WO2012086613A1

WO2012086613A1 - Rotating electrical machine

Info

Publication number: WO2012086613A1
Application number: PCT/JP2011/079426
Authority: WO
Inventors: 大矢　聡義; 阿部　典行; 重光圷; 石川　聡; 隆仁金澤
Original assignee: 本田技研工業株式会社
Priority date: 2010-12-24
Filing date: 2011-12-19
Publication date: 2012-06-28

Abstract

An outer rotor (30) configures an inductive magnetic pole row arranged between a stator and an inner rotor and is provided with a cylindrical rotor core (40) and with first flanges (31) and second flanges (32) on both sides of said cylindrical rotor core. The rotor core (40) is configured from a laminate body comprising integral annular electromagnetic steel sheets laminated in the axial direction. The rotor core (40) is provided with multiple magnetic parts (41) which, spaced at a constant pitch in the circumferential direction, extend in the axial direction and each of which configures an inductive magnetic pole; the rotor core (40) is also provided with multiple connection parts (43) which connect adjacent magnetic parts (41). The adjacent magnetic parts (41) and the connection parts (43) define substantially trapezoidal spaces (42) configuring non-magnetic parts.

Description

Rotating electric machine

The present invention relates to a rotating electrical machine that can be used as an electric motor or a generator, and more particularly to a multi-rotor rotating electrical machine that includes two rotors that can rotate independently.

2. Description of the Related Art Conventionally, a multi-rotor rotating electrical machine is disposed between an annular stator, an inner rotor (first rotor) that can rotate inside the stator, and the stator and the inner rotor, and can rotate concentrically with the inner rotor. An outer rotor (second rotor). The stator includes an armature array that includes a plurality of armatures and generates a rotating magnetic field that rotates along the circumferential direction. The inner rotor includes a magnetic pole array that includes a plurality of permanent magnets. The rotor includes an induction magnetic pole row composed of a plurality of induction magnetic poles made of a soft magnetic material. Further, the armature row of the stator and the magnetic pole row of the inner rotor face each other on both sides in the radial direction of the induction magnetic pole row of the outer rotor (see, for example, Patent Document 1).

In the second rotor of the electric motor described in Patent Document 1, the outer periphery of the first flange and the second flange disposed so as to be rotatable around the axis is made of a weak magnetic material and disposed at predetermined intervals in the circumferential direction. A configuration is adopted in which both ends of the plurality of connecting members are fixed and an induction magnetic pole made of a soft magnetic material is supported between the connecting members adjacent in the circumferential direction.

Japanese Unexamined Patent Publication No. 2008-271725

However, in the rotating electric machine described in Patent Document 1, since it is necessary to support the induction magnetic poles between the connecting members adjacent in the circumferential direction during assembly, the structure is complicated and the assembly is very complicated. It was. In particular, since each induction magnetic pole is composed of a laminated body of electromagnetic steel sheets, improvement in assemblability has been desired.

The present invention has been made in view of the above-described circumstances, and an object thereof is to simplify the configuration of the second rotor having the induction magnetic pole row to improve the assemblability, and to improve the rigidity of the second rotor against the centrifugal force. It is in providing the rotary electric machine which can improve.

In order to achieve the above object, the invention according to claim 1
An annular stator (for example, a stator 10 in an embodiment described later), a first rotor (for example, an inner rotor 20 in an embodiment described later) rotatably supported inside or outside the stator, the stator and the A second rotor (for example, an outer rotor 30 in an embodiment described later) disposed between the first rotor and rotatably supported concentrically with the first rotor, and the first rotor, A magnetic pole array configured by arranging a plurality of permanent magnets (for example, permanent magnets 23 in embodiments described later) so as to have magnetic poles of different polarities alternately at a predetermined pitch in the circumferential direction; Are arranged in a plurality of armatures (for example, a plurality of armatures 12 in an embodiment described later), and are arranged so as to face the magnetic pole row. A plurality of armature rows that generate a rotating magnetic field in the circumferential direction by a plurality of predetermined armature magnetic poles generated in the armature, and wherein the second rotor is a plurality of soft magnetic bodies arranged at a predetermined pitch in the circumferential direction. In a rotating electrical machine including an induction magnetic pole array (for example, a magnetic portion 41 in an embodiment described later) and including an induction magnetic pole array disposed between the magnetic pole array of the first rotor and the armature array of the stator, The two rotors are positioned at both ends in the axial direction of the rotor core so as to support a cylindrical rotor core (for example, a rotor core 40 in an embodiment described later) positioned at the center in the axial direction of the second rotor. A disk-shaped first flange (for example, a first flange 31 in an embodiment described later) and a second flange (for example, a second flange 32 in an embodiment described later), The rotor core is configured by a laminated body in which integral annular soft magnetic bodies are laminated in the axial direction, and the rotor core includes a plurality of connecting portions that respectively connect the adjacent induction magnetic poles (for example, connecting portions in embodiments described later). 43), and the adjacent induction magnetic pole and the connecting portion define a space portion (for example, a space portion 42 in an embodiment described later) constituting a nonmagnetic portion.

