CN110832285B - Encoder assembling method, encoder and servo motor - Google Patents

Encoder assembling method, encoder and servo motor Download PDF

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Publication number
CN110832285B
CN110832285B CN201880010281.5A CN201880010281A CN110832285B CN 110832285 B CN110832285 B CN 110832285B CN 201880010281 A CN201880010281 A CN 201880010281A CN 110832285 B CN110832285 B CN 110832285B
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Prior art keywords
encoder
substrate
cover
lead
cylindrical
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CN201880010281.5A
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Chinese (zh)
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CN110832285A (en
Inventor
大熊雅史
金森大辅
二村正范
佐土根俊和
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Mitsubishi Electric Corp
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Mitsubishi Electric Corp
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
    • G01D5/244—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing characteristics of pulses or pulse trains; generating pulses or pulse trains
    • G01D5/24428—Error prevention
    • G01D5/24433—Error prevention by mechanical means
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
    • G01D5/244—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing characteristics of pulses or pulse trains; generating pulses or pulse trains
    • G01D5/245—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing characteristics of pulses or pulse trains; generating pulses or pulse trains using a variable number of pulses in a train

Abstract

The encoder (100-1) is provided with a substrate (1), a substrate fixing part (3), and an encoder lead (4). An encoder (100-1) is provided with: an electronic component (2) provided on the 2 nd substrate surface (1 b); and a bottomed cylindrical cover (5) having a bottom portion (5a) and a cylindrical portion (5b), the bottom portion (5a) facing the electronic component (2), the cylindrical portion (5b) being rotatably fitted in an outer peripheral portion (3b) of the substrate fixing portion (3), and at least an opening portion (14) through which the encoder lead wire (4) passes being formed. The encoder (100-1) is provided with a restraining portion that extends from the edge of the opening (14) in a direction along the rotational direction of the cover (5) and that restrains the encoder lead (4) from being displaced in the axial direction of the substrate fixing portion (3).

Description

Encoder assembling method, encoder and servo motor
Technical Field
The present invention relates to an encoder assembly method for detecting a rotational position of a rotor, an encoder, and a servo motor.
Background
Patent document 1 discloses a technique for realizing miniaturization of an encoder. In the encoder disclosed in patent document 1, in order to miniaturize the encoder, an insulating member is provided in a gap between an inner surface of the cover and an outer peripheral portion of the substrate. The cover is a conductive member formed in a bottomed cylindrical shape covering a substrate provided for the electronic component in order to suppress a decrease in insulation performance due to intrusion of dust, metal pieces, or the like into the encoder. By providing the insulating member, even if the gap between the cylindrical portion of the cover and the substrate is narrowed, an increase in induced voltage generated between the wiring member provided in the cover and the cylindrical portion of the cover is suppressed. Therefore, the size of the encoder in the radial direction can be reduced while suppressing a decrease in the function of the encoder.
Patent document 1: international publication No. 2013/098935
Disclosure of Invention
However, in the encoder disclosed in patent document 1, the encoder lead wire needs to have an extra length in consideration of workability in connecting the encoder lead wire to an external device. Therefore, when the encoder lead is inserted through the opening formed in the cylindrical portion of the cover and the cylindrical portion of the cover is moved so as to approach the motor bracket, the extra length portion of the encoder lead may be caught in a gap between the electronic component disposed at a position facing the bottom portion of the cover and the bottom portion of the cover. When the extra length of the encoder lead wire is held in the gap, the cover cannot be reliably fixed to the motor bracket. Therefore, in the encoder disclosed in patent document 1, in order to prevent the extra length of the encoder lead from being sandwiched between the gaps, the axial length of the cylindrical portion of the cover must be increased by the wire diameter of the encoder lead. As a result, the axial length of the cover becomes long, and there is a problem that further downsizing of the entire encoder cannot be achieved.
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an encoder assembling method, an encoder, and a servo motor that can achieve miniaturization even when an encoder lead wire wired inside a cover has an extra length.
In order to solve the above problems and achieve the object, the present invention relates to a method of assembling an encoder, the encoder including: an inner member having a cylindrical substrate fixing portion on which an electronic component and a1 st connector electrically connected to the electronic component are mounted on a 2 nd substrate surface, the substrate fixing portion mounting and fixing the substrate in contact with the 1 st substrate surface of the substrate; an outer member having a bottomed cylindrical cover having a bottom portion facing the electronic component with the gap therebetween and a cylindrical portion fitted in an outer peripheral portion of the substrate fixing portion and having an opening portion formed therein, the outer member being rotatable with respect to the inner member; a relay connector fixed to an outer peripheral side of the cylindrical portion of the cover so as to close the opening of the cylindrical portion; and an encoder lead wire having one end connected to the 1 st connector and the other end connected to the relay connector via the opening, the method for assembling an encoder including: rotating the outer member relative to the inner member to move the encoder lead from the gap when the encoder lead is held in the gap when the encoder lead is connected to the 1 st connector and the relay connector; and fixing the cover to the substrate fixing portion after the movement.
