JPH08251875A - Motor fitted with encoder - Google Patents

Abstract

PURPOSE: To provide a motor fitted with an encoder wherein the encoder can be coupled to a part of the motor with high accuracy and stably, while downsizing the whole device, by a coupling mechanism properly set. CONSTITUTION: An encoder H and a motor M are united, by providing at least either the motor M or the encoder H with a projection, and engaging a circular attachment member LA with the projection, and coupling the attachment member LA with one end of elastic member through spring member, and coupling the other end of the elastic member to the motor M or the encoder H.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor with an encoder, and more particularly, to a rotary shaft having a radial diffraction grating provided on the rotary shaft of a relative rotating object such as a motor, and the rotary shaft having the scale disk attached to the rotary shaft. By irradiating the disc with the light flux from the light source means and detecting the phase-modulated signal light generated from the diffraction grating, the disc, that is, the rotational position of the rotating shaft, the rotational displacement, the rotational displacement, the rotational speed, and the rotational acceleration. The present invention relates to a motor with an encoder that detects rotation information such as.

[0002]

2. Description of the Related Art Conventionally, there is a rotary encoder as one of the devices for detecting the rotation information of a rotating mechanism such as a motor with high accuracy. Among them, the rotary encoder using the grating interference method is used in many fields because it can obtain highly accurate rotation information.

In this rotary encoder, a plurality of diffraction gratings (radial diffraction gratings) having a grid pattern of a light transmitting portion and a light shielding portion are periodically formed on a disk-shaped circumference, and a scale disk is periodically formed at one end of a rotary shaft. And the other end of the rotating shaft is attached to the rotating shaft of the rotating mechanism (motor). Then, the radial diffraction grating is irradiated with a light beam from the light source means, the phase-modulated signal light diffracted by the diffraction grating is detected by the detection means, and the signal from the detection means is processed by the electric processing circuit, that is, the scale disk, The rotation information of the rotating mechanism is sought.

Conventionally, various motors with an encoder have been proposed in which a rotary encoder and a motor are integrally configured as a device for detecting the rotation information of a rotating mechanism, and the rotation of the motor is controlled by using a detection signal from the rotary encoder. ing.

For example, Japanese Utility Model Laid-Open No. Sho 63-135220, Japanese Utility Model Laid-Open No. 5-8428 propose an integral motor with an encoder in which an encoder and a motor are connected.

[0006]

Recently, along with the miniaturization of the rotating mechanism, there has been a demand for miniaturization of the motor with an encoder and a reduction in its diameter.

In such an encoder-equipped motor, generally, the shaft (rotary shaft) of the motor M and the shaft of the encoder E are provided with cylindrical fitting portions which are fitted to each other. The shaft of the motor and the shaft of the encoder are positioned by fitting, and are directly connected by a screw, a pressing spring, an adhesive or the like. In this case, if the encoder and the motor body are directly connected by a screw or the like, a force may be generated in the radial direction of the shaft due to an eccentricity error or the like during rotation of the shaft, and the built-in bearing portion may be damaged.

Therefore, generally, the encoder and the motor are fixed to each other via an elastic connecting member such as a leaf spring. However, when the elastic coupling member is made smaller to narrow the gap between the mounting surfaces of the motor M and the encoder E to reduce the size of the entire device, the mounting surfaces are replaced with commonly used screws (JIS-M2). However, there is a problem that it is very difficult because the screw is inserted in the opposite direction from each other in the encoder and the motor.

According to the present invention, when an encoder is connected to a motor and an elastic member in which the connecting portion of the encoder and the motor is appropriately set is used for integration, the size and diameter of the entire apparatus can be reduced. Another object of the present invention is to provide a motor with an encoder that can connect the encoder to the motor with high accuracy and stability.

[0010]

An encoder-equipped motor according to the present invention comprises: (1-1) A protrusion is provided on at least one of the motor and the encoder, and the protrusion is fitted with an annular attachment member to form an elastic member. One end and the attachment member are connected by a spring member, the other end of the elastic member is connected by the motor or the encoder, and the encoder and the motor are integrally configured.

(1-2) A groove is provided in a part of the housing of at least one of the motor and the encoder, and one end of the elastic member and the housing are capped with an elastic member using the groove, and the elastic The other end of the member and the motor or the encoder are fixed, and the encoder and the motor are integrally configured.

(1-3) A groove or notch is provided in a part of the housing of at least one of the motor and the encoder, one end of the elastic member is inserted into the groove or notch, and the other end is the motor or It is characterized in that it is fixed to an encoder and the encoder and the motor are integrated.

