TWI707124B - Method of assembling encoder, encoder and servo motor - Google Patents

Abstract

An encoder (100-1) of this invention includes a substrate (1), a substrate fixing portion (3), and an encoder lead wire (4). The encoder (100-1) further includes an electronic component (2) disposed on a second substrate surface (1b), and a bottomed-cylindrical-shaped cover (5) which has a bottom portion (5a) facing the electronic component (2), and a cylindrical portion (5b) rotatably fitted onto the outer peripheral portion (3b) of the substrate fixing portion (3) and formed with an opening portion (14) allowing at least the encoder lead wire (4) to pass through. The encoder (100-1) further includes a suppression portion which suppresses positional displacement of the encoder lead wire (4) in an axial direction of the substrate fixing portion (3) and extends from an edge of the opening portion (14) in a direction along the rotating direction of the cover (5).

Description

Encoder assembly method, encoder and servo motor

The present invention relates to a method for assembling an encoder, an encoder, and a servo motor for detecting the rotation position of a rotor.

In Patent Document 1, a technique for miniaturizing an encoder has been disclosed. In the encoder disclosed in Patent Document 1, in order to reduce the size of the encoder, an insulating member is provided in the gap between the inner surface of the cover and the outer periphery of the substrate. The cover system refers to a conductive member that is formed into a bottomed cylindrical shape to cover the substrate on which the electronic parts are installed in order to suppress the decrease in insulation performance caused by the penetration of dust, metal pieces, etc. into the encoder. By providing an insulating member, even if the gap between the cylindrical portion of the cover and the substrate is narrowed, the increase in induced voltage generated between the wiring member provided in the lid and the cylindrical portion of the cover can be suppressed . Therefore, it is possible to reduce the size of the encoder in the radial direction while suppressing the reduction in the function of the encoder.

[Prior Technical Literature] [Patent Literature]

Patent Document 1: International Publication No. 2013/098935

In the encoder disclosed in Patent Document 1, the workability when connecting an encoder lead wire to an external device is considered, and it is necessary to provide an extra length of the encoder lead wire. Therefore, after the encoder wire is passed through to the opening formed in the cylindrical part of the cover, when the cylindrical part of the cover is moved close to the motor bracket, the remaining length of the encoder wire Part of it may be caught in the gap between the electronic component and the bottom of the cover. The electronic component is arranged at a position facing the bottom of the cover. When the excess length of the encoder wire is clamped in this gap, it is impossible to securely fix the cover to the motor bracket. Therefore, in the encoder disclosed in Patent Document 1, in order to prevent the excess length of the encoder wire from being caught in the gap, the axial length of the cylindrical portion of the cover must be increased by the wire diameter of the encoder wire . As a result, the axial length of the cover body becomes longer, and there is a problem that the entire encoder cannot be reduced in size.

The present invention was developed in view of the above-mentioned problems, and its purpose is to obtain a device that can be clamped in the gap between the bottom and the electronic component even when the encoder wire arranged inside the cover has an excess length. Assembling method of encoder, encoder and servo motor that can easily move the encoder wire and can be miniaturized.

In order to solve the above-mentioned problems and achieve the objective, the present invention provides an assembling method of an encoder, the encoder includes: inner parts, a substrate and a cylindrical substrate fixing part, the substrate is on the second substrate surface Equipped with electronic components and a first connector electrically connected to the aforementioned electronic components, and the cylindrical substrate fixing portion is provided for the substrate The first substrate is surface-contacted to mount and fix the aforementioned substrate; the outer part has a bottomed cylindrical cover with a bottom and a cylindrical part, and can rotate relative to the aforementioned inner part, and the bottom is connected to the aforementioned electronic part Facing each other through a gap, the cylindrical portion is embedded in the outer periphery of the substrate fixing portion and an opening is formed; the relay connector is fixed to the opening in the cylindrical portion of the cover so as to close The outer peripheral side of the cylindrical portion; and the encoder wire, one end of which is connected to the first connector, and the other end is connected to the relay connector through the opening; the assembling method of the encoder includes the following steps : In the case where the encoder wire is clamped in the gap when the encoder wire is connected to the first connector and the relay connector, the outer part is rotated relative to the inner part to make the encoder lead from The step of moving the gap; and, after the moving, the step of fixing the cover to the substrate fixing portion.

The encoder of the present invention achieves the following effects: even when the encoder wire arranged inside the cover has an excess length, the encoder wire clamped between the bottom and the electronic part can be simply mobile.

1: substrate

1a: The first substrate surface

1b: Second substrate surface

1c, 3b, 5d, 8a1: outer periphery

1d: Notch

2: Electronic parts

3. 3A: PCB fixing part

3a: end

3c: protrusion

4: Encoder wire

4A: excess length

5: cover

5a: bottom

5b, 8a: Cylinder part

5b1: inner peripheral surface

5c: open end

5e: Flange

6, 6A, 6B: Inhibition part

7: Screw

8: bracket

8b: Board

9: The first connector

10: second connector

11: Third connector

12: Relay connector

13: Cable

14: Opening

15: Wall

16: first space

17: second space

18: area

19: Motor wire

20: Fourth connector

31: Through hole

32: recess

61: first end face

62: second end face

63: The first protrusion

64: second protrusion

100-1, 100-2: encoder

151: First Wall

152: second wall

153: The Third Wall

154: The Fourth Wall

200: Servo motor

300: Motor

301: Shell

302: Shaft

AX: central axis

CL, CL1: gap

D1: Axial

D2: Rotation direction

W1, W2, W3, W4: width

Figure 1 is a perspective view of the encoder according to Embodiment 1 of the present invention.

