JP2008289227A - Rotor for rotating electric machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce power generation and energy loss by suppressing an eddy current generated in a rotor of a rotating electric machine to the minimum, and to cut down the cost by improving the mass productivity of the rotor. <P>SOLUTION: The power generation and energy loss accompanied by the eddy current can be suppressed to the minimum by electrically insulating first flange members 32, 33 by using a cylindrical member 34 which does not flow a current, and by reducing the eddy current which flows in a closed circuit constituted of the first and the second flange members 32, 33 and the cylindrical member 34 at operation, since the cylindrical member 34 for connecting external peripheries of the first and the second flange members 32, 33 is formed of a non-conductive resin, and induction magnetic poles 39L, 39R composed of soft magnetic bodies are supported to the cylindrical member 34. In addition, since the induction magnetic poles 39L, 39R are integrated to the cylindrical member 34 when forming the cylindrical member 34 of resin, not only the number of part items of the cylindrical member 34 itself can be reduced, but also a fixing member for fixing the induction magnetic poles 39L, 39R to the cylindrical member 34 can be dispensed with, thus cutting down the cost by improving the mass productivity of the rotor 13. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a rotor for a rotating electrical machine that is formed in a bowl shape that rotates around an axis and supports a plurality of induction magnetic poles on an outer peripheral portion.

An annular stator having a plurality of armatures and generating a rotating magnetic field is fixed to a casing, and a first rotor that supports a plurality of permanent magnets on the outer periphery is rotatably supported inside the stator, and a plurality of soft magnetic bodies The cylindrical second rotor that supports the magnetic induction magnetic pole is rotatably supported between the stator and the first rotor, so that output can be separately taken out from the first rotor and the second rotor. A shaft output type electric motor is known from Patent Document 1 below.
JP-A-8-111963

  By the way, the second rotor of the two-shaft output motor described in Patent Document 1 is axially extended from the outer peripheral portions of the two disk-shaped first and second rotor frames disposed so as to face each other. A plurality of induction magnetic pole support portions are integrally protruded to each other, and the induction magnetic pole support portions of the first rotor frame and the induction magnetic pole support portions of the second rotor frame are sandwiched between the induction magnetic pole support portions and fixed with bolts. It has a structure. For this reason, the shapes of the first and second rotor frames are complicated, and there is a problem that the mass productivity is reduced and the cost is increased. In addition, the second rotor has two rotor frames and a plurality of rotor frames. Since the connecting portions with both ends of the induction magnetic pole support portion are not insulated, the eddy current generated during operation flows through a closed circuit composed of one rotor frame, the fixed member, the other rotor frame, and the fixed member. Large heat generation and energy loss could occur.

  The present invention has been made in view of the above circumstances, and minimizes eddy currents generated in a rotor of a rotating electrical machine to reduce heat generation and energy loss, and improve mass productivity of the rotor to reduce costs. For the purpose.

  In order to achieve the above object, according to the first aspect of the present invention, a non-conductive material is used between the outer peripheral portions of the first flange member and the second flange member that are rotatably arranged around a common axis. A rotor for a rotating electrical machine is proposed, which is connected by a configured cylindrical member and supports an induction magnetic pole made of a soft magnetic material at a predetermined interval in the circumferential direction around the axis line.

  According to the invention described in claim 2, in addition to the configuration of claim 1, the cylindrical member is made of resin, and the induction magnetic pole is integrated with the cylindrical member when the cylindrical member is molded. A rotor for a rotating electrical machine is proposed.

  According to a third aspect of the present invention, in addition to the configuration of the first or second aspect, a rotor for a rotating electrical machine is proposed in which the induction magnetic pole is exposed on an outer peripheral surface of the cylindrical member. Is done.

  According to a fourth aspect of the present invention, in addition to the configuration of the first or second aspect, the induction magnetic pole is exposed on the inner peripheral surface of the cylindrical member. Proposed.

  According to the invention described in claim 5, in addition to the structure of any one of claims 1 to 4, the cylindrical member is a pair of fixed to the first and second flange members. An annular fixed portion and a plurality of rod-shaped induction magnetic pole support portions that are arranged at a predetermined interval in the circumferential direction around the axis and connect the pair of fixed portions, and between adjacent induction magnetic pole support portions A rotor for a rotating electrical machine is proposed in which the induction magnetic pole is supported.

  According to the invention described in claim 6, in addition to the configuration of any one of claims 1 to 5, a ring made of weak magnetic material is arranged on the outer periphery of the cylindrical member. A rotor for a rotating electrical machine is proposed.

  According to the invention described in claim 7, in addition to the configuration of claim 6, a plurality of the induction magnetic poles are arranged at predetermined intervals in the axial direction, and the plurality of the rings adjacent to the axial direction are arranged. A rotor for a rotating electrical machine characterized by being disposed between induction magnetic poles is proposed.

  According to the invention described in claim 8, in addition to the structure of any one of claims 1 to 7, the first and second flange members are made of a metal material. A rotor for a rotating electrical machine is proposed.

  The first induction magnetic pole 39L and the second induction magnetic pole 39R in the embodiment correspond to the induction magnetic pole of the present invention.

  According to the configuration of the first aspect, the cylindrical member that connects the outer peripheral portions of the first flange member and the second flange member that rotate about the axis is made of a nonconductive material, and the cylindrical member is made of a soft magnetic material. Since the induction magnetic pole is supported at a predetermined interval in the circumferential direction centered on the axis, the first and second flange members are electrically insulated by a cylindrical member that does not flow current, and the first flange member and the second flange are operated during operation. By reducing the eddy current flowing through the closed circuit composed of the flange member and the cylindrical member, heat generation and energy loss associated with the eddy current can be minimized.