According to a second aspect of the present invention, in the rotating electrical machine according to the first aspect, the connecting portion connects an inner peripheral side connecting portion (for example, described later) that connects the adjacent induction magnetic poles on the inner peripheral side and the outer peripheral side, respectively. It is comprised from the inner peripheral side connection part 43a) and outer peripheral side connection part (For example, the outer peripheral side connection part 43b in embodiment mentioned later), and the radial direction distance of this outer peripheral side connection part and the said stator is said induction | guidance | derivation. It is larger than the radial distance between the magnetic pole and the stator.

According to a third aspect of the present invention, in the rotating electrical machine according to the second aspect, the outer peripheral side connecting portion has a substantially linear shape when viewed from the axial direction.

According to a fourth aspect of the present invention, in the rotating electrical machine according to the second aspect, the outer peripheral side connecting portion is formed such that a radial width increases from a circumferential center to a circumferential end. It is characterized by.

The invention according to claim 5 is the rotating electrical machine according to any one of claims 2 to 4, wherein the connecting portion connects a circumferential side surface of each induction magnetic pole and an inner surface of the outer peripheral side connecting portion. And a pair of reinforcing portions (for example, a reinforcing portion 43c in an embodiment described later).

According to a sixth aspect of the present invention, in the rotating electrical machine according to any one of the first to fifth aspects, the connecting member that interconnects the first flange and the second flange (for example, a shoulder bolt in an embodiment described later) 50), and the connecting member penetrates the space portion of the rotor core so as to be located on the inner peripheral side with respect to the radially intermediate portion of the rotor core.

According to the first aspect of the invention, the structure of the rotor core is simplified, the assembly is simplified, and the rigidity of the second rotor against the centrifugal force can be improved.

According to the invention of claim 2, since the magnetic flux that is short-circuited from the stator to the outer peripheral side connection portion is reduced and the effective magnetic flux penetrating the induction magnetic pole can be increased, the motor torque can be increased.

According to the invention of claim 3, it is possible to improve the centrifugal rigidity of the rotor core.

According to the invention of claim 4, the rigidity of the rotor core can be improved, and the central portion in the circumferential direction of the outer peripheral side connecting portion is formed thinner than the peripheral end portion, so that the connecting member is disposed in the space portion. When it does, the radial direction distance of an outer peripheral side connection part and a connection member does not become short, but it can suppress that a magnetic flux short-circuits to a connection member via an outer peripheral side connection part from a stator.

According to the invention of claim 5, it is possible to increase the rigidity of the rotor core.

According to the invention of claim 6, since the radial distance between the outer peripheral side connecting portion and the connecting member is increased and the magnetic resistance due to the air gap therebetween increases, the connection from the stator via the outer peripheral side connecting portion. The short circuit of magnetic flux to the member is suppressed, and the motor efficiency can be improved. Furthermore, the first flange and the second flange can be firmly coupled by the connecting member while effectively using the empty space, without adversely affecting the induction magnetic pole of the rotor core.