ADVANTAGEOUS EFFECTS OF INVENTION
The encoder according to the present invention achieves an effect that the encoder can be miniaturized even when an extra length portion exists in an encoder lead wire provided inside a cover.
Drawings
Fig. 1 is a perspective view of an encoder according to embodiment 1 of the present invention.
Fig. 2 is a view showing an opening formed in the cover shown in fig. 1.
FIG. 3 is a view of FIG. 1 showing a state in which an extra length portion of the encoder lead shown in FIG. 1 is moved.
FIG. 4 is a view of FIG. 2 showing a state in which the extra length of the encoder lead wire shown in FIG. 1 is moved.
FIG. 5 is a view of FIG. 3 showing a state in which the extra length of the encoder lead wire shown in FIG. 1 is moved.
FIG. 6 is a view of FIG. 4 showing a state in which the extra length of the encoder lead wire shown in FIG. 1 is moved.
Fig. 7 is a side view of a cover provided in an encoder according to modification 1 of embodiment 1.
Fig. 8 is a side view of a cover provided in an encoder according to modification 2 of embodiment 1.
Fig. 9 is a perspective view of an encoder according to embodiment 2 of the present invention.
Fig. 10 is a side view of a cover provided in an encoder according to modification 1 of embodiment 2.
Fig. 11 is a side view of a cover provided in an encoder according to modification 2 of embodiment 2.
Fig. 12 is an external view of a servo motor according to embodiment 3 of the present invention.
Detailed Description
Hereinafter, an encoder assembling method, an encoder, and a servo motor according to embodiments of the present invention will be described in detail with reference to the drawings. The present invention is not limited to the present embodiment.
Embodiment 1.
Fig. 1 is a perspective view of an encoder according to embodiment 1 of the present invention. Fig. 2 is a view showing an opening formed in the cover shown in fig. 1. The encoder 100-1 according to embodiment 1 includes: a substrate 1 having a1 st substrate surface 1a and a 2 nd substrate surface 1b on the opposite side of the 1 st substrate surface 1 a; an electronic component 2 provided on the 2 nd substrate surface 1 b; a cylindrical substrate fixing portion 3 having an end portion 3a in contact with the 1 st substrate surface 1a, for fixing the substrate 1 to the end portion 3 a; and an encoder lead 4 provided at a position facing the 2 nd substrate surface 1b, electrically connected to the substrate 1, and transmitting a signal indicating a rotational position of the rotor. Further, the encoder 100-1 includes: a bottomed cylindrical cover 5 having a cylindrical portion 5b and a bottom portion 5a opposed to the electronic component 2, the cylindrical portion 5b being rotatably fitted into an outer peripheral portion 8a1 of the cylindrical portion 8a of the bracket 8 so that a gap between the electronic component 2 and the bottom portion 5a becomes smaller than a wire diameter of the encoder lead 4, and at least an opening portion through which the encoder lead 4 passes is formed; and a suppressing portion 6 provided in the cylindrical portion 5b and suppressing axial displacement of the encoder lead 4 with respect to the substrate fixing portion 3.
The axial direction extending from the center axis AX passing through the radial center of the substrate fixing portion 3 is the same as the direction indicated by reference numeral D1 in fig. 1 and 2. The direction of rotation of the hood 5 is the same as that shown by reference D2 in figures 1 and 2.
The substrate fixing portion 3 is detachably fixed to an axial end portion of the cylindrical portion 8a of the bracket 8 using a screw 7. The bracket 8 includes a plate-like plate portion 8b that closes an axial end portion of the motor case, not shown, and a cylindrical portion 8a provided on an end surface of the plate portion 8b on the substrate fixing portion 3 side. The cylindrical portion 8a may be made of an insulating material and formed integrally with the plate portion 8 b. Examples of the insulating material include butadiene terephthalate, polyphenylene sulfide, and liquid crystal polymer. The bracket 8 is manufactured by die casting using an insulating resin, whereby the bracket 8 having a complicated shape can be manufactured at low cost. The outer diameter of the cylindrical portion 8a of the bracket 8 is larger than the outer diameter of the substrate fixing portion 3 and is substantially equal to the inner diameter of the cylindrical portion 5b of the cover 5. The substrate fixing portion 3 is manufactured separately from the cylindrical portion 8a of the bracket 8 using the insulating material and then attached to the bracket 8, but may be manufactured integrally with the cylindrical portion 8a of the bracket 8 using an insulating material. By manufacturing the substrate fixing portion 3 by press casting using the insulating resin, the substrate fixing portion 3 having a complicated shape can be manufactured at low cost. In the present embodiment, a configuration example in which the substrate fixing portion 3 is manufactured separately from the cylindrical portion 8a of the bracket 8 is described, but in the case where the substrate fixing portion 3 is manufactured integrally with the cylindrical portion 8a of the bracket 8, the entire substrate fixing portion 3 and the cylindrical portion 8a manufactured integrally may be the substrate fixing portion 3 or the bracket 8.
