JP5082472B2 - Rotary encoder positioning unit and rotary encoder having the same - Google Patents

Description

  The present invention relates to a rotary encoder positioning unit and a rotary encoder having the same.

Conventionally, for example, a rotation code plate or a magnet that is mounted on a measurement object such as a motor and rotates together, and the rotation code plate and the rotation of the magnet are detected by an optical sensor or a magnetic sensor provided on a circuit board. A rotary encoder that detects a target rotation speed, a rotation angle, and the like is widely used (see, for example, Patent Document 1).
JP 2005-24283 A

  However, in the conventional rotary encoder, when the rotary encoder fails and the rotary encoder is replaced, the center of the rotary encoder coincides with the center of the rotary shaft of the motor, or the rotation reference position of the rotary encoder and the rotation reference of the motor. It was necessary to perform a complicated operation of fixing the rotary encoder and the motor after the operator measured the operation for matching the position using a measuring instrument in the field.

In order to solve the above-described problems, the present invention is a positioning unit that is formed of a ring-shaped member and is disposed between a rotary encoder and a rotating device to be measured, and includes a hub portion of the rotary encoder and the rotating device. In order to enable alignment with the rotary shaft, a circumferential surface configured to be fitted with an inlay portion of the rotary encoder and a rotation reference position of the rotary encoder formed on a surface different from the circumferential surface And a notch portion to which a positioning block that enables alignment with the rotation reference position of the rotating shaft is fixed . A rotary encoder positioning unit is provided.
The present invention also provides a rotary encoder having a rotary encoder positioning unit.

  According to the present invention, it is possible to provide a rotary encoder positioning unit and a rotary encoder having the rotary encoder that enable easy assembly of the rotary encoder and the motor when the rotary encoder is replaced.

  Hereinafter, a rotary encoder and a rotary encoder positioning unit according to an embodiment of the present invention will be described with reference to the drawings. In the following description, a case where the rotary encoder is attached to the motor via the positioning unit will be described. However, the present invention is not limited to the motor.

  FIG. 1 is a schematic cross-sectional view of a rotary encoder and a positioning unit in a state in which the rotary encoder is fixed to a motor via the positioning unit of the rotary encoder according to the embodiment. FIG. 2 is a perspective view of the upper surface of the hub portion of the rotary encoder. FIG. 3 is a schematic view of a positioning unit of the rotary encoder according to the embodiment. FIG. 4 is a schematic view of a state in which the rotary encoder is fixed to the motor via the positioning unit.

  1 and 2, the rotary encoder 1 is mounted with a hub portion 2 that is inserted into a rotation shaft (not shown) of the motor 100 and rotates, a main body mold portion 3 that rotatably accommodates the hub portion 2, and an electrical component. Circuit board part 4 and cover member 5 for shielding electrostatic noise and magnetic noise.

  The hub part 2 is a cylindrical member in which an insertion hole 2a for inserting and fixing the rotating shaft of the motor 100 in a nonmagnetic metal such as an aluminum alloy is formed. The diameter is smaller than the outer diameter of the other part. A male screw portion 7 is formed on the outer periphery of the lower end portion.

  As shown in FIG. 2, a scale disk 6 is externally inserted on the upper end portion side of the hub portion 2 and is screwed to the hub portion 2 with screws 8 a via a presser ring 8. The scale disk 6 is a disk-shaped member, and a plurality of slits (not shown) are formed in the circumferential direction on the outer peripheral portion thereof.

  Near the center of the upper end portion of the hub portion 2, a ring-shaped magnet 21 that generates a signal of one cycle per rotation by a magnetic sensor described later is bonded to the upper end portion of the hub portion 2 with UV adhesive or the like. Yes. This ring-shaped magnet 21 is formed of a magnetic sintered body or the like.

  The ring-shaped magnet 21 has a convex portion 21 a on the inner diameter portion, and this convex portion 21 a is engaged with a groove portion 2 c of a cylindrical convex portion 2 b provided on the upper end portion of the hub portion 2. The ring-shaped magnet 21 is magnetized so that the magnetic poles a and b are positioned at a substantially central portion of the convex portion 21a of the ring-shaped magnet 21 and a position facing the convex portion 21a. By magnetizing in this way, a signal of one cycle / one rotation can be generated. Note that the number of the magnetic poles a and b is not limited to two and is appropriately determined by design. Further, the bonding is not limited to the UV effect, and other adhesives can be used.

