JPS62207153A - Motor connection type encoder device - Google Patents

Abstract

PURPOSE:To shorten overall length while preventing the transmission of the heat of a motor by extending one end of a shaft for the motor to an encoder base section mounted through a clearance and fitting a disk for measurement at the nose of one end of the shaft for the motor. CONSTITUTION:A shaft 4 is supported rotatably to bearings 5 for side plates 2a, 2b set up on both sides of a motor case 2. An encoder 6 is connected to the side plate 2a by a screw 5a through a clearance W, and a collar member 17 consisting of a heat-insulating material is interposed. A bearing holding section 2aA is brought into contact with an encoder base section 8 through a heat-insulating seal ring 18. A disk with a slit mounted at the nose of the shaft 4 is turned between a light-emitting element 13 and a photodetector 14, and an output-beam signal is transmitted over a circuit substrate 16, thus detecting the number of revolution. Accordingly, a direct transmission over the encoder of heat generated from a motor is prevented, thus shortening the axial length of a device.

Description

DETAILED DESCRIPTION OF THE INVENTION a. Field of Industrial Application The present invention relates to a motor-connected encoder device, in particular:
This relates to new improvements to shorten the length in the axial direction (as well as to prevent heat transfer from the motor to the encoder).

b. Prior Art There are various configurations of this type of motor-connected encoder device that has been used in the past, in which a motor and an encoder are integrally connected, but here are some typical ones: As shown in FIGS. 2 to 5.

That is, in the configuration shown in Fig. 2, stator 1
One end 2a and the other end 2b of the motor case 2 have
A rotary shaft 4 having a rotor 3 protrudes outward through a bearing 5, and an encoder 6 is connected to one end 2a of the shaft 4 through a connecting body 5a. are integrally connected by.

A rotary shaft 10 projects from the encoder base 8 of the encoder 6 toward the motor 7 via a bearing 9, and the rotary shafts 4 and 10 are integrally connected by a flexible rotary shaft connecting portion 11.

A rotary disk 12 having a slit (not shown) is integrally attached to the rotary shaft 10, and a signal generating section consisting of a light emitting source is mounted on the encoder base 8 so as to sandwich the rotary disk 12. 13, and a signal receiving section 14 consisting of a light receiving element.

An encoder casing 15 having a cylindrical shape is attached to the outer periphery of the encoder base 8, and inside the encoder casing 15 there is an encoder having an IC and the like for processing signals from the signal receiving section 14. A circuit board 16 is fixedly disposed.

Furthermore, the configuration shown in FIG. 3 shows a configuration in which the motor 7 and encoder 6 are completely integrated, and the motor case 2
The encoder base 8 is directly attached to the encoder base 8 to shorten the length in the axial direction when the motor 7 and encoder 6 are connected.

In addition, since the other parts are the same as the configuration in Figure 2,
The same reference numerals as those in the figure are used, and the explanation thereof will be omitted.

Further, the configuration shown in FIG. 4 is one in which the motor 7 and the encoder 6 are integrally configured with a degree of freedom in the axial direction, and one end 2a of the motor case 2 and the encoder base 8 are connected to a flexible case. They are connected by a connecting part 17 and fixed by a pin 18. Therefore, although this flexible case connecting portion 17 is freely expandable and contractible in the axial direction, it is constructed integrally in the rotational direction.

Further, the rotating shaft 4 of the motor 7 is coaxially fitted into the rotating shaft 10 of an encoder 60 configured in a hollow shape, and this rotating shaft 10 is rotatably held within the encoder 6 by a bearing 9. .

In addition, since the other parts are the same as the configuration in Figure 2,
The same reference numerals as those in the figure are used, and the explanation thereof will be omitted.

The configuration shown in FIG. 5 uses substantially the same means as the configuration shown in FIG. 4 to integrally connect the motor 7 and the encoder 6. The rotating shaft 4 of 7 is shortened (but the configuration is similar to that in FIG. 6. Other parts are the same as in FIG. Explanation will be omitted.

Problems that the C0 invention aims to solve Since conventional motor-connected encoder devices are configured as described above, it is possible to integrate the motor and encoder, but there are various problems such as the following. However, there were some problems.

First, in the case of the configuration shown in Figure 2, the length in the axial direction becomes longer,
This resulted in an increase in costs.

In addition, in the case of the configuration shown in Fig. 6, heat transfer from the motor to the encoder is intense, and the heat rise of electronic components such as IC of the encoder circuit board installed in the encoder exceeds the heat resistance temperature, causing the electronic components to It was sometimes destroyed.

Furthermore, in the case of the configurations shown in FIGS. 4 and 5, the axial distance of the flexible case connecting portion cannot be shortened, so the axial length of the entire configuration cannot be sufficiently shortened. First, it was not possible to reduce the cost of the overall configuration.

The present invention promptly solves the above problems, effectively prevents heat transfer to the encoder section, and at the same time reduces the length of the entire configuration in the axial direction. The purpose is to provide

Means for Solving Problem d1 A motor-connected encoder device according to the present invention includes a motor having a rotating shaft protruding outward from one end of a motor case having a stator, and a motor fixed to the one end through a required gap. , an encoder base through which the rotating shaft is rotatably provided; a rotating disk provided on the rotating shaft; a signal generating section and a signal receiving section disposed corresponding to the rotating disk; The encoder case includes an encoder case provided at the encoder base and an encoder circuit board disposed within the encoder case, and the gap prevents heat transfer to the encoder circuit board. This is the configuration.

