Electrical generator or motor structure – Dynamoelectric – Rotary
Reexamination Certificate
2001-09-28
2004-03-02
Waks, Joseph (Department: 2834)
Electrical generator or motor structure
Dynamoelectric
Rotary
C029S596000
Reexamination Certificate
active
06700275
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a D.C. motor and a winding method for coils of the D.C. motor, wherein the stator coils of the motor can be conveniently wound to thereby construct a stator of a D.C. motor.
2. Description of the Related Art
FIG. 7
of the drawings illustrates a conventional D.C. motor stator
90
formed by a radial winding method. In the winding method for the stator
90
, an end of a conducting wire
901
forms a first connection V
1
before the winding procedure. When the conducting wire
901
has been wound around a half number of the pole arms, i.e., pole arms
90
a
and
90
b
of the stator
90
, the winding procedure is halted for pulling out the conducting wire
901
to form a second connection V
0
(the common connection). Then, the winding procedure continues for the remaining of the pole arms (i.e., pole arms
90
c
and
90
d
). After the winding procedure is finished, the other end of the conducting wire
901
forms a third connection V
2
. The stator
90
may use a dual-coil motor driver to generate alternating rotational magnetic fields to thereby drive the rotor having magnetic poles N and S. Nevertheless, the winding procedure must be interrupted for formation of the second connection V
0
.
FIG. 8
illustrates a stator
91
using another conventional radial winding method. An end of a conducting wire
911
forms a first connection V
1
before winding around the stator
91
. After the winding procedure is finished, the other end of the conducting wire
911
forms a second connection V
2
. The stator
91
may use a single-coil motor driver and supplies the single coil with alternating electric current to generate alternating rotational magnetic fields to thereby drive the rotor having magnetic poles N and S. Nevertheless, in this method using a single conducting wire
911
for carrying out winding, the conducting wire
911
must be wound around each pole arm
91
a
,
91
b
,
91
c
,
91
d
for as many turns as the required turns of the coil. The winding time for the stator
91
cannot be reduced, as the winding speed is limited.
Another previously proposed D.C. motor, as illustrated in
FIG. 9
of the drawings of the present application, comprises a stator
92
having a number of pole arms
92
a
,
92
b
,
92
c
, and
92
d
around which two conductive wires are wound. Each conducting wire
921
,
922
needs to be wound for just a half of turns to finish winding of the stator
92
with required turns. After formation of the winding on the stator
92
, it can then be decided the number (two or three) of the connections to be connected with the drive circuit.
Each conducting wire of each of these brushless motors having a radial winding and a radial air gap is wound around each pole arm of the stator. The winding procedure is difficult and the winding speed is largely limited, as the gap between the pole arms is small. In addition, an insulating layer deposited on an outer periphery of the conducting wire tends to be damaged by the pole arms during the winding procedure, which results in a short circuit of the coils.
FIG. 10
of the drawings, which corresponds to
FIG. 4
of U.S. Pat. No. 4,922,162 to Shiraki et al. issued on May 1, 1990 and entitled ISK-TYPE SINGLE-PHASE BRSHELESS MOTOR, discloses a stator for a brushless motor having an axial gap. The coils
931
and
932
are firstly wound for the required turns and then bonded by tapes or bonding agents to the stator yokes
93
a
and
93
b
on a circuit board
93
. Each coil
931
,
932
has terminals
931
a
and
93
l
b
,
932
a
and
932
b
passing through V-shaped notches in the circuit board
93
. The terminal
931
a
,
931
b
,
932
a
,
932
b
are soldered to a printed conductor pattern formed on a lower face of the printed circuit board
20
so as to establish electric connection therebetween. The coils of such a conventional brushless motor having an axial air gap require careful soldering so as to avoid wrong connection although they can be wound easily.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a method for carrying out winding of a D.C. motor in which winding of the stator coils can be easily achieved and damage to the coils by the pole plates of the stator during the winding procedure can be avoided.
It is another object of the present invention to provide a D.C brushless motor having stator coils that can be easily fixed for easy processing and assembly.
A winding method in accordance with the present invention comprises winding a single conducting wire around a predetermined number of pegs in sequence to thereby form a stator coil assembly having even coils and two ends. The winding direction of each coil is opposite to a coil adjacent thereto. The stator coil assembly having even coils is mounted to a casing of a D.C. motor with the coils located corresponding to a permanent magnet of a rotor. The rotor having the permanent magnet is driven to turn by magnetic forces created as a result of energizing the coils.
Other objects, specific advantages, and novel features of the invention will become more apparent from the following detailed description and preferable embodiments when taken in conjunction with the accompanying drawings.
REFERENCES:
patent: 1406092 (1922-02-01), Schulz et al.
patent: 1451374 (1923-04-01), Rogers
patent: 4125792 (1978-11-01), Schmider
patent: 4380833 (1983-04-01), Peters
patent: 4446393 (1984-05-01), Finegold
patent: 4803389 (1989-02-01), Ogawa et al.
patent: 4883981 (1989-11-01), Gerfast
patent: 4922162 (1990-05-01), Shiraki et al.
Hong Ching-Shen
Horng Alex
Yin Tso-Kuo
Bacon & Thomas PLLC
Sunonwealth Electric Machine Industry Co. Ltd.
Waks Joseph
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