A projection 3c is formed on the substrate fixing portion 3. The projection 3c is a convex member extending in the axial direction from the end 3a of the substrate fixing portion 3. The boss 3c is formed at a corner portion formed by the end portion 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 is the end of the substrate fixing portion 3 on the side opposite to the bracket 8 side. In fig. 1, only 1 projection 3c is shown for the sake of simplifying the explanation, but a plurality of projections 3c may be provided and the plurality of projections 3c may be arranged so as to be separated from each other in the rotational direction. The illustration of the projection 3c is omitted in fig. 2. The projection 3c is fitted into a recess 1d formed radially outward of the substrate 1. The recess 1d is a concave portion having a convex shape from the outer peripheral portion 1c of the substrate 1 toward the radial center of the substrate 1. An adhesive agent not shown is provided between the projections 3c and the recesses 1 d. By providing the adhesive, the contact area between the recess 1d and the projection 3c of the substrate 1 is increased, and the substrate 1 is firmly fixed to the substrate fixing portion 3, as compared with the case where the adhesive is not provided.
The length of the projection 3c in the axial direction is only required to be long enough to hold the substrate 1, but for example, the tip of the projection 3c may be extended by a dimension corresponding to the thickness of the substrate 1 in the axial direction so as to protrude from the 2 nd substrate surface 1 b. Thus, when the cover 5 is rotated, for example, a motor lead not shown, which is wired radially outward of the boss 3c, approaches the substrate 1, and the influence of noise from the motor lead on the electronic component 2, the position detection unit, and the like provided on the substrate 1 can be suppressed. Therefore, by lengthening the projection 3c, it is possible to suppress a decrease in the detection accuracy of the rotational position of the rotor. The motor lead is a wire for supplying electric power to a motor not shown.
The electronic component 2 may be a component that generates a signal indicating the rotational position of the rotor detected by the position detecting portion, and a signal output circuit that outputs the signal to the encoder lead wire 4, or a component that constitutes a power supply circuit that supplies power supplied from a servo amplifier provided outside the encoder 100-1 to the position detecting portion, for example. The electronic component 2 is, for example, an ic (integrated circuit), a resistor, a coil, a capacitor, or the like. The number of the electronic components 2 may be 1. In fig. 1 and 2, for the sake of simplicity of explanation, the electronic component 2 is simulated by a cylindrical structure. The position detector is an optical component that detects the rotational position of the rotor, not shown, and is provided on the 1 st substrate surface 1a of the substrate 1, for example, inside the substrate fixing portion 3. The 1 st substrate surface 1a is an end surface of the substrate 1 facing the substrate fixing portion 3.
On the 2 nd substrate surface 1b of the substrate 1, a1 st connector 9 is provided in addition to the electronic component 2. The 2 nd substrate surface 1b is an end surface of the substrate 1 facing the bottom 5a of the cover 5. The 1 st connector 9 is electrically connected to the electronic component 2 and the position detection unit via pattern wiring on the substrate 1. The 2 nd connector 10 is connected to the 1 st connector 9. One end of the encoder lead wire 4 is connected to the 2 nd connector 10. The encoder lead 4 is electrically connected to the electronic component 2 and the position detecting portion by connecting the 2 nd connector 10 to the 1 st connector 9. By using the 1 st connector 9 and the 2 nd connector 10, the connection of the encoder lead 4 to the substrate 1 is facilitated. The encoder lead 4 may be electrically connected to the electronic component 2, or may be directly connected to the wiring pattern on the substrate 1 by, for example, soldering without using the 1 st connector 9 and the 2 nd connector 10. In fig. 1 and 2, 1 encoder lead 4 is shown for simplicity of explanation, but the encoder lead 4 is a signal group including a plurality of signal lines.
The 3 rd connector 11 is connected to the other end of the encoder lead wire 4. The 3 rd connector 11 is connected to the relay connector 12. The relay connector 12 is a connector for connecting the encoder lead wire 4 and a motor lead wire, not shown, to a servo amplifier provided outside the encoder 100-1. The 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 cover 5 so as to close the opening 14 formed in the cylindrical portion 5b of the cover 5. The opening 14 will be described in detail later. Further, the relay connector 12 is connected to a motor lead wire in addition to the 2 nd connector 10.
The cover 5 is a member for suppressing a decrease in insulation performance due to intrusion of dust, metal pieces, and the like into the encoder 100-1. The cover 5 may be formed into a cylindrical shape by press molding using the above-described insulating material, or may be formed into a cylindrical shape by press molding using a metal such as a copper alloy, cast iron, steel, or iron alloy. By making the cover 5 of metal, the electronic circuit present inside the cover 5 is protected from the magnetic field outside the cover 5.
An O-ring, not shown, for example, is provided 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 bracket 8. When the cover 5 is fitted into the cylindrical portion 8a of the bracket 8, the gap between the cylindrical portion 8a of the bracket 8 and the cover 5 is closed by the O-ring, and therefore, entry of dust, metal pieces, and the like into the cover 5 can be suppressed. As shown in fig. 2, a flange portion 5e extending radially outward from an outer peripheral portion 5d of the cylindrical portion 5b of the cover 5 is formed on the opening end 5c side of the cover 5. The cover 5 is fixed to the bracket 8 by screwing the screw 7 from the flange portion 5e toward the plate portion 8b of the bracket 8.
