JP4866985B2 - Small coreless motor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a small motor used in a mobile phone or the like, and more specifically, adopts a star connection (Y connection) system that is advantageous in reducing current by making the coil wire diameter of a rotor portion large, The present invention relates to a small coreless motor configured to simplify the connection processing of the coil terminal and the connection between the commutator terminal portion and the coil terminal.
[0002]
[Prior 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. The star connection (so-called Y connection) method is more difficult to connect at the midpoint (common) than the delta connection method, and the wiring must be done in the air, and the quality is stable. The work is difficult, and technically, the delta connection method with relatively good workability is often used.
[0003]
For example, it is essential that a vibratory coreless motor with a half-moon-shaped small eccentric weight is incorporated in a vibrator function driving portion of a cellular phone. These coreless motor units generally employ the above-described delta-connected cylindrical commutator in which all winding coil terminals are connected to the commutator. FIG. 5 and FIG. 6 shown below are explanatory views showing a configuration employing the delta connection method in the rotor portion of a conventional small coreless motor. FIG. 5 is a schematic view of the rotor end as viewed from the axial direction, and FIG. 6 is a schematic side view of FIG.
[0004]
In each figure, reference numeral 1 is a coil terminal of a tap wire drawn out from the end of the cylindrical winding coil body, reference numeral 2 is a connection part for conducting and connecting the commutator and the coil terminal, and reference numeral 3 is a hollow cylindrical shape. Winded coil body, reference numeral 4 is an arcuate (curvature) commutator that becomes a sliding contact portion between the connection part 2 and the stator part brush that is conductively integrated, and reference numeral 5 is a rotation output central axis of the motor The shaft is shown.
[0005]
The coreless motor of this conventional example of the delta connection method collects the drawn coil wire (tap wire) as two coil terminals 1 in the air at the end of the winding coil, and connects the commutator 4 and the integrated connection portion 2. The connection is fixed by soldering. For reference, FIG. 7 shows a structure inside a general cylindrical coreless motor including the rotor portion. The drive voltage of this vibration motor is normally 1.5V specification.
[0006]
[Problems to be solved by the invention]
2. Description of the Related Art In recent years, coreless motors mounted on mobile phones and the like have become smaller and smaller to a diameter of 4 mm or less due to the progress of smaller and shorter diameters in accordance with demands for downsizing and power saving of portable devices. In order to achieve such a small diameter and small power consumption, when obtaining adequate and sufficient characteristics with the conventional delta connection method, the coil wire diameter must be an extremely small diameter of about 0.03 to 0.04 mm. In the winding process, production efficiency and yield were significantly reduced due to disconnection and short circuit.
[0007]
Therefore, it is strongly required to adopt the star connection method that can obtain the same characteristics as the delta connection method, and that can be used for wire breakage and short-circuiting, which is a problem with ultra-thin wires, and thickening the coil, which is advantageous for power saving. . That is, by increasing the coil wire diameter, the above problems in the winding process can be solved, and the resistance value R can be increased and the current consumption I can be reduced.
[0008]
However, if the star connection method is adopted for a small coreless motor, work efficiency is increased because the coil terminals must be rolled up in the air and combined into a single wire and connected to the commutator terminal. There was a problem that productivity was not improved and yield was hindered.
[0009]
The present invention has been made in view of the above, and is a small coreless motor that can be easily wired at a midpoint without performing aerial wiring even in a difficult star connection (Y connection) system. An object of the present invention is to significantly improve the working efficiency by adopting the rotor portion connection structure.
[0010]
[Means for Solving the Problems]
In order to achieve the above object, in the small coreless motor according to claim 1, in the small coreless motor using a winding coil by star connection , the end of the cup-type rotor portion of the motor on the commutator side In addition, a conductive midpoint ring is provided that is electrically separated from the commutator terminal and connects each coil terminal of the winding coil tap wire serving as a midpoint portion of the star connection.
[0011]
According to this invention, the conductive mid-point ring is disposed on the rotor side surface, for example, a part of the disk-shaped support (coil holder) at the end of the cylindrical winding coil, and the star connection midpoint (common part) and By connecting the coil terminals together to the conductive middle point ring portion, the aerial wiring process, which has been a troublesome work process in the past, is unnecessary, and the coil terminal process can be facilitated and further automated.
