this example, the slider 34 has an axial length that is substantially half of the large-diameter portion 2a of the shaft 2. A plurality of spline portions 34a along the axial direction are formed on the inner peripheral surface of the slider 34, and the pins 28 are fixedly penetrated in the radial direction. The slider 34 attached to the large-diameter portion 2a of the shaft 2 is movable in the axial direction while the rotational operation is restricted by the spline portion 34a engaging the spline portion 27b of the large-diameter portion 2a. At this time, the movable range of the slider 34 is restricted by the pin 28 and the pin through hole 27c, and is movable in the axial direction within the range of the axial dimension of the large diameter portion 2a of the shaft 2. On the outer peripheral surface of the slider 34, a torsion spline portion 34b inclined in the circumferential direction is formed.

The inner circumferential side rotor core 29 has an axial length slightly longer than the large diameter portion 2 a of the shaft 2. A torsion spline portion 31 a that engages with the torsion spline portion 34 b of the slider 34 is formed on the inner peripheral surface of the inner rotor core 29. The inner circumferential rotor core 29 attached to the slider 34 has a predetermined amount in the circumferential direction due to a predetermined amount of movement in the axial direction of the slider 34 when the torsion spline portion 31a engages the torsion spline portion 34b of the slider 34. Rotate.

As shown in FIG. 3, a pin holder 36 that can move in the axial direction together with the pin 28 is installed in the large-diameter portion 2 a of the shaft 2. The pin holder 36 is attached to the distal end portion of the feed male screw 41 of the rotation mechanism 50 via two movable bearings 37. The feed male screw 41 is installed so that the rotation of the shaft 2 is blocked by the movable bearing 37. The movable bearing 37 is, for example, an angular bearing, and the two movable bearings 37 support the axial force acting between the feed male screw 41 and the pin holder 36 by being arranged so that the axial support directions are opposed to each other. Is possible. The movable bearing 37 is held by a bearing holder 38 fixed to the front end portion of the feed male screw 41 by a bolt 39. The base end portion of the feed male screw 41 is engaged with a feed female screw 44 protruding from an annular flange 43 (see FIG. 1). The flange portion 43 is disposed so as to cover the end portion on the opposite side of the shaft 2 and is fixed to the opposite load side bracket 4. Two fixed bearings 45 are provided between the feed female screw 44 and the shaft 2, and the feed female screw 44 is installed so that the rotation of the shaft 2 is blocked by the fixed bearing 45. The fixed bearing 45 is fixed to the feed female screw 44 by a nut 46. The fixed bearing 45 is, for example, an angular bearing, and the two fixed bearings 45 are arranged so that the axial support directions face each other, thereby supporting the axial force acting between the feed female screw 44 and the shaft 2. Is possible.

The feed male screw 41 has a polygonal (for example, hexagonal) hole 41a that opens to the anti-load side. As shown in FIGS. 3 and 5, the rotating mechanism 50 includes a wheel gear 51 having a polygonal (for example, hexagonal) shaft portion 51 a inserted into the hole 41 a of the feed male screw 41, and a worm meshing with the wheel gear 51. A shaft 52 and a control motor 53 having the worm shaft 52 attached to the output shaft are provided. As shown in FIG. 1, the wheel gear 51 is rotatably supported on the feed female screw 44 by a bearing 47. The control motor 53 is installed in the rotating electrical machine 1 by being disposed between the cover body 55 attached to the other side in the axial direction of the anti-load side bracket 4 and the anti-load side bracket 4.

Rotation mechanism 50 operates as follows. That is, when the worm shaft 52 is driven by the control motor 53, the wheel gear 51 rotates, and the shaft portion 51a of the wheel gear 51 rotates the feed male screw 41. Since the feed male screw 41 meshes with the feed female screw 44, the feed male screw 41 moves in the axial direction by rotation, and the pin holder 36 attached to the tip end portion of the feed male screw 41 by blocking the rotation by the movable bearing 37 moves in the axial direction. As the pin holder 36 moves, the pin 28 moves in the axial direction, and the slider 34 coupled to the pin 28 moves in the axial direction. As the slider 34 moves in the axial direction, the inner circumferential rotor 30 splined to the outer periphery of the slider 34 by the torsion spline portion 31a in the twist direction rotates in the circumferential direction. Accordingly, the rotational position of the second permanent magnet 31 on the outer peripheral surface of the inner peripheral rotor 30 in the circumferential direction changes with respect to the first permanent magnet 21 of the outer peripheral rotor 20. The feed male screw 41 and the feed female screw 44 correspond to an example of a feed screw mechanism.

