JPH11332198A - Armature of dc motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the end process of winding by introducing a structure in which a terminal of noise preventing circuit is connected with a plurality of winding start portions of a winding, while a terminal of short circuit is connected with a plurality of winding end portions of a winding. SOLUTION: This armature 1 is provided with a connecting plate 8 for similarly coupling the end portion 132 of winding and start portion 131 of winding. A short circuit of connecting plate 8 is provided with a tonque piece type terminal 811 and so on to independently connect one by one the three winding end portions 132, while a noise suppressing circuit is also provided the tonque portion terminal 821 and so on. The winding end portion 132 is connected to a terminal 811 of the short circuit, while the extending line 133 of winding start portion 131 is connected to the terminal 821 of the noise preventing circuit. Thereby, since the winding end portion can be processed individual one by one, it is no longer required to tentatively fix the winding end portion using a jig. Accordingly, the winding end portion process capability can be improved, and working time of winding process can be reduced substantially.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an armature of a DC motor, and more particularly to an armature of a small DC motor having improved assemblability.

[0002]

2. Description of the Related Art In recent years, small DC motors (hereinafter simply referred to as motors) have attracted attention for various uses. For example,
An eccentric weight is fixed to the drive end of the armature shaft,
BACKGROUND ART A cylindrical vibration motor used for a mobile phone or a pager, a floppy disk drive motor for driving a floppy disk of a mobile computer, and the like are known.

[0003] By the way, the winding of the armature used in such a motor generally adopts a star connection, the starting end of the winding is connected to a commutator, and the winding end which is a neutral point is collectively called a so-called "3". They are bundled and pushed between the windings to be fixed.

[0004]

However, in the above-mentioned conventional armature, the three wires at the end of the winding temporarily fixed to the jig at the time of winding are once removed, and then the two wires are collectively twisted and soldered. It was difficult to automate by machine because it was pushed between two windings, and had to rely on manual work,
There was a problem that it took time to perform the connection work.

[0005] Further, since the three-bundled terminals are pushed between the windings, the windings may be damaged, causing a short circuit or protruding outside the armature core and interfering with the magnet, making it impossible to rotate. And other problems such as becoming discomfort. As a means for preventing a short circuit, a method of insulating the three-bundled portion with an insulating tube or the like has been proposed. However, the number of components is increased, and an extra work time is required.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned disadvantages, and to improve the armature component configuration to improve the terminal processing of a winding.

[0007]

Therefore, in the armature of a DC motor according to the present invention, an armature core is fixed to an armature shaft, and a plurality of windings are wound around the armature core. A commutator is fixed to the armature shaft, and the commutator includes a plurality of commutator pieces that maintain a predetermined mechanical and electrical positional relationship with the winding, and a terminal portion of the plurality of commutator pieces. A plurality of winding start ends of the windings are extended and connected, while a connection plate is fixed on the side of the armature shaft opposite to the commutator with respect to the windings, and the connection plate is short-circuited. A circuit and a noise prevention circuit, wherein a plurality of winding ends of the winding are connected to terminal portions of the noise prevention circuit, and a plurality of winding ends of the winding are connected to terminal portions of the shortening circuit, respectively. It is characterized by being.

In the armature of a DC motor according to the present invention, an armature core is fixed to an armature shaft, a plurality of windings are wound around the armature core, and a rectifier is wound around the armature shaft. The commutator includes a plurality of commutator segments that maintain a predetermined mechanical and electrical positional relationship with the winding, and a plurality of commutator segments are provided at terminal portions of the plurality of commutator segments. While a winding terminal of the armature shaft is connected, a connection plate is fixed on the side of the armature shaft opposite to the commutator, the connection plate including a short circuit and a noise prevention circuit, A plurality of winding ends of the winding are connected to a terminal portion of the shortening circuit, and a plurality of winding ends of the winding are extended and connected to the terminal portion of the noise prevention circuit. I do.

One of the features of the present invention is that the connection plate is fixed to the armature shaft, and the ends of the windings are individually connected to the terminal portions of the connection plate one by one. This allows
Temporary fixing of the winding end is not required, and the winding process can be performed by a machine. In addition, since the winding terminal is not strongly pressed against the winding, there is no need to perform insulation treatment.

Another feature of the present invention resides in that the noise prevention circuit is rationally configured on the connection plate. As a result, an inexpensive and high-performance motor can be provided.

Although the connection plate may be in any form, it is provided with a tongue-shaped terminal portion, and the terminal portion has a winding start end or a winding end,
That is, when the winding terminals are connected, it is not necessary to temporarily fix the winding terminals using a jig. That is, it is preferable that the connecting plate has a form having a plurality of tongue-shaped terminal portions, and a terminal corresponding to the winding wire is connected to each terminal portion.