  According to the configuration of claim 2, since the induction magnetic pole is integrated with the cylindrical member when the cylindrical member is molded with resin, not only the number of parts of the cylindrical member itself can be reduced by molding, but also the cylindrical member. Therefore, it is possible to reduce the cost by improving the mass productivity of the rotor.

  According to the third aspect of the present invention, since the induction magnetic pole is exposed on the outer peripheral surface of the cylindrical member, it is possible to increase the magnetic efficiency by reducing the air gap on the outer peripheral surface side of the induction magnetic pole.

  According to the fourth aspect of the present invention, since the induction magnetic pole is exposed on the inner peripheral surface of the cylindrical member, the air gap on the inner peripheral surface side of the induction magnetic pole can be reduced to increase the magnetic efficiency.

  According to the fifth aspect of the present invention, the pair of annular fixed portions of the cylindrical member are connected by the plurality of rod-shaped induction magnetic pole support portions arranged at predetermined intervals in the circumferential direction, and between the adjacent induction magnetic pole support portions. Since the induction magnetic pole is supported, the induction magnetic pole can be reliably and easily supported by a simple-shaped cylindrical member.

  Further, according to the configuration of the sixth aspect, since the ring made of the weak magnetic material is arranged on the outer periphery of the cylindrical member, the centrifugal force acting on the cylindrical member with the rotation of the rotor is supported by the ring, so that the cylindrical member Deformation can be suppressed.

  Further, according to the configuration of the seventh aspect, since the ring is arranged between the induction magnetic poles arranged at a predetermined interval in the axial direction, the cylindrical member effectively supports the centrifugal force acting on the plurality of induction magnetic poles by the ring. Can be suppressed.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

  1 to 16 show a first embodiment of the present invention, and FIG. 1 is a front view of the electric motor according to the first embodiment viewed in the axial direction (a view taken along line 1-1 in FIG. 2). 2 is a sectional view taken along line 2-2 in FIG. 1, FIG. 3 is a sectional view taken along line 3-3 in FIG. 2, FIG. 4 is a sectional view taken along line 4-4 in FIG. 6 is a sectional view taken along line 6-6 of FIG. 5, FIG. 7 is a sectional view taken along line 7-7 of FIG. 5, FIG. 8 is a sectional view taken along line 8-8 of FIG. FIG. 10 is an exploded perspective view of the inner rotor, FIG. 11 is a schematic diagram in which the electric motor is developed in the circumferential direction, FIG. 12 is an operation explanatory diagram when the inner rotor is fixed (part 1), and FIG. 14 is an operation explanatory diagram when the inner rotor is fixed (No. 3), and FIG. 15 is an operation explanatory diagram when the outer rotor is fixed (No. 1). FIG. 16 is an operation explanatory view of a case of fixing an outer rotor (part 2).

  As shown in FIG. 9, the electric motor M according to the present embodiment includes a casing 11 having a short octagonal cylindrical shape in the direction of the axis L, and annular first and second stators 12 </ b> L fixed to the inner periphery of the casing 11. 12R, a cylindrical outer rotor 13 that is housed in the first and second stators 12L, 12R and rotates about the axis L, and a cylindrical outer rotor 13 that is housed in the outer rotor 13 and rotates about the axis L The outer rotor 13 and the inner rotor 14 are rotatable relative to the fixed first and second stators 12L and 12R, and the outer rotor 13 and the inner rotor 14 are mutually connected. Relative rotation is possible.

  As shown in FIGS. 1 and 2, the casing 11 includes a bottomed octagonal cylindrical main body portion 15 and an octagonal plate-like lid portion 17 fixed to the opening of the main body portion 15 with a plurality of bolts 16. In the body portion 15 and the lid portion 17, a plurality of openings 15a,.

  As shown in FIGS. 1 to 4 and 9, the first and second stators 12L and 12R are formed by superposing the same structure in the circumferential direction, and one of the first stators 12L is overlapped. The structure will be explained for an example. The first stator 12L includes a plurality of (in the embodiment, 24) first armatures 21L ... around which coils 20 are wound around an outer periphery of a core 18 made of laminated steel plates via an insulator 19. The one armature 21L is integrated by a ring-shaped holder 22 in a state of being coupled in the circumferential direction so as to form an annular shape as a whole. Flange 22a ... projecting radially from one end in the axis L direction of holder 22 is fixed to step 15b (see Fig. 2) on the inner surface of main body 15 of casing 11 with a plurality of bolts 23 ....

  Like the first stator 12L described above, the second stator 12R includes 24 second armatures 21R, and the flanges 22a of the holder 22 are stepped portions 15c on the inner surface of the main body 15 of the casing 11 ( 2), a plurality of bolts 24 are fixed. At this time, the circumferential phases of the first stator 12L and the second stator 12R are shifted from each other by half the pitch of the first and second permanent magnets 52L, 52R,. (See FIG. 4). The first and second armatures 21L, 21R,... Of the first and second stators 12L, 12R to 3 terminals 25, 26, 27 (see FIG. 1) 3 provided on the main body 15 of the casing 11. By supplying the phase alternating current, a rotating magnetic field can be generated in the first and second stators 12L and 12R.

