WO2023119801A1 - Moteur électrique et borne - Google Patents

Moteur électrique et borne Download PDF

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Publication number
WO2023119801A1
WO2023119801A1 PCT/JP2022/037990 JP2022037990W WO2023119801A1 WO 2023119801 A1 WO2023119801 A1 WO 2023119801A1 JP 2022037990 W JP2022037990 W JP 2022037990W WO 2023119801 A1 WO2023119801 A1 WO 2023119801A1
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WO
WIPO (PCT)
Prior art keywords
capacitor
terminal
plate portion
electric motor
brush
Prior art date
Application number
PCT/JP2022/037990
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English (en)
Japanese (ja)
Inventor
元 溝江
拓也 小島
貴洋 浅野
宏和 木倉
Original Assignee
パナソニックＩｐマネジメント株式会社
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Application filed by パナソニックＩｐマネジメント株式会社 filed Critical パナソニックＩｐマネジメント株式会社
Publication of WO2023119801A1 publication Critical patent/WO2023119801A1/fr

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K13/00—Structural associations of current collectors with motors or generators, e.g. brush mounting plates or connections to windings; Disposition of current collectors in motors or generators; Arrangements for improving commutation
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K13/00—Structural associations of current collectors with motors or generators, e.g. brush mounting plates or connections to windings; Disposition of current collectors in motors or generators; Arrangements for improving commutation
    • H02K13/14—Circuit arrangements for improvement of commutation, e.g. by use of unidirectionally conductive elements
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/14—Means for supporting or protecting brushes or brush holders

Definitions

  • the present disclosure relates to terminals used in electric motors and electrical equipment such as electric motors.
  • Electric motors are widely used not only in the field of household electric appliances such as vacuum cleaners, but also in the field of electrical components such as automobiles.
  • an electric blower mounted on a vacuum cleaner uses an electric motor to rotate a rotary fan.
  • Electric motors are used in two-wheeled or four-wheeled vehicles to drive cooling fans such as radiators.
  • the brushed electric motor includes a stator, a rotor rotated by the magnetic force of the stator, a commutator attached to a rotating shaft of the rotor, and brushes in sliding contact with the commutator. Electric power is supplied to the brush from an external power source through a pair of power supply terminals (for example, a positive terminal and a negative terminal connected to a DC power supply) attached to a brush holder or the like.
  • a pair of power supply terminals for example, a positive terminal and a negative terminal connected to a DC power supply
  • an electric motor used for a cooling fan for a radiator in a vehicle is required to reduce noise of a predetermined frequency.
  • electric motors for vehicles are required to reduce electromagnetic noise in the 30 to 200 MHz band (CISPR25 ALSE (absorber-lined shielded enclosure) noise band).
  • noise can be suppressed by reducing the spark between the brush and commutator, which is the source of noise, or by shielding the noise with a metal bracket or the like. ing.
  • Patent Document 1 A technique for suppressing noise by connecting a capacitor in parallel between a pair of power supply terminals has also been proposed (see Patent Document 1, for example).
  • the capacitor is housed inside the electric motor, for example, by being mounted on a circuit board arranged inside the housing of the electric motor.
  • An object of the present disclosure is to provide an electric motor and a terminal that can be made thinner even if an electronic component with leads such as a capacitor is housed inside.
  • one aspect of the electric motor according to the present disclosure includes a commutator, a brush in contact with the commutator, a brush holder that holds the brush and has a capacitor storage portion, and an electric motor for the brush.
  • a capacitor having terminals connected to each other, a main body portion housed in the capacitor housing portion, and leads drawn out from the main body portion, wherein the terminals include a top plate portion and the top plate. and an upright plate portion erected with respect to the portion, and an insertion hole through which the lead is inserted is formed in the upright plate portion.
  • one aspect of the terminal according to the present disclosure includes a top plate portion and a standing plate portion erected with respect to the top plate portion, and the leads of an electronic component with leads are attached to the standing plate portion.
  • An insertion hole is formed for insertion.
  • FIG. 1 is an external perspective view of the electric motor according to the embodiment when viewed obliquely from above.
  • FIG. 2 is an external perspective view of the electric motor according to the embodiment when viewed obliquely from below.
  • FIG. 3 is a cross-sectional view of the electric motor according to the embodiment, taken along one plane.
  • FIG. 4 is a cross-sectional view when the electric motor according to the embodiment is cut along another plane.
  • FIG. 5 is a perspective view showing the configuration of a brush holder to which various parts are attached in the electric motor according to the embodiment. 6 is an exploded perspective view of the various components and brush holder shown in FIG. 5;
  • FIG. 7 is a cross-sectional perspective view showing a configuration of part of the electric motor according to the embodiment.
  • FIG. 8 is a perspective view of a terminal used in the electric motor according to the embodiment, viewed obliquely from above.
  • FIG. 9 is a perspective view of a terminal used in the electric motor according to the embodiment, viewed obliquely from below.
  • 10A is a top view showing a configuration of a terminal according to the embodiment;
  • FIG. 10B is a front view showing the configuration of the terminal according to the embodiment;
  • FIG. 10C is a left side view showing the configuration of the terminal according to the embodiment;
  • FIG. 10D is a right side view showing the configuration of the terminal according to the embodiment;
  • FIG. FIG. 11 is a cross-sectional view of a connection structure between terminals and capacitors in the electric motor according to the embodiment.
  • FIG. 12 is a side cross-sectional view of a connection structure between terminals and capacitors in the electric motor according to the embodiment.
  • FIG. 13A is a diagram showing how the terminals are attached to the brush holder.
  • FIG. 13B is a diagram showing a state after the terminals are attached to the brush holder.
  • FIG. 13C is a diagram showing how the first capacitor is arranged in the brush holder.
  • FIG. 13D is a diagram showing how the main body of the first capacitor is housed in the capacitor housing portion of the brush holder.
  • FIG. 13E is a diagram showing a state after the body portion of the first capacitor is housed in the capacitor housing portion of the brush holder.
  • FIG. 13F shows the state after connecting the second capacitor to the terminals.
  • FIG. 14 is a perspective view showing a configuration of a brush holder to which various parts are attached in the electric motor according to Modification 1.
  • FIG. FIG. 15 is a perspective view showing a configuration of a brush holder to which various parts are attached in an electric motor according to Modification 2.
  • FIG. 16 is a cross-sectional view of an electric motor according to Modification 2.
  • FIG. 17 is an enlarged cross-sectional view of an electric motor according to Modification 3.
  • FIG. FIG. 18 is an enlarged cross-sectional view of an electric motor according to Modification 4.
  • each figure is a schematic diagram and is not necessarily strictly illustrated. Also, in each figure, the same reference numerals are assigned to substantially the same components as those in other figures, and duplicate descriptions will be omitted or simplified. Also, in this specification, the terms “upper” and “lower” do not necessarily indicate upward (vertically upward) and downward (vertically downward) directions in absolute spatial recognition.
  • FIG. 1 is an external perspective view of an electric motor 1 according to an embodiment when viewed obliquely from above.
  • FIG. 2 is an external perspective view when the electric motor 1 according to the embodiment is viewed obliquely from below.
  • 3 and 4 are cross-sectional views of the electric motor 1 according to the embodiment.
  • FIG. 3 is a cross-sectional view taken along a plane passing through the axis C of the rotating shaft 21 and passing through the brush 40. As shown in FIG. FIG.
  • FIG. 4 is a cross-sectional view taken along a plane passing through the axis C of the rotating shaft 21 and passing through the capacitor housing portion 62 of the brush holder 60.
