CN114270668A

CN114270668A - Electric motor

Info

Publication number: CN114270668A
Application number: CN202080058607.9A
Authority: CN
Inventors: 盐谷康仁
Original assignee: Panasonic Intellectual Property Management Co Ltd
Current assignee: Panasonic Intellectual Property Management Co Ltd
Priority date: 2019-11-29
Filing date: 2020-11-17
Publication date: 2022-04-01
Also published as: WO2021106675A1; JP7352785B2; JPWO2021106675A1

Abstract

The motor includes: an iron core (2) formed in a ring shape; a winding (4) wound around the core (2); an insulating member (3) for insulating the iron core (2) from the winding (4); and a circuit board group (8) having lead wires (10) and lead wire fixing members (12). Provided are a stator, an electrode, and an air blowing device, wherein an insulator (3) has a stator engaging portion (13) that engages with a lead wire stator (12) protruding to the outer peripheral side of a ring shape, and the lead wire stator (12) has a tapered engaging portion (40) that engages with the stator engaging portion (13) of the insulator (3).

Description

Electric motor

Technical Field

The present invention relates to an electric motor.

Background

At present, there is known an electric motor including: a stator composed of a winding and an outgoing line led out from the winding; a housing for accommodating the stator; an outgoing line insertion hole provided in the housing; and an outgoing line fixing member disposed in a gap between the insertion hole and the outgoing line.

Next, the structure thereof will be described with reference to fig. 12.

As shown in fig. 12, the stator 111 includes a core 112, a winding 113, lead wires 114 drawn out from the winding, a lead wire fixing member 115 through which the lead wires are inserted, and a relay connector 116 mounted on a terminal.

The housing 117 has a lead wire fixing piece insertion hole 118 to which the lead wire fixing piece 115 is engaged.

When stator 111 is housed in case 117, lead wires 114 connected to relay connector 116 are inserted into lead wire fixture insertion holes 118, and lead wire fixture 115 is engaged with lead wire fixture insertion holes 118, whereby the tightness of the case interior can be improved, and improvement in resistance to dust and moisture is expected.

Documents of the prior art

Patent document

Patent document 1: japanese Kokai publication Sho 63-93752

Disclosure of Invention

In such a conventional configuration in which the lead wire fixing member and the housing are provided with the insertion hole, when the relay component such as the connector is mounted on the lead wire tip, if the relay component is larger than the insertion hole, the lead wire needs to be inserted first and then the relay component needs to be mounted.

In addition, in this configuration, it is difficult to uniquely identify the position of the lead wire fixing member through which the lead wire is inserted on the lead wire, and the insertion hole is also provided on the housing side.

Therefore, an object of the present invention is to provide a motor in which, when a stator is housed in a case, the durability against dust and moisture can be maintained regardless of the specification of the leading end of a lead wire, and automation of assembly can be expected.

In order to achieve the above object, the present invention provides a motor including: a stator; a circuit board disposed on one end side in an axial direction of the stator; lead-out wires led out from the circuit board; a bottomed cylindrical case that holds the stator in an internal space from the one end side; a notch portion provided from the top surface opening toward the bottom surface on the side surface of the housing; and a lead wire fixing member that holds the lead wire and fixes the lead wire to the notch portion. By adopting such a structure, a desired object is achieved.

According to the present invention, when the stator is housed in the case, the durability (durability) against dust and moisture can be maintained regardless of the specification of the leading end of the lead wire, and automation of assembly can be expected.

Drawings

Fig. 1 is an exploded perspective view of a motor according to embodiment 1 of the present invention.

Fig. 2 is a plan view of a stator according to embodiment 1 of the present invention.

Fig. 3 is a partial perspective view of an insulator according to embodiment 1 of the present invention.

Fig. 4 is a plan view of the insulating member and the circuit board according to embodiment 1 of the present invention.

Fig. 5 is a perspective view of an outlet fixing member according to embodiment 1 of the present invention.

Fig. 6 is a side sectional view of the lead wire fixing member according to embodiment 1 of the present invention.

Fig. 7 is a bottom view of the lead wire fixing member according to embodiment 1 of the present invention.

Fig. 8 is a perspective view of the circuit board group and the lead wire fixing member in an engaged state according to embodiment 1 of the present invention.

Fig. 9 is an exploded perspective view of a circuit board and a lead wire fixing member according to embodiment 1 of the present invention.

Fig. 10 is an exploded perspective view of a motor according to embodiment 1 of the present invention.

Fig. 11 is a side sectional view of an outlet fixing member according to embodiment 2 of the present invention.

