JP2010276403A - Motor system with encoder, encoder, and method for manufacturing motor system with encoder - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To attain a motor system with an encoder which is excellent in productivity and facilitates replacement or repair of the encoder, keeps the encoder part small-sized, and makes the accuracy of the encoder part in acceleration of a motor little lower. <P>SOLUTION: The motor system with the encoder includes a code disk and a joining member in the central part of which a mounting hole wherein a rotary shaft is inserted is formed, and which is adhered to the disk surface of the code disk with an adhesive. A film of a low-melting metal is provided at least on the sidewall part of the mounting hole. The inner diameter of the mounting hole before the film of the low-melting metal is formed is larger than the outer diameter of the rotary shaft of the motor being inserted, while the inner diameter of the mounting hole after the film of the low-melting metal is formed is smaller than the outer diameter of the rotary shaft of the inserted motor. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a motor system with an encoder applied in a servo motor and the like and an encoder used in this system.

As a servo motor, etc., a motor system with a rotary encoder (denoted as an encoder-equipped motor) equipped with a rotary encoder (denoted as an encoder), which is a detector that optically and magnetically detects the rotational speed of the motor, is used. Yes.
For example, a motor system with an encoder using an optical encoder includes a motor and an optical encoder attached to the rotation shaft of the motor. The optical encoder includes a disk-shaped code disk provided with a pattern that modulates the intensity of light corresponding to rotation, a light projecting unit that projects light onto the pattern part of the code disk, and a light projecting unit A light receiving portion that receives the light that is incident on and reflected by the pattern portion, and an attachment portion that attaches the code disk to the rotating shaft of the motor.

Further, there are three types of motor systems with an encoder, which are different in the structure for attaching the code disk to the rotating shaft of the motor.
The first motor system with an encoder has a structure in which a mounting portion is formed integrally with a disk portion corresponding to a code disk, and a rotating shaft of the motor is inserted into the mounting portion and fixed with an adhesive. Yes (see, for example, Patent Document 1).
Further, in the second motor system with an encoder, the mounting portion is composed of a first core metal and a second core metal that are fixed with a rotating disk corresponding to a code disk interposed therebetween. The screw shaft is screwed into the female screw hole provided in the side wall portion of the metal core, and the rotation shaft of the motor inserted through the center hole of the second metal core is fixed (for example, Patent Document 2). reference).
The third encoder-equipped motor system has a structure in which the attachment portion is fixed to the rotation shaft of the motor by press-fitting or shrink fitting.

Japanese Unexamined Patent Publication No. 2004-108984 (4th page, 5th page, FIG. 1) Japanese Patent Laid-Open No. 08-205479 (page 3, FIG. 6)

However, in the first motor system with an encoder described in Patent Document 1, since the attachment portion integrated with the code disk is fixed to the rotation shaft of the motor with an adhesive, it is difficult to remove the code disk from the rotation shaft of the motor. There was a problem that it was difficult to replace or repair the code disk.
In addition, foreign matters such as cutting oil and rust preventive oil may adhere to the rotating shaft of the motor in the motor assembly process, and such foreign matter causes poor bonding between the code disk and the rotating shaft of the motor, There was a problem that the production yield of the motor system with an encoder was lowered.

In the second motor system with an encoder described in Patent Document 2, since the attachment portion coupled to the code disk is fixed to the rotating shaft of the motor with a screw, the code disk can be easily replaced or repaired. In addition, the fixing strength of the screw fixing is not easily affected by foreign matter adhering to the motor rotation shaft.
However, in order to obtain a sufficient fixing strength, it is necessary to increase the dimensions such as the diameter and length of the tube screw used for fixing. As the size of the female screw increases, the female screw into which the female screw fits becomes larger, and it is necessary to enlarge the second metal core provided with the female screw.

Increasing the size of the connecting member constituting the mounting portion increases the inertia, causing a problem that the rotational axis of the motor is twisted during acceleration of the motor and the angular accuracy of the encoder is lowered. Further, there is a problem that it is necessary to increase the fastening force between the rotating shaft of the motor and the coupling member in response to the inertia.
Further, the increase in size of the coupling member has a problem that the dimension of the coupling member in the direction of the rotation axis of the motor becomes longer and the length of the encoder in the axial direction becomes longer.
In addition, since the screw tightening process is difficult to automate, there is a problem that it is difficult to improve the productivity of the assembly of the motor system with an encoder.

  In the third motor system with an encoder, it is necessary to insert a jig on the motor side of the mounting portion and to pull out the encoder from the rotating shaft of the motor on the side opposite to the motor when replacing the encoder. For this reason, it is necessary to provide a space for inserting a jig between the encoder unit and the motor, and there is a problem that the axial dimension of the motor system with an encoder becomes long and miniaturization is difficult.

  The present invention has been made to solve the above-described problems, and its purpose is to provide excellent productivity and easy replacement and repair of the encoder, as well as a small encoder section and acceleration of the motor. To provide an encoder-equipped motor system and an encoder used in the encoder-equipped motor system with less accuracy deterioration at the time.

  The encoder according to the present invention has a code disk having a modulation pattern on the disk surface and having a through hole into which the rotation shaft is inserted at the center, and an attachment hole into which the rotation shaft is inserted at the center. And a coupling member bonded to the disk surface of the code disk with an adhesive, a light projecting unit that projects light onto the modulation pattern, and a light receiving unit that receives the light projected from the light projecting unit and reflected by the modulation pattern The low melting point metal film is provided at least on the side wall of the mounting hole, and the inner diameter of the mounting hole before the low melting point metal film is formed is larger than the outer diameter of the rotating shaft to be inserted, The inner diameter of the mounting hole after the low melting point metal film is formed is smaller than the outer diameter of the rotating shaft to be inserted.

  The encoder according to the present invention has a code disk having a modulation pattern on the disk surface and having a through-hole into which the rotation shaft is inserted at the center, and an attachment hole into which the rotation shaft is inserted at the center. A coupling member formed by bonding a low melting point metal layer to a disk surface opposite to a disk surface on which a modulation pattern of a code disk is provided, a light projecting unit that projects light onto the modulation pattern, and a light projecting unit And a light receiving unit that receives light reflected by the modulation pattern.