  • FIG. 5 is a perspective view showing the configuration of a brush holder 60 to which various parts are attached in the electric motor 1 according to the embodiment.
  • FIG. 6 is an exploded perspective view of the various components and brush holder 60 shown in FIG.
  • the electric motor 1 includes a stator 10 (stator) and a rotor 20 (rotor) rotated by the magnetic force of the stator 10 .
  • the electric motor 1 is a brushed electric motor.
  • the electric motor 1 further includes a commutator 30 attached to a rotating shaft 21 of the rotor 20, at least one brush 40 in contact with the commutator 30, a brush spring 50 for pressing the brush 40 against the commutator 30, A brush holder 60 holding the brush 40 and a cover plate 70 covering the brush 40 are provided.
  • the electric motor 1 further includes terminals 80 electrically connected to the brushes 40 and a capacitor 90 connected to the terminals 80. As shown in FIGS. Electric motor 1 also includes bearing 100 , first bracket 111 , and second bracket 112 . As shown in FIGS. 1 and 2, electric wires 120 are connected to the electric motor 1 .
  • the electric motor 1 is a type of direct current motor (DC motor) driven by direct current.
  • a magnet is used as the stator 10 in the electric motor 1 .
  • An armature having a coil 22 is used as the rotor 20 in the electric motor 1 .
  • the electric motor 1 is a flat-type brushed coreless motor (flat motor) mounted on a two-wheeled or four-wheeled vehicle. Therefore, the stator 10 and rotor 20 do not have a core (iron core).
  • the electric motor 1 has a thin and light configuration as a whole. Specifically, the electric motor 1 is a small motor used for a radiator cooling fan in a vehicle.
  • the outer diameter (diameter) ⁇ of the electric motor 1 is 120 mm or less. As an example, the outer diameter ⁇ of the electric motor 1 is ⁇ 60 mm, ⁇ 70 mm, ⁇ 90 mm, or the like.
  • the electric motor 1 is driven by an input voltage of DC 12V.
  • the stator 10 is arranged with a minute air gap between it and the rotor 20 .
  • the stator 10 generates magnetic force acting on the rotor 20 .
  • the stator 10 is configured to generate magnetic flux on the air gap surface with the rotor 20 .
  • the rotor 20 forms a magnetic circuit together with the stator 10, which is an armature.
  • the stator 10 as a whole is substantially doughnut-shaped.
  • the stator 10 is configured such that N poles and S poles alternately and evenly exist on the air gap surface with the rotor 20 along the circumferential direction of the rotating shaft 21 .
  • the stator 10 is a magnetic field that creates magnetic flux for generating torque.
  • the stator 10 is composed of a plurality of magnets (magnets).
  • the magnets forming the stator 10 are, for example, permanent magnets.
  • the direction of the main magnetic flux generated by the stator 10 (magnet) is along the direction in which the rotating shaft 21 extends.
  • Stator 10
  • the rotor 20 has a rotating shaft 21 and coils 22 . Also, the rotor 20 is a coreless rotor that does not have a core.
  • the rotor 20 rotates around the direction of the axis C along which the rotating shaft 21 extends (also referred to simply as the "axis direction"). Rotor 20 generates a magnetic force acting on stator 10 .
  • the direction of the main magnetic flux generated by the rotor 20 is along the axial center C direction along which the rotating shaft 21 extends.
  • the rotor 20 is arranged facing the stator 10 .
  • the rotor 20 faces the stator 10 in the axial center C direction along which the rotating shaft 21 extends.
  • the coil 22 of the rotor 20 and the stator 10 face each other in the direction of the axis C along which the rotating shaft 21 extends. That is, the coil 22 and the stator 10 are arranged in the direction of the axis C of the rotating shaft 21 .
  • the rotating shaft 21 is a shaft having an axis C.
  • the rotating shaft 21 is an elongated rod-shaped member.
  • the rotating shaft 21 is a metal rod made of a metal material such as SUS (Stainless Used Steel).
  • An axis C included in the rotating shaft 21 is the center of rotation when the rotor 20 rotates.
  • the longitudinal direction of the rotating shaft 21, that is, the direction in which the rotating shaft 21 extends (stretching direction) is the axial center C direction.
  • the rotating shaft 21 is supported by bearings 100 .
  • the bearing 100 rotatably supports the rotating shaft 21 .
  • the rotating shaft 21 is press-fitted into the bearing 100 .
  • Bearing 100 is held by first bracket 111 . Specifically, the bearing 100 is press-fitted into a recess provided in the first bracket 111 and fixed.
  • bearing 100 is a ball bearing.
  • bearing 100 is a deep groove ball bearing.
  • the first end 21a of the rotating shaft 21 is the output-side end (output shaft).
  • a first end 21 a of the rotary shaft 21 protrudes from the first bracket 111 and the bearing 100 .
  • a first end portion 21 a of the rotating shaft 21 is an end portion of the bearing 100 and the commutator 30 of the rotating shaft 21 on the side of the bearing 100 .
  • a load such as a rotating fan is attached to the first end portion 21a.
  • the electric motor 1 in which a rotating fan is attached to the rotating shaft 21 can be used as, for example, a cooling fan and an electric blower.
  • the second end 21 b of the rotary shaft 21 is the end (counter-output shaft) on the non-output side and does not protrude from the second bracket 112 .
  • the first bracket 111 and the second bracket 112 are made of metal material, for example.
  • the first bracket 111 and the second bracket 112 are made of a ferrous material such as a cold-rolled steel plate (SPC) material or a metal such as aluminum.
  • SPC cold-rolled steel plate
  • the first bracket 111 and the second bracket 112 constitute a housing.
  • a stator 10 and a rotor 20 are arranged in this housing.
  • the first bracket 111 is an outer shell member of the electric motor 1. As shown in FIGS. The first bracket 111 is formed in a bottomed tubular shape having a bottom portion and a cylindrical side wall portion. Magnets forming the stator 10 are fixed to the bottom of the first bracket 111 . The coils 22 of the rotor 20 are surrounded by side walls of the first bracket 111 .
  • the material of the first bracket 111 and the second bracket 112 is not limited to the metal material, and may be a resin material. However, from the viewpoint of suppressing noise generated from the electric motor 1, the first bracket 111 and the second bracket 112 are preferably made of a metal material.
  • the coils 22 of the rotor 20 are wound coils.
  • the rotor 20 has multiple coils 22 .
  • the multiple coils 22 are armature windings configured by electric wires.
  • the plurality of coils 22 are wound so as to generate magnetic force acting on the stator 10 when current flows.
  • the direction of the main magnetic flux generated by each coil 22 is the axial center C direction along which the rotating shaft 21 extends.
  • the plurality of coils 22 are wound in a flat shape, and the coil surfaces are arranged in a posture facing the axial center C direction along which the rotating shaft 21 extends.
  • Each coil 22 is composed of an insulating covered wire having a core wire made of metal such as copper or aluminum and an insulating film covering the core wire.
  • Each of the plurality of coils 22 is a thin wound coil having a coil layer in which the insulated wire is wound in a plane.
  • each of the plurality of coils 22 is configured by, for example, one or a plurality of coil layers in which an insulated wire is wound in a substantially fan shape in a plan view.
  • the plurality of coils 22 configured in this way are arranged so as to surround the rotating shaft 21 when viewed from the axial center C direction along which the rotating shaft 21 extends.
