JP6648865B1 - Rotating electric machine - Google Patents

Abstract

A rotating electric machine capable of preventing a fastener for fixing an armature core to a housing from being loosened or detached. A rotating electric machine (1) according to the present invention includes a housing (10) rotatably supporting a rotor (20) and a circle fixed to the housing (10) while being arranged around the rotor (20). An armature (30) having an annular armature core (40), wherein the armature core (40) is a connected body of a plurality of constituent units, and a plurality of protrusions are provided on an upper surface of the housing (10). A part (12) is formed, and the armature core (40) is connected to the protrusion (12) in a state where the upper surface of each protrusion (12) is in surface contact with only one of the lower surfaces of the plurality of constituent units. The fastener (46) is fixed to the housing (10) by attaching the fastener (46) to the structural unit that makes surface contact.

Description

  The present invention relates to a rotating electric machine.

  The rotating electric machine includes, for example, a rotor and an armature core disposed around the rotor. The armature core is formed by, for example, connecting a plurality of divided cores in an annular shape. Patent Literature 1 describes an example of a rotating electric machine.

Japanese Patent No. 5889157

  When the armature core is a connected body of the split cores, a slight shift may occur in the relative position of the split cores in the axial direction of the rotor. For this reason, when the armature core is fixed to the housing with a fastener such as a bolt, there may be a split core in which the fastener is attached but not in contact with the housing. The split core not in contact with the housing vibrates in a state separated from the housing due to vibration generated by the operation of the rotating electric machine. In this case, loosening or detachment of the fastener may occur.

  The present invention has been made to solve the above problems. An object of the present invention is to provide a rotating electric machine capable of preventing a fastener for fixing an armature core to a housing from becoming loose or coming off.

A rotating electric machine according to the present invention includes: a housing rotatably supporting a rotor; and an armature having an annular armature core fixed to the housing while being arranged around the rotor. The armature core is a connected body of a plurality of constituent units, and a plurality of protrusions are formed on the upper surface of the housing. In a state in which the armature core is fixed to the housing by attaching a fastener to the structural unit that comes into surface contact with the projection in a state of being in surface contact with only the armature core, the structural unit of the armature core is one divided iron core, and The upper surface is formed smaller than the lower surface of the split core, and the armature core is formed in an annular shape by connecting a plurality of split cores, and is formed on both sides of the split core in surface contact with a protrusion formed on the housing. Split iron core formed in housing It not in contact with another convex portion, is intended to be fixed to the housing by projection and the surface contact with fastener in the portion is attached in the divided core.

  According to the present invention, a plurality of protrusions are formed on the upper surface of the housing. The armature core is fixed to the housing by attaching fasteners to the structural units that are in surface contact with the protrusions, with the upper surfaces of the individual protrusions in surface contact with only one of the lower surfaces of the plurality of constituent units. You. For this reason, it is possible to prevent the fastener for fixing the armature core to the housing from becoming loose or coming off.

FIG. 3 is a perspective view of the rotating electric machine according to the first embodiment. FIG. 3 is a perspective view of a housing of the rotating electric machine according to the first embodiment. FIG. 3 is a side view of an armature core of the rotating electric machine according to the first embodiment. FIG. 15 is a perspective view of a rotating electric machine according to a second embodiment. FIG. 13 is a perspective view of a split core unit of the rotating electric machine according to the second embodiment. FIG. 13 is a perspective view of an armature core of the rotating electric machine according to the second embodiment. FIG. 13 is a perspective view of a housing of a rotating electric machine according to a second embodiment.

  Hereinafter, embodiments will be described with reference to the accompanying drawings. In the respective drawings, the same or corresponding parts are denoted by the same reference characters. Duplicate descriptions will be simplified or omitted as appropriate.

Embodiment 1 FIG.
FIG. 1 is a perspective view of the rotating electric machine according to the first embodiment.

  The rotating electric machine 1 includes a housing 10, a rotor 20, and an armature 30. The housing 10 rotatably supports the rotor 20. The armature 30 is held by the housing 10 so as to surround the rotor 20 with a certain gap between the armature 30 and the rotor 20. The armature 30 is located above the housing 10.

  The rotor 20 includes a rotating shaft 21, a rotor core 22, and a plurality of magnets 23.

  The rotating shaft 21 is inserted at the axial position of the rotor core 22. The rotor core 22 is fixed to the rotating shaft 21. The magnets 23 are arranged at equal intervals along the circumferential direction on the outer peripheral surface of the rotor core 22. The rotation shaft 21 is rotatably supported by the housing 10.

  The armature 30 includes an armature core 40 and a plurality of armature coils 50.

  The armature core 40 is formed in an annular shape. The armature core 40 is, for example, a connected body formed by connecting a plurality of constituent units in a circumferential direction.