[0012]
Further, in this small coreless motor, the conductive midpoint ring has a substantially ring shape in a thin plate, and a partial connection space serving as a land portion such as soldering is provided in an arrangement that matches each coil terminal. It is what has been. In addition to the thin ring shape, the shape may be a through-hole wiring board or the like in which conductive portions are connected in a circle.
[0013]
Further , according to the present invention, for example, the three corresponding ring-shaped portions are provided so as to substantially match the three coil terminals protruding in the inner diameter direction at an equal distribution interval of approximately 120 degrees in the star connection, and By securing a sufficient space for connecting coil terminals, it is possible to facilitate or mechanically automate the work of electrical connection such as rotational alignment and soldering or spot welding. It becomes.
[0014]
Moreover, in the small coreless motor according to claim 2 , the conductive midpoint ring is made of a material having excellent conductivity such as phosphor bronze having a small electrical resistance, or a conductive plated plate. .
[0015]
According to the present invention, in claim 1 , the ring material itself can be obtained by simple processing and the shape is simple by producing the conductive midpoint ring by phosphor bronze or a conductive plating plate having a low electrical resistance. This makes it possible to quickly respond to shape changes.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a preferred embodiment of a small coreless motor according to the present invention will be described in detail with reference to FIGS. In addition, although this invention was shown as this embodiment, this invention is not limited to this, The same thing is included from a shape and a structural viewpoint.
[0017]
Here, for example, a small coreless motor used as a vibration motor for driving a vibrator when setting the manner mode of a mobile phone will be described.
[0018]
1 and 2 are explanatory diagrams 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 portion viewed from one axial end side, and FIG. 2 is an external view of the rotor portion viewed from the axial side surface direction. FIG. 3 is an explanatory diagram showing a rotor side sectional configuration of the coreless motor according to the embodiment of the present invention shown in FIG.
[0019]
The winding coil of this small coreless motor has a structure using a star connection (Y connection) system, and a center point (common part) of the star connection (Y connection) inside the motor is provided at one end of the rotor. Each connection is processed.
[0020]
In each figure, reference numeral 10 is a commutator of a contact sliding part, reference numeral 10a is a commutator terminal of a connection part, reference numeral 11 is a midpoint ring which is a characteristic part of the present invention having a shape and function as described later, Reference numeral 11a is a mid-point ring connection portion provided in the mid-point ring 11, reference numeral 12 is a hollow cylindrical winding coil held by the holder 15, reference numeral 12a is a coil terminal for the middle point of the cylindrical winding coil 12, reference numeral Reference numeral 12b denotes a coil terminal for a commutator 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 integrated with a holder 15 that insulates each commutator 10.
[0021]
As shown in the figure, the midpoint ring 11 has a thin ring shape, and has three connection portions (with a 120 degree interval in shape) so that the midpoint (common portion) is connected to the coil terminal. Arrangement) swells (wiring space) in the inner region. In addition, the midpoint ring 11 has low electrical resistance. For example, a conductive thin plate material such as a copper plate or phosphor bronze plate is formed as a current-carrying part by press punching, etc., and solder plating or gold plating is applied to these materials as necessary. Processing should be done.
[0022]
Next, a 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 arranged 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 coincides with the midpoint coil terminal 12a. Fix it in place.
[0023]
Thereafter, the midpoint ring connection portion 11a of the midpoint ring 11 and the midpoint coil terminal 12a are connected by soldering or spot welding, and the commutator terminal 10a and the commutator coil terminal 12b are also similarly connected by soldering. The rotor part star connection as shown in FIG.
[0024]
Therefore, as described above, the midpoint (common) portion of the star connection is connected in the shape arrangement of the midpoint ring 11, so that the midpoint portions are gathered and connected in the air (space portion). This eliminates the need for such troublesome work and eliminates the need for a space for aerial wiring. In particular, the wiring structure by the midpoint ring 11 becomes more effective in assembly as the motor becomes smaller and smaller in diameter. That is, when adopting the star connection, the connection process of the coil terminal is easy and the aerial wiring is unnecessary, so that the production efficiency is improved.