An opening 14 is formed in the cylindrical portion 5b of the cover 5, and the suppression portion 6 is provided in the opening 14. The suppressing portion 6 is a member for suppressing the displacement of the encoder lead 4 in the axial direction when the cover 5 rotates. The suppression portion 6 may be manufactured integrally with the cover 5, or may be manufactured separately from the cover 5. In the case of using the suppression portion 6 manufactured separately from the cover 5, the suppression portion 6 is fixed to the wall surface 15 constituting the opening 14 by bonding or the like.
The suppression portion 6 extends from the 1 st wall surface 151 in the rotation direction of the cover 5 toward the 2 nd wall surface 152 facing the 1 st wall surface 151 among the wall surfaces 15 constituting the opening 14. That is, the suppression portion 6 extends from the edge of the opening 14 in the direction along the rotation direction of the cover 5. By providing the suppression portion 6 on the 1 st wall surface 151, the 1 st space 16 in a dimple shape is formed between the 3 rd wall surface 153 on the bottom portion 5a side of the cover 5 and the 1 st end surface 61 of the suppression portion 6 opposed to the 3 rd wall surface 153, among the wall surfaces 15 constituting the opening 14. The width of the 1 st space 16 in the axial direction is wider than the wire diameter of the encoder lead 4. Since the encoder lead 4 is formed of a plurality of signal lines as described above, the wire diameter of the encoder lead 4 can be made as thick as a signal line group in which a plurality of signal lines are bundled.
Further, by providing the suppression portion 6 on the 1 st wall surface 151, the 2 nd space 17 through which the motor lead wire, not shown, passes is formed between the 4 th wall surface 154 located on the opening end 5c side of the cover 5 and the 2 nd end surface 62 of the suppression portion 6 opposed to the 4 th wall surface 154, among the wall surfaces 15 constituting the opening portion 14.
In assembling the encoder 100-1, the substrate 1 is first set on the substrate fixing portion 3, and then the 1 st connector 9 is connected to the 2 nd connector 10. After the 1 st connector 9 is connected to the 2 nd connector 10, the 3 rd connector 11 provided on the encoder lead 4 is pulled out from the inside of the cylindrical portion 5b of the cover 5 to the outside of the cylindrical portion 5b of the cover 5 through the opening portion 14. After the 3 rd connector 11 is pulled out to the outside of the cylindrical portion 5b of the cover 5, the relay connector 12 is connected to the 3 rd connector 11.
In this way, the encoder lead wire 4 needs to have an extra length in consideration of the workability of connection of the 3 rd connector 11 to the relay connector 12. However, when the encoder lead 4 is made to have an extra length, when the cylindrical portion 5b of the cover 5 is fitted into the cylindrical portion 8a of the bracket 8, the extra length of the encoder lead 4 may be pinched in the gap between the bottom portion 5a of the cover 5 and the electronic component 2. Since the encoder 100-1 according to embodiment 1 has a structure in which the cover 5 is rotatably fitted into the cylindrical portion 8a of the bracket 8, even when the extra length portion of the encoder lead 4 is sandwiched between the bottom portion 5a of the cover 5 and the electronic component 2 when the cylindrical portion 5b of the cover 5 is fitted into the cylindrical portion 8a of the bracket 8, the extra length portion of the encoder lead 4 can be moved to a region other than the gap between the bottom portion 5a of the cover 5 and the electronic component 2, that is, a region in which the electronic component 2 and the cylindrical portion 5b of the cover 5 face each other, in the space in the cover 5, by rotating the cover 5 while pressing the cylindrical portion 5b of the cover 5 toward the plate portion 8b of the bracket 8.
Next, a case where the extra length of the encoder lead wire 4 moves when the encoder 100-1 is assembled will be described. FIG. 3 is a view of FIG. 1 showing a state in which an extra length portion of the encoder lead shown in FIG. 1 is moved. FIG. 4 is a view of FIG. 2 showing a state in which the extra length of the encoder lead wire shown in FIG. 1 is moved. FIG. 5 is a view of FIG. 3 showing a state in which the extra length of the encoder lead wire shown in FIG. 1 is moved. FIG. 6 is a view of FIG. 4 showing a state in which the extra length of the encoder lead wire shown in FIG. 1 is moved.
Fig. 3 shows a state in which the extra length 4A of the encoder lead 4 is held in the clearance CL1 between the bottom 5a of the cover 5 and the electronic component 2. The extra length portion 4A is, for example, an intermediate portion in a range from one end of the encoder lead 4 to the other end.
Fig. 4 shows a state of the encoder lead wire 4 when the cover 5 to which the relay connector 12 is fixed is rotated clockwise while the cylindrical portion 5b is pressed against the plate portion 8b of the bracket 8. The extra length portion 4A of the encoder lead wire 4 rubs against the bottom portion 5a of the cover 5 shown in fig. 1 in association with the rotation of the cylindrical portion 5b of the cover 5, thereby moving from the gap CL1 between the bottom portion 5a of the cover 5 and the electronic component 2 toward the region 18 where the electronic component 2 and the cylindrical portion 5b of the cover 5 oppose each other.