Fig. 12 is a simplified diagram showing a state of a conventional winding.

Detailed Description

Embodiments of the present invention will be described below with reference to the drawings. The following embodiments are merely examples embodying the present invention, and do not limit the technical scope of the present invention. In all the drawings, the same parts are denoted by the same reference numerals, and the description thereof will be omitted for a plurality of times (second or more). In the drawings, the detailed description of the parts not directly related to the present invention is simplified or omitted.

(embodiment mode 1)

A first embodiment of the present invention will be described with reference to the drawings.

First, the motor 6 of the present embodiment will be described with reference to fig. 1. Fig. 1 is an exploded perspective view of the motor 6 with the rotor removed for ease of understanding and explanation. The motor 6 includes a stator 1,

housings

16a and 16b, and a rotor not shown.

The stator 1 has a hollow cylindrical shape, and a rotor is disposed in the hollow space. The stator 1 functions as a motor by rotating a rotor by energization and rotationally driving a rotary shaft provided in the rotor and extending from the housing 16b to the outside. The detailed structure of the stator 1 will be described later.

The inner diameter of the housing 16a is substantially the same as the outer diameter of the core 2 provided in the stator 1. The case 16a has a bottomed cylindrical shape holding the stator 1 in the internal space, and has a U-shaped cutout 17 on a side surface of the case, the cutout 17 being provided on the side surface of the case from the top surface opening of the case 16a toward the bottom surface and opening on the top surface opening, and being engaged with a lead wire fixing member 12 (see fig. 2) described later.

The case 16b is a bottomed cylindrical shape holding the stator 1 in the internal space, has an inner diameter substantially equal to the outer diameter of the core 2, and is fitted concentrically with the stator 1 and the case 16 a. The housing 16b is different from the housing 16a in that it does not have the notch 17 and has a through hole through which the rotation shaft passes in the center of the bottom surface, and otherwise has substantially the same shape as the housing 16 a. However, a through hole may be formed on the housing 16a side.

Both the housing 16a and the housing 16b have a flange 34 provided to extend from the top surface opening to the outer periphery.

The flange 34 is provided over the entire circumference of the case 16a except for the notch 17. The flange 34 is provided over the entire circumference of the housing 16 b. The flange 34 has through holes 41 common to the case 16a and the case 16b, and the through holes 41 are aligned with each other to form a closed case.

Next, the structure of the stator 1 will be described with reference to fig. 2. Fig. 2 is a plan view of the stator 1.

The stator 1 includes a stator core, i.e., a core 2, an insulator 3, a winding 4, a terminal connecting portion 5, and a circuit board group 8.

The core 2 is integrally formed with a yoke portion 7 and a tooth portion (not shown) protruding from the yoke portion 7 toward the inner peripheral side, and the core 2 is integrally formed in a ring shape or formed in a ring shape by a plurality of divided cores.

The insulator 3 is configured to cover the core 2, and a lead wire made of copper or an alloy of aluminum as a main material of the winding 4 is wound around the plurality of teeth via the insulator 3, thereby serving to electrically insulate the core 2 from the winding 4. The insulator 3 has a ring shape corresponding to the divided cores, similarly to the cores 2. The insulator 3 includes a T-shaped fixture engaging portion 13 protruding toward the outer periphery and a circuit board positioning protrusion 14 (protrusion 14a, protrusion 14b) (see fig. 3), and the tapered engaging portion 40 included in the lead wire fixture 12 is engageable with the fixture engaging portion 13. The insulator 3 will be described in detail later.

The winding 4 is a wire wound around the core 2 including the insulator 3, and the winding specifications are different depending on the required specifications.

The terminal connecting portion 5 is a conductive pin provided in parallel with the rotation axis and provided upright on the insulator 3. The terminal connecting portion 5 is connected to an end portion of the winding 4 wound around the core 2 and is connected to an electrical contact of the circuit board 9, thereby electrically connecting the winding 4 to the lead wire 10.

The circuit board group 8 includes a circuit board 9, lead wires 10 connected to the circuit board 9, and lead wire fixing members 12 through which the lead wires 10 are inserted, and details thereof will be described later.

The circuit board 9 connects a plurality of electrical contacts to connect an external circuit such as an inverter circuit to the winding 4. The circuit board 9 has a partial doughnut (doughmut) shape, which is a shape in which a part of a hollow circular shape having a center angle of about 160 degrees is the outline thereof (the shape of the circuit board 9 is a shape in which a part of a hollow circular shape having a center angle of about 160 degrees is the outline of the circuit board 9). The circuit board 9 is concentric with the central axis 19 of the core 2, and the circuit board 9 is disposed at a position apart from the central axis 19 by a predetermined distance in the direction of the core 2 on a plane perpendicular to the central axis 19. The circuit board 9 is mounted on and fixed to the outer periphery of the top surface, which is the end on the top surface of the insulator 3, and the lead wire 10 is connected to the top surface of the circuit board 9, which is the surface opposite to the core 2. The circuit board 9 has a notch 15a and a notch 15b shown in fig. 4 for locking with the insulator 3, and details thereof will be described later.