It is the front view which looked at the electric motor as a rotary electric machine of 1st Embodiment of this invention from the axial direction. It is a disassembled perspective view of the electric motor which abbreviate | omits the casing which is the outer shell body of the rotary electric machine, and takes out and shows an inner rotor from an outer rotor. FIG. 3 is a sectional view taken along line III-III in FIG. FIG. 4 is a half sectional view taken along line IV-IV in FIG. 3. It is a disassembled perspective view of the outer rotor of the same electric motor. (A) is a perspective view of the rotor core of the outer rotor, (b) is a front view of (a) seen from the axial direction, and (c) is a shoulder bolt passing through the space of the rotor core of (a). It is principal part sectional drawing explaining the state which is carrying out. It is a partially expanded sectional view of FIG. 3 which shows the structure of the coupling | bond part by the shoulder bolt of the same outer rotor. 3A is a partially enlarged cross-sectional view of FIG. 3 showing a configuration of a portion where the torque transmission pin of the outer rotor is arranged, and FIG. 3B is a cross-sectional view taken along the line VII-VII of FIG. FIG. It is a figure for demonstrating the arrangement position of the slider in the circumferential direction of the outer rotor, and is a figure which shows a flange seeing from the inner side of an axial direction. (A) is the perspective view of the rotor core of the outer rotor of the electric motor as a rotary electric machine of 2nd Embodiment, (b) is the front view which looked at (a) from the axial direction, (c) is (a). It is principal part sectional drawing explaining the state which the shoulder bolt has penetrated the space part of this rotor core. It is a figure which shows the 1st modification of the said rotor core, and is principal part sectional drawing explaining the state which the shoulder bolt has penetrated the space part of the same rotor core. It is a figure which shows the 2nd modification of the said rotor core, and is principal part sectional drawing explaining the state which the shoulder bolt has penetrated the space part of the same rotor core. (A) is the perspective view of the 3rd modification of the said rotor core, (b) is the front view which looked at (a) from the axial direction, (c) is a shoulder bolt for the space part of the rotor core of (a) It is principal part sectional drawing explaining the state which has penetrated. It is principal part sectional drawing explaining the state which the shoulder bolt has penetrated the space part of the rotor core of the outer rotor of the electric motor as a rotary electric machine of 3rd Embodiment. It is a figure which shows the 1st modification of the said rotor core, and is principal part sectional drawing explaining the state which the shoulder bolt has penetrated the space part of the same rotor core.

Hereinafter, a rotating electrical machine according to each embodiment of the present invention will be described in detail with reference to the drawings.

<< First Embodiment >>
1 to 9 are views showing an electric motor as a rotating electric machine according to the first embodiment. As shown in FIGS. 1 to 4, the electric motor includes a casing 1, an annular stator 10 fixed to the inner periphery of the casing 1, and an axis line that is housed on the inner periphery side of the stator 10 and is common to the stator 10. A cylindrical outer rotor (second rotor) 30 that rotates around x, and a cylindrical inner rotor (first rotor) 20 that is housed concentrically inside the outer rotor 30 and rotates about the axis x. Has been.

The outer rotor 30 and the inner rotor 20 can be rotated relative to the stator 10 fixed to the casing 1, and the outer rotor 30 and the inner rotor 20 can be rotated relative to each other. As shown in FIG. 3, the casing 1 includes a bottomed cylindrical main body 2 and a lid 3 fixed to the opening of the main body 2.

《Stator》
The stator 10 includes an annular stator core 11 in which electromagnetic steel plates are laminated. A plurality (48 in this embodiment) of teeth 13 and a plurality (48 in this embodiment) are provided on the inner peripheral surface of the stator core 11. The slots 14 are alternately formed in the circumferential direction. A U-phase, V-phase, and W-phase coil is distributedly wound in the slot 14 of the stator core 11, and each tooth 13 and each coil constitute a plurality of armatures 12, and each armature 12 is constant in the circumferential direction. An armature row is configured by being arranged at a pitch. The armature row of the stator 10 faces a magnetic pole row of the inner rotor 2 described later. Then, by supplying a three-phase alternating current from three terminals (not shown) provided in the casing 1 to the U-phase, V-phase, and W-phase coils, a plurality of predetermined virtual elements generated in the plurality of armatures 12 are provided. A circumferential rotating magnetic field is generated by a typical armature magnetic pole. In the present embodiment, the number of armature magnetic poles generated in the stator 10 is set to 16, and therefore the number of magnetic pole pairs of the armature magnetic poles is set to 8.

《Outer rotor》
As shown in FIG. 3 and FIG. 5, the outer rotor 30 that houses the inner rotor 20 includes a cylindrical rotor core 40 that is located in the center in the axial direction, and the rotor core 40 that supports the rotor core 40 at each outer peripheral portion. Disc-shaped first flange 31 and second flange 32 disposed on both ends in the axial direction.

A first outer rotor shaft 33 is connected to the central portion of the first flange 31 in the radial direction, and the first outer rotor shaft 33 is rotatably supported by the lid portion 3 of the casing 1 via a ball bearing 35. Has been. In addition, a second outer rotor shaft 34 is connected to the radial center portion of the second flange 32, and the second outer rotor shaft 34 is rotatable to the main body portion 2 of the casing 1 via a ball bearing 36. It is supported. And the 1st outer rotor shaft 33 used as the output shaft of the outer rotor 30 penetrates the cover part 3 of the casing 1, and is extended outside.

