JP7385524B2 - motor - Google Patents

Description

TECHNICAL FIELD The present invention relates to a motor equipped with a shielded wire drawn out to the outside of a motor case.

Conventionally, a motor is known that includes a motor main body having a rotor and a stator, and a motor housing in which the motor main body is housed (for example, see Patent Document 1). The motor described in Patent Document 1 includes an encoder for detecting the rotational speed and rotational position of the rotor. The encoder includes a sensor magnet attached to a rotor, a magnetically sensitive element arranged to face the sensor magnet, and a sensor substrate on which the magnetically sensitive element is mounted. A sensor output line is connected to the sensor board. The sensor output line is, for example, a shielded wire that includes a core wire, a shield material that covers the core wire, and an insulating coating that covers the shield material.

In the motor described in Patent Document 1, the motor housing includes a cylindrical case, a first bearing holder arranged on the opposite output side of the cylindrical case, and a second bearing holder arranged on the output side of the cylindrical case. It is equipped with An encoder cover in which the encoder is housed is attached to the non-output side of the first bearing holder. A notch is formed in the encoder cover, and this notch forms a gap between the encoder cover and the first bearing holder. A bush is inserted into this gap. The sensor output line is routed so as to pass through the bush, and the sensor output line that has passed through the bush is drawn out to the outside in the radial direction of the motor.

In the motor described in Patent Document 1, a wiring fixing part for fixing the sensor output line outside the motor housing is formed in the first bearing holder, and the wiring fixing part is formed in the first bearing holder to pass through the bush and be drawn out to the outside of the encoder cover. The sensor output line is fixed to the wiring fixing part. In the motor described in Patent Document 1, the sensor output line is fixed to a wiring fixing part to prevent the sensor output line from being pulled out when a pulling force for pulling out the sensor output line is applied to the sensor output line. That is, in the motor described in Patent Document 1, by fixing the sensor output line to the wiring fixing part, damage to the connecting part between the sensor output line and the sensor board is prevented when a pulling force is applied to the sensor output line. are doing.

Japanese Patent Application Publication No. 2013-9570

In the motor described in Patent Document 1, the sensor output line is fixed to a wiring fixing part arranged outside the motor housing, and the fixed part of the sensor output line appears on the exterior of the motor. Therefore, in the case of the motor described in Patent Document 1, the appearance of the motor may become poor.

Therefore, an object of the present invention is to provide a motor that includes a motor main body having a rotor and a stator, a motor case in which the motor main body is housed, and a shield wire drawn out toward the outside of the motor case. To provide a motor capable of improving its appearance even though it is possible to prevent a shield wire from being pulled out when a force is applied.

In order to solve the above problems, the motor of the present invention includes a motor body having a rotor and a stator, a motor case in which the motor body is housed, a detection mechanism housed in the motor case, and a motor from the detection mechanism to the motor case. The shield wire is made up of a core wire, a shield material that covers the core wire, and a rubber bush to prevent liquid from entering the inside of the motor case. The shield wire has a core wire exposed part where the shield material and the insulation film are removed to expose the core wire, and a core wire covering part where the core wire is covered with the shield material and the insulation film. A shielding material folded part is formed in which the shielding material is folded back on the outer peripheral surface of the insulation coating on the core wire covering part side at the boundary part between the core wire exposed part and the core wire covering part. The exposed portion is placed inside the motor case, the bush is attached to the motor case, the bush has an insertion hole through which the shield wire is inserted, and the insertion hole has a small diameter through which the core wire covering portion is placed. an inner circumferential surface portion, and a large-diameter inner circumferential surface portion on which a shield material folded portion is arranged and whose inner diameter is larger than that of the small-diameter inner circumferential surface portion; The diameter inner peripheral surface part is arranged on the inside side of the motor case, and a step surface is formed at the boundary between the large diameter inner peripheral surface part and the small diameter inner peripheral surface part, with which the shield material folded part comes into contact. , is characterized in that it is adhesively fixed to the large-diameter inner circumferential surface.

