JP2010158099A - Molded motor and electric vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a molded motor in which heat generated in a coil can be efficiently released, and to provide an electric vehicle. <P>SOLUTION: In the molded motor 5, an insulator 70 is exposed from a molded part 90 in a projection part 70B. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a molded motor including a stator including a plurality of teeth molded by resin, and an electric vehicle including the molded motor.

  Conventionally, a mold motor has been widely used as a drive source for electric vehicles and washing machines.

  The molded motor includes an annular stator and a rotor disposed inside the stator. The stator includes a plurality of teeth molded with resin. The outer periphery of each tooth is surrounded by an insulator, and a coil is wound around the outer periphery of the insulator.

  Here, various efforts have been made to improve the rated output by efficiently radiating heat from the coil heated by energization (see, for example, Patent Document 1). Japanese Patent Application Laid-Open No. H10-228561 discloses a technique for transmitting the heat of a coil to a housing via a heat radiating plate.

On the other hand, there has been proposed a technique for transmitting the heat of a coil to a tooth having high thermal conductivity through an insulator around which the coil is wound (see Patent Document 2). According to this method, since it is not necessary to provide a heat sink, it is possible to reduce the size and cost of the motor.
JP 2008-178190 A JP 2001-128402 A

  However, in the molded motor, since the teeth, the insulator, and the coil are molded with resin, the technique described in Patent Document 2 has a limit in improving heat dissipation. That is, there is room for more efficient heat dissipation by increasing the heat conduction path for heat dissipation from the coil.

  The present invention has been made to solve the above-described problems, and an object thereof is to provide a molded motor and an electric vehicle that can efficiently dissipate heat from a coil.

  A molded motor according to a feature of the present invention is a molded motor including an annular stator and a rotor disposed inside the stator, and the stator is provided on the outer periphery of the insulator, the insulator surrounding the outer periphery of the tooth, and the insulator. The coil includes a coil to be wound, a tooth, an insulator, and a mold part for molding the coil, and a part of the insulator is exposed from the mold part.

  According to the molded motor according to the feature of the present invention, the heat radiation path of the heat generated in the coil 80 can be enhanced. As a result, the heat generated in the coil 80 can be efficiently radiated.

  In the characteristics of the present invention, the insulator may be made of a material having a higher thermal conductivity than the resin constituting the mold part.

  In the characteristics of the present invention, the insulator may have a protruding portion that protrudes outward in the radial direction of the stator.

  In the feature of the present invention, the protrusion may extend along the circumferential direction of the stator.

  An electric vehicle according to a feature of the present invention is an electric vehicle including a rotatable wheel and a molded motor that drives the wheel, and the molded motor includes an annular stator and a rotor disposed inside the stator. The stator includes a tooth, an insulator that surrounds the outer periphery of the tooth, a coil that is wound around the outer periphery of the insulator, and a mold portion that molds the tooth, the insulator, and the coil. The electric vehicle exposed toward the outside of the section is exposed.

  ADVANTAGE OF THE INVENTION According to this invention, the mold motor and electric vehicle which can improve heat dissipation, maintaining dustproofness and waterproofness can be provided.

  Next, embodiments of the present invention will be described with reference to the drawings. In the following description of the drawings, the same or similar parts are denoted by the same or similar reference numerals. However, it should be noted that the drawings are schematic and ratios of dimensions and the like are different from actual ones. Accordingly, specific dimensions and the like should be determined in consideration of the following description. Moreover, it is a matter of course that portions having different dimensional relationships and ratios are included between the drawings.

[First Embodiment]
(Schematic configuration of electric vehicle)
Hereinafter, an electric motorcycle 1 that is an electric vehicle to which a molded motor according to a first embodiment of the present invention is applied will be described with reference to the drawings. FIG. 1 is a right side view of the electric motorcycle 1.

  As shown in FIG. 1, the electric motorcycle 1 is a so-called underbone type electric motorcycle in which a body frame is disposed below. The electric motorcycle 1 includes a front wheel 2, a rear wheel 3, a swing arm 4, and a molded motor 5.