Figure 2 is a schematic diagram showing the opening formed in the cover shown in Figure 1.

Fig. 3 is the first diagram showing the state where the excess length of the encoder wire shown in Fig. 1 moves.

Fig. 4 is a second diagram showing the state where the excess length of the encoder wire shown in Fig. 1 moves.

Fig. 5 is a third diagram showing the state where the excess length of the encoder wire shown in Fig. 1 moves.

Fig. 6 is a fourth diagram showing the state where the excess length of the encoder wire shown in Fig. 1 moves.

Fig. 7 is a side view of the cover provided in the encoder of the first modification of the first embodiment.

Fig. 8 is a side view of the cover provided in the encoder of the second modification of the first embodiment.

Figure 9 is a perspective view of the encoder according to Embodiment 2 of the present invention.

Figure 10 is a side view of the cover provided in the encoder of the first modification of the second embodiment.

Figure 11 is a side view of the cover provided on the encoder of the second modification of the second embodiment.

Figure 12 is an external view of the servo motor according to the third embodiment of the present invention.

Hereinafter, the method of assembling the encoder, the encoder, and the servo motor according to the embodiment of the present invention will be described in detail based on the drawings. Furthermore, this invention is not limited by this embodiment.

[Embodiment 1]

Figure 1 is a perspective view of the encoder according to Embodiment 1 of the present invention. Figure 2 is a schematic diagram showing the opening formed in the cover shown in Figure 1. The encoder 100-1 of Embodiment 1 includes: a substrate 1 having a first substrate surface 1a and a second substrate surface 1b opposite to the first substrate surface 1a side; and an electronic component 2 provided on the second substrate Surface 1b; Cylindrical substrate fixing part 3. It has an end 3a that can be contacted by the first substrate surface 1a, and the substrate 1 is fixed to the end 3a; and an encoder wire 4, which is arranged at a position facing the second substrate surface 1b and is connected to the substrate 1. The electrical connection can transmit a signal indicating the rotation position of the rotor. In addition, the encoder 100-1 further includes a bottomed cylindrical cover 5 having a bottom portion 5a and a cylindrical portion 5b. The bottom portion 5a faces the electronic component 2 and the cylindrical portion 5b is used to make the electronic component The gap between 2 and the bottom 5a becomes smaller than the wire diameter of the encoder wire 4, and is rotatably embedded in the outer peripheral portion 8a1 of the cylindrical portion 8a of the bracket 8, and is formed so that at least the encoder wire 4 can pass The opening; and the restraining section 6, which is provided in the cylindrical section 5b, restrains the encoder wire 4 from shifting to the axial position of the substrate fixing section 3.

The axial direction extending through the central axis AX of the radial center of the substrate fixing portion 3 is equal to the direction indicated by the symbol D1 in the first and second figures. The rotation direction of the cover 5 is equal to the direction indicated by the symbol D2 in the first and second figures.

The substrate fixing portion 3 is detachably fixed to the axial end portion of the cylindrical portion 8a of the bracket 8 using screws 7. The bracket 8 is composed of a plate-shaped plate portion 8b and a cylindrical portion 8a. The plate-shaped plate portion 8b is a member that closes the axial end of a motor case (not shown). The portion 8a is provided on the end surface of the plate portion 8b on the side of the substrate fixing portion 3. The cylindrical portion 8a can also be manufactured by integrally forming with the plate portion 8b using an insulating material. Insulating materials, such as polybutylene terephthalate, polyphenylene sulfide, liquid crystal polymer, etc. The bracket 8 is manufactured by die-casting using insulating resin, so that the bracket 8 with a complicated shape can be manufactured inexpensively. The outer diameter of the cylindrical portion 8a of the holder 8 is larger than the outer diameter of the substrate fixing portion 3, and is approximately the same as the inner diameter of the cylindrical portion 5b of the cover 5. Also, although the substrate fixing part 3 is The above-mentioned insulating material is used and manufactured separately from the cylindrical portion 8a of the bracket 8 before being mounted on the bracket 8. However, an insulating material can also be used for manufacturing by integrally forming the cylindrical portion 8a of the bracket 8. By using the above-mentioned insulating material and manufacturing the substrate fixing portion 3 by a die casting method, the substrate fixing portion 3 with a complicated shape can be manufactured inexpensively. In addition, in this embodiment, although the substrate fixing part 3 and the cylindrical part 8a of the holder 8 are manufactured as different individuals, the structure of the substrate fixing part 3 and the holder 8 When the cylindrical portion 8a is manufactured by integral molding, the entire substrate fixing portion 3 and the cylindrical portion 8a manufactured by the integral molding may be used as the substrate fixing portion 3 or as the holder 8.