01 Effect In the motor-connected encoder device according to the present invention,
In the configuration for connecting the motor and encoder,
Since the encoder is connected through the gap, heat transfer from the motor to the encoder is virtually blocked, and heat transfer can be prevented, axial shortening, and integral connection can be achieved at the same time.

f. Embodiments Hereinafter, preferred embodiments of the motor-connected encoder device according to the present invention will be described in detail with reference to the drawings.

Note that the same or equivalent parts as in the conventional example will be described using the same reference numerals.

FIG. 1 shows a preferred embodiment of a motor-connected encoder 6 according to the present invention. One end 2a and the other end 2 of motor case 2
b, a rotary shaft 4 having a rotor 3 rotatably protrudes outward via a bearing 5, an encoder 6 is connected to one end 2a of the shaft 4 via a plurality of connectors 5a, and a motor 7 and encoder 6 are integrally connected by this connecting body 5.

The aforementioned connecting body 5a is composed of a mounting screw body,
This connecting body 5a passes through a mounting hole 8a of an encoder base 8 made of aluminum material, is screwed into a screw hole 2c of one end 2a of the motor 7, and is provided between the encoder base 8 and one end 2a. Collar member 1 made of provided heat insulating material
The connecting body 5a passes through the inside of the connector 7.

Therefore, the encoder base 8 and the one end 2a are connected via the gap W by the connecting body 5a and the collar member 17 in a state where they are spaced apart from each other, so that the motor 7 and the encoder 6 are integrated. It is connected.

A bearing holding portion 2aA formed at the center of one end 2a of the motor 7 is guided into a through hole 8b formed at the center of the encoder base 8, and a heat insulating support portion 2aA formed at the center of one end 2a of the motor 7 is guided into a through hole 8b formed at the center of the encoder base 8. The inner surface of the dustproof seal ring 18 is joined to the outer surface of the bearing holding portion 2aA.

The rotary shaft 4 of the motor 7 is guided so as to protrude into the encoder 6, and a holder 12 is attached to the tip of the rotary shaft 4.
A rotary disk 12 having a slit (not shown) is integrally attached through the encoder base 8, and a signal generating section 16 consisting of a light emitting source is mounted on the encoder base 8 in such a manner that the rotary disk 12 is sandwiched therebetween. , a signal receiving section 14 consisting of a light receiving element is provided.

An encoder casing 15 having a cylindrical shape is attached to the outer periphery of the encoder base 8, and inside the encoder casing 15 there is an encoder having an IC and the like for processing signals from the signal receiving section 14. A circuit board 16 is fixedly disposed.

The motor-connected encoder device according to the present invention is constructed as described above, and its operation will be explained below.

First, when the motor 7 operates and the rotor 3 rotates, the rotating disc 12 attached to the tip of the rotating shaft 4 simultaneously rotates, and light from the signal generator 13 passes through a slit (not shown) in the rotating disc 12. The signal is then input to the signal receiving section 14,
The signal is processed by an IC circuit (not shown) of the encoder circuit board 16, and the rotation angle, rotation speed, etc. of the motor 7 can be detected.

Furthermore, since the gap W exists, the heat generated by the motor 7 is only transmitted to the encoder B via the connecting body 5a and the rotating shaft 4, and the heat generated by the motor 70 is not effectively transmitted to the encoder 6. is prevented.

It should be noted that the shapes of each part in this embodiment are shown as examples, and it goes without saying that slight changes are within the scope of the present invention.

g0 Effects of the Invention Since the motor-connected encoder device according to the present invention has the above-described configuration and operation, it can effectively prevent the heat generated by the motor from being directly transmitted to the encoder, and save labor. It is possible to prevent damage to ICs and the like on the encoder circuit board in the coder.

Also, the gap formed between the motor and encoder
Since a sufficient effect can be obtained even if the encoder is small, the overall shape in the axial direction can be shortened, and effects such as a compact motor-connected encoder device can be obtained.

[Brief explanation of drawings]

FIG. 1 is a side view, partially in section, showing a motor-connected encoder device according to the present invention, and FIGS. 2 to 5 are side views, partially in cross-section, showing a conventional motor-connected encoder device. 1 is a stator, 2 is a motor case, 4 is a rotating shaft, 7 is a motor, 8 is an encoder base, 12 is a rotating disk, 1
3 is a signal generator, 14 is a signal receiver, 16 is an encoder circuit board, and W is a gap.

Claims (5)

[Claims] (1) A motor (7) having a rotating shaft (4) protruding outward from one end (2a) of a motor case (2) having a stator (1), and a required air gap (W) at the one end (2a). an encoder base (8) which is fixed through the rotary shaft (4) and through which the rotary shaft (4) rotatably passes;
4), and a signal generating section (13) disposed corresponding to the rotating disk (12).
) and a signal receiving section (14), and the encoder base (
8), and an encoder circuit board (16) disposed within the encoder case (15), and the encoder circuit board (16) is provided in the encoder case (15) through the gap (W). A motor-connected encoder device characterized in that heat transfer to a substrate (16) is prevented. (2) The one end (2a) and the encoder base (8)
2. The motor-connected encoder device according to claim 1, wherein the motor-connected encoder device is screwed through a collar member (17). (3) The motor-connected encoder device according to claim 2, wherein the collar member (17) is made of a heat insulating material. (4) The motor-connected encoder device according to any one of claims 1 to 3, wherein the encoder base (8) is made of a metal material. (5) The one end (2a) and the encoder base (8)
A motor-connected encoder device according to any one of claims 1 to 4, characterized in that a dust-proof seal ring (18) is interposed between the motor-connected encoder device and the dust-proof seal ring (18).