WO2023007949A1 - チョークコイルの固定構造及びモータ - Google Patents
チョークコイルの固定構造及びモータ Download PDFInfo
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- WO2023007949A1 WO2023007949A1 PCT/JP2022/022666 JP2022022666W WO2023007949A1 WO 2023007949 A1 WO2023007949 A1 WO 2023007949A1 JP 2022022666 W JP2022022666 W JP 2022022666W WO 2023007949 A1 WO2023007949 A1 WO 2023007949A1
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- Prior art keywords
- choke coil
- space
- elastic
- terminal
- brush
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- 238000003825 pressing Methods 0.000 claims abstract description 73
- 230000004308 accommodation Effects 0.000 claims abstract description 32
- 229910000859 α-Fe Inorganic materials 0.000 claims abstract description 9
- 230000002093 peripheral effect Effects 0.000 claims description 27
- 239000002184 metal Substances 0.000 claims description 9
- 229920005989 resin Polymers 0.000 claims description 8
- 239000011347 resin Substances 0.000 claims description 8
- 238000005452 bending Methods 0.000 claims description 4
- 239000000853 adhesive Substances 0.000 description 10
- 230000001070 adhesive effect Effects 0.000 description 10
- 239000000463 material Substances 0.000 description 8
- 238000000034 method Methods 0.000 description 5
- 230000007547 defect Effects 0.000 description 4
- 238000004804 winding Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229920001875 Ebonite Polymers 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
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- 238000012986 modification Methods 0.000 description 1
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Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K23/00—DC commutator motors or generators having mechanical commutator; Universal AC/DC commutator motors
- H02K23/66—Structural association with auxiliary electric devices influencing the characteristic of, or controlling, the machine, e.g. with impedances or switches
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
- H02K11/02—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection for suppression of electromagnetic interference
- H02K11/026—Suppressors associated with brushes, brush holders or their supports
-
- 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
- H02K5/143—Means for supporting or protecting brushes or brush holders for cooperation with commutators
- H02K5/145—Fixedly supported brushes or brush holders, e.g. leaf or leaf-mounted brushes
Definitions
- the present invention relates to a choke coil fixing structure electrically connected to brushes that are in sliding contact with a commutator, and a motor to which this choke coil fixing structure is applied.
- brushed motors are known to be provided with choke coils that electrically connect the brushes and terminals in order to reduce noise generated from sliding contact portions between the commutator and the brushes. . If the choke coil is loosely fixed, the choke coil may vibrate while the motor is being driven, causing disconnection or noise. Therefore, there is a demand for securely fixing the choke coil, and various methods have been proposed so far.
- Patent Document 1 discloses a motor comprising a brush held by a brush holder attached to a holder base and a choke coil connected to the brush. It is disclosed to sandwich and hold the choke coil between holding walls. According to Patent Document 1, by sandwiching and holding the choke coil between a pair of holding walls, there is no gap between the holding walls and the choke coil, and abnormal noise caused by vibration of the choke coil is suppressed. It is said that it can be reduced.
- a choke coil fixing structure disclosed herein is a choke coil fixing structure that is electrically connected to brushes that are in sliding contact with a commutator and that accommodates a ferrite core therein, wherein the choke coil is mounted.
- a bottom surface on which the choke coil is placed a bottom surface on which the choke coil is placed; an accommodation wall portion erected from the bottom surface and forming, together with the bottom surface, a first space for accommodating the choke coil; and an elastic portion that is elastically deformable, and the elastic portion is urged toward the inside of the first space to press the choke coil via the elastic portion, thereby separating the choke coil from the inner surface of the housing wall portion. and a pressing portion fixed therebetween.
- the housing wall portion and the elastic portion are made of resin, and the pressing portion is made of metal.
- the choke coil fixing structure includes a second space that is provided adjacent to the first space with a portion of the containing wall portion interposed therebetween and that houses the pressing portion.
- the pressing portion is provided separately from both the accommodating wall portion and the elastic portion, and the elastic portion stands between the first space and the second space of the accommodating wall portion. It is preferable to provide between two slits formed from a part of the edge of the housing wall portion to the bottom surface portion.
- the thickness of the elastic portion on the side of the bottom surface is thinner than the thickness on the side of the edge.
- the housing wall portion has a pair of side surface portions extending in the axial direction of the choke coil in the housing state in which the choke coil is housed in the first space.
- the elastic portion is provided at a position facing the outer peripheral surface of the choke coil on one of the side portions when the choke coil is accommodated, and the bottom portion and the other side portion are provided on the choke coil.
- the pressing portion is curved along the outer peripheral surface of the coil, and the pressing portion fixes the choke coil between the inner surface of the other side portion and the bottom portion via the elastic portion.
- the choke coil fixing structure preferably includes a metal terminal accommodated in a third space provided at a position separated from the first space.
- the pressing portion is provided at a position facing a part of the housing wall portion of the terminal when the terminal is housed in the third space.
- the terminal is provided with a U-shaped slit that opens toward the bottom surface portion while the terminal is accommodated in the third space. preferably.
- the pressing portion is provided by plastically deforming the portion defined by the U-shaped slit by bending along a folding line connecting the ends of the U-shaped slit.