  • Each of the multiple coils 22 is electrically connected to the commutator 30 . Specifically, each of the multiple coils 22 is electrically connected to one of the multiple commutator segments 31 forming the commutator 30 . Therefore, current flows through each of the plurality of coils 22 via the commutator segments 31 with which the brushes 40 are in contact.
  • a plurality of coils 22 are covered with molding resin 23 . That is, the plurality of coils 22 are resin molded. Therefore, the plurality of coils 22 are integrally molded together with the molding resin 23 by being covered with the molding resin 23 . After the plurality of coils 22 are molded, the outer shape of the mold resin 23 is circular in plan view.
  • the mold resin 23 is made of an insulating resin material such as phenol resin or unsaturated polyester (Bulk Molding Compound (BMC)).
  • the mold resin 23 may be either thermosetting resin or thermoplastic resin.
  • the commutator 30 is attached to the rotating shaft 21 . Therefore, the commutator 30 rotates together with the rotating shaft 21 as the rotor 20 rotates. In this embodiment, the commutator 30 is attached to the second end 21b of the rotating shaft 21 . A commutator 30 attached to the rotating shaft 21 may be part of the rotor 20 .
  • the commutator 30 has a plurality of commutator pieces 31 (commutator segments) provided along the rotating direction of the rotating shaft 21 .
  • the plurality of commutator segments 31 are annularly arranged along the rotation direction of the rotation shaft 21 so as to surround the rotation shaft 21 .
  • Each commutator piece 31 is an elongated member extending in the longitudinal direction of the rotating shaft 21 .
  • the plurality of commutator segments 31 are conductive terminals made of a metal material such as copper.
  • the multiple commutator segments 31 are electrically connected to the coils 22 of the rotor 20 .
  • the plurality of commutator segments 31 are arranged insulated from each other.
  • the multiple commutator segments 31 are electrically connected by the coils 22 of the rotor 20 .
  • the commutator 30 is a molded commutator.
  • the commutator 30 has a configuration in which a plurality of commutator segments 31 are molded with molding resin. In this case, the plurality of commutator segments 31 are embedded in the molding resin so that their surfaces are exposed.
  • the mold resin is the commutator body.
  • the mold resin is a substantially tubular member having a through hole into which the rotary shaft 21 is inserted.
  • the mold resin is, for example, a molded resin body made of an insulating resin material such as a thermosetting resin.
  • At least one brush 40 is in contact with the commutator 30 .
  • the tip of the brush 40 is in contact with the commutator piece 31 of the commutator 30 . Since the commutator 30 rotates as the rotating shaft 21 rotates, the brush 40 keeps contacting all the commutator segments 31 sequentially.
  • the brush 40 is a power supply brush for supplying power to the coil 22. Specifically, the brush 40 supplies power to the coil 22 by contacting the commutator segments 31 of the commutator 30 .
  • the brush 40 is connected to a terminal 80 fixed to the brush holder 60 by a pigtail wire. The contact of the brushes 40 with the commutator segments 31 causes the armature current supplied from the terminals 80 to the brushes 40 to flow through the coils 22 via the commutator segments 31 .
  • the brush 40 is a conductive carbon brush made of carbon, and is a substantially elongated rectangular parallelepiped.
  • the brush 40 is preferably a carbon brush containing metal such as copper.
  • Such a brush 40 can be produced, for example, by pulverizing a kneaded material obtained by kneading graphite powder, copper powder, a binder resin, and a curing agent, compressing and molding the material into a rectangular parallelepiped, and firing the material.
  • a plurality of brushes 40 are provided. Specifically, as shown in FIGS. 3 and 5, the electric motor 1 is provided with two brushes 40 .
  • the two brushes 40 are arranged at 180° intervals along the rotation direction of the rotor 20 . That is, the angle formed by the longitudinal directions of the two brushes 40 is 180°.
  • the angle formed by the two brushes 40 may not be 180°, and may be 90° such as 60°. It may be below.
  • the brushes 40 are always in contact with the commutator segments 31 of the commutator 30 under pressure from the brush springs 50 . That is, the brushes 40 are pressed against the commutator 30 by the brush springs 50 . In this manner, the brushes 40 receive the pressing force from the brush springs 50 and come into sliding contact with the commutator 30 .
  • the brush 40 is arranged so as to be movable in a direction (radial direction) intersecting with the axial center C direction along which the rotating shaft 21 extends due to wear with the commutator 30 .
  • the brush springs 50 are provided according to the number of brushes 40. Since the electric motor 1 is provided with two brushes 40, two brush springs 50 are also provided.
  • the brush 40 and brush spring 50 are housed in a brush holder 60 and covered with a cover plate 70 .
  • the brush spring 50 applies pressure (spring pressure) to the brush 40 by spring elastic force (spring restoring force) to urge the brush 40 toward the commutator 30 .
  • spring pressure spring pressure
  • spring elastic force spring restoring force
  • the brush spring 50 is a constant force spring. Therefore, the brush spring 50 applies a uniform load to the brush 40 . That is, the brush spring 50, which is a constant force spring, applies a uniform pressing force to the brush 40. As shown in FIG. Note that the brush spring 50 is not limited to a constant force spring, and may be a compression coil spring, a torsion spring, or the like.
  • the brush spring 50 which is a constant load spring, is made of a strip-shaped wire rod.
  • the brush spring 50 which is a constant force spring, is a spiral spring.
  • a brush spring 50 which is a constant force spring, has a spiral portion 50a (coil portion) formed by spirally winding a strip-shaped wire.
  • the brush spring 50 which is a constant force spring, is made of, for example, a strip-shaped wire rod made of a metal material or the like.
  • the brush spring 50 which is a constant force spring, is made of a long strip-shaped metal plate. Therefore, the spiral portion 50a is a portion of the constant force spring in which a long strip-shaped metal plate is spirally wound multiple times only in one direction.
  • the brush spring 50 which is a constant force spring, generates a force (spring restoring force) to return to the original spiral state by extending one end of the wire rod from the spiral portion 50a.
  • the brush spring 50 presses the brush 40 against the commutator 30 with the spiral portion 50a. Specifically, the brush spring 50 imparts a load to the brush 40 by the spring restoring force of the spiral portion 50 a when the spiral portion 50 a contacts the rear end portion of the brush 40 .
  • the load with which the brush springs 50 press the brushes 40 against the commutator 30 is preferably at least 1 time the radial load generated during the rotation of the rotor 20 .
  • the brush spring 50 is arranged so that the spiral axis of the spiral portion 50a and the direction of the axis C along which the rotating shaft 21 extends are twisted. That is, the brush spring 50 is installed so that the spiral portion 50a is vertically placed, and the spiral surface (coil surface) of the spiral portion 50a is parallel to the axis C of the rotating shaft 21. As shown in FIG.
  • Electric power is supplied to the brushes 40 from an external power supply arranged outside the electric motor 1 via terminals 80 .
  • the external power supply is a power supply that exists outside the electric motor 1 .
  • the external power supply supplies the electric motor 1 with a predetermined input voltage.
  • the external power supply is a DC power supply that supplies the electric motor 1 with an input voltage of DC 12V.
  • the terminals 80 receive electric power that energizes the coils 22 of the rotor 20 via the brushes 40 . Specifically, since the external power supply is a DC power supply, the terminal 80 receives a DC voltage as an input voltage.
  • the electric motor 1 is provided with two terminals 80 .
  • one terminal (first terminal) of the two terminals 80 is the high voltage side terminal (positive terminal).
  • the other terminal (second terminal) of the two terminals 80 is the low voltage side terminal (minus terminal).
  • the two terminals 80 are attached to the brush holder 60 .