  As shown in FIGS. 2 and 9, the bowl-shaped rotor body 31 of the outer rotor 13 includes first and second disk-shaped first and second flange members 32 and 33 made of iron or steel as a conductive material, A substantially cylindrical cylindrical member 34 made of non-conductive resin is assembled and configured. A first outer rotor shaft 32a protruding on the axis L from the center of the first flange member 32 is rotatably supported on the lid portion 17 of the casing 11 by a ball bearing 35, and the axis L from the center of the second flange member 33. A second outer rotor shaft 33a protruding upward is rotatably supported by the main body 15 of the casing 11 by a ball bearing 36. The second outer rotor shaft 33a serving as the output shaft of the outer rotor 13 passes through the main body portion 15 of the casing 11 and extends to the outside.

  As shown in FIG. 9, the cylindrical member 34 has a pair of annular fixing portions 34a, 34a formed at both ends thereof, and is arranged at equal intervals in the circumferential direction extending in the axis L direction. A plurality of (20 in the embodiment) induction magnetic pole support portions 34b... Connected to the fixing portions 34a, 34a are integrally provided. Nuts 41 are inserted in advance in a pair of fixed portions 34a, 34a connected to both ends of the induction magnetic pole support portions 34b, and bolts 37 penetrating the first and second flange members 32, 33 are attached to the washer 38. Are screwed into the nuts 41 to form a bowl-shaped rotor body 31 in which the cylindrical member 34 and the first and second flange members 32 and 33 are integrated. The bolts 37 and the nuts 41 are preferably made of a weak magnetic material. The reason is that, as is apparent from FIG. 5, the bolts 37 and nuts 41 reach the part constituting the magnetic path.

  At this time, since the cylindrical member 34 is made of non-conductive resin, the first and second flange members 32 and 33 are electrically insulated from each other. Therefore, an electrical closed circuit (an arrow in FIG. 5) configured through the first flange member 32, the induction magnetic pole support 34b of the cylindrical member 34, the second flange member 33 and the induction magnetic pole support 34b of the cylindrical member 34. Reference) can be surely interrupted, thereby preventing eddy currents from occurring in the closed circuit and minimizing heat generation and energy loss.

  As shown in FIGS. 5 to 9, 20 slits extending in parallel to the axis L are formed between the 20 induction magnetic pole support portions 34b of the cylindrical member 34, and each slit is made of a soft magnetic material. The first induction magnetic pole 39L and the second induction magnetic pole 39R are supported. The first and second induction magnetic poles 39L, 39R, ... are integrally inserted when the cylindrical member 34 is molded. The outer peripheral surfaces and inner peripheral surfaces of the first and second induction magnetic poles 39L, 39R,... Are exposed from the outer peripheral surface and the inner peripheral surface of the cylindrical member 34.

  As shown in FIGS. 5 and 8, the first and second induction magnetic poles 39L and 39R are composed of a large number of steel plates stacked in the direction of the axis L, and have a square cross section on both side surfaces along the axis L. Concave portions 39a, 39a are formed, and these concave portions 39a, 39a engage with the convex portions 34c, 34c of the induction magnetic pole support portions 34b,... The second induction magnetic poles 39L and 39R are prevented from falling off in the radial direction.

  As shown in FIGS. 5 and 9, a ring 40 in which a band-shaped metal plate of a weak magnetic material (non-magnetic material) is formed in an annular shape is fitted to the outer periphery of the central portion of the cylindrical member 34. The ring 40 is fitted between the first induction magnetic poles 39L ... and the second induction magnetic poles 39R ..., and the first induction magnetic poles 39L adjacent to the four detent protrusions 40a ... provided at intervals of 90 ° on the side edges thereof. ... is prevented from rotating in the circumferential direction by engaging between them.

  As shown in FIGS. 6 and 7, when the outer rotor 13 rotates, the cylindrical member 34 tries to bend radially outward by the centrifugal force applied to the first and second induction magnetic poles 39L, 39R, By pressing the central portion of the members 34 in the direction of the axis L inward in the radial direction with the ring 40, the deformation of the cylindrical members 34 can be effectively suppressed and the outer rotor 13 can be rotated at high speed. In particular, since the ring 40 is disposed between the first induction magnetic poles 39L ... and the second induction magnetic poles 39R ..., the centrifugal force acting on the first and second induction magnetic poles 39L ... 39R ..., which are heavy in weight, is effectively prevented. Can be supported.

  As shown in FIG. 2, the 1st resolver 42 for detecting the rotation position of the outer rotor 13 is provided so that the 2nd outer rotor shaft 33a of the outer rotor 13 may be enclosed. The first resolver 42 includes a resolver rotor 43 fixed to the outer periphery of the second outer rotor shaft 33a, and a resolver stator 44 fixed to the lid portion 17 of the casing 11 so as to surround the resolver rotor 43. The

  As shown in FIGS. 2 to 4 and 10, the inner rotor 14 includes a rotor body 45 formed in a cylindrical shape, and an inner rotor shaft 47 that passes through a hub 45 a of the rotor body 45 and is fixed by bolts 46. The annular first and second rotor cores 48L and 48R are made of laminated steel plates and are fitted to the outer periphery of the rotor body 45, and the annular spacer 49 is fitted to the outer periphery of the rotor body 45. One end of the inner rotor shaft 47 is rotatably supported by the ball bearing 50 on the axis L inside the second outer rotor shaft 33a, and the other end of the inner rotor shaft 47 is ball bearing inside the first outer rotor shaft 32a. The first outer rotor shaft 32 a and the lid portion 17 of the casing 11 pass through the first outer rotor shaft 32 a and extend outside the casing 11 as an output shaft of the inner rotor 14.

