JP3595023B2 - Multi-pole motor - Google Patents

Description

[0001]
[Industrial applications]
The present invention relates to a multi-pole motor, and more particularly to a multi-pole motor that can be selectively changed to, for example, a one-speed motor or a two-speed motor.
[0002]
[Prior art]
Conventionally, when the setting is selectively changed to a one-speed motor or a two-speed motor using, for example, a four-pole motor, the end bracket 21 is viewed from the inside of the motor as shown in FIGS. 4 (a) and 4 (b). As shown in the figure, the lead wires 22 extending from the four brushes 3 to 6 via the pigtails 3a, 4a, 5a and 6a are reconnected, and in the case of a one-speed motor, the two-speed motor is started from one place. In the case of (1), it was taken out from two places through rubber grommets 23 and 24 to the outside.
[0003]
[Problems to be solved by the invention]
In this case, as shown in the drawing, in order to utilize the connection of the one-speed type motor, the lead wires 22 having different polarities are received by one grommet in the case of the two-speed type motor. Therefore, for example, when the motor is heated and the rubber grommets 23 and 24 are carbonized, a short circuit between the lead wires 22 may occur. Further, since the lead wires 22 are reconnected between the one-speed type motor and the two-speed type motor as described above, it is necessary to change the parts accordingly, and the number of parts to be managed and the number of work steps tend to increase. there were.
[0004]
SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and its main purpose is to prevent a short circuit even when the motor is heated and to select a 1-speed motor or a 2-speed motor, for example. It is an object of the present invention to provide a multi-pole motor which can reduce the number of parts managed by the multi-pole motor which can be changed in a simple manner and which can easily change the electrical connection from the outside to the brush inside the motor.
[0005]
[Means for Solving the Problems]
According to the object the present invention described above, with each plurality of brushes forming the positive electrode and the negative electrode, said electrically connected to the brushes, and a plurality of terminals for connecting them to external power supply line, said brush and A brush holder stay provided with the terminal , wherein the plurality of terminals and a pair of the same poles are connected to each other via a conductor piece that can be separated by a contact / separation jig , and A pair of same-polarity terminals are arranged closer to each other than between different-polarity terminals, and the brush holder stay is provided with a hole for connecting the pair of same-polarity terminals and the external power supply line, and This is achieved by providing a multipolar motor, wherein the hole is provided at the position of the conductor piece .
[0006]
[Action]
In this case, for example, when a four-pole motor is used as a one-speed motor, the conductor between the terminals is not separated, and an external power supply line may be connected to any of the terminals. Further, for example, when used as a two-speed motor, the conductor between the terminals may be cut off, and an external power supply line corresponding to each terminal may be connected. Similarly, when using as a three-speed, four-speed motor, or the like having more poles, the conductor between the terminals may be selectively separated and an external power supply line corresponding to each terminal may be connected. In addition, by arranging only terminals of the same polarity close to each other, these conductors can be received by one grommet. In this case, for example, even if the grommet deteriorates or breaks and the conductive wire and the internal wire come into contact with each other, they have the same polarity, and thus only affect the speed control, and the motor does not stop.
[0007]
【Example】
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.
[0008]
FIG. 1 is a view of an end bracket 1 viewed from the inside of a four-pole motor to which the present invention is applied. The end bracket 1 holds two sets of four brushes 3 to 6 with a central commutator 2 interposed therebetween, via a brush holder stay 7 and a brush holder 8. The brush holder stay 7 is insert-molded with a brush holder 8 and conductive plates 3b, 4b, 5b and 6b to be described later. As shown in FIG. 2, each of the brushes 3 to 6 is urged toward the commutator 2 by a torsion coil spring 7 c supported by a support 7 b erected on a brush holder stay 7. The brushes 3 to 6 are connected to an external power supply line so that the brushes facing each other (positive electrode: brush 3 and brush 5, negative electrode: brush 4 and brush 6) have the same polarity. The brushes 3 to 6 are connected to terminals 9 to 12 via pigtails 3a, 4a, 5a and 6a and conductive plates 3b, 4b, 5b and 6b as internal lead wires.
[0009]
The positive terminals 9 and 11 are arranged close to each other at the bottom of the figure, and the negative terminals 10 and 12 are arranged close to each other at the top of the figure. The external power supply lines 17 and 18 extending from the terminals 9 and 11 to the outside are held by the rubber grommet 13, and the external power supply lines 19 and 20 extending from the terminals 10 and 12 to the outside are held by the rubber grommet 14. Here, the brush holder stay 7 is provided with a hole 7a for inserting and holding the rubber grommets 13 and 14, and the hole 7a is also used for separating the conductor pieces 15 and 16 described later. .