The connection plate is fixed coaxially with the armature shaft opposite to the commutator by means such as press fitting. Jigs and tools used to temporarily fix the winding end, which was conventionally used, by fixing the winding start end to the terminal of the connection plate and terminating the end to the terminal of the commutator piece. Becomes unnecessary.

The connection plate is preferably formed of a printed circuit board. In addition to the shortening circuit corresponding to the three bundle connection, a noise prevention circuit is provided by fixing a capacitor chip for preventing noise caused by a commutator spark. Can be configured. If a terminal portion is provided corresponding to the short circuit and the noise prevention circuit, a winding terminal or an extension of the terminal can be connected, and a temporary fixing jig is not required.

Further, in the case of a vibration motor, an eccentric weight is provided on the armature shaft. If the eccentric weight is provided with a concave portion and a capacitor chip is accommodated in the concave portion, the axial dimension of the motor can be reduced. The motor can be configured to have substantially the same size as a motor having no noise prevention circuit.

[0015]

According to the present invention, according to the present invention, a connecting plate having a plurality of terminals is provided on the armature shaft on the opposite side of the commutator on the same side as the commutator. Since the terminals are connected to the terminals, the winding terminals can be individually processed one by one, and it is not necessary to temporarily fix the winding terminals using a jig as in the conventional case, and the winding terminals are not required. The processing can be automated, and the working time of the winding process can be significantly reduced.

Further, since the winding ends are not strongly pressed between the windings as in the prior art, the windings may be damaged,
There is no need to protrude outside the armature core and interfere with the magnet to prevent rotation, and it is not necessary to perform insulation treatment with an insulating tube or the like.

Conventionally, it has been difficult for such a small motor to incorporate a noise prevention circuit including a capacitor, and no noise prevention measures have been taken. Therefore, when it is desired to use a motor with low noise, it is necessary to rely on an expensive coreless structure having a small armature inductance. According to the present invention, since the noise prevention circuit is formed on the connection plate, a motor having a noise prevention function can be supplied at low cost.

In the case where the present invention is applied to a vibration motor, the axial dimension can be reduced by storing the chip in a recess provided in the eccentric weight.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to specific examples shown in the drawings. 1 and 3 are views showing a preferred embodiment of the armature according to the present invention, FIG. 2 is a view showing a connection plate in the above embodiment, and FIG. 4 is a connection diagram for explaining connection of windings in the above embodiment. FIG. 5 is a diagram showing a structural example of a vibration motor using a conventional armature, FIG. 6 is a diagram showing a structural example of a conventional armature, and FIG. 7 is a diagram illustrating connection of windings in the armature of FIG. FIG.

First, the structure of this type of motor will be described to facilitate understanding of the present invention. 5, 1 is an armature, 11 is an armature shaft, 2 is a cylindrical housing containing the armature 1, 3 is a magnet fixed in the housing 2, 4 is a brush holder for holding brushes 41 and 42, 5
1, 52 are bearings for rotatably supporting the armature shaft 11, and 7 is a commutator.

In FIG. 6 showing the armature 1, 11
Is an armature shaft, 12 is an armature core fixed to the armature shaft 11, 13 is a winding wound around the armature core 12, 131 is a starting end of the winding 13, 132 is an end of the winding 13, 7 Is a commutator fixed to the armature shaft 11, 71
Is a plurality of commutator pieces of the commutator 7, 72 is an insulator for insulating the commutator 7 from the armature shaft 11, and 73 is a commutator piece 71.
Terminal section.

As shown in FIGS. 6B and 6C, the commutator 7 has three commutator pieces 71.
Are arranged at equal intervals in the circumferential direction with an insulator 72 interposed therebetween, and winding start ends 131 are independently connected to terminal portions 73 of each commutator piece 71. On the other hand, three ends 132 of the windings 13 are bound together by a method such as torsion, and are appropriately soldered and pressed between the windings 13 to be fixed.

FIG. 7 shows an example of connection between the winding 13, the winding start 131, the winding end 132 and the terminal 73 of the commutator piece 71.

In the winding operation, the winding start end 131 is stopped around the terminal portion 73 of the commutator piece 71 by means such as winding.
The conductor 13 is formed by winding the conductor around the armature core 12 a predetermined number of times, and the winding end 132 is temporarily fixed to a winding jig (not shown). When the winding operation is completed by repeating this three times, the temporarily terminated winding end 132 is once removed from the jig, and three bundles are connected again to complete the armature.

