JPH0617803B2 - Pulse generator - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a pulse generator used for detecting the rotational speed, rotational position, rotational speed, etc. of a rotating object such as a motor.

[Conventional technology]

Generally, a motor is provided with a pulse generator for detecting an actual value of a position or speed for position control or speed control. FIG. 4 shows a conventional general incremental type pulse generator, and FIG.
The figure shows an absolute pulse generator. In the pulse generator shown in FIG. 4, a disc-shaped rotary plate 32 having a large number of slits 31 penetrating from one side to the other side along the circumferential direction and a slit 33 corresponding to a part of the slits 31 are formed. Fan-shaped fixed plate 34
It has and. The rotating plate 32 rotates integrally with an object to be measured (not shown), for example, a rotating shaft of a motor. A light emitting diode 36 functioning as a light source is arranged on one surface side (for example, the motor side) of the rotating plate 32, and a photodiode 35 functioning as a light receiver is arranged on the other surface side (opposite the motor side) of the rotating plate 32. There is. The light emitted from the light emitting diode 36 is reflected by the slit 31 of the rotary plate 32 and the fixed plate 3.
It passes through the slit 33 of 4 and reaches the photodiode 35 as a light pulse. This light pulse is converted into an electric pulse signal by the photodiode 35. By processing this electric pulse signal by a counter (not shown) or the like, it is possible to detect the rotation speed, rotation speed, etc. of the rotating plate 32 (that is, the object to be measured). The pulse generator of FIG. 5 has the same basic structure as that of FIG. 4, but is characterized in that the slit 31 of the rotary plate 32 is formed of a binary code string as illustrated in FIG. It is a thing.

FIG. 7 is a longitudinal sectional view showing a state in which the pulse generator shown in FIG. 4 is structurally integrated. This pulse generator is attached to a rotary shaft 37 connected to the rotary shaft of a motor (not shown). The rotating shaft 37 is inserted into the frame 38 of the pulse generator, and the bearing 3
It is rotatably supported by 9. The rotary plate 32 is attached to the rotary shaft 37 substantially in the center of the frame 38. In the frame 38, the light emitting diode 36 is disposed on one side (for example, the motor side) and the other side (for example, the non-motor side) 38a so as to be positioned with a slight gap on both sides of the rotating plate 32. The fixing plate 34 and the photodiode 35 are disposed in the. Light emitting diode 36
And the photodiode 35 is the slit 3 of the rotary plate 32.
1 is arranged at a radial position corresponding to 1.

[Problems to be solved by the invention]

The conventional pulse generator requires the light emitting diode 36 and the photodiode 35 corresponding to the number of detected pulses such as so-called A-phase pulse, B-phase pulse, and Z-phase pulse. Therefore, the number of parts is large and the structure is complicated. Further, since the light emitting diode 36, the rotary plate 32, the fixed plate 34, and the photodiode 35 are arranged along the axial direction of the rotary shaft 37, the axial dimension of the detection unit in which the pulse generator is housed becomes long. That is, as shown in FIG. 8, the axial length of the pulse generator 41 occupies a large proportion of the axial length of the motor 40 having the rotary shaft 37, resulting in an increase in size of the motor. There was an inconvenience.

The present invention has been made in consideration of the above circumstances,
An object of the present invention is to provide a pulse generator capable of reducing the number of parts and downsizing the device.

[Means for solving problems]

In order to achieve the above object, the pulse generator of the present invention has a central through hole, and the light guiding slit is at least 1 when viewed in the circumferential direction so as to penetrate in the radial direction from the inner peripheral surface and pass through to the outer peripheral surface. A plurality of rotary plates that are formed at a location and rotate together with the DUT, a common light source that is fixedly arranged in the center through holes of these rotary plates, and each rotary plate so as to face the outer peripheral surface of the rotary plate. And a plurality of light receivers that are fixedly arranged and that receive an optical pulse signal emitted from a light source and transmitted through each light guide slit and convert the optical pulse signal into an electric pulse signal.

(Operation) According to the above configuration, the light source is arranged in the center through hole of the rotating plate, and the light receiver is arranged so as to face the outer peripheral surface of the rotating plate, thus achieving the intended function as the pulse generator. At the same time, a so-called flat type pulse generator having a small axial dimension can be achieved by using only one light source.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a vertical sectional view of an embodiment of the present invention, and FIG. 2 is a partial perspective view of the rotary plate thereof. This embodiment shows a pulse generator applied as a detection part of a motor. A housing is constituted by both end plates 2 and 3 and a cylindrical frame 5, and a cavity 6 is formed inside the housing. The rotary shaft 1 coupled to the rotary shaft 37 of the motor 40 (see FIG. 3) penetrates the end plate 2 on the motor 40 side to reach the inside of the cavity 6, and is rotated by the bearing 4 mounted on the end plate 2. Supported as possible. The tip portion of the rotary shaft 1 is configured as an annular flange portion 1a extending in a radial direction orthogonal to the axial direction, and the flange portion 1a has a circular through hole similar to the central through hole thereof. The two rotating plates 7 and 8 are attached in an axially overlapping manner. Of these two rotary plates 7 and 8, the rotary plate 7 located on the flange portion 1a side is for detecting the A-phase pulse and the B-phase pulse, and the rotary plate 8 located on the opposite flange portion side is It is for detecting the origin pulse. Each of the rotary plates 7 and 8 has a plurality of slits formed therein, and the slits 9 are formed so as to radially penetrate from the inner peripheral surface of the central through hole of the rotary plates 7 and 8 and to the outer peripheral surface. Has been done.