  The front wheel 2 is rotatably supported by a front fork. The rear wheel 3 is rotatably supported by the swing arm 4. The swing arm 4 is swingably attached to the vehicle body frame.

  The mold motor 5 is fixed to the swing arm 4. The driving force generated by the mold motor 5 is transmitted to the rear wheel 3 via a motor shaft 50 (see FIG. 2) provided at the approximate center of the mold motor 5. The mold motor 5 may be a geared motor with a built-in speed reducer. The configuration of the mold motor 5 will be described later.

(Mold motor configuration)
Hereinafter, the configuration of the molded motor according to the first embodiment will be described with reference to the drawings. In the following, the “output side” is the side of the molded motor 5 where the motor shaft 50 is connected to the rear wheel 3, and the “non-output side” is the opposite side of the molded motor 5 to the output side. It is.

  FIG. 2 is a plan view of the molded motor 5 as viewed from the output side. As shown in FIG. 2, the molded motor 5 includes a motor shaft 50, a stator 51, a motor case 52, and a terminal box 53.

  The motor shaft 50 is provided substantially at the center of the molded motor 5 in plan view. The motor shaft 50 is inserted through the motor case 52. As the motor shaft 50 rotates about the axis S, the rear wheel 3 is driven.

  The stator 51 is formed in an annular shape around the motor shaft 50. A rotor (not shown) is disposed in an inner space SP (see FIG. 5) formed inside the stator 51. The motor shaft 50 is rotated as the rotor rotates. The configuration of the stator 51 will be described later.

  The motor case 52 is provided on the output side of the stator 51. The motor case 52 covers the output side of the inner space SP, and the inner space SP is sealed by the motor case 52. A motor shaft 50 is inserted into the motor case 52. The motor case 52 is screwed to the swing arm 4.

  The terminal box 53 stores the end of the cable P connected to the battery.

(Structure of stator)
Hereinafter, the configuration of the stator 51 will be described with reference to the drawings.

  FIG. 3 is a perspective view of the stator 51 according to the first embodiment as viewed from the output side. FIG. 4 is a plan view of the stator 51 according to the first embodiment viewed from the output side. FIG. 5 is a cross-sectional view taken along the line AA in FIG.

  As shown in FIGS. 3 to 5, the stator 51 includes a plurality of teeth 60, a plurality of insulators 70, a coil 80, and a mold portion 90.

  The plurality of teeth 60 are arranged at predetermined intervals along the circumferential direction of the annular stator 51 (see FIG. 4). Each tooth 60 is formed of a magnetic material (for example, an electromagnetic steel plate or powder metal). Each tooth 60 extends along a radial direction (see FIG. 5) substantially orthogonal to the axis S. One end of each tooth 60 is exposed to the inner space SP and faces a rotor (not shown).

  Each of the plurality of insulators 70 surrounds the outer periphery of the plurality of teeth 60. For example, when the tooth 60 is formed in a columnar shape, the insulator 70 surrounds the column surface of the tooth 60 so as to cover it.

  Each of the plurality of coils 80 is wound around the plurality of teeth 60 a plurality of times. By energizing each coil 80, a rotational force is generated in the rotor facing each tooth 60. At this time, each coil 80 generates heat.

  The mold part 90 is formed in an annular shape centered on the axis S and forms the outer shape of the stator 51. The molding unit 90 molds each tooth 60, each insulator 70, and each coil 80. The mold part 90 is comprised with the resin material which has insulation, such as a thermosetting resin.

  Here, as shown in FIG. 5, each insulator 70 includes a wound portion 70 </ b> A around which the coil 80 is wound and a plurality of protruding portions 70 </ b> B.

  Heat generated in the coil 80 by energization is transmitted to the wound portion 70A.