- the motor disclosed herein is a motor comprising a stator and a rotor, comprising brushes in sliding contact with a commutator that rotates integrally with the rotor, and choke coils electrically connected to the brushes, wherein the choke
- the choke coil fixing structure according to any one of the above (1) to (7) is applied to the coil.
- the choke coil can be mechanically fixed without using an adhesive, and the fixed state can be maintained for a long period of time.
- FIG. 1 is an axial half-sectional view of a motor according to an embodiment
- FIG. FIG. 2 is a front view of an end bell included in the motor of FIG. 1
- FIG. 3 is a view of the end bell of FIG. 2 with the brushes, brush arms, brush terminals and choke coils removed
- 4 is a perspective view of the end bell of FIG. 3
- FIG. 3 is a cross-sectional view taken along line XX of FIG. 2
- Figure 3 is a perspective view of the end bell of Figure 2;
- a choke coil fixing structure and a motor as an embodiment will be described with reference to the drawings.
- the embodiments shown below are merely examples, and there is no intention to exclude various modifications and application of techniques not explicitly described in the embodiments below.
- Each configuration of this embodiment can be modified in various ways without departing from the gist thereof. Also, they can be selected or combined as needed.
- FIG. 1 is an axial half-sectional view of a motor 1 of this embodiment.
- the motor 1 of this embodiment is a permanent magnet field type brushed DC motor, and has a stator 3 , a rotor 4 , an end bell 5 , and an end plate 6 .
- a rotor 4 is arranged in a cylindrical stator 3 . That is, the motor 1 is a so-called inner rotor type motor.
- the rotor 4 has a shaft 41 and rotates around the center line Lr of the shaft 41 .
- the centerline Lr of the shaft 41 is also the centerline of the motor 1 (rotor 2).
- the direction in which the center line Lr extends will be referred to as the axial direction
- the direction perpendicular to the center line Lr will be referred to as the radial direction
- the direction that rotates around the center line Lr will be referred to as the circumferential direction.
- the stator 3 of this embodiment has an auxiliary yoke 31 , magnets 32 and magnet pins 33 .
- the auxiliary yoke 31 has a bottomed cylindrical shape with an opening 31a formed on one side (right side in the drawing) of the center line Lr and a bottom portion 31b on the other side (left side in the drawing).
- a circular hole portion 31c is provided through the center of the bottom portion 31b of the auxiliary yoke 31 .
- a bearing 7 that rotatably supports the other side of the shaft 41 is fitted in the hole 31c.
- a plurality of magnets 32 are provided along the inner peripheral surface of the auxiliary yoke 31 at intervals in the circumferential direction.
- the magnet 32 is arranged at a position facing a later-described core 42 (hereinafter referred to as “rotor core 42 ”) of the rotor 4 in a state where the rotor 4 is incorporated in the stator 3 , and extends in the axial direction so as to surround the rotor core 42 . is set.
- the magnet pin 33 is provided between the auxiliary yoke 31 and the magnet 32 to fix the magnet 32 to the auxiliary yoke 31 .
- the rotor 4 includes a shaft 41 , a rotor core 42 , windings 43 and a commutator 44 .
- the shaft 41 is a rotating shaft that supports the rotor 4, and also functions as an output shaft that extracts the output of the motor 1 to the outside.
- the rotor core 42 is a laminated core in which a plurality of steel plates having the same shape are laminated.
- the shaft 41 is fixed to the center of the rotor core 42 with the axial direction aligned with the direction in which the steel plates are laminated, and the rotor core 42 rotates integrally with the shaft 41 .
- the winding 43 forms a coil by being wound around the rotor core 42, and generates magnetic force when current flows.
- the commutator 44 is press-fitted and fixed to the outer circumference of one side of the shaft 41 (the side closer to the opening 31 a than the rotor core 42 ), and is attached to the rotor core 42 so that the circumferential position is defined, and rotates integrally with the rotor 4 . do.
- the end bell 5 is a member that is fitted in the opening 31 a of the auxiliary yoke 31 and supports the brush 11 that is in sliding contact with the commutator 44 .
- the end bell 5 is formed in a cylindrical shape (substantially cylindrical in this embodiment) having an outer peripheral surface corresponding to the shape of the inner peripheral surface of the opening 31 a of the auxiliary yoke 31 , and is arranged coaxially with the shaft 41 .
- a space Sr an axially penetrating space, hereinafter referred to as a “central space Sr” in which the shaft 41 and the commutator 44 are arranged is formed radially inside the end bell 5 .
- the end plate 6 is a lid member fixed to one side of the end bell 5 .
- the end plate 6 has a hole 6a into which the shaft 41 is inserted and a bearing 8 that rotatably supports one side of the shaft 41 is fitted.
- the opening 31a of the auxiliary yoke 31 is closed by the end bell 5 and the end plate 6, but the structure for closing the opening 31a is not limited to this.
- FIG. 2 shows a front view of the end bell 5 viewed from the other side.
- a brush 11, a brush arm 12, a brush terminal 13 (terminal), a power supply terminal 14 (terminal), and a choke coil 15 are attached to the end bell 5.
- the brushes 11 are, for example, brushes containing carbon as a main component, and a pair of the brushes 11 are provided on the end bell 5 .