  The first and second rotor cores 48L and 48R fitted to the outer periphery of the rotor body 45 have the same structure, and a plurality (20 in the embodiment) of permanent magnet support holes 48a. 3 and FIG. 4), and first and second permanent magnets 52L... 52R are press-fitted in the direction of the axis L. The polarities of the adjacent first permanent magnets 52L of the first rotor core 48L are alternately reversed, the polarities of the adjacent second permanent magnets 52R of the second rotor core 48R are alternately reversed, and the first rotor core The circumferential phase of the 48L first permanent magnets 52L and the circumferential phase of the second permanent magnets 52R of the second rotor core 48R are shifted from each other by half of their pitch (FIG. 3). And FIG. 4).

  A weak magnetic spacer 49 is fitted in the center of the outer circumference of the rotor body 45 in the axis L direction, and a pair of inner permanent magnet support plates 53 that prevent the first and second permanent magnets 52L, 52R,. , 53 are fitted to each other, the first and second rotor cores 48L, 48R are fitted to the outer sides thereof, and the first and second permanent magnets 52L, 52R,. Magnet support plates 54 and 54 are respectively fitted, and a pair of stopper rings 55 and 55 are fixed to the outside by press-fitting.

  As shown in FIG. 2, a second resolver 56 for detecting the rotational position of the inner rotor 14 is provided so as to surround the inner rotor shaft 47. The second resolver 56 includes a resolver rotor 57 fixed to the outer periphery of the inner rotor shaft 47 and a resolver stator 58 fixed to the lid portion 17 of the casing 11 so as to surround the resolver rotor 57.

  3 and 4, the first armature 21L of the first stator 12L is formed on the outer peripheral surface of the first induction magnetic pole 39L exposed on the outer peripheral surface of the outer rotor 13 through a slight air gap. The inner peripheral surface of the first rotor core 48L of the inner rotor 14 is opposed to the inner peripheral surface of the first induction magnetic pole 39L exposed to the inner peripheral surface of the outer rotor 13 through a slight air gap. opposite. Similarly, the inner peripheral surface of the second armature 21R of the second stator 12R is opposed to the outer peripheral surface of the second induction magnetic poles 39R exposed on the outer peripheral surface of the outer rotor 13 through a slight air gap. The outer peripheral surface of the second rotor core 48R of the inner rotor 14 is opposed to the inner peripheral surface of the second induction magnetic poles 39R exposed on the inner peripheral surface of the rotor 13 with a slight air gap.

  Next, the operation principle of the electric motor M according to the first embodiment having the above configuration will be described.

  FIG. 11 schematically shows a state where the electric motor M is developed in the circumferential direction. 11 are shown first and second permanent magnets 52L, 52R,... Of the inner rotor 14, respectively. The first and second permanent magnets 52L, 52R,..., 52R,... Are alternately arranged with N and S poles at a predetermined pitch P in the circumferential direction (vertical direction in FIG. 11). The two permanent magnets 52R are arranged so as to be shifted by a half of the predetermined pitch P, that is, by a half pitch P / 2.

  11, virtual permanent magnets 21 corresponding to the first and second armatures 21L, 21R,... Of the first and second stators 12L, 12R are arranged at a predetermined pitch P in the circumferential direction. . Actually, the number of first and second armatures 21L, 21R,... Of the first and second stators 12L, 12R is 24, and the first and second permanent magnets 52L, 52R of the inner rotor 14 are each. Since the number of... Is 20, each, the pitch of the first and second armatures 21L, 21R,... Does not coincide with the pitch P of the first, second permanent magnets 52L, 52R,. .

  However, since the first and second armatures 21L,..., 21R each form a rotating magnetic field, the first and second armatures 21L,. It can be replaced with 20 virtual permanent magnets 21. Hereinafter, the first and second armatures 21L, 21R,... Are referred to as first, second virtual magnetic poles 21L, 21R,. The polarities of the first and second virtual magnetic poles 21L, 21R,... Of the virtual permanent magnets 21 ... adjacent to each other in the circumferential direction are alternately reversed, and the first virtual magnetic poles 21L ... The two virtual magnetic poles 21R are shifted by a half pitch P / 2 in the circumferential direction.

  The first and second induction magnetic poles 39L, 39R,... Of the outer rotor 13 are arranged between the first and second permanent magnets 52L, 52R, and the virtual permanent magnets 21,. The first and second induction magnetic poles 39L, 39R are arranged at a pitch P in the circumferential direction, and the first induction magnetic poles 39L and the second induction magnetic poles 39R are aligned in the axis L direction.

  As shown in FIG. 11, when the polarity of the first virtual magnetic pole 21L of the virtual permanent magnet 21 is different from the polarity of the first permanent magnet 52L facing (closest), the second virtual magnetic pole 21R of the virtual permanent magnet 21 The polarity is the same as the polarity of the second permanent magnet 52R facing (closest) to it. When the polarity of the second virtual magnetic pole 21R of the virtual permanent magnet 21 is different from the polarity of the second permanent magnet 52R facing (closest), the polarity of the first virtual magnetic pole 21L of the virtual permanent magnet 21 faces it. It becomes the same as the polarity of the (closest) first permanent magnet 52L (see FIG. 13G).

  First, the first and second stators 12L and 12R (first and second virtual magnetic poles 21L... 21R...) With the inner rotor 14 (first and second permanent magnets 52L... 52R...) Fixed in a non-rotatable state. ) To generate a rotating magnetic field, the operation when the outer rotor 13 (first and second induction magnetic poles 39L, 39R,...) Is rotationally driven will be described. In this case, it is fixed in the order of FIG. 12 (A) → FIG. 12 (B) → FIG. 12 (C) → FIG. 12 (D) → FIG. 13 (E) → FIG. 13 (F) → FIG. The virtual permanent magnets 21 ... rotate downward in the figure with respect to the first and second permanent magnets 52L ... 52R ..., so that the first and second induction magnetic poles 39L ... 39R ... rotate downward in the figure. .