In the present embodiment, the first flange 31 and the second flange 32 are made of a nonmagnetic material (for example, stainless steel), and the first and second

outer rotor shafts

33 and 34 are made of a magnetic material (carbon steel) that is less expensive than the nonmagnetic material. ). The reason why the first flange 31 and the second flange 32 are made of a non-magnetic material is to suppress leakage magnetic flux from the rotor core 40.

The rotor core 40 of the outer rotor 30 has an induction magnetic pole array in which a plurality of induction magnetic poles made of soft magnetic material are arranged at a predetermined pitch in the circumferential direction. The induction magnetic pole array includes a magnetic pole array of the inner rotor 20 described later, It is located between the armature rows of the stator 10 described above. A soft magnetic material is a kind of magnetic material that generates a magnetic pole when a magnetic force is applied and disappears when the magnetic force is removed.

Specifically, the rotor core 40 of the outer rotor 30 is constituted by a laminated body in which electromagnetic steel plates (for example, silicon steel plates) that are soft magnetic bodies having an annular shape are laminated in the axial direction. As shown in FIGS. 6A and 6B, the rotor core 40 is adjacent to a plurality of magnetic portions 41 that respectively constitute induction magnetic poles that extend in the axial direction with a constant pitch in the circumferential direction. A plurality of connecting portions 43 each composed of an inner peripheral side connecting portion 43a and an outer peripheral side connecting portion 43b for connecting the magnetic portions 41 to each other on the inner peripheral side and the outer peripheral side, respectively. The peripheral side connecting part 43a and the outer peripheral side connecting part 43b define a substantially trapezoidal space part 42 constituting a nonmagnetic part. The inner peripheral side connecting portion 43 a and the outer peripheral side connecting portion 43 b of the present embodiment are formed in a substantially arc shape along the inner peripheral surface and the outer peripheral surface of the magnetic portion 41. Thereby, in this embodiment, the number of the induction magnetic poles comprised by the magnetic part 41 is set to 20, Therefore, the number of the induction magnetic pole pairs is set to 10. Moreover, the through-hole 41a is each provided in the four magnetic parts 41 arrange | positioned at a 90 degree pitch in the circumferential direction.

As shown in FIGS. 3 to 5, torque transmission for transmitting torque generated in the rotor core 40 to the first flange 31 and the second flange 32 is provided between the first flange 31 and the second flange 32 of the outer rotor 30. A pin 60 is disposed. The shoulder bolt that interconnects the first flange 31 and the second flange 32 in a state where the distance between the first flange 31 and the second flange 32 is maintained at a constant value that is slightly larger than the axial length of the rotor core 40. (Connecting member) 50 is arranged. In the present embodiment, four torque transmission pins 60 are provided at a 90 ° pitch in the circumferential direction. Further, three sets of four shoulder bolts 50 arranged at a 90 ° pitch in the circumferential direction are provided, and a total of 12 shoulder bolts 50 are provided.

As shown in FIG. 7, the shoulder bolt 50 is a rod-shaped body having a shoulder portion (step portion) 51 with an enlarged outer diameter in the vicinity of both ends, and has

male screw portions

52 and 53 on the outer side in the axial direction of the shoulder portion 51. ing. The shoulder bolt 50 penetrates the substantial center of the space portion 42 of the rotor core 40 in a non-contact state (in FIG. 6C, the alternate long and short dash line indicates a substantially intermediate portion in the radial direction of the rotor core 40) and is provided at one end. One end is coupled to the second flange 32 by screwing the formed male screw portion 52 into the screw hole 32 a of the second flange 32, and the male screw portion 53 provided at the other end is inserted into the screw passage hole 31 a of the first flange 31. The other end is coupled to the first flange 31 by passing it through and screwing the nut 54 from the outside of the first flange 31.

The shoulder bolt 50 is coupled to the first flange 31 and the second flange 32 in this manner, so that the inner surfaces of the first flange 31 and the second flange 32 abut on the shoulder portion 51 of the shoulder bolt 50. The position is restricted. Thereby, the first flange 31 and the second flange 32 are firmly connected and integrated with each other in a state where a space slightly larger than the axial dimension of the rotor core 40 is secured between the inner surfaces of the

flanges

31 and 32. Has been. Thereby, the rotor core 40 is not subjected to the axial force (compressive stress) generated when the shoulder bolt 50 is tightened. The shoulder bolt 50 is also made of a non-magnetic material in order to reduce eddy current loss.