- the pair of brushes 11 are arranged to face each other across the center line Lr in the central space Sr of the end bell 5 in the radial direction.
- the commutator 44 is arranged between the pair of brushes 11 .
- the brush arm 12 is a conductive thin plate-like member, and is provided for mounting the brush 11 in the above-described central space Sr. One end of the brush arm 12 is bent and joined to the brush terminal 13 . The brush 11 is attached to and supported by the other end of the brush arm 12 . Both the pair of brushes 11 and the pair of brush arms 12 are arranged substantially point-symmetrically about the center line Lr.
- the brush terminal 13 , power supply terminal 14 and choke coil 15 are provided one by one for each of the pair of brushes 11 .
- These parts 13 to 15 are electrically connected to one brush 11 in the order of brush terminal 13, choke coil 15 and power supply terminal 14.
- the brush terminals 13, power supply terminals 14, and choke coils 15 electrically connected to each of the pair of brushes 11 are also arranged substantially point-symmetrically about the center line Lr. The structure and arrangement of each of the parts 13-15 will be described in detail below. In the following description, attention will be paid to the components 12 to 15 that are electrically connected to one of the pair of brushes 11, unless otherwise specified.
- the brush terminal 13 is a metal terminal.
- the brush terminal 13 is formed in the shape of a crank when viewed in the axial direction. , and an inclined portion 13c continuous with the connecting portion 13b.
- the joint portion 13 a extends tangentially to the outer peripheral surface of the end bell 5 .
- One end of the brush arm 12 is joined to one end (the end on the brush 11 side) of the joining portion 13a.
- the brush terminal 13 is electrically connected to the brush 11 via the brush arm 12 .
- the connecting portion 13b extends from the other end of the joint portion 13a while being bent in a direction (diameter direction inner side) substantially perpendicular to the extending direction of the joint portion 13a.
- An inclined portion 13c bends and extends in a direction away from the joint portion 13a from the end of the connecting portion 13b to which the joint portion 13a is not connected.
- the inclined portion 13c of the present embodiment is slightly inclined with respect to the joint portion 13a. Extend.
- the direction in which the inclined portion 13c extends with the brush terminal 13 attached to the end bell 5 will also be referred to as the "first direction”.
- the power supply terminal 14 is a metal terminal that receives power supply from an external power supply. Electric power supplied from an external power supply to the power supply terminal 14 passes through the choke coil 15, the brush terminal 13, the brush arm 12 and the brush 11 in this order, and is supplied to the winding 43 (coil).
- the feed terminal 14 is provided at a radially outer position at a position substantially in phase with the electrically unconnected (that is, another) brush 11 and extends tangentially to the outer peripheral surface of the end bell 5 at that position. exist.
- the power supply terminal 14 is provided at a position shifted by approximately 90 degrees clockwise from the joint portion 13a of the brush terminal 13 to which it is electrically connected, so that the joint portion 13a of the brush terminal 13 extends. It extends in a direction perpendicular to the direction.
- the choke coil 15 is, for example, a cylindrical component in which a metal wire is spirally wound. Inside the choke coil 15, a columnar ferrite core 16 is accommodated in a substantially coaxial arrangement. In other words, it can be said that the choke coil 15 is a coil wound around the ferrite core 16 .
- the choke coil 15 is arranged radially inside the joint 13 a of the brush terminal 13 .
- the choke coil 15 is arranged so that its axis Lc direction extends in the extending direction of the inclined portion 13c of the brush terminal 13, that is, parallel to the first direction.
- One end of the wire forming the choke coil 15 is connected to the brush terminal 13 and the other end is connected to the power supply terminal 14 .
- the choke coil 15 reduces noise generated from the sliding contact portion between the brush 11 and the commutator 44 .
- FIG. 3 is a view of FIG. 2 with the parts 11 to 13 and 15 removed (a front view of the other side before these parts 11 to 13 and 15 are arranged on the end bell 5).
- 4 is a perspective view of the end bell 5 of FIG.
- the end bell 5 includes a peripheral wall portion 50 forming the outer shape of the end bell 5, and radially inside the peripheral wall portion 50, the brush terminal 13, the feed terminal 14, and the choke coil 15 are arranged as described above. It is provided with three types of mounting portions 51, 52, 53 for mounting to positions.
- the outer peripheral surface of the peripheral wall portion 50 has a shape corresponding to the shape of the inner peripheral surface of the opening 31 a of the auxiliary yoke 31 .
- the end bell 5 including the peripheral wall portion 50 and the mounting portions 51, 52, 53 is integrally molded using a resin material.
- a first attachment portion 51 for attaching the brush terminal 13 is provided at a portion of the peripheral wall portion 50 that is partially bulged radially inward.
- the first attachment portion 51 is provided with a groove that forms a terminal accommodation space St (third space) capable of accommodating the brush terminal 13 toward one side from the other end face of the first attachment portion 51 .
- the groove forming the terminal accommodating space St has a crank shape when viewed in the axial direction corresponding to the shape of the brush terminal 13 described above.
- the brush terminal 13 is fitted and fixed in the terminal accommodating space St.
