JP2002064966A - Small-size coreless motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the assembly efficiency of a small-size coreless motor by employing the wire connection structure which enables a neutral wiring without using floating wirings even if a star-connection (Y-connection) is used. SOLUTION: In a small-size coreless motor with magnet wire coils using a star-connection, neutral rings 11a and commutator terminals 10a separated electrically from each other are provided in a rotor holder and neutral coil terminals 12a and commutator coil terminals 12b are connected respectively to the neutral rings 11a and the commutator terminals 10a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a small motor used in a cellular phone or the like, and more particularly, to a star connection (Y connection) which has a large coil wire diameter of a rotor portion and is advantageous for reducing current. The present invention relates to a small coreless motor that adopts a method for simplifying connection processing of a coil terminal serving as a middle point and connection between a commutator terminal and a coil terminal.

[0002]

2. Description of the Related Art Conventionally, a delta connection method and a star connection (Y connection) method are generally known as connection methods for winding coils of a motor. In the star connection (so-called Y connection) method, the connection processing at the midpoint (common) is more difficult than in the delta connection method, and the wiring work must be performed in the aerial part, and the quality is stable. The work is difficult, and technically, the delta connection method having relatively good workability is often employed.

[0003] For example, it is essential that a vibrating coreless motor equipped with a half moon-shaped small eccentric weight is incorporated in a vibrator function driving portion of a mobile phone. These coreless motor sections generally employ the above-mentioned delta connection type cylindrical commutator in which all winding coil terminals are connected to the commutator. FIG. 5 and FIG. 6 described below are explanatory views showing a configuration employing the delta connection method in a rotor section of a conventional small coreless motor. FIG. 5 is a schematic view of the rotor end viewed from the axial direction, and FIG.
FIG.

In each of the drawings, reference numeral 1 denotes a coil terminal of a tap wire drawn from an end of a cylindrical winding coil main body, and reference numeral
2 is a connection portion for conducting connection between the commutator and the coil terminal, 3 is a winding coil body wound in a hollow cylindrical shape,
Reference numeral 4 denotes an arc (curvature) commutator serving as a sliding contact portion between the connection portion 2 and a conductive unit brush, and reference numeral 5 denotes a shaft serving as a rotation output central axis of the motor.

[0005] In this conventional delta connection type coreless motor, the extracted coil wire (tap wire) is twisted and collected as two coil terminals 1 in the air at the end of the winding coil.
The connection is fixed to the connection portion 2 integral with the commutator 4 by soldering. For reference, FIG. 7 shows the internal structure of a general cylindrical coreless motor including the rotor section. The drive voltage of this vibration motor is usually 1.5 V specification.

[0006]

In recent years, coreless motors mounted on mobile phones and the like have been reduced in diameter and length to meet the demands for miniaturization and power saving of mobile devices, and have been reduced to a diameter of φ4 mm or less. Is being transformed. In order to realize such a small diameter and small size and power saving, when a proper and sufficient characteristic is obtained by the conventional delta connection method, the coil wire diameter is φ
The diameter had to be very small, about 0.03 to 0.04 mm, which caused the wire efficiency and yield to be significantly reduced in the winding process, such as disconnection and short circuit.

[0007] Therefore, it is strongly required to adopt a star connection system which can provide the same characteristics as the delta connection system, and which can cause disconnection or short-circuiting which is a problem with extra-fine wires, and which can make the coil thicker which is advantageous for power saving. Have been. In other words, increasing the coil wire diameter has the advantages that the above-mentioned disadvantages in the winding step are eliminated, and that the resistance value R increases and the current consumption I decreases.

However, if the star connection method is adopted for a small coreless motor, the coil terminals must be twisted in the aerial part to be integrated into one, and the aerial wiring must be performed by connecting it to the commutator terminal part. There is a problem that the working efficiency is not improved, and productivity is improved and the yield is hindered.

The present invention has been made in view of the above, and it is possible to easily perform midpoint wiring without performing aerial wiring even in the star connection (Y connection) system, which is considered difficult. It is an object of the present invention to remarkably improve work efficiency by adopting a rotor core connection structure of a small coreless motor.

[0010]

According to a first aspect of the present invention, there is provided a small coreless motor according to the first aspect, wherein the small coreless motor uses a star-connected winding coil. And a conductive midpoint ring that is electrically separated from the commutator terminal and connects each coil end of the winding coil tap wire that is the midpoint of the star connection.