A protrusion 3c is formed in the board fixing portion 3. The protrusion 3c refers to a member having a protruding shape extending from the end 3a of the substrate fixing portion 3 in the axial direction. The protrusion 3c is formed at the corner formed by the end 3a of the substrate fixing portion 3 and the outer peripheral portion 3b of the substrate fixing portion 3. The end 3a of the substrate fixing portion 3 refers to the end on the opposite side to the bracket 8 side of the substrate fixing portion 3. In FIG. 1, although only one protrusion 3c is shown for the sake of simplification of description, a plurality of protrusions 3c are provided, and the plurality of protrusions 3c are arranged in the rotation direction separately from each other. In Fig. 2, the illustration of the protrusion 3c is omitted. The protrusion 3c is embedded in a recess 1d formed on the radially outer side of the substrate 1. The notch 1d refers to a concave portion that protrudes from the outer peripheral portion 1c of the substrate 1 toward the radial center of the substrate 1. Between the protrusion 3c and the recess 1d, an adhesive agent, not shown, is provided. Compared with the case where the adhesive is not provided, by providing the adhesive, the contact area between the recess 1d of the substrate 1 and the protrusion 3c can be increased, and the substrate 1 can be firmly fixed to the substrate fixing portion 3.

Furthermore, the axial length of the protrusion 3c may be as long as it can hold the substrate 1. However, for example, the front end of the protrusion 3c may protrude more than the second substrate surface 1b. The thickness of the axial direction is longer. By this, you can suppress The following influence: When the cover 5 is rotated, for example, a motor wire (not shown) arranged on the radially outer side of the protrusion 3c approaches the substrate 1, and noise from the motor wire is given to the electronic component 2 provided on the substrate 1. , Position detection department, etc. Therefore, by lengthening the protrusion 3c, it is possible to suppress a decrease in the detection accuracy of the rotation position of the rotor. The motor lead refers to the wiring that supplies power to the motor not shown.

The electronic component 2 may be, for example, a signal generating circuit for generating a signal indicating the rotation position of the rotor detected by the position detection unit, a signal output circuit for outputting the signal to the encoder lead 4, or the like, or It is a component that constitutes a power supply circuit that supplies power supplied from a servo amplifier (servo amplifier) provided outside the encoder 100-1 to the position detection unit. The electronic component 2 is, for example, an IC (Integrated Circuit), a resistor, a coil (coil), a capacitor (condenser), and the like. The number of electronic components 2 may be one or plural. In Fig. 1 and Fig. 2, in order to simplify the description, the electronic component 2 is simulated with a cylindrical structure. The position detection unit refers to an optical component that detects the rotation position of the rotor (not shown). For example, it is provided on the first substrate surface 1a of the substrate 1 inside the substrate fixing portion 3. The first substrate surface 1a refers to the end surface of the substrate 1 facing the substrate fixing portion 3.

In addition to the electronic components 2 provided on the second substrate surface 1b of the substrate 1, a first connector 9 is also provided. The second substrate surface 1b refers to the end surface of the substrate 1 facing the bottom 5a of the cover 5. The first connector 9 is electrically connected to the electronic component 2 and the position detection part via the pattern wiring on the substrate 1. The second connector 10 is connected to the first connector 9. One end of the encoder wire 4 is connected to the second connector 10. By connecting the second connector 10 to the first connector 9, the encoder wire 4 is electrically connected with the electronic component 2 and the position detection part. By using the first connector 9 and the second connector 10, the connection of the encoder wire 4 to the substrate 1 is facilitated. again Moreover, as long as the encoder wire 4 is electrically connected to the electronic component 2, the first connector 9 and the second connector 10 may not be used, and the encoder wire 4 may be directly connected to the substrate 1 by welding, for example. Wiring pattern. In addition, although one encoder wire 4 is shown in FIG. 1 and FIG. 2 for the sake of simplification of description, the encoder wire 4 refers to a signal group composed of a plurality of signal wires.

A third connector 11 is connected to the other end of the encoder wire 4. The third connector 11 is connected to the relay connector 12. The relay connector 12 refers to a connector for connecting the encoder lead 4 and a motor lead (not shown) to a servo amplifier provided outside the encoder 100-1. A cable 13 extending from the servo amplifier is connected to the relay connector 12. The relay connector 12 is fixed to the outer peripheral portion 5d of the cylindrical portion 5b of the lid body 5 so as to close the opening 14 formed in the cylindrical portion 5b of the lid body 5. The details of the opening 14 will be described later. Furthermore, the relay connector 12 is connected to the motor lead in addition to the second connector 10.

The cover 5 is a part used to suppress the degradation of the insulation performance caused by the penetration of dust, metal pieces, etc. into the encoder 100-1. The cover 5 may be formed into a cylindrical shape by die casting using the aforementioned insulating material, or may be formed into a cylindrical shape by die casting using metals such as copper alloy, cast iron, steel, and iron alloy. By manufacturing the cover 5 from metal, the electronic circuits existing inside the cover 5 can be protected from the magnetic field outside the cover 5.