  • An electric wire 120 is connected to the terminal 80 .
  • Terminal 80 receives power from an external power source via wire 120 .
  • the electric wire 120 is a feeder line for supplying power to the terminal 80 .
  • the electric wire 120 is a harness.
  • the electric wire 120 is connected to each of the two terminals 80 . That is, two electric wires 120 are connected to the electric motor 1 .
  • the wire 120 connected to the terminal 80 which is the high-voltage side terminal, is the high-voltage side feeder line (positive side wiring).
  • the wire 120 connected to the terminal 80 which is the low-voltage side terminal, is the low-voltage side feeder line (negative side wiring).
  • Each electric wire 120 is an insulated wire such as a vinyl wire, and has a core wire made of a conductor such as copper and an insulating coating covering the core wire.
  • the brush 40 and the terminal 80 are connected by a pigtail wire. Specifically, one end of the pigtail wire is connected to the brush 40 . The other end of the pigtail wire is connected to terminal 80 . Electric power is supplied from an external power supply to the terminal 80 via the electric wire 120 , thereby supplying current to the brush 40 via the pigtail connected to the terminal 80 .
  • the current supplied to the brushes 40 flows through the coils 22 via the commutator segments 31 of the commutator 30 as armature current (driving current).
  • armature current driving current
  • magnetic flux is generated in the rotor 20 (coil 22).
  • the direction in which the current flows is switched depending on the positional relationship when the commutator segments 31 of the commutator 30 and the brushes 40 are in contact with each other.
  • FIG. 7 is a cross-sectional perspective view showing a configuration of part of the electric motor 1 according to the embodiment.
  • FIG. 8 is a perspective view of the terminal 80 used in the electric motor 1 according to the embodiment, viewed obliquely from above.
  • FIG. 9 is a perspective view of the terminal 80 used in the electric motor 1 according to the embodiment, viewed obliquely from below.
  • FIG. 10A is a top view showing the configuration of terminal 80 according to the embodiment.
  • FIG. 10B is a front view showing the configuration of terminal 80 according to the embodiment.
  • FIG. 10C is a left side view showing the configuration of terminal 80 according to the embodiment.
  • FIG. 10D is a right side view showing the configuration of terminal 80 according to the embodiment.
  • the brush holder 60 is a holding member that holds the brush 40 . As shown in FIG. 3 , the brush holder 60 is also an outer shell member forming the outer shell of the electric motor 1 . The brush holder 60 covers the second bracket 112 from the outside.
  • the brush holder 60 is made of, for example, an insulating resin material.
  • the brush holder 60 is a resin molded product formed by integral molding using a resin material.
  • the resin material forming the brush holder 60 is phenol resin.
  • the resin material forming the brush holder 60 is not limited to this.
  • the brush holder 60 has a brush storage portion 61 in which the brush 40 is stored.
  • the brush housing portion 61 is a concave portion formed in a concave shape.
  • the brush housing portions 61 are formed according to the number of brushes 40 .
  • the brush holder 60 is formed with two brush housings 61 .
  • Each of the two brush housing portions 61 is elongated in a direction orthogonal to the axis C of the rotating shaft 21 (that is, the radial direction of the rotation of the rotating shaft 21), and has a concave rectangular cross-sectional shape. .
  • the brush storage portion 61 stores the brush spring 50 together with the brush 40 . Therefore, the longitudinal length of the brush housing portion 61 is longer than the length of the brush 40 .
  • the brush spring 50 is arranged in the brush housing portion 61 so that the spiral portion 50 a is positioned behind the rear end portion of the brush 40 . In this case, the outer ends of the brush springs 50 are pulled out toward the commutator 30 through below the brushes 40 and fixed to the front bottom of the brush housing 61 .
  • a cover plate 70 is provided to cover the brushes 40 housed in the brush housing portion 61 .
  • the cover plate 70 covers the brushes 40 and the brush springs 50 housed in the brush housing portion 61 .
  • the cover plate 70 also has a function of guiding the spiral portion 50a of the brush spring 50 when the spiral portion 50a moves toward the commutator 30 as the brush 40 wears.
  • the cover plate 70 is formed with a recessed groove into which the upper portion of the spiral portion 50a is fitted. The spiral portion 50a moves while being guided by this groove.
  • the cover plate 70 is made of, for example, a metal plate.
  • the cover plate 70 is arranged to cover the brush housing portion 61 .
  • a terminal 80 is attached to the brush holder 60 .
  • a terminal 80 is a power supply terminal that receives power from an external power supply.
  • a wire 120 is connected to the terminal 80 .
  • Terminal 80 receives power through wire 120 .
  • a capacitor 90 is connected to the terminal 80 .
  • the capacitor 90 is a lead type capacitor (capacitor with leads).
  • Capacitor 90 has a body portion 91 .
  • the capacitor 90 has a pair of leads 92 (first lead, second lead).
  • the body part 91 has a pair of anode and cathode, an electrolyte and a dielectric disposed between the pair of anode and cathode, and an insulating outer shell member covering the pair of anode and cathode, the electrolyte and the dielectric.
  • the pair of leads 92 are lead pins (lead terminals) drawn out from the body portion 91 .
  • the pair of leads 92 are composed of conductive wires such as metal wires.
  • a pair of leads 92 are connected to the anode or cathode of the body portion 91 .
  • the capacitor 90 is a capacitor for noise reduction.
  • a capacitor 90 is connected in parallel between the pair of terminals 80 . That is, one lead 92 of the capacitor 90 is connected to one of the pair of terminals 80 . The other lead 92 of the capacitor 90 is connected to the other of the pair of terminals 80 .
  • the capacitance of the capacitor 90 is, for example, 0.001 ⁇ F. As a result, noise in the frequency band of 30-100 MHz can be effectively reduced.
  • the capacitor 90 preferably has excellent heat resistance.
  • Capacitor 90 is, for example, a ceramic capacitor. Note that the capacitance of the capacitor 90 is not limited to 0.001 ⁇ F, and is set according to the frequency of noise to be reduced. Note that two capacitors 90 are arranged in the electric motor 1 . Therefore, two capacitors 90 are connected in parallel to the pair of terminals 80 .
  • the terminal 80 has a plate-like top plate portion 81 and a plate-like standing plate portion 82 standing upright from the top plate portion 81 .
  • the top plate portion 81 functions as a mounting portion that is mounted on the brush holder 60 .
  • the upright plate portion 82 functions as a lead connection portion to which the lead 92 of the capacitor 90 is connected.
  • the terminal 80 further has a plate-shaped protruding plate portion 83 protruding outward from the top plate portion 81 when viewed from above.
  • the upright plate portion 82 is formed so as to hang down from the outer end portion of the projecting plate portion 83 .
  • the upright plate portion 82 and the projecting plate portion 83 are formed to be bent.
  • the upright plate portion 82 and the projecting plate portion 83 are formed to have an L-shaped cross section.
  • the protruding plate portion 83 protrudes laterally from the side end portion of the top plate portion 81 .
  • the projecting plate portion 83 is an extension portion that extends horizontally from the top plate portion 81 .
  • the protruding plate portion 83 protrudes from each of a pair of opposing side end portions of the top plate portion 81 . That is, a pair of projecting plate portions 83 are provided. The pair of protruding plate portions 83 are provided at positions facing each other with the top plate portion 81 interposed therebetween. Therefore, a pair of standing plate portions 82 are also provided.
  • Each of the upright plate portion 82 and the projecting plate portion 83 is a plate-like body having a constant width.
