JP4244325B2 - Rotating electrical machine rotor - Google Patents

Description

  According to the present invention, permanent magnets are inserted into and fixed to a plurality of permanent magnet support holes provided at predetermined intervals along the outer peripheral surface of a rotor core that is press-fitted and fixed to a rotor shaft. It is related with the rotor of the rotary electric machine which provided the auxiliary pole part extended in radial direction between adjacent through-holes by forming a through-hole.

Such a rotor of a rotating electrical machine is known, for example, as described in FIG. 6, FIG. 8, and FIG.
JP 2002-305859 A

  By the way, in this type of rotating electrical machine rotor, when the rotor core is press-fitted into the rotor shaft and the permanent magnet is press-fitted into the permanent magnet support hole formed in the rotor core, the outer peripheral portion of the rotor core is stretched in the circumferential direction by the press-fitting load. If a strong tensile stress is concentrated in the vicinity of the through hole and the auxiliary pole portion formed between adjacent permanent magnet support holes, and centrifugal force is applied to the permanent magnet as the rotor rotates, the centrifugal force is Since the outer peripheral portion of the rotor core acts to stretch in the circumferential direction, the tensile stress may be further increased, which may adversely affect the durability of the rotor core.

  The present invention has been made in view of the above-described circumstances, and improves the durability of the rotor core by relaxing the stress concentration in the region sandwiched between the permanent magnet support holes formed at predetermined intervals along the outer peripheral surface of the rotor core. With the goal.

In order to achieve the above object, according to the first aspect of the present invention, permanent magnets are respectively provided in a plurality of permanent magnet support holes provided at predetermined intervals along the outer peripheral surface of a rotor core press-fitted and fixed to a rotor shaft. In a rotor of a rotating electrical machine in which an auxiliary pole portion extending in the radial direction is provided between adjacent through holes by forming through holes on both sides in the circumferential direction of the permanent magnet support holes, The cross-sectional shape of the permanent magnet orthogonal to the axis is as follows: an outer surface and an inner surface extending generally in the circumferential direction, a pair of side surfaces extending generally in the radial direction, and a pair of inclined surfaces that connect the circumferential ends of the outer surface to the pair of side surfaces, respectively. includes bets, cross-sectional shape of the permanent magnet support hole perpendicular to the axis of the rotor shaft is generally coincident to the cross-sectional shape of the permanent magnet, dense permanent magnet support hole in the permanent magnet at least an outer surface and an inner surface It is inserted so that a pair of inclined surfaces in that state has between gap between the permanent magnet support hole, and the rotor core, and having an outer bridge portion between the outer circumferential surface thereof and the through hole The inner bridge portion is provided between the inclined surface of the permanent magnet and the through-hole, and the pair of outer bridge portions adjacent to each other is connected to the radially outer end of the auxiliary pole portion and adjacent to each other. A rotor of a rotating electrical machine is proposed in which the pair of inner bridge portions are connected to the radially inner ends of the auxiliary pole portions.

  According to the configuration of claim 1, when the rotor core is press-fitted into the rotor shaft, the outer peripheral portion of the rotor core is stretched in the circumferential direction, and the pair of outer bridge portions adjacent to each other is connected to the radially outer end of the auxiliary pole portion. Tensile stress is concentrated on the part where the rotor is rotated, and when the rotor rotates, the tensile stress is strengthened by the centrifugal force acting on the outer periphery of the rotor core. When the rotor rotates and centrifugal force acts on the permanent magnet, the centrifugal load of the permanent magnet is transmitted from the outer surface to the inclined surface side inclined toward the inner diameter side, and a pair of inner bridge portions adjacent to each other compensate. Tensile stress concentrates on the portion connected to the inner end in the radial direction of the pole portion. In this way, the stress due to the press-fit load and the centrifugal force is distributed to the part where the outer bridge part is connected to the auxiliary pole part and the part where the inner bridge part is connected to the auxiliary pole part, so that only the former is stressed. It is possible to increase the durability of the rotor core by preventing the concentration of the rotor core.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below based on examples of the present invention shown in the accompanying drawings.

