JP2013081288A - Electric motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric motor which reduces the assembly man hours.SOLUTION: An electric motor includes a rotor and a stator. The stator has a stator core having multiple split cores 31; multiple insulators 60; and multiple coil parts 70. Each split core 31 has a yoke piece 41 and a tooth 50. The tooth 50 has a circular arc part 51 and a connection part 52. A conduction wire 71 and a heat absorption wire 72 absorbing heat generated by the conduction wire 71 are wound around the connection part 52. The heat absorption wire 72 is formed by insulative coating an aluminum wire with a resin of polyamide or polyamide imide. Winding the conduction wire 71 and the heat absorption wire 72 simultaneously allows the heat absorption wire 72 to be disposed around the conduction wire 71.

Description

  The present invention relates to an electric motor including a winding portion around which a conducting wire is wound.

  The rotating electrical machine of Patent Document 1 includes a coil around which a wire is wound and a rotating electrical machine core on which the coil is disposed. Between the coil and the core of the rotating electrical machine and between the windings of the coil, a heat conductive insulating resin that absorbs and dissipates heat generated by the coil is filled.

JP 2009-022088 A

  In the manufacturing process of the rotating electrical machine, in order to fill the heat conductive insulating resin, the work of setting the stator wound with the coil in the mold, the work of filling the resin injection cylinder with the heat conductive insulating resin, the mold Many work processes such as a work of filling the inside of the stator with a heat conductive insulating resin are required. Moreover, since the heat conductive insulating resin in a liquid state generally has a high viscosity, the filling operation of the heat conductive insulating resin is not easy. From the above, it takes much time to assemble the rotating electrical machine.

  The present invention has been made to solve the above problems, and an object of the present invention is to provide an electric motor capable of reducing the number of assembly steps.

  (1) The first means is the invention according to claim 1, that is, an electric motor having a winding portion around which a conducting wire is wound, wherein the winding portion has a heat absorbing wire that absorbs heat generated by the conducting wire. The gist is that is wrapped.

  According to the said invention, the heat | fever emitted from an energization line is absorbed by the endothermic line, and is thermally radiated. For this reason, the temperature rise of the electric motor during drive can be controlled. Therefore, in the present invention, it is not necessary to fill the winding portion around which the conductive wire is wound with the heat conductive resin, so that it is possible to reduce the number of assembling steps of the electric motor.

(2) The second means is the invention according to claim 2, that is, the electric motor according to claim 1, wherein the endothermic wires are arranged between the adjacent conducting wires. .
According to the above invention, the contact area of the endothermic wire with respect to the energizing wire is increased. Thereby, the quantity which heat_absorbs the heat_generation | fever of an energization line with an endothermic line increases. For this reason, the heat dissipation efficiency of the heat absorption line with respect to the heat generation of the energization line is increased.

(3) The third means is the invention according to claim 3, that is, the electric motor according to claim 1 or 2, wherein both ends of the endothermic wire are electrically opened.
According to the said invention, compared with the time when electrically connected, the amount of electric current which flows into a heat sink can be decreased. Thereby, heat_generation | fever of an endothermic line is suppressed. For this reason, the heat generated by the conducting wire can be absorbed efficiently by the heat absorbing wire.

  According to the present invention, an electric motor capable of reducing the number of assembly steps can be provided.

BRIEF DESCRIPTION OF THE DRAWINGS Sectional drawing which shows the whole structure about the electric motor of one Embodiment of this invention. The principal part sectional drawing which shows the structure of a stator about the electric motor of the embodiment. The perspective view which shows the structure of a split core about the electric motor of the embodiment.

The configuration of the electric motor 1 will be described with reference to FIG.
The electric motor 1 includes a rotor 10 and a stator 20. The rotor 10 and the stator 20 are accommodated in the housing 80. The housing 80 includes a cylindrical housing body 81, a lid member 82, and a bottom member 83.

  A through hole is formed in the center of the lid member 82. A bearing 91 is provided at the periphery of the through hole. A recess is formed at the center of the bottom member 83. A bearing 92 is provided at the periphery of the recess. The recess of the bottom member 83 faces the inside of the housing 80.

  A lower end portion 93 </ b> D of the output shaft 93 is accommodated in the recess of the bottom member 83. The upper end portion 93U of the output shaft 93 is exposed to the outside from the through hole of the lid member 82. The output shaft 93 is rotatably supported by a bearing 91 and a bearing 92.

  The housing body 81 and the lid member 82, and the housing body 81 and the bottom member 83 are fixed to each other by bolts (not shown). A control board 94 is accommodated in the housing 80. The control board 94 controls the operation of the electric motor 1. The control board 94 is fixed to the bottom member 83.