  • the upright plate portion 82 and the projecting plate portion 83 have the same width. Therefore, the standing plate portion 82 and the protruding plate portion 83 have a shape obtained by bending an elongated plate-like member having a constant width by 90 degrees.
  • An insertion hole 86 through which the lead 92 of the capacitor 90 is inserted is formed in the upright plate portion 82 .
  • a lead 92 of the capacitor 90 is inserted through the insertion hole 86 and electrically connected to the upright plate portion 82 .
  • the upright plate portion 82 functions as a lead connection portion to which the lead 92 of the capacitor 90 is connected.
  • the insertion holes 86 are formed in each of the pair of standing plate portions 82. As shown in FIG. In each upright plate portion 82 , an insertion hole 86 ( 86 a, 86 b ) is formed continuously from the upright plate portion 82 to the projecting plate portion 83 . Specifically, each insertion hole 86 (86a, 86b) is slit-shaped. Each insertion hole 86 ( 86 a , 86 b ) is formed so as to extend over the projecting plate portion 83 from the standing plate portion 82 .
  • each insertion hole 86 (86a, 86b) has a portion (first opening) formed in the standing plate portion 82 and a portion (second opening) formed in the projecting plate portion 83.
  • a portion (first opening) formed in the upright plate portion 82 is a portion that can be seen when the terminal 80 is viewed from the side.
  • a portion (second opening) formed in the projecting plate portion 83 is a portion that can be seen when the terminal 80 is viewed from above.
  • each insertion hole 86 is formed in an L shape along the L-shaped plate portion composed of the standing plate portion 82 and the projecting plate portion 83 .
  • one insertion hole 86a and the other insertion hole 86b have different opening lengths (slit lengths).
  • the pair of insertion holes 86 (86a, 86b) have the same length in the upright portion 82 portion.
  • the lengths of the portions of the pair of projecting plate portions 83 are different from each other.
  • the length of the insertion hole 86a formed in the projecting plate portion 83 is relatively short, and the length of the insertion hole 86b formed in the projecting plate portion 83 is relatively long. Things exist. Therefore, when viewed from above, the pair of insertion holes 86 (86a, 86b) appear to have different lengths.
  • the opening width (slit width) of the insertion holes 86 (86a, 86b) is constant.
  • the lead 92 inserted into the insertion hole 86a can be used as a positioning member. Therefore, workability can be improved.
  • the insertion hole 86a forms an opening that extends from the projecting plate portion 83 to the standing plate portion 82 in a slightly oblique direction. Therefore, one lead 92a can be easily inserted into the insertion hole 86a.
  • the rear surface of the protruding plate portion 83 also acts to promote positioning of one lead 92a inserted into the insertion hole 86a.
  • the insertion hole 86b has an opening in the projecting plate portion 83 that is longer than the insertion hole 86a.
  • the insertion hole 86a functions as a fulcrum for the inserted lead 92a. Therefore, the mounting position of the capacitor 90 having the insertion hole 86a as a fulcrum is easily determined.
  • the insertion hole 86b has a long opening with respect to the projecting plate portion 83. As shown in FIG.
  • the insertion hole 86b is longer than the projecting plate portion 83. Since it has an opening, the other lead 92b can be easily inserted.
  • the work of fixing the pair of leads 92 inserted into the pair of insertion holes 86 is performed. Specifically, while one lead 92a inserted into the insertion hole 86a is positioned, the other lead 92b inserted into the insertion hole 86b is soldered or crimped, or both soldered and crimped. Perform fixing work such as
  • the opening portion of the insertion hole 86a which is shorter than the insertion hole 86b, and the back surface portion of the projecting plate portion 83 act to hold one lead 92a. Therefore, one lead 92a is appropriately held in the insertion hole 86a.
  • the fixing work can be performed accurately and easily.
  • the fixing work on the insertion hole 86b side is completed. If the fixing work is performed in this order, it is possible to prevent the lead 92 from floating. Therefore, the fixing work can be efficiently performed.
  • This configuration can be expected to have a more pronounced effect particularly in the case of a lightweight electronic component such as the leaded capacitor described in the present embodiment.
  • the terminal 80 further has a pair of plate-like leg plate portions 84 .
  • a pair of leg plate portions 84 are formed so as to hang down from a pair of side end portions of the top plate portion 81 . That is, the pair of leg plate portions 84 are formed so as to be bent from the side end portions of the top plate portion 81 .
  • the pair of leg plate portions 84 function as fixing portions for fixing the terminal 80 to the brush holder 60 .
  • the pair of leg plate portions 84 are longer than the pair of standing plate portions 82 .
  • the terminal 80 has a pair of clamping plate portions 85 that clamp the core wire of the electric wire 120 . Therefore, the pair of clamping plate portions 85 function as wire connection portions to which the wires 120 are connected.
  • the pair of clamping plate portions 85 has a quick coupling structure. By inserting the electric wire 120 between the pair of clamping plate portions 85 , the electric wire 120 is clamped and fixed between the pair of clamping plate portions 85 . Thereby, the electric wire 120 and the terminal 80 are electrically connected. By providing a barb on the terminal connected to the electric wire 120, the fitting with the pair of clamping plate portions 85 can be reinforced.
  • One of the pair of holding plate portions 85 is formed by cutting and raising a portion of the top plate portion 81 on the back side of the top plate portion 81 .
  • the other of the pair of holding plate portions 85 is formed by bending the rear end portion of the top plate portion 81 toward the back side of the top plate portion 81 .
  • the terminal 80 is a conductive plate made of a conductive material such as a metal material.
  • terminal 80 is made of a copper alloy.
  • the terminal 80 is made of a metal plate with a constant thickness.
  • the terminal 80 is formed into a predetermined shape by bending a single metal plate. Therefore, the top plate portion 81, the standing plate portion 82, the protruding plate portion 83, the leg plate portion 84, and the clamping plate portion 85 are an integral body made of a metal plate having a uniform thickness.
  • the thickness of the metal plate forming the terminal 80 is, for example, 2 mm or less.
  • the thickness of the metal plate forming terminal 80 is 0.6 mm in this embodiment.
  • the brush holder 60 has a capacitor storage portion 62 (first capacitor storage portion, second capacitor storage portion) in which a capacitor 90 (first capacitor, second capacitor) is stored. .
  • the body portion 91 of the capacitor 90 is housed in the capacitor housing portion 62 .
  • the capacitor housing portion 62 is an arrangement space in which the capacitor 90 is arranged.
  • the capacitor housing portion 62 is a recess formed in a concave shape.
  • the brush holder 60 is formed with two capacitor storage portions 62 (a first capacitor storage portion and a second capacitor storage portion).
  • the two capacitors 90 (first capacitor, second capacitor) are arranged separately in two capacitor storage portions 62, respectively. Specifically, one body portion 91 of the two capacitors 90 is housed in one of the two capacitor housing portions 62 . The other body portion 91 of the two capacitors 90 is housed in the other of the two capacitor housing portions 62 .
  • the brush holder 60 has a terminal placement portion 63 in which the terminals 80 are placed.
  • Terminal placement portion 63 includes a placement surface on which top plate portion 81 of terminal 80 is placed. Specifically, the top plate portion 81 of the terminal 80 is placed in surface contact with the placement surface of the terminal placement portion 63 .
  • two terminals 80 a first terminal and a second terminal
  • the brush holder 60 is provided with two terminal placement portions 63 .
  • the two terminal placement portions 63 are provided at positions sandwiching the two capacitor storage portions 62 . Therefore, the capacitor housing portion 62 and the body portion 91 of the capacitor 90 housed in the capacitor housing portion 62 are positioned between the two terminal placement portions 63 .
