Electrical generator or motor structure – Dynamoelectric – Rotary
Reexamination Certificate
2000-07-27
2001-09-04
Enad, Elvin (Department: 2834)
Electrical generator or motor structure
Dynamoelectric
Rotary
C310S0400MM, C310S051000, C310S219000, C310S220000, C310S233000, C310S234000, C310S235000, C310S261100, C310S268000
Reexamination Certificate
active
06285109
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a small brush DC motor of a 4-6 (4-magnetic-pole-6-salient-pole) structure comprising a varistor for extinguishing spark arcs and more particularly to means for winding wire around an armature core.
2. Related Art
As shown in
FIG. 5
, generally, in a structure of an armature
50
of a small brush DC motor of a 4-6 (4-magnetic-pole-6-salient-pole) structure, for wiring of coils
53
wound around six radially projecting salient poles
52
of an armature core
51
and six risers
55
electrically conducting as terminals of six commutators
54
, a circuit is previously formed with a substrate or electrode print pattern
57
(hatched portion in the figure) formed as a thick film on one side of a ring varistor
56
, the windings of the coils
53
wound around the six salient poles
52
are connected to the six risers
55
extended from the corresponding six commutators
54
, and the electrode print pattern
57
of the ring varistor
56
are joined to the faces of the risers
55
by soldering
58
, forming the armature
50
.
The electrode print pattern
57
illustrated in
FIG. 5
is a circuit pattern conducting so that a pair of two long and short risers formed interposing the rotation center of the armature therebetween becomes the same potential; three circuit patterns for the three pairs of riser are formed in the same shape and electrically independent of each other.
That is, the circuit pattern for electrically connecting a pair of risers, for example, extends from one long riser round the outside of a short riser in another pair adjacent to the pair through the lower side of a long riser in still another pair adjacent the pair to the associated short riser. The three circuit print patterns
57
are formed on one side of the ring varistor
56
and a pair of long and short risers is connected by soldering
58
for each print pattern
57
. Further, the three circuit patterns are placed so as to separately contain three electrodes disposed in the ring varistor
56
and are electrically connected.
The above-described wiring structure uses the circuit formed in the ring varistor
56
as a part of a current diverting circuit of the coil
53
by the commutator
54
.
However, to flatten and miniaturize a motor, it is difficult to place the electrode print pattern
57
in the ring varistor
56
and the ring varistor
56
is specifically designed and manufactured; it is unavoidable that the product becomes expensive.
Further, if the electrode print pattern
57
placed in the ring varistor
56
becomes small, it easily comes in contact with another pattern and positioning accuracy with the risers
55
becomes strict; it is feared that an electric short circuit may be produced when coil terminals are connected or soldered.
SUMMARY OF THE INVENTION
It is therefore an object of the invention to apply a normal ring varistor provided with three electrodes used with a general armature of a 2-3 (2-magnetic-pole-3-salient-pole) structure having three electrode parts in an armature in a 4-6 structure. It is accomplished by a coil winding method around salient poles that a normal 3-electrode varistor provides an overvoltage suppression effect equal to that of a varistor specifically designed for an armature of a 4-6 structure.
It is more particularly to solder three of six risers directly to three electrodes of a varistor together with coil winding terminals and solder only coil winding terminals to the remaining three risers each between the electrodes of the varistor for forming an armature, in short, route a coil winding around salient poles in a manner of drawing with a single stroke of a brush containing connection to the risers.
According to an aspect of the present invention, there is provided a small motor comprising:
an armature having six salient poles radially and a coil wound around the salient poles;
six risers connected to said coil;
commutators being joined to said risers in a one-to-one correspondence;
a ring varistor being connected to said riser for suppressing overvoltage;
a brush coming in sliding contact with said commutator for supplying a current; and
a permanent magnet having four magnetic poles, placed facing the salient poles,
wherein said coil includes one wire wound continuously around the six salient poles and the six risers from a winding start terminal to a winding end terminal and said ring varistor is provided with three electrode parts to which alternate three of said six risers are connected.
As described above, according to the small motor according to the invention, a general ring varistor used with an armature of a 2-3 (2-magnetic-pole-3-salient-pole) structure can be applied to a device for extinguishing spark arcs for suppressing overvoltage of an armature of a 4-6 (4-magnetic-pole-6-salient-pole) structure without special working and moreover a special wiring pattern is not used, thus part-to-part accuracy is not required and the structure and parts management can be simplified sufficiently.
Because of coil winding according to a pattern drawn with a single stroke of a brush, automation is facilitated and productivity can be improved. Further, the varistor can be miniaturized, so that the armature itself can be well fitted to miniaturization.
REFERENCES:
patent: 4420704 (1983-12-01), Mabuchi
patent: 4769566 (1988-09-01), Matsuda
patent: 4859893 (1989-08-01), Wang
patent: 4983866 (1991-01-01), Lok
patent: 5095239 (1992-03-01), Wang
patent: 5293092 (1994-03-01), Strobl
patent: 5473212 (1995-12-01), Crook et al.
patent: 5796203 (1998-08-01), Wang
patent: 5895990 (1999-04-01), Lau
Katagiri Masayuki
Takei Hiromitsu
Enad Elvin
Kabushiki Kaisha Sankyo Seiki Seisakusho
Sughrue Mion Zinn Macpeak & Seas, PLLC
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