  The encoder according to the present invention includes a coupling member in which a non-penetrating mounting hole into which a rotating shaft is inserted is formed on one surface, and a concave portion is provided on a surface facing the surface on which the mounting hole is formed. Mounted on the reflective surface side of the mirror, a mirror having a parabolic reflecting surface installed in the concave portion of the member, an adhesive that bonds the bottom surface of the concave portion of the coupling member and the surface facing the reflective surface of the mirror Code disk, a light projecting unit that is installed at the focal position of the reflective surface, transmits the code disk and projects light onto the reflective surface, and a disk surface that is reflected by the reflective surface and is on the light projecting unit side of the code disk An encoder including a light receiving portion that receives light that passes through the modulation pattern provided on the mounting hole, and a low melting point metal film is provided on at least the side wall of the mounting hole, and the attachment hole before the low melting point metal film is formed The inner diameter of the Larger than the outer diameter of the shaft, the inner diameter of the mounting hole after film formation of the low melting point metal, is smaller than the outer diameter of the rotary shaft to be inserted.

  The encoder according to the present invention includes a disk-shaped coupling member having a non-through mounting hole into which a rotating shaft is inserted on one surface, and a magnetic member provided on a side surface of the circumferential portion of the coupling member. An encoder including a code disk and a magnetic sensor disposed opposite to a magnetic member at a predetermined interval, wherein a low melting point metal film is provided on at least a side wall portion of the mounting hole, The inner diameter of the mounting hole before forming the melting point metal film is larger than the outer diameter of the rotating shaft to be inserted, and the inner diameter of the mounting hole after forming the film of the low melting point metal is smaller than the outer diameter of the rotating shaft to be inserted. is there.

  The motor system with an encoder according to the present invention is a motor system with an encoder in which the encoder and the motor according to the present invention are coupled, and the rotation shaft of the motor is inserted and fixed at least in a mounting hole of a coupling member in the encoder. It is a thing.

  The motor system with an encoder according to the present invention is a motor system with an encoder in which the encoder and the motor according to the present invention are coupled, and at least the rotation of the encoder inserted and fixed in the mounting hole of the coupling member in the encoder. A rotating shaft of a motor is coupled to a shaft by a joint.

  A method of manufacturing a motor system with an encoder according to the present invention includes a step of preparing a code disk provided with a modulation pattern composed of a reflective portion and a non-reflective portion by forming a thin film of chromium or the like by vapor deposition, and is attached to a central portion. A step of preparing a coupling member having a hole, a step of plating the surface of the coupling member to form a low melting point metal film on the surface of the coupling member, and a mounting hole of the coupling member on which the low melting point metal film is formed There are provided a step of coupling the rotating shaft of the motor by press-fitting or shrink-fitting using an automatic machine, a step of arranging an adhesive on the coupling member, a coupling member provided with the adhesive, and a modulation pattern. The step of laminating the code disk, the step of curing the adhesive and bonding the coupling member and the code disk, and the step of arranging the light projecting part and the light receiving part at predetermined positions are performed in order. Than is.

  The method of manufacturing a motor system with an encoder according to the present invention includes a step of preparing a coupling member that is a code disk body having a mounting hole in the center, and a magnetic member is applied and fixed to the side surface of the circumferential portion of the coupling member. A step of forming a low melting point metal film on the bonding member coated with the magnetic member by plating, and removing the low melting point metal film on the magnetic member by polishing to obtain surface accuracy and trueness of the outer periphery of the magnetic member. A step of improving the circularity to form a code disc, a step of coupling the mounting hole of the coupling member forming the code disc and the rotating shaft of the motor by press-fitting or shrink-fitting using an automatic machine, and a predetermined position The steps of arranging the magnetic sensors are sequentially performed.

  The encoder according to the present invention has a code disk in which a through-hole into which a rotating shaft is inserted at the center and an attachment hole into which the rotating shaft is inserted at the center, and is bonded to the disk surface of the code disk. An encoder having a bonding member bonded with an agent, wherein a low melting point metal film is provided on at least the side wall of the mounting hole, and the inner diameter of the mounting hole before the low melting point metal film is formed is inserted The inner diameter of the mounting hole after formation of the low melting point metal film is larger than the outer diameter of the shaft, and smaller than the outer diameter of the rotating shaft to be inserted. Repairability and angular accuracy of a motor system with an encoder using this encoder And can be reduced in size.

  The encoder according to the present invention includes a code disk in which a through hole into which a rotation shaft is inserted is formed at the center, a mounting hole into which the rotation shaft is inserted at the center, and a low melting point metal in the code disk. And a joining member joined by layers, the code disk can be easily replaced, and the repairability is excellent.

  The encoder according to the present invention includes a coupling member in which a non-penetrating mounting hole into which a rotating shaft is inserted is formed on one surface, and a concave portion is provided on a surface facing the surface on which the mounting hole is formed. An encoder comprising a mirror having a reflective surface installed in a concave portion of a member, an adhesive for adhering the mirror to the concave portion of a coupling member, and a code disk placed on the reflective surface side of the mirror, and at least attached A low melting point metal film is provided on the side wall of the hole, and the inner diameter of the attachment hole before the formation of the low melting point metal film is larger than the outer diameter of the rotating shaft to be inserted. The inner diameter is smaller than the outer diameter of the rotating shaft to be inserted, so that the repairability and angular accuracy of the motor system with an encoder using this encoder can be improved, and further miniaturization can be achieved.

  The encoder according to the present invention includes a disk-shaped coupling member having a non-through mounting hole into which a rotating shaft is inserted on one surface, and a magnetic member provided on a side surface of the circumferential portion of the coupling member. An encoder provided with a coded disk, wherein a low melting point metal film is provided at least on the side wall of the mounting hole, and the inner diameter of the mounting hole before forming the low melting point metal film is the outer diameter of the rotating shaft to be inserted The inner diameter of the mounting hole after the film formation of the larger and lower melting point metal is smaller than the outer diameter of the rotating shaft to be inserted, and the repairability and angular accuracy of the motor system with an encoder using this encoder can be improved. At the same time, the cost can be reduced.

