JP2016220513A - Vehicular rotary electrical machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicular rotary electrical machine that makes leakage magnetic flux less than before.SOLUTION: Each claw-like magnetic pole 12m has an air gap enlargement part 12d, having an air gap larger than an air gap for a tip part 11te of a tooth 11t, formed at least partially at both peripheral side parts. When an inter-magnetic-pole center position CL1 between peripherally adjacent claw-like magnetic poles 12m is aligned with a teeth center position CL2 of the tip part 11te when viewed from a radial direction, the tip part of the claw-like magnetic pole 12m does not overlap with each radial end 12c of an adjacent claw-like magnetic pole 12m, and overlaps with at least a part of each air gap enlargement part 12d of the peripherally adjacent claw-like magnetic pole 12m. A peripheral distance τ between the radial end 12c and tip part 11te satisfies 3δ≤τ≤15δ, where δ is the air gap. A vehicular rotary electrical machine is formed within a range of 0.20≤L1/L2≤0.71, where L1 is an end face claw tip width and L2 is an end face claw root width.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a vehicular rotating electrical machine including a stator and a rotor.

  Conventionally, an example of a technique related to an AC generator for a vehicle that aims to reduce the amount of reactive magnetic flux flowing between adjacent claw-shaped magnetic poles via teeth and reduce magnetic noise has been disclosed (for example, Patent Documents). 1). In this vehicle alternator, an air gap enlarged surface is formed on the outer diameter side of the claw-shaped magnetic pole, and the circumferential center of the magnetic pole coincides with the circumferential center of the tip of the tooth when viewed from the radial direction. The tip of the teeth is configured not to overlap the outermost diameter surface of the claw-shaped magnetic pole and to overlap a part of the air gap enlarged surface. When the air gap is δ and the circumferential distance between the outermost diameter surface and the tip of the tooth is τ, 0 <τ <3δ is established.

JP 2002-058220 A

  However, even if the circumferential distance between the outermost surface and the tooth tip is 0 <τ <3δ, there is a problem that there is a leakage magnetic flux flowing between the claw-shaped magnetic poles via the tooth tip. There is. In addition, since the area of the outermost surface of the claw-shaped magnetic pole decreases, there is a problem that the magnetic resistance of the magnetic circuit increases and the generated magnetic flux decreases in the first place. Furthermore, the claw-shaped magnetic pole is not properly chamfered, and there is a portion where the fluctuation of the magnetic flux is abrupt.

  The present invention has been made in view of such a point, and a first object is to reduce the leakage magnetic flux as compared with the prior art. The second purpose is to increase the magnetic flux generated by the claw-shaped magnetic poles as compared with the conventional case. The third object is to reduce the magnetic noise as compared with the prior art.

  The invention made in order to solve the above problems includes a stator core (11b) having a slot provided by a plurality of teeth (11t) extending in the radial direction at intervals in the circumferential direction, and a fixing incorporated in the slot. A stator (11) having a child winding (11a) and tapered claw-shaped magnetic poles (12m, 12ma, 12mb) are provided at a predetermined pitch in the circumferential direction, and are opposed to mesh with the claw-shaped magnetic poles. A pair of pole cores (12a, 12a, 12a, 12a, 12a, 12b), and a vehicular rotating electrical machine (10) including a rotor (12) having a field coil provided so as to be covered with the claw-shaped magnetic pole, each of the claw-shaped magnetic poles is An air gap enlarged portion (12d) having an air gap larger than the air gap with respect to the tip end portion of the teeth is formed in at least a part of both sides in the circumferential direction, and is adjacent to the circumferential direction when viewed from the radial direction. When the center position (CL1) between the magnetic poles that is the center of the claw-shaped magnetic poles and the tooth center position (CL2) that is the center of the tip of the teeth coincide with each other, the tips of the claw-shaped magnetic poles are adjacent to the claw Configured to overlap with at least a part of each of the air gap enlarged portions of the claw-shaped magnetic poles adjacent to each other in the circumferential direction without overlapping with the radial ends of each of the magnetic poles, , And the air gap is δ, and the air gap is δ, the end claw tip width is L1, and the end claw root width is L. When the, characterized in that it is formed in a range of 0.20 ≦ L1 / L2 ≦ 0.71.

  According to this configuration, the circumferential distance between the radial end portion of the claw-shaped magnetic pole and the tip end portion of the tooth is ensured within the range of 3δ ≦ τ ≦ 15δ, so that the leakage magnetic flux can be reduced as compared with the conventional case. . Since the claw-shaped magnetic pole is formed within the range of 0.20 ≦ L1 / L2 ≦ 0.71 and the area of the end face of the claw-shaped magnetic pole is increased, the amount of generated magnetic flux can be increased as compared with the conventional case. The output can be improved by a synergistic effect of the reduction of the leakage magnetic flux and the increase of the generated magnetic flux.