Here, the following terms are defined for the electric motor 1.
(A) The axial direction of the output shaft 93 is “axial direction S”, the circumferential direction of the output shaft 93 is “circumferential direction T”, and the radial direction of the output shaft 93 is “radial direction R”.
(B) In the radial direction R, the direction approaching the output shaft 93 is “inward”, and the direction away from the output shaft 93 is “outward”.
(C) In the directions of the housing 80, the rotor 10, and the stator 20, the definitions of (A) and (B) are used for the directions that coincide with the directions of the output shaft 93.

The rotor 10 rotates integrally with the output shaft 93. The rotor 10 includes a rotor body 11, a rotor magnet 12, a spacer 13, and a protection member 14.
The rotor body 11 is a cylindrical sintered body containing a ferromagnetic material such as iron. The rotor body 11 holds a rotor magnet 12. The rotor magnet 12 is a cylindrical permanent magnet. On the outer peripheral surface of the rotor magnet 12, N-pole and S-pole magnetic poles are alternately arranged in the circumferential direction T. In the rotor 10, the rotor main body 11, the rotor magnet 12, the spacer 13, and the protection member 14 rotate around the axis of the output shaft 93 as one rotating body. The stator 20 is fixed inside the housing body 81. The rotor 10 and the stator 20 are opposed to each other with a predetermined interval in the radial direction R.

The configuration of the stator 20 will be described with reference to FIG.
The stator 20 includes a stator core 30, a plurality of insulators 60, and a plurality of winding portions 70. The stator core 30 is a cylindrical member that is configured integrally by arranging a plurality of split cores 31 in the circumferential direction T. The split core 31 is a metal member integrally formed by laminating a plurality of electromagnetic steel plates. The split core 31 includes a yoke piece 41 and a tooth 50.

  The yoke piece 41 is configured as an annular yoke 40 by arranging the divided cores 31 in the circumferential direction to form the stator core 30. The teeth 50 are columnar members having a substantially T-shaped cross section in the radial direction R. The teeth 50 are integrally provided on the inner peripheral surface 41Q of the yoke piece 41. The teeth 50 protrude inward in the radial direction R from the inner peripheral surface 41Q.

  When the stator core 30 is accommodated in the housing 80, the plurality of divided cores 31 are arranged in the circumferential direction T and combined in a cylindrical shape. The stator core 30 combined in a cylindrical shape is accommodated along the inner peripheral surface of the housing body 81. The stator core 30 accommodated in the housing 80 is fixed to the inner peripheral surface with an adhesive. Thereby, the plurality of divided cores 31 are connected to each other.

The configuration of the split core 31 will be described with reference to FIG.
As shown in FIG. 3A, in the split core 31, the tooth 50 includes an arc portion 51 and a connecting portion 52. The connecting portion 52 has a pair of side surfaces 52S. The split core 31 has two groove portions 32A with the connecting portion 52 interposed therebetween.

  The groove portion 32 </ b> A has an inner peripheral surface 41 </ b> Q of the yoke piece 41, a side surface 52 </ b> S of the connecting portion 52, and an outer peripheral surface 51 </ b> P of the arc portion 51. An insulator 60 is provided in the groove 32A. The insulator 60 is an insulating member for ensuring insulation between the tooth 50 and the winding part 70.

  As shown in FIG. 3B, the connecting portion 52 is provided with a winding portion 70 via an insulator 60. The winding portion 70 extending in the axial direction S is accommodated in the groove portion 32A. Winding portion 70 has energization wire 71 and heat absorption wire 72. The conducting wire 71 is an insulating coating of a copper wire with a resin such as polyester. Both ends of the conducting wire 71 are connected to the control board 94 of FIG.

  The endothermic wire 72 is obtained by insulatingly coating an aluminum wire with a resin such as polyamideimide. The endothermic wire 72 is a thinner wire than the conducting wire 71. Both end portions of the endothermic wire 72 are electrically open. Both ends of the endothermic wire 72 are fixed to the insulator 60 in the split core 31 around which the endothermic wire 72 is wound, with one end and the other end separated.

  When the conducting wire 71 and the endothermic wire 72 are wound around the connecting portion 52, the one conducting wire 71 and the two endothermic wires 72 are bundled. The bundled energization wire 71 and the heat absorption wire 72 are wound around the connection portion 52 about one turn. The split core 31 is fixed to a winding machine (not shown) and rotates. In the process where the conducting wire 71 and the endothermic wire 72 having different thicknesses are wound around the connecting portion 52 at the same time, the endothermic wire 72 is arranged around the conducting wire 71.

(Effect of this embodiment)
According to the electric motor 1 of the present embodiment, the following effects can be obtained.
(1) The electric motor 1 includes a rotor 10 and a stator 20. The stator 20 is wound with a conductive wire 71 and a heat absorption wire 72 that absorbs heat generated by the conductive wire 71.