- the first mounting portion 51 is provided with a groove c that communicates the terminal accommodating space St and the central space Sr from the other end surface of the first mounting portion 51 toward one side.
- One end of the brush arm 12 is arranged in this groove c.
- a second attachment portion 52 for attaching the power supply terminal 14 is provided at a portion of one side of the peripheral wall portion 50 that bulges inward in the radial direction at the position where the power supply terminal 14 is provided.
- a groove (not shown) extending in the tangential direction is provided in the second mounting portion 52 toward one side, and a portion of the power supply terminal 14 is inserted and fixed in this groove.
- a third mounting portion 53 for mounting the choke coil 15 includes a bottom portion 55 in which a portion of one side of the first mounting portion 51 extends radially inward, and a bottom portion 55 extending from the bottom portion 55 toward the other side (that is, and a housing wall portion 56 erected (axially).
- the bottom surface portion 55 of the present embodiment is formed between the vicinity of the end of the brush terminal 13 fitted in the first mounting portion 51 opposite to the end on the brush 11 side and the second mounting portion 52 . placed widely in between.
- the choke coil 15 is placed on the bottom portion 55 .
- the bottom surface portion 55 is provided corresponding to the arrangement of the choke coils 15 described above, and is formed in a substantially rectangular shape having long sides extending in the first direction when viewed in the axial direction.
- the housing wall portion 56 is a wall portion that surrounds the choke coil 15 placed on the bottom portion 55 .
- a portion of the first mounting portion 51 located radially inward of the terminal accommodating space St is included in the accommodating wall portion 56 .
- a choke coil accommodation space Sc (first space) in which the choke coil 15 is accommodated is formed in the third mounting portion 53 by the bottom surface portion 55 and the accommodation wall portion 56 .
- the choke coil accommodation space Sc is provided apart from the terminal accommodation space St of the first mounting portion 51, and is adjacent to a portion of the terminal accommodation space St where the inclined portion 13c of the brush terminal 13 is located.
- the accommodation wall 56 extends in the direction of the axis Lc of the choke coil 15 (first direction). ) extending perpendicularly to the direction of the axis Lc of the choke coil 15 and facing the ends of the choke coil 15 in the direction of the axis Lc. It has wall portions 56c and 56d. That is, the housing wall portion 56 of the present embodiment is formed in a substantially rectangular shape when viewed in the axial direction.
- the distance between the two side wall portions 56a and 56b is set longer than the outer diameter dimension of the choke coil 15. Therefore, when the choke coil 15 is not fixed by an elastic portion 57 and a pressing portion 17, which will be described later, in the housed state, a slight gap is formed between at least one of the side wall portions 56a and 56b and the choke coil 15. be. Also, the distance between the two end wall portions 56c and 56d is made equal to the length of the ferrite core 16 in the direction of the axis Lc. As a result, the end walls 56c and 56d come into contact with the ferrite core 16 and regulate the position of the choke coil 15 in the direction of the axis Lc.
- the outer wall portion 56a positioned radially outward is formed by a portion of the first mounting portion 51 radially inner than the terminal accommodating space St.
- FIG. 5 is a cross-sectional view taken along line XX in FIG.
- the bottom surface portion 55 and the inner wall portion 56 b located radially inward of the two side wall portions 56 a and 56 b form a smooth (continuous line without steps) along the outer peripheral surface of the choke coil 15 . formed into a curved surface.
- the portion of the outer wall portion 56 a on the bottom surface portion 55 side is also formed in a smooth curved shape along the outer peripheral surface of the choke coil 15 .
- hatching indicating cross sections of the choke coil 15 and the ferrite core 16 is omitted.
- FIG. 6 is a perspective view of the end bell 5 of FIG. 2.
- FIG. 6 from the viewpoint of facilitating visual recognition of the structures of the brush terminal 13 and a pressing portion 17, which will be described later, one of the pair of brushes 11 (the brush 11 on the lower side of the paper surface), a brush arm 12 connected thereto, and a brush terminal 13 are shown. and are partially pulled out to the other side (state before completion of arrangement).
- the choke coil 15 is loosely fixed, it may vibrate while the motor 1 is being driven, causing disconnection or noise. Moreover, even if it is firmly fixed at the beginning of assembly (when the motor 1 is completed), the fixation may loosen as it is used continuously. Therefore, the choke coil 15 is required to continue to be firmly fixed to the end bell 5 even during continued use.
- the choke coil 15 fixing structure of the present embodiment is a structure for maintaining the fixed state of the choke coil 15 for a long period of time. It has an elastically deformable elastic portion 57 formed by cutting and a pressing portion 17 that urges the elastic portion 57 toward the inside of the choke coil housing space Sc.
- the pressing portion 17 presses the elastic portion 57 toward the inside of the choke coil housing space Sc, thereby pressing the choke coil 15 via the elastic portion 57.
- the choke coil 15 is firmly fixed to the inner surface of the housing wall portion 56 .
- the pressing portion 17 of this embodiment is provided on the inclined portion 13 c of the brush terminal 13 . That is, the pressing portion 17 is provided separately from both the housing wall portion 56 and the elastic portion 57 .