Between the inner peripheral surface 5b1 of the cylindrical portion 5b of the cover 5 and the outer peripheral portion 8a1 of the cylindrical portion 8a of the holder 8, for example, an O ring (Oring) not shown is provided. When the cover 5 has been inserted into the cylindrical portion 8a of the holder 8, the gap between the cylindrical portion 8a of the holder 8 and the cover 5 is blocked by the O-ring, so that dust, metal pieces, etc. can be prevented from entering the cover Inside of 5. Also, as shown in Figure 2, on the side of the opening end 5c of the cover 5, there is formed an outer circumference from the cylindrical portion 5b of the cover 5 The portion 5d is a flange portion 5e extending toward the radially outer side. By screwing the screw 7 from the flange portion 5e toward the plate portion 8b of the bracket 8, the cover 5 can be fixed to the bracket 8.

An opening 14 is formed in the cylindrical portion 5b of the lid body 5, and a restraining portion 6 is provided in the opening 14. The restraining portion 6 refers to a member for restraining the position deviation of the encoder wire 4 in the axial direction when the cover 5 rotates. The restraining part 6 may be manufactured by integrally forming with the cover 5 or may be manufactured separately from the cover 5. In the case of using the restraining portion 6 manufactured separately from the lid 5, the restraining portion 6 can be fixed to the wall surface 15 where the opening portion 14 is formed by bonding or the like.

The restraining portion 6 extends from the first wall surface 151 in the rotation direction of the cover body 5 among the wall surfaces 15 forming the opening portion 14 to the second wall surface 152 facing the first wall surface 151. That is, the restraining portion 6 extends from the edge of the opening 14 toward the direction along the rotation direction of the cover 5. By providing the restraining portion 6 on the first wall surface 151, the third wall surface 153 located on the bottom 5a side of the cover 5 among the wall surfaces 15 forming the opening portion 14 and the restraining portion 6 facing the third wall surface 153 Between the first end surfaces 61, a first space 16 in the shape of a notch is formed. The axial width of the first space 16 is wider than the wire diameter of the encoder wire 4. Furthermore, as described above, since the encoder wire 4 is composed of a plurality of signal wires, the wire diameter of the encoder wire 4 can also be set to the thickness of the signal wire group formed by bundling the plurality of signal wires .

Furthermore, by providing the restraining portion 6 on the first wall surface 151, it is possible to restrain the fourth wall surface 154 on the side of the opening end 5c of the cover 5 and the fourth wall surface 154 among the wall surfaces 15 forming the opening 14 Between the second end surfaces 62 of the portion 6 is formed a second space 17 through which a motor wire (not shown) can pass.

When assembling the encoder 100-1, first, the substrate 1 is set on the substrate fixing part 3, and then the first connector 9 is connected to the second connector 10. The first connector 9 is connected to the second After the connector 10 is connected, the third connector 11 provided on the encoder wire 4 is pulled out from the inner side of the cylindrical portion 5b of the cover 5 through the opening 14 to the outer side of the cylindrical portion 5b of the cover 5. After the third connector 11 is pulled out of the cylindrical portion 5b of the cover 5, the relay connector 12 is connected to the third connector 11.

In this way, considering the connection workability of the third connector 11 to the relay connector 12, it is necessary to allow the encoder wire 4 to have a surplus length. However, when the encoder wire 4 has an excess length, when the cylindrical portion 5b of the cover 5 is inserted into the cylindrical portion 8a of the bracket 8, the excess length of the encoder wire 4 may be caught in the cover. The gap between the bottom 5a of 5 and the electronic component 2. Since the encoder 100-1 of the first embodiment has a structure in which the cover 5 is rotatably fitted into the cylindrical portion 8a of the holder 8, the cylindrical portion 5b of the cover 5 is already fitted into the cylindrical portion 8a of the holder 8. At this time, even if the excess length of the encoder wire 4 is sandwiched between the bottom 5a of the cover 5 and the electronic component 2, the cylindrical portion 5b of the cover 5 can still be pressed against the plate 8b of the bracket 8. In the state, by rotating the cover 5, the excess length of the encoder wire 4 is moved to the area outside the gap between the bottom 5a of the cover 5 and the electronic part 2 in the space of the cover 5, that is The area where the electronic component 2 and the cylindrical portion 5b of the cover 5 face each other.

Next, a description will be given of how the excess length of the encoder wire 4 is moved when the encoder 100-1 is assembled. Fig. 3 is the first diagram showing the state where the excess length of the encoder wire shown in Fig. 1 moves. Fig. 4 is a second diagram showing the state where the excess length of the encoder wire shown in Fig. 1 moves. Fig. 5 is a third diagram showing the state where the excess length of the encoder wire shown in Fig. 1 moves. Fig. 6 is a fourth diagram showing the state where the excess length of the encoder wire shown in Fig. 1 moves.