  The motor system with an encoder according to the present invention is a motor system with an encoder in which the encoder and the motor according to the present invention are coupled, and the rotation shaft of the motor is inserted and fixed at least in a mounting hole of a coupling member in the encoder. It is excellent in repairability, has high angular accuracy, and can be downsized.

  The motor system with an encoder according to the present invention is a motor system with an encoder in which the encoder and the motor according to the present invention are coupled, and at least the rotation of the encoder inserted and fixed in the mounting hole of the coupling member in the encoder. The shaft and the rotating shaft of the motor are coupled by a joint, and the encoder can be incorporated into various motor systems.

  A method of manufacturing a motor system with an encoder according to the present invention includes a step of preparing a code disk provided with a modulation pattern composed of a reflective portion and a non-reflective portion by forming a thin film of chromium or the like by vapor deposition, and is attached to a central portion. A step of preparing a coupling member having a hole, a step of plating the surface of the coupling member to form a low melting point metal film on the surface of the coupling member, and a mounting hole of the coupling member on which the low melting point metal film is formed There are provided a step of coupling the rotating shaft of the motor by press-fitting or shrink-fitting using an automatic machine, a step of arranging an adhesive on the coupling member, a coupling member provided with the adhesive, and a modulation pattern. The step of laminating the code disk, the step of curing the adhesive and bonding the coupling member and the code disk, and the step of arranging the light projecting part and the light receiving part at predetermined positions are performed in order. And than, it is excellent in productivity, easy to repair property can be obtained motor system with an encoder that can be miniaturized.

  The method of manufacturing a motor system with an encoder according to the present invention includes a step of preparing a coupling member that is a code disk body having a mounting hole in the center, and a magnetic member is applied and fixed to the side surface of the circumferential portion of the coupling member. A step of forming a low melting point metal film on the bonding member coated with the magnetic member by plating, and removing the low melting point metal film on the magnetic member by polishing to obtain surface accuracy and trueness of the outer periphery of the magnetic member. A step of improving the circularity to form a code disc, a step of coupling the mounting hole of the coupling member forming the code disc and the rotating shaft of the motor by press-fitting or shrink-fitting using an automatic machine, and a predetermined position The process of arranging the magnetic sensors in order is carried out in order, and it is possible to obtain a motor system with an encoder that is excellent in productivity, easy to repair, and can be downsized. .

It is a front section schematic diagram of the motor system with an encoder concerning Embodiment 1 of the present invention. It is a front cross-sectional schematic diagram of the motor system with an encoder concerning Embodiment 2 of this invention. It is a front cross-sectional schematic diagram of the motor system with an encoder concerning Embodiment 3 of this invention. It is a front cross-sectional schematic diagram of the motor system with an encoder concerning Embodiment 4 of this invention. It is a front cross-sectional schematic diagram of the motor system with an encoder concerning Embodiment 5 of this invention. It is a front cross-sectional schematic diagram of the motor system with an encoder concerning Embodiment 6 of this invention. It is a front cross-sectional schematic diagram of the motor system with an encoder concerning Embodiment 7 of this invention.

Embodiment 1 FIG.
FIG. 1 is a schematic front sectional view of an encoder-equipped motor system according to Embodiment 1 of the present invention.
As shown in FIG. 1, an encoder-equipped motor system 100 according to the present embodiment includes an encoder 101 and a motor 1.
The encoder 101 according to the present embodiment has a through hole formed in the center and a code disk 5 having a modulation pattern 8 on one disk surface, and an attachment hole penetrating in the center. The light intensity is modulated by the coupling member 3 bonded to the disk surface opposite to the surface on which the pattern 8 is provided with the adhesive 9, the light projecting unit 6 that projects light onto the modulation pattern 8, and the modulation pattern 8. It is an optical encoder provided with the light-receiving part 7 which receives the reflected light reflected.
Further, the coupling member 3 is arranged so that its mounting hole is concentric with the through hole of the code disk 5, and the low melting point metal film 2 is provided on the inner wall surface of the mounting hole of the coupling member 3. Yes.
The motor 1 includes a motor main body 1a and a motor rotation shaft 1b. The motor rotation shaft 1b is inserted into a mounting hole of the coupling member 3 of the encoder 101 to constitute a motor system 100 with an encoder.

In the present embodiment, the light projecting unit 6 is configured by an LD (Laser Diode) or an LED (Light Emitting Diode), and the light receiving unit 7 is configured by a PD (Photo Diode) or the like.
The code disk 5 is a disk made of resin or glass, and the modulation pattern 8 provided on the surface is composed of a reflective part on which a thin film such as chromium is deposited and a non-reflective part that transmits or absorbs light. Thus, only the light reflected by the reflecting portion enters the light receiving portion 7.

The coupling member 3 has a low melting point metal film 2 formed on the surface thereof, and a recess for holding the adhesive 9 is provided on the side to be bonded to the code disk 5.
The inner diameter of the attachment hole of the coupling member 3 before forming the low melting point metal film 2 is slightly larger than the outer diameter of the rotating shaft 1b of the motor to be inserted, thereby forming the low melting point metal film 2. After that, the inner diameter of the mounting hole of the coupling member 3 is slightly smaller than the outer diameter of the rotating shaft 1b of the motor to be inserted. The clearance between the mounting hole of the coupling member 3 before the low melting point metal film 2 is provided and the rotating shaft 1b of the motor is 10 to 200 μm, and the coupling member 3 is mounted after the low melting point metal film 2 is formed. The inner diameter of the hole is slightly smaller than the outer diameter of the rotating shaft 1b of the motor to be inserted, but is a dimension that allows the rotating shaft 1b of the motor to be press-fitted.
For example, copper or brass is used for the coupling member 3, and solder plating is used for the low melting point metal film 2, for example. When copper or brass is used for the coupling member 3, since these have excellent solder wettability, solder plating is easy, and the low melting point metal film 2 can be easily formed. Moreover, tin plating can also be used for the low melting point metal film 2.
As the adhesive 9 used in the present embodiment, a photocurable adhesive is preferable.