  The “rotating electric machine” is arbitrary as long as it is a device having a rotating part (for example, a shaft or a shaft). For example, a generator, a motor, a motor generator, and the like are applicable. The “rotor” is formed in a circular shape (including an annular shape and a cylindrical shape). The “stator winding” is optional as long as it has three or more phases. The “claw-shaped magnetic pole” may be composed of a soft magnetic material, a magnet, or a combination of a soft magnetic material and a magnet.

It is a partial cross section figure which shows typically the 1st structural example of a rotary electric machine. It is a top view which shows typically the 1st structural example of the stator seen from the axial direction. It is a perspective view which shows typically the 1st structural example concerning a part of rotor. It is a schematic diagram which shows the 1st structural example of a tooth | gear and a claw-shaped magnetic pole. It is a graph which shows the example of a relationship between a circumferential direction distance and an output ratio. It is a graph which shows the example of a relationship between a width ratio and an output ratio. It is a schematic diagram which shows the 2nd structural example of a tooth | gear and a claw-shaped magnetic pole. It is a schematic diagram which shows the structural example of the claw-shaped magnetic pole seen from the axial direction. It is a schematic diagram which shows the 3rd structural example of a tooth | gear and a claw-shaped magnetic pole. It is a schematic diagram which shows the structural example of the claw-shaped magnetic pole seen from the axial direction. It is a graph which shows the example of a relationship between the angle of an air gap expansion part, and an output ratio. It is a schematic diagram which shows the 4th structural example of a tooth | gear and a claw-shaped magnetic pole. It is a schematic diagram which shows the 5th structural example of a tooth | gear and a claw-shaped magnetic pole. It is a schematic diagram which shows the structural example of the stator and claw-shaped magnetic pole seen from the axial direction. It is a schematic diagram which expands and shows the structural example of the stator seen from radial direction in the circumferential direction. It is a schematic diagram which shows the 6th structural example of a tooth | gear and a claw-shaped magnetic pole. It is a schematic diagram which shows the 7th structural example of a tooth | gear and a claw-shaped magnetic pole. It is a partial cross section figure which shows typically the 2nd structural example of a rotary electric machine. It is a top view which shows typically the 2nd structural example of the stator seen from the axial direction. It is a perspective view which shows typically the 2nd structural example concerning a part of rotor. It is a perspective view which shows typically the 3rd structural example concerning a part of rotor. It is a schematic diagram which shows the 8th structural example of a tooth | gear and a claw-shaped magnetic pole.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. Note that unless otherwise specified, “connecting” means electrically connecting. Each figure shows elements necessary for explaining the present invention, and does not necessarily show all actual elements. When referring to directions such as up, down, left and right, the description in the drawings is used as a reference. The alphabetic character of the sign means different elements in upper case and lower case. “Fix” is optional as long as the object can be fixed, and the fixing method is not limited. “Annular” includes cylindrical. Hereinafter, for the sake of simplicity, the “vehicle rotating electric machine” is simply referred to as “rotating electric machine”. The “axial direction” may be the axial direction itself or a direction intersecting the axial direction (slanting direction). “Outer diameter side” means the outer side or outer peripheral side in the radial direction, and “inner diameter side” means the inner side or inner peripheral side in the radial direction.

[Embodiment 1]
The first embodiment will be described with reference to FIGS. A rotating electrical machine 10 illustrated in FIG. 1 is an inner rotor type generator, and includes a stator 11, a rotor 12, a cooling fan 14, a shaft 17, and the like in a housing 13. 1 is a cross-sectional view in which the pole half 12a is cut off and the lower half in FIG. 1 is cut off the pole core 12b.

  The housing 13 may be formed in any shape as long as it can accommodate the above-described elements. The housing 13 in the configuration example illustrated in FIG. 1 includes a front housing 13F, a rear housing 13R, and the like. The housing 13 is provided with a cooling air discharge hole 13a, a cooling air suction hole 13b, and the like. The housing 13 is also called a frame or a housing. Although not shown, slip rings, rectifiers, pulleys, and the like may be accommodated.

  The stator 11 includes a stator winding 11a, a stator core 11b, and the like. The stator winding 11a is a winding of three or more phases, and is housed and incorporated in the slot 11s (see FIG. 2). A specific configuration example of the stator core 11b will be described later (see FIG. 2). The rotor 12 is disposed via the air gap G between the rotor 12 and the stator 11 (specifically, the teeth 11t of the stator core 11b). The size of the air gap G may be set arbitrarily. A specific configuration example of the rotor 12 will be described later (see FIG. 3).

  The plurality of cooling fans 14 is an example of a cooling unit. Each cooling fan 14 is fixed to the axial end surface of the rotor 12 close to the stator winding 11a. As the rotor 12 rotates, the cooling fan 14 sucks cooling air from the cooling air suction hole 13b and discharges cooling air from the cooling air discharge hole 13a. When the cooling air flows, the entire rotating electrical machine 10 including the stator 11 (particularly the stator winding 11a) can be cooled.