A wave washer 80 is interposed between the shoulder portion 51 on the second flange 32 side and the side surface of the rotor core 40. The wave washer 80 positions the rotor core 40 so that it does not rattle in the axial direction. Yes. Further, washers 55 are sandwiched between the contact surface of the shoulder portion 51 on the first flange 31 side and the contact surface of the first flange 31 and between the contact surface of the nut 54 and the first flange 31, respectively.

As shown in FIG. 8, the torque transmission pin 60 is press-fitted into a through hole 41 a formed in the magnetic part 41 of the rotor core 40, and both ends protrude from both end surfaces of the rotor core 40. Although the rotor core 40 is composed of a laminate of a large number of electromagnetic steel sheets, the torque transmission pin 60 is press-fitted into the magnetic part 41, so that the rotor core 40 is positioned mutually in the circumferential direction and the radial direction, and the whole They are joined together. Therefore, the rigidity with respect to the centrifugal force of the outer rotor 30 can be improved. Moreover, the electromagnetic steel plates constituting the laminate may be bonded by caulking or bonding, and even if the bonding by caulking or bonding is omitted, the electromagnetic steel plates can be prevented from being scattered.

Both ends of each torque transmission pin 60 are fitted to a rectangular piece-like slider 65 when viewed from the front, and each slider 65 is radially formed on the inner surface of the outer peripheral portion of the first flange 31 and the second flange 32. It is possible to slide in the radial direction (in the direction of arrow A in FIG. 8B) by being engaged with the engaging grooves 39 formed along the guide grooves and guided to opposite side surfaces of the engaging grooves 39 which are parallel to each other. ing.

In this case, the center line in the width direction of the engagement groove 39 is a radial line passing through the axial center of the outer rotor 30, and the opposite side surface of the engagement groove 39 is parallel to the center line in the width direction of the engagement groove 39. Is formed. Similarly, the opposing side surface that slides on the opposing side surface of the engagement groove 39 of the rectangular piece-shaped slider 65 is formed to be parallel to the center line in the width direction of the engagement groove 39.

Due to the slider 65 and the engagement groove 39, the relative displacement in the radial direction between the rotor core 40 and the first and second flanges 31, 32 (the radial direction between the rotor core 40 and the first and second flanges 31, 32). A vibration absorbing mechanism that absorbs (vibration) is configured.

That is, radial force such as centrifugal force accompanying rotation and magnetic force acting between the stator 10 and the inner rotor 20 acts on the rotor core 40. Due to the action of the radial force, a relative displacement in the radial direction is generated between the

flanges

31 and 32 and the rotor core 40 due to factors such as a difference in material and a difference in shape. When this relative displacement is suppressed by rigidly connecting the

flanges

31 and 32 and the rotor core 40, a large stress is generated in the rotor core 40 and the magnetic characteristics are impaired. Therefore, in order to absorb the relative displacement in the radial direction between the

flanges

31 and 32 and the rotor core 40, a vibration absorbing mechanism including the slider 65 and the engagement groove 39 is provided between the

flanges

31 and 32 and the rotor core 40. It has been.

The combination of the slider 65 and the engagement groove 39 serves to transmit the circumferential torque transmitted from the rotor core 40 to the torque transmission pin 60 to the

flanges

31 and 32. Torque transmitted to the torque transmission pin 60 is transmitted to the slider 65, and is transmitted from the slider 65 to the

flanges

31 and 32 through the opposing side surfaces of the engagement groove 39. At this time, the surface that contributes to the transmission of force is a contact surface between the opposed side surface of the slider 65 and the opposed side surface of the engagement groove 39. In this vibration absorbing mechanism, since the opposing side surface of the rectangular slider 65 is the entire contact surface with respect to the opposing side surface of the engaging groove 39, an increase in contact surface pressure can be suppressed.

Further, in this embodiment, as shown in FIG. 9, since the sliders 65 are arranged at a pitch of 90 ° in the circumferential direction, the rotor core 40 can be positioned in the X direction and the Y direction orthogonal to each other.