In the motor of the present invention, a shielding material folded portion in which the shielding material is folded back is formed on the outer circumferential surface of the insulation coating on the core wire covering portion side at the boundary portion between the exposed core wire portion and the core wire covering portion of the shield wire. has been done. Further, in the present invention, the insertion hole of the bush attached to the motor case includes a small diameter inner circumferential surface portion where the core wire covering portion is disposed, and a large diameter inner circumferential surface portion where the shield material folded portion is disposed, The small-diameter inner circumferential surface portion is disposed on the outside of the motor case, and the large-diameter inner circumferential surface portion is disposed on the inside of the motor case. Furthermore, in the present invention, a step surface is formed at the boundary between the large-diameter inner circumferential surface part and the small-diameter inner circumferential surface part, with which the shield material folded part comes into contact, and the shield material folded part is bonded to the large-diameter inner circumferential surface part. Fixed.

Therefore, in the present invention, the shield wire is bonded to the stepped surface of the bush attached to the motor case, the shield material folded part of the shield wire, and the adhesive that adheres and fixes the shield material folded part to the large diameter inner peripheral surface of the bush. It becomes possible to prevent the shield wire from being pulled out when a pulling force is applied. Further, in the present invention, since the small diameter inner circumferential surface portion is disposed on the outside of the motor case and the large diameter inner circumferential surface portion is disposed on the inside side of the motor case, the large diameter inner circumferential surface of the folded portion of the shield material The adhesive part is not visible on the outside of the motor. Therefore, in the present invention, even if it is possible to prevent the shield wire from being pulled out when a pulling force is applied to the shield wire, it is possible to improve the appearance of the motor. Further, according to the present invention, it is possible to prevent the shield wire from being pulled out by using the shield material of the shield wire, so it is possible to simplify the configuration of the motor.

Furthermore, in the present invention, since the folded portion of the shield material is arranged and fixed with adhesive on the large diameter inner peripheral surface of the bush, the amount of protrusion of the folded portion of the shield material, which has a large outer diameter, into the inside of the motor case is suppressed. It becomes possible to do so. Therefore, in the present invention, it is possible to arrange the shield material folded part inside the motor case even if the space for arranging the shield material folded part is narrowed or even if there is no space provided for the shield material folded part. become. Therefore, in the present invention, it is possible to reduce the influence that the folded portion of the shield material has on the assembly of the motor inside the motor case, and as a result, it is possible to assemble the motor easily. Further, according to the present invention, it is possible to reduce the influence of the folded portion of the shield material on the components disposed inside the motor case, so it is possible to increase the degree of freedom in designing the motor.

In the present invention, in the shield material folded portion, the shield material folded back onto the outer circumferential surface of the insulating coating is preferably twisted in the circumferential direction of the core wire covering portion. With this configuration, the outer diameter of the folded part of the shield material can be increased compared to the case where the shield material folded back on the outer peripheral surface of the insulating coating is not twisted in the circumferential direction of the core wire covering part. It becomes possible. Therefore, it is possible to increase the difference between the outer diameter of the shield material folded portion and the outer diameter of the core wire covering portion, thereby increasing the contact area between the stepped surface formed on the bush and the shield material folded portion. As a result, it is possible to effectively prevent the shield wire from being pulled out when a pulling force is applied to the shield wire.

In the present invention, for example, the insertion hole is composed of a small-diameter inner circumferential surface portion and a large-diameter inner circumferential surface portion. In this case, it becomes possible to simplify the shape of the insertion hole. Further, in the present invention, for example, the core wire covering portion is press-fitted into the small diameter inner circumferential surface portion.

In the present invention, the shield material folded portion is preferably covered with an adhesive that adhesively fixes the shield material folded portion to the large diameter inner circumferential surface portion. With this configuration, it is possible to cover the shielding material folded over the outer circumferential surface of the insulating coating with adhesive. It becomes possible to ensure sex.

In the present invention, in the shield material folded portion, it is preferable that the tip of the shield material folded back onto the outer peripheral surface of the insulating coating faces the outside of the motor case. That is, in the shield material folded portion, it is preferable that the tip of the shield material folded back onto the outer peripheral surface of the insulating coating does not face the core wire exposed portion side. With this configuration, it is possible to prevent the tip of the shield material from coming into contact with the core wire. Therefore, it becomes easier to ensure insulation between the shield material and the core wire.

As described above, the present invention provides a motor including a motor main body having a rotor and a stator, a motor case in which the motor main body is housed, and a shield wire drawn out toward the outside of the motor case. Even if it is possible to prevent the shield wire from being pulled out when a pulling force is applied, it is possible to improve the appearance of the motor.