  As shown in FIG. 12A, the first induction magnetic poles 39L are aligned and opposed to the first virtual poles 21L of the first permanent magnets 52L and the virtual permanent magnets 21 that are opposed to each other. The virtual permanent magnets 21 are rotated downward in the drawing from the state where the second induction magnetic poles 39R are shifted by a half pitch P / 2 with respect to the two virtual magnetic poles 21R and the second permanent magnets 52R. At the start of the rotation, the polarities of the first virtual magnetic poles 21L ... of the virtual permanent magnets 21 ... are different from the polarities of the first permanent magnets 52L ... opposite thereto, and the second virtual magnetic poles 21R of the virtual permanent magnets 21 ... The polarity of... Is the same as the polarity of the second permanent magnet 52R.

  Since the first induction magnetic poles 39L ... are disposed between the first permanent magnets 52L ... and the first virtual magnetic poles 21L ... of the virtual permanent magnets 21 ..., the first induction magnetic poles 39L ... The first magnetic lines G1 are generated between the first permanent magnets 52L, the first induction magnetic poles 39L, and the first virtual magnetic poles 21L. Similarly, since the second induction magnetic poles 39R ... are disposed between the second virtual magnetic poles 21R ... and the second permanent magnets 52R ..., the second induction magnetic poles 39R ... are made the second virtual magnetic poles 21R ... and the second permanent magnets 52R. Are magnetized, and second magnetic lines of force G2 are generated between the second virtual magnetic poles 21R, second induction magnetic poles 39R, and second permanent magnets 52R.

  In the state shown in FIG. 12A, the first magnetic lines of force G1 are generated so as to connect the first permanent magnets 52L, the first induction magnetic poles 39L, and the first virtual magnetic poles 21L, and the second magnetic lines of force G2 are circular. The two second permanent magnets 52R ... adjacent to each other in the circumferential direction so as to connect the two second virtual magnetic poles 21R ... adjacent to each other in the circumferential direction and the second induction magnetic poles 39R ... positioned therebetween. It is generated so as to connect the second induction magnetic poles 39R positioned between the two. As a result, in this state, a magnetic circuit as shown in FIG. In this state, since the first magnetic lines of force G1 are linear, no magnetic force that rotates in the circumferential direction acts on the first induction magnetic poles 39L. Further, the bending degree and the total magnetic flux amount of the two second magnetic lines G2 between each of the two second virtual magnetic poles 21R and the second induction magnetic poles 39R that are adjacent to each other in the circumferential direction are equal to each other, and similarly in the circumferential direction. The bending degree and the total magnetic flux amount of the two second magnetic lines of force G2 between the two adjacent second permanent magnets 52R and the second induction magnetic poles 39R are also equal and balanced. Therefore, no magnetic force that rotates in the circumferential direction acts on the second induction magnetic poles 39R.

  When the virtual permanent magnets 21 are rotated from the position shown in FIG. 12A to the position shown in FIG. 12B, the second virtual magnetic poles 21R, second induction magnetic poles 39R, and second permanent magnets 52R are turned. The second magnetic field lines G2 that are connected are generated, and the first magnetic field lines G1 between the first induction magnetic poles 39L and the first virtual magnetic poles 21L are bent. Accordingly, a magnetic circuit as shown in FIG. 14B is configured by the first and second magnetic lines of force G1, G2.

  In this state, although the degree of bending of the first magnetic lines of force G1 is small, the total amount of magnetic flux is large, so that a relatively strong magnetic force acts on the first induction magnetic poles 39L. Accordingly, the first induction magnetic poles 39L are driven with a relatively large driving force in the rotation direction of the virtual permanent magnets 21, that is, the magnetic field rotation direction, and as a result, the outer rotor 13 rotates in the magnetic field rotation direction. Further, although the degree of bending of the second magnetic lines of force G2 is large, the total magnetic flux amount is small, so that a relatively weak magnetic force acts on the second induction magnetic poles 39R, so that the second induction magnetic poles 39R are relatively in the magnetic field rotation direction. Driven with a small driving force, the outer rotor 13 rotates in the direction of magnetic field rotation.

  Next, when the virtual permanent magnet 21 sequentially rotates from the position shown in FIG. 12B to the positions shown in FIGS. 12C, 12D, 13E, and 13F, the first induction magnetic pole 39L. .. And the second induction magnetic poles 39R are driven in the magnetic field rotation direction by the magnetic force caused by the first and second magnetic lines of force G1, G2, respectively. As a result, the outer rotor 13 rotates in the magnetic field rotation direction. In the meantime, the magnetic force acting on the first induction magnetic poles 39L is gradually weakened by decreasing the total magnetic flux amount although the bending degree of the first magnetic lines of force G1 is large, and the first induction magnetic poles 39L are magnetically rotated. The driving force for driving in the direction gradually decreases. Further, the magnetic force acting on the second induction magnetic poles 39R is gradually increased as the total magnetic flux amount is increased, although the degree of bending of the second magnetic lines G2 is reduced, and the second induction magnetic poles 39R are made to move in the magnetic field rotation direction. The driving force to drive gradually increases.