- the brush terminal 13 is provided with a U-shaped slit a1 that opens toward the bottom surface portion 55 side (one side) when the brush terminal 13 is housed in the terminal housing space St.
- a portion of the pressing portion 17 defined by the U-shaped slit a1 is bent toward the inner side (inward in the radial direction) of the choke coil housing space Sc along a folding line b (see FIG. 5) connecting the ends of the U-shaped slit a1. It is provided by being plastically deformed.
- the U-shaped slit a1 of this embodiment is provided with a corner portion at the corner portion, the corner portion may be arc-shaped.
- the brush terminal 13 is housed in the terminal housing space St of the first attachment portion 51, so the terminal housing space St houses the pressing portion 17 as indicated by the dot pattern in FIG. It can be said that it contains space.
- a portion of the terminal accommodation space St where the pressing portion 17 is positioned when the brush terminal 13 is accommodated in the terminal accommodation space St will be referred to as a pressing portion accommodation space Sp (second space). Since the portion of the terminal accommodation space St where the inclined portion 13c of the brush terminal 13 is located is adjacent to the choke coil accommodation space Sc, the pressing portion accommodation space Sp is also adjacent to the choke coil accommodation space Sc.
- the elastic portion 57 is provided on a part of the outer wall portion 56a. More specifically, the elastic portion 57 is provided in a portion of the outer wall portion 56a that stands between the choke coil accommodating space St and the pressing portion accommodating space Sp. That is, it can be said that the above-described pressing portion accommodation space Sp is provided adjacent to the choke coil accommodation space St with the elastic portion 57 interposed therebetween.
- the elastic portion 57 is provided at a position of the outer wall portion 56a facing the outer peripheral surface of the choke coil 15 in the accommodated state. As shown in FIG. 6, a portion of the outer wall portion 56a is provided with two slits a2 that are formed from the other edge portion of the outer wall portion 56a toward the bottom surface portion 55 side. The elastic portion 57 is provided between the two slits a2 and faces the outer peripheral surface of the choke coil 15 in the accommodated state.
- the portion of the elastic portion 57 on the bottom surface portion 55 side (hereinafter referred to as the "base end portion") is connected to the first mounting portion 51 .
- the elastic portion 57 is configured to be elastically deformable inside the choke coil housing space Sc with the base end portion as a base point.
- the elastic portion 57 is configured to be elastically deformable toward the inner side of the choke coil housing space Sc and toward the bottom surface portion 55 (that is, in a direction oblique to the axial direction).
- the pressing portion 17 abuts against the elastic portion 57 and pushes the elastic portion 57 out of the choke coil accommodation space Sc. Elastically deform inward. As a result, the choke coil 15 is urged inward in the radial direction, and adheres tightly to the curved inner surfaces of the inner wall portion 56b and the bottom surface portion 55 that are positioned diagonally across the axis Lc of the choke coil 15 .
- the elastic portion 57 of the present embodiment is recessed so that the base end portion (specifically, the surface on the side of the choke coil housing space Sc) is slightly convex radially outward.
- the elastic portion 57 is formed so that the plate thickness on the bottom portion 55 side is thinner than the plate thickness on the edge portion side (other side). This makes it easier to elastically deform with the base end portion on the side of the bottom surface portion 55 as a base point.
- the thickness of the elastic portion 57 may be formed so as to gradually change in the direction in which the outer wall portion 56a is erected, or may be tapered in the middle of the direction in which the outer wall portion 56a is erected.
- the plate thickness and the plate thickness on the edge side may be constant.
- the pressing portion 17 that presses the elastic portion 57 toward the inside of the choke coil housing space Sc is provided, and the pressing portion 17 presses the choke coil 15 via the elastic portion 57 .
- the pressing portion 17 always exerts an urging force on the elastic portion 57 to elastically deform the elastic portion 57 toward the inside of the choke coil housing space Sc. Therefore, even if the elastic portion 57 is deformed due to a change in atmospheric humidity or long-term use, the choke coil 15 can be kept fixed by the biasing force of the pressing portion 17 .
- the housing wall portion 56 is partially cut away. Since the choke coil 15 is fixed by the elastic portion 57 and the pressing portion 17 that biases the elastic portion 57, the choke coil 15 can be firmly fixed and the fixed state can be maintained for a long period of time. can. In addition, it is possible to suppress problems such as disconnection of the electrical connection portion (for example, soldered portion) between the choke coil 15 and the brush terminal 13 and the generation of abnormal noise due to vibration of the choke coil 15. Reliability can be improved.
- the electrical connection portion for example, soldered portion
- the choke coil 15 can be stably maintained for a long period of time without being affected by aging deterioration of the resin or deformation due to humidity. can be fixed.
- the elastic portion 17 Since the elastic portion 17 is provided between the two slits a2 formed toward the bottom surface portion 55, the other end of the elastic portion 57 is located inside the choke coil housing space Sc. In addition, it is elastically deformed toward the bottom surface portion 55 side. As a result, the choke coil 15 is pressed against the inner surfaces of the housing wall portion 56 and the bottom surface portion 55, making it difficult for the choke coil 55 to fall out of the choke coil housing space Sc. Therefore, the choke coil 15 can be fixed more reliably.