If the cover 5 is further rotated clockwise from the state shown in fig. 4, the extra length portion 4A of the encoder lead wire 4 is pulled out from the gap CL1 between the bottom portion 5a of the cover 5 and the electronic component 2 to the region 18 where the electronic component 2 and the cylindrical portion 5b of the cover 5 oppose each other, as shown in fig. 5.
When the cover 5 is rotated counterclockwise from the state shown in fig. 5, the extra length portion 4A of the encoder lead 4 is pulled and wiring is performed in the region 18 where the electronic component 2 and the cylindrical portion 5b of the cover 5 face each other as shown in fig. 6.
As described above, since the encoder 100-1 according to embodiment 1 has a structure in which the cover 5 is rotatably fitted into the cylindrical portion 8a of the bracket 8, even when the extra-long portion 4A of the encoder lead 4 is sandwiched between the bottom portion 5a of the cover 5 and the electronic component 2, the extra-long portion 4A of the encoder lead 4 can be moved to the region 18 in which the electronic component 2 and the cylindrical portion 5b of the cover 5 face each other by rotating the cover 5. Therefore, even when the encoder lead 4 is made to have extra length in consideration of the connection workability of the 3 rd connector 11, it is not necessary to lengthen the axial length of the cylindrical portion of the cover 5 by the wire diameter of the encoder lead 4 sandwiched between the bottom portion 5a of the cover 5 and the electronic component 2. As a result, the length of the encoder 100-1 in the axial direction can be reduced by the wire diameter of the encoder lead wire 4. In fig. 3, the encoder lead wire 4 is held in the clearance CL1, but for example, when the 2 nd connector 10 is disposed near the opening 14 of the cover 5 and the cover 5 is fitted into the cylindrical portion 8a of the bracket 8 after the encoder lead wire 4 is inserted through the opening 14 of the cover 5, the electronic component 2 is not disposed on a line connecting the 2 nd connector 10 and the opening 14. Therefore, when the cover 5 is fitted in this manner, the excess length portion 4A of the encoder lead 4 can be prevented from being caught in the clearance CL1, and the cover 5 is further rotated, whereby the excess length portion 4A of the encoder lead 4 can be caused to climb over the region 18.
In the encoder 100-1 according to embodiment 1, the suppression unit 6 is provided in the opening 14. Therefore, the encoder lead 4 moves in the axial direction during the rotation of the cover 5, and the encoder lead 4 can be prevented from being pinched in the clearance 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. The position of the suppressing portion 6 may be any position as long as it can suppress the encoder lead 4 from moving in the axial direction, and for example, the position in the axial direction of the 1 st end surface 61 of the suppressing portion 6 shown in fig. 2 may be closer to the bracket 8 side than the position in the axial direction of the 2 nd substrate surface 1b of the substrate 1 shown in fig. 1. The clearance CL is equal to a radial width between a region of at least a part of the outer peripheral portion 1c of the substrate 1 opposed to the inner peripheral surface 5b1 of the cylindrical portion 5b and the inner peripheral surface 5b1 of the cylindrical portion 5b opposed to the region.
The encoder 100-1 according to embodiment 1 may be configured such that the clearance CL is smaller than the wire diameter of the encoder lead wire 4. Accordingly, as compared with the case where the clearance CL is larger than the wire diameter of the encoder lead 4, the diameter of the cylindrical portion 5b of the cover 5 can be reduced, and the size of the encoder 100-1 in the radial direction can be reduced.
Further, by configuring the clearance CL to be smaller than the wire diameter of the encoder lead 4, the extra length portion 4A of the encoder lead 4 can be suppressed from moving from the clearance CL toward the substrate fixing portion 3. Therefore, the distance from the not-shown motor lead wire wired in the vicinity of the substrate fixing portion 3 to the encoder lead wire 4 can be suppressed from becoming short. Therefore, noise from the motor lead is less likely to overlap the encoder lead 4, and a decrease in the detection accuracy of the rotational position of the rotor can be suppressed.
The cover 5 may be configured as follows. Fig. 7 is a side view of a cover provided in an encoder according to modification 1 of embodiment 1. The cover 5 shown in fig. 7 is provided with a suppression portion 6A instead of the suppression portion 6 shown in fig. 2. The cover 5 shown in fig. 7 is configured such that the width W1 from the 1 st end surface 61 on the bottom portion 5a side of the suppression portion 6A to the bottom portion 5a in the axial direction is narrower than the width W2 from the 2 nd substrate surface 1b to the bottom portion 5a of the substrate 1 in the axial direction. By using the cover 5 configured in this manner, the encoder lead 4 can be prevented from being pinched in the clearance CL shown in fig. 1 during rotation of the cover 5. Further, for example, when the tip of the boss 3c shown in fig. 1 protrudes beyond the 2 nd substrate surface 1b, if the width from the tip of the boss 3c shown in fig. 1 to the bottom 5a of the cover 5 is assumed to be W, if the suppression part 6A and the boss 3c are configured such that W and W1 satisfy the relationship W > W1, it is possible to prevent the encoder lead 4 from being caught in the boss 3c shown in fig. 1. Therefore, for example, as compared with a case where the position in the axial direction of the 1 st end surface 61 of the suppression portion 6A is on the bracket 8 side with respect to the position in the axial direction of the 2 nd substrate surface 1b of the substrate 1, the rotation of the cover 5 becomes smooth, and the assembling workability of the encoder 100-1 is improved.