  The shaft 17 is rotatably supported because the bearing 15 is interposed between the shaft 17 and the housing 13. The shaft 17 is also a rotating body that is directly or indirectly fixed to the rotor 12 and rotates together with the rotor 12.

  The stator core 11b shown in FIG. 2 is a semi-closed slot type, and includes a plurality of teeth 11t, a yoke 11y, and the like. The yoke 11y may be formed in an arbitrary shape, and in this embodiment, it is formed in an annular shape. The plurality of teeth 11t are formed to extend in the radial direction from the yoke 11y at intervals in the circumferential direction. The teeth 11t and the yoke 11y may be integrally formed as illustrated, or may be formed separately and fixed. A space formed between the teeth 11t adjacent to each other in the circumferential direction becomes a slot 11s that accommodates the stator winding 11a. That is, the stator core 11b is provided with a slot 11s by a plurality of teeth 11t.

  The rotor 12 shown in FIG. 3 has a pair of pole cores 12a and 12b, a field coil 16, and the like. The pole core 12a has a plurality of claw-shaped magnetic poles 12ma, a plurality of U-shaped grooves 12au, and the like. The plurality of claw-shaped magnetic poles 12ma are provided circumferentially at the outer diameter side end portion, and are tapered from the outer diameter side end portion at a predetermined pitch. The pole core 12b has a plurality of claw-shaped magnetic poles 12mb, a plurality of U-shaped grooves 12bu, and the like. The plurality of claw-shaped magnetic poles 12mb are provided circumferentially at the outer diameter side end, and are tapered from the outer diameter side end at a predetermined pitch. The predetermined pitch is appropriately set according to the number of claw-shaped magnetic poles. Both the claw-shaped magnetic poles 12ma and 12mb correspond to the claw-shaped magnetic pole 12m. The plurality of claw-shaped magnetic poles 12ma and the plurality of claw-shaped magnetic poles 12mb are alternately provided to face each other so as to mesh with each other. The pole cores 12a and 12b and the claw-shaped magnetic poles 12ma and 12mb are formed of a soft magnetic material. The U-shaped grooves 12au and 12bu are cut toward the center side to such an extent that magnetic flux leakage from the claw-shaped magnetic poles 12ma and 12mb does not occur. The field coil 16 is provided so as to be covered with the pole cores 12a and 12b and the claw-shaped magnetic poles 12ma and 12mb. When the field coil 16 is energized, the claw-shaped magnetic poles 12ma and 12mb are magnetized with N or S poles.

  A configuration example of the claw-shaped magnetic pole 12ma and the claw-shaped magnetic pole 12mb adjacent in the circumferential direction will be described with reference to FIG. The claw-shaped magnetic pole 12ma is included in a plurality of claw-shaped magnetic poles 12ma formed extending from the pole core 12a. The claw-shaped magnetic pole 12mb is included in a plurality of claw-shaped magnetic poles 12mb formed extending from the pole core 12b. The number of claw-shaped magnetic poles 12ma and 12mb may be set arbitrarily. The form of the claw-shaped magnetic poles 12ma and 12mb is the same in the second and subsequent embodiments.

  The center position CL1 between the magnetic poles indicated by the one-dot chain line in FIG. 4 is the center between the claw-shaped magnetic pole 12ma and the claw-shaped magnetic pole 12mb. Similarly, the tooth center position CL2 indicated by the alternate long and short dash line is the center of the tooth 11t. That is, FIG. 4 shows a state where the center position CL1 between the magnetic poles and the tooth center position CL2 coincide. The claw-shaped magnetic pole 12ma and the claw-shaped magnetic pole 12mb have the same shape except that the axial directions are opposite. Therefore, unless otherwise specified, the claw-shaped magnetic pole 12ma will be described below as a representative.

  The claw-shaped magnetic pole 12ma has a radial end portion 12c, a first portion 12d1, a root portion 12e, and the like. The radial end 12c is a part facing the tip 11te of the tooth 11t, and is formed in a planar shape (planar or curved) toward the tip in the axial direction shown in the drawing. The radial end 12c is a portion that protrudes most in the radial direction (in the present embodiment, on the outer diameter side) of the rotor 12. The radial end portion 12c is formed such that the tip end side in the axial direction shown in the drawing is the end face claw tip width L1, and the base side in the axial direction shown in the drawing is formed with the end face claw root width L2. The claw-shaped magnetic pole 12ma is preferably formed within a range of 0.20 ≦ L1 / L2 ≦ 0.71 (see FIG. 5). The root portion 12e is a portion that stands up from the pole core 12a.