FIG. 1 is a perspective view of a motor according to an embodiment of the present invention. 2 is a sectional view of the motor shown in FIG. 1. FIG. FIG. 3 is a diagram for explaining the configuration of a shield wire and a bush shown in FIG. 2. FIG. 2 is a perspective view of a shield wire, a cover, etc. shown in FIG. 1. FIG. FIG. 5 is an exploded perspective view of the cover, bush, and bush cover shown in FIG. 4. FIG. FIG. 6 is an exploded perspective view showing the cover, bush, and bush cover shown in FIG. 5 from different directions.

Embodiments of the present invention will be described below with reference to the drawings.

(Overall configuration of motor)
FIG. 1 is a perspective view of a motor 1 according to an embodiment of the invention. FIG. 2 is a sectional view of the motor 1 shown in FIG. 1.

The motor 1 of this embodiment is an inner rotor type motor. The motor 1 includes a motor body 4 having a rotor 2 and a stator 3, a motor case 5 in which the motor body 4 is housed, and a detection mechanism 6 for detecting the rotational speed and rotational position of the rotor 2. There is. The motor 1 also includes a power supply line 7 for supplying power to the motor body 4 and a shielded line 8 connected to the detection mechanism 6.

The rotor 2 includes a rotating shaft 11 and a driving magnet 12 fixed to the rotating shaft 11. The output side end of the rotating shaft 11 protrudes to the outside of the motor case 5. The stator 3 is arranged on the outer peripheral side of the driving magnet 12. The stator 3 includes a stator core 13 and a drive coil 15 wound around the salient poles of the stator core 13 via an insulator 14 . The end of the driving coil 15 is fixed by being wound around a terminal pin fixed to the insulator 14, and a substrate 16 is soldered and fixed to this terminal pin. One end of the power supply line 7 is fixed to the board 16 by soldering.

In the following explanation, the axial direction of the rotating shaft 11 (that is, the axial direction of the rotor 2, the X direction in FIG. 1, etc.) is referred to as the "front-back direction", and the Z direction in FIG. shall be. In addition, the output side (X1 direction side in FIG. 1, etc.) of the rotating shaft 11 in the longitudinal direction (axial direction of the rotating shaft 11) is defined as the "front" side, and the opposite output side of the rotating shaft 11 in the longitudinal direction ( The X2 direction side in Figure 1, etc.) is defined as the "back" side, the Z1 direction side in Figure 1, etc., which is one side in the vertical direction, is defined as the "top" side, and the other side in the vertical direction, in Figure 1, etc. The Z2 direction side is defined as the "down" side.

The detection mechanism 6 is a magnetic rotary encoder. The detection mechanism 6 includes a detection magnet 20 and a flat board 21 arranged behind the detection magnet 20. The substrate 21 is arranged so that the thickness direction of the substrate 21 and the front-rear direction coincide with each other. A magnetoresistive element and a Hall element are mounted on the front surface of the substrate 21. The detection magnet 20 is fixed to a magnet holder 22. The magnet holder 22 is fixed to the rear end of the rotating shaft 11. The substrate 21 is fixed to a substrate holder 23. The board holder 23 is fixed to a bearing holder 27, which will be described later, and which constitutes the motor case 5.

The motor case 5 includes a cylindrical case body 25 that is open in the front-rear direction, a bearing holder 26 fixed to the front end of the case body 25, a bearing holder 27 fixed to the rear end of the case body 25, and a power supply line 7. and a cover 28 that covers the connecting portion between the board 16 and the board 16, and a cover 29 that covers the detection mechanism 6. A bearing 30 that rotatably supports the rotating shaft 11 is attached to the bearing holder 26 . A bearing 31 that rotatably supports the rotating shaft 11 is attached to the bearing holder 27 .

The cover 28 is fixed to the upper surface of the case body 25. A rubber bush 32 is attached between the cover 28 and the case body 25 to prevent liquid such as water from entering the motor case 5. The bush 32 is formed with an insertion hole 32a through which the power supply line 7 is inserted. The power supply line 7 is drawn out from the motor case 5 through the insertion hole 32a.