The lead wire 10 is composed of a plurality of wires whose conductive wires are covered with an insulating cover, and in order to supply input power to the circuit board 9, the tip of the lead wire 10 is connected to an electrical contact of the circuit board 9 according to the circuit board design. The number and diameter of the lead wires 10 are different depending on the specification of the motor, and the protective tube 11 for protecting the lead wires and the insulating coating constituting the lead wires 10 can be appropriately selected depending on the required specification.

As shown in a perspective view in fig. 5 and a side sectional view in fig. 6, the lead wire fixing member 12 includes a covering (ラップ: lap) portion 33, an inner peripheral portion 31, an outer peripheral portion 29, a connecting portion 30, an insertion hole 27, a tapered engaging portion 40, and a groove. The covering portion 33 faces the outer periphery of the core 2. The inner peripheral portion 31 is located on the inner peripheral surface of the housing 16. The outer peripheral portion 29 is located on the outer peripheral surface of the housing 16. The connecting portion 30 connects the inner peripheral portion 31 and the outer peripheral portion 29. The insertion hole 27 is through which the lead wire 10 and the protection tube 11 are inserted. The tapered engaging portion 40 engages with the anchor engaging portion 13 of the insulator 3. The groove is formed by a connecting portion 30 connecting an inner circumferential portion 31 and an outer circumferential portion 29, which will be described later, and engages with the notch 17 of the housing 16 a. Details will be described later.

Next, the insulator 3 will be described in detail with reference to fig. 3. Fig. 3 is a partial perspective view of the insulating member 3.

The insulator 3 has a fastener engagement portion 13 on the top surface (or bottom surface) of the insulator 3, which is a plane perpendicular to the central axis 19 in the vicinity of the end portion of the insulator 3 in the axial direction. The insulator 3 has a hollow doughnut shape on the top surface and the bottom surface, and has an outer diameter side expanded portion end surface 24 axially further expanded from the top surface at the outer peripheral side end portion of the doughnut shape, and an inner diameter side expanded portion end surface 25 axially further expanded from the top surface at the inner peripheral side end portion.

The stator engaging portion 13 bulges in the direction of the yoke portion 7 on the outer peripheral side from the insulator outer diameter portion 20, which is the outermost periphery of the ring shape of the insulator 3. The stator engaging portion 13 has a T-shape in a plan view, a head portion of the T-shape is located on the outer peripheral side of the stator engaging portion 13 as a stopper portion 21, and a leg portion of the T-shape is connected to the insulator outer diameter portion 20 as a root portion 22 and protrudes from the insulator 3 to the outer peripheral side. The stopper portions 21 project from the outer peripheral end of the root portion 22 toward both sides of the ring shape of the core 2 (i.e., the tangential direction of the ring-shaped core 2). The stopper portion 21 and the root portion 22 form a tapered structure of the fastener engagement portion 13 by the protrusion of the stopper portion 21. The root portion 22 is preferably configured to have a width in the tangential direction smaller than the diameter of the lead wire 10. The fixture engaging portion 13 has a wiring plane portion 23, and the wiring plane portion 23 has a thickness sufficient in strength in the axial direction of the insulator 3 and is in contact with the lead wire 10.

The protrusion 14a protrudes in the axial direction on the outer diameter side expanded portion end surface 24 on the inner circumference side of the anchor engagement portion 13, and the protrusion 14b protrudes in the axial direction on the inner diameter side expanded portion end surface 25 on the inner diameter side of the circuit board 9 on which the top surface is disposed. The protrusions 14 (

protrusions

14a and 14b) hold the circuit board 9 and stabilize the position of the circuit board 9 in the radial direction and the circumferential direction when the circuit board 9 is disposed on the insulator 3. In the present embodiment, as an example, the projecting portions 14a are arranged on the outer diameter side expanded portion end surface 24 with a width (interval) wider than the root portion 22 in the circumferential direction of the fastener engaging portion 13. The protrusions 14b are formed on the inner diameter side expanded portion end surface 25 at positions spaced 45 ° apart from the root portion 22 toward both sides in the circumferential direction.