Fig. 8 is a side view of a cover provided in an encoder according to modification 2 of embodiment 1. The cover 5 shown in fig. 8 is provided with the suppression portion 6A of fig. 7, and is also provided with the 1 st projection 63. The 1 st projection 63 is a convex member extending in the axial direction from the 1 st end surface 61 of the suppressing portion 6A in order to suppress displacement of the encoder lead 4 in the rotational direction. The 1 st projection 63 may be manufactured integrally with the suppression portion 6A, or may be attached to the suppression portion 6A after being manufactured separately from the suppression portion 6A. The shape of the 1 st projection 63 is not limited to the shape illustrated in the drawings, as long as the 1 st projection 63 can suppress displacement of the encoder lead 4 in the rotational direction.
Embodiment 2.
Fig. 9 is a perspective view of an encoder according to embodiment 2 of the present invention. In the encoder 100-2 according to embodiment 2, the substrate fixing portion 3A is used instead of the substrate fixing portion 3. The substrate fixing portion 3A is fixed to the cylindrical portion 8a of the bracket 8. A through hole 31 is formed in the cylindrical portion 8a of the bracket 8 to communicate the interior of the bracket 8 with the space inside the cover 5. In addition, a concave portion 32 is formed in the substrate fixing portion 3A. The concave portion 32 is a space having a shape in which a partial region of the entire outer peripheral portion 3b of the substrate fixing portion 3A is recessed inward in the radial direction. The recess 32 extends in the rotational direction of the substrate fixing portion 3A and functions as a wiring path through which the motor lead 19 passes. The motor lead wire 19 passes through the through hole 31 of the cylindrical portion 8 a. One end of the motor lead wire 19 is connected to a motor not shown, and the 4 th connector 20 is connected to the other end of the motor lead wire 19. The 4 th connector 20 is connected to the relay connector 12 shown in fig. 1. Note that, although not shown in fig. 9, a projection similar to the projection 3c shown in fig. 1 may be provided on the substrate fixing portion 3A.
When the encoder 100-2 according to embodiment 2 is assembled, the substrate 1 is first provided on the substrate fixing portion 3A, and then the 1 st connector 9 is connected to the 2 nd connector 10. One end of the motor lead wire 19 is inserted into the through hole 31 of the cylindrical portion 8 a. The 3 rd connector 11 and the 4 th connector 20 are pulled out from the inside of the cylindrical portion 5b of the cover 5 to the outside of the cylindrical portion 5b of the cover 5 through the opening portion 14. At this time, the motor lead 19 is wired in the recess 32 of the substrate fixing portion 3A and is wired at a position facing the 2 nd end surface 62 side of the suppression portion 6. After the 3 rd connector 11 and the 4 th connector 20 are pulled out of the cylindrical portion 5b of the cover 5, the relay connector 12 is connected to the 3 rd connector 11 and the 4 th connector 20. Then, the cylindrical portion 5b of the cover 5 is fitted into the cylindrical portion 8 a. Since the motor lead 19 is wired in the recess 32 of the substrate fixing portion 3A, the cylindrical portion 5b of the cover 5 does not interfere with the motor lead 19. Then, the cover 5 is rotated, and finally the relay connector 12 is fixed to the cylindrical portion 5b of the cover 5.
Similarly to the encoder 100-1 according to embodiment 1, the encoder 100-2 according to embodiment 2 has a structure in which the cover 5 is rotatably fitted to the substrate fixing portion 3A, and therefore, even when the extra-length portion 4A of the encoder lead 4 is sandwiched between the bottom portion 5a of the cover 5 and the electronic component 2, the extra-length portion 4A of the encoder lead 4 can be moved to the region 18 in which the electronic component 2 and the cylindrical portion 5b of the cover 5 face each other by rotating the cover 5.
In the encoder 100-2 according to embodiment 2, the motor lead 19 is wired at a position facing the 2 nd end surface 62 side of the suppression unit 6, and therefore, the motor lead 19 can be suppressed from moving in the axial direction during rotation of the cover 5. Therefore, the motor lead 19 can be prevented from moving in the axial direction and being sandwiched between the clearances 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.
Further, according to the encoder 100-2 of embodiment 2, the encoder lead wire 4 and the motor lead wire 19 can be separated in the axial direction, and the displacement of the encoder lead wire 4 and the motor lead wire 19 in the respective axial directions when the cover 5 rotates can be suppressed. Therefore, compared to the case where both the encoder lead wire 4 and the motor lead wire 19 are inserted from the 1 st end surface 61 side of the suppression unit 6, for example, the distance from the motor lead wire 19 to the encoder lead wire 4 becomes longer, and noise from the motor lead wire 19 is less likely to be transmitted to the encoder lead wire 4. Therefore, it is possible to prevent the detection accuracy of the rotational position of the rotor from being lowered due to noise from the motor lead wire 19.