The cover 29 is fixed to the rear surface of the bearing holder 27. As described above, the cover 29 covers the detection mechanism 6, and the detection mechanism 6 is housed in the motor case 5. Further, as described above, the shield wire 8 is connected to the detection mechanism 6. Specifically, one end of the shielded wire 8 is connected to the board 21 via the connector 33. The shielded wire 8 is drawn out from the detection mechanism 6 toward the outside of the motor case 5. Specifically, the shield wire 8 is drawn out toward the outside of the cover 29. The configuration of the shielded wire 8 and the configuration of the lead-out portion of the shielded wire 8 will be described below.

(Configuration of shielded wire and configuration of shielded wire lead-out part)
FIG. 3 is a diagram for explaining the configuration of the shield wire 8 and bush 43 shown in FIG. 2. As shown in FIG. FIG. 4 is a perspective view of the shield wire 8, cover 29, etc. shown in FIG. FIG. 5 is an exploded perspective view of the cover 29, bush 43, and bush cover 44 shown in FIG. FIG. 6 is an exploded perspective view showing the cover 29, bush 43, and bush cover 44 shown in FIG. 5 from different directions.

The shield wire 8 includes a core wire 36, a shield material 37 that covers the core wire 36, and an insulating coating 38 that covers the shield material 37 (see FIG. 3). The shielded wire 8 of this embodiment includes a plurality of core wires 36, and the shield material 37 covers the plurality of core wires 36. The core wire 36 is composed of a core wire (conductor wire) made of copper wire or the like and an insulating coating covering the core wire. The shield material 37 is made of copper wire or the like knitted in a net shape. The shield wire 8 includes a core wire exposed portion 8a where the shield material 37 and the insulation coating 38 are removed to expose the core wire 36, and a core wire covering portion 8b where the core wire 36 is covered with the shield material 37 and the insulation coating 38. is formed. Specifically, both ends of the shielded wire 8 are core wire exposed portions 8a, and the portion of the shielded wire 8 excluding the core wire exposed portions 8a is a core wire covered portion 8b.

A core wire covering portion 8b is provided at the boundary between the core wire exposed portion 8a and the core wire covering portion 8b on one end side of the shielded wire 8 (specifically, the side of the shielded wire 8 connected to the board 21). A shield material folded portion 8c, in which the shield material 37 is folded back, is formed on the outer peripheral surface of the side insulating coating 38 (see FIG. 3). In the shield material folded part 8c, the shield material 37 exposed to the outside after the insulation coating 38 is removed is folded back once toward the core wire coating part 8b, and the shield folded back on the outer peripheral surface of the insulation coating 38 is folded back once toward the core wire coating part 8b. The tip of the material 37 faces toward the core wire covering portion 8b. In the shield material folded portion 8c, the shield material 37 folded back onto the outer peripheral surface of the insulating coating 38 is twisted in the circumferential direction of the core wire covering portion 8b. The outer diameter of the shield material folded portion 8c is larger than the outer diameter of the core wire covering portion 8b.

As described above, the shield wire 8 is drawn out toward the outside of the cover 29. The cover 29 is made of resin. The cover 29 is formed into a substantially rectangular cylindrical shape with a bottom at the rear end. The cover 29 includes an upper wall portion 29a that constitutes the upper surface of the cover 29. A rubber bush 43 is attached to the cover 29 to prevent liquid from entering the motor case 5. That is, the motor 1 includes a rubber bush 43 for preventing liquid from entering the motor case 5 , and the bush 43 is attached to the motor case 5 .

A bush holding portion 29b that holds the bush 43 is formed in the cover 29. The bush holding portion 29b is formed on the upper wall portion 29a. That is, the bush 43 is attached to the side wall of the motor case 5 (specifically, the upper side wall of the cover 29). A notch 29c in which the bush 43 is placed is formed in the bush holding portion 29b. The notch 29c is cut out in a U-shape from the front end of the upper wall portion 29a toward the rear side. Further, a support wall portion 29d that supports the bush 43 from below is formed in the bush holding portion 29b. The support wall portion 29d is arranged below the notch 29c.

A U-shaped notch 29e is formed in the support wall portion 29d. The notch 29e is cut out from the front end of the upper wall portion 29a toward the rear side. The outer shape of the notch 29e is smaller than the outer shape of the notch 29c, and as shown in FIG. 6, the upper surface of the support wall portion 29d is a plane perpendicular to the vertical direction. Further, as shown in FIG. 5, the lower surface of the support wall portion 29d is also a plane perpendicular to the vertical direction.

