JPH022059Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a motor rotor that reduces the size and thickness of the motor and also makes it possible to easily solder the commutator terminal part and the electrode terminal of the spark extinguishing circuit board. It is something.

A rotor of a conventional motor, particularly a small flat coreless motor, is explained in FIGS. 1 and 2.

As shown in FIGS. 1 and 2, the rotor 1 of the conventional flat coreless motor has three generally fan-shaped coils 2 with a space in the center arranged at equal angles, and a rotating shaft 3 arranged in the center. It is integrally molded with synthetic resin 4 into a circular shape. The circular synthetic resin 4
A spark extinguishing circuit board 5 for absorbing and extinguishing inconvenient sparks generated during rotation of the rotor 1 is fixed to the surface of the rotor 1 with an adhesive. Furthermore, a cylindrical commutator 6 is attached to the rotating shaft 3. The inside of the commutator 6 is a synthetic resin part 7 consisting of a cylindrical part 7a and a collar part 7b connected to the cylindrical part 7a. is fixed.

The commutator piece 8 is composed of an inner metal layer 9 in contact with the synthetic resin part 7 and an outer noble metal layer 10, and the outer peripheral surface of the noble metal layer 10 parallel to the rotation axis 3 serves as a sliding surface. .

Further, an extension part 8a is formed on the lower side of the commutator piece 8, and is bent in the opposite direction to the rotating shaft 3, so as to follow the flange part 7b of the synthetic resin part 7, and to protrude from the flange part 7b. has been done.

Incidentally, the tip portion of the extension portion 8a positioned above the electrode terminal 5a of the spark extinguishing circuit board 5 serves as a commutator terminal portion 8b.

Further, the width dimension of the commutator piece 8 is formed to be substantially the same over the entire commutator piece 8, and the commutator terminal portion 8b is formed too large for a terminal portion to be attached to a ridge. .

However, in the case of the rotor of the motor as described above, the commutator 6 has a complicated structure in which the extension part 8a protrudes in the opposite direction to the rotating shaft 3.
Therefore, the workability in manufacturing the commutator is poor, causing high manufacturing costs. Further, since the axial dimension of the rotating shaft 3 of the rotor 1 is large, and the commutator terminal portion 8b which is soldered to the electrode terminal 5a of the spark extinguishing circuit board 5 is provided outside the sliding surface, the rotor 1 The radial direction of the motor is also large, making it impossible to make the motor smaller and thinner.

Further, in the commutator terminal portion 8b formed to be large as described above, when soldering the commutator terminal portion 8b and the electrode terminal 5a of the spark extinguishing circuit board 5, the commutator terminal portion 8b is heated to a temperature at which the solder melts. Due to the large amount of heat required to raise the
The drawback was that soldering work could not be done quickly.

The present invention is intended to eliminate the drawbacks of the prior art, and its purpose is to simplify and miniaturize the structure of the commutator, and furthermore, to solder the commutator terminal part and the electrode terminal of the spark extinguishing circuit board. An object of the present invention is to provide a rotor for a motor that can be quickly worked.

In order to achieve this object, the present invention includes a synthetic resin part having a cylindrical shape through which a rotating shaft is inserted, a plurality of commutator pieces fixed to the outer periphery of the synthetic resin part, and a commutator terminal part of the commutator pieces. In the rotor of the motor, the synthetic resin part is formed in a cylindrical shape having approximately the same outer diameter over the entire length, and the commutator terminal part is connected to the commutator piece. The width of the narrow commutator terminal is made smaller than the width of other parts, and a space is provided inside surrounded by each commutator terminal, and the end face of the narrow commutator terminal is brought into contact with the electrode end of the spark quenching circuit board. It is characterized by being soldered so that they touch each other.

Hereinafter, one embodiment of the rotor of the motor of the present invention will be described in detail with reference to FIGS. 3 to 5.