Next, the details of the structure of the circuit board 9 and the insulating member 3 will be described with reference to fig. 4. Fig. 4 is a plan view of the circuit board 9 and the insulating member 3.

The circuit board 9 has a notch 15a and a notch 15b, which are notches 15 recessed from the inner and outer diameters of the partial doughnut shape toward the inner direction of the circuit board 9. The position and size of each notch 15 correspond to the projection 14a and the projection 14b of the insulator 3, depending on the purpose. That is, when the circuit board 9 is mounted, the

notches

15a and 15b of the circuit board 9 are engaged with the

protrusions

14a and 14b of the insulator 3, respectively, to thereby determine the radial and circumferential positions. The axial position is determined by the contact of the circuit board 9 with the outer diameter side expanded portion end surface 24 and the inner diameter side expanded portion end surface 25. In this state, the fastener engagement portion 13 protrudes to a position closer to the outer periphery than the outer periphery of the circuit board 9.

The circuit board 9 has a bulging portion 26 in the vicinity of the notch 15, and the bulging portion 26 is engaged with a circuit board holding rib 37 (see fig. 5 and 6) of the lead wire fixing member 12.

The bulge portion 26 forms a notch 15 by projecting in the outer circumferential direction in the vicinity of the outer circumference of the circuit board 9. The bulge portion 26 has a side a48 and a side B49 on both sides in the circumferential direction. Side a48 and side B49 are not parallel and are arranged to be wider at the outside and narrower at the inside (i.e., spread outward) when viewing bulge 26 from above. That is, the bulging portion 26 has a substantially trapezoidal shape having an upper bottom on the inner circumferential side and a lower bottom on the outer circumferential side in plan view. This can strongly suppress the movement of the circuit board 9 in the radial direction when engaging with the lead wire fixing member 12, and has strong resistance against the extraction of the lead wire 10.

Next, details of the lead wire fixing member 12 will be described with reference to fig. 5, 6, and 7. Fig. 5 is a perspective view of the lead wire fixing member 12, fig. 6 is a sectional view a-a of the lead wire fixing member 12 of fig. 5, and fig. 7 is a bottom view of the lead wire fixing member 12 (fig. 6).

The lead wire fixing member 12 has an insertion portion 43 through which the lead wire 10 is inserted and a tapered engagement portion 40 for engaging with the circuit board 9 and the insulator 3.

The insertion portion 43 is a hole that penetrates from the inner circumferential end to the outer circumferential end of the lead wire fixing member 12. The insertion portion 43 has a hollow cylindrical shape, and the lead wire 10 is inserted into an inner space of the insertion portion 43. The insertion portion 43 is constituted by the insertion hole 27 and the insertion hole extension portion 44.

The insertion hole 27 has an outer peripheral portion 29, an inner peripheral portion 31, and a connecting portion 30. In other words, the range of the insertion portion 43 from the outer peripheral portion 29 to the inner peripheral portion 31 through the connection portion 30 corresponds to the insertion hole 27.

The outer peripheral portion 29 further protrudes from the outer peripheral surface of the insertion hole 27 toward the outer periphery. The outer peripheral portion 29 has a plate-like dome shape in the thickness direction, and the insertion hole 27 penetrates through the vicinity of a curved portion (curved portion) of the dome shape. The arch shape is larger than the U-shaped cutout 17 provided in the case 16a by one turn, that is, the entire cutout 17 can be covered. The outer peripheral portion 29 has a covering portion 33 and a flange contact surface 35.

The covering portion 33 corresponds to a lower rectangular portion of an arch shape, and when the lead wire fixing member 12 is fitted into the cutout portion 17, the covering portion 33 is provided to extend in the same circular shape as the core 2, that is, to be aligned with the core 2 in the radial direction. In other words, the inner peripheral surface of the covering portion 33 faces the core 2, and when the housing 16a and the housing 16b are engaged with each other, the inner peripheral surface faces the housing 16 b.

The flange contact surface 35 is a bottom surface of a lower rectangular portion of an arch shape, and when the housing 16a is engaged with the housing 16b, the flange contact surface 35 faces the flange 34 of the housing 16 b. In other words, the flange contact surface 35 is located on the same surface as the top surface opening of the housing 16 b.