  Further, the main body mold part 3 accommodates the hub part 2 rotatably, and is attached to the motor 100 so that the through hole 9 is provided in the vertical direction for guiding the rotation shaft of the motor 100 to the insertion hole 2a of the hub part 2. A cylindrical housing provided. Further, in the main body mold portion 3, a female screw portion 10 that is screwed with the male screw portion 7 of the hub portion 2 is formed in the lower portion of the inner wall 9 a of the main body mold portion 3 that forms the through hole 9. The main body mold portion 3 is formed with a through hole 11 penetrating in the vertical direction. The through hole 11 includes a light source unit 12 including a light source 12a and a collimator lens 12b.

  The circuit board portion 4 is a plate-like member that is attached to the upper end portion of the main body mold portion 3 with a screw (not shown) and substantially closes the through hole 9. The light source unit 12 of the main body mold portion 3 is disposed on the lower surface of the circuit board portion 4. The optical sensor 13 for receiving the light from is provided.

  In addition, a magnetic sensor 22 such as a Hall element is disposed on the upper portion of the ring-shaped magnet 21 below the circuit board portion 4, and the rotation of the hub portion 2 is detected by a change in the magnetic field from the magnetic pole of the ring-shaped magnet 21. To do.

  On the upper surface of the circuit board unit 4, electrical components such as an analog / digital converter that processes detection signals from the optical sensor 13 and the magnetic sensor 22 are mounted.

  Further, an insertion / removal hole 4a for inserting / removing a set screw (not shown) for fixing the hub portion 2 and the rotating shaft of the motor 100 into and out of the rotary encoder 1 is formed in the central portion of the circuit board portion 4, A connector 19 for exchanging signals with the outside is provided in the peripheral portion of the upper surface.

  Further, a cover member 5 for shielding the main body mold part 3, the optical sensor 12, the magnetic sensor 22, and the circuit board part 4 is fitted to the outer peripheral part 3a of the main body mold part 3, and a screw main body mold part 3 (not shown) is fitted. It is fixed to. The cover member 5 is preferably formed of a high permeability metal such as soft iron in order to prevent electrostatic noise and magnetic noise. Further, in order to provide a sufficient magnetic shielding effect, the cover member 5 is preferably made as thick as possible. In the present rotary encoder 1, a sufficient magnetic shielding effect is achieved by setting the thickness of the cover member 5 to 2 mm or more.

  Further, an insertion / removal hole 5a for inserting / removing a set screw (not shown) for fixing the hub portion 2 and the rotating shaft of the motor 100 into and out of the rotary encoder 1 is provided in the central portion of the cover member 5 in the vicinity of the outer peripheral portion. A hole 5b for allowing the connector 19 to pass therethrough is formed. A cap 5c for closing the insertion / removal hole 5a is provided after the hub portion 2 is fixed to the rotating shaft of the motor (not shown) with a set screw to prevent dust and the like from entering the rotary encoder 1. .

  A screw hole of a mounting screw (not shown) of the circuit board portion 4 and a screw hole of a fixing screw (not shown) for fixing the cover member 5 are electrically connected to each other, and the cover member 5 has a screw and a screw hole. And is connected to the signal ground of the circuit board part 4. For example, the circuit board portion 4 and the cover member 5 can be electrically connected by forming the screw hole with a conductive member.

  A shield plate is provided between the circuit board portion 4 and the hub portion 2 to prevent electrostatic noise and protect the scale disk 6 and the like when the circuit board portion 4 is detached from the main body mold portion 3. 18 is arranged.

  In this way, the rotary encoder 1 is configured. As described above, the rotary encoder 1 operates as both an optical rotary encoder and a magnetic rotary encoder.

  In the rotary encoder 1, the light emitted from the light source unit 12 is irradiated from below on the scale disk 6 that rotates in conjunction with the rotation shaft of the motor 100. Light that has passed through a slit (not shown) in the scale disk 6 is received by the optical sensor 13 and converted into an analog signal. Further, a change in the magnetic field from the magnetic pole of the ring-shaped magnet 21 is detected by the magnetic sensor 22. These analog signals are converted into digital signals by an electrical component such as an analog / digital converter mounted on the circuit board unit 4. Based on this digitized signal, the rotation amount and rotation angle of the rotation shaft of the motor can be calculated.