  And while the virtual permanent magnet 21 rotates from the position shown in FIG. 13 (E) to the position shown in FIG. 13 (F), the second magnetic line of force G2 is bent and the total amount of magnetic flux is close to the maximum. As a result, the strongest magnetic force acts on the second induction magnetic poles 39R ..., and the driving force acting on the second induction magnetic poles 39R ... becomes maximum. Thereafter, as shown in FIG. 13 (G), the virtual permanent magnet 21 rotates by the pitch P from the initial position of FIG. 12 (A), whereby the first, second virtual magnetic poles 21L,. When 21R rotates to a position opposite to the first and second permanent magnets 52L, 52R, respectively, the state shown in FIG. 12A is reversed to the left and right, and the outer rotor 13 is moved in the circumferential direction only at that moment. The rotating magnetic force stops working.

  When the virtual permanent magnet 21 further rotates from this state, the first and second induction magnetic poles 39L, 39R,... Are driven in the magnetic field rotation direction by the magnetic force caused by the first and second magnetic lines of force G1, G2. The rotor 13 rotates in the magnetic field rotation direction. At that time, while the virtual permanent magnet 21 is rotated again to the position shown in FIG. 12A, the magnetic force acting on the first induction magnetic poles 39L,... Reverses the degree of bending of the first magnetic line G1. However, it becomes stronger as the total magnetic flux increases, and the driving force acting on the first induction magnetic poles 39L becomes larger. On the other hand, the magnetic force acting on the second induction magnetic poles 39R ... becomes weaker as the total amount of magnetic flux decreases but the driving force acting on the second induction magnetic poles 39R ... although the degree of bending of the second magnetic lines G2 increases. Becomes smaller.

  12A and 13G, as the virtual permanent magnet 21 rotates by the pitch P, the first and second induction magnetic poles 39L... 39R. Since it rotates only by the pitch P / 2, the outer rotor 13 rotates at a speed that is 1/2 of the rotational speed of the rotating magnetic field of the first and second stators 12L, 12R. This is because the first and second induction magnetic poles 39L, 39R,... Are connected to the first permanent magnet 52L, which is connected by the first magnetic lines G1, by the action of the magnetic force caused by the first and second magnetic lines G1, G2. This is to rotate while maintaining a state of being located in the middle of the first virtual magnetic pole 21L, and in the middle of the second permanent magnet 52R connected by the second magnetic field line G2 and the second virtual magnetic pole 21R.

  Next, the operation of the electric motor M when the inner rotor 14 is rotated while the outer rotor 13 is fixed will be described with reference to FIGS. 15 and 16.

  First, as shown in FIG. 15A, the first induction magnetic poles 39L are opposed to the first permanent magnets 52L, and the second induction magnetic poles 39R are adjacent to each other two second permanent magnets 52R. .., The first and second rotating magnetic fields are rotated downward in the figure. At the start of the rotation, the polarities of the first virtual magnetic poles 21L ... are made different from the polarities of the first permanent magnets 52L ... facing each other, and the polarities of the second virtual magnetic poles 21R ... The same as the polarity of the two permanent magnets 52R.

  From this state, when the virtual permanent magnets 21 are rotated to the positions shown in FIG. 15B, the first magnetic lines G1 between the first induction magnetic poles 39L and the first virtual magnetic poles 21L are bent, and When the second virtual magnetic poles 21R approach the second induction magnetic poles 39R, second magnetic lines of force G2 that connect the second virtual magnetic poles 21R, the second induction magnetic poles 39R, and the second permanent magnets 52R are generated. As a result, in the first and second permanent magnets 52L, 52R, the virtual permanent magnet 21, and the first and second induction magnetic poles 39L, 39R, the magnetic circuit as shown in FIG. Composed.

  In this state, although the total magnetic flux amount of the first magnetic lines G1 between the first permanent magnets 52L and the first induction magnetic poles 39L is high, the first magnetic lines G1 are straight, so the first induction magnetic poles 39L. However, no magnetic force is generated to rotate the first permanent magnets 52L. In addition, since the distance between the second permanent magnets 52R ... and the second virtual magnetic poles 21R ... having different polarities is relatively long, the second magnetic field lines between the second induction magnetic poles 39R ... and the second permanent magnets 52R ... Although the total magnetic flux amount of G2 is relatively small, the bending degree is large, so that a magnetic force is applied to the second permanent magnets 52R... To bring them closer to the second induction magnetic poles 39R. As a result, the second permanent magnets 52R are driven together with the first permanent magnets 52L in the rotational direction of the virtual permanent magnets 21, that is, in the direction opposite to the magnetic field rotational direction (upward in FIG. 12). Rotate toward the position shown in As a result, the inner rotor 14 rotates in the direction opposite to the magnetic field rotation direction.

  While the first and second permanent magnets 52L, 52R,... Rotate from the position shown in FIG. 15B toward the position shown in FIG. Rotate toward the position shown in As described above, when the second permanent magnets 52R approach the second induction magnetic poles 39R ..., the degree of bending of the second magnetic lines G2 between the second induction magnetic poles 39R ... and the second permanent magnets 52R ... becomes small. However, as the virtual permanent magnets 21 further approach the second induction magnetic poles 39R, the total magnetic flux amount of the second magnetic lines of force G2 increases. As a result, in this case as well, a magnetic force is applied to the second permanent magnets 52R... So as to approach the second induction magnetic poles 39R..., Thereby causing the second permanent magnets 52R. .. And the magnetic field rotation direction.