The inner peripheral portion 31 is provided on the inner peripheral side of the outer peripheral portion 29 in the extending direction of the insertion hole 27 with the connecting portion 30 interposed therebetween. The inner peripheral portion 31 further protrudes from the outer peripheral surface of the insertion hole 27 to the outer periphery at the end of the insertion hole 27 opposite to the narrow portion 28. The inner peripheral portion 31 has a plate shape, and the insertion hole 27 penetrates through the inner peripheral portion 31 in the vicinity of the center thereof. In other words, the insertion hole 27 penetrates the outer peripheral portion 29 and the inner peripheral portion 31. The height of the inner circumferential portion 31 in the axial direction on the housing 16a side is higher than the height of the outer circumferential portion 29 in the axial direction on the housing 16a side. The inner peripheral portion 31 has a core contact surface 36 and a circuit board holding rib 37.

The core contact surface 36 is provided in parallel with the flange contact surface 35 at a position closer to the insertion hole 27 than the flange contact surface 35 of the inner peripheral portion 31. When the housing 16a and the housing 16b are engaged, the core contact surface 36 faces the yoke portion of the core 2, i.e., covers the core 2.

The circuit board holding rib 37 is provided at a position opposite to the core contact surface 36 of the inner peripheral portion 31 via the insertion hole 27. The circuit board holding rib 37 protrudes further toward the central axis 19 from the end portion of the insertion hole 27 opposite to the narrowed portion 28, and engages with the circuit board 9 to stabilize the positional relationship between the lead wire and the circuit board 9. The circuit board retention ribs 37 have wedge-shaped slots 38 and circuit board contact faces 39.

The wedge-shaped groove 38 has a wedge shape that engages with the bulging portion 26 of the circuit board 9. That is, the bulge portion 26 is engaged with the male side (male side) and the wedge groove 38 is engaged with the female side (female side). As shown in fig. 7, the wedge-shaped groove 38 is a groove formed by digging inward from below the circuit board holding rib 37 toward the upper side, and the expanded portion 26 is engaged with the wedge-shaped groove 38 by fitting the lead wire fixing member 12 from above the circuit board 9.

The circuit board contact surfaces 39 form the bottom surfaces of the wedge-shaped grooves 38. That is, the circuit board holding rib 37 is fixed to the circuit board 9 by bringing the circuit board contact surface 39 into contact with the bulging portion 26 in a state where the bulging portion 26 is fitted into the wedge-shaped groove 38.

The connecting portion 30 connects the outer peripheral portion 29 and the inner peripheral portion 31 so that the outer peripheral portion 29 and the inner peripheral portion 31 are spaced apart by a predetermined interval (gap). That is, the connection portion 30 is a part of the outer peripheral surface of the insertion hole 27, and ranges from the outer peripheral end of the outer peripheral portion 29 to the inner peripheral end of the inner peripheral portion 31. The periphery of the U-shaped notch 17 is located in the gap formed by the connecting portion 30. That is, the side surface of the housing 16a having the notch 17 is sandwiched between the inner peripheral surface of the outer peripheral portion 29 (except the covering portion 33) and the outer peripheral surface of the inner peripheral portion 31.

The insertion hole extension 44 is provided to rise from the outer peripheral portion 29, which is one end of the outer peripheral side of the insertion hole 27, in the outer peripheral direction, and constitutes a part of the insertion portion 43. The insertion hole extension 44 extends the insertion hole 27 in the outer circumferential direction. The insertion hole extension portion 44 has a narrowed portion 28 formed at an outer circumferential end portion with an inner diameter smaller than that of an inner circumferential portion. That is, the narrowed portion 28 is formed to narrow the opening area of the insertion hole 27 by bending and extending the wall surface in the inner circumferential direction at the distal end in the extending direction of the insertion hole 27, that is, the distal end of the insertion hole extending portion 44. The insertion hole extension portion 44 has a thick portion 32 whose thickness from the inner peripheral surface to the outer peripheral surface is thicker than that of the surrounding portion in a cross section perpendicular to the extension direction. Here, the peripheral portion is a portion of the wall surface forming the insertion hole 27, which is thinner than the thick portion 32.

The lead wire fixing member 12 has a tapered engagement portion 40.

The tapered engaging portion 40 is formed by the outer peripheral portion 29, the inner peripheral portion 31, and the connecting portion 30, and engages with the anchor engaging portion 13 formed in the insulator 3. Specifically, as shown in fig. 6 and 7, the tapered engagement portion 40 is a space in the radial direction between a surface of the inner peripheral surface of the outer peripheral portion 29 on the insertion hole extension portion 44 side with respect to the covering portion 33 and the outer peripheral surface of the inner peripheral portion 31. The tapered engagement portion 40 is a space sandwiched by both circumferential ends of the connection portion 30 in the circumferential direction. The lead wire fixing member 12 is fixed to the insulator 3 by inserting the fixing member engaging portion 13 shown in fig. 3 and 4 from below toward above into the tapered engaging portion 40 and housing the fixing member engaging portion 13. That is, the lead wire fixing member 12 is firmly fixed to the circuit board 9 and the insulator 3 by the tapered engaging portion 40 and the wedge-shaped groove 38.