- the pressing portion 17 is provided separately from the housing wall portion 56 and the elastic portion 57, the pressing portion 17 can be realized with a component having a higher strength than the housing wall portion 56 and the elastic portion 57. Increased design freedom. Moreover, since it is a separate body, the configuration around the housing wall portion 56 and the elastic portion 57 and the configuration of the pressing portion 17 can be simplified.
- the pressing portion 17 can be inserted after the choke coil 15 is inserted into the choke coil housing space Sc, assembly can be facilitated.
- the elastic portion 57 is not biased toward the inside of the choke coil housing space Sc at the time of inserting the choke coil 15 . Therefore, the work of pushing the choke coil 15 into contact with the housing wall portion 56 and the elastic portion 57 is not required, and the choke coil 15 can be easily housed. This can also prevent the choke coil 15 from being damaged when the choke coil 15 is inserted.
- the elastic portion 57 has a thin plate thickness on the bottom surface portion 55 side (that is, the base end portion side) of the elastic portion 57, the elastic portion 57 is easily elastically deformed, and the choke coil 15 is held down more stably. can be done.
- the inner wall portion 56 b and the bottom surface portion 55 located on the opposite side of the elastic portion 57 are formed in a curved shape along the outer peripheral surface of the choke coil 15 .
- the elastic portion 57 is provided at a position facing the outer peripheral surface of the choke coil 15 on the outer wall portion 56a.
- the pressing portion 17 is provided on the brush terminal 13 .
- the brush terminal 13 that has been used conventionally, it is unnecessary to add new parts, avoiding a large design change and an increase in the number of parts, and improving fixing reliability. can be done.
- the pressing portion 17 is provided by plastically deforming the portion of the brush terminal 13 defined by the U-shaped slit a1 by bending along the folding line b connecting the ends of the U-shaped slit a1. . Therefore, the pressing portion 17 functions like a leaf spring when accommodated in the terminal accommodation space St, and can maintain an appropriate pressing force. Therefore, the choke coil 15 can be securely fixed without applying an excessive load to the elastic portion 57 and the choke coil 15 .
- the choke coil fixing structure and the motor configuration described in the above-described embodiment are merely examples, and are not limited to those described above.
- the pressing portion 17 may not be bent at the portion defined by the U-shaped slit a1 provided in the inclined portion 13a.
- the pressing portion 17 may be provided by, for example, projecting radially inwardly from a portion of the radially inner surface of the inclined portion 13a, and the inclined portion 13a is radially expanded so that the portion protrudes radially inward. It may be provided by denting from the outside in the direction toward the inside in the radial direction. Also, the pressing portion 17 may be provided on a terminal other than the brush terminal 13 .
- the pressing portion 17 may be provided on the power supply terminal 14 . Also, the terminal provided with the pressing portion 17 may not be electrically connected to the choke coil 15 pressed by the pressing portion 17 .
- the elastic portion 57 is not limited to the position described above, and may be provided at another position facing the outer peripheral surface of the choke coil 15 .
- the elastic portion 57 may be provided on the inner wall portion 56b.
- the outer wall portion 56 a facing the inner wall portion 56 b and the bottom surface portion 55 are preferably formed in a curved shape along the outer peripheral surface of the choke coil 15 .
- the elastic portion 57 may be provided on the end wall portions 56c and 56d. Also, a plurality of elastic portions 57 may be provided for one choke coil 15 .
- the elastic portion 57 may be provided on both the outer wall portion 56a and the inner wall portion 57a, or a plurality of elastic portions 57 may be provided on at least one of the outer wall portion 56a and the inner wall portion 57a.
- the pressing portions may be provided according to the number of elastic portions. When each wall is provided with a plurality of elastic portions, a pressing portion that biases the plurality of elastic portions may be provided as a single member.
- the shape of the third mounting portion 53 is not limited to that described above.
- the housing wall portion 56 of the third mounting portion 53 is not limited to a substantially rectangular shape when viewed in the axial direction, and may be an elliptical shape elongated in the direction of the axis Lc of the choke coil 15, for example.
- the bottom surface portion 55 and the side wall portions 56a and 56b do not have to be smoothly curved and connected.
- the shapes of the first mounting portion 51 and the second mounting portion 52 are not limited to those described above.
- the elastic portion 57 may have a configuration in which the end portion protrudes radially inward instead of the configuration in which the base end portion is recessed radially outward.
- the surface of the elastic portion 57 on the side of the choke coil housing space Sc may be curved along the outer peripheral surface of the choke coil 15 . In this case, since the elastic portion 57 is in closer contact with the choke coil 15, the choke coil 15 can be fixed more firmly.
- the thickness of the elastic portion 57 may be uniform in the erecting direction of the housing wall portion 56 .
- the pressing portion may be provided as a separate member from the terminals (brush terminal 13 and power supply terminal 14).
- the pressing portion may be configured by a triangular wedge-shaped member or a screw-shaped member with a widened tip.
- the second space accommodating the pressing portion may be provided separately from the third space accommodating the terminal.
- the pressing part is not limited to being made of metal, and may be made of other materials.
- the pressing portion may be made of hard rubber.
- the pressing portion is made of another material, it is preferable that the pressing portion is made of a material having a higher strength than the containing wall portion and the elastic portion.