  According to this configuration, the heat generated from the energized wire 71 during energization is absorbed by the heat absorbing wire 72 and is radiated to the outside of the electric motor 1 via the connecting portion 52 and the yoke piece 41 (yoke 40). For this reason, even when the heat conductive insulating resin is not filled in the portion of the stator 20 around which the conductive wire 71 is wound, the temperature increase of the electric motor 1 being driven can be suppressed. Therefore, in the present invention, since the filling work of the heat conductive resin is not required, the number of assembling steps of the electric motor 1 can be reduced.

(2) In the electric motor 1, the endothermic wires 72 are arranged between the adjacent energizing wires 71.
According to this structure, the contact area of the heat absorption line 72 with respect to the conducting wire 71 increases. As a result, the amount of heat absorbed by the heat absorption line 72 from the heat conduction line 71 increases. For this reason, the heat dissipation efficiency of the heat absorption line 72 with respect to the heat generation of the conduction line 71 is increased. Therefore, in this invention, the temperature rise of the electric motor 1 during drive can be suppressed more.

(3) In the electric motor 1, the endothermic wire 72 is obtained by insulatingly coating an aluminum wire with a polyamide or polyamideimide resin. Both end portions of the endothermic wire 72 are fixed to the insulator 60 in the split core 31 around which the endothermic wire 72 is wound, with one end portion and the other end portion being separated from each other.
According to this configuration, since both end portions of the heat absorption line 72 are electrically opened, the heat absorption line 72 is not energized regardless of whether the energization line 71 is energized. Therefore, in this invention, it can suppress that a magnetic field arises in the endothermic line 72 and malfunction occurs in the electric motor 1.

  Further, by using an aluminum wire having a higher thermal conductivity than that of the heat conductive resin, the amount of heat absorbed by the heat absorption wire 72 is increased. For this reason, the heat dissipation efficiency of the heat absorption line 72 with respect to the heat generation of the conduction line 71 is further increased. Therefore, in this invention, the temperature rise of the electric motor 1 during drive can be suppressed more effectively.

  Here, in an electric motor having a large calorific value, a decrease in the magnetic characteristics of the magnet is suppressed by increasing the temperature characteristics of the magnet in the electric motor. For example, dysprosium is added to a neodymium magnet that tends to cause thermal demagnetization when heated but has a high magnetic flux density and a very strong magnetic force, thereby improving the coercive force. However, since rare earth metals such as dysprosium are expensive, the use of magnets containing rare earth metals increases the manufacturing cost of the motor.

  In the electric motor 1, since the temperature rise during driving can be suppressed, it is possible to suppress a decrease in the magnetic characteristics of the rotor magnet 12. Thereby, since the magnet which reduced content of rare earth metals, such as dysprosium, and the magnet which does not contain rare earth metals can be used as the rotor magnet 12, the manufacturing cost of the electric motor 1 can be held down.

(Other embodiments)
The embodiment of the present invention is not limited to the contents of the above embodiment, and can be modified as follows, for example. Further, the following modified examples are not applied only to the above embodiment, and different modified examples can be implemented in combination with each other.

  In the above embodiment (FIG. 3), the present invention is applied to the electric motor 1 having the stator 20 around which the conducting wire 71 and the heat absorbing wire 72 are wound. However, the present invention can also be applied to the following electric motor. For example, the present invention can be applied to a three-phase claw pole type electric motor having a stator composed of three stator cores and a rotor. That is, the present invention can also be applied to an electric motor that requires a heat conductive resin filling operation for a winding portion around which a conducting wire is wound.

  -In the said embodiment (FIG. 3), although the heat absorption wire 72 was distribute | arranged to the circumference | surroundings of the electric wire 71, it can also be changed as follows. For example, after energizing only the endothermic wire 72 with respect to the connecting portion 52, the energizing wire 71 can be wound from above. As a result, the winding portion 70 has a two-layer structure of a layer around which the heat absorption wire 72 is wound and a layer around which the energization wire 71 is wound, as viewed from the connecting portion 52 side.

  Moreover, after winding only the energization wire 71 previously with respect to the connection part 52, the heat absorption wire 72 can also be wound from it. Thereby, the winding part 70 has a two-layer structure of a layer around which the conducting wire 71 is wound and a layer around which the endothermic wire 72 is wound, as viewed from the connecting part 52 side.

  Further, a winding method in which a layer in which only the endothermic wire 72 is wound and a layer in which only the conductive wire 71 is wound is sandwiched is also possible. Thereby, the winding part 70 has a three-layer structure of the layer around which the endothermic wire 72 is wound, the layer around which the conducting wire 71 is wound, and the layer around which the endothermic wire 72 is wound, as viewed from the connecting part 52 side. .