Next, an example of a manufacturing method of the encoder-equipped motor system 100 according to the first embodiment of the present invention will be described.
First, a code disk 5 provided with a modulation pattern 8 composed of a reflective portion and a non-reflective portion is prepared by forming a thin film of chromium or the like by vapor deposition.
Next, the coupling member 3 having a mounting hole at the center is prepared.
Next, a low melting point metal film 2 is formed on the surface of the coupling member 3 by plating the surface of the coupling member 3. The thickness of the low melting point metal film 2 is set such that the inner diameter of the attachment hole of the coupling member 3 is slightly smaller than the outer diameter of the rotating shaft 1b.
Next, the mounting hole of the coupling member 3 on which the low melting point metal film 2 is formed and the rotating shaft 1b of the motor are coupled by press fitting or shrink fitting using an automatic machine.
Next, the adhesive 9 is disposed on the coupling member 3.
Next, the coupling member 3 provided with the adhesive 9 and the code disk 5 provided with the modulation pattern 8 are laminated.
Next, the adhesive 9 is cured to bond the coupling member 3 and the code disk 5 together.
Finally, a light projecting unit and a light receiving unit are arranged at predetermined positions to manufacture a motor system with an encoder.

The encoder 101 of the present embodiment can use a resin or glass disk for the code disk 5, can use copper or brass for the coupling member 3, and can solder the low melting point metal film 2 with solder plating. Since tin plating can be used, the encoder can be formed with a member that can be obtained easily and inexpensively.
Further, in the motor system 100 with an encoder according to the present embodiment, an eccentricity adjustment is performed in which the center of the rotation shaft 1b of the motor, that is, the rotation center and the center of the modulation pattern 8 are aligned. Since the coupling member 3 and the code disk 5 are bonded with the adhesive 9 after the eccentricity adjustment, it is necessary to fix the coupling member 3 and the code disk 5 until the adhesive 9 is cured after the eccentricity adjustment. There is. In the present embodiment, when a photocurable adhesive is used as the adhesive 9, the time for fixing the coupling member 3 and the code disk 5 can be shortened, and the assembly of the motor system 100 with an encoder can be easily automated. Become.
Further, since the concave portion for storing the adhesive 9 is provided on the joint surface of the coupling member 3 with the code disk 5, the bonding strength between the coupling member 3 and the code disk 5 is large, and the adhesion reliability is improved.

Further, in the motor system 100 with an encoder according to the present embodiment, the rotating shaft 1b of the motor is inserted into the attachment hole of the coupling member 3 provided with the low melting point metal film 2 on the inner wall surface by press fitting or shrink fitting. Yes. And since the outer diameter of the rotating shaft 1b of a motor is smaller than the internal diameter of the attachment hole in the coupling member 3 before the low melting-point metal membrane | film | coat 2 is provided, for example, it heats with an industrial dryer and the low-melting-point metal membrane | film | coat 2 , The code disk 5 and the coupling member 3 can be easily detached from the rotating shaft 1b of the motor.
That is, the encoder-equipped motor system 100 of the present embodiment is easy to replace the encoder and has excellent repairability.
Further, when solder plating is used for the low melting point metal film 2, if the motor rotating shaft 1 is made of stainless steel having poor solder wettability, it is possible to prevent the solder from remaining on the motor rotating shaft 1b after melting. The accuracy of press fitting and shrink fitting at the time of reassembly is improved.
In addition, since the motor system 100 with an encoder according to the present embodiment does not use screwing for joining the rotating shaft 1b of the motor and the encoder 101, the motor system 100 with an encoder is excellent in productivity, It is possible to reduce the size and prevent a decrease in the angular accuracy of the encoder.

Embodiment 2. FIG.
FIG. 2 is a schematic front sectional view of an encoder-equipped motor system according to Embodiment 2 of the present invention.
As shown in FIG. 2, the encoder-equipped motor system 200 according to the present embodiment also includes an encoder 201 and a motor (a motor body is not shown).
The encoder 201 of the present embodiment has a modulation pattern 82 composed of a flat portion and a non-flat portion on which a metal film is deposited on one surface, and a code disc in which a boss 4 is formed in a central through hole portion 52 and a boss 4 of the code disk 52 are formed with a stepped portion that fits with the boss 4, and a coupling member 32 having a mounting hole penetrating in the center, and the coupling member 32 is connected to the code disk 52. The adhesive 9 that adheres to the surface of the disk opposite to the surface on which the modulation pattern 82 is provided, the light projecting unit 6 that projects light onto the modulation pattern 82, and the light intensity is modulated by the modulation pattern 82 and reflected. It is an optical encoder provided with the light-receiving part 7 which receives reflected light.
The low melting point metal film 2 is provided on the inner wall surface of the attachment hole of the coupling member 32.

Also in the encoder 201 of the present embodiment, the inner diameter of the attachment hole of the coupling member 32 before forming the low melting point metal film 2 is slightly larger than the outer diameter of the rotating shaft 1b of the motor to be inserted. The inner diameter of the attachment hole of the coupling member 32 after forming the film 2 is slightly smaller than the outer diameter of the rotating shaft 1b of the motor to be inserted.
The code disk 52 provided with the boss 4 is integrally formed by resin molding, and the boss 4 protrudes from the disk surface of the code disk 52 in the thickness direction. The inner diameter of the through hole formed in the portion of the boss 4 is slightly smaller than the rotating shaft 1b of the motor to be inserted, but has a dimension that allows the rotating shaft 1b of the motor to be press-fitted.
Further, the flat portion and the non-flat portion constituting the modulation pattern 82 provided on one surface of the code disk 52 are also formed when the code disk 52 having the boss 4 is molded with resin.