  The plurality of projecting portions 70 </ b> B project from the wound portion 70 </ b> A toward the radially outer side of the stator 51. Therefore, the insulator 70 is exposed from the mold part 90 in the plurality of protrusions 70B. Moreover, each protrusion part 70B is extended along the circumferential direction of the stator 51, as shown in FIG. That is, each protrusion 70B has a fin shape. In the first embodiment, the plurality of protruding portions 70B protrude from the output side of the wound portion 70A.

(Heat dissipation path)
Next, a heat dissipation path for heat generated in the coil 80 will be described with reference to the drawings. FIG. 6 is a schematic diagram showing main heat dissipation paths.

  As shown in FIG. 6, there are mainly three heat dissipation paths.

  The heat dissipation path X is a path that travels from the coil 80 to the outside through the mold portion 90.

  The heat dissipation path Y is a path that is transmitted from the coil 80 to the outside through the insulator 70, the teeth 60, and the mold portion 90 in order.

  The heat dissipation path Z is a path that travels from the coil 80 to the outside through the insulator 70. Specifically, the heat dissipation path Z is configured by the wound portion 70A and the protruding portion 70B. Thus, in the heat dissipation path Z, the heat of the coil 80 is directly released to the outside through the insulator 70. Therefore, the insulator 70 is preferably made of a material having a higher thermal conductivity than the resin constituting the mold part 90.

(Function and effect)
In the molded motor 5 according to the first embodiment, the insulator 70 is exposed from the molded portion 90 at the protruding portion 70B. Therefore, the heat generated in the coil 80 is transmitted to the outside of the stator 51 through the insulator 70. Thereby, the heat radiation path of the heat generated in the coil 80 can be increased. As a result, the heat generated in the coil 80 can be efficiently radiated.

  Moreover, in 1st Embodiment, the insulator 70 is comprised with the material which has higher heat conductivity than resin which comprises the mold part 90. FIG. Therefore, the heat dissipation efficiency in the heat dissipation path Z described above can be made higher than the heat dissipation efficiency in the heat dissipation path X. As a result, the heat dissipation efficiency can be further improved.

  In the first embodiment, the insulator 70 includes a plurality of projecting portions 70 </ b> B that project toward the radially outer side of the stator 51. Therefore, the area where the insulator 70 is in contact with the outside air can be increased. As a result, the heat dissipation efficiency can be further improved.

  In the first embodiment, each of the plurality of projecting portions 70 </ b> B extends along the circumferential direction of the stator 51. That is, each protrusion 70B has a fin shape. Therefore, as shown in FIG. 1, it is possible to make it easier to enter the traveling wind between each of the plurality of protrusions 70 </ b> B when the mold motor 5 is attached. As a result, the heat dissipation efficiency can be further improved.

[Second Embodiment]
Next, a stator 51 according to a second embodiment of the present invention will be described with reference to the drawings. In the following, differences from the first embodiment will be mainly described.

  FIG. 7 is a cross-sectional view showing the configuration of the stator 51 according to the second embodiment. As shown in FIG. 7, the plurality of projecting portions 70B project from the wound portion 70A toward the outside in the axis S direction. Specifically, each of the plurality of protruding portions 70B protrudes from the wound portion 70A toward the output side of the stator 51. Therefore, the insulator 70 is exposed from the mold part 90 at the plurality of protrusions 70B.

(Function and effect)
In the molded motor 5 according to the second embodiment, the insulator 70 is exposed from the molded portion 90 at the protruding portion 70B. Therefore, the heat generated in the coil 80 is transmitted to the outside of the stator 51 through the insulator 70. Thereby, the heat radiation path of the heat generated in the coil 80 can be increased. As a result, the heat generated in the coil 80 can be efficiently radiated.

(Other embodiments)
Although the present invention has been described by using the above-described embodiments, it should not be understood that the description and drawings constituting a part of this disclosure limit the present invention. From this disclosure, various alternative embodiments, examples and operational techniques will be apparent to those skilled in the art.