  The first portion 12d1 is a part of the air gap enlarged portion 12d and is formed on at least a part of both sides in the circumferential direction of the claw-shaped magnetic pole 12ma. The first portion 12d1 is formed so as to have an air gap (that is, a circumferential distance τ) larger than the air gap G with respect to the illustrated tooth 11t (tip portion). The first portion 12d1 may be formed within a range of 3δ ≦ τ ≦ 15δ when the circumferential distance between the radial end portion 12c and the tooth 11t is τ and the air gap G is δ (see FIG. 6). . As long as it forms within the said range, the shape of the 1st site | part 12d1 is not ask | required. That is, it may be a flat surface, a curved surface, or an uneven shape.

  The claw-shaped magnetic pole 12ma and the claw-shaped magnetic pole 12mb are configured such that the axial tip portion applied to one claw-shaped magnetic pole does not overlap the radial end portion 12c applied to the other claw-shaped magnetic pole. Furthermore, the claw-shaped magnetic pole 12ma and the claw-shaped magnetic pole 12mb are configured such that the first portion 12d1 applied to one claw-shaped magnetic pole and the first portion 12d1 applied to the other claw-shaped magnetic pole overlap at least partially.

  FIG. 5 and FIG. 6 show a comparison between the output of the rotating electrical machine 10 configured as described above and the output of the vehicle alternator described in Patent Document 1 (hereinafter simply referred to as “conventional technology”). Will be described with reference to FIG. First, FIG. 5 shows the output ratio Pr1 when the output is measured by changing the circumferential distance τ. The output ratio Pr1 is the output of the rotating electrical machine 10 when the output of the prior art is “1”. The “output” in this embodiment is a power generation output (that is, power output).

  According to the characteristic line SC1 shown in FIG. 5, when the claw-shaped magnetic poles 12ma and 12mb are formed within the range of the circumferential distance τ of 3δ ≦ τ ≦ 15δ, the output is higher than that of the prior art. The claw-shaped magnetic poles 12ma and 12mb may be formed so as to satisfy τa ≦ τ ≦ τb, where Pra is an output ratio obtained based on a desired output. The circumferential distances τa and τb are numerical values satisfying 3δ <τa <τb <15δ. In this way, an output of the output ratio Pra or higher can be obtained with certainty.

  Next, FIG. 6 shows the output ratio Pr2 when the output is measured by changing the width ratio Lr (= L1 / L2) obtained by dividing the end face nail tip width L1 by the end face nail root width L2. Similarly to the output ratio Pr1, the output ratio Pr2 is the output of the rotating electrical machine 10 when the output of the prior art is “1”.

  According to the characteristic line SC2 shown in FIG. 6, when the claw-shaped magnetic poles 12ma and 12mb are formed within the range where the width ratio Lr is 0.20 ≦ Lr1 ≦ 0.71, the output is higher than that of the prior art. The claw-shaped magnetic poles 12ma and 12mb are preferably formed so as to satisfy Lra ≦ Lr1 ≦ Lrb, where Prb is an output ratio obtained based on a desired output. The width ratios Lra and Lrb are numerical values satisfying 0.20 <Lra <Lrb <0.71. By doing so, it is possible to reliably obtain an output of the output ratio Prb or more.

  FIG. 6 shows the results when the circumferential distance τ is τ = 9δ and the rotational speed of the rotor 12 is 1800 [rpm]. Although illustration is omitted, if the circumferential distance τ is in the range of 3δ ≦ τ ≦ 15δ and the rotational speed of the rotor 12 is below the rating, the same result as the characteristic line SC2 was obtained.

  According to the rotary electric machine 10 described above, the claw-shaped magnetic poles 12ma and 12mb of the rotor 12 are formed within a range of 3δ ≦ τ ≦ 15δ, and are formed within a range of 0.20 ≦ Lr1 ≦ 0.71 ( 1 to 6). According to this configuration, since the circumferential distance τ is ensured to be larger than that in the prior art, magnetic flux leakage can be sufficiently reduced. Moreover, the amount of generated magnetic flux can be increased by increasing the area of the end face of the radial end 12c, and the output can be improved by an additive effect.

[Embodiment 2]
The second embodiment will be described with reference to FIGS. For simplicity of illustration and description, unless otherwise specified, the same elements as those used in the first embodiment are denoted by the same reference numerals and description thereof is omitted. Therefore, differences from the first embodiment will be mainly described.

(First configuration example)
A first configuration example of the claw-shaped magnetic pole 12ma and the claw-shaped magnetic pole 12mb adjacent in the circumferential direction will be described with reference to FIGS. Hereinafter, as in the case of the first embodiment (specifically, FIG. 4), the claw-shaped magnetic pole 12ma will be described as a representative.

  The claw-shaped magnetic pole 12ma shown in FIG. 7 has a radial end 12c, a first part 12d1, a second part 12d2, a root part 12e, and the like. The difference from the claw-shaped magnetic pole 12ma shown in FIG. 4 is that it further has a second portion 12d2.