In the motor system 200 with an encoder according to the present embodiment, the boss 4 is formed in the through hole portion of the code disk 52. Therefore, when the coupling member 32 and the code disk 52 are bonded, the adhesive 9 is used as the rotation shaft of the motor. It is possible to prevent wrapping around 1b.
Further, in the motor system with encoder 200 of the present embodiment, the rotating shaft 1b of the motor that is inserted through the attachment hole of the coupling member 32 is press-fitted into the through hole formed in the boss 4 portion of the code disk 52.
Since the inner diameter of the through hole of the code disk 52 is slightly smaller than the outer diameter of the rotating shaft 1b of the motor, the center of the rotating shaft 1b of the motor can be obtained simply by fitting the code disk 52 to the rotating shaft 1b. And the center of the modulation pattern 82 can be aligned, and eccentricity adjustment is not necessary. In particular, the concentricity between the center of the inner diameter of the boss 4 and the center of the modulation pattern 82 can be improved by assembling the mold with high accuracy.

  Similarly to the first embodiment, the motor system 200 with an encoder according to the present embodiment has a fitting hole of the coupling member 32 in which the low melting point metal film 2 is formed on the inner wall surface and the motor rotating shaft 1b. It is fixed with shrink fit. Since the inner diameter of the attachment hole of the coupling member 32 before forming the low melting point metal film 2 is slightly larger than the outer diameter of the rotating shaft 1b of the motor, the low melting point metal film is heated with an industrial dryer or the like. When 2 is melted, the code disk 52 and the coupling member 32 can be easily detached from the rotating shaft 1b of the motor, and the encoder-equipped motor system 200 of the present embodiment can be easily replaced and repaired. Is excellent. In this embodiment, the rotating shaft 1b of the motor is press-fitted into the through hole of the code disk 52. However, the code disk 52 is a resin molded product, and the coefficient of thermal expansion of the rotating shaft 1b of the motor is metal. Since it is larger than the expansion coefficient, the code disk 52 can be easily detached from the rotating shaft 1b of the motor by heating.

The motor system with an encoder according to the present embodiment also has excellent productivity and can be miniaturized because no screwing is used to fix the coupling member 32 to the rotating shaft 1b of the motor. It is possible to prevent a decrease in angular accuracy.
In particular, if the coupling member 32 is made of a light metal such as aluminum, the inertia when the motor is accelerated can be further reduced, the accuracy of the encoder can be prevented from being lowered when the motor is accelerated, and the rotating shaft 1b of the motor of the fixed member 32 can be prevented. The fastening force to can also be reduced.
Examples of the low-melting-point metal film 2 used in the aluminum bonding member include aluminum solder.

Embodiment 3 FIG.
FIG. 3 is a schematic front sectional view of the motor system with an encoder according to the third embodiment of the present invention.
As shown in FIG. 3, the encoder-equipped motor system 300 according to the present embodiment is also composed of an encoder 301 and a motor (the motor body is not shown).
The encoder 301 according to the present embodiment has a modulation pattern 83 composed of a flat portion and a non-flat portion with a metal film deposited on one surface, and a code disc in which a boss 4 is formed in a central through-hole portion. 53 and a boss 4 of the code disk 53 are formed with a stepped portion to be fitted with the boss 4, a coupling member 33 having a mounting hole penetrating in the center, and the coupling member 33 of the code disk 53. The adhesive 9 that adheres to the disk surface provided with the modulation pattern 83, the light projecting unit 6 that projects light onto the modulation pattern 83, and the reflected light that is reflected after the light intensity is modulated by the modulation pattern 83 is received. The light receiving unit 7 is provided with a magnetic sensor 12 disposed above the coupling member 33 at a predetermined interval with respect to the surface of the coupling member 33 that faces the bonding surface of the coupling member 33 with the code disk 53. The low melting point metal film 2 is provided on the inner wall surface of the attachment hole of the coupling member 33.

  In the encoder 301 of the present embodiment, the coupling member 33 is formed of a magnet member, the magnetic sensor 12 can read the magnetic field of the coupling member 33, and also functions as a magnetic encoder. That is, the encoder 301 according to the present embodiment optically reads the modulation pattern 83 to detect the position within one rotation, and detects the change in the magnetic field of the coupling member 33 accompanying the rotation, whereby the rotation speed of the motor 1 is detected. It is an encoder using both optical and magnetic methods.

Also in the encoder 301 of the present embodiment, the inner diameter of the attachment hole of the coupling member 33 before the low melting point metal film 2 is provided is slightly larger than the outer diameter of the rotating shaft 1b of the motor to be inserted. The inner diameter of the attachment hole of the coupling member 33 after the coating 2 is provided is slightly smaller than the outer diameter of the rotating shaft 1b of the motor to be inserted.
The code disk 53 including the boss 4 is integrally formed by resin molding, and the boss 4 protrudes from the disk surface of the code disk 53 in the thickness direction. The inner diameter of the through hole formed in the portion of the boss 4 is slightly smaller than the rotating shaft 1b of the motor to be inserted, but has a dimension that allows the rotating shaft 1b of the motor to be press-fitted.

That is, in the motor system 300 with an encoder of the present embodiment, since the code disk 53 is the same as that of the second embodiment, the code disk 53 is simply fitted onto the motor rotation shaft 1b, and the motor rotation shaft 1b The center and the center of the modulation pattern 83 can be aligned, making it unnecessary to adjust the eccentricity and preventing the adhesive 9 from turning around the rotating shaft 1b of the motor.
Further, in the motor system 300 with an encoder of the present embodiment, the motor rotating shaft 41 is fixed to the coupling member 33 having the above structure by press-fitting, and the code disk 53 is a resin molded product. When heating to a temperature at which the low melting point metal film 2 melts, the code disk 53 and the coupling member 33 are easily detached from the rotating shaft 1b of the motor, the code disk can be easily replaced, and the repairability is excellent. Yes.
In addition, the motor system with an encoder according to the present embodiment is excellent in productivity and can be reduced in size because screwing is not used to fix the coupling member 33 to the rotating shaft 1b of the motor. Therefore, it is possible to prevent a decrease in the angular accuracy of the encoder.
In addition, a magnetic member that is easily broken is used for the coupling member 33. However, since the coupling member 33 is fixed to the rotating shaft 1b of the motor via the low melting point metal film 2, the coupling member 33 is subjected to stress applied thereto. It is relaxed and hard to break. Incidentally, the low melting point metal film 2 is formed by plating.

