JPH04263Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an improvement of a device for detecting the rotational position of a rotor in a small motor.

[Summary of the invention] The present invention is a small motor that detects the rotational position of the rotor by detecting the slit of an encoder disk that rotates together with the motor rotor using a photoelectric sensor installed on a stationary member of the motor. , a photoelectric sensor is provided directly on the side plate of the motor facing the encoder disk, and an adjustment groove is cut in the side plate surrounding the vicinity of the photoelectric sensor, leaving a narrow communication portion, and a portion surrounded by the adjustment groove is cut in the side plate. of,
The position of the photoelectric sensor can be adjusted by displacing it.

[Prior Art] Conventionally, to adjust the position of a photoelectric sensor, a dedicated adjustment plate is provided on the side plate of the motor, and after the position adjustment, the adjustment plate is fixed to the side plate with a screw.

[Problems to be solved by the invention] Therefore, the number of parts constituting the position detection device is large, the manufacturing cost is high, and the adjustment position may be deviated due to impact on the adjustment plate due to falling or the like.

[Means for solving the problem] The present invention mounts the sensor directly on the side plate of the motor, leaves a narrow communication part on the side plate and cuts an adjustment groove surrounding the sensor, and the above adjustment groove The above-mentioned problem is solved by displacing the portion surrounded by the photoelectric sensor to adjust the position of the photoelectric sensor.

[Function] In the present invention, even if the sensor is mounted directly on the side plate, the connecting part near the sensor provided on the side plate is narrow, so the part surrounded by the adjustment groove on the side plate can be used with a jig, etc. The position of the sensor can be adjusted by easily displacing the sensor.

[Example of the invention] In Figs. 1 and 2, 1 is a motor, 2 is a case, 3 is a side plate, 4 is a rotor, 5 is a motor shaft, and 6
is a bearing that pivotally supports the motor shaft 5, and on the upper surface of the rotor 4 is an encoder disk 7 that is coaxial with the rotor 4 and has slits (not shown) cut at key points.
is installed.

As shown in FIG. 1, a U-shaped first adjustment groove 8 whose radial end is open is cut into the upper side plate 3.
A second adjustment groove 9 is cut out to surround the outer end of the adjustment groove 8, and as shown in FIG.
A tongue piece 10 facing in the centripetal direction is formed, and the tongue piece 10 and the side plate 3 are connected through a narrow communication part 11.

A mounting groove 12 is cut into the tongue piece 10 from the inner edge, an engagement groove 13 is cut from the peripheral edge, and an engagement hole 14 is bored in the center.
An immovable hole 15 is bored immediately below the hole 4.

The main body 16a of the photoelectric sensor 16 corresponding to the slit of the encoder disk 7 fits into the mounting groove 12 of the tongue piece 10, and the flange 16b of the photoelectric sensor 16 is press-fitted between the side plate 3 and the tongue piece 10. Fixed.

3 and 4 show a jig 17 used for adjusting the above-mentioned device of the present invention, and a square rod-shaped handle 18 has a handle 18 fitted at the lower end thereof to fit into the adjustment hole 14 and the immovable hole 15. A cylindrical protrusion 19 that can be engaged with the adjustment groove 13 is vertically disposed near the cylindrical protrusion 19 that can be engaged with the adjustment groove 13.

As shown in FIG. 5, the device of the present invention described above engages the cylindrical protrusion 19 and the square rod-shaped protrusion 20 of the jig 17 with the engagement hole 14 and the engagement groove 13, respectively, to open the handle 18. If the tongue piece 10 is forcibly rotated as shown by the arrow, the tongue piece 10 will be plastically deformed in the communication part 11 and permanently displaced in any direction, allowing the position of the photoelectric sensor 16 held to be adjusted as desired. .

Note that the present invention does not limit the shapes and numbers of the first and second adjustment grooves 8 and 9, or the shapes and numbers of the engagement grooves 13 and engagement holes 14 to those described above.

[Effects of the invention] In the present invention, the sensor is provided on the side plate, and the position of the sensor is adjusted by displacing the part of the side plate surrounded by the adjustment groove. There is no need for adjustment plates or screws to fix them, the number of parts is reduced, and it can be manufactured at low cost.Also, even if you accidentally drop it, there is no shock as there is no special adjustment plate installed. Therefore, the adjusted position of the sensor will not go out of order.

[Brief explanation of the drawing]

Fig. 1 is a top view of the motor to which the present invention is applied, Fig. 2 is a partially longitudinal side view of the same, Fig. 3 is a side view of the shaft, Fig. 4 is a bottom view, and Fig. 5 shows the adjustment status. FIG. 3 is a partial top view of the encoder disk shown in FIG. 1...Motor, 3...Side plate, 4...Rotor, 7
... Encoder disk, 8 ... First adjustment groove, 9
...Second adjustment groove, 11...Communication section, 13...Engagement groove, 14...Engagement hole, 16...Photoelectric sensor, 17
……jig.

Claims (1)

[Scope of utility model registration request] A sensor installed on a stationary member of the motor detects a slit in an encoder disk that rotates together with the motor's rotor to detect the stopped position of the rotor.In a small motor, a sensor is installed on the side plate of the motor facing the encoder disk. and an adjustment groove is cut in the side plate to surround the vicinity of the sensor, leaving a narrow communication part, so that the part surrounded by the adjustment groove can be displaced. A device for detecting the rotational position of a rotor in a motor.