JPS6314283B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a reflective encoder for a coreless motor that converts a rotational position change, which is an analog signal, into a digital signal. The purpose is to provide an encoder.

FIG. 6 shows a conventional example of this type of reflective encoder.

is an encoder plate with reflective protrusions arranged in parallel around the entire circumference.

is an index slit, which is made up of slits that correspond to reflective protrusions arranged in parallel.

is a light emitting element which irradiates the rotating encoder plate 1 with projected light through a slit, and takes the reflected light from the reflective protrusions back into the light receiving element through the slit. In this way, the rotational position of the encoder plate 1 and, by extension, the rotational speed of the motor connected to the encoder plate 1 can be measured based on the number of reflected lights taken in and the like.

However, in the conventional reflective encoder as shown in FIG. 6, the index slit 3, the light receiving element, etc. are arranged in a stacked manner on the top surface, and when attached to the motor, the encoder is protruded from the end of the rotor's rotating shaft. The disadvantage is that the finished product is bulky in the direction of the rotation axis.

This invention aims to eliminate the above drawbacks, and its gist is to fit an inner cylindrical coil 11 and an outer cylindrical coil 12 formed by coil wires 1 of equal length arranged in parallel. When combined, the binding material 32 is spread across the overlapping portions of the coil wires 1 that overlap in the radial direction, and they are sequentially joined to form an electrically closed loop, and the end face of the coil unit is formed into a reflective surface with a reflective protrusion formed by the binding material. This is a reflective encoder consisting of .

The present invention will be explained below based on an embodiment shown in FIGS. 1 to 5.

16, as shown in FIGS. 4 and 5, an inner cylindrical coil 11 and an outer cylindrical coil 12 formed by coil wires 1 of equal length arranged in parallel are fitted and combined, and overlapped in the radial direction. Coil wire 1
This is a coil unit of a ironless core type armature in which the overlapping parts of the coil unit 16 are successively joined with a binding material 32 to form an electrically closed loop.
As shown in the figure, a commutator 17 and a shaft 18 are fixed to form a coreless armature. FIG. 3 is an enlarged perspective view of section A in FIG. 2, in which the coil wire 1 and the commutator segment 19 are connected with solder 20.

The binding material 32 is made of aluminum, copper wire, or the like, and has a rectangular cross section.

The binding material 32 overlaps the end face of the coil wire 1 in the radial direction. It is spread between the inner cylindrical coil 11 and the outer cylindrical coil 12. The bonding material 32 is bonded to the coil wire 1 by, for example, irradiating both ends thereof with a laser beam, soldering, or the like. It is desirable that the bonding material 32 has the same length in order to function as a reflective protrusion.

In order for the coil unit 16 to form one electrically closed loop in which the coil wires 1 of the inner cylindrical coil 11 and the outer cylindrical coil 12 as described above are continuous, it is necessary, for example, to satisfy the following conditions. It is.

That is, the number of coil wires 1 forming the inner cylindrical coil 11 and the outer cylindrical coil 12 is the same,
The inner cylindrical coil 11 and the outer cylindrical coil 12 should be arranged in parallel on the cylindrical surface without overlapping.
When fitting, it is necessary that each coil wire 1 of the outer cylindrical coil 12 overlaps with each coil wire 1 of the inner cylindrical coil 11 in the radial direction at each end.

When the coil wire 1 is twisted in opposite directions to form the inner cylindrical coil 11 and the outer cylindrical coil 12, and when these are combined and fitted, the coil wire 1 of the inner cylindrical coil 11 is Cylindrical coil 1
The two coil wires 1 are not arranged point-symmetrically, but are fitted so that the coil wires 1 are shifted by one length at one end.

At the end of the coil unit, the coil wires 1 of the inner cylindrical coil 11 and the outer cylindrical coil 12 overlap in the radial direction, and each coil wire 1
are arranged in parallel in the circumferential direction at a constant pitch, so the bonding materials 32 on the end faces are also arranged at a constant pitch in the circumferential direction of the coil unit, and the upper end faces form reflective surfaces. Thus, the end face of the coil unit becomes a reflective surface, and the bonding material 32 becomes a reflective protrusion. In this case, if the upper surface of the bonding material 32 is made to be a rectangular plane of uniform size as in this embodiment, the function of the reflective plate as a reflective protrusion will be improved. Furthermore, if chrome plating or nickel plating is applied to the top surface, it will become a mirror surface and will also prevent fogging and rust, making it even more effective.

Reference numeral 7 denotes an index slit arranged corresponding to the bonding material 32 on the end face of the coil unit 16, which is a reflective surface, and a light emitting element 5 and a light receiving element 6 are arranged so as to correspond to the index slit 7. ing.
Generally, a light emitting diode is used as the light emitting element 5, and a phototransistor is used as the light receiving element 6.

The light emitted from the light emitting element 5 passes through the index slit 3 to the connecting member 3 which is a reflective protrusion.
2, and is received by the light receiving element 5 again via the index slit 3. In this way, when the index slit 3 and the reflective protrusion 2 correspond to each other, the number of times the reflected light is received by the light receiving element 5 is measured and the rotational displacement is detected.

As described above, according to the present invention, the bonding material 32 on the end face of the coil unit of the coreless motor functions as a reflective protrusion of the encoder plate, so that the coreless motor equipped with an encoder can be miniaturized.

[Brief explanation of the drawing]

1 to 5 are perspective views, and FIG. 3 shows an enlarged view of section A in FIG. 2. FIG. 6 is a perspective view showing a conventional example.

Claims (1)

[Claims] 1. An inner cylindrical coil 11 and an outer cylindrical coil 12 formed by coil wires 1 of equal length arranged in parallel are fitted and combined, and a binding material 32 is applied to the overlapping portion of the coil wires 1 that overlap in the radial direction. A reflective encoder in which the end face of the coil unit is made of a reflective surface with reflective protrusions made of a bonding material, which is formed by sequentially bonding the coil unit to form an electrically closed loop.