(1-4) One end of the elastic member is attached to at least one housing of the motor or the encoder through a mounting mechanism, the other end is fixed to the motor or the encoder, and the encoder and the motor are integrated. It is characterized by being configured.

[0014]

Embodiment 1 FIG. 1 is a sectional view of the essential portions of Embodiment 1 of the present invention. In the figure, M is a motor, and SH is a rotating shaft of the motor M.
Reference numeral 1 denotes an annular convex projecting portion (columnar portion) provided around the rotating shaft SH of the housing constituting the motor M. Rotation axis S
H is a rotary shaft ES of an encoder H and a fitting hole ESH which will be described later.
It is fitted with a coaxial arrangement and is screwed. H is a rotary encoder. Ha is a housing containing each element of the rotary encoder H. D is a scale disc, and a plurality of phase-diffraction diffraction gratings (radial diffraction gratings) composed of a grating pattern of a light-transmitting portion and a light-shielding portion or a transmission-type uneven portion are formed on the circumference of the disk. Individual,
It is arranged radially in a predetermined cycle. The scale disk D is attached to the attachment portion S at one end of the rotary shaft ES of the encoder H.

Reference numeral L denotes a light source means, which is composed of, for example, an LED or a semiconductor laser, and illuminates the scale disk D with a light beam from the light source means L. PD is a detecting means, which detects the light flux from the light source means L through the diffraction grating of the scale disk D.

In this embodiment, the scale modulating disk D (rotating shaft S) is processed by the signal processing circuit provided on the flexible printed circuit board FP using the phase-modulated signal light obtained by the detecting means PD.
The rotation information of H) is detected. The flexible printed circuit board FP is accommodated in the upper space FS in the housing Ha of the encoder H in a folded state.

In this embodiment, one end LSa of the leaf spring connecting member LS is screwed to the mounting portion Hb at the bottom of the housing Ha of the encoder H. On the other hand, the connecting portion 1 of the protruding portion 1 of the motor M
A state where the attachment LA is fitted to the fitting columnar portion 1 of the motor M, in which a one end LSb of the leaf spring coupling member LS and the attachment LA are screw-fixed from a side direction with the annular attachment LA in the side direction. Screw member 12
Press from the side and press the columnar part 1 and attachment LA
Is fixed. This connects the motor and the encoder. The outer frame Hc of the encoder H is fitted to the outer frame Ma of the motor M as shown in the figure.

In the present embodiment, the motor M and the encoder H are formed by using the leaf spring connecting member LS and the screw member having the above-mentioned structure.
And an eccentricity error due to the rotation of the rotary shaft are corrected by this, and the space between the mounting surfaces of the motor M and the encoder H is narrowed to achieve a motor with an encoder that is downsized. are doing.

2 to 6 are cross-sectional views of essential parts of Examples 2 to 6 of the present invention. 2 to 6, the same elements as those shown in FIG. 1 are designated by the same reference numerals. Example 2 of FIG.
Is one end L of the leaf spring connecting member LS as compared with the first embodiment of FIG.
The screw fastening position when attaching Sa to the encoder H is different, and other configurations are the same.

In this embodiment, one end L of the leaf spring connecting member LS is used.
This is different from the first embodiment in that Sa is fixed to an annular protrusion Hd provided around the rotation axis ES of the encoder H with a screw member 21 from the outer surface direction.

Embodiments 3 to 6 of FIGS. 3 to 6 are different from Embodiment 1 of FIG. 1 in the shape of the leaf spring connecting member LS and the method of attaching the leaf spring connecting member LS to the motor M and the encoder H. They are different, and other configurations are the same.

In the third embodiment of FIG. 3, the mounting portion 31 of the motor M is
The one end LSb of the leaf spring connecting member LS is fixed by a screw member 31. A groove 2a is provided from the side on the side surface of the connecting portion 2 of one encoder H. Then, the other end LSa of the leaf spring connecting member LS is engaged with the bottom surface of the connecting portion 2, and the engaging region of the other end LSa is a U-shaped leaf spring attachment (elastic member) A using the groove portion 2a. It is inserted from the side.

The attachment A sandwiches and holds the leaf spring connecting member LS and the encoder H. This connects the motor M and the encoder H. The U-shaped leaf spring attachment A as an elastic member may be adhered or fixed with a screw if necessary. Further, the encoder H, the attachment A, and the plate spring connecting member LS may be formed with fitting concave and convex portions in order to prevent displacement in the circumferential direction.