  1 to 3 show an embodiment of the present invention, FIG. 1 is a perspective view of a rotor, FIG. 2 is an enlarged sectional view taken along line 2-2 of FIG. 1, and FIG. FIG.

  As shown in FIGS. 1 and 2, a rotor 11 that is rotatably arranged around an axis L within a stator of a motor includes a rotor shaft 12, a rotor core 13, and a plurality (16 in the embodiment) of permanent magnets. 14, a first end plate 16, and a second end plate 17.

  The rotor shaft 12 is an annular rotor core that integrally connects the shaft body 12a, a plurality of (eight in the embodiment) spoke parts 12b extending radially from the shaft body 12a, and the tips of the spoke parts 12b. The flange 12d protrudes radially outward from one end surface in the axis L direction of the rotor core support 12c. The annular rotor core 13 in which the inner peripheral surface 13b is fixed to the outer peripheral surface of the rotor core support portion 12c of the rotor shaft 12 by press-fitting is formed by laminating a plurality of steel plates, and 16 pieces are equally spaced along the outer peripheral surface 13a. Permanent magnet support holes 13c are formed. Each permanent magnet support hole 13c is opened at both end faces in the axis L direction of the rotor core 13, and the permanent magnet 14 is inserted into the permanent magnet 14 with its position regulated in the circumferential direction.

  As is apparent from FIG. 3 as well, the cross-sectional shape of the permanent magnet 14 in the direction orthogonal to the axis L is a linear outer surface 14a along the outer peripheral surface 13a of the rotor core 13 and the radially inner side of the outer surface 14a. A linear inner surface 14b extending in parallel, a pair of linear side surfaces 14c, 14c rising radially outward from both circumferential ends of the inner surface 14b, and both circumferential ends of the outer surface 14a are connected to the pair of side surfaces 14c, 14c. And a hexagon having a pair of linear inclined surfaces 14d and 14d.

  On the other hand, the cross-sectional shape of the permanent magnet support hole 13c substantially matches the cross-sectional shape of the permanent magnet 14, and when the permanent magnet 14 inserted therein rotates, only the outer surface 14a closely adheres to the permanent magnet support hole 13c. The inclined surfaces 14d and 14d are opposed to each other with a minute gap between them and the permanent magnet support hole 13c. The engagement relationship between the side surfaces 14c, 14c of the permanent magnet 14 and the permanent magnet support hole 13c may be any as long as it can prevent the permanent magnet 14 from moving in the circumferential direction. By forming the notches 18 and 18 in the radially outer portion of the facing portion between the side surfaces 14c and 14c and the permanent magnet support hole 13c, an auxiliary pole portion 13e extending in the radial direction is formed between both the notches 18 and 18. Yes.

  Triangular through-holes 19 and 19 are formed in a triangular region sandwiched between the inclined surfaces 14d and 14d of the permanent magnet 14 and the outer peripheral surface 13a of the rotor core 13, and a space between a pair of adjacent through-holes 19 and 19 is formed. An auxiliary pole portion 13d extending in the radial direction is formed in the first and second electrodes. The complementary pole portion 13d and the complementary pole portion 13e formed between the pair of notches 18 and 18 are arranged in the same phase. In order to generate a rotating field in the stator, it is necessary to detect the rotational position of the rotor 11, and the auxiliary pole portions 13d and 13e are provided for that purpose.

  By forming the through hole 19 in the rotor core 13, a narrow outer bridge portion 13 f is formed between the through hole 19 and the outer peripheral surface 13 a of the rotor core 13, and the inclined surface of the through hole 19 and the permanent magnet 14. A narrow inner bridge portion 13g is formed between 14d and 14d.

  Next, the operation of the embodiment of the present invention having the above configuration will be described.

  When the inner peripheral surface 13b of the rotor core 13 is press-fitted into the outer peripheral surface of the rotor core support portion 12c of the rotor shaft 12, the annular rotor core 13 is stretched in the circumferential direction to generate tensile stress. In particular, in the portion a surrounded by an ellipse in FIG. 3, that is, in the portion where the adjacent outer bridge portions 13f and 13f are connected to the complementary pole portion 13d, the outer bridge portions 13f and 13f are narrow, so that the stress concentration occurs. Occurs and the tensile stress increases.