FIG. 3 shows the state where the excess length 4A of the encoder wire 4 is clamped in the gap CL1 between the bottom 5a of the cover 5 and the electronic component 2. The excess length part 4A refers to the middle part of the range from one end of the encoder wire 4 to the other end, for example.

Figure 4 shows the state of the encoder lead wire 4 when the cylindrical portion 5b of the cover 5 to which the relay connector 12 is fixed is pressed against the plate portion 8b of the bracket 8 and rotated in the clockwise direction . Along with the rotation of the cylindrical portion 5b of the cover 5, the remaining length 4A of the encoder wire 4 is rubbed against the bottom 5a of the cover 5 shown in Fig. 1, and from the bottom 5a of the cover 5 to the electronic parts The gap CL1 between 2 moves toward the area 18 where the electronic component 2 and the cylindrical portion 5b of the cover 5 face each other.

When the cover 5 is rotated in the clockwise direction from the state shown in Fig. 4, as shown in Fig. 5, the excess length 4A of the encoder wire 4 will be from the bottom 5a of the cover 5 and the electronic parts The gap CL1 between 2 is pushed out toward the area 18 where the electronic component 2 and the cylindrical portion 5b of the cover 5 face each other.

When the cover 5 is rotated in the counterclockwise direction from the state shown in Figure 5, as shown in Figure 6, the excess length 4A of the encoder wire 4 will be elongated and placed on the electronic components 2 and The area 18 where the cylindrical portion 5b of the cover 5 faces each other.

In this way, since the encoder 100-1 of the first embodiment has a structure in which the cover 5 is rotatably fitted into the cylindrical portion 8a of the holder 8, even if the excess length 4A of the encoder lead wire 4 is sandwiched by the cover 5 In the case between the bottom 5a and the electronic component 2, the remaining length 4A of the encoder wire 4 can be moved to the area where the electronic component 2 and the cylindrical portion 5b of the cover 5 face each other by rotating the cover 5 18. Therefore, even if the encoder wire 4 has a surplus length in consideration of the connection workability of the third connector 11, it is not necessary to remove the cylindrical portion of the cover 5 The axial length of is increased according to the wire diameter of the encoder wire 4 clamped between the bottom 5a of the cover 5 and the electronic component 2. As a result, the axial length of the encoder 100-1 can be shortened in accordance with the wire diameter of the encoder wire 4. Furthermore, in Figure 3, the encoder wire 4 is clamped in the gap CL1, but, for example, after the encoder wire 4 is passed through the opening 14 of the cover 5, one side is in the opening 14 of the cover 5. When the second connector 10 is arranged near it while the cover 5 is fitted into the cylindrical portion 8a of the holder 8, the electronic component 2 will not be arranged on the line connecting the second connector 10 and the opening 14. Therefore, when the cover 5 is inserted in this way, not only can the encoder wire 4 be prevented from being caught in the gap CL1, but the remaining length 4A of the encoder wire 4 can be gradually moved by rotating the cover 5 to Area 18.

In addition, in the encoder 100-1 of the first embodiment, a restraining portion 6 is provided in the opening 14. Therefore, it is possible to prevent the encoder wire 4 from moving in the axial direction during the rotation of the cover 5, and to clamp the encoder wire 4 in the gap CL shown in FIG. 1, for example. Therefore, the rotation of the cover 5 becomes smooth, and the assembling workability of the encoder 100-1 is improved. Furthermore, the position of the restraining portion 6 may be a position that restrains the encoder wire 4 from moving in the axial direction. For example, the position in the axial direction of the first end surface 61 of the restraining portion 6 shown in FIG. The position of the second substrate surface 1b of the substrate 1 shown in FIG. 1 in the axial direction is closer to the bracket 8 side. The clearance CL is equal to the radial width between at least a part of the area of the outer peripheral portion 1c of the substrate 1 facing the inner peripheral surface 5b1 of the cylindrical portion 5b and the inner peripheral surface 5b1 of the cylindrical portion 5b facing the area.

In addition, the encoder 100-1 of the first embodiment may be configured such that the gap CL is smaller than the wire diameter of the encoder wire 4. As a result, compared with the case where the clearance CL is larger than the wire diameter of the encoder wire 4, the diameter of the cylindrical portion 5b of the cover 5 can be further reduced, and the radial dimension of the encoder 100-1 can be reduced. .

In addition, by configuring the gap CL to be smaller than the wire diameter of the encoder wire 4, it is possible to suppress the excess length portion 4A of the encoder wire 4 from moving from the gap CL toward the substrate fixing portion 3 side. Therefore, it is possible to prevent the distance from the motor lead wire (not shown) arranged in the vicinity of the board fixing portion 3 to the encoder lead wire 4 from being shortened. Therefore, the noise from the motor wire is unlikely to be superimposed on the encoder wire 4, and the reduction in the detection accuracy of the rotation position of the rotor can be suppressed.