(1-6. Changes in field magnetic flux)
Next, changes in the field magnetic flux will be described with reference to FIGS. FIG. 6 shows the positional relationship of the inner circumferential rotor with respect to the outer circumferential rotor when a weak field state is obtained. In this state, as shown in FIG. 6, the inner rotor 30 has the S pole of the second permanent magnet 31 relative to the N pole magnetic pole portion 25 by the two first permanent magnets 21 of the outer rotor 20. It is in the position to do. In this case, a part of the magnetic field flux emitted from the first permanent magnet 21 of the outer peripheral rotor 20 is short-circuited to the inner peripheral side by the magnetic flux q2 of the second permanent magnet 31, so that the outer rotor 20 The field magnetic flux q1 (gap magnetic flux) from the N pole toward the outer peripheral side can be weakened.

In the strong field state, it can be operated with high torque and high efficiency, but the efficiency is poor in the low torque state due to the large iron loss. Therefore, for example, by setting the above weak field state in a low torque state, it is possible to operate with high efficiency.

FIG. 7 shows the positional relationship of the inner circumferential rotor with respect to the outer circumferential rotor when a medium strength field state is obtained. In this state, as shown in FIG. 7, the inner rotor 30 has a position where the N pole and S pole of the second permanent magnet 31 substantially coincide with the position of the first permanent magnet 21 of the outer rotor 20 ( In other words, the intermediate position between the north pole and the south pole of the second permanent magnet 31 is at a position facing the magnetic pole portion 25 of the outer rotor 20. In this case, with respect to the second permanent magnet 31, only the magnetic flux q2 from the N pole to the S pole is generated, and the magnetic flux of the first permanent magnet 21 is not drawn to the inner peripheral side. That is, the gap magnetic flux density of the field magnetic flux q1 from the N pole of the outer rotor 20 toward the outer peripheral side is increased as compared with the case shown in FIG. 6 because the magnetic flux of the first permanent magnet 21 is not short-circuited to the inner peripheral side. be able to.

For example, when the load torque is larger than in the case of FIG. 6, the control motor 53 is driven so as to obtain an optimum gap magnetic flux density, and the relative angle between the outer circumferential rotor 20 and the inner circumferential rotor 30 is increased. As a result, the maximum efficiency can be obtained.

FIG. 8 shows the positional relationship of the inner rotor with respect to the outer rotor when a strong field state is obtained. In this state, as shown in FIG. 8, the inner rotor 30 has the N pole of the second permanent magnet 31 relative to the N pole magnetic pole portion 25 by the two first permanent magnets 21 of the outer rotor 20. It is in the position to do. In this case, since the magnetic flux q2 from the N pole of the second permanent magnet 31 of the inner peripheral rotor 30 toward the outer peripheral side is added to the magnetic flux from the N pole of the first permanent magnet 21 toward the outer peripheral side, the outer peripheral rotor 20 The gap magnetic flux density of the field magnetic flux q1 from the N pole toward the outer peripheral side is maximized.

In this state, not only can a large torque be generated, but also the torque constant increases, and the current value decreases and the copper loss can be reduced more than the increase in iron loss, so that high efficiency can be obtained.

(1-7. Relationship between torque and efficiency of rotating electrical machines)
FIG. 9 is a graph showing the relationship between the torque and efficiency of the rotating electrical machine in this embodiment and Comparative Examples 1 and 2. Comparative Example 1 is a case where a rotating electrical machine in which the rotor is fixed in a relatively strong field state is operated, and can be operated with high efficiency in a high torque state. However, since the iron loss is large, the efficiency is low in a low torque state. It has become. Comparative Example 2 is a case where a rotating electric machine in which the rotor is fixed in a relatively weak field state is operated, and can be operated with high efficiency in a low torque state. However, since the magnetic force is small, a large torque cannot be produced. On the other hand, in the present embodiment, by changing the position of the inner rotor 30 with respect to the outer rotor 20, the field of the rotor (the outer rotor 20 and the inner rotor 30) according to the load torque. Since the magnetic flux can be increased or decreased, it is possible to operate with high efficiency from a low torque state to a high torque state.