The cover 5 of the encoder 100-2 according to embodiment 2 may be configured as follows. Fig. 10 is a side view of a cover provided in an encoder according to modification 1 of embodiment 2. The cover 5 shown in fig. 10 is provided with a suppression portion 6B instead of the suppression portion 6 shown in fig. 9. The cover 5 shown in fig. 10 is configured such that a width W3 from the 2 nd end surface 62 of the suppression portion 6B to the opening end 5c of the cover 5 in the axial direction is narrower than a width W4 from the 1 st substrate surface 1a of the substrate 1 to the opening end 5c of the cover 5 in the axial direction. By using the cover 5 configured in this manner, it is possible to suppress the motor lead 19 from being pinched in the clearance CL shown in fig. 9 during rotation of the cover 5. Therefore, for example, as compared with a case where the position in the axial direction of the 2 nd end surface 62 of the suppression portion 6B is on the bottom portion 5a side of the cover 5 with respect to the position in the axial direction of the 1 st substrate surface 1a of the substrate 1, the rotation of the cover 5 becomes smooth, and the assembling workability of the encoder 100-2 is improved.
Further, by using the cover 5 shown in fig. 10, for example, the distance in the axial direction from the motor lead 19 to the substrate 1 can be increased as compared with a case where the position in the axial direction of the 2 nd end surface 62 of the suppression portion 6B is on the bottom portion 5a side of the cover 5 as compared with the position in the axial direction of the 1 st substrate surface 1a of the substrate 1. Therefore, the axial distance between the motor lead wire 19 and the encoder lead wire 4 passing through the opening 14 is increased, and noise from the motor lead wire 19 is less likely to be transmitted to the encoder lead wire 4. As a result, it is possible to prevent the accuracy of detecting the rotational position of the rotor from being lowered by the noise from the motor lead wire 19.
The cover 5 shown in fig. 10 may be configured such that the width W1 is narrower than the width W2, similarly to the cover 5 shown in fig. 7. By configuring in this manner, the same effect as the cover 5 shown in fig. 7 is obtained.
Fig. 11 is a side view of a cover provided in an encoder according to modification 2 of embodiment 2. The cover 5 shown in fig. 11 is provided with the suppression portion 6B shown in fig. 10, and further provided with a1 st projection 63 and a 2 nd projection 64. The 2 nd projection 64 is a convex member extending in the axial direction from the 2 nd end surface 62 of the suppression portion 6B in order to suppress displacement of the motor lead 19 in the rotational direction. The 2 nd projection 64 may be manufactured integrally with the suppression portion 6B, or may be attached to the suppression portion 6B after being manufactured separately from the suppression portion 6B. The shape of the 2 nd projection 64 is not limited to the shape illustrated in the drawings as long as it can suppress displacement of the motor lead 19 in the rotational direction.
In the encoders 100-1 and 100-2 according to embodiments 1 and 2, at least one of the encoder lead wire 4 and the motor lead wire 19 is connected to the relay connector 12, and is electrically connected to the servo amplifier via the relay connector 12. Therefore, compared to the case where the relay connector 12 is not provided, the wiring length of the encoder lead 4 or the motor lead 19 can be shortened, the work of inserting the encoder lead 4 or the motor lead 19 through the opening 14 can be facilitated, and the assembly time of the encoders 100-1 and 100-2 can be shortened.
Embodiment 3.
Fig. 12 is an external view of a servo motor according to embodiment 3 of the present invention. The servo motor 200 shown in fig. 12 is a motor used for a machine tool such as an automatic tool changing numerical control machine tool, an NC lathe, a laser beam machine, and an electric discharge machine, for example. The servo motor 200 includes a motor 300 and the encoder 100-1 according to embodiment 1. The motor 300 includes a housing 301, a bracket 8 provided at an end of the housing 301, a rotor, not shown, provided inside the housing 301, and a shaft 302 provided on the rotor. In addition, in the servo motor 200 according to embodiment 3, the encoder 100-2 according to embodiment 2 may be used instead of the encoder 100-1 according to embodiment 1. In embodiment 3, since the encoder 100-1 of embodiment 1 or the encoder 100-2 of embodiment 2 is used, the axial length of the cylindrical portion 5b of the cover 5 is shortened, and the entire servo motor 200 can be further downsized.
The configuration described in the above embodiment is an example of the content of the present invention, and may be combined with other known techniques, and a part of the configuration may be omitted or modified without departing from the scope of the present invention.
