Electrical generator or motor structure – Dynamoelectric – Rotary
Reexamination Certificate
2002-11-04
2004-12-28
Tamai, Karl (Department: 2834)
Electrical generator or motor structure
Dynamoelectric
Rotary
C310S242000, C310S071000, C310S244000, C310S245000, C310S246000
Reexamination Certificate
active
06836050
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a motor with brush, more particularly to terminal structures for connecting brushes of the motor to an external circuit.
2. Description of Related Art
A typical motor with brush includes a stator, a rotor having a rotary shaft and a brush section that is in sliding contact with a commutator that is retained at the rotary shaft of the rotor. Driving coils of the motor are energized through the brush section and the commutator. As a result, energization on the driving coils is switched according to rotational positions of the rotor, such that electromagnetic attraction and repelling forces between the rotor and the stator are continuously generated in one direction to continuously rotate the rotor. The brush is retained on the side of the stator in a manner to have a predetermined relative positional relation with the commutator, and is equipped with a terminal that allows the brush to be connected to an external connection member for supplying an external electrical power to the motor. The brush section that includes the terminal may have a variety of designs.
A conventional structure of a brush section of a motor with brush is shown in FIGS.
9
(
a
) and
9
(
b
). In FIG.
9
(
a
), a terminal for a brush (hereafter referred to as a “brush terminal”)
11
is bonded to a brush section
19
in a unitary fashion. The brush terminal
11
include a leg section
13
and bendable claw sections
18
on both sides of a base section of the leg section
13
. The brush terminal
11
has a base section with retainer claw sections
16
, which is press fitted in an insertion aperture of an insulation resin holder
20
such that the retainer claw sections cut into wall surfaces of the insertion aperture of the holder
20
. Then, as shown in FIG.
9
(
b
), the claw sections
18
are bent such that the holder
20
is held between the claw sections
18
and a stepped section
12
of the brush terminal
11
, to thereby position and fix the brush terminal
11
to the brush section
19
.
Another conventional structure of a brush section of a motor with brush is shown in FIGS.
10
(
a
)-
10
(
d
). In FIG.
10
(
a
), a brush terminal
22
is bonded to a brush section
21
in a unitary fashion. The brush terminal
22
includes a first power supply terminal section
23
that extends from the brush section
21
and a second power supply terminal section
24
. The brush terminal
22
is affixed to an insulation member such as a resin holder in a manner that the first power supply terminal section
23
and the second power supply terminal section
24
protrude externally from a motor case
25
, as shown in FIG.
10
(
b
).
In an example shown in FIG.
10
(
b
), the motor is mounted on a substrate
26
, and the second power supply terminal section
24
is fitted in a hole provided in the substrate
26
and soldered to a circuit pattern on the substrate
26
. In this example, since the first power supply terminal section
23
is not required, the first power supply terminal section
23
can be removed, as shown in FIG.
10
(
c
).
An example shown in FIG.
10
(
d
) uses the first power supply terminal section
23
. In this example, an outer circumference of the motor together with the first power supply terminal section
23
is fitted in a hole formed in the substrate
26
, and the first power supply terminal section
23
is soldered to a circuit pattern on the substrate
26
. In this case, the second power supply terminal section
24
is removed.
A lead wire for power supply is soldered to the brush terminal, or the brush terminal is soldered to a circuit pattern on the substrate. At the time of the soldering work, the resin holder may melt and deform, such that the position of the brush may be changed. If the position of the brush is changed, the timing to switch power to the driving coils may be deviated, which causes a fatal defect for the motor with brush. In view of this problem, the claw sections of the brush are bent to hold the resin holder by the claw sections and the stopped section of the brush terminal as indicated in FIG.
9
. However, the structure shown in
FIG. 9
as described above is not perfect as a countermeasure against the heat problem at the time of soldering work, and the shape of the terminal become complicated.
Also, in any of the conventional terminal structures described above, the disposed position of the brush determines the position of the terminal. If the locations of the brushes in a pair are separated from each other, the locations of the terminals in a pair are separated from each other accordingly. For example, in the case of a motor having four poles of magnets and six poles of cores, brushes in pairs are oriented in mutually orthogonal directions, and accordingly the positions of terminals in pairs are separated 90 degrees from one another around the rotational center of the motor. FIGS.
8
(
a
) and
8
(
b
) show a comparison between the above motor structure with four poles of magnets and six poles of cores and an ordinal motor structure with two poles of magnets and three poles of cores. FIG.
8
(
a
) indicates the motor structure with two poles of magnets and three poles of cores, in which brush sections
30
in a pair are generally in parallel with each other, and terminals
31
in a pair are located relatively close to each other. FIG.
8
(
b
) indicates the motor structure with four poles of magnets and six poles of cores. Since brush sections
30
in a pair extend in directions at generally 90 degrees to each other, terminals
31
in a pair are widely separated from each other. For this reason, external connection members such as lead wires are disposed separated from each other, which becomes to be an obstacle to automated and more efficient wiring works. Furthermore, the conventional examples indicated in
FIGS. 9 and 10
have a disadvantage in that the shape of the terminals becomes complicated when the positions of the terminals in pairs are converged in order to automate and improve efficiency of wiring works.
SUMMARY OF THE INVENTION
The present invention has been made to solve the problems of the conventional technology, and therefore the present invention provides a motor with brush that can prevent the positions of brush terminals and brush sections from being changed by heat caused by soldering when external connection members such as terminals and lead wires are soldered to the brush terminals.
The present invention also provides a motor with brush that can increase the fixing strength of a brush terminal that is boned to a brush section in a unitary fashion.
The present invention further provides a motor with brush in which terminals of the motor to be connected to external connection members can be readily arranged in any optional positions without being restricted by mutual positions of two brush sections in a pair, and terminals to be connected to external connection members can be lead out to an external circumferential side or a rear surface side of the motor depending on the requirements.
In accordance with an embodiment or the present invention, a motor with brush is equipped with a brush section and a brush terminal that is connected to the brush section in a unitary fashion, wherein the brush terminal may include a brush connecting section having a plane that is connected to the brush section, and a bent section that is bent in a direction orthogonal to an axial direction of a rotary shaft of the motor. The bent section restricts the positions of the brush terminal and the brush section.
By forming the bent section at the brush terminal in a manner described above, the bent section function as a stopper section to prevent the position of brush section from moving in the axial direction, and prevents the positions of the brush terminal and the brush section from moving by heat caused by soldering when external connection members are soldered to the brush terminal.
In the above embodiment, the external connection member may preferably be connected to the bent
Akabane Makoto
Katagiri Masayuki
Comas Yahveh
Hogan & Hartson LLP
Sankyo Seiki Mfg. Co. Ltd.
Tamai Karl
LandOfFree
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