(1-8. Effects of First Embodiment)
As described above, the rotating electrical machine 1 according to the first embodiment is coaxial with the outer peripheral rotor 20 having the plurality of first permanent magnets 21 arranged in the circumferential direction and the inner periphery of the outer peripheral rotor 20. The rotor 30 is arranged and has an inner peripheral rotor 30 provided with a second permanent magnet 31, and a rotation mechanism 50. The rotation mechanism 50 relatively rotates the outer peripheral rotor 20 and the inner peripheral rotor 30 using the control motor 53. As a result, the field magnetic flux can be accurately controlled regardless of the load torque and the rotational speed. Therefore, the rotary electric machine 1 can be driven in an optimal driving situation.

In the present embodiment, in particular, the inner circumferential rotor 30 includes a second permanent magnet 31 disposed in a cylindrical shape on the outer circumferential surface, and a torsional spline portion 31a provided on the inner circumferential surface. The inner circumferential rotor 30 has second permanent magnets 31 arranged in a cylindrical shape on the outer circumferential surface, so that, for example, a plurality of second permanent magnets are formed between the magnets when arranged at a plurality of locations in the circumferential direction. It is possible to eliminate a connecting portion that causes an increase in leakage of magnetic flux. Thereby, since a leakage magnetic flux can be reduced, when increasing a field magnetic flux, a powerful torque can be obtained.

In the present embodiment, in particular, the second permanent magnet 31 is a single cylindrical permanent magnet in which N poles and S poles having the same number of poles as the outer peripheral rotor 20 are alternately magnetized on the outer peripheral surface. Thereby, since the unevenness | corrugation and a level | step difference are lose | eliminated in the outer periphery of the inner peripheral side rotor 30, and it does not get caught, it can design so that the clearance gap with the outer peripheral side rotor 20 may become the minimum.

In this embodiment, in particular, the outer peripheral rotor 20 has an outer periphery provided with a permanent magnet storage portion 23 for storing the first permanent magnet 21, which has a connecting portion 24 on the outer peripheral side and an opening on the inner peripheral side. A side rotor core 22 is provided. Thereby, it can be set as the structure which does not have the connection part which causes the increase in the leakage of magnetic flux inside the 1st permanent magnet 21 accommodated in the permanent magnet accommodating part 23 of the outer peripheral side rotor 20. FIG. As a result, a strong torque can be obtained when the field magnetic flux is increased.

Further, particularly in the present embodiment, the outer circumferential rotor core 22 is fixed by two second bolts 18 for each pole. Thereby, even if the permanent magnet storage part 23 of the outer peripheral side rotor core 22 is the shape opened to the inner peripheral side, a deformation | transformation of the outer peripheral side rotor core 22 is prevented and the clearance gap with the inner peripheral side rotor 30 is maintained. And can be designed to minimize the gap.

In the present embodiment, in particular, the shaft 2 including the large-diameter portion 2a in which the through-hole 27a that penetrates the first bolt 17 in the axial direction is formed, and the shafts of the outer peripheral rotor 20 and the inner peripheral rotor 30. Two

side plates

15 and 16 which are arranged on both sides in the direction, the outer peripheral side is fixed by the outer peripheral rotor 20 and the second bolt 18, and the inner peripheral side is fixed by the large diameter portion 2 a of the shaft 2 and the first bolt 17. Have. Thereby, the outer peripheral side rotor 20 can be fixed to the shaft 2. Further, since the

side plates

15 and 16 are directly fixed to the shaft 2, the radial dimension of the rotating electrical machine 1 can be reduced as compared with the case where other members are interposed between the

side plates

15 and 16 and the shaft 2.

In the present embodiment, in particular, the inner circumferential rotor 30 is restricted from moving in the axial direction by the two

side plates

15 and 16. As a result, the outer rotor 20 can be held against a large torque with a simple structure, and the axial movement of the inner rotor 30 can be restricted against a large axial thrust.

In the present embodiment, in particular, the side plate 16 has a storage groove 16a for storing the head portion 18a of the second bolt 18, and the side plate 15 is a screw into which the shaft portions of the first bolt 17 and the second bolt 18 are screwed. It has

holes

15a and 15b. Thereby, the structure of the rotor can be simplified as compared with the structure in which the head portion 18a of the second bolt 18 protrudes from the side plate 16 or the shaft portions of the

bolts

17 and 18 are screwed into the nut outside the side plate 15.

In the present embodiment, in particular, the rotation mechanism 50 is spline-coupled to the inner circumferential side rotor 30 in the torsional direction inside the inner circumferential side rotor 30, and slides on the outer side of the shaft 2 in the axial direction. 2 and a feed screw mechanism (feed male screw 41, feed female screw 44, etc.) configured to move the slider 34 in the axial direction, and the control motor 53 includes the feed screw mechanism. Configured to rotate. As a result, it is possible to realize a mechanism in which the outer peripheral rotor 20 and the inner peripheral rotor 30 are relatively rotated by the control motor 53.