According to the present invention, the conductive midpoint ring is disposed on the side surface of the rotor portion, for example, a part of the disk-shaped support (coil holder) at the end of the cylindrical winding coil, and the midpoint of the star connection (common). Part) to the conductive midpoint ring part,
By connecting the coil terminals collectively, the aerial wiring processing, which has conventionally been a troublesome work process, becomes unnecessary, and the coil terminal processing can be simplified and further automated.

Further, in the small coreless motor according to the present invention, the conductive midpoint ring has a substantially ring shape of a thin plate, and serves as a land portion for soldering or the like in an arrangement corresponding to each coil terminal. A partial connection space is provided. In addition to a thin ring shape, a shape in which conductive portions are connected in a circle, such as a through-hole wiring board, may be used.

According to the present invention, in the first aspect, for example, the ring-shaped corresponding coil terminals are substantially matched with three coil terminals protruding in the inner diameter direction at equal distribution intervals of approximately 120 degrees in a star connection. Providing three places and securing a sufficient space for connecting the coil terminals facilitates alignment work in the rotational direction and electrical connection processing such as soldering or spot welding, or mechanically. Can be automated.

Further, in the small coreless motor according to the third aspect, the conductive midpoint ring is formed of a highly conductive material such as phosphor bronze having a small electric resistance or a conductive plated plate. Things.

According to the present invention, the ring material itself can be obtained by simple processing by forming the conductive midpoint ring from phosphor bronze or a conductive plated plate having a small electric resistance. In addition, the shape is simple, and it is possible to quickly respond to a shape change.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a small coreless motor according to the present invention will be described below in detail with reference to FIGS. Although the present invention has been described as this embodiment, the present invention is not limited to this embodiment, and includes all the same components in terms of shape and structure.

Here, for example, a small coreless motor used as a vibration motor for driving a vibrator when a manner mode of a mobile phone is set will be described as an example.

FIGS. 1 and 2 are explanatory views showing the configuration of a cup-shaped rotor in a small coreless motor according to an embodiment of the present invention. FIG. 1 is a structural view of the rotor section viewed from one axial side, and FIG. 2 is an external view of the rotor section viewed from the axial side direction. FIG. 3 is an explanatory diagram showing a cross-sectional configuration of the coreless motor according to the embodiment of the present invention shown in FIG. 2 on the rotor unit side.

The winding coil of this small coreless motor is:
It has a structure using a star connection (Y connection) method.
The center point (common portion) of the star connection (Y connection) inside the motor is provided at one end of the rotor, and each connection processing is performed.

In each of the drawings, reference numeral 10 denotes a commutator of a contact sliding portion, reference numeral 10a denotes a commutator terminal of a connection portion, and reference numeral 11 denotes a characteristic part of the present invention having a shape and function as described later. Point ring, reference numeral 11a denotes a midpoint ring connection portion provided on the midpoint ring 11, reference numeral 12 denotes a hollow cylindrical winding coil held by a holder 15, reference numeral 12a denotes a midpoint coil of the cylindrical winding coil 12. The terminal, reference numeral 12b denotes a commutator coil terminal of the cylindrical coil 12, reference numeral 13 denotes a central shaft serving as a rotation output shaft, and reference numeral 14 denotes an insulating cylindrical body integral with a holder 15 for insulating each of the commutators 10.

The midpoint ring 11 has a thin plate ring shape as shown in the figure, and has three connection portions (120 degrees apart in shape) such that the midpoint (common portion) is connected to the coil terminal. Swells in the inner area (wiring space)
Is provided. The midpoint ring 11 has a small electric resistance. For example, a conductive thin plate material such as a copper plate or a phosphor bronze plate is formed by press punching or the like as a current-carrying component. Processing may be performed.

Next, the connection procedure of the small coreless motor configured as described above will be described. FIG. 4 is an actual coil wiring diagram according to the embodiment of the present invention. First, the midpoint ring 11 for connecting the midpoint (common) portion of the star connection is disposed at the rotor end portion electrically separated from the commutator terminal 10a. At this time, since the midpoint ring 11 is provided with the midpoint ring connection portions 11a corresponding to the three midpoint coil terminals 12a, each of the midpoint ring connection portions 11a matches the midpoint coil terminal 12a. Place and fix in position.

Thereafter, the midpoint ring connection of the midpoint ring 11
By connecting the coil terminal 11a and the coil terminal 12a for the middle point by soldering or spot welding, and further connecting the commutator terminal 10a and the coil terminal 12b for the commutator with the same solder, a rotor part star connection as shown in FIG. 4 is realized. .