  Further, the rotary encoder 1 can fix the hub portion 2 to the main body mold portion 3 by fastening and fixing the male screw portion 7 of the hub portion 2 and the female screw portion 10 of the main body mold portion 3 described above.

  By attaching the circuit board part 4 to the main body mold part 3, the main body mold part 3, the hub part 2 and the circuit board part 4 can be handled as a single unit, so that these are managed and stored separately. It is also possible to eliminate the complexity.

  Thus, in this rotary encoder 1, since the convex part 21a is provided in the ring-shaped magnet 21, and the magnetic pole a is located in the position of this convex part 21a, the operator can position the magnetic poles a and b at a glance. As a result, it is possible to easily assemble the ring-shaped magnet 21 and the scale disk 6 such as alignment.

  Furthermore, since the convex portion 21a is engaged with the groove portion 2c of the cylindrical convex portion 2b of the hub portion 2, the ring-shaped magnet 21 is prevented from idling even when the adhesion of the ring-shaped magnet 21 is peeled off. be able to.

  Further, the rotary encoder 1 has a cover member 5 made of a metal member that is connected to the signal ground on the outer peripheral portion and has a magnetic shield characteristic, so that the rotary encoder 1 is connected to the outside of the rotary encoder 1 (for example, connected to the rotary encoder 1). It is possible to prevent erroneous detection of the rotary encoder 1 due to electrostatic noise and magnetic noise generated in the motor).

  Moreover, since the circuit board part 4 etc. of the rotary encoder 1 are protected by the cover member 5, handling of an operator becomes easy.

  In the above description, the cover member 15 is configured to cover the entire optical sensor 13, magnetic sensor 22, circuit board portion 4, and main body mold portion 3. If the sensor 22 and the circuit board part 4 are configured to be covered, the same effect can be obtained.

  Next, a rotary encoder positioning unit (hereinafter referred to as an inlay unit) will be described with reference to FIG. 1, FIG. 3, and FIG.

  In FIG. 1, the rotary encoder 1 is fixed to the motor 100 via a spigot unit 50 with screws 102. As shown in FIG. 3, the inlay unit 50 is made of a metal ring-shaped member, and is configured such that the inner peripheral surface 51 of the inlay unit 50 is fitted with the inlay portion 31 of the rotary encoder 1 (see FIG. 1). ). Further, the inlay unit 50 is formed with a notch portion 52 for fixing a positioning block described later (see FIGS. 3 and 4).

  The inlay portion 31 of the rotary encoder 1 serves as a reference for the rotational center of the hub portion 2, the positional relationship between the unillustrated pattern of the scale disk 6 and the optical sensor 13, and the inlay portion 31 is used as a reference for the inlay unit 50. By fitting to the inner peripheral surface 51, the center of rotation of the hub portion 2 and the center of the inlay unit 50 can be matched.

  When the spigot unit 50 is fixed to the motor 100, the screw 101 is temporarily fixed to the fixing surface of the motor 100 while the spigot unit 50 is movable, and the rotation shaft of the motor 100 is inserted into the center hole of the positioning tool (not shown). By pressing the outer peripheral portion of the positioning tool against the inner peripheral surface 51 of the inlay unit 50, the center position of the inlay unit 50 and the rotation axis center of the motor 100 are made to coincide.

  The outer peripheral portion of the positioning tool has the same shape as the inlay portion 31 of the rotary encoder 1, and the relationship between the outer peripheral portion and the center axis of the positioning tool is the relationship between the inlay portion 31 of the rotary encoder 1 and the center of the hub portion 2. Configured to match.

  After aligning the center of the rotation axis of the motor 100 with the center position of the inlay unit 50 using a positioning tool, the inlay unit 50 is fixed to the fixing surface of the motor 100 by tightening the screw 101. As a result, it is possible to make the center of the inlay unit 50 coincide with the center of the rotary shaft of the motor 100 and the center of the rotary encoder 1, that is, the center of the hub portion 2.

  After fixing the inlay unit 50 to the motor 100, the rotary encoder 1 is attached to the rotating shaft of the motor 100 through the inlay unit 50. In this state, the rotation shaft of the motor 100 and the center of the hub portion 2 of the rotary encoder 1 coincide with each other.