  Further, when the rotor 11 rotates, the rotor core 13 itself is also urged radially outward by centrifugal force, so that the outer peripheral portion of the rotor core 13 is stretched in the circumferential direction, and the tensile stress of the portion a is further increased.

  When the rotor 11 rotates, the permanent magnet 14 is urged radially outward by centrifugal force, so that the centrifugal force extends from the end of the outer surface 14 a of the permanent magnet 14 toward the inner diameter side of the rotor 11. 13g and 13g. At this time, if the centrifugal force acting on the permanent magnet 14 is transmitted only to the outer bridge portions 13f and 13f, a strong tensile stress is concentrated on the portion a and cracks are generated at the corners of the through holes 19 and 19. In addition, the durability of the rotor core 13 may be reduced.

  However, in this embodiment, the centrifugal force acting on the permanent magnet 14 is transmitted to the inner bridge portions 13g and 13g, so that the portion b surrounded by an ellipse in FIG. 3, that is, the adjacent inner bridge portions 13g and 13g Tensile stress is applied to the portion connected to the complementary electrode portions 13d and 13e. In this way, by dispersing the stress due to the press-fitting load and the centrifugal force to the part a and the part b, the stress is prevented from concentrating only on the part a, and the rotor core 13 is prevented from being cracked and thus has durability. Can be increased.

  As mentioned above, although the Example of this invention was explained in full detail, this invention can perform a various design change in the range which does not deviate from the summary.

  For example, in the embodiment, the rotor 11 of the motor is illustrated, but the present invention can also be applied to the rotor of the generator.

  In addition, the embodiment includes the notches 18 and 18 and the complementary pole portions 13e and 13e at positions facing the side surfaces 14c and 14c of the permanent magnet 14, but the notches 18 and 18 and the complementary pole portions 13e and 13e are necessarily required. is not.

Perspective view of rotor 2-2 line enlarged sectional view of FIG. 3-3 arrow view of FIG.

Explanation of symbols

12 Rotor shaft 13 Rotor core 13a Outer peripheral surface 13c Permanent magnet support hole 13d Supplementary pole portion 13f Outer bridge portion 13g Inner bridge portion 14 Permanent magnet 14a Outer surface 14b Inner surface 14c Side surface 14d Inclined surface L Axis line

Claims (1)

The permanent magnets (14) are respectively inserted and fixed into a plurality of permanent magnet support holes (13c) provided at predetermined intervals along the outer peripheral surface (13a) of the rotor core (13) press-fitted into the rotor shaft (12). In addition, the rotating electrical machine provided with the auxiliary pole portion (13d) extending in the radial direction between the adjacent through holes (19) by forming the through holes (19) on both sides in the circumferential direction of the permanent magnet support hole (13c). In the rotor of
The cross-sectional shape of the permanent magnet (14) perpendicular to the axis (L) of the rotor shaft (12) has an outer surface (14a) and an inner surface (14b) extending in a generally circumferential direction, and a pair of side surfaces (14c) extending in a generally radial direction. ) And a pair of inclined surfaces (14d) that connect both ends of the outer surface (14a) in the circumferential direction to the pair of side surfaces (14c), respectively, and are permanent perpendicular to the axis (L) of the rotor shaft (12). The cross-sectional shape of the magnet support hole (13c) substantially matches the cross-sectional shape of the permanent magnet (14) , and the permanent magnet (14) is in close contact with the permanent magnet support hole (13c) at least on the outer surface (14a) and the inner surface (14b). It is inserted so that a pair of inclined surfaces in this state (14d) is a permanent magnet support hole has between gap between (13c), and a rotor core (13), and the outer peripheral surface (13a) Through hole (1 ) Between the inclined surface (14d) of the permanent magnet (14) and the through hole (19), and the inner bridge portion (13g) A pair of adjacent outer bridge portions (13f) is connected to the radially outer end of the complementary pole portion (13d), and a pair of inner bridge portions (13g) adjacent to each other is radial to the complementary pole portion (13d). A rotor of a rotating electrical machine connected to an inner end.

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