Therefore, as described above, the midpoint (common) portion of the star connection is connected in the shape and arrangement of the midpoint ring 11 so that the midpoint portion is twisted and connected in the air (space portion). It is not necessary to perform so-called aerial wiring troublesome work, and it is not necessary to provide a space for the aerial wiring. In particular, as the motor becomes extremely small in diameter, the wiring structure using the midpoint ring 11 becomes more effective in assembling. That is, in adopting the star connection, the connection processing of the coil terminal is easy and the aerial wiring is not required, so that the production efficiency is improved.

[0025] In addition, since the star connection allows the use of a thick wire coil wire as compared with the conventional one, the occurrence of troubles such as disconnection or short circuit in the wiring work can be reduced, and the electric resistance can be increased. The current consumption is reduced accordingly. Therefore, it can be mounted on a small information device, such as a mobile phone, for which small size and low power consumption are strongly required. Furthermore, by this star connection, it corresponds to the voltage specification of the secondary battery of the mobile phone.
For example, it is possible to design a circuit of 3v specification.

In this embodiment, the rotor of a small vibrating coreless motor used in a cellular phone or the like has been described as an example. In addition, for example, an ultra-small coreless motor used in a small medical device or the like may be used. The present invention can be applied to, for example, but is not limited thereto.

[0027]

As described above, according to the small coreless motor according to the present invention (claim 1), the conductive midpoint ring for connecting to each coil terminal is arranged on the side of the rotor, By connecting each coil terminal, which is the midpoint (common part) of the star connection, to the midpoint ring, the aerial wiring processing of the midpoint part, which was a troublesome wiring process in the past, becomes unnecessary, and the coil terminal processing during assembly Can be easily performed, the work time of the terminal processing is reduced, and as a result, the production efficiency and the yield can be improved.

Further, according to the small coreless motor according to the present invention (claim 2), the ring-shaped motor according to claim 1 is formed so as to match with three coil terminals which are provided at intervals of approximately 120 degrees in the star connection. By securing the space for connecting the coil terminals at three places on the inner diameter side of
Since electrical connection work such as alignment, soldering, and spot welding can be easily and reliably performed, workability of the entire coil terminal processing as well as the connection of the midpoint portion is improved.

According to the small coreless motor according to the present invention (claim 3), the conductive midpoint ring according to claim 1 or 2 can be manufactured by punching copper or phosphor bronze having a small electric resistance. Therefore, the midpoint ring itself can be obtained on a mass-production basis as a very simple and low-cost part, so that it is possible to cope with mass production without increasing the cost. Furthermore, since it is a simple shape,
Even if a material change or the like occurs, the design can be changed quickly.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a configuration of a connection portion of a cup-shaped rotor in a small coreless motor according to an embodiment of the present invention.

FIG. 2 is a diagram illustrating a side appearance configuration of the small coreless motor according to the embodiment of the present invention;

FIG. 3 is a diagram showing an internal configuration in a side cross section of the small coreless motor according to the embodiment of the present invention;

FIG. 4 is an explanatory diagram showing a configuration of a coil wiring according to the embodiment of the present invention.

FIG. 5 is an explanatory view showing a configuration of a connection portion of a cup-shaped rotor of a small coreless motor having a conventional structure.

FIG. 6 is an explanatory diagram showing a side appearance configuration of a cup-shaped rotor of a small coreless motor having a conventional structure.

FIG. 7 is a side sectional view illustrating the inside of a conventional small cylindrical coreless vibration motor.

[Explanation of symbols]

 10 Commutator 10a Commutator terminal 11 Midpoint ring 11a Midpoint ring connection 12 Winding coil 12a Midpoint coil end 12b Commutator coil end 13 Shaft 14 Insulating cylinder 15 Holder 21 Vibrating coreless motor 22 Eccentric weight 23 Housing 24 Magnet 25 Bearing 26 End cap 27 Brush

Claims (5)

[Claims] 1. A small coreless motor using a winding coil in a star connection, wherein the winding coil is disposed in a rotor portion of the motor, electrically separated from a commutator terminal, and serves as a midpoint of the star connection. A small coreless motor comprising a conductive midpoint ring connecting each coil terminal of a tap wire. 2. The small coreless device according to claim 1, wherein the conductive midpoint ring has a shape of a thin plate ring, and a connection space is provided at a position corresponding to each coil terminal. motor. 3. The small coreless motor according to claim 1, wherein the conductive midpoint ring is made of phosphor bronze or a conductive plated plate having a small electric resistance. 4. The small coreless motor according to claim 1, wherein a driving voltage of the motor is set to a voltage twice as high as a normal driving voltage by installing the conductive midpoint ring. 5. A mobile phone terminal device and a communication device using the small coreless motor according to claim 1.