Next, referring to fig. 8, 9, and 10, the circuit board 9, the lead wire 10, the protective tube 11, and the lead wire fixing member 12 constituting the circuit board group 8 will be described. Fig. 8 is a bottom perspective view (bottom perspective view) and a top perspective view (top perspective view) of the circuit board group 8, fig. 9 is an exploded view of the circuit board 9 and the lead wire fixing members 12, and fig. 10 is an exploded perspective view in which only the housing 16a is not mounted on the motor 6.

The lead wire 10 is composed of a plurality of lead wires 45, an insulating coating 46 covering each of the plurality of lead wires, and a protective tube 11 that binds and protects the plurality of insulating coatings 46.

The protective tube 11 is inserted through the insertion hole 27 of the lead wire fixing member 12, and the lead wire terminals are connected to the respective electrical contacts of the circuit board 9.

The circuit board 9 is engaged with the circuit board holding rib 37 of the lead wire fixing member 12 at the bulging portion 26. That is, by fitting the circuit board 9 into the lead wire fixing member 12 in the direction indicated by the broken-line arrow 47 shown in fig. 9, the wedge-shaped groove 38 and the circuit board contact surface 39 of the circuit board holding rib 37 of the lead wire fixing member 12 are engaged with the bulging portion 26 of the circuit board 9, and the circuit board 9 is held. The wedge-shaped groove 38 of the lead wire fixing member 12 is formed similarly in view of the purpose of gripping the bulging portion 26 of the circuit board 9, and the position of the circuit board 9 can be stabilized in the radial direction and the circumferential direction by the wedge shape.

As shown in fig. 10, the stator 1 is fitted to a housing 16b having an inner peripheral diameter substantially the same as the outer diameter of the core 2 of the stator 1 at a predetermined depth. At this time, the taper engaging portion 40 of the lead wire fixing member 12 included in the circuit board group 8 is engaged with the fixing member engaging portion 13 included in the insulator 3, and the yoke portion 7 of the core 2 faces the core contact surface 36 included in the lead wire fixing member 12 in the axial direction. Further, the lead wire fixing member 12 has a flange contact surface 35 facing the flange 34 of the housing 16 b.

In the above configuration, the mounting position of the lead wire fixing members 12 of the circuit board group 8 is determined by the bulging portions 26 of the circuit board 9 shown in fig. 4 and the wedge-shaped grooves 38 and the circuit board contact surfaces 39 of the circuit board holding ribs 37 of the lead wire fixing members 12 shown in fig. 5 to 7. The mounting position of the circuit board group 8 in the stator 1 is determined by the tapered engaging portion 40 of the lead wire fixing member 12 shown in fig. 6 to 7 and the T-shaped fixing member engaging portion 13 of the insulating member 3 shown in fig. 3 to 4. The positions of the circuit board group 8 with respect to the insulator 3 in the circumferential direction and the radial direction are determined by the projection 14 of the insulator 3, the notch 15 of the circuit board 9, and the tapered engagement portion 40 shown in fig. 4.

The axial placement height of the circuit board group 8 is determined by the outer diameter side expanded portion end surface 24 and the inner diameter side expanded portion end surface 25 of the insulator 3 shown in fig. 3.

The placement of the housing 16a of the electric motor 6 can be easily assembled by engaging the groove formed by the connection portion 30 of the lead wire fixing member 12 with the notch 17 of the housing 16 a. When the housing 16a and the housing 16b are engaged and pressed, the circuit board 9 is sandwiched between the outer diameter side bulging portion end surface 24 shown in fig. 3 and the circuit board contact surface 39 of the lead wire fixing member 12, and the axial direction is highly stabilized.

Further, the outer peripheral portion 29 and the inner peripheral portion 31 of the lead wire fixing member 12 have axial heights on the side of the housing 16a that are different in height from each other. This difference in height can absorb the displacement of the case 16a from the lead wire fixing member 12 when the case 16a is assembled to the stator 1, and can be expected to facilitate the assembly automation. That is, the case 16a is moved slightly closer to the outer peripheral portion 29 side (i.e., lower side) of the lead wire fixing member 12, and then the case 16a is moved to the inner peripheral portion 31 side at a predetermined height. This allows the inner peripheral side surface of the case 16a to abut against the outer peripheral surface of the inner peripheral portion 31, thereby correcting misalignment. In this state, by assembling the housing 16a and the housing 16b, the notch 17 can be accurately inserted into the connection portion 30 having a narrow gap. In the present embodiment, the height of the outer peripheral portion 29 is set to be lower than the height of the inner peripheral portion 31, but even if the configuration is reversed, the same effect can be obtained. That is, the height (position in the height direction) may be different.