Embodiment 4 FIG.
FIG. 4 is a schematic front sectional view of a motor system with an encoder according to Embodiment 4 of the present invention.
As shown in FIG. 4, the motor system 400 with an encoder of the present embodiment is also composed of an encoder 401 and a motor (a motor body is not shown).
The encoder 401 of the present embodiment has a code disk 54 having a modulation pattern 84 on one disk surface and a through hole formed in the center, an attachment hole penetrating in the center, and a code The coupling member 34 provided on the disk surface side facing the surface on which the modulation pattern 84 of the disk 54 is provided, the low melting point metal layer 24 that joins the code disk 54 and the coupling member 34, and the modulation pattern 84 with light. Is an optical encoder that includes a light projecting unit 6 that projects light and a light receiving unit 7 that receives reflected light that is reflected after the light intensity is modulated by the modulation pattern 84.

In the motor system 400 with an encoder according to the present embodiment, the modulation pattern 84 of the code disk 54 is formed by depositing an aluminum layer as a reflective material on the metal code disk 54 and forming a chromium layer as a non-reflective material thereon. Vapor deposition is performed, and then the chromium layer is etched to form an aluminum reflecting portion and a chromium non-reflecting portion.
The code disk 54 is applied to the disk surface opposite to the surface on which the modulation pattern 84 is formed, and then externally fitted to the rotating shaft 1b of the motor extending from the attachment hole of the coupling member 34. The surface coated with solder is brought into contact with the coupling member 34. Then, the code disk 54 is heated in contact with the coupling member 34 to melt the cream solder, and the code disk 54 and the coupling member 34 are joined by the low melting point metal layer 24.
The rotation shaft 1b of the motor is press-fitted into the mounting hole of the coupling member 34. The inner diameter of the through hole of the code disk 54 matches the outer diameter of the rotating shaft 1b of the motor, and the rotating shaft 1b of the motor can be easily inserted into the through hole of the code disk 54 without a gap.

When the motor system 400 with an encoder of the present embodiment is also heated to a temperature at which the low melting point metal layer 24 is melted with an industrial dryer or the like, the code disk 54 can be easily detached from the rotating shaft 1b of the motor. It is easy to replace and has excellent repairability.
In the present embodiment, only the code disk 54 is removed from the rotating shaft 1b of the motor, so that the coupling member 34 can be reused. In addition, even if the low melting point metal layer 24 remains on the coupling member 34 side after the code disk 54 is removed, the remaining low melting point metal layer 24 is melted by heating at the time of reassembly. There will be no inconvenience.
In addition, the motor system 400 with an encoder according to the present embodiment is excellent in productivity and can be reduced in size because no screwing is used for joining the rotating shaft 1b of the motor and the encoder 401. A decrease in the angular accuracy of the encoder can be prevented.

Embodiment 5 FIG.
FIG. 5 is a schematic front sectional view of a motor system with an encoder according to the fifth embodiment of the present invention.
As shown in FIG. 5, the motor system 500 with an encoder according to the present embodiment also includes an encoder 501 and a motor (a motor body is not shown).
In the encoder 501 of the present embodiment, a non-penetrating attachment hole into which the rotating shaft 1b of the motor is inserted is formed on one surface, and a recess is formed on a surface opposite to the surface on which the attachment hole is formed. The coupling member 35, the mirror 10 that is held in the recess of the coupling member 35 and has a parabolic reflection surface, the adhesive 9 that bonds the coupling member 35 and the mirror 10, and the reflection surface side of the mirror 10 A code disk 55 placed and having a modulation pattern 85 and a focal position of a parabolic reflecting surface, which transmits light through the code disk 55 and projects light onto the reflecting surface of the mirror 10, for example, an LED. An optical encoder that includes a light projecting unit 6 and a light receiving unit 7 that is, for example, a PD that receives light reflected by the mirror 10 and transmitted through the modulation pattern 85. The low melting point metal film 2 is provided on the inner wall surface of the attachment hole of the coupling member 35.

In the encoder 501 of the present embodiment, the code disk 55 is formed of glass or transparent resin that transmits light, and a modulation pattern formed by etching a metal such as chrome on the surface facing the light receiving portion 7. 85 is provided.
The mirror 10 is also formed of glass or resin, and a metal vapor deposition film is provided on the parabolic surface thereof to serve as a reflecting surface. In addition, a projection is provided on the surface of the mirror 10 on the side of the coupling member 35, and the adhesive 9 is disposed in a gap between the mirror 10 and the bottom surface of the concave portion of the coupling member 35 formed by the projection. Has been. The mirror 10 is bonded to the coupling member 35 by the adhesive 9. As the adhesive 9, it is preferable to use a photocurable adhesive.

Also in the encoder 501 of the present embodiment, the inner diameter of the attachment hole of the coupling member 35 before the low melting point metal film 2 is provided is larger than the outer diameter of the rotary shaft 1b of the press-fitted motor. The inner diameter of the mounting hole of the coupling member 35 provided with 2 is smaller than the outer diameter of the rotating shaft 1b of the motor.
The encoder-equipped motor system 500 of the present embodiment is also formed by press-fitting the motor rotating shaft 1b into the mounting hole of the coupling member 53 of the encoder 501, and coupling the encoder 501 and the motor.
Therefore, when the low melting point metal film 2 is melted by heating with an industrial dryer or the like, the motor rotating shaft 1b is easily detached from the coupling member 35 of the encoder 500. That is, the encoder-equipped motor system 500 of the present embodiment is also easy to replace the encoder and has excellent repairability.

Further, the encoder-equipped motor system 500 according to the present embodiment can determine the axial positions of the mirror 10 and the code disk 55 by adjusting the press-fitting depth of the rotating shaft 1b of the motor.
Further, since the mirror 10 is inserted into the concave portion of the coupling member 35, it is easy to align the center of the mirror 10 and the center of the rotating shaft 1b of the motor.
Further, since the center side of the code disk is effectively used, the diameter of the code disk can be reduced and the encoder can be reduced in size.
In addition, since screwing is not used for joining the rotating shaft 1b of the motor and the encoder 501, the productivity is excellent, the size can be reduced, and the angular accuracy of the encoder can be prevented from being lowered.