《Inner rotor》
As shown in FIG. 3, the inner rotor 20 includes a rotor body 21 that is formed in a cylindrical shape, an inner rotor shaft 25 that is fixed through the hub 21 a of the rotor body 21, and a laminated steel plate. 21 and an annular rotor core 22 disposed on the outer peripheral portion. The inner rotor shaft 25 is rotatably supported by the ball bearing 38 inside the first outer rotor shaft 33 on the axial line on one end side (right side in the drawing) with respect to the hub 21a, and on the other end side with respect to the hub 21a. In the second outer rotor shaft 34 (on the left side in the figure), it is rotatably supported by a ball bearing 37. The other end portion of the inner rotor shaft 25 extends through the main body 2 of the casing 1 and extends outside the casing 1 as an output shaft of the inner rotor 20.

The rotor core 22 press-fitted into the outer periphery of the rotor body 21 is provided with a plurality of permanent magnet support holes 22a along the outer peripheral surface, and the permanent magnet 23 is press-fitted (or inserted and fixed by adhesion) there. Yes. The polarities of the adjacent permanent magnets 23 of the rotor core 22 are alternately reversed, whereby the inner rotor 20 has a plurality of permanent magnets 23 arranged so as to have magnetic poles having different polarities alternately at a predetermined pitch in the circumferential direction. A magnetic pole array configured as described above.

The inner peripheral surface (armature) of the teeth 13 of the stator core 11 is opposed to the outer peripheral surface of the induction magnetic pole exposed on the outer peripheral surface of the outer rotor 30 through a slight air gap, and the inner peripheral surface of the outer rotor 30 The outer peripheral surface of the rotor core 22 of the inner rotor 20 is opposed to the inner peripheral surface of the induction magnetic pole exposed at a through a slight air gap.

In this case, the number of magnetic poles by the permanent magnets 23 of the inner rotor 20 is 24, and the number of magnetic pole pairs is set to 12.
Therefore, in this electric motor, the ratio between the number of armature magnetic poles of the stator 10, the number of magnetic poles of the inner rotor 20, and the number of induction magnetic poles of the outer rotor 30 is
1: m: (1 + m) / 2 (m ≠ 1.0)
The relationship is set.

According to the electric motor of the present embodiment configured as described above, since the rotor core 40 of the outer rotor 30 is configured by a laminated body of integral annular electromagnetic steel plates, the structure of the rotor core 40 is simplified and assembly is easy. In addition, the rigidity of the outer rotor 30 with respect to the centrifugal force can be improved. In addition, the torque generated in the rotor core 40 can be reliably transmitted to both the

flanges

31 and 32 by the torque transmission pin 60 disposed between the first and

second flanges

31 and 32.

Further, when the first flange 31 and the second flange 32 located on both sides of the rotor core 40 are interconnected by the shoulder bolt 50, the shoulder bolt 50 penetrates the space portion 42 of the rotor core 40 formed in an integral annular shape. Therefore, the first flange 31 and the second flange 32 are firmly coupled to have a unity while effectively utilizing the empty space 42 without adversely affecting the magnetic portion 41 as the induction magnetic pole of the rotor core 40. be able to.

<< Second Embodiment >>
FIG. 10 is a view showing a rotor core of an outer rotor used in an electric motor as a rotating electric machine according to the second embodiment. This electric motor is different from the first embodiment in the structure of the rotor core 40. About the structure same as 1st Embodiment, the description is abbreviate | omitted by attaching | subjecting the code | symbol same as the referential mark attached | subjected to the structure on the drawing used for this embodiment.

In the rotor core 40, the inner peripheral side connecting portion 43a is formed along the inner peripheral surface of the magnetic portion 41 so as to form a uniform inner peripheral surface together with the magnetic portion 41, while the outer peripheral side connecting portion 43b is Adjacent magnetic portions 41 are connected to each other on the inner peripheral side with respect to the outer peripheral end. That is, the radial distance between the inner peripheral surface of the tooth 13 of the stator 10 and the outer peripheral surface of the outer peripheral side connecting portion 43b is larger than the radial distance between the inner peripheral surface of the tooth 13 of the stator 10 and the outer peripheral surface of the magnetic portion 41. It is formed to be large. By forming the connecting portion 43 in this way, the magnetic flux that is short-circuited from the teeth 13 of the stator 10 to the outer peripheral side connecting portion 43b is reduced, and the effective magnetic flux penetrating the magnetic portion 41 is increased, so that the motor torque can be increased. It becomes possible.