In addition, the cover 5 may be configured as follows. Fig. 7 is a side view of the cover provided in the encoder of the first modification of the first embodiment. The lid body 5 shown in FIG. 7 is provided with a restraining portion 6A instead of the restraining portion 6 shown in FIG. 2. The cover 5 shown in Fig. 7 is configured such that the width W1 from the first end surface 61 on the bottom 5a side of the restraining portion 6A in the axial direction to the bottom 5a is greater than the second substrate 1 in the axial direction. The width W2 from the surface 1b to the bottom 5a is narrower. By using the cover 5 constructed in this way, it is possible to prevent the encoder wire 4 from being caught in the gap CL shown in FIG. 1 during the rotation of the cover 5. Furthermore, for example, in the case where the front end of the protrusion 3c shown in FIG. 1 protrudes more than the second substrate surface 1b, the width from the front end of the protrusion 3c shown in FIG. 1 to the bottom 5a of the cover 5 is set When it is W, as long as the restraining portion 6A and the protrusion 3c are configured such that W and W1 satisfy the relationship of W>W1, it is possible to prevent the encoder wire 4 from catching the protrusion 3c shown in FIG. Therefore, compared with the case where, for example, the position of the first end surface 61 of the restraining portion 6A in the axial direction is closer to the holder 8 than the position of the second substrate surface 1b of the substrate 1 in the axial direction, the rotation of the cover body 5 becomes greater. Smooth, and improve the assembly workability of the encoder 100-1.

Fig. 8 is a side view of the cover provided in the encoder of the second modification of the first embodiment. The lid body 5 shown in FIG. 8 is provided with the restraining portion 6A shown in FIG. 7 and a first protrusion 63 is also provided. The first protrusion 63 refers to a member having a protrusion shape extending in the axial direction from the first end surface 61 of the restraining portion 6A in order to restrain the positional deviation of the encoder wire 4 in the rotation direction. First One protrusion 63 can be manufactured by integrally forming with the suppressing portion 6A, or it can be mounted on the suppressing portion 6A after being separately manufactured from the suppressing portion 6A. The first protrusion 63 only needs to be able to suppress the positional deviation of the encoder wire 4 in the rotation direction, and the shape of the first protrusion 63 is not limited to the shape illustrated in the figure.

[Embodiment 2]

Figure 9 is a perspective view of the encoder according to Embodiment 2 of the present invention. In the encoder 100-2 of the second embodiment, the board fixing portion 3A is used instead of the board fixing portion 3. The substrate fixing part 3A is fixed to the cylindrical part 8a of the holder 8. The cylindrical portion 8a of the holder 8 is formed with a through hole 31 for communicating the inside of the holder 8 with the space inside the cover 5. In addition, a concave portion 32 is formed in the substrate fixing portion 3A. The recessed portion 32 refers to a space in a shape in which a portion of the entire outer peripheral portion 3b of the substrate fixing portion 3A is recessed toward the radially inner side. The recessed portion 32 extends toward the rotation direction of the board fixing portion 3A, and functions as a wiring path through which the motor lead 19 can pass. The motor lead wire 19 penetrates to the through hole 31 of the cylindrical part 8a. One end of the motor lead 19 is connected to a motor not shown, and the other end of the motor lead 19 is connected to a fourth connector 20. The fourth connector 20 is connected to the relay connector 12 shown in FIG. 1. In addition, although illustration is omitted in FIG. 9, the substrate fixing portion 3A is provided with the same protrusion as the protrusion 3c shown in FIG.

When assembling the encoder 100-2 of the second embodiment, first, the substrate 1 is set on the substrate fixing portion 3A, and then the first connector 9 is connected to the second connector 10. Furthermore, one end of the motor lead wire 19 is inserted into the through hole 31 of the cylindrical portion 8a. The third connector 11 and the fourth connector 20 are pulled out from the inner side of the cylindrical portion 5b of the cover 5 through the opening 14 to the outer side of the cylindrical portion 5b of the cover 5. At this time, the motor lead 19 is arranged in the recess 32 of the substrate fixing portion 3A, and is arranged at a position opposite to the side surface of the second end 62 of the restraining portion 6. At the third connector 11 After the fourth connector 20 and the fourth connector 20 are pulled out of the cylindrical portion 5b of the cover 5, the relay connector 12 is connected to the third connector 11 and the fourth connector 20. After that, the cylindrical portion 5b of the lid 5 is fitted into the cylindrical portion 8a. Since the motor lead 19 is arranged in the recess 32 of the substrate fixing part 3A, the cylindrical part 5 b of the cover 5 does not interfere with the motor lead 19. After that, the cover 5 is rotated, and finally the relay connector 12 is fixed to the cylindrical portion 5b of the cover 5.

The encoder 100-2 of the second embodiment is the same as the encoder 100-1 of the first embodiment. Since the cover 5 is rotatably fitted into the substrate fixing portion 3A, the encoder wire 4 has a surplus length. When 4A is sandwiched between the bottom 5a of the cover 5 and the electronic part 2, the remaining length 4A of the encoder wire 4 can be moved to the circle between the electronic part 2 and the cover 5 by rotating the cover 5 The cylindrical portion 5b faces the area 18 facing each other.