  For example, in the first embodiment, the plurality of protruding portions 70B protrude from the output side of the wound portion 70A, but the plurality of protruding portions 70B protrude from the opposite output side of the wound portion 70A. It may be. Specifically, as shown in FIG. 8, the insulator 70 has a vertically contrasting configuration, and heat from the coil can be released also from the opposite output side of the wound portion 70 </ b> A. Can be improved.

  In the second embodiment, the plurality of protrusions 70B protrude from the wound portion 70A toward the output side of the stator 51. However, the plurality of protrusions 70B extend from the wound portion 70A. You may protrude toward the non-output side of the stator 51. Specifically, as shown in FIG. 9, the insulator 70 has a vertically-contrast configuration and can release the heat of the coil from the wound portion 70 </ b> A toward the non-output side. Can be improved.

  Moreover, although the insulator 70 demonstrated the structure which has the protrusion part 70B in the said embodiment, the insulator 70 does not need to have the protrusion part 70B. Specifically, as shown in FIG. 10, a part of the insulator 70 only needs to be exposed from the mold part 90. As a result, the heat dissipation path can be enhanced.

  Moreover, although not touched in particular in the said embodiment, the insulator 70 may be provided with each protrusion part 70B which concerns on the said 1st and 2nd embodiment. Specifically, as shown in FIGS. 11 and 12, a protruding portion 70B protruding from the wound portion 70A along the radial direction, and a protruding portion 70B protruding from the wound portion 70A along the axial direction. You may have both.

 Thus, it should be understood that the present invention includes various embodiments and the like not described herein. Therefore, the present invention is limited only by the invention specifying matters in the scope of claims reasonable from this disclosure.

1 is a right side view of an electric motorcycle 1 according to a first embodiment of the present invention. It is the top view which looked at the mold motor 5 which concerns on 1st Embodiment of this invention from the output side. It is the perspective view which looked at the stator 51 which concerns on 1st Embodiment which concerns on 1st Embodiment of this invention from the output side. It is the top view which looked at the stator 51 which concerns on 1st Embodiment of this invention from the output side. It is sectional drawing in the AA of FIG. It is a schematic diagram which shows the thermal radiation path | route in the molded motor 5 which concerns on 1st Embodiment of this invention. It is sectional drawing which shows the structure of the stator 51 which concerns on 2nd Embodiment of this invention. It is a figure which shows the structure of the mold motor 5 which concerns on embodiment of this invention. It is a figure which shows the structure of the mold motor 5 which concerns on embodiment of this invention. It is a figure which shows the structure of the mold motor 5 which concerns on embodiment of this invention. It is a figure which shows the structure of the mold motor 5 which concerns on embodiment of this invention. It is a figure which shows the structure of the mold motor 5 which concerns on embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Electric motorcycle 2 ... Front wheel 3 ... Rear wheel 4 ... Swing arm 5 ... Molded motor 50 ... Motor shaft 51 ... Stator 52 ... Motor case 53 ... Terminal box 60 ... Teeth 70 ... Insulator 70A ... Winding part 70B ... Projection part 80 ... Coil 90 ... Mold part SP ... Inside space

Claims (5)

An annular stator;
A molded motor comprising a rotor disposed inside the stator,
The stator is
Teeth,
An insulator surrounding the outer periphery of the teeth;
A coil wound around an outer periphery of the insulator;
The teeth, the insulator, and a mold part for molding the coil;
A part of the insulator is exposed from the mold part. The molded motor according to claim 1, wherein the insulator is made of a material having a higher thermal conductivity than a resin constituting the mold part. The molded motor according to claim 1, wherein the insulator has a protruding portion that protrudes toward a radially outer side of the stator. The molded motor according to claim 3, wherein the protrusion extends along a circumferential direction of the stator. Wheels that can be driven to rotate,
An electric vehicle comprising a molded motor for driving the wheels,
The mold motor is
An annular stator;
A rotor disposed inside the stator,
The stator is
Teeth,
An insulator surrounding the outer periphery of the teeth;
A coil wound around an outer periphery of the insulator;
The teeth, the insulator, and a mold part for molding the coil;
A part of the insulator is exposed toward the outside of the mold part.

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