In the fourth embodiment of FIG. 4, the shape of the leaf spring connecting member LS is different from that of the third embodiment of FIG. 3, so that the encoder H is attached to the connecting portion 2 and the motor M is attached 31.
As shown in the figure, it is installed from the inside.
Only this point is different, and other configurations are the same.

In the fifth embodiment of FIG. 5, a groove portion 2b is provided on the side surface of the connecting portion 2 of the encoder H in the axial direction of the rotary shaft ES, as compared with the third embodiment of FIG. The difference is that the bent portion LSC in which one end of the leaf spring connecting member LS is bent is inserted into the groove portion 2b, and the encoder H is connected to the motor M by this, and other configurations are the same.

In the sixth embodiment shown in FIG. 6, a cutout portion 2c is provided on the side surface of the connecting portion 2 of the encoder H as compared with the third embodiment shown in FIG. Then, one end LSa of the leaf spring connecting member LS is inserted into the cutout portion 2c by utilizing the space between the cutout portion 2c and the outer frame Hc, thereby connecting the motor M and the encoder H. The difference is that the other configurations are the same.

FIG. 7 is an explanatory view of the essential structure of the seventh embodiment of the present invention. In the figure, the same elements as those shown in FIG. 1 are designated by the same reference numerals.

In this embodiment, an annular projecting portion (cylindrical fitting portion) 72 is provided around the rotating shaft SH of the motor M.
Similarly, the protrusion 7 also surrounds the rotation axis ES of the encoder H.
An annular projecting portion (cylindrical fitting portion) 71 having the same shape as 2 is provided. An annular attachment LA1 (LA2) is fitted in the protruding portion 71 (72).

Two places LSa of the leaf spring connecting member LS are fixed to the annular attachment LA1 with screws, and another two places LSb are fixed to the annular attachment LA2 with screws. A screw hole LA1a for a fixing screw is provided on the side surface of the attachment LA1, and the fixing screw 73 engages with a cylindrical fitting portion 71 of the main body Ha of the encoder H to fix the screw.

Similarly, there is a screw hole LA2a for a fixing screw on the side surface of the attachment LA2, which is screwed and fixed to the cylindrical fitting portion 72 of the main body of the motor M by the fixing screw 74. This connects the motor and encoder.

In the present embodiment, the shape and number of screws, springs, and attachments as a pressing member for connecting the motor and the encoder can be set arbitrarily.

[0032]

As described above, according to the present invention, by connecting the encoder to the motor and using the elastic member in which the connecting portion of the encoder and the motor is properly set when the encoder is integrated, the entire apparatus can be realized. It is possible to achieve a motor with an encoder that can connect the encoder to the motor with high accuracy and stability even if the size and the diameter of the motor are reduced.

[Brief description of drawings]

FIG. 1 is a sectional view of a main part of a first embodiment of the present invention.

FIG. 2 is a sectional view of a main part of a second embodiment of the present invention.

FIG. 3 is a sectional view of a main part of a third embodiment of the present invention.

FIG. 4 is a sectional view of a main part of a fourth embodiment of the present invention.

FIG. 5 is a cross-sectional view of the essential parts of Embodiment 5 of the present invention.

FIG. 6 is a sectional view of the essential parts of Embodiment 6 of the present invention.

FIG. 7 is an explanatory diagram of a main part configuration of a seventh embodiment of the present invention.

[Explanation of symbols]

 M Motor H Encoder SH, ES Rotation axis D Scale disk L Light source means PD Detection means LS Leaf spring connecting member LA Circular attachment

Claims (4)

[Claims] 1. A protrusion is provided on at least one of a motor and an encoder, the protrusion is fitted with an annular attachment member, and one end of an elastic member is connected with the attachment member by a spring member, and the elastic member is provided. A motor with an encoder, characterized in that the other end of the encoder is connected with the motor or the encoder to integrally configure the encoder and the motor. 2. A groove is provided in a part of a housing of at least one of a motor and an encoder, and one end of the elastic member and the housing are crowned with an elastic member using the groove, A motor with an encoder, characterized in that the end and the motor or the encoder are fixed, and the encoder and the motor are integrally configured. 3. A groove or notch is provided in a part of at least one housing of a motor or an encoder, one end of an elastic member is inserted into the groove or the notch, and the other end is fixed to the motor or the encoder. Then, the motor with an encoder, wherein the encoder and the motor are integrally configured. 4. One end of an elastic member is attached to at least one housing of a motor and an encoder via an attachment mechanism,
A motor with an encoder, wherein the other end and a motor or an encoder are fixed and the encoder and the motor are integrally configured.