Description of the reference numerals
1 substrate, 1a 1 st substrate surface, 1B 2 nd substrate surface, 1c, 3B, 8a1 peripheral portion, 1d pit, 2 electronic component, 3A substrate fixing portion, 3A end portion, 3c bump, 4 encoder lead, 4A excess length portion, 5 cover, 5a bottom portion, 5B, 8a cylindrical portion, 5B1 inner peripheral surface, 5c open end, 5e flange portion, 6A, 6B suppression portion, 7 screw, 8 bracket, 8B plate portion, 9 st 1 connector, 10 nd 2 connector, 11 rd 3 connector, 12 relay connector, 13 cable, 14 opening portion, 15 wall surface, 16 st 1 space, 17 nd 2 space, 18 region, 19 motor lead, 20 th 4 connector, 31 through hole, 32 recess, 61 st 1 end surface, 62 nd 2 end surface, 63 st 1 bump, 64 nd 2 bump, 100-1, 100-2, encoder 151 th wall surface, 152 nd wall 2, 153 rd wall 3, 154 th wall 4, 200 servo motor, 300 motor, 301 housing, 302 shaft.

Claims (10)

1. An encoder assembly method, the encoder comprising:
an inner member having a cylindrical substrate fixing portion on which an electronic component and a1 st connector electrically connected to the electronic component are mounted on a 2 nd substrate surface, the substrate fixing portion mounting and fixing the substrate in contact with the 1 st substrate surface of the substrate;
an outer member having a bottomed cylindrical cover having a bottom portion facing the electronic component with a gap therebetween and a cylindrical portion fitted in an outer peripheral portion of the substrate fixing portion and having an opening portion formed therein, the outer member being rotatable with respect to the inner member;
a relay connector fixed to an outer peripheral side of the cylindrical portion of the cover so as to close the opening of the cylindrical portion; and
an encoder lead having one end connected to the 1 st connector and the other end connected to the relay connector via the opening,
the method for assembling the encoder includes the steps of:
rotating the outer member relative to the inner member to move the encoder lead from the gap when the encoder lead is held in the gap when the encoder lead is connected to the 1 st connector and the relay connector; and
after the moving, the cover is fixed to the substrate fixing portion.
2. An encoder, comprising:
a substrate having a1 st substrate surface and a 2 nd substrate surface opposite to the 1 st substrate surface;
a cylindrical substrate fixing portion having an end portion in surface contact with the 1 st substrate, the substrate fixing portion fixing the substrate to the end portion;
an electronic component provided on the 2 nd substrate surface;
a1 st connector electrically connected to the electronic component and provided on a 2 nd substrate surface of the substrate;
a bottomed cylindrical cover having a cylindrical portion rotatably fitted in an outer peripheral portion of the substrate fixing portion and having an opening portion, and a bottom portion facing the electronic component;
a relay connector fixed to an outer peripheral side of the cylindrical portion of the cover so as to close the opening of the cylindrical portion;
an encoder lead wire for electrically connecting the 1 st connector and the relay connector via the opening and transmitting a signal indicating a rotational position of the rotor; and
and a suppressing portion provided in the cylindrical portion, extending from an edge of the opening portion in a direction along a rotation direction of the cover, and suppressing a displacement of the encoder lead in an axial direction of the substrate fixing portion.
3. The encoder according to claim 2,
a gap between a region of at least a part of the outer peripheral portion of the substrate facing the inner peripheral surface of the cylindrical portion and the inner peripheral surface of the cylindrical portion facing the region is smaller than a wire diameter of the encoder lead.
4. The encoder according to claim 2,
the width from the 1 st end surface on one side of the bottom portion of the suppression portion to the bottom portion in the axial direction is narrower than the width from the 2 nd substrate surface to the bottom portion in the axial direction.
5. The encoder according to claim 4,
the 1 st end surface is provided with a1 st projection, and the 1 st projection suppresses the misalignment of the encoder lead in the rotation direction.
6. The encoder according to claim 2,
a motor lead wire which is provided at a position facing the 1 st substrate surface and supplies electric power to the motor is inserted through the opening,
the suppressing unit separates the encoder lead wire and the motor lead wire in the axial direction and suppresses displacement of the encoder lead wire and the motor lead wire in the axial direction when the cover rotates.
7. The encoder according to claim 6,
the width from the 2 nd end surface of the suppression portion opposite to the 1 st end surface on the side of the bottom portion to the opening end of the cylindrical portion in the axial direction is narrower than the width from the 1 st substrate surface to the opening end in the axial direction.
8. The encoder according to claim 7,
a 2 nd projection is provided on the 2 nd end surface, and the 2 nd projection suppresses misalignment of the motor lead in the rotational direction.
9. The encoder according to claim 2,
the cylindrical portion is rotatably fitted in an outer peripheral portion of the substrate fixing portion such that a gap between the electronic component and the bottom portion becomes smaller than a wire diameter of the encoder lead.
10. A servo motor is characterized in that a servo motor is provided,
an encoder and a motor according to any one of claims 2 to 9 are provided.
CN201880010281.5A 2018-06-13 2018-06-13 Encoder assembling method, encoder and servo motor Active CN110832285B (en)

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JPWO2019239508A1 (en) 2020-06-25
KR20200066586A (en) 2020-06-10
CN110832285A (en) 2020-02-21
TW202001195A (en) 2020-01-01
TWI707124B (en) 2020-10-11
WO2019239508A1 (en) 2019-12-19
KR102157817B1 (en) 2020-09-18

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