  Subsequently, the rotation reference position of the rotary encoder 1 and the motor 100 is aligned. In the state where the rotary encoder 1 and the motor 100 are assembled first, the rotation reference positions of the rotary encoder 1 and the motor 100 are shifted. Therefore, a measuring instrument is connected to the connector 19 of the rotary encoder 1, the rotary encoder 1 body is rotated so that the single turn value (ST value) of the counter approaches zero, and the position of the rotary encoder 1 where the ST value is substantially zero is determined. Once determined, the rotary encoder 1 is fixed to the motor with screws 102 (see FIG. 1).

  Thereafter, the positioning block 70 is fixed to the notch portion 52 of the inlay unit 50. The positioning block 70 positions both end surfaces 71 and 72 so as to come into contact with the notch end surfaces 3b and 3c of the cylindrical member 3d provided on the lower outer peripheral portion of the main body mold portion 3 of the rotary encoder 1. At 73, it is fixed to the inlay unit 50 and the motor 100.

  As described above, the rotary encoder 1 has the positioning unit 50 (inlay unit) of the rotary encoder 1, and the center of the hub portion 2 and the rotation axis center of the motor 100 can be easily aligned via the inlay unit 50. It becomes possible.

  In addition, since the positioning block 70 is fixed to the notched portion 52 of the inlay unit 50, the end surface of the notched portion of the outer peripheral portion 3d of the main body unit 3 of the rotary encoder 1 when the rotary encoder 1 is replaced. By bringing 3b and 3c into contact with the end surfaces 71 and 72 of the positioning block 70, the rotation reference position of the rotary encoder 1 and the rotation reference position of the motor 100 can be easily matched. It should be noted that the cutout partial end faces 3b and 3c of the main unit 3 and the end faces 71 and 72 of the positioning block 70 can be positioned by contacting at least one of them. Needless to say, in the rotary encoder 1 used for replacement, the rotation reference position with respect to the motor 100 is adjusted in advance by an assembly tool using the inlay unit 50 and the positioning block 70 described above at the factory.

  As described above, by using the positioning unit 50 (inlay unit) of the rotary encoder 1 according to the embodiment, the rotary encoder 1 and the motor 100 that have been conventionally used at the time of replacement of the rotary encoder 1 can be used. There is no need to adjust the position, and the rotary encoder 1 can be easily replaced.

  The above-described embodiment is merely an example, and is not limited to the above-described configuration and shape, and can be appropriately modified and changed within the scope of the present invention.

It is the cross-sectional schematic of the rotary encoder and positioning unit of the state which fixed the rotary encoder to the motor via the positioning unit of the rotary encoder concerning embodiment. It is a perspective view of the hub part upper surface of a rotary encoder. It is a general-view figure of the positioning unit of the rotary encoder concerning an embodiment. It is the schematic of the state which fixed the rotary encoder to the motor via the positioning unit.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Rotary encoder 2 Hub part 3 Main body mold part 4 Circuit board part 5 Cover member 6 Scale disk 12 Light source unit 13 Optical sensor 21 Ring-shaped magnet 22 Magnetic sensor 21a Convex part 31 Inlay part 50 Positioning unit (Inlay unit)
70 Positioning block

Claims (5)

A positioning unit comprising a ring-shaped member and disposed between the rotary encoder and the rotating device to be measured,
A circumferential surface configured to mate with an inlay portion of the rotary encoder to enable alignment between the hub portion of the rotary encoder and the rotating shaft of the rotating device;
A notch portion formed on a surface different from the peripheral surface, to which a positioning block that allows alignment between a rotation reference position of the rotary encoder and a rotation reference position of the rotary shaft is fixed;
Positioning unit of the rotary encoder, characterized in that it comprises a. Claims, characterized in that to pre Symbol ring member reference cylindrical surface of the rotary encoder on the inner peripheral surface of said peripheral surface is fitted in, it is matched with the center of the rotary shaft and the center of the hub portion 2. A rotary encoder positioning unit according to 1. Before Symbol positioning surface provided on the outer peripheral portion of the body molding portion of the rotary encoder at least on one end face of the positioning block abuts
The rotary encoder positioning unit according to claim 1 or 2, wherein a rotation reference position of the rotary encoder and a rotation reference position of the rotary shaft are made to coincide with each other.   A rotary encoder comprising the positioning unit of the rotary encoder according to any one of claims 1 to 3. A ring-shaped magnet having a predetermined magnetic pole;
The rotary encoder according to claim 4, wherein the ring-shaped magnet has a convex portion that can be aligned with the hub portion and is engaged with the hub portion.

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