<2. Second Embodiment>
Next, the configuration of the rotating electrical machine according to the second embodiment will be described with reference to FIGS. 10 to 12. 10 to 12, the same components as those in FIGS. 2 to 4 are denoted by the same reference numerals, and description thereof will be omitted or simplified as appropriate.

(2-1. Configuration of rotating electrical machine)
As shown in FIGS. 10 and 11, in the rotating electrical machine 1 A, the outer peripheral side rotor 20 A and the inner peripheral side rotor 30 A are disposed inside the stator 10.

The outer peripheral side rotor 20 A includes an outer peripheral side rotor core 22 A and a plurality of first permanent magnets 21. The outer peripheral side rotor core 22A is the same as the first embodiment described above in that a plurality of magnet housing portions 23 penetrating in the axial direction are provided radially along the circumferential direction, but is housed in each magnet housing portion 23. In addition, the first permanent magnet 21 has a connecting portion 24 a on the inner peripheral side. In the second embodiment, the outer rotor core 22 is fixed to the

side plates

15 and 16 by one second bolt 18 for each magnetic pole portion 25. However, the outer rotor core 22 is different from the first embodiment described above. Similarly, it may be fixed by two second bolts 18.

The inner circumferential side rotor 30A is provided on the annular inner circumferential side rotor core 29A and the inner circumferential side rotor core 29A which are arranged with a gap from the outer circumferential side rotor 20, and the outer circumferential side rotor 20 and And a plurality of (in this example, 10) second permanent magnets 32 having the same number of poles. The plurality of second permanent magnets 32 are arranged on the outer peripheral portion of the inner rotor core 29A so as to alternately repeat N-pole and S-pole magnetic poles in the circumferential direction along the circumferential direction. Grooves 42 for reducing leakage magnetic flux are formed on the outer peripheral surface of the inner peripheral rotor core 29A at positions between the second permanent magnets 32.

The inner circumferential side rotor core 29 A is fixed to the outer circumferential surface of the boss 35. As shown in FIG. 12, the boss 35 has a spline portion 35b along the axial direction on the outer peripheral surface. A spline portion 29a is formed on the inner peripheral surface of the inner peripheral rotor core 29A along the axial direction to engage with the spline portion 35b of the boss 35. A torsion spline portion 35 a that engages with a torsion spline portion 34 b formed on the outer peripheral surface of the slider 34 is formed on the inner peripheral surface of the boss 35. The boss 35 attached to the slider 34, together with the inner circumferential rotor core 29A, is engaged by a predetermined amount of movement in the axial direction of the slider 34 by engaging the torsion spline portion 35a with the torsion spline portion 34b of the slider 34. Rotate a certain amount in the direction.

Since the other configuration of the rotating electrical machine 1A is the same as that of the rotating electrical machine 1 of the first embodiment, description thereof is omitted.

(2-2. Change in field magnetic flux)
Next, changes in the field magnetic flux will be described with reference to FIGS. FIG. 13 shows the positional relationship of the inner circumferential rotor with respect to the outer circumferential rotor when a weak field state is obtained. In this state, as shown in FIG. 13, the inner rotor 30 A has the S pole of the second permanent magnet 32 relative to the N pole magnetic pole portion 25 by the two first permanent magnets 21 of the outer rotor 20. Is in a position to In this case, a part of the field magnetic flux emitted from the first permanent magnet 21 of the outer peripheral rotor 20A is short-circuited to the inner peripheral side by the magnetic flux q2 of the second permanent magnet 32, and therefore the outer rotor 20A. The field magnetic flux q1 (gap magnetic flux) from the N pole toward the outer peripheral side can be weakened.

FIG. 14 shows the positional relationship of the inner circumferential rotor with respect to the outer circumferential rotor when a medium strength field state is obtained. In this state, as shown in FIG. 14, the inner rotor 30 A has a position where the N pole and S pole of the second permanent magnet 32 substantially coincide with the position of the first permanent magnet 21 of the outer rotor 20 ( In other words, the intermediate position between the N pole and the S pole of the second permanent magnet 32 is at a position facing the magnetic pole portion 25 of the outer rotor 20A. In this case, with respect to the second permanent magnet 32, only the magnetic flux q2 from the N pole to the S pole is generated, and the magnetic flux of the first permanent magnet 21 is not drawn to the inner peripheral side. That is, the gap magnetic flux density of the field magnetic flux q1 from the N pole of the outer rotor 20A toward the outer periphery is increased as compared with the case shown in FIG. 13 because the magnetic flux of the first permanent magnet 21 is not short-circuited to the inner periphery. be able to.