  The second portion 12d2 is a part of the air gap enlarged portion 12d and is formed on at least a part of both sides in the circumferential direction of the claw-shaped magnetic pole 12ma. The second portion 12d2 is formed to extend from the tip of the claw-shaped magnetic pole 12m to the first portion 12d1 in the axial direction.

  In FIG. 8, a center axis CL <b> 3 indicated by a one-dot chain line is a center line of the claw-shaped magnetic pole 12 m extending from the rotation center CP of the rotor 12. The first portion 12d1 described above is formed such that the angle formed with the central axis CL3 of the claw-shaped magnetic pole 12m (12ma, 12mb) is α when viewed from the axial direction. The first portion 12d1 may be formed within a range of 5 ° <α <45 ° (see FIG. 11). On the other hand, the second portion 12d2 is formed such that the angle formed with the central axis CL3 of the claw-shaped magnetic pole 12m is β when viewed from the axial direction. The relationship between the angles α and β is α <β <90 °.

  In other words, the second portion 12d2 has a shallower angle than the first portion 12d1 with respect to the tip portion 11te of the tooth 11t, and the magnetic flux easily flows. Therefore, the change of the magnetic flux accompanying rotation of the rotor 12 becomes smooth, and magnetic noise can be reduced. Further, by appropriately setting the angle α of the first part 12d1, magnetic flux leakage can be further reduced, the area of the first part 12d1 can be further increased to increase the amount of generated magnetic flux, and magnetic noise can be reduced.

(Second configuration example)
A second configuration example of the claw-shaped magnetic pole 12ma and the claw-shaped magnetic pole 12mb adjacent in the circumferential direction will be described with reference to FIGS. Hereinafter, differences from the first configuration example will be mainly described.

  The claw-shaped magnetic pole 12ma shown in FIGS. 9 and 10 includes a radial end 12c, a first part 12d1, a second part 12d2, a root part 12e, and the like, as in the first configuration example. The difference from the first configuration example is that the second portion 12d2 extends to the root portion 12e. Such a second portion 12d2 appears when the angle α is small (for example, within a range of 5 ° <α <26 °). When the second portion 12d2 extends to the root portion 12e, the second portion 12d2 is further shallower than the first portion 12d1 with respect to the tip portion 11te of the tooth 11t. Therefore, the change of the magnetic flux accompanying rotation of the rotor 12 becomes smooth, and magnetic noise can be further reduced.

  A comparison between the output of the rotating electrical machine 10 having the claw-shaped magnetic poles 12ma and 12mb of the first configuration example and the second configuration example described above and the output of the prior art will be described with reference to FIG. FIG. 11 shows the output ratio Pr1 when the output is measured by changing the angle α of the first part 12d1. The output ratio Pr3 is the output of the rotating electrical machine 10 when the output of the prior art is “1”. The “output” in the present embodiment is a power generation output (that is, a power output) as in the first embodiment.

  According to the characteristic line SC3 shown in FIG. 11, when the claw-shaped magnetic poles 12ma and 12mb are formed in the range where the angle α is 5 ° <α <45 °, the output is higher than that of the prior art. The claw-shaped magnetic poles 12ma and 12mb may be formed so as to satisfy αa ≦ α ≦ αb, where Prc is an output ratio obtained based on a desired output. The circumferential distances τa and τb are numerical values satisfying 5 ° <αa <αb <45 °. In this way, an output greater than the output ratio Prc can be reliably obtained.

  FIG. 11 shows the results when the circumferential distance τ is τ = 9δ, the rotational speed of the rotor 12 is 1800 [rpm], and the width ratio Lr is Lr1 = 0.45. Although not shown, the circumferential distance τ is in the range of 3δ ≦ τ ≦ 15δ, the rotational speed of the rotor 12 is below the rating, and the width ratio Lr is in the range of 0.20 ≦ Lr1 ≦ 0.71. Then, the same result as the characteristic line SC3 was obtained.

[Embodiment 3]
The third embodiment will be described with reference to FIGS. For simplicity of illustration and description, unless otherwise specified, the same elements as those used in the first and second embodiments are denoted by the same reference numerals and description thereof is omitted. Therefore, differences from Embodiments 1 and 2 will be mainly described.

  A configuration example of the claw-shaped magnetic pole 12ma and the claw-shaped magnetic pole 12mb adjacent in the circumferential direction will be described with reference to FIGS. A claw-shaped magnetic pole 12ma shown in FIG. 12 is a modification of the claw-shaped magnetic pole 12ma shown in FIG. A claw-shaped magnetic pole 12ma shown in FIG. 13 is a modification of the claw-shaped magnetic pole 12ma shown in FIG. Hereinafter, as in the case of the first embodiment (specifically, FIG. 4) and the second embodiment (specifically, FIG. 7), the claw-shaped magnetic pole 12ma will be described as a representative.