  The constituent unit of armature core 40 in the first embodiment is split core 41. The armature core 40 is formed in an annular shape by connecting a plurality of divided cores 41. The divided core 41 is connected to another divided core 41 by, for example, welding. FIG. 1 illustrates an armature core 40 composed of 36 divided cores 41.

  Each split core 41 has, for example, one back yoke 42 and one magnetic pole tooth 43. The magnetic pole teeth 43 protrude from the back yoke 42.

  The back yoke 42 of the split core 41 is connected to the back yoke 42 of the other split core 41. In the annular armature core 40, the portion of the back yoke 42 has a cylindrical shape. The magnetic pole teeth 43 protrude radially inward from the inner peripheral wall surface of the cylindrical portion formed by the back yoke 42. The magnetic pole teeth 43 are arranged at equal intervals along the circumferential direction on the inner peripheral wall surface. For example, the armature core 40 composed of 36 divided cores 41 has 36 magnetic pole teeth 43.

  The armature coil 50 is a coil manufactured by winding a conductor wire around the magnetic pole teeth 43 via an insulator (not shown). In the armature core 40, a space called a slot 44 is formed between adjacent magnetic pole teeth 43. That is, the armature coil 50 of the armature 30 is housed in the slot 44 of the armature core 40.

  A hole 45 is formed in each divided core 41. The hole 45 is formed, for example, at the center of the back yoke 42. The hole 45 penetrates from the upper surface to the lower surface of the split core 41. The armature core 40 is fixed to the housing 10 by, for example, passing fasteners 46 through holes 45 of the plurality of split cores 41. The fastener 46 is, for example, a bolt or a pin.

  FIG. 2 is a perspective view of a housing of the rotating electric machine according to the first embodiment.

  The housing 10 has a base 11 and a plurality of protrusions 12. The base part 11 is formed in a disk shape, for example. The base portion 11 has a hole 13 through which the rotating shaft 21 passes. The plurality of protrusions 12 are formed on the upper surface of the base 11.

  The plurality of protrusions 12 are arranged, for example, in a circle at a certain interval. The upper surface of each projection 12 is smaller than the lower surface of one split core 41. The number of the protrusions 12 is smaller than the number of the split cores 41. The interval between the protrusions 12 is, for example, larger than the width of one split core 41.

  A bolt hole 14 is formed in at least a part of the plurality of protrusions 12. FIG. 2 illustrates a case where one bolt hole 14 is provided in each of nine protrusions 12 of the eighteen protrusions 12. FIG. 2 illustrates a case where a plurality of convex portions 12 arranged in a circle are provided with alternate bolt holes 14. In addition, the bolt holes 14 may be provided in all the protrusions 12.

  FIG. 3 is a side view of the armature core of the rotating electric machine according to the first embodiment.

  The armature core 40 has a cylindrical lower surface 47. The cylindrical lower surface 47 is formed by connecting lower surfaces of adjacent components. The cylindrical lower surface 47 is a lower surface of a cylindrical portion formed by the back yoke 42 of the divided cores 41 connected in an annular shape. In the assembled rotary electric machine 1, the cylindrical lower surface 47 of the armature core 40 contacts or faces the housing 10.

  FIG. 3 shows a shift between the split cores 41 in a direction corresponding to the axial direction of the rotor 20 of the rotary electric machine 1. In FIG. 3, some divided cores 41 are distinguished by adding alphabets to the reference numerals. For example, the split core 41c is not shifted with respect to the split core 41a. For example, the split iron core 41b is shifted so as to protrude toward the cylindrical lower surface 47 as compared with the split iron core 41a and the split iron core 41c. For example, the split core 41d is shifted so as to protrude to the side opposite to the cylindrical lower surface 47 as compared to the split core 41a and the split core 41c.

  In FIG. 3, the shift amount between the split cores 41 is emphasized. Actually, it is possible to connect the divided iron cores 41 with a smaller deviation amount. However, it is difficult to make the shift amount zero. In addition, the displacement between the split cores 41 is caused by variation in the assembly operation of the armature cores 40. Therefore, it is also difficult to predict in which axial direction the individual split cores 41 shift.

  The armature 30 is provided with a fastener 46 through the hole 45 of the split core 41 and the bolt hole 14 of the projection 12 in a state where the cylindrical lower surface 47 of the armature core 40 and the upper surfaces of the plurality of projections 12 are in surface contact. To the housing 10.

  Only one split core 41 is in contact with one protrusion 12. Each of the protrusions 12 comes into contact with a different one of the divided cores 41. A plurality of protrusions 12 are arranged on the upper surface of the housing 10 such that the protrusions 12 do not contact other divided cores 41 adjacent to the divided core 41 contacted by the protrusions 12. FIG. 1 illustrates a case where every other one of the divided cores 41 that are connected in an annular shape contacts the protrusion 12.