  Further, as the first permanent magnets 52L rotate in the direction opposite to the magnetic field rotation direction, the first permanent magnetic lines G1 between the first permanent magnets 52L ... and the first induction magnetic poles 39L ... A magnetic force is applied to the magnets 52L to bring them close to the first induction magnetic poles 39L. However, in this state, the magnetic force caused by the first magnetic field line G1 is weaker than the magnetic force caused by the second magnetic field line G2 because the degree of bending of the first magnetic field line G1 is smaller than that of the second magnetic field line G2. As a result, the second permanent magnets 52R are driven together with the first permanent magnets 52L in a direction opposite to the magnetic field rotation direction by the magnetic force corresponding to the difference between the two magnetic forces.

  As shown in FIG. 15D, the distance between the first permanent magnets 52L ... and the first induction magnetic poles 39L ... and the distance between the second induction magnetic poles 39R ... and the second permanent magnets 52R ... Are substantially equal to each other, the total magnetic flux amount and the degree of bending of the first magnetic lines G1 between the first permanent magnets 52L ... and the first induction magnetic poles 39L ... are the second induction magnetic poles 39R ... and the second permanent magnets 52R. Are approximately equal to the total amount of magnetic flux and the degree of bending of the second magnetic field lines G2 between them.

  As a result, the first and second permanent magnets 52L, 52R,... Are temporarily not driven when the magnetic forces caused by the first and second magnetic lines G1, G2 are substantially balanced with each other.

  When the virtual permanent magnets 21... Rotate from this state to the position shown in FIG. 16 (E), the generation state of the first magnetic lines of force G1 changes, and a magnetic circuit as shown in FIG. 16 (F) is configured. As a result, the magnetic force caused by the first magnetic field lines G1 hardly acts so as to bring the first permanent magnets 52L close to the first induction magnetic poles 39L, so that the second permanent magnets are caused by the magnetic force caused by the second magnetic field lines G2. 52R, together with the first permanent magnets 52L, are driven in the direction opposite to the magnetic field rotation direction to the position shown in FIG.

  When the virtual permanent magnets 21 are slightly rotated from the position shown in FIG. 16G, the first magnetic lines G1 between the first permanent magnets 52L and the first induction magnetic poles 39L are reversed from the above. The resulting magnetic force acts on the first permanent magnets 52L, so as to be close to the first induction magnetic poles 39L, so that the first permanent magnets 52L ... together with the second permanent magnets 52R ... Driven in the reverse direction, the inner rotor 14 rotates in the direction opposite to the magnetic field rotation direction. When the virtual permanent magnets 21 are further rotated, the magnetic force resulting from the first magnetic field lines G1 between the first permanent magnets 52L and the first induction magnetic poles 39L, the second induction magnetic poles 39R and the second permanent magnets 52R and so on. The first permanent magnets 52L are driven together with the second permanent magnets 52R in a direction opposite to the magnetic field rotation direction by a magnetic force corresponding to a difference in magnetic force caused by the second magnetic field lines G2 between the first permanent magnet 52L and the second permanent magnet 52R. After that, when the magnetic force due to the second magnetic field lines G2 hardly acts so as to bring the second permanent magnets 52R to the second induction magnetic poles 39R, the first permanent magnets 52L are caused by the magnetic force due to the first magnetic field lines G1. Are driven together with the second permanent magnets 52R.

  As described above, with the rotation of the first and second rotating magnetic fields, the magnetic force caused by the first magnetic field lines G1 between the first permanent magnets 52L and the first induction magnetic poles 39L, and the second induction magnetic poles 39R. The magnetic force caused by the second magnetic field line G2 between the first permanent magnets 52R and the second permanent magnets 52R, and the magnetic force corresponding to the difference between these magnetic forces are applied to the first and second permanent magnets 52L, 52R, that is, the inner rotor. 14, the inner rotor 14 rotates in the direction opposite to the magnetic field rotation direction. In addition, when the magnetic force, that is, the driving force acts alternately on the inner rotor 14 as described above, the torque of the inner rotor 14 becomes substantially constant.

  In this case, the inner rotor 14 rotates in reverse at the same speed as the first and second rotating magnetic fields. This is because the first and second induction magnetic poles 39L, 39R,... Are intermediate between the first permanent magnets 52L, and the first virtual magnetic poles 21L, by the action of the magnetic force caused by the first and second magnetic lines of force G1, G2. , And the second permanent magnets 525L,..., 52R... Rotate while maintaining the state of being positioned between the second permanent magnets 52R.

  As described above, the case where the inner rotor 14 is fixed and the outer rotor 13 is rotated in the magnetic field rotation direction and the case where the outer rotor 13 is fixed and the inner rotor 14 is rotated in the direction opposite to the magnetic field rotation direction have been described separately. Of course, both the inner rotor 14 and the outer rotor 13 can be rotated in opposite directions.

  As described above, when rotating either one of the inner rotor 14 and the outer rotor 13 or both the inner rotor 14 and the outer rotor 13, depending on the relative rotational positions of the inner rotor 14 and the outer rotor 13, The magnetization state of the first and second induction magnetic poles 39L, 39R,... Can be changed without causing slippage, and functions as a synchronous machine, so that the efficiency can be increased. Further, the numbers of the first virtual magnetic poles 21L, the first permanent magnets 52L, and the first induction magnetic poles 39L are set to be the same, and the second virtual magnetic poles 21R, the second permanent magnets 52R, and the second induction magnetic poles. 39R... Are set to be equal to each other, so that the torque of the electric motor M can be sufficiently obtained when either the inner rotor 14 or the outer rotor 13 is driven.