  The claw-shaped magnetic pole 12ma shown in FIG. 12 is different from the claw-shaped magnetic pole 12ma shown in FIG. 4 in the configuration of the first portion 12d1. The first portion 12d1 shown in FIG. 4 is formed to extend to the root portion 12e in the axial direction. On the other hand, the first portion 12d1 shown in FIG. 12 is formed extending in the axial direction to the end of the pole core 12a (the root side in the drawing).

  The claw-shaped magnetic pole 12ma shown in FIG. 13 is different from the claw-shaped magnetic pole 12ma shown in FIG. 7 in the configuration of the first portion 12d1. The first portion 12d1 shown in FIG. 7 is formed to extend to the root portion 12e in the axial direction. On the other hand, the first portion 12d1 shown in FIG. 13 is formed extending in the axial direction to the end of the pole core 12a (the root side in the drawing).

  According to the configuration of the first portion 12d1 shown in FIGS. 12 and 13, the stator winding 11a is cooled when the pole cores 12a and 12b of the rotor 12 rotate in the rotation direction R as shown in FIG. Cooling air F can be generated. Therefore, the temperature of the stator winding 11a can be reduced and heat loss can be reduced, so that the output can be improved.

[Embodiment 4]
The fourth embodiment will be described with reference to FIG. FIG. 15 is a development view in the circumferential direction seen from the XV direction shown in FIG. For simplicity of illustration and description, unless otherwise specified, the same elements as those used in the first to third embodiments are denoted by the same reference numerals and description thereof is omitted. Therefore, differences from Embodiments 1 to 3 will be mainly described.

  A stator 11 shown in FIG. 15 is a modification of the stator 11 shown in FIG. 15 differs from the stator winding 11a shown in FIG. 1 in the configuration of the coil end portion CE. In the stator winding 11a shown in FIG. 15, the coil end portion CE is formed by a segment conductor Seg. The segment conductor Seg is bent so as to exit from one slot 11s and enter another slot 11s. Ventilation paths 11c are formed between the segment conductors Seg or on the inner side close to the stator core 11b.

  As described above, the stator 11 has the ventilation path 11c formed by the segment conductor Seg. Therefore, the cooling fan 14 shown in FIG. 1 and the first portion 12d1 shown in FIG. 14 make it easier for the cooling air F to flow, and the cooling effect can be further enhanced.

[Embodiment 5]
The fifth embodiment will be described with reference to FIG. For simplicity of illustration and description, unless otherwise specified, the same elements as those used in Embodiments 1 to 4 are denoted by the same reference numerals and description thereof is omitted. Therefore, the points different from the first to fourth embodiments will be mainly described.

  A configuration example of the claw-shaped magnetic pole 12ma and the claw-shaped magnetic pole 12mb adjacent in the circumferential direction will be described with reference to FIG. Hereinafter, as in the case of the first embodiment (specifically, FIG. 4), the claw-shaped magnetic pole 12ma will be described as a representative. Note that the axial center position CL4 shown in FIG. 16 is a center line in the axial direction of the tooth 11t.

  A claw-shaped magnetic pole 12ma shown in FIG. 16 has a radial end 12c, a first portion 12d1, a root 12e, and the like. The following two points are different from the claw-shaped magnetic pole 12ma shown in FIG. First, with respect to the axial length, the radial end 12c of the claw-shaped magnetic pole 12ma and the tip 11te of the tooth 11t have the same length. Secondly, the tip end surface of the claw-shaped magnetic pole 12ma (the axial end surface shown on the leading end side in the drawing) and the axial end surface 11f of the tooth 11t are configured to coincide with each other.

  According to the configuration described above, the magnetic flux flowing between the stator 11 and the rotor 12 is concentrated at the tip 11te on the stator 11 side and the radial end 12c on the rotor 12 side. Therefore, since the magnetic flux leakage between the claw-shaped magnetic poles 12m due to the claw-shaped magnetic poles 12m being too long can be prevented, the output can be further improved.

  Although not shown, the claw-shaped magnetic poles 12m (12ma, 12mb) and the teeth 11t shown in FIGS. 7, 9, 12, and 13 are configured similarly to the claw-shaped magnetic poles 12m and the teeth 11t shown in FIG. May be. Even if comprised in this way, the magnetic flux leakage between the claw-shaped magnetic poles 12m can be prevented, and the output can be further improved.

[Embodiment 6]
The sixth embodiment will be described with reference to FIG. For simplicity of illustration and description, unless otherwise specified, the same elements as those used in Embodiments 1 to 5 are denoted by the same reference numerals and description thereof is omitted. Therefore, differences from Embodiments 1 to 5 will be mainly described.

  A configuration example of the claw-shaped magnetic pole 12ma and the claw-shaped magnetic pole 12mb adjacent in the circumferential direction will be described with reference to FIG.