  The fastener 46 is not attached to the split core 41 that does not contact the protrusion 12. The fastener 46 is attached to, for example, at least a part of the plurality of split cores 41 that come into contact with the protrusion 12. FIG. 1 illustrates a case where the fastener 46 is attached only to the split core 41 that is in contact with the protrusion 12 provided with the bolt hole 14 illustrated in FIG. 2. When the bolt holes 14 are provided in all the protrusions 12, the fasteners 46 may be attached to all the split cores 41 that come into contact with the protrusions 12.

  For example, when the split core 41a and the split core 41c shown in FIG. 3 are in contact with different projections 12, the split core 41b and the split core 41d do not contact the housing 10. In this case, the assembled rotary electric machine 1 is not affected by the fact that the split cores 41b and 41d are displaced from the split cores 41a and 41c.

  According to the first embodiment described above, the annular armature core 40 is fixed to the housing 10 while being arranged around the rotor 20. The armature core 40 is a connected body formed by connecting a plurality of constituent units in a circumferential direction. A plurality of protrusions 12 are formed on the upper surface of the housing 10. The armature core 40 has at least a part of a plurality of constituent units that are in surface contact with the protrusion 12 in a state where the upper surface of each protrusion 12 is in surface contact with only one of the lower surfaces of the plurality of constituent units. The fixture 46 is fixed to the housing 10 by being attached to the unit. That is, even if the cylindrical lower surface 47 of the armature iron core 40 is not a uniform flat surface, the component to which the fastener 46 is attached can surely come into contact with the projection 12. For this reason, the component to which the fastener 46 is attached does not vibrate in a state separated from the housing 10 even when receiving the operation vibration or the like of the rotary electric machine 1. As a result, the fastener 46 for fixing the armature core 40 to the housing 10 can be prevented from loosening or coming off.

  The constituent unit of the armature core 40 is, for example, one split core 41 having one back yoke 42 and one magnetic pole tooth 43 protruding from the back yoke 42. The upper surface of the convex portion 12 is formed smaller than the lower surface of the split core 41, for example. The armature core 40 is, for example, formed in an annular shape by connecting the back yokes 42 of the plurality of divided cores 41 to each other, and at least a part of the plurality of divided cores 41 that are in surface contact with the protrusion 12. The fastener 46 is fixed to the housing 10 by being attached to 41. For this reason, even if the lower surfaces of the connected split cores 41 are shifted from each other, the split core 41 to which the fastener 46 is attached can surely come into contact with the projection 12. As a result, it is possible to prevent the fastener 46 for fixing the armature core 40 to the housing 10 from being loosened or coming off.

Embodiment 2 FIG.
Hereinafter, Embodiment 2 will be described. Description overlapping with the first embodiment will be omitted as appropriate.

  FIG. 4 is a perspective view of the rotating electric machine according to the second embodiment. FIG. 5 is a perspective view of a split core unit of the rotating electric machine according to the second embodiment. FIG. 6 is a perspective view of an armature core of the rotating electric machine according to the second embodiment.

  The rotating electric machine 1 according to the second embodiment is the same as the rotating electric machine 1 according to the first embodiment, except that the structure of the armature core 40 and the protrusion 12 of the housing 10 are different.

  In the second embodiment, a constituent unit of armature core 40 is split core unit 60. The armature core 40 is formed in an annular shape by connecting a plurality of split core units 60. The divided core unit 60 is connected to another divided core unit 60 by, for example, welding. FIGS. 4 and 6 illustrate the armature core 40 including the six split core units 60.

  The split core unit 60 is an arc-shaped member to which a plurality of smaller split cores 61 are connected. The shape and size of the split core 61 are the same as, for example, the split core 41. FIG. 5 illustrates a split core unit 60 including six split cores 61.

  Each split core 61 is, for example, a laminate formed by stacking plate-shaped core pieces. The core piece is produced, for example, from a thin plate by press working or the like. The laminated core pieces are fixed, for example, by caulking 62. The adjacent split cores 61 are connected by, for example, a caulking 63.

  In FIG. 5, six divided cores 61 are distinguished by adding alphabets to the reference numerals. All the core pieces forming the divided cores 61f from the divided cores 61a are punched simultaneously from the same thin plate by press working. The divided cores 61a to 61f are a laminate of the same number of core pieces obtained from the same thin plate. For this reason, in the direction corresponding to the axial direction of the rotor 20 of the rotary electric machine 1, there is no displacement between the lower surfaces of the divided cores 61a to 61f. That is, the arc-shaped lower surface 64 of each divided core unit 60 becomes a uniform plane.

  The split core 61a forming one end of the split core unit 60 is connected to the split core 61f forming the other end of the other split core unit 60. For this reason, in cylindrical lower surface 47 of armature core 40 in the second embodiment, a step may occur only at the boundary between adjacent split core units 60.