Furthermore, in the encoder 100-2 of the second embodiment, since the motor wiring 19 is arranged at a position opposite to the side surface of the second end 62 of the restraining portion 6, it is possible to restrain the motor lead 19 from facing the axial direction while the cover 5 is rotating. mobile. Therefore, it is possible to prevent the motor lead 19 from moving in the axial direction and being caught in the gap CL shown in FIG. 9. As a result, the rotation of the cover 5 becomes smooth, and the assembling workability of the encoder 100-2 is improved.

In addition, according to the encoder 100-2 of the second embodiment, it is possible to prevent each of the encoder lead 4 and the motor lead 19 from moving in the axial direction when the cover 5 rotates while separating the encoder lead 4 and the motor lead 19 in the axial direction. The position offset. Therefore, compared with the case where both the encoder lead wire 4 and the motor lead wire 19 penetrate to the side of the first end surface 61 of the restraining portion 6, for example, the distance from the motor lead wire 19 to the encoder lead wire 4 becomes longer, and the motor lead wire The noise of 19 is not easy to be transmitted to the encoder wire 4. Therefore, it is possible to prevent the detection accuracy of the rotation position of the rotor from being reduced due to noise from the motor wire 19.

Furthermore, the cover 5 of the encoder 100-2 of the second embodiment may be constructed as follows. Figure 10 is a side view of the cover provided in the encoder of the first modification of the second embodiment. The lid 5 shown in FIG. 10 is provided with a restraining portion 6B instead of the restraining portion 6 shown in FIG. 9. The cover 5 shown in Fig. 10 is configured such that the width W3 from the second end surface 62 of the restraining portion 6B in the axial direction to the opening end 5c of the cover 5 is greater than the width W3 of the substrate 1 in the axial direction. The width W4 from the substrate surface 1a to the opening end 5c of the lid body 5 is narrower. By using the cover 5 constructed in this way, it is possible to prevent the motor lead 19 from being caught in the gap CL shown in FIG. 9 during the rotation of the cover 5. Therefore, for example, the rotation of the cover 5 is compared with the case where the axial position of the second end surface 62 of the restraining portion 6B is closer to the bottom 5a side of the cover 5 than the axial position of the first substrate surface 1a of the substrate 1 It becomes smoother, and the assembling workability of the encoder 100-2 is improved.

Furthermore, by using the cover 5 shown in Fig. 10, for example, the position of the second end surface 62 of the restraining portion 6B in the axial direction is closer to the cover 5 than the position of the first substrate surface 1a of the substrate 1 in the axial direction. Compared with the case on the bottom 5a side, the axial distance from the motor lead 19 to the substrate 1 can be expanded. As a result, the axial distance between the motor wire 19 passing through the opening 14 and the encoder wire 4 is expanded, and noise from the motor wire 19 is not easily transmitted to the encoder wire 4. As a result, it is possible to prevent the detection accuracy of the rotation position of the rotor from being reduced due to the noise from the motor wire 19.

In addition, the cover body 5 shown in FIG. 10 is the same as the cover body 5 shown in FIG. 7, and may be comprised so that width W1 may become narrower than width W2. With this structure, the same effect as the cover 5 shown in Fig. 7 can be obtained.

Figure 11 is a side view of the cover provided on the encoder of the second modification of the second embodiment. The cover body 5 shown in Fig. 11 is provided with the restraining portion 6B shown in Fig. 10, and also A first protrusion 63 and a second protrusion 64 are provided. The second protrusion 64 refers to a member having a protrusion shape extending in the axial direction from the second end surface 62 of the restraining portion 6B in order to restrain the positional deviation of the motor lead wire 19 in the rotation direction. The second protrusion 64 may be manufactured by being integrally formed with the suppressing portion 6B, or may be attached to the suppressing portion 6B after being manufactured separately from the suppressing portion 6B. The second protrusion 64 only needs to be able to suppress the positional deviation of the motor lead 19 in the rotation direction, and its shape is not limited to the shape illustrated in the figure.

In the encoders 100-1 and 100-2 of the first and second embodiments, at least one of the encoder lead 4 and the motor lead 19 is connected to the relay connector 12, and is connected to the relay connector 12 via the relay connector 12. The servo amplifier is electrically connected. Therefore, compared with the case where there is no relay connector 12, the wiring length of the encoder lead 4 or the motor lead 19 can be shortened, and the work of passing the encoder lead 4 or the motor lead 19 to the opening 14 can be simplified and shortened. Assembly time of encoder 100-1, 100-2.

[Embodiment 3]

Figure 12 is an external view of the servo motor according to the third embodiment of the present invention. The servo motor 200 shown in FIG. 12 is, for example, a motor used in machine tools such as machining centers, NC lathes, laser processing machines, and electrical discharge machines. The servo motor 200 includes a motor 300 and the encoder 100-1 of the first embodiment. The motor 300 includes a case 301; a bracket 8 provided at the end of the case 301; a rotor (not shown) provided inside the case 301; and a shaft 302 provided on the rotor. Furthermore, in the servo motor 200 of the third embodiment, the encoder 100-2 of the second embodiment may be used instead of the encoder 100-1 of the first embodiment. In Embodiment 3, the encoder 100-1 of Embodiment 1 or the encoder of Embodiment 2 is used. As for the encoder 100-2, the axial length of the cylindrical portion 5b of the cover 5 is shortened, and the overall size of the servo motor 200 can be reduced.