  Each of the claw-shaped magnetic poles 12ma and 12mb shown in FIG. 17 has a radial end portion 12c, a first portion 12d1, a root portion 12e, and the like. Differences from the claw-shaped magnetic poles 12ma and 12mb shown in FIG. 4 are the following two points regarding the length in the axial direction. First, the axial end surface 11f (upper side in the drawing) of the tooth 11t is made longer by the axial distance D1 than the front end surface of the claw-shaped magnetic pole 12mb (the axial end surface shown on the upper side in the drawing). Secondly, the axial end surface 11f (lower side in the drawing) of the tooth 11t is made longer by the axial distance D2 than the distal end surface of the claw-shaped magnetic pole 12ma (the axial end surface shown on the lower side in the drawing). The axial distances D1 and D2 may be set arbitrarily. That is, 0 <D1 <D2, D1 = D2, or D1> D2> 0.

  According to the configuration described above, the tip of the claw-shaped magnetic pole 12m is located inside the stator core 11b including the axial end surface 11f of the tooth 11t. Since the claw-shaped magnetic pole 12m is short in the axial direction, magnetic flux leakage between the claw-shaped magnetic poles 12m can be prevented, and the output is further improved.

  Although not shown, the claw-shaped magnetic poles 12m (12ma, 12mb) and the teeth 11t shown in FIGS. 7, 9, 12, and 13 are configured similarly to the claw-shaped magnetic poles 12m and the teeth 11t shown in FIG. May be. Even if comprised in this way, the magnetic flux leakage between the claw-shaped magnetic poles 12m can be prevented, and the output can be further improved.

[Other Embodiments]
In the above, although the form for implementing this invention was demonstrated according to Embodiment 1-6, this invention is not limited to the said form at all. In other words, various forms can be implemented without departing from the scope of the present invention. For example, the following forms may be realized.

  In Embodiment 1-6 mentioned above, it was set as the structure which applies the housing 13 which has the front housing 13F, the rear housing 13R, etc. (refer FIG. 1). Instead of this form, as shown in FIG. 18, a housing 13 using an integrated housing 13FR in which a front housing 13F and a rear housing 13R are integrated may be applied. Since only the configuration of the housing 13 is different, the same effect as the first to sixth embodiments can be obtained.

  In Embodiment 1-6 mentioned above, it was set as the structure which applies the semi-closed slot type stator core 11b (refer FIG. 1). Instead of this form, an open slot type stator core 11b may be applied as shown in FIG. Since only the configuration of the slot 11s is different, the same effect as the first to sixth embodiments can be obtained.

  In Embodiment 1-6 mentioned above, it was set as the structure which applies pole core 12a, 12b provided with U-shaped groove | channel 12au, 12bu (refer FIG. 1). Instead of this form, as shown in FIG. 20, pole cores 12a and 12b that do not include the U-shaped grooves 12au and 12bu may be applied. It is effective when the pole core 12a and the claw-shaped magnetic pole 12mb, or between the pole core 12b and the claw-shaped magnetic pole 12ma are separated to such an extent that no magnetic flux leakage occurs. Since only the configuration of the pole cores 12a and 12b is different, the same effects as those of the first to sixth embodiments can be obtained.

  In the first to sixth embodiments described above, the center position CL1 between the magnetic poles, which is the center between the claw-shaped magnetic pole 12ma and the claw-shaped magnetic pole 12mb, is configured to coincide with the axial direction (FIGS. 4, 7, 9, and 12). FIG. 13, FIG. 16, FIG. 17). Instead of this form, the center position CL1 between the magnetic poles may be configured in a direction (skew direction) intersecting the axial direction. For example, the claw-shaped magnetic pole 12ma and the claw-shaped magnetic pole 12mb shown in FIGS. 21 corresponds to the modification of FIG. 3, and FIG. 22 corresponds to the modification of FIG. The tip 11te of the tooth 11t may be formed in a parallelogram shape as shown in FIG. 22, or may be formed in a rectangular shape as shown in FIG. Further, the shape of the claw-shaped magnetic pole 12m can be freely set as long as the circumferential distance τ is in the range of 3δ ≦ τ ≦ 15δ and the width ratio Lr is in the range of 0.20 ≦ L1 / L2 ≦ 0.71. May be set. For example, a sawtooth shape or a gear shape is applicable. Although not shown, pole cores 12a and 12b that do not include the U-shaped grooves 12au and 12bu may be used as shown in FIG. Since only the shape of the claw-shaped magnetic pole 12m is different, the same effect as the first to sixth embodiments can be obtained.