Further, as shown in FIG. 10C, the shoulder bolt 50 has its center located on the inner peripheral side of the radially intermediate portion of the rotor core 40 (the one-dot chain line in FIG. 10C). It penetrates non-contact. As a result, the radial distance between the outer peripheral side connecting portion 43b of the rotor core 40 and the shoulder bolt 50 can be prevented from being shortened, and the air gap existing between the outer peripheral side connecting portion 43b and the shoulder bolt 50 can be prevented. Since the magnetic resistance can be maintained high, a short circuit of magnetic flux from the tooth 13 of the stator 10 to the shoulder bolt 50 via the outer peripheral side connecting portion 43b is suppressed, and the motor efficiency can be improved.

In addition, the outer peripheral side connection part 43b of the connection part 43 is not necessarily limited to a substantially circular arc shape as long as the adjacent magnetic parts 41 are connected to each other.

For example, as shown in the modified example of FIG. 11, the outer peripheral side connecting portion 43b may have a substantially linear shape when viewed from the axial direction. In this case, the centrifugal rigidity of the rotor core 40 can be further improved. .

Further, as shown in the modification of FIG. 12, the outer peripheral side connecting portion 43b may be formed so that the radial width increases from the circumferential center to the circumferential end. Thereby, since the connection part of the outer peripheral side connection part 43b and the magnetic part 41 is formed thickly, the rigidity of the rotor core 40 can be improved. Further, since the central portion in the circumferential direction of the outer peripheral side connecting portion 43b is formed thinner than the peripheral end portion, the radial distance between the inner peripheral surface of the outer peripheral side connecting portion 43b and the outer peripheral side end portion of the shoulder bolt 50 is small. The short circuit of the magnetic flux from the teeth 13 of the stator 10 to the shoulder bolt 50 via the outer peripheral side connecting portion 43b can be suppressed without being shortened.

Moreover, as shown in the modification of FIG. 13, the connection part 43 connects the circumferential side surface of each adjacent magnetic part 41, and the inner surface of the outer peripheral side connection part 43b, respectively, and is substantially linear shape seeing from an axial direction. A so-called ramen structure having a pair of reinforcing portions 43c may be used, and in this case, the rigidity of the rotor core 40 can be increased.

<< Third Embodiment >>
FIG. 14 is a cross-sectional view of the main part of the rotor core of the outer rotor used in the electric motor as the rotating electrical machine of the third embodiment. This electric motor is different from the above embodiment in the structure of the rotor core 40. About the structure same as the said embodiment, the code | symbol same as the referential mark attached | subjected to the structure is attached | subjected on drawing used for this embodiment, and the description is abbreviate | omitted.

In this rotor core 40, the connecting portion 43 does not have the inner peripheral side connecting portion 43 a, and the space portion 42 is an outer peripheral side where the adjacent magnetic portions 41 are connected to each other on the outer peripheral side. The connecting portion 43b is defined so that the inner peripheral side is opened. Further, the shoulder bolt 50 has an outer peripheral side end located on the inner peripheral side with respect to a substantially intermediate portion in the radial direction of the rotor core 40 (a chain line in FIG. 14), and penetrates the space portion 42 in a non-contact manner.

As described above, in the rotor core 40 of the present embodiment, the space portion 42 is formed so as to open toward the inner peripheral side, so that the shoulder bolt 50 can be disposed closer to the opening of the space portion 42. Accordingly, the radial distance between the outer peripheral side connecting portion 43b of the rotor core 40 and the shoulder bolt 50 is increased, and the magnetic resistance due to the air gap is increased, so that the stator 10 is connected via the outer peripheral side connecting portion 43b from the teeth 13. A magnetic flux short circuit to the shoulder bolt 50 is suppressed, and the motor efficiency can be improved.

As shown in the modification of FIG. 15, the outer peripheral side connecting portion 43b is formed so as to connect adjacent magnetic portions 41 to each other on the inner peripheral side with respect to the outer peripheral side end portion, as in the second embodiment. May be.

As another modification, in the rotor core 40 shown in FIGS. 11, 12, and 13, the space portion 42 is formed so as to open to the inner peripheral side, and the shoulder bolt 50 is near the inner peripheral side end portion of the space portion 42. It is good also as a structure arrange | positioned.