  • the body portion 91 of the capacitor 90 housed in the capacitor housing portion 62 is positioned between the arrangement surface of the terminal placement portion 63 and the bottom surface of the capacitor housing portion 62 in the direction of the axis C of the rotating shaft 21 . Therefore, the body portion 91 of the capacitor 90 is positioned below the top plate portion 81 arranged in the terminal placement portion 63 .
  • Each terminal placement portion 63 is formed with an insertion hole 63a into which the leg plate portion 84 of the terminal 80 is inserted.
  • Two insertion holes 63 a are formed corresponding to the pair of leg plate portions 84 .
  • the leg plate portion 84 of the terminal 80 is fixed by being press-fitted into the insertion hole 63a.
  • the brush holder 60 has a step recess 64 that is formed to have a step with respect to the placement surface of the terminal placement portion 63 .
  • the bottom surface of the step recess 64 is positioned one step lower than the arrangement surface of the terminal arrangement portion 63 .
  • the bottom surface of the step recess 64 is located on the terminal placement portion 63 side (upper side) than the bottom surface of the capacitor housing portion 62 .
  • the standing plate portion 82 located inside extends toward the bottom surface of the step recess 64 .
  • a gap is formed between the inner upright plate portion 82 and the inner surface of the step recess 64 .
  • the inner upright plate portion 82 and the inner surface of the step recess 64 are not in contact with each other.
  • the inner upright plate portion 82 and the bottom surface of the step recess 64 may or may not be in contact with each other.
  • the standing plate portion 82 located on the outer side is inserted into the insertion hole 63 b formed in the brush holder 60 .
  • the outer upright plate portion 82 and the inner surface and the bottom surface of the insertion hole 63b may or may not be in contact with each other.
  • a wire insertion hole 65 through which the wire 120 is inserted is formed below the terminal placement portion 63 .
  • the wire insertion hole 65 extends in a direction perpendicular to the axis C of the rotating shaft 21 .
  • the electric wire 120 is inserted through the wire insertion hole 65 and held between the pair of holding plate portions 85 of the terminal 80 .
  • FIG. 11 is a cross-sectional view of a connection structure between terminals 80 and capacitors 90 in electric motor 1 according to the embodiment.
  • FIG. 12 is a side sectional view of a connection structure between terminals 80 and capacitors 90 in electric motor 1 according to the embodiment.
  • two capacitors 90 are arranged between a pair of terminals 80.
  • a pair of leads 92 (first lead, second lead) are bent toward a pair of terminals 80 .
  • one of the pair of leads 92 is connected to one of the pair of terminals 80 .
  • the other of the pair of leads 92 is connected to the other of the pair of terminals 80 . Therefore, the pair of leads 92 in each capacitor 90 are bent away from each other.
  • the pair of leads 92 of each capacitor 90 are connected to the inner upright plate portion 82 of the pair of upright plate portions 82 of each terminal 80 .
  • the pair of leads 92 of each capacitor 90 are inserted through insertion holes 86 formed in a standing plate portion 82 erected with respect to the top plate portion 81 . Therefore, the pair of leads 92 extend not in the direction of the axis C of the rotating shaft 21 (longitudinal direction) but in the direction perpendicular to the direction of the axis C of the rotating shaft 21 (lateral direction). In other words, the pair of leads 92 extends in a direction substantially parallel to the main surface of the top plate portion 81 as a whole.
  • leads 92 of two capacitors 90 are inserted through one insertion hole 86 .
  • the leads 92 of the two capacitors 90 are arranged one above the other in the vertical direction (in the direction of the axis C of the rotating shaft 21) in one insertion hole 86. As shown in FIG.
  • the opening width (slit width) of the insertion hole 86 is at least 1 time and less than 2 times the line width of the lead 92 of the capacitor 90 .
  • the opening width of the insertion hole 86 is equivalent to the line width of the lead 92 .
  • the lead 92 of the capacitor 90 inserted through the insertion hole 86 is joined to the upright plate portion 82 of the terminal 80 . Thereby, the lead 92 can be fixed to the upright portion 82 . As shown in FIG. 11, the lead 92 and the upright portion 82 are joined by a conductive adhesive 130 such as solder.
  • the lead 92 and the upright portion 82 may be joined together by caulking instead of being joined with the conductive adhesive 130, or may be joined with the conductive adhesive 130 after caulking. good.
  • FIG. 13A is a diagram showing how the terminal 80 is attached to the brush holder 60.
  • FIG. 13B is a diagram showing a state after the terminal 80 is attached to the brush holder 60.
  • FIG. 13C is a diagram showing how the first capacitor 90 is arranged in the brush holder 60.
  • FIG. 13D is a diagram showing how the body portion 91 of the first capacitor 90 is housed in the capacitor housing portion 62 of the brush holder 60 .
  • FIG. 13E is a diagram showing a state after the body portion 91 of the first capacitor 90 is housed in the capacitor housing portion 62 of the brush holder 60.
  • FIG. 13F shows the state after connecting the second capacitor 90 to the terminal 80.
  • two terminals 80 are attached to the brush holder 60 .
  • each terminal 80 is placed on the terminal placement portion 63 of the brush holder 60 .
  • the pair of upright plate portions 82 of the terminal 80 are inserted into the insertion hole 63b and the step recess 64, and the pair of leg plate portions 84 of the terminal 80 are inserted into the pair of insertion holes 63a.
  • the pair of leg plate portions 84 of the terminal 80 are press-fitted into the pair of insertion holes 63a.
  • the terminal 80 can be fixed to the brush holder 60 in the state shown in FIG. 13B.
  • the capacitor 90 is placed in the brush holder 60. Specifically, the capacitor 90 is connected to the pair of terminals 80 and arranged in the brush holder 60 . In this embodiment, two capacitors 90 are arranged.
  • a pair of pre-bent leads 92 are inserted into the insertion holes 86 of the pair of terminals 80, respectively.
  • the insertion hole 86 is not formed only in the upright plate portion 82 but is formed continuously from the top plate portion 81 to the protruding plate portion 83 that protrudes in the horizontal direction. In other words, the insertion hole 86 is visible in a top view and is open upward. Therefore, by moving the capacitor 90 downward, the pair of leads 92 of the capacitor 90 can be inserted into the insertion holes 86 of the pair of terminals 80 from above, respectively.
  • the body portion 91 of the capacitor 90 is rotated with the portion as a fulcrum. Specifically, the body portion 91 is rotated outward (front side in FIG. 13D).
  • the body portion 91 of the capacitor 90 can be housed in the capacitor housing portion 62 of the brush holder 60 .
  • the body portion 91 of the capacitor 90 is housed in the outer (front side) capacitor housing portion 62 of the two capacitor housing portions 62 . In this manner, the first capacitor 90 can be connected to the pair of terminals 80 and set in the brush holder 60 .
  • the second capacitor 90 is connected to the pair of terminals 80 and set in the brush holder 60 in the same manner as the first capacitor 90 .
  • the lead 92 of the second capacitor 90 is inserted through the insertion hole 86 through which the lead 92 of the first capacitor 90 is inserted. pile up.
  • the body portion 91 of the second capacitor 90 is divided into two capacitor storage portions 62 and arranged. Therefore, when housing the body portion 91 of the second capacitor 90 in the capacitor housing portion 62, the body portion 91 of the second capacitor 90 is placed in the opposite direction to the body portion 91 of the first capacitor 90 (Fig. 13F back side). As a result, the body portion 91 of the second capacitor 90 is accommodated in the inner (back side) capacitor accommodating portion 62 of the two capacitor accommodating portions 62 .