[0025]
In addition, since this star connection can use a thick wire type coil wire compared to the conventional one, it is possible to reduce the occurrence of troubles such as disconnection and short in wiring work, and to increase the electrical resistance, Current consumption is reduced. Therefore, it can be mounted on a small information device or the like that is strongly required to be small and power-saving such as a mobile phone. Furthermore, this star connection enables, for example, 3v circuit design corresponding to the voltage specification of the secondary battery of the mobile phone.
[0026]
In this embodiment, the rotor portion of a small vibration coreless motor used for a mobile phone or the like has been described as an example, but in addition to this, for example, an ultra-small coreless motor used for a small medical device or the like. Application is possible, but is not limited to this.
[0027]
【Effect of the invention】
As described above, according to the small coreless motor according to the present invention (Claim 1), the conductive midpoint ring for connection to each coil terminal is disposed on the side surface of the rotor, By connecting each coil terminal that is the midpoint (common part) of the star connection, the aerial wiring process of the midpoint part, which was a troublesome connection process in the past, is unnecessary, and the coil terminal process can be easily performed during assembly. As a result, the time required for terminal processing is shortened, and as a result, production efficiency and yield can be improved.
[0028]
Also, alignment and soldering are ensured by securing space for connecting the coil terminals at three locations on the inner diameter side of the ring so as to match the three coil terminals provided at intervals of approximately 120 degrees in the star connection. Since electrical connection work such as attachment or spot welding can be performed easily and reliably, the workability of the entire coil terminal process is improved as well as the connection of the midpoint portion.
[0029]
Further, according to the small coreless motor according to the present invention (Claim 2 ), the conductive midpoint ring according to Claim 1 can be produced by punching copper or phosphor bronze having a small electrical resistance. Since it is a very simple process and can be obtained on a mass production basis as a low-cost part, it is not expensive and can be used for mass production. Furthermore, since the shape is simple, the design can be changed quickly even if the shape / material changes.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram showing a configuration of a connection portion of a cup-type rotor in a small coreless motor according to an embodiment of the present invention.
FIG. 2 is a diagram showing a side external configuration of a small coreless motor according to an embodiment of the present invention.
FIG. 3 is a diagram showing an internal configuration of a side cross section of a small coreless motor according to an embodiment of the present invention.
FIG. 4 is an explanatory diagram showing a configuration of coil wiring according to the embodiment of the present invention.
FIG. 5 is an explanatory diagram showing a configuration of a connection portion of a cup-type rotor of a small coreless motor in a conventional structure.
FIG. 6 is an explanatory view showing a side external appearance configuration of a cup-type rotor of a small coreless motor in a conventional structure.
FIG. 7 is a side sectional view for explaining the inside of a conventional small cylindrical coreless vibration motor.
[Explanation of symbols]
10 Commutator
10a Commutator terminal
11 Midpoint ring
11a Middle point ring connection
12 winding coil
12a Coil terminal for midpoint
12b Coil end for commutator
13 Shaft
14 Insulated cylinder
15 Holder
21 Vibration coreless motor
22 Eccentric weight
23 Housing
24 Magnet
25 Bearing
26 End cap
27 Brush

Claims (4)

In a small coreless motor using a winding coil with star connection,
Conductor for connecting each coil terminal of the winding coil tap wire, which is disposed at the commutator side end of the cup-type rotor portion of the motor and is electrically separated from the commutator terminal and becomes the midpoint of the star connection. A conductive midpoint ring, and the conductive midpoint ring has a shape of a thin plate ring, and a connection space is provided in an inner region of the thin plate ring at a position matching the coil ends. Small coreless motor characterized by 2. The small coreless motor according to claim 1 , wherein the conductive mid-point ring is made of phosphor bronze or a conductive plated plate having a small electric resistance. 3. The small coreless motor according to claim 1, wherein the drive voltage of the motor is set to a voltage specification that is double the normal voltage by installing the conductive midpoint ring. Mobile telephone terminal apparatus and communication apparatus using a small coreless motor as claimed in any one of claims 1-3.

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