However, in the winding procedure described above, the winding end 1
Since a winding jig for temporarily fixing 32 is required, and it takes time to manually connect three bundles again after the completion of the winding work,
Poor work efficiency. In addition, the three-bundled connection part is the armature core 12
If it protrudes from the outer peripheral surface, it interferes with the magnet 3 and cannot rotate.

FIGS. 1 to 3 each solve the above-mentioned disadvantage, and are provided with a connecting plate 8 for connecting the winding end 132 in the same manner as the winding start 131. As shown in FIGS. 2A and 2B, the connection plate 8 includes a short circuit 81 and a noise prevention circuit 82, and three short winding ends 132 are independently connected to the short circuit 81 one by one. Are provided so that the tongue-shaped terminals 811... Are provided, and the noise prevention circuit 82 is also provided with tongue-shaped terminals 821. As a result, the winding end 132 is connected to the terminal 811 of the short circuit 81.
The extension line 133 of the winding start end 131 can be connected to the terminal 821 of the noise prevention circuit 82. This allows any of the winding terminals 131, 1
32 does not need to be temporarily fixed to the winding jig, so that the connection of the armature winding 13 is completed simultaneously with the completion of the winding work.
It is no longer necessary to perform manual connection processing again.

In the examples shown in FIGS. 1 to 3, the tongue-shaped terminal portions 811 and 821 have a simple shape.
A shape suitable for the winding, such as providing a hook or a notch, may be adopted as appropriate.

Hereinafter, the embodiment will be described in detail, but the description will proceed with the winding start end 131 and the winding end 132 of the winding 13 as the start end and the end in the winding operation, respectively.

FIG. 1 shows a first embodiment. In the figure, a connecting plate 8 is connected to an armature shaft 11 on the side opposite to the commutator 7.
It is fixed to. The connection plate 8 is formed of a printed board, and includes a short circuit 81 and a noise prevention circuit 82 as shown in FIG. 2, and a terminal 811 of the short circuit 81 and a terminal 821 of the noise prevention circuit 82. I have.

The short circuit 81 includes a donut-shaped conductor pattern 812 concentric with the armature shaft 11 and the conductor pattern 81.
2 to three radial conductor patterns 813 from the terminal portion 811 of the short circuit 81. The noise prevention circuit 82 includes three arc-shaped conductor patterns 822, three radial conductor patterns 823 extending from the conductor pattern 822 to the terminal portion 821 of the noise prevention circuit 82, and the capacitor 9. A land 824 is provided outside the donut-shaped conductor pattern 811 and in the middle between the radial conductor patterns 813 and 813, and connected to and fixed to the capacitor 9 at both ends. As shown in FIG. 2A, the capacitor 9 straddles the radial conductor pattern 813 and is adjacent to the radial conductor pattern 813.
The two arc-shaped conductor patterns 822, 822 are fixed to the land 824 by means such as soldering so as to be connected to each other. The conductor patterns 812 and 813 form a short circuit. The winding end 132 is similarly connected to the connection plate terminal 81.

Although the conductor patterns 812 and 822 of the short circuit 81 and the noise prevention circuit 82 are shown in the form of a donut or an arc, the present invention is not limited to this. Any shape that suits your needs is acceptable.

FIG. 4 shows the connection of the winding according to the present invention. FIG. 4A shows a general expression method, and FIG. 4B shows a state close to the actual state. .

The connection according to the present invention is performed as follows.
That is, the winding start end 131 is connected to the noise prevention circuit 8 of the connection plate 8.
2, is fixed by a method such as winding as shown by reference numeral A, and an extension 133 of the winding start end 131 is pulled to the terminal portion 73 of the commutator piece 71, and the reference And fixed by a method such as winding. Next, the armature winding 13 is wound a predetermined number of times, and when the winding is completed, the winding end 132 is wound around the terminal portion 811 provided in the short circuit 81 as indicated by the symbol A ". And so on.

As is apparent from the above description, the winding operation according to the present invention is performed by using the winding start end 13 for one winding 13.
1. Extension line 13 as a connection line to noise prevention circuit 82
3, the winding 13, and the winding end 132 are processed by one wire, and there is no need to use a tool.

This operation is repeated three times to complete the winding process, and at the same time, the connection is automatically completed, and can be sent to the next process such as soldering in the same state.

In the above description, the winding starting end 131 is connected to the connecting plate 8.
Has been described, the work is started by winding around the terminal portion 812 of the noise prevention circuit 82 provided in the first embodiment.
May be wound around the terminal portion 811 of the shortening circuit 81. In this case, the winding 13 is then wound, the winding end 132 is connected to the terminal portion 73 of the commutator piece 71, and the extension 813 provided toward the winding end 132 is provided on the connection plate 8 to prevent noise. The same connection form can be obtained by pulling and connecting to the terminal portion 821 of the circuit 82. Either method can be selected as appropriate according to the design or the convenience of the machine.