- the pressing portion may be made of resin. In this case, it may be made of the same resin material as that of the accommodation wall and the elastic portion, or may be made of a resin material having higher strength and hardness than those of the accommodation wall and the elastic portion.
- the pressing portion may be formed integrally with the housing wall portion and the elastic portion. That is, the pressing portion may be provided as part of the end bell 5 .
- the pressing portion is configured to bias the elastic portion toward the inside of the first space (the space corresponding to the choke coil housing space Sc) by bending a portion of the end bell 5 after molding the end bell 5.
- the pressing portion may be configured by thermally deforming a portion of the end bell 5 so as to urge the elastic portion toward the inside of the first space.
- the shape of the notch (slit a2) provided in the outer wall portion 56a is not limited to that described above.
- the notch provided in the outer wall portion 56a may be L-shaped. That is, the elastic portion is formed by a notch having a portion extending in the erecting direction of the outer wall portion 56a and a portion bent from this portion and extending parallel to the axis Lc direction of the choke coil 15. may In this case, the choke coil 15 is pressed against the inner surface of the inner wall portion 56b.
- the choke coil 15 may be arranged so that its axis Lc direction is parallel to the axial direction of the motor 1 .
- the shape of the end bell 5 is not limited to a tubular shape.
- the end bell 5 may be a lid-like member that closes the opening 31 a of the auxiliary yoke 31 .
- the fixing structure described above may be provided at a location where the choke coil is accommodated, and may be provided at a component other than the end bell 5 .
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Motor Or Generator Current Collectors (AREA)
Abstract
Description
(3)チョークコイルの固定構造は、前記収容壁部の一部を挟んで前記第一空間と隣接して設けられ、前記押圧部を収容する第二空間を備えることが好ましい。この場合、前記押圧部は、前記収容壁部及び前記弾性部の双方と別体で設けられ、前記弾性部は、前記収容壁部のうち前記第一空間と前記第二空間との間に立設する前記収容壁部の一部の縁部から前記底面部側に向かって形成された二本のスリットの間に設けられることが好ましい。
(5)前記収容壁部は、前記チョークコイルが前記第一空間に収容された収容状態で、前記チョークコイルの軸線方向に延在する一対の側面部を有することが好ましい。この場合、前記弾性部は、前記チョークコイルの前記収容状態で、一方の前記側面部における前記チョークコイルの外周面に対向する位置に設けられ、前記底面部及び他方の前記側面部は、前記チョークコイルの前記外周面に沿う曲面状に形成され、前記押圧部は、前記弾性部を介して前記チョークコイルを前記他方の側面部の内面及び前記底面部との間で固定することが好ましい。
図1は、本実施形態のモータ1の軸方向半断面図である。本実施形態のモータ1は、永久磁石界磁式のブラシ付き直流モータであり、ステータ3と、ロータ4と、エンドベル5と、エンドプレート6とを有する。筒状のステータ3には、ロータ4が配置される。すなわち、モータ1は、いわゆるインナーロータ型モータである。ロータ4は、シャフト41を備えており、シャフト41の中心線Lr回りに回転する。なお、シャフト41の中心線Lrはモータ1(ロータ2)の中心線でもある。以下、中心線Lrが延びる方向を軸方向といい、中心線Lrに直交する方向を径方向といい、中心線Lr回りに周回する方向を周方向という。
図6は、図2のエンドベル5の斜視図である。図6では、ブラシターミナル13及び後述する押圧部17の構造を視認しやすくする観点から、一対のブラシ11の一方(紙面下側のブラシ11)とこれに接続されるブラシアーム12及びブラシターミナル13とが部分的に他側に引き抜かれた状態(配置完了前の状態)を示している。
(1)上述したチョークコイル15の固定構造及びこの固定構造が適用されたモータ1では、チョークコイル15の固定に際し、接着剤を使用せずに機械的に固定するので、生産工程において接着剤の糸引きによる不良や塗布位置の不良をなくすことができ、不良率を低減できる。さらに、モータ1の原価削減、接着剤の乾燥までの待機時間削減、接着剤塗布状態の検査費用削減を図ることができる。