When the housing 16a and the housing 16b are engaged and pressed, as shown in the shape of fig. 7, the lead wire fixing member 12 is sandwiched from the inside to the outside in the circumferential direction by the fixing member engaging portion 13 inserted into the tapered engaging portion 40, and the lead wire fixing member 12 is sandwiched from the outside to the inside in the circumferential direction by the notch portion 17 narrowed by the connecting portion 30. That is, the lead wire fixing member 12 and the housing 16a are tightly engaged with each other, and the resistance to dust and moisture can be improved.

Further, since the core contact surface 36 faces the yoke portion of the core 2, that is, covers the core 2, even if dust or the like passing through between the outer peripheral portion 29 and the lead wire fixing member 12 is present on the top surface opening side of the cutout portion 17, the dust or the like is blocked by the core 2 and can be prevented from entering the motor 6.

Further, dust and moisture from the outside can be intercepted by the insertion portion 43, the narrow portion 28, the flange contact surface 35, and the core contact surface 36 of the lead wire fixing member 12. When dust and moisture from the outside are further intercepted, the insertion hole extending portion 44 of the lead wire fixing member 12 is bound by a binding band (intulok tie) or the like in a state where the lead wire 10 (the protective tube 11) is inserted, and thus, the durability against dust and moisture can be expected to be further improved. When the insertion hole extending portion 44 is bound by the binding portion, the strength of the thick portion 32 can be increased by providing the insertion hole extending portion 44 with the thick portion 32 having a thickness from the inner peripheral surface to the outer peripheral surface larger than the thickness of the surrounding area, and therefore, the binding can be performed based on the thick portion 32, and the deformation of the entire lead wire fixing member 12 can be suppressed.

(embodiment mode 2)

A second embodiment of the present invention will be described with reference to the drawings.

The lead wire fixing member 12 of the present embodiment will be described with reference to fig. 11. Fig. 11 is a side sectional view of the lead wire fixing member 12, and the structure of the extension portion 50 and the insulator engagement groove 52 is different from that of fig. 6. In addition, the description of the common components and mounting method is repeated as in embodiment 1, and thus is omitted.

The extending portion 50 is formed by extending the inner peripheral end of the wedge-shaped groove 38 of the inner peripheral portion 31 in the direction of the core contact surface 36. The insulator engagement groove 52 is formed in an コ shape as viewed in side cross section by the insertion hole end portion 51 and the extension portion 50. The extension length and thickness of the extension portion 50 are selected to be appropriate for the purpose of engaging and holding the top surface of the insulator 3, which is the outer wall of the insulator 3, with the lead wire fixing member 12. The コ -shaped insulator engagement groove 52 is selected to have a width suitable for the outer wall of the insulator 3 for the purpose of engaging and holding the outer wall of the insulator 3.

By adopting the above configuration, in addition to the holding by the fastener engaging portion 13 and the tapered engaging portion 40 as described in embodiment 1, the holding of the lead wire fastener 12 by the outer wall of the insulator 3 and the コ -shaped insulator engaging groove 52 can be realized, and a stronger grip can be expected. Even when the radial thickness of the yoke portion 7 of the core 2 is reduced due to the downsizing of the motor and the design of the motor, and it is difficult to form the stator engaging portion 13 of the insulator 3, the lead wire stator 12 can be held by the outer wall of the insulator 3 and the コ -shaped insulator engaging groove 52.

While the lead wire fixing member 12 is also held by the structure of embodiment 1 in embodiment 2, the lead wire fixing member 12 may be held by the structure of embodiment 2, that is, the outer wall of the insulator 3 and the コ -shaped insulator engagement groove 52.

Industrial applicability

The motor of the invention can maintain the endurance to dust and moisture no matter what the specification of the leading wire front end, and can realize the automation of assembly.