FIG. 3 shows an embodiment applied to a vibration motor. In the figure, reference numeral 10 denotes an eccentric weight. The eccentric weight 10 has a concave portion 101 so that the insulating plate 8 to which the capacitor 9 is fixed can be stored.

The vibration force caused by the eccentric weight 10 is
As is well known, the inertia is larger at a portion closer to the outer periphery and smaller at a portion closer to the axis. Therefore, the recess 1 is located near the armature shaft 11.
By providing 01, the reduction of the inertia which affects the vibration force becomes small, and a great effect that the axial dimension of the armature 1 can be reduced can be obtained.

[Brief description of the drawings]

FIG. 1 is a diagram showing an overall configuration (a), a front configuration (b), and a rear configuration (c) in a preferred embodiment of an armature of a DC motor according to the present invention.

FIG. 2 is a diagram showing a front (a) of an example of a connection plate in the armature and a front (b) of the armature with a capacitor removed.

FIG. 3 is a view showing another embodiment of the armature of the DC motor.

FIG. 4 is an equivalent circuit diagram of connection of windings in the embodiment.
FIG. 3A is a diagram showing a specific connection (b).

FIG. 5 is a sectional view showing an example of a conventional DC motor.

FIG. 6 is a diagram showing an entire configuration (a), a front configuration (b), and a rear configuration (c) of an example of a conventional DC motor armature.

FIG. 7 is a diagram showing connection of windings in a conventional DC motor.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Armature 13 Winding 131 Winding start end 132 Winding end 133 Extension line 7 Commutator 71 Commutator piece 72 Insulator 73 Commutator terminal part 74 Positioning concave part 8 Connection board 81 Short circuit 811 Short circuit terminal 812 Donut shape Conductor pattern 813 Radial conductor pattern 82 Noise prevention circuit 821 Terminal part of noise prevention circuit 822 Arc-shaped conductor pattern 823 Radial conductor pattern 824 Land 9 Capacitor 10 Eccentric weight 101 Eccentric weight recess

Claims (5)

[Claims] An armature core is fixed to an armature shaft, a plurality of windings are wound around the armature core, a commutator is fixed to the armature shaft, and the commutator is fixed to the winding. A plurality of commutator segments that maintain a predetermined mechanical and electrical positional relationship with the wire; a plurality of winding start ends of the windings are extended and connected to terminal portions of the plurality of commutator segments; On the other hand, a connection plate is fixed to the armature shaft on the side opposite to the commutator with respect to the winding, and the connection plate includes a short-circuit circuit and a noise prevention circuit. An armature for a DC motor, wherein a plurality of winding ends of the winding are connected to terminal portions of the shortening circuit, respectively, and a plurality of winding ends of the winding are connected. 2. An armature core is fixed to the armature shaft, a plurality of windings are wound around the armature core, a commutator is fixed to the armature shaft, and the commutator is fixed to the winding. A plurality of commutator segments that maintain a predetermined mechanical and electrical positional relationship with the wire, and a plurality of terminal ends of the windings are connected to terminal portions of the plurality of commutator segments; A connection plate is fixed to the armature shaft on a side opposite to the commutator with respect to the commutator. The connection plate includes a short circuit and a noise prevention circuit. An armature for a DC motor, wherein a plurality of winding ends are connected, and a plurality of winding ends are extended and connected to a terminal portion of the noise prevention circuit. 3. The connecting plate is a printed circuit board, wherein the plurality of terminal portions have a tongue-like shape, and the shortening circuit is formed by a conductor pattern concentric with the armature shaft and a doughnut-shaped conductor pattern. 3 to the terminal
Three arc-shaped conductor patterns, each of which is provided outside the donut-shaped conductor pattern and in the middle of each of the adjacent radial conductor patterns of the short-circuit circuit. 3. The direct current according to claim 1, comprising a radial pattern extending from the arc-shaped conductor pattern to its terminal portion, and a capacitor that is surface-mounted so as to cross over the radial pattern and connect the adjacent arc-shaped conductor patterns to each other. Armature of electric motor. 4. An armature used for a cylindrical vibration motor, wherein an eccentric weight is fixed to the armature shaft,
The armature of a DC motor according to any one of claims 1 to 3, wherein the eccentric weight is configured to generate a vibration force. 5. The armature of a DC motor according to claim 4, wherein said eccentric weight has a recess for accommodating said connection plate.