  In the above embodiment, the endothermic wire 72 is formed by insulatingly coating an aluminum wire with a polyamide or polyamideimide resin, but a metal other than aluminum, for example, a copper wire can also be used.

  In the above embodiment, both end portions of the endothermic wire 72 are fixed to the insulator 60 in the split core 31 around which the endothermic wire 72 is wound, with one end portion and the other end portion separated from each other. Each end of the endothermic wire 72 can be fixed to an insulator 60 provided in the adjacent split core 31.

  In the above embodiment, the stator core 30 is a cylindrical member that is configured integrally by arranging the plurality of divided cores 31 in the circumferential direction T. Further, the split core 31 is a metal member integrally formed by laminating a plurality of electromagnetic steel plates. However, the stator core 30 and the split core 31 are not limited to the above configuration. For example, the split core 31 can be a sintered body containing a ferromagnetic material such as iron. The stator core 30 may be a cylindrical member integrally formed by arranging the split cores 31 that are sintered bodies in the circumferential direction T.

  In the above embodiment, the rotor magnet 12 is a cylindrical permanent magnet, but the material of the permanent magnet is not particularly limited. For example, the presence or absence of the rare earth metal contained in the permanent magnet is not limited.

(Additional notes based on the description of the embodiment)
Items obtained by superposing the items described in the above embodiment will be described below.
(Additional remark 1) The electric motor according to any one of claims 1 to 3, wherein the heat absorption line is a string-like thermally conductive insulating resin.

  According to this electric motor, the work of winding the solid heat conductive insulating resin in the solid state is more than the work of filling the winding portion around which the conductive wire is wound with the liquid heat conductive insulating resin. It becomes easy. For this reason, the working efficiency concerning the assembly of the electric motor is increased. Therefore, it is possible to reduce the number of assembly steps of the electric motor.

(Additional remark 2) The electric motor according to Additional remark 1, wherein the number of heat absorption wires wound around the winding portion is larger than the number of energization wires wound around the winding portion.
According to this electric motor, since the number of turns of the heat absorption wire is larger than the number of turns of the conduction wire, the amount of heat absorbed by the heat absorption wire increases.

(Additional remark 3) The electric motor according to Additional remark 1 or 2, wherein the heat absorption line is thinner than the energization line.
According to this electric motor, the space factor of the heat absorption line increases. Thereby, the quantity which heat_absorbs the heat_generation | fever of an energization line with an endothermic line increases. Moreover, the fall of the space factor of the conducting wire wound by the coil | winding part can be suppressed. Thereby, the performance of the electric motor can be maintained.

(Additional remark 4) The electric motor according to any one of Additional remarks 1 to 3, wherein the energized wire and the endothermic wire are wound around the winding portion in a state of being bound to each other.
According to this electric motor, it becomes easy to arrange an endothermic wire around the energizing wire. Thereby, the contact area of the endothermic line with respect to the conducting wire increases. For this reason, the quantity which absorbs heat_generation | fever of an energization line with an endothermic line increases.

  (Appendix 5) In the electric motor according to any one of claims 1 to 3, the endothermic wire is a metal wire, and the thermal conductivity of the metal wire is higher than the thermal conductivity of the conductive wire. Features an electric motor.

  According to this electric motor, the heat generated by the energized wire is easily transmitted to the metal wire. Thereby, the quantity which heat_absorbs the heat_generation | fever of an energization line with an endothermic line increases. For this reason, it becomes possible to improve the thermal radiation efficiency by a metal wire.

(Additional Item 6) The electric motor according to Additional Item 5, wherein the metal wire is an aluminum wire.
According to this electric motor, since the light metal wire is wound around the winding portion, the work of winding the energization wire and the heat absorption wire is facilitated. As a result, the working efficiency related to the assembly of the electric motor is increased. Therefore, it is possible to reduce the number of assembly steps of the electric motor. Further, an increase in the weight of the electric motor can be suppressed.

  DESCRIPTION OF SYMBOLS 1 ... Electric motor, 10 ... Rotor, 20 ... Stator, 30 ... Stator core, 31 ... Divided core, 41 ... Yoke piece, 50 ... Teeth, 60 ... Insulator, 70 ... Winding part, 71 ... Conducting wire, 72 ... Endothermic wire.

Claims (3)

In an electric motor having a winding portion around which a conducting wire is wound,
An endothermic wire that absorbs heat generated by the energization wire is wound around the winding portion. The electric motor according to claim 1,
An electric motor characterized in that the heat absorption line is arranged between the adjacent energization lines. The electric motor according to claim 1 or 2,
Both ends of the endothermic wire are electrically opened.

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