FIG. 15 shows the positional relationship of the inner rotor on the outer rotor when a strong field state is obtained. In this state, as shown in FIG. 15, the inner rotor 30 A has the N pole of the second permanent magnet 32 relative to the N pole magnetic pole portion 25 by the two first permanent magnets 21 of the outer rotor 20. It is in the position to do. In this case, since the magnetic flux q2 from the N pole of the second permanent magnet 32 of the inner peripheral rotor 30A toward the outer peripheral side is added to the magnetic flux from the N pole of the first permanent magnet 21 toward the outer peripheral side, the outer peripheral rotor 20A. The gap magnetic flux density of the field magnetic flux q1 from the N pole toward the outer peripheral side is maximized.

Also in the second embodiment described above, by changing the position of the inner circumferential rotor 30A relative to the outer circumferential rotor 20A, the rotor (the outer circumferential rotor 20A and the inner circumferential rotor 30A is changed according to the load torque. ), The rotating electrical machine 1A can be operated with high efficiency from the low torque state to the high torque state. Further, the same effect as that of the first embodiment described above can be obtained.

<3. Third Embodiment>
Next, the configuration of the rotating electrical machine according to the third embodiment will be described with reference to FIGS. 16 and 17. 16 and 17, the same components as those in FIG. 2 and the like are denoted by the same reference numerals, and description thereof will be omitted or simplified as appropriate.

(3-1. Configuration of rotating electrical machine)
As shown in FIG. 16, in the rotating electrical machine of the third embodiment, the outer peripheral side rotor 20 B and the inner peripheral side rotor 30 B are arranged inside the stator 10. The outer circumferential rotor 20B includes an outer circumferential rotor core 22B and a plurality (16 in this example) of first permanent magnets 21 provided on the outer circumferential rotor core 22B.

The outer peripheral rotor core 22 B includes a plurality of magnet storage portions 23 (an example of a permanent magnet storage portion) for installing the plurality of first permanent magnets 21. The outer peripheral rotor core 22 B has a connecting portion 24 on the outer peripheral side of each magnet storage portion 23. In the plurality of magnet storage portions 23, a plurality of pairs (eight pairs in this example) of a pair of

magnet storage portions

23, 23 arranged substantially in a V shape when viewed from the axial direction are arranged along the circumferential direction. And provided on the outer rotor core 22B. The plurality of pairs of first permanent magnets 21 housed in the magnet housing portion 23 have the same or opposite N poles or S poles of each pair of first permanent magnets 21, and the N poles, The magnetic poles of the S poles are arranged so as to be alternately repeated in the circumferential direction, and the N pole and S pole magnetic pole parts 25 are alternately formed in the circumferential direction on the outer peripheral portion of the outer rotor core 22B.

The inner circumferential side rotor 30B has an inner circumferential side rotor core 29B fixed to the boss 35. The inner circumferential side rotor core 29B has a plurality (eight in this example) of gaps 40a that open to the outer circumferential surface, and salient poles 40b that are formed between the gaps 40a. It is preferable that the size of the opening of the gap portion 40 a extends to both ends in the circumferential direction on the inner peripheral side of the two first permanent magnets 21 located between the adjacent magnetic pole portions 25.

(3-2. Change in field magnetic flux)
In the present embodiment, when the field magnetic flux is weakened, as shown in FIG. 16, the salient pole part 40b of the inner rotor 30B is substantially opposed to the magnetic pole part 25 of the outer rotor 20B. The inner circumferential side rotor 30B is positioned. As a result, a part of the magnetic flux q3 out of the field magnetic flux emitted from the N pole of the first permanent magnet 21 of the outer rotor 20B is short-circuited to the inner periphery by the inner rotor core 29B. It is possible to reduce the field magnetic flux q1 from the N pole of the rotor 20B toward the outer peripheral side.

When the field magnetic flux is strengthened, as shown in FIG. 17, the inner circumferential rotor 30B is arranged so that the gap 40a of the inner circumferential rotor 30B is substantially opposed to the magnetic pole portion 25 of the outer circumferential rotor 20B. Position. Thereby, since all the field magnetic flux which comes out from the N pole of the 1st permanent magnet 21 of the outer peripheral side rotor 20B can be made to go to an outer peripheral side, the field magnetic flux q1 can be enlarged.