  Thus, according to the present embodiment, the cylindrical member 34 of the outer rotor 13 is integrally molded with resin, so that not only the number of parts of the cylindrical member 34 itself can be reduced, but also the cylindrical member 34 is molded. In this case, the first and second induction magnetic poles 39L, 39R,... Are embedded and fixed therein, so that the first and second induction magnetic poles 39L, 39R,. This eliminates the need for the fixing member, thereby improving the mass productivity of the outer rotor 13 and reducing the cost.

  Since the first and second induction magnetic poles 39L, 39R are exposed on the outer peripheral surface and the inner peripheral surface of the cylindrical member 34, the first and second armatures 21L, ... of the first and second stators 12L, 12R. Magnetic efficiency can be increased by reducing the air gap between 21R ... and the air gap between the first and second permanent magnets 52L ... 52R ... of the inner rotor 14.

  Next, a second embodiment of the present invention will be described with reference to FIG.

  In the first embodiment, the outer peripheral surface and inner peripheral surface of the first and second induction magnetic poles 39L, 39R,... Supported between the adjacent induction magnetic pole support portions 34b of the cylindrical member 34 are exposed. In the second embodiment, the outer peripheral surfaces and inner peripheral surfaces of the first and second induction magnetic poles 39L, 39R,... Are completely covered with a thin resin film 34d, which bridges between the adjacent induction magnetic pole support portions 34b. Is not visible from the outside. With this structure, there is no possibility that the first and second induction magnetic poles 39L, 39R,... Jump out to the outside due to centrifugal force, and the induction magnetic pole support 34b, and the first, second induction magnetic poles 39L, 39R,. There is no need to let them.

  The embodiments of the present invention have been described above, but various design changes can be made without departing from the scope of the present invention.

  For example, although the electric motor M is illustrated in the embodiment, the present invention provides a generator for generating an electromotive force in the stator by fixing one of the outer rotor and the inner rotor and rotating the other, and a permanent magnet in the stator. The present invention can also be applied to a so-called magnetic gear that transmits a driving force between three members, an outer rotor, an inner rotor, and a stator.

  In the embodiment, the stators 12L, 12R arranged on the radially outer side are provided with the armatures 21L,..., 21R, and the inner rotor 14 arranged on the radially inner side are provided with the permanent magnets 52L,. The positions of the children 21L, 21R, and the permanent magnets 52L, 52R, may be reversed.

  In the embodiment, resin is used for the cylindrical member 34 of the outer rotor 13, but any non-conductive material other than resin can be used.

  In the embodiment, the first and second flange members 32, 33 and the cylindrical member 34 are fixed by bolts 37, but the fixing means is not limited to the bolts 37, but caulking, press fitting, rivets, clips. Any means such as welding can be employed.

The front view which looked at the electric motor of a 1st embodiment in the direction of an axis (1-1 line arrow line view of Drawing 2) 2-2 sectional view of FIG. 3-3 sectional view of FIG. Sectional view along line 4-4 in FIG. View taken along line 5-5 in FIG. 6-6 sectional view of FIG. Sectional view along line 7-7 in FIG. 8-8 sectional view of FIG. Exploded perspective view of electric motor Disassembled perspective view of inner rotor Schematic diagram of electric motor deployed in the circumferential direction Operation explanatory diagram when the inner rotor is fixed (Part 1) Operation explanatory diagram when the inner rotor is fixed (Part 2) Operation explanatory diagram when the inner rotor is fixed (Part 3) Explanatory drawing of operation when outer rotor is fixed (Part 1) Operation explanatory diagram when the outer rotor is fixed (Part 2) The figure corresponding to the said FIG. 8 based on 2nd Embodiment.

Explanation of symbols

32 First flange member 33 Second flange member 34 Cylindrical member 34a Fixed portion 34b Induction magnetic pole support portion 39L First induction magnetic pole 39R Second induction magnetic pole 40 Ring L Axis line

Claims (7)

  A cylindrical member (34) made of a non-conductive material is connected between the outer peripheral portions of the first flange member (32) and the second flange member (33) that are rotatably arranged around a common axis (L), A rotor for a rotating electrical machine, wherein an induction magnetic pole (39L, 39R) made of a soft magnetic material is supported on the cylindrical member (34) at a predetermined interval in a circumferential direction centering on the axis (L).   The cylindrical member (34) is made of resin, and the induction magnetic pole (39L, 39R) is integrated with the cylindrical member (34) when the cylindrical member (34) is molded. The rotor for rotating electrical machines described in 1.   The rotor for a rotating electrical machine according to claim 1 or 2, wherein the induction magnetic pole (39L, 39R) is exposed on an outer peripheral surface of the cylindrical member (34).   The rotor for a rotating electrical machine according to claim 1 or 2, wherein the induction magnetic pole (39L, 39R) is exposed on an inner peripheral surface of the cylindrical member (34).   The cylindrical member (34) has a pair of annular fixing portions (34a) fixed to the first and second flange members (32, 33) and a predetermined interval in a circumferential direction centering on the axis (L). And a plurality of rod-shaped induction magnetic pole support portions (34b) connecting the pair of fixed portions (34a), and the induction magnetic poles (39L, 39R) between adjacent induction magnetic pole support portions (34b). The rotor for rotating electrical machines according to any one of claims 1 to 4, wherein the rotor is supported.   The rotor for a rotating electrical machine according to any one of claims 1 to 5, wherein a ring (40) made of a weak magnetic material is disposed on an outer periphery of the cylindrical member (34).   A plurality of the induction magnetic poles (39L, 39R) are arranged at a predetermined interval in the axis (L) direction, and the ring (40) The rotor for a rotating electrical machine according to claim 6, wherein the rotor is disposed between them.

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