Embodiment 6 FIG.
FIG. 6 is a schematic front sectional view of a motor system with an encoder according to the sixth embodiment of the present invention.
As shown in FIG. 6, the motor system 600 with an encoder according to the present embodiment also includes an encoder 601 and a motor (a motor body is not shown).
The encoder 601 of the present embodiment includes a code disk 56 in which a magnetic member 16 is provided on a circumferential side surface of a coupling member 36 having a non-through hole into which the rotating shaft 1b of the motor is inserted on one surface. The magnetic sensor 12 is provided so as to be opposed to the magnetic member 16 of the code disk 56 at a predetermined interval. The magnetic sensor 12 reads a magnetic field that changes according to the rotation angle, thereby detecting the rotation speed. This is a magnetic encoder. A low melting point metal film 2 is provided on the inner wall surface of the non-through hole of the coupling member 36.

In the motor system with an encoder 600 of the present embodiment, the non-through hole formed in the coupling member 36 constituting the code disk main body is a mounting hole for attaching the rotating shaft 1b of the motor. The inner diameter of the mounting hole before the low melting point metal film 2 is provided is slightly larger than the outer diameter of the rotating shaft 1b of the motor, and the inner diameter of the mounting hole after the low melting point metal film 2 is provided is It is slightly smaller than the outer diameter of the motor rotating shaft 1b, and the coupling member 36 and the motor rotating shaft 1b are fixed by press-fitting.
Since the motor system 600 with an encoder according to the present embodiment has the above-described structure, when the low melting point metal film 2 is heated to a temperature at which the low melting point metal film 2 is melted by an industrial dryer or the like, the code disk 56 is removed from the rotating shaft 1b of the motor. It can be easily removed, the code disk can be easily replaced, and it has excellent repairability.
Further, in the motor system 600 with an encoder according to the present embodiment, screwing is not used for joining the rotating shaft 1b of the motor and the encoder 601, and the coupling member 36 is a code disk main body. Therefore, it is excellent in productivity, and the encoder 601 can be made thinner, further miniaturization is possible, and further reduction in encoder angular accuracy can be prevented.

A method of manufacturing the encoder-equipped motor system 600 according to the present embodiment will be described.
First, the coupling member 36 which is a code disk body having a mounting hole at the center is prepared.
Next, the magnetic member 16 is applied and fixed to the circumferential side surface of the coupling member 36.
Next, the low melting point metal film 2 is formed on the coupling member 36 to which the magnetic member 16 is applied by plating.
Next, the low melting point metal film 2 on the magnetic member 16 is removed by polishing to improve the surface accuracy and roundness of the outer periphery of the magnetic member 16, thereby forming the code disk 56.
Next, the mounting hole of the coupling member 36 forming the code disk 56 and the rotating shaft 1b of the motor are coupled by press-fitting or shrink-fitting using an automatic machine.
Finally, a magnetic sensor is disposed at a predetermined position to manufacture a motor system with an encoder.
In the present embodiment, for example, magnetic paint is used for the magnetic member 16, and tin plating is used for the low melting point metal film 2, for example.
In the motor system 600 with an encoder according to the present embodiment, the code disk and the coupling member are not separate bodies, and therefore, the bonding process between the code disk and the coupling member is not necessary, and the manufacturing process is simple. In other words, the code disk manufacturing process is simple, and the code disk and the coupling member are not separate, so that the cost can be reduced.

Embodiment 7 FIG.
FIG. 7 is a schematic front sectional view of a motor system with an encoder according to the seventh embodiment of the present invention.
As shown in FIG. 7, the encoder-equipped motor system 700 according to the present embodiment includes the encoder 101 according to the first embodiment, the rotary shaft 41 of the encoder attached to the attachment hole of the coupling member 3 of the encoder 101, and the motor. 1 and a joint 14 that couples the rotary shaft 1b of the motor to the rotary shaft 41 of the encoder.
In the motor system 700 with an encoder according to the present embodiment, the mounting structure of the mounting hole of the coupling member 3 and the rotating shaft 41 of the encoder is the same as the mounting hole of the coupling member 3 and the motor of the motor system 100 with an encoder according to the first embodiment. Since the mounting structure is the same as that of the rotating shaft 1b, the code disk can be easily replaced, and the repairability is excellent. Moreover, it is excellent in productivity, can be miniaturized, and can prevent a decrease in angular accuracy of the encoder.

Further, in the motor system with encoder 700 of the present embodiment, the rotary shaft 41 of the encoder attached to the mounting hole of the coupling member 3 of the encoder 101 and the rotary shaft 1b of the motor are coupled by the joint 14. The encoder can be incorporated into various motor systems.
Such an encoder-equipped motor system in which the rotary shaft of the encoder is attached to the encoder and the rotary shaft of the encoder and the rotary shaft of the motor are coupled by a joint uses the encoders of the second to sixth embodiments. Can be realized and has the same effect.

  The motor system with an encoder according to the present invention can be used as a motor system with an encoder having excellent maintainability because the encoder can be easily replaced and has excellent repairability.

DESCRIPTION OF SYMBOLS 1 Motor, 1a Motor body part, 1b Motor rotating shaft, 2 Low melting point metal film, 3 Coupling member, 4 Boss, 5 Code disk, 6 Light emitting part, 7 Light receiving part,
8 modulation pattern, 9 adhesive, 10 mirror, 12 magnetic sensor, 14 joint,
16 magnetic member, 24 low melting point metal layer, 32, 33, 34, 35, 36 coupling member,
41 Rotating shaft of encoder, 52, 53, 54, 55, 56 Code disc,
82, 83, 84, 85 modulation pattern,
100, 200, 300 Motor system with encoder,
400, 500, 600, 700 motor system with encoder,
101, 102, 103, 104, 105, 106 Encoder.