The bush 43 is formed with an insertion hole 43a through which the shield wire 8 is inserted. The insertion hole 43a passes through the bush 43 in the vertical direction. The insertion hole 43a includes a small-diameter inner circumferential surface portion 43b in which the core wire covering portion 8b is disposed, and a large-diameter inner circumferential surface portion 43c in which the shield material folded portion 8c is disposed and has an inner diameter larger than the small-diameter inner circumferential surface portion 43b. ing. The insertion hole 43a of this embodiment is composed of a small-diameter inner circumferential surface portion 43b and a large-diameter inner circumferential surface portion 43c.

The small diameter inner circumferential surface portion 43b is arranged above the large diameter inner circumferential surface portion 43c. That is, the small-diameter inner circumferential surface portion 43b of the bush 43 held by the bush holding portion 29b formed on the upper wall portion 29a is arranged on the outside of the motor case 5 (specifically, on the outside of the cover 29). At the same time, the large-diameter inner circumferential surface portion 43c is arranged inside the motor case 5 (specifically, inside the cover 29). A step surface 43d is formed at the boundary between the small-diameter inner circumferential surface portion 43b and the large-diameter inner circumferential surface portion 43c. The stepped surface 43d is an annular plane perpendicular to the vertical direction. Further, the step surface 43d is a plane facing downward.

A bush cover 44 is fixed to the upper surface of the upper wall portion 29a. The bush 43 is held by the bush holding portion 29b while being sandwiched between the support wall portion 29d and the bush cover 44. The front surface of the bush 43 and the front surface of the cover 29 are arranged at the same position in the front-rear direction. The bush cover 44 is formed with an insertion hole 44a that penetrates the bush cover 44 in the vertical direction.

A core wire exposed portion 8 a constituting one end of the shielded wire 8 (specifically, the end of the shielded wire 8 on the side connected to the board 21 ) is arranged inside the cover 29 . That is, the core wire exposed portion 8a is arranged inside the motor case 5. The shield wire 8 is drawn out from the cover 29 through the insertion hole 43a of the bush 43 and the insertion hole 44a of the bush cover 44. The shield material folded portion 8c is arranged on the large-diameter inner circumferential surface portion 43c of the bush 43. In this embodiment, the entire shield material folded portion 8c is disposed on the large-diameter inner circumferential surface portion 43c. A portion of the core wire exposed portion 8a is arranged in the notch 29e. A portion of the core wire covering portion 8b is disposed on the small diameter inner circumferential surface portion 43b of the bushing 43. The core wire covering portion 8b is press-fitted into the small diameter inner peripheral surface portion 43b.

The shield material folded portion 8c is in contact with the stepped surface 43d. Further, the shield material folded portion 8c is adhesively fixed to the large diameter inner circumferential surface portion 43c. That is, the shield material folded portion 8c is adhesively fixed to the large diameter inner circumferential surface portion 43c while in contact with the stepped surface 43d. Specifically, the shield material folded portion 8c is adhesively fixed to the large diameter inner circumferential surface portion 43c with the upper end of the shield material folded portion 8c in contact with the stepped surface 43d. As shown in FIG. 3, the shield material folded portion 8c is covered with an adhesive 39 that adhesively fixes the shield material folded portion 8c to the large diameter inner peripheral surface portion 43c. The adhesive 39 covers the entire shield material folded portion 8c. Further, the adhesive 39 is filled in the large-diameter inner circumferential surface portion 43c.

As described above, in the shield material folded portion 8c, the tip of the shield material 37 folded back onto the outer circumferential surface of the insulating coating 38 faces the core wire covering portion 8b, so that the shield material 37 is folded back onto the outer circumferential surface of the insulating coating 38. The tip of the shield material 37 that has been opened faces upward. That is, the tip of the shield material 37 folded back onto the outer peripheral surface of the insulating coating 38 faces the outside of the motor case 5 (specifically, the outside of the cover 29).