In addition, this invention is not limited to embodiment mentioned above, A deformation | transformation, improvement, etc. are possible suitably.
In addition, the material, shape, dimensions, number, arrangement location, and the like of each component in the above-described embodiment are arbitrary and are not limited as long as the present invention can be achieved.
For example, in the above-described embodiment, the tightening of the rotor core 40, the first flange 31 and the second flange 32 using the shoulder bolt 50 prevents the axial force for tightening from acting on the rotor core 40. The connecting member of the present invention may be configured to fasten these components using a normal fastening bolt in a state where a fastening force is applied in the axial direction.
In the above-described embodiment, one magnetic pole is composed of a single permanent magnet magnetic pole, but may be composed of a plurality of permanent magnet magnetic poles. For example, by arranging these two permanent magnets in an inverted V shape so that the magnetic poles of the two permanent magnets approach each other on the stator side, one magnetic pole is formed, thereby increasing the directivity of the magnetic field lines. May be. Furthermore, instead of the permanent magnet, an electromagnet or an armature capable of generating a moving magnetic field may be used.
In the above-described embodiment, the U-phase to W-phase coils are wound around the slots by distributed winding. However, the present invention is not limited to this, and concentrated winding may be used. Furthermore, in the above-described embodiment, the coil is configured by a U-phase to W-phase three-phase coil. However, the number of phases of the coil is not limited to this, and may be arbitrary as long as a rotating magnetic field can be generated.
In the above-described embodiment, the inner rotor 20 as the first rotor and the outer rotor 30 as the second rotor are arranged inside the stator 10. However, the present invention is not limited to this, and the first rotor and the second rotor are connected to the stator 10. You may arrange | position outside.

This application is based on Japanese Patent Application 2010-287537 filed on December 24, 2010, the contents of which are incorporated herein by reference.

10 Stator 12 Armature 20 Inner Rotor (First Rotor)
23 Permanent magnet 30 Outer rotor (second rotor)
31 First flange 32 Second flange 40 Rotor core 41 Magnetic part (induction magnetic pole)
42 space part 43 connection part 43a inner periphery side connection part 43b outer periphery side connection part 43c reinforcement part 50 shoulder bolt (connection member)

Claims

An annular stator, a first rotor supported rotatably inside or outside the stator, and disposed between the stator and the first rotor and rotatably supported concentrically with the first rotor. A second rotor,
The first rotor includes a magnetic pole array configured by arranging a plurality of permanent magnets so as to have magnetic poles having different polarities alternately at a predetermined pitch in the circumferential direction,
The stator is composed of a plurality of armatures arranged in the circumferential direction, and is arranged so as to face the magnetic pole row, and in the circumferential direction by a predetermined plurality of armature magnetic poles generated by the plurality of armatures. Comprising an armature train to generate a rotating magnetic field,
The second rotor is composed of a plurality of induction magnetic poles made of a soft magnetic material arranged at a predetermined pitch in the circumferential direction, and the induction is arranged between the magnetic pole row of the first rotor and the armature row of the stator. In a rotating electrical machine having a magnetic pole row,
The second rotor includes a cylindrical rotor core positioned at an axially central portion of the second rotor, a disk-shaped first flange positioned at both axial ends of the rotor core so as to support the rotor core, and a first rotor 2 flanges,
The rotor core is composed of a laminate in which an integral annular soft magnetic material is laminated in the axial direction,
The rotor core has a plurality of connecting portions that connect the adjacent induction magnetic poles to each other, and the adjacent induction magnetic pole and the connection portion define a space portion that constitutes a non-magnetic portion. Rotating electric machine.
The connecting portion is composed of an inner peripheral side connecting portion and an outer peripheral side connecting portion that connect the adjacent induction magnetic poles on the inner peripheral side and the outer peripheral side, respectively.
2. The rotating electrical machine according to claim 1, wherein a radial distance between the outer peripheral side connecting portion and the stator is larger than a radial distance between the induction magnetic pole and the stator.
The rotating electrical machine according to claim 2, wherein the outer peripheral side connecting portion has a substantially linear shape when viewed in the axial direction.
3. The rotating electrical machine according to claim 2, wherein the outer peripheral side connecting portion is formed so that a radial width increases from a circumferential center thereof toward a circumferential end portion.
The connection part according to any one of claims 2 to 4, wherein the connection part includes a pair of reinforcement parts that connect a circumferential side surface of each induction magnetic pole and an inner surface of the outer periphery side connection part. Rotating electric machine.
A connecting member for interconnecting the first flange and the second flange;
6. The connecting member according to claim 1, wherein the connecting member penetrates the space portion of the rotor core so as to be positioned on an inner peripheral side with respect to a radially intermediate portion of the rotor core. Rotating electric machine.