According to the third embodiment described above, it is possible to increase or decrease the field magnetic flux of the rotor (the outer peripheral side rotor 20B and the inner peripheral side rotor 30B) with a simple configuration.

In the above, the rotation mechanism 50 corresponds to an example of means for electrically rotating the outer peripheral side rotor and the inner peripheral side rotor relative to each other.

In addition, in the above description, when there are descriptions such as “vertical”, “parallel”, and “plane”, the descriptions are not strict. That is, the terms “vertical”, “parallel”, and “plane” are acceptable in design and manufacturing tolerances and errors, and mean “substantially vertical”, “substantially parallel”, and “substantially plane”. .

In addition, in the above description, when there is a description such as “same”, “equal”, “different”, etc., in terms of external dimensions and size, the description is not strict. That is, the terms “identical”, “equal”, and “different” mean that “tolerance and error in manufacturing are allowed in design and that they are“ substantially identical ”,“ substantially equal ”, and“ substantially different ”. .

In addition to those already described above, the methods according to the above embodiments may be used in appropriate combination.

In addition, although not illustrated one by one, the above-described embodiment is implemented with various modifications within a range not departing from the gist thereof.

DESCRIPTION OF SYMBOLS 1,1A Rotating electrical machine 2 Shaft 2a Large diameter part 15 Side plate

15a Screw hole

15b Screw hole 16 Side plate 16a Storage groove (an example of recessed part)
17 1st bolt 18 2nd bolt 18a head 20 outer circumference side rotor 20A outer circumference side rotor 20B outer circumference side rotor 21 first permanent magnet 22 outer circumference side rotor core 22A outer circumference side rotor core 23 magnet housing (permanent magnet) Example of storage unit)
24 connecting portion 27a through hole 30 inner circumferential side rotor 30A inner circumferential side rotor 30B inner circumferential side rotor 31 second permanent magnet 31a torsion spline portion 32 second permanent magnet 34 slider 41 feed male screw (an example of feed screw mechanism)
44 Female feed screw (an example of feed screw mechanism)
50 Rotating mechanism 53 Control motor

Claims

A variable field type rotating electric machine that changes a field magnetic flux,
An outer peripheral rotor including a plurality of first permanent magnets arranged in the circumferential direction;
An inner circumferential rotor that is coaxially disposed inside the outer circumferential rotor and includes a second permanent magnet;
A rotation mechanism configured to relatively rotate the outer circumferential rotor and the inner circumferential rotor by a control motor;
A rotating electric machine comprising:
The inner circumferential rotor is
One or a plurality of the second permanent magnets arranged in a cylindrical shape on the outer peripheral surface;
The rotating electrical machine according to claim 1, further comprising: a torsion spline portion provided on an inner peripheral surface.
The second permanent magnet is
3. The rotating electrical machine according to claim 1, wherein the rotating electrical machine is a cylindrical permanent magnet in which N poles and S poles having the same number of poles as the outer peripheral rotor are alternately magnetized on the outer peripheral surface.
The outer circumferential rotor is
4. The rotor core according to claim 1, further comprising an outer rotor core provided with a permanent magnet storage portion for storing the first permanent magnet, wherein the outer peripheral side has a connecting portion and is open to the inner periphery. The rotating electrical machine according to any one of claims.
The outer rotor core is
The rotating electrical machine according to claim 4, wherein the rotating electric machine is fixed by two second bolts for each pole.
A shaft having a large-diameter portion formed with a through-hole through which the first bolt penetrates in the axial direction;
The outer peripheral side rotor and the inner peripheral side rotor are disposed on both sides in the axial direction, the outer peripheral side is fixed by the outer peripheral side rotor and the second bolt, and the inner peripheral side is the large diameter portion of the shaft and the first Two side plates fixed with one bolt;
The rotating electrical machine according to claim 1, further comprising:
The inner circumferential rotor is
The rotary electric machine according to claim 6, wherein axial movement is restricted by the two side plates.
The side plate is
A recess for housing at least one head of the first bolt and the second bolt;
The rotating electrical machine according to claim 6, further comprising: a screw hole into which at least one shaft portion of the first bolt and the second bolt is screwed.
The rotation mechanism is
A slider connected to the shaft so as to slide in the axial direction on the outer side of the shaft;
A feed screw mechanism configured to move the slider in the axial direction;
The control motor is
The rotating electrical machine according to any one of claims 1 to 8, wherein the rotating electrical machine is configured to rotate the feed screw mechanism.