  FIG. 7 is a perspective view of a housing of the rotating electric machine according to the second embodiment.

  In the second embodiment, the upper surface of the projection 12 is smaller than the arc-shaped lower surface 64 of one split core unit 60. The upper surface of the projection 12 may be larger than the lower surface of one split core 61, for example. FIG. 7 illustrates a case where one bolt hole 14 is provided in each of the nine protrusions 12.

  In the second embodiment, one protrusion 12 may be in contact with a plurality of split cores 61 included in the same split core unit 60. However, only one split core unit 60 contacts one protrusion 12. A plurality of protrusions 12 are arranged on the upper surface of the housing 10 so as not to overlap the boundary between the adjacent split core units 60. That is, the plurality of protrusions 12 are provided on the upper surface of the housing 10 so that there is no protrusion 12 that is simultaneously in contact with both the split core 61a included in one of the adjacent split core units 60 and the split core 61f included in the other. Is arranged. Note that a plurality of protrusions 12 may contact one split core unit 60 at the same time.

  The fastener 46 is attached to, for example, one split core 61 included in the split core unit 60 that comes into contact with the protrusion 12. When a plurality of bolt holes 14 are provided in one protrusion 12, even if the fastener 46 is attached to a plurality of divided cores 61 included in the divided core unit 60 that comes into contact with the protrusion 12. Good.

  According to the second embodiment described above, the armature core 40 comes into surface contact with the protrusions 12 in a state where the upper surface of each protrusion 12 is in surface contact with only one of the lower surfaces of the plurality of constituent units. The fastener 46 is attached to at least a part of the plurality of constituent units to be fixed to the housing 10. Therefore, similarly to the first embodiment, the effect of preventing the fastener 46 for fixing the armature core 40 to the housing 10 from being loosened or coming off can be obtained.

  The constituent unit of the armature core 40 is, for example, an arc-shaped divided core unit 60 in which a plurality of divided cores 61 are connected. The upper surface of the protrusion 12 is formed smaller than the lower surface 64 of the split core unit 60, for example. The armature core 40 is formed in an annular shape by connecting the back yokes 42 at the ends of the plurality of split core units 60, for example, and the boundary between the two adjacent split core units 60 and the protrusion 12 are formed. In a non-overlapping state, the fastener 46 is attached to at least one split core 61 included in the split core unit 60 that is in surface contact with the protrusion 12, and is fixed to the housing 10. Therefore, even if the lower surfaces 64 of the connected split core units 60 are displaced from each other, the split iron core 61 to which the fastener 46 is attached can surely come into contact with the projection 12. As a result, the fastener 46 for fixing the armature core 40 to the housing 10 can be prevented from loosening or coming off. In addition, since the constituent unit of the armature core 40 is the split core unit 60, the efficiency of the assembling work of the rotating electric machine 1 can be improved.

  Further, all the divided cores 41 included in one divided core unit 60 are, for example, a laminate of core pieces obtained from the same thin plate. Therefore, the lower surface 64 of the split core unit 60 can be made a uniform plane.

  INDUSTRIAL APPLICABILITY As described above, the present invention can be used for a rotating electric machine that can prevent a fastener for fixing an armature core to a housing from becoming loose or coming off.

REFERENCE SIGNS LIST 1 rotating electric machine 10 housing 11 base portion 12 convex portion 13 hole 14 bolt hole 20 rotor 21 rotating shaft 22 rotor core 23 magnet 30 armature 40 armature core 41 split core 41a split core 41b split core 41c split core 41d split core 42 Back yoke 43 Magnetic pole teeth 44 Slot 45 Hole 46 Fastener 47 Cylindrical lower surface 50 Armature coil 60 Split core unit 61 Split core 61a Split iron core 61b Split iron core 61c Split iron core 61d Split iron core 61e Split iron core 61f Split iron core 62 Crimp 63 64 bottom

Claims (1)

A housing for rotatably supporting the rotor,
An armature having an annular armature core fixed to the housing while being arranged around the rotor;
With
The armature core is a connected body of a plurality of constituent units,
A plurality of protrusions are formed on the upper surface of the housing,
The armature iron core is configured such that a fastener is attached to a structural unit that makes surface contact with the protrusion while the upper surface of each of the protrusions is in surface contact with only one of the lower surfaces of the plurality of constituent units. In a rotating electric machine fixed to a housing,
The constituent unit of the armature core is one split core,
The upper surface of the projection is formed smaller than the lower surface of the split core,
The armature core is formed in an annular shape by connecting a plurality of the split cores, and the split cores on both sides of the split core that are in surface contact with the projections formed on the housing are separated from each other on the housing. A rotating electric machine fixed to the housing by attaching a fastener to a portion of the split core that does not contact the convex portion but makes surface contact with the convex portion.

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