  • the leads 92 of the two capacitors 90 inserted through the insertion holes 86 of the terminals 80 and the upright portions 82 of the terminals 80 are bonded with the conductive adhesive 130.
  • solder is used as the conductive adhesive 130 .
  • the two leads 92 inserted through the pair of insertion holes 86 and the upright plate portion 82 are joined by soldering, and the two capacitors 90 are fixed to the pair of terminals 80. be.
  • solder fillets are formed in each upright plate portion 82 .
  • the upright plate portion 82 is positioned on the side of the top plate portion 81 . Therefore, the molten solder is applied laterally.
  • a solder fillet is formed horizontally as shown in FIG. Specifically, the solder fillet is formed on the outer surface of the upright plate portion 82 .
  • the solder may pass through the insertion hole 86 and reach the inner surface of the upright plate portion 82 .
  • a back fillet may also be formed inside the upright plate portion 82 .
  • the molten solder may drip onto the brush holder 60 .
  • the brush holder 60 is made of phenolic resin, which is a highly heat-resistant resin, even if melted solder drips onto the brush holder 60, the solder does not melt the brush holder 60.
  • the lead 92 and the upright plate portion 82 are bonded only with the conductive adhesive 130, the lead 92 and the upright plate portion 82 are not bonded together before the lead 92 and the upright plate portion 82 are bonded with the conductive adhesive 130. 82 may be crimped. By joining the lead 92 and the upright plate portion 82 with both the caulking and the conductive adhesive 130 in this way, the bondability between the capacitor 90 and the terminal 80 can be improved.
  • the terminal 80 to which the capacitor 90 is connected has the top plate portion 81 and the standing plate portion 82 erected with respect to the top plate portion 81 . ing. An insertion hole 86 through which the lead 92 of the capacitor 90 is inserted is formed in the upright plate portion 82 .
  • This configuration allows the leads 92 of the capacitor 90 to extend laterally rather than vertically. That is, the lead 92 of the capacitor 90 can be extended in a direction orthogonal to the axis C of the rotation shaft 21 instead of in the direction of the axis C of the rotation shaft 21 . As a result, even if the capacitor 90, which is a component with leads, is housed inside, it is possible to prevent the height (thickness) of the electric motor 1 from increasing. Therefore, the electric motor 1 can be made thinner.
  • the fillet of the conductive adhesive 130 is formed horizontally instead of vertically. Therefore, it is possible to prevent the height of the electric motor 1 from increasing due to the fillet.
  • the thickness of the motor can be reduced. can be planned. In other words, it is possible to achieve both EMC countermeasures and thinning.
  • the electric motor 1 according to the present embodiment is coreless, the inductance is low. Therefore, it is possible to realize a thin electric motor 1 having low inductance and high robustness against EMC, in which the capacity of the capacitor 90 can be selected according to the noise to be reduced.
  • the electric motor 1 includes a commutator, a brush 40 in contact with the commutator, a brush holder 60 that holds the brush 40 and has a capacitor storage portion 62 , and a brush holder 60 that is electrically connected to the brush 40 .
  • a body portion 91 housed in the capacitor housing portion 62; and leads 92 drawn out from the body portion 91.
  • the terminal 80 has a top plate portion 81 and an upright plate portion 82 erected with respect to the top plate portion 81 .
  • An insertion hole 86 through which the lead 92 is inserted is formed in the upright plate portion 82 .
  • the terminal 80 has a protruding plate portion 83 that protrudes outward from the top plate portion 81 when viewed from above, and the upright plate portion 82 has the protruding plate portion 83 depending from the outer end of the
  • the insertion hole 86 of the terminal 80 is formed continuously from the upright plate portion 82 to the projecting plate portion 83 .
  • the leads 92 of the capacitor 90 can be inserted through the insertion holes 86 simply by moving the capacitor 90 toward the top plate portion 81 (downward). Therefore, capacitor 90 can be easily connected to terminal 80 .
  • the brush holder 60 has the terminal placement portion 63 including the placement surface on which the top plate portion 81 is placed.
  • the body portion 91 of the capacitor 90 is positioned between the arrangement surface of the terminal placement portion 63 and the bottom surface of the capacitor housing portion 62 in which the body portion 91 of the capacitor 90 is housed.
  • the main body portion 91 of the capacitor 90 is positioned below the top plate portion 81 of the terminal 80, so mounting the capacitor 90 effectively reduces the height of the electric motor 1. can be suppressed.
  • the connecting portion between the lead 92 of the capacitor 90 and the terminal 80 is also positioned below the top plate portion 81 .
  • the electric motor 1 has a structure in which the leads 92 and the terminals 80 are joined under the top plate portion 81 . As a result, it is possible to effectively prevent the height of the electric motor 1 from increasing due to the joint structure between the leads 92 of the capacitor 90 and the terminals 80 .
  • the brush holder 60 has a step recess 64 formed to have a step with respect to the placement surface of the terminal placement portion 63 .
  • the upright plate portion 82 of the terminal 80 extends toward the bottom surface of the step recess 64 .
  • the leads 92 of the capacitor 90 can be easily inserted through the insertion holes 86 present in the upright plate portion 82 .
  • a gap is formed between the upright plate portion 82 of the terminal 80 and the inner surface of the stepped recess portion 64 of the brush holder 60 .
  • the lead 92 of the capacitor 90 when the lead 92 of the capacitor 90 is inserted through the insertion hole 86 existing in the upright plate portion 82 , the lead 92 is inserted through the insertion hole 86 in the gap between the upright plate portion 82 and the inner side surface of the step recess 64 .
  • the tip of the lead 92 can be arranged. Therefore, even if the lead 92 extends laterally and is inserted through the insertion hole 86, the leading end of the lead 92 can be prevented from becoming an obstacle.
  • the electric motor 1 has two terminals 80
  • the capacitor 90 has two leads 92
  • one of the two leads 92 is one of the two terminals 80
  • the other of the two leads 92 is connected to the other of the two terminals 80 .
  • the capacitor 90 can be connected in parallel to the two terminals 80 . Therefore, the capacitor 90 can effectively reduce noise.
  • the electric motor 1 has two capacitors 90 , and the lead 92 of each of the two capacitors 90 is inserted through the insertion hole 86 of the terminal 80 .
  • the two capacitors 90 can reduce noise more effectively.
  • the leads 92 of each of the two capacitors 90 are inserted through one insertion hole 86 . Therefore, even if two capacitors 90 are used, the connection between the terminals 80 and the leads 92 of the two capacitors 90 can be performed in the same manner as the connection between the leads 92 of one capacitor 90 and the terminals 80. .
  • the brush holder 60 has at least two capacitor storage portions 62 .
  • One body portion 91 of the two capacitors 90 is housed in one of the two capacitor housing portions 62 .
  • the other body portion 91 of the two capacitors 90 is housed in the other of the two capacitor housing portions 62 .
  • the two capacitors 90 can be divided and arranged in the two capacitor housing portions 62 . Therefore, even if two capacitors 90 are used, it is possible to prevent the height of electric motor 1 from increasing.
  • the two capacitors 90 are arranged separately in the two capacitor storage portions 62 in the brush holder 60 .
  • the two capacitors 90 may be arranged in only one of the two capacitor storage portions 62 in the brush holder 60, as in the electric motor 1A shown in FIG.