Claims (13)

  A code disk having a modulation pattern on the disk surface and having a through hole into which the rotation shaft is inserted at the center, an attachment hole into which the rotation shaft is inserted at the center, and the code disk A coupling member bonded to the disk surface with an adhesive; a light projecting unit that projects light onto the modulation pattern; and a light receiving unit that receives light projected from the light projecting unit and reflected by the modulation pattern. The low-melting point metal film is provided at least on the side wall of the mounting hole, and the inner diameter of the mounting hole before the low-melting point metal film is formed is larger than the outer diameter of the rotating shaft to be inserted. An encoder that is large and has an inner diameter of the mounting hole after formation of the low melting point metal film smaller than an outer diameter of the rotating shaft to be inserted.   The coupling member is bonded to a disk surface opposite to a disk surface on which a modulation pattern of the code disk is provided, and a concave portion for holding an adhesive is provided on the bonding surface with the code disk. The encoder according to claim 1.   The code disk is made of resin, and a boss protruding in the thickness direction from the disk surface is provided at the center where the through hole is formed, and the inner diameter of the through hole is larger than the outer diameter of the rotating shaft to be inserted. The joining member is bonded to the disk surface opposite to the disk surface on which the modulation pattern of the code disk is provided, and is fitted to the boss in a portion that contacts the boss of the code disk. The encoder according to claim 1, wherein a stepped portion is formed.   The code disk is made of resin, and a boss protruding in the thickness direction from the disk surface is provided at the center where the through hole is formed, and the inner diameter of the through hole is larger than the outer diameter of the rotating shaft to be inserted. The joining member is formed of a magnet member and is bonded to a disk surface provided with a modulation pattern of the code disk, and is fitted to the boss on a portion of the code disk that contacts the boss. 2. The step according to claim 1, wherein a step portion is formed, and the magnetic sensor is disposed above a surface of the coupling member that faces the adhesive surface with the code disk. Encoder.   A code disk having a modulation pattern on the disk surface and having a through hole into which the rotation shaft is inserted at the center, an attachment hole into which the rotation shaft is inserted at the center, and the code disk A coupling member bonded with a low melting point metal layer to a disk surface opposite to the disk surface provided with the modulation pattern, a light projecting unit that projects light onto the modulation pattern, and projected from the light projecting unit, An encoder including a light receiving unit that receives light reflected by the modulation pattern.   A non-penetrating attachment hole into which the rotating shaft is inserted is formed on one surface, a coupling member provided with a recess on a surface facing the surface on which the mounting hole is formed, and a coupling member provided in the recess of the coupling member A mirror having a parabolic reflecting surface, an adhesive for bonding the bottom surface of the concave portion of the coupling member and the surface facing the reflecting surface of the mirror, and a code disk placed on the reflecting surface side of the mirror A light projecting unit that is installed at a focal position of the reflecting surface and transmits the code disk and projects light onto the reflecting surface; and a disk on the light projecting unit side of the code disk that is reflected by the reflecting surface An encoder including a light receiving portion that receives light that passes through a modulation pattern provided on a surface, wherein a low melting point metal film is provided on at least a side wall portion of the mounting hole, and before the low melting point metal film is formed Of the above mounting holes Encoder but larger than the outer diameter of the rotary shaft which is the insertion, the inner diameter of the mounting hole after film formation of the low melting point metal is less than the outer diameter of the rotating shaft being the insertion.   A code disk composed of a disk-shaped coupling member having a non-through attachment hole into which a rotating shaft is inserted on one surface, and a magnetic member provided on a circumferential side surface of the coupling member; An encoder comprising a magnetic sensor disposed opposite to a member at a predetermined interval, wherein a low melting point metal film is provided on at least the side wall of the mounting hole, and before the low melting point metal film is formed An encoder in which the inner diameter of the mounting hole is larger than the outer diameter of the rotating shaft to be inserted, and the inner diameter of the mounting hole after forming the low melting point metal film is smaller than the outer diameter of the rotating shaft to be inserted.   A motor system with an encoder in which the encoder according to any one of claims 1 to 5 is coupled to a motor, wherein the rotation shaft of the motor is connected to a through hole of a code disk and a coupling member of the encoder. A motor system with an encoder, which is inserted into the mounting hole and fixed to at least the mounting hole of the coupling member.   A motor system with an encoder in which the encoder and the motor according to claim 6 or 7 are coupled, wherein the rotation shaft of the motor is inserted into a mounting hole of a coupling member in the encoder and fixed. A motor system with an encoder.   A motor system with an encoder in which the encoder according to any one of claims 1 to 5 and the motor are coupled, and is inserted into a through hole of a code disk and a mounting hole of a coupling member in the encoder, A motor system with an encoder, wherein the rotary shaft of the motor is coupled with a rotary shaft of the encoder fixed to at least the mounting hole of the coupling member by a joint.   An encoder-equipped motor system in which the encoder according to claim 6 or 7 is coupled to a motor, wherein the motor is inserted into a mounting hole of a coupling member in the encoder and fixed to a rotating shaft of the encoder. A motor system with an encoder, wherein a rotating shaft is coupled by a joint.   A step of preparing a code disk provided with a modulation pattern composed of a reflective portion and a non-reflective portion by forming a thin film of chromium or the like by vapor deposition, a step of preparing a coupling member having a mounting hole in the center, and the above-described coupling An automatic machine is formed by plating a surface of the member and forming a low melting point metal film on the surface of the coupling member, and a mounting hole of the coupling member on which the low melting point metal film is formed and a rotation shaft of the motor. A step of bonding using press fitting or shrink fitting, a step of disposing an adhesive on the connecting member, a layer of the connecting member provided with the adhesive and the code disk provided with the modulation pattern. An encoder that sequentially performs a step of curing, a step of curing the adhesive to bond the coupling member and the code disk, and a step of disposing a light projecting unit and a light receiving unit at predetermined positions Manufacturing method of the motor system.   A step of preparing a coupling member, which is a code disk body having a mounting hole in the center, a step of applying and fixing a magnetic member on a circumferential side surface of the coupling member, and a step of applying the magnetic member to the coupling member. A step of forming a low melting point metal film by plating, and removing the low melting point metal film on the magnetic member by polishing to improve the surface accuracy and roundness of the outer periphery of the magnetic member; A step of connecting the mounting hole of the coupling member forming the code disk and the rotation shaft of the motor by press-fitting or shrink-fitting using an automatic machine, and disposing a magnetic sensor at a predetermined position. The manufacturing method of the motor system with an encoder which implements a process in order.

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