(Main effects of this form)
As described above, in this embodiment, the shield material folded portion 8c is formed at the boundary between the exposed core wire portion 8a and the core wire covered portion 8b of the shield wire 8. In addition, in this embodiment, the shield material folded portion 8c disposed on the large-diameter inner circumferential surface portion 43c of the bush 43 is adhesively fixed to the large-diameter inner circumferential surface portion 43c with the adhesive 39 while in contact with the stepped surface 43d of the bush 43. has been done. Therefore, in this embodiment, the stepped surface 43d, the shield material folded portion 8c, and the adhesive 39 can prevent the shield wire 8 from being pulled out when a pulling force is applied to the shield wire 8.

Further, in this embodiment, since the small diameter inner circumferential surface portion 43b is disposed on the outside of the motor case 5, and the large diameter inner circumferential surface portion 43c is disposed on the inside of the motor case 5, the shield material folded portion 8c is The adhesive portion to the large-diameter inner circumferential surface portion 43c does not appear on the exterior of the motor 1. Therefore, in this embodiment, even if it is possible to prevent the shield wire 8 from being pulled out when a pulling force is applied to the shield wire 8, it is possible to improve the appearance of the motor 1. Furthermore, in this embodiment, it is possible to prevent the shield wire 8 from being pulled out by using the shield material 37 of the shield wire 8, so that the configuration of the motor 1 can be simplified. Further, in this embodiment, unlike the motor described in Patent Document 1, there is no need to form a wiring fixing part on the bearing holder 27, so the configuration of the bearing holder 27 can be simplified.

Furthermore, in this embodiment, since the shield material folded part 8c is arranged and adhesively fixed to the large diameter inner circumferential surface part 43c of the bush 43, the shield material folded part 8c having a large outer diameter is attached to the inside of the motor case 5. It becomes possible to suppress the amount of protrusion. In particular, in this embodiment, the shield material folded portion 8c does not protrude into the interior of the motor case 5 because the entire shield material folded portion 8c is disposed on the large diameter inner circumferential surface portion 43c.

Therefore, in this embodiment, the shield material folded portion 8c can be arranged inside the motor case 5 without providing a space for arranging the shield material folded portion 8c. Therefore, in this embodiment, it is possible to reduce the influence that the shield material folded portion 8c has on the assembly of the motor 1 inside the motor case 5, and as a result, it is possible to assemble the motor 1 easily. Become. Furthermore, in this embodiment, it is possible to reduce the influence of the shield material folded portion 8c on the components disposed inside the motor case 5, so it is possible to increase the degree of freedom in designing the motor 1. Become.

In this embodiment, the shield material 37 folded back onto the outer peripheral surface of the insulating coating 38 is twisted in the circumferential direction of the core wire covering portion 8b at the shield material folded portion 8c. Therefore, in this embodiment, the outer diameter of the shield material folded portion 8c is smaller than the case where the shield material 37 folded back on the outer peripheral surface of the insulating coating 38 is not twisted in the circumferential direction of the core wire covering portion 8b. It becomes possible to make it bigger. Therefore, in this embodiment, the difference between the outer diameter of the shield material folded portion 8c and the outer diameter of the core wire covering portion 8b is increased to increase the contact area between the step surface 43d of the bush 43 and the shield material folded portion 8c. becomes possible. As a result, in this embodiment, it is possible to effectively prevent the shielded wire 8 from being pulled out when a pulling force is applied to the shielded wire 8.

In this embodiment, the shield material folded portion 8c is covered with an adhesive 39. That is, in this embodiment, the shield material 37 folded back onto the outer peripheral surface of the insulating coating 38 is covered with the adhesive 39. Therefore, in this embodiment, using the adhesive 39, it is possible to ensure the insulation of the shield material 37 folded back onto the outer circumferential surface of the insulating coating 38.

In this embodiment, the tip of the shielding material 37 folded back onto the outer circumferential surface of the insulating coating 38 at the shielding material folding portion 8c faces the core wire covering portion 8b side and does not face the core wire exposed portion 8a side. Therefore, in this embodiment, it is possible to prevent the tip of the shield material 37 from coming into contact with the core wire 36. Therefore, in this embodiment, the insulation between the shield material 37 and the core wire 36 can be easily ensured.

In this embodiment, the shield material folded portion 8c disposed on the large-diameter inner circumferential surface portion 43c of the bush 43 is adhesively fixed to the large-diameter inner circumferential surface portion 43c. Therefore, in this embodiment, rotation of the shield wire 8 with respect to the bush 43 can be prevented.