上述の実施形態で説明したチョークコイルの固定構造及びモータの構成は一例であって、上述したものに限られない。押圧部17は、傾斜部13aに設けられたU字スリットa1により区画された部分が屈曲形成されたものでなくてもよい。押圧部17は、例えば、傾斜部13aの径方向内側の面の一部を径方向内側に突出させることで設けられてもよく、当該部分が径方向内側に突出するように傾斜部13aを径方向外側から径方向内側に向けて凹ませることで設けられてもよい。また、押圧部17がブラシターミナル13以外の端子に設けられていてもよい。例えば、チョークコイル15が給電ターミナル14に隣接して設けられる場合には、押圧部17は給電ターミナル14に設けられてもよい。また、押圧部17が設けられる端子は、押圧部17が押圧するチョークコイル15と電気的に接続されるものでなくてもよい。
3 ステータ
4 ロータ
11 ブラシ
13 ブラシターミナル(端子)
14 給電ターミナル(端子)
15 チョークコイル
16 フェライトコア
17 押圧部
44 整流子
55 底面部
56 収容壁部
56a 外側壁部(側面部)
56b 内側壁部(側面部)
57 弾性部
a1 U字スリット
a2 スリット
b 折線
Lc 軸線
Sc チョークコイル収容空間(第一空間)
Sp 押圧部収容空間(第二空間)
St 端子収容空間(第三空間)
Claims (8)
- 整流子に摺接するブラシと電気的に接続されるとともに内部にフェライトコアが収容されるチョークコイルの固定構造であって、
前記チョークコイルが載置される底面部と、
前記底面部から立設されて、前記底面部とともに前記チョークコイルを収容する第一空間を形成する収容壁部と、
前記収容壁部の一部を切り欠いて形成された弾性変形可能な弾性部と、
前記弾性部を前記第一空間の内側へ付勢することで前記弾性部を介して前記チョークコイルを押圧し、前記チョークコイルを前記収容壁部の内面との間で固定する押圧部と、を備えた
ことを特徴とする、チョークコイルの固定構造。 - 前記収容壁部及び前記弾性部は樹脂製であり、
前記押圧部は金属製である
ことを特徴とする、請求項1記載のチョークコイルの固定構造。 - 前記収容壁部の一部を挟んで前記第一空間と隣接して設けられ、前記押圧部を収容する第二空間を備え、
前記押圧部は、前記収容壁部及び前記弾性部の双方と別体で設けられ、
前記弾性部は、前記収容壁部のうち前記第一空間と前記第二空間との間に立設する前記収容壁部の一部の縁部から前記底面部側に向かって形成された二本のスリットの間に設けられる
ことを特徴とする、請求項1又は2に記載のチョークコイルの固定構造。 - 前記弾性部は、前記底面部側の板厚が前記縁部側の板厚よりも薄い
ことを特徴とする、請求項3記載のチョークコイルの固定構造。 - 前記収容壁部は、前記チョークコイルが前記第一空間に収容された収容状態で、前記チョークコイルの軸線方向に延在する一対の側面部を有し、
前記弾性部は、前記チョークコイルの前記収容状態で、一方の前記側面部における前記チョークコイルの外周面に対向する位置に設けられ、
前記底面部及び他方の前記側面部は、前記チョークコイルの前記外周面に沿う曲面状に形成され、
前記押圧部は、前記弾性部を介して前記チョークコイルを前記他方の側面部の内面及び前記底面部との間で固定する
ことを特徴とする、請求項3又は4に記載のチョークコイルの固定構造。 - 前記第一空間とは離隔した位置に設けられた第三空間に収容される金属製の端子を備え、
前記押圧部は、前記端子が前記第三空間に収容された状態で、前記端子における前記収容壁部の一部に対向する位置に設けられる
ことを特徴とする、請求項1~5のいずれか1項に記載のチョークコイルの固定構造。 - 前記端子には、前記端子が前記第三空間に収容された状態で、前記底面部側に向かって開口するU字状のU字スリットが設けられており、
前記押圧部は、前記U字スリットにより区画された部分が前記U字スリットの端部同士を繋ぐ折線で屈曲形成されて塑性変形することで設けられた
ことを特徴とする、請求項6に記載のチョークコイルの固定構造。 - ステータおよびロータを具備したモータにおいて、
前記ロータと一体回転する整流子に摺接するブラシと、
前記ブラシと電気的に接続されるチョークコイルと、を備え、
前記チョークコイルに対し、請求項1~7のいずれか1項に記載のチョークコイルの固定構造が適用された
ことを特徴とする、モータ。
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CN202280037414.4A CN117378131A (zh) | 2021-07-29 | 2022-06-03 | 扼流圈的固定结构以及马达 |
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Citations (4)
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DE10010439A1 (de) * | 2000-03-03 | 2001-09-13 | Bosch Gmbh Robert | Stellantrieb bzw. Verfahren zur Montage eines Stellantriebs |
JP2011035976A (ja) * | 2009-07-30 | 2011-02-17 | Mitsuba Corp | 電動モータ |
CN201893391U (zh) * | 2010-06-21 | 2011-07-06 | 番禺得意精密电子工业有限公司 | 电池座装置 |
JP2020114098A (ja) * | 2019-01-11 | 2020-07-27 | 株式会社デンソー | チョークコイル、及びブラシホルダ装置 |
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- 2022-06-03 DE DE112022001070.3T patent/DE112022001070T5/de active Pending
- 2022-06-03 JP JP2023538312A patent/JPWO2023007949A1/ja active Pending
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Publication number | Priority date | Publication date | Assignee | Title |
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DE10010439A1 (de) * | 2000-03-03 | 2001-09-13 | Bosch Gmbh Robert | Stellantrieb bzw. Verfahren zur Montage eines Stellantriebs |
JP2011035976A (ja) * | 2009-07-30 | 2011-02-17 | Mitsuba Corp | 電動モータ |
CN201893391U (zh) * | 2010-06-21 | 2011-07-06 | 番禺得意精密电子工业有限公司 | 电池座装置 |
JP2020114098A (ja) * | 2019-01-11 | 2020-07-27 | 株式会社デンソー | チョークコイル、及びブラシホルダ装置 |
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