Description of reference numerals

1. 111 stator

2. 112 iron core

3 insulating part

4. 113 winding

5 terminal connection part

6 electric motor

7 yoke iron part

8 circuit board group

9 Circuit Board

10. 114 pinout

11 protective tube

12. 115 leading-out wire fixing piece

13 fastener engaging part

14. 14a, 14b protrusions

15. 15a, 15b notch

17 notch part

19 center shaft

20 outside diameter of the insulator

21 stopper

22 root of a tree

23 plane of wiring

24 outer diameter side bulge end face

25 inner diameter side bulge end face

26 bulge part

27 insertion hole

28 narrow part

29 outer peripheral portion

30 connecting part

31 inner peripheral portion

32 thick wall part

33 cover part

34 flange

35 flange contact surface

36 iron core contact surface

37 circuit board retention rib

38 wedge-shaped groove

39 circuit board contact surface

40 tapered engaging parts

41 through hole

43 insertion part

44 through-hole extension

45 wire

46 insulating coating film

47 dotted arrow

48 edge A

49 side B

50 extension part

51 end of the insertion hole

52 insulating member engaging groove

Claims

1. An electric motor, comprising:

a stator;

a circuit board disposed on one end side in an axial direction of the stator;

lead-out wires led out from the circuit board;

a bottomed cylindrical case that holds the stator in an internal space from the one end side;

a notch portion provided from the top surface opening toward the bottom surface on the side surface of the housing; and

and a lead wire fixing member for fixing the lead wire to the notch portion while holding the lead wire.

2. The motor of claim 1, wherein:

the stator includes:

an iron core formed in a ring shape;

a winding wound around the core; and

an insulator for insulating the core from the winding,

the insulating member has a fixing member engaging portion that protrudes in the outer circumferential direction and engages with the lead wire fixing member,

the outgoing line fixing piece is fixed to the fixing piece clamping portion.

3. The motor according to claim 1 or 2, characterized in that:

the stator includes:

an iron core formed in a ring shape;

a winding wound around the core; and

an insulator for insulating the core from the winding,

the lead-out wire fixing member is fixed to the one end side of the insulating member.

4. The motor of claim 2, wherein:

the fastener engaging portion includes:

a root portion protruding from the insulator in an outer circumferential direction; and

and a stopper portion that protrudes from a tip of the base portion in a protruding direction in a tangential direction of the ring shape and restricts movement of the lead wire fixing member in an outer circumferential direction.

5. The motor according to claim 2 or 4, wherein:

the end part of the outer periphery of the leading-out wire fixing piece is consistent with the outer periphery of the iron core.

6. The motor according to any one of claims 2, 4, and 5, wherein:

the lead wire fixing member has:

an inner peripheral portion located on an inner peripheral surface of the housing;

an outer peripheral portion located on an outer peripheral surface of the housing;

a connecting portion connecting the inner circumferential portion and the outer circumferential portion; and

and an insertion hole penetrating the inner peripheral portion, the outer peripheral portion, and the connection portion, and through which the lead wire is inserted.

7. The motor of claim 6, wherein:

the lead wire fixing member sandwiches a side surface of the housing, on which the cutout portion is formed, with the inner peripheral portion and the outer peripheral portion.

8. The motor of claim 6, wherein:

the lead wire fixing member sandwiches the fixing member engaging portion with the inner circumferential portion and the outer circumferential portion.

9. The motor of claim 6, wherein:

the lead wire fixing member radially sandwiches the side surface of the housing, on which the cutout portion is formed, with the inner circumferential portion and the outer circumferential portion, and radially sandwiches the fixing member engaging portion with the inner circumferential portion and the outer circumferential portion,

the side surface of the housing and the fixing piece engaging portion clamp the connecting portion from the circumferential direction.

10. The motor of claim 6, wherein:

an end portion of the outer peripheral portion of the lead wire fixing member, the end portion being close to a top surface opening side of the housing, is located on the same plane as the top surface opening of the housing.

11. The motor of claim 6, wherein:

an end portion of the outer peripheral portion of the lead wire fixing member closer to the top surface opening side of the case covers the iron core.

12. The motor of claim 6, wherein:

the lead wire fixing member has an insertion hole extension portion which is hollow cylindrical and protrudes from the outer peripheral portion in the outer peripheral direction to extend the insertion hole,

the insertion hole extension has a thick portion whose thickness from the inner circumferential surface to the outer circumferential surface is thicker than that of the surrounding portion in a cross section perpendicular to the extension direction.

13. The motor of claim 12, wherein:

the insertion hole extension portion has a narrowed portion that narrows the insertion hole by extending in a radially inward direction at a distal end portion in an extension direction.

14. The motor of claim 6, wherein:

the height of the lead wire fixing member in the axial direction is different between the inner peripheral portion and the outer peripheral portion.

15. The motor according to claim 12 or 13, wherein:

the outlet includes:

a plurality of conductive lines;

an insulating cover covering each of the plurality of wires; and

a protective tube bounding a plurality of said insulating covers,

the motor includes: a packing part for packing the through hole extending part under the state that the protection pipe is inserted in the through hole extending part.