(Other embodiments)
Although the embodiment described above is an example of a preferred embodiment of the present invention, it is not limited thereto, and various modifications can be made without changing the gist of the present invention.

In the above-described embodiment, a portion of the shield material folded portion 8c may protrude from the large-diameter inner circumferential surface portion 43c to the inside of the cover 29. Even in this case, it is possible to arrange the shield material folded portion 8c inside the motor case 5 even if the space for arranging the shield material folded portion 8c is narrowed. Therefore, substantially the same effect as the above embodiment can be obtained.

In the embodiment described above, the insulation coating 38 is removed and the shield material 37 exposed to the outside is folded back once toward the core wire covering portion 8b at the shield material folded portion 8c. The shield material 37 exposed to the outside after the insulation coating 38 is removed may be folded back multiple times. In this case, the tip of the shield material 37 folded back onto the outer peripheral surface of the insulating coating 38 may face the core wire exposed portion 8a side. Further, in the shield material folded portion 8c, the shield material 37 folded back onto the outer circumferential surface of the insulating coating 38 does not need to be twisted in the circumferential direction of the core wire covering portion 8b.

In the embodiment described above, the core wire covering portion 8b does not need to be press-fitted into the small diameter inner circumferential surface portion 43b. Moreover, in the embodiment described above, the detection mechanism 6 may be a detection mechanism other than a rotary encoder. Further, in the above embodiment, the motor 1 is an inner rotor type motor, but the motor to which the configuration of the present invention is applied may be an outer rotor type motor.

1 Motor 2 Rotor 3 Stator 4 Motor main body 5 Motor case 6 Detection mechanism 8 Shield wire 8a Core wire exposed portion 8b Core wire covering portion 8c Shield material folded portion 36 Core wire 37 Shield material 38 Insulating coating 39 Adhesive 43 Bush 43a Insertion Hole 43b Small diameter inner circumferential surface portion 43c Large diameter inner circumferential surface portion 43d Step surface

Claims (6)

A motor body having a rotor and a stator, a motor case in which the motor body is housed, a detection mechanism housed in the motor case, and a shielded wire drawn out from the detection mechanism toward the outside of the motor case. , a rubber bush for preventing liquid from entering the inside of the motor case;
The shield wire includes a core wire, a shield material covering the core wire, and an insulating coating covering the shield material,
The shield wire includes a core wire exposed portion where the shield material and the insulation coating are removed to expose the core wire, and a core wire covering portion where the core wire is covered with the shield material and the insulation coating. formed,
A shield material folded portion in which the shield material is folded back is formed on the outer peripheral surface of the insulating coating on the core wire covering portion side at a boundary portion between the core wire exposed portion and the core wire covering portion;
The core wire exposed portion is arranged inside the motor case,
the bushing is attached to the motor case,
The bush is formed with an insertion hole through which the shield wire is inserted,
The insertion hole includes a small diameter inner circumferential surface portion where the core wire covering portion is disposed, and a large diameter inner circumferential surface portion where the shield material folded portion is disposed and has an inner diameter larger than the small diameter inner circumferential surface portion,
The small diameter inner circumferential surface portion is disposed on the outside of the motor case, and the large diameter inner circumferential surface portion is disposed on the inside of the motor case,
A step surface is formed at the boundary between the large-diameter inner circumferential surface portion and the small-diameter inner circumferential surface portion, with which the shield material folded portion comes into contact;
A motor characterized in that the shield material folded portion is adhesively fixed to the large-diameter inner circumferential surface portion. 2. The motor according to claim 1, wherein in the shield material folded portion, the shield material folded back onto the outer circumferential surface of the insulating coating is twisted in the circumferential direction of the core wire covering portion. 3. The motor according to claim 1, wherein the insertion hole is comprised of the small-diameter inner circumferential surface portion and the large-diameter inner circumferential surface portion. 4. The motor according to claim 1, wherein the core wire covering section is press-fitted into the small diameter inner circumferential surface section. 5. The motor according to claim 1, wherein the shield material folded portion is covered with an adhesive that adhesively fixes the shield material folded portion to the large diameter inner circumferential surface portion. 6. The shield material according to claim 1, wherein, in the shield material folded portion, a tip of the shield material folded back onto the outer circumferential surface of the insulating coating faces the outside of the motor case. motor.

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