11 is a rotor of a flat coreless motor;
2 is a commutator of the rotor 11. The inside of this commutator 12 is a cylindrical synthetic resin part 13 having an approximately equal outer diameter over its entire length.
A shaft hole 13a through which a rotating shaft 14 is inserted is bored in the center of the synthetic resin portion 13, and a plurality of commutator pieces 16 are fixed to the outer peripheral surface of the shaft hole 13a through grooves 15. Each commutator piece 16 has a two-layer structure with a metal layer 17 on the inside and a noble metal layer 18 on the outside, and the commutator piece 16 is formed in a straight line from its upper end to its lower end.

Further, the commutator terminal portion 16a at the lower end of the commutator piece 16 extends from the synthetic resin portion 13 in the axial direction of the rotating shaft 14, and is formed so that its width dimension is smaller than other parts of the commutator piece 16. ing.

Then, the commutator 12 shown in FIG. 5 is fitted onto the rotating shaft 14, three substantially fan-shaped coils 20 are arranged at equal angles, and the rotating shaft 14 is arranged in the center.
The lead wire of each coil 20 is connected to the circuit board 1 for extinguishing sparks.
After soldering to the other electrode terminal of 9, synthetic resin 2
1 is integrally molded into a circular shape.

Then, while the commutator terminal portion 16a is in contact with the solder applied to the electrode terminal 19a on the spark extinguishing circuit board 19, the commutator terminal portion 16a
The commutator terminal portion 1 is melted by heating the solder by laser irradiation or the like.
6a and the electrode terminal 19a are soldered to complete the rotor 11.

Reference numeral 13b denotes a space, and this space 13b is formed by not providing the synthetic resin part 13 inside the space surrounded by the commutator terminal parts 16a. Therefore, there is no synthetic resin part 13 directly inside each commutator terminal part 16a, making it difficult for heat to escape.

With the above configuration, according to the present invention, the shape of the synthetic resin portion to which the commutator piece is fixed to the outer periphery is cylindrical with approximately the same outer diameter over the entire length, thereby making the commutator piece linear. This simplifies the structure of the commutator, which simplifies the manufacturing process of the commutator, requires fewer manufacturing steps, and therefore reduces manufacturing costs. Since it can be placed closer to the rotating shaft than in the past, the outer diameter of the circular synthetic resin is smaller, making the rotor more compact.Furthermore, the spark extinguishing circuit board is insert-molded with the synthetic resin, making the rotor smaller. This has the effect of making the motor thinner and, in turn, making it possible to make the entire motor smaller and thinner.

Furthermore, the width of the commutator terminal part is smaller than the other parts of the commutator piece, and since there is no synthetic resin part inside the commutator terminal part and it is a space, it quickly reaches the temperature at which the solder melts even with a small amount of heat. This has the effect that soldering work can be done quickly.

Furthermore, since the commutator terminal portion is formed to be smaller in width than the other portions of the commutator piece, the portion that comes into contact with the pattern of the spark extinguishing circuit board becomes smaller, so that the entire motor can be made smaller.

[Brief explanation of the drawing]

Fig. 1 is an overall perspective view of the rotor of a flat coreless motor as a conventional example, Fig. 2 is a sectional view along the line of Fig. 1, and Fig. 3 is an entire rotor of a flat coreless motor showing an embodiment of the present invention. 4 is a sectional view taken along the line of FIG. 3, and FIG. 5 is a perspective view of a commutator constituting one embodiment shown in FIG. 3. 11... Rotor of flat coreless motor, 12...
...Commutator, 13...Synthetic resin part, 14...Rotating shaft, 16...Commutator piece, 16a...Commutator terminal part, 19...Spark extinguishing circuit board, 19
a... Electrode terminal.

Claims (1)

[Scope of utility model registration request] A synthetic resin part having a cylindrical part through which a rotating shaft is inserted, a plurality of commutator pieces fixed to the outer periphery of the synthetic resin part, and a spark extinguishing circuit board electrically connected to the commutator terminal parts of the commutator pieces. In the motor rotor, the synthetic resin part is formed into a cylindrical shape having a substantially equal outer diameter over the entire length, and the commutator terminal part is formed to be smaller in width than the other part of the commutator piece, A motor characterized in that a space is provided inside surrounded by each commutator terminal part, and an end face of the narrow commutator terminal part is soldered so as to come into contact with an electrode end of the spark extinguishing circuit board. rotor.