The configuration shown in the above embodiment shows an example of the content of the present invention, which can be combined with other known technologies, and part of the configuration can be omitted or changed without departing from the gist of the present invention.

1‧‧‧Substrate

1a‧‧‧First substrate surface

1b‧‧‧Second substrate surface

1c, 3b, 5d, 8a1‧‧‧peripheral part

1d‧‧‧Notch

2‧‧‧Electronic parts

3‧‧‧Board fixing part

3a‧‧‧End

3c‧‧‧Protrusion

4‧‧‧Encoder wire

5‧‧‧Cover body

5a‧‧‧Bottom

5b、8a‧‧‧Cylinder part

5b1‧‧‧Inner peripheral surface

5c‧‧‧Open end

7‧‧‧Screw

8‧‧‧Support

8b‧‧‧Board Department

9‧‧‧First connector

10‧‧‧Second connector

11‧‧‧Third connector

12‧‧‧Relay connector

13‧‧‧Cable

14‧‧‧Opening

100-1‧‧‧Encoder

AX‧‧‧Central axis

CL‧‧‧Gap

D1‧‧‧Axial

D2‧‧‧Rotation direction

Claims (10)

An assembling method of an encoder, the encoder is provided with: inner parts having a substrate and a cylindrical substrate fixing portion, the substrate is mounted on a second substrate surface with electronic components and a first electrically connected to the electronic components A connector in which the cylindrical substrate fixing portion mounts and fixes the substrate in such a way that the first substrate of the substrate can be surface-contacted; the outer part has a bottomed cylindrical shape with a bottom and a cylindrical portion The cover body is capable of rotating relative to the inner part, the bottom part faces the electronic part through a gap, the cylindrical part is embedded in the outer periphery of the substrate fixing part and an opening is formed; the relay connector is The cover is fixed to the outer peripheral side of the cylindrical portion in a manner to close the opening in the cylindrical portion of the cover; and an encoder wire, one end of which is connected to the first connector, and the other end is passed through the opening The assembly method of the encoder includes the following steps: when the encoder wire is connected to the first connector and the relay connector, the encoder wire is clamped in the gap Next, the step of rotating the outer part relative to the inner part to move the encoder wire from the gap; and after the movement, fixing the cover to the substrate fixing portion. An encoder is provided with: a substrate having a first substrate surface and a second substrate surface opposite to the aforementioned first substrate surface side; The cylindrical substrate fixing portion has an end portion for surface contact with the first substrate, and the substrate is fixed to the end portion; electronic components are provided on the surface of the second substrate; the first connector is It is electrically connected to the aforementioned electronic component and is arranged on the second substrate surface of the aforementioned substrate; a bottomed cylindrical cover has a bottom and a cylindrical portion, the bottom is facing the aforementioned electronic component, and the cylindrical portion is It is rotatably embedded in the outer periphery of the substrate fixing portion and is formed with an opening; the relay connector is fixed to the outer periphery of the cylindrical portion in a manner to close the opening in the cylindrical portion of the cover The encoder wire is electrically connected to the first connector and the relay connector through the opening portion, and transmits a signal indicating the rotation position of the rotor; and the restraining portion is provided in the cylindrical portion, and from The edge of the opening extends in a direction along the rotation direction of the cover to prevent the encoder wire from shifting in the axial direction of the substrate fixing portion. The encoder described in claim 2, wherein at least a part of the area of the outer circumference of the substrate facing the inner circumference of the cylindrical part and the inner circumference of the cylindrical part facing the area The gap between the surfaces is smaller than the wire diameter of the aforementioned encoder wire. The encoder described in claim 2 wherein the width from the first end surface on the bottom side of the restraining portion in the axial direction to the bottom is greater than the width from the second substrate surface in the axial direction The width to the aforementioned bottom is narrower. The encoder described in claim 4, wherein the first end surface is provided with a first protrusion that suppresses the positional deviation of the encoder wire in the rotation direction. According to the encoder described in claim 2, wherein the opening is provided with a motor lead that is provided at a position facing the first substrate and supplies power to the motor through the opening; When the encoder wire and the motor wire are separated in the axial direction, each of the encoder wire and the motor wire is prevented from shifting to the axial position when the cover rotates. The encoder described in claim 6, wherein the width from the second end surface opposite to the first end surface on the bottom side of the restraining portion in the axial direction to the open end of the cylindrical portion , Is narrower than the width from the first substrate surface in the axial direction to the opening end. In the encoder described in claim 7, wherein the second end surface is provided with a second protrusion that suppresses the positional deviation of the motor lead wire in the rotation direction. According to the encoder described in the scope of patent application 2, wherein the cylindrical portion is rotatably embedded in such that the gap between the electronic component and the bottom is smaller than the wire diameter of the encoder wire The outer peripheral portion of the substrate fixing portion. A servo motor is provided with: the encoder described in any one of items 2 to 9 of the scope of patent application; and a motor.

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