  • FIG. 14 is a perspective view showing a configuration of a brush holder 60 to which various parts are attached in an electric motor 1A according to Modification 1.
  • the body portion 91 of each of the two capacitors 90 may be housed in one capacitor housing portion 62 .
  • FIG. FIG. 15 is a perspective view showing the configuration of a brush holder 60 to which various parts are attached in an electric motor 1B according to Modification 2.
  • FIG. 16 is a cross-sectional view of an electric motor 1B according to Modification 2.
  • one capacitor 90 is housed in one of the two capacitor housing portions 62 in the brush holder 60.
  • three or more capacitors 90 may be connected in parallel between the pair of terminals 80 .
  • FIG. 17 is an enlarged cross-sectional view of an electric motor according to Modification 3.
  • FIG. 18 when there is only one capacitor 90, the sealing agent 140 may be formed only in the capacitor accommodating portion 62 in which the body portion 91 is accommodated.
  • FIG. 18 is an enlarged cross-sectional view of an electric motor according to Modification 4.
  • the sealant 140 may be formed only in the capacitor housing portion 62 housing the two body portions 91. As a result, the two main body portions 91 can be covered with the sealant 140 by applying the sealant 140 once.
  • the sealant 140 is made of, for example, an insulating resin material whose main component is a resin material such as silicone.
  • the sealing agent 140 can be formed by applying a liquid insulating resin material to the capacitor housing portion 62 and solidifying it. Note that the sealing agent 140 may be filled in the capacitor accommodating portion 62 so that the entire body portion 91 is embedded.
  • the leads 92 of the two capacitors 90 are stacked vertically in the insertion holes 86 of the upright plate portions 82 of the terminals 80 .
  • the leads 92 of the two capacitors 90 may be arranged side by side in the insertion hole 86 .
  • the opening width of the insertion hole 86 is at least twice the line width of the lead 92 .
  • the electric motor 1 has only one bearing 100 .
  • the electric motor 1 may have two bearings.
  • one of the two bearings can be attached to the first end 21 a of the rotating shaft 21 and one of the two bearings can be attached to the second end 21 b of the rotating shaft 21 .
  • the electric motor 1 is a coreless motor in which the stator 10 and the rotor 20 do not have cores.
  • the electric motor 1 may be an electric motor in which the stator 10 and the rotor 20 have cores.
  • the stator 10 is composed only of permanent magnets.
  • the stator 10 may be a stator composed of permanent magnets and an iron core, or an armature composed of stator windings and an iron core without using permanent magnets.
  • the electric motor 1 is a flat motor with an outer shape whose thickness is smaller than its outer diameter.
  • the technology of the present disclosure can also be applied to, for example, a cylindrical electric motor having a cylindrical housing with an outer size whose thickness is greater than its outer diameter.
  • the direction of the main magnetic flux generated by the stator 10 and the rotor 20 is the direction of the axis C of the rotating shaft 21 .
  • the direction of the main magnetic flux generated by the stator 10 and the rotor 20 may be a direction orthogonal to the axial center C direction of the rotating shaft 21 (radial direction of rotation of the rotating shaft 21).
  • the technology of the present disclosure can also be applied to an inner rotor type motor in which the rotor 20 is arranged inside the stator 10 .
  • the electric motor 1 is a vehicle motor used in a vehicle. However, it is not limited to this.
  • the technology of the present disclosure can also be applied to electric motors used in various other electric devices, such as electric motors used in electric blowers and the like mounted on electric vacuum cleaners and the like.
  • the terminal 80 has been described as a component to which the capacitor 90 is connected. However, it is not limited to this. That is, the terminal 80 may be used as a component to which an electronic component with leads other than the capacitor 90 is connected. In this case, the leads of the leaded electronic component are inserted through the insertion holes 86 of the upright plate portion 82 of the terminal 80 .
  • the technology of the present disclosure can be widely used in various products equipped with electric motors, including products in the field of electric equipment such as automobiles and the field of household electric appliances.
  • Reference Signs List 1 1A, 1B Electric motor 10 Stator 20 Rotor 21 Rotating shaft 21a First end 21b Second end 22 Coil 23 Molded resin 30 Commutator 31 Commutator piece 40 Brush 50 Brush spring 50a Spiral part 60 Brush holder 61 Brush housing Part 62 capacitor storage part (first capacitor storage part, second capacitor storage part) 63 Terminal placement portion 63a, 63b Insertion hole 64 Step recess 65 Wire insertion hole 70 Cover plate 80 Terminal (first terminal, second terminal) 81 Top plate portion 82 Standing plate portion 83 Protruding plate portion 84 Leg plate portion 85 Clamping plate portion 86, 86a, 86b Insertion hole 90 Capacitor (first capacitor, second capacitor) 91 main body 92, 92a, 92b leads (first lead, second lead) Reference Signs List 100 bearing 111 first bracket 112 second bracket 120 electric wire 130 conductive adhesive 140 sealant

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Motor Or Generator Frames (AREA)

Abstract

La présente invention concerne un moteur électrique comprenant : un collecteur ; un balai qui entre en contact avec le collecteur ; un support de balai qui maintient le balai et comporte une partie boîtier de condensateur ; une borne qui est connectée électriquement au balai ; et un condensateur ayant une partie corps qui est logée dans la partie boîtier de condensateur et un fil qui sort de la partie corps. La borne comprend une partie plaque supérieure et une partie plaque verticale qui est installée de manière verticale par rapport à la partie plaque supérieure. La partie plaque verticale est formée avec un trou d'insertion dans lequel le fil est inséré.
PCT/JP2022/037990 2021-12-21 2022-10-12 Moteur électrique et borne WO2023119801A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2021-206819 2021-12-21
JP2021206819 2021-12-21

Publications (1)

Publication Number Publication Date
WO2023119801A1 true WO2023119801A1 (fr) 2023-06-29

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2022/037990 WO2023119801A1 (fr) 2021-12-21 2022-10-12 Moteur électrique et borne

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WO (1) WO2023119801A1 (fr)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5529952U (fr) * 1978-08-15 1980-02-27
JP2009232585A (ja) * 2008-03-24 2009-10-08 Mitsuba Corp ワイパモータ
WO2015004795A1 (fr) * 2013-07-12 2015-01-15 株式会社ミツバ Dispositif de moteur
US20150123504A1 (en) * 2013-11-04 2015-05-07 Robert Bosch Gmbh Interference suppression device
JP2018007387A (ja) * 2016-06-30 2018-01-11 株式会社ミツバ モータ装置
US20190149020A1 (en) * 2016-06-09 2019-05-16 Lg Innotek Co., Ltd. Ground terminal, cover assembly and motor comprising same
JP2020171081A (ja) * 2019-04-01 2020-10-15 株式会社ミツバ モータ装置

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5529952U (fr) * 1978-08-15 1980-02-27
JP2009232585A (ja) * 2008-03-24 2009-10-08 Mitsuba Corp ワイパモータ
WO2015004795A1 (fr) * 2013-07-12 2015-01-15 株式会社ミツバ Dispositif de moteur
US20150123504A1 (en) * 2013-11-04 2015-05-07 Robert Bosch Gmbh Interference suppression device
US20190149020A1 (en) * 2016-06-09 2019-05-16 Lg Innotek Co., Ltd. Ground terminal, cover assembly and motor comprising same
JP2018007387A (ja) * 2016-06-30 2018-01-11 株式会社ミツバ モータ装置
JP2020171081A (ja) * 2019-04-01 2020-10-15 株式会社ミツバ モータ装置

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