FIG. 2 is a partial perspective view of the rotary plate 7. As described above, the slit 9 is formed so as to penetrate from the inner peripheral surface of the center through hole of the rotary plate 7 in the radial direction and to the peripheral surface 7a on the outer peripheral side. Has a slit 9 open. Although not shown, the rotary plate 8 has the same structure as the rotary plate 7.

As shown in FIG. 1, by forming the openings of the slits 9 on the inner peripheral surface and the outer peripheral surface of the rotary plate 7, the rotary plate 7 can be supported by a wide plate surface, and the rotational shake of the rotary plate 7 can be prevented. Can be made smaller. Here, each rotary plate 7,
Reference numeral 8 is an annular shape with a punched out central portion, and a light source 10 is provided so that the light emitting portion is positioned at the opening of each slit by utilizing the punched portion, that is, the central through hole. The light source 10 is, for example, a light emitting diode, and is fixed to the central portion of the end plate 3. The light source 10 is a common light source for the slits of both rotary plates 7 and 8. With such a structure, it is possible to obtain various measurement pulses corresponding to the number of rotary plates by a single light source. Becomes Fixed plate 11 corresponding to the slits of the rotary plates 7 and 8
And the light receiver 13, and the fixed plate 12 and the light receiver 14.
Are attached to the frame 5, respectively. Fixed plate 11
The light receiver 13 is provided for the rotating plate 7, and the fixed plate 12 and the light receiver 14 are provided for the rotating plate 8. In that case, if the fixing plate 11 and the light receiver 13 and the fixing plate 12 and the light receiver 14 are attached to different circumferential positions of the frame 5 as shown in the drawing, the assembly is easy and the axial dimension is small. A “flat type” pulse generator can be obtained. The light receivers 13 and 14 are composed of photodiodes or the like, and are inserted into insertion holes formed so as to penetrate the frame 5 in the radial direction.

Although not shown, the fixed plates 11 and 12 are formed with slits corresponding to the slits of the rotary plates 7 and 8 (see FIG. 4 or FIG. 5). With the rotation of the rotary plates 7 and 8, after passing through those slits and the slits of the respective fixed plates 11 and 12, the light receiver 13,
14 arrives as a light pulse, and the light pulse is converted into an electric pulse signal and output. By processing the electric pulse signal by a signal processing means (not shown), for example, a counter, it is possible to detect the rotation speed, rotation position, rotation speed, etc. of the rotary shaft 1.

According to the embodiment configured as described above, the single light source 1
It is possible to obtain various kinds of measurement pulses according to the number of attached rotary plates under the condition that the number of components is as small as zero. Maintenance work is easy because the number of parts is small. In addition, the rotary plate 7,
8 slit openings are located on the inner and outer peripheral surfaces thereof, and the light source 10 and the light receivers 13 and 14 are arranged at the same axial positions as the rotary plates 7 and 8, respectively, so that a flat type pulse generator is configured. can do.

FIG. 3 is a side view showing a state in which the pulse generator 16 constructed according to the embodiment of FIG. 1 is attached to the motor 15 having the rotary shaft 1. Pulse generator 16
Indicates that the pulse generator 16 occupies a small proportion in the axial direction with respect to the motor 15, and the overall size is reduced.

The pulse generator of the present invention can be used by being attached not only to a motor but also to various rotating machines or rotating objects.

〔The invention's effect〕

As described above, according to the present invention, the slits of the plurality of rotary plates are formed so as to penetrate from the inner peripheral surface in the radial direction to the outer peripheral surface, and the common light source is arranged in the center through hole of the rotary plate. Since a plurality of light receivers are provided facing the outer peripheral surface of the rotary plate, a flat type pulse generator that can generate various measurement pulses, has a small number of parts, and has a simple structure can be configured. it can.

[Brief description of drawings]

1 is a longitudinal sectional view of an embodiment of the present invention, FIG. 2 is a partial perspective view of the rotary plate of FIG. 1, and FIG. 3 is a side view showing a state in which the pulse generator of the present invention is attached to a motor. 4 and 5 are perspective views showing the principle configuration of a conventional different type pulse generator, FIG. 6 is a partial front view of the rotary plate in FIG. 5, and FIG. 7 is a pulse generator of FIG. FIG. 8 is a vertical sectional view showing an assembled state, and FIG. 8 is a side view showing a state in which a conventional pulse generator is attached to a motor. 1 ... Rotary shaft, 2,3 ... End plate, 4 ... Bearing, 5 ... Frame, 7,8 ... Rotating plate, 9 ... Slit, 10 ...
Light source, 11, 12 ... Fixed plate, 13,14 ... Receiver.

Claims (1)

[Claims] 1. An object to be measured, each of which has a central through hole and is formed with at least one slit for light guiding so as to penetrate in the radial direction from the inner peripheral surface and exit to the outer peripheral surface when viewed in the circumferential direction. A plurality of rotating plates that rotate together, a common light source fixedly arranged in the center through holes of these rotating plates, and a fixed arrangement for each rotating plate so as to face the outer peripheral surface of the rotating plate. And a plurality of light receivers for receiving the optical pulse signals emitted and transmitted through the respective light guiding slits and converting the optical pulse signals into electric pulse signals.