  In Embodiment 1-6 mentioned above, it was set as the structure which applies an inner rotor type generator to the rotary electric machine 10 (refer FIG. 1). Instead of this form, an inner rotor type electric motor or motor generator may be applied, or an outer rotor type electric generator, electric motor, or motor generator may be applied. In the outer rotor type, the stator 11 is disposed on the inner diameter side, and the rotor 12 is disposed on the outer diameter side. Since the function of the rotating electrical machine 10 is different or only the arrangement of the stator 11 and the rotor 12 is different, the same effects as those of the first to sixth embodiments can be obtained. 5, 6, and 11, the output in the case of the power generation function of the motor generator is a power generation output (that is, power output). Moreover, the output in the case of the electric function of an electric motor or a motor generator becomes torque.

  In the above-described first to sixth embodiments, the cooling air suction hole 13b and the cooling air discharge hole 13a are provided in the housing 13, and the cooling fan 14 and the first portion 12d1 cool the cooling air with the cooling air F (FIG. 1, FIG. 1). (See FIG. 14). Instead of this form, a cooling water inlet for introducing cooling water and a cooling water outlet for discharging cooling water are provided in the housing 13, and the introduced cooling water is scattered by the cooling fan 14 or the first portion 12d1. It is good also as a water-cooling structure to cool. Since there is only a difference between air cooling and water cooling, the same effect as in the first to sixth embodiments can be obtained.

  In Embodiment 1-6 mentioned above, it was set as the structure which shape | molds the claw-shaped magnetic pole 12m (12ma, 12mb) with a soft magnetic body (refer FIG. 3, FIG. 21). Instead of this form, the claw-shaped magnetic pole 12m may be formed of a magnet magnetized with an N pole or an S pole, or a combination of a soft magnetic material and a magnet. Since only the difference of the magnetomotive force source is obtained, the same effect as the first to sixth embodiments can be obtained. Since the claw-shaped magnetic pole 12m serves as a magnetomotive force source, the field coil 16 is not necessary. Since the claw-shaped magnetic pole 12m can be formed larger as much as the field coil 16 becomes unnecessary, the generated magnetic flux can be increased.

10 Rotating electric machine (Rotating electric machine for vehicles)
11 Stator
12 Rotor
12a, 12b Pole core 12d Expanded air gap 12d1 First part 12d2 Second part 12m (12ma, 12mb) Claw-shaped magnetic pole

Claims (6)

A stator core (11b) having a slot (11s) provided with a plurality of teeth (11t) extending in the radial direction at intervals in the circumferential direction, and a stator winding (11a) incorporated in the slot. A stator (11);
Tapered claw-shaped magnetic poles (12 m, 12 ma, 12 mb) are provided at a predetermined pitch in the circumferential direction, are opposed to the claw-shaped magnetic poles so as to mesh with each other, and are fixed to the shaft. (12c) and a pair of pole cores (12a, 12b) provided so as to have an air gap (G) between the tooth tips and a field provided so as to be covered by the claw-shaped magnetic poles In the rotating electrical machine for a vehicle (10) including the rotor (12) having a coil,
Each of the claw-shaped magnetic poles
An air gap enlarged portion (12d) having an air gap larger than the air gap with respect to the tip portion of the teeth is formed on at least a part of both sides in the circumferential direction,
When viewed from the radial direction, when the center position (CL1) between the magnetic poles that are the centers of the claw-shaped magnetic poles adjacent to each other in the circumferential direction coincides with the center position of the teeth (CL2) that is the center of the tip of the teeth, The tip of the claw-shaped magnetic pole does not overlap the radial end of each of the claw-shaped magnetic poles adjacent to each other, and at least a part of the air gap enlarged portion of each of the claw-shaped magnetic poles adjacent in the circumferential direction Configured to overlap
When the circumferential distance between the radial end portion and the tip end portion of the tooth is τ and the air gap is δ, it is formed within the range of 3δ ≦ τ ≦ 15δ,
A vehicular rotating electrical machine characterized by being formed within a range of 0.20 ≦ L1 / L2 ≦ 0.71, where L1 is an end surface nail tip width and L2 is an end surface nail root width. In addition to the first portion (12d1) in which the angle formed by the central axis (CL3) of the claw-shaped magnetic pole is α when the claw-shaped magnetic pole is viewed from the axial direction, the air gap enlarged portion includes the claw-shaped magnetic pole. A second portion (12d2) extending in the axial direction from the tip of the first portion and having an angle with the central axis of β,
2. The rotating electrical machine for a vehicle according to claim 1, wherein the first part and the second part are formed to satisfy α <β.   3. The rotating electrical machine for a vehicle according to claim 2, wherein the first portion is formed within a range of 5 ° <α <45 °.   The rotating electrical machine for a vehicle according to any one of claims 1 to 3, wherein the air gap enlarged portion is formed to extend to an end portion of the pole core.   The vehicular rotating electrical machine according to any one of claims 1 to 4, wherein the coil end portion (CE) of the stator winding is formed by a segment conductor (Seg).   6. The rotating electrical machine for a vehicle according to claim 1, wherein a tip end of the claw-shaped magnetic pole is positioned inside the stator core including an axial end face (11 f) of the teeth. .

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