[0010]
As shown in FIGS. 3 (a) and 3 (c), the terminal 9 and the terminal 11 which are arranged close to each other are made of a conductor 5b which is formed integrally with the conductor 3b and which can be easily separated. Are electrically connected by welding. Similarly, the terminals 10 and 12 arranged close to each other are electrically connected by welding a conductor piece 16 formed integrally with the conductor 6b and easily separable to the conductor 4b. Therefore, when the four-pole motor is used as a one-speed motor, the conductor pieces 15 and 16 between the terminals are not separated, and an external power supply line may be connected to one of the terminals. When used as a two-speed motor, the conductor pieces 15 and 16 between the terminals are separated using a separation jig using the holes 7a of the brush holder stay 7 (FIGS. 3B and 3D). Then, external power supply lines corresponding to the respective terminals may be connected. 3 (a) to 3 (d) are enlarged views of a connection portion between the terminal 9 and the terminal 11, and a connection portion between the terminal 10 and the terminal 12 has a similar structure. It is not shown in the figure.
[0011]
In this embodiment, the conductor piece is formed integrally with one conductor, and is welded and connected to the other conductor.However, the present invention is not limited to this. May be welded in a bridge shape. Also, the same polarity external power supply line is received by the same rubber grommet, but the same polarity terminal inside the motor is directly received by the rubber grommet, and the power supply line is connected to each terminal inside the grommet or outside the motor. It is good.
[0012]
【The invention's effect】
As is clear from the above description, according to the multipolar motor of the present invention, the terminals of the same polarity are arranged close to each other, and the terminals of the different polarity are arranged so as to be separated from each other. By connecting to each other with selectively separable conductors, even when the motor is heated, a short circuit does not stop the motor, thereby improving the reliability of the motor. When a four-pole motor is used as a one-speed motor, for example, the conductor between the terminals is not separated, and an external power supply line may be connected to one of the terminals. Further, for example, when used as a two-speed motor, the conductor between the terminals may be cut off, and an external power supply line corresponding to each terminal may be connected. Similarly, when using as a three-speed, four-speed motor, or the like having more poles, the conductor between the terminals may be selectively separated and an external power supply line corresponding to each terminal may be connected. Therefore, in any case of setting, components can be shared, the number of component management points can be reduced, and the work of changing the electrical connection is facilitated. In addition, by arranging only terminals of the same polarity close to each other, these conductors can be received by one grommet.
[Brief description of the drawings]
FIG. 1 is a view of an end bracket viewed from the inside of a four-pole motor to which the present invention is applied.
FIG. 2 is a view taken along line II-II in FIG.
FIGS. 3 (a) and (b) are enlarged views of FIG. 1 showing an operation procedure of the present invention, and FIGS. 3 (c) and (d) are side views of (a) and (b).
FIGS. 4A and 4B are views of an end bracket viewed from the inside of a conventional four-pole motor.
[Explanation of symbols]
Reference Signs List 1 end bracket 2 commutator 3-6 brush 3a, 4a, 5a, 6a pigtail 3b, 4b, 5b, 6b conductive plate 7 brush holder stay 8 brush holder 9, 11 positive terminal 10, 12 negative terminal 13, 14 rubber grommet 15, 16 Conductor pieces 17 to 20 External power supply line 21 End bracket 22 Lead wire 23, 24 Rubber grommet

Claims (2)

A plurality of brushes each forming a positive electrode and a negative electrode,
A plurality of terminals electrically connected to each of the brushes, and for connecting these to an external power supply line, and a brush holder stay provided with the brush and the terminal ,
The plurality of terminals and a pair of terminals having the same polarity are connected to each other via a conductor piece that can be separated by a contact / separation jig ,
The pair of same-polarity terminals are arranged closer to each other than between terminals of different polarities,
The brush holder stay is provided with a hole for connecting the pair of same-polarity terminals and the external power supply line, and the hole is provided at a position of the conductor piece . The brushes of the same polarity are provided at positions facing each other with the commutator of the motor rotor interposed therebetween,
The multi-pole motor according to claim 1, wherein the conductors having the same polarity are received in the same grommet.

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