Electrical generator or motor structure – Dynamoelectric – Rotary
Reexamination Certificate
2002-04-11
2003-12-09
Ramirez, Nestor (Department: 2834)
Electrical generator or motor structure
Dynamoelectric
Rotary
C310S179000, C310S180000, C310S184000, C310S201000
Reexamination Certificate
active
06661146
ABSTRACT:
This application is based on Application No. 2001-160392, filed in Japan on May 29, 2001, the contents of which are hereby incorporated by reference.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an automotive alternator provided with a stator in which a stator winding is installed in a stator core having two slots per phase per pole, and particularly relates to a stator construction in which a stator winding constructed by connecting together winding phase portions having a phase difference corresponding to an electrical angle of 30 degrees is installed.
2. Description of the Related Art
FIG. 24
is a longitudinal section showing a first conventional automotive alternator,
FIG. 25
is a perspective showing a first stator used in the first conventional automotive alternator, and
FIG. 26
is a circuit diagram showing an electric circuit in the first conventional automotive alternator.
In
FIGS. 24 and 25
, a first conventional automotive alternator includes: a case
3
constituted by a front bracket
1
and a rear bracket
2
made of aluminum; a shaft
6
disposed inside the case
3
, a pulley
4
being secured to a first end portion of the shaft
6
; a Lundell-type rotor
7
secured to the shaft
6
; fans
5
secured to first and second axial end portions of the rotor
7
; a first stator
8
secured to the case
3
so as to envelop the rotor
7
; slip rings
9
secured to a second end portion of the shaft
6
for supplying electric current to the rotor
7
; a pair of brushes
10
sliding on surfaces of the slip rings
9
; a brush holder
11
for housing the brushes
10
; first and second rectifiers
12
A and
12
B electrically connected to the first stator
8
for converting alternating current generated in the first stator
8
into direct current; and a regulator
18
mounted to a heat sink
17
fitted onto the brush holder
11
, the regulator
18
adjusting the magnitude of the alternating voltage generated in the first stator
8
.
The rotor
7
includes: a field winding
13
for generating magnetic flux on passage of an electric current; and a pair of first and second pole cores
20
and
21
disposed so as to cover the field winding
13
, magnetic poles being formed in the first and second pole cores
20
and
21
by magnetic flux from the field winding. The first and second pole cores
20
and
21
are made of iron, each has six first and second claw-shaped magnetic poles
22
and
23
each having a generally trapezoidal outermost diameter surface shape disposed on an outer circumferential edge portion at even angular pitch in a circumferential direction so as to project axially, and the first and second pole cores
20
and
21
are fixed to the shaft
6
facing each other such that the first and second claw-shaped magnetic poles
22
and
23
intermesh. In other words, the number of magnetic poles in this rotor
7
is twelve.
The first stator
8
is constituted by: a cylindrical stator core
15
composed of a laminated body of magnetic plates; and a first stator winding
16
installed in the stator core
15
.
The first stator
8
is held between the front bracket
1
and the rear bracket
2
so as to form a uniform air gap between outer circumferential surfaces of the claw-shaped magnetic poles
22
and
23
and an inner circumferential surface of the stator core
15
. Seventy-two slots
15
a
opening onto an inner circumferential side are formed in the stator core
15
at an even angular pitch in a circumferential direction. In other words, the slots
15
a
are formed at a ratio of two per phase per pole, adjacent pairs of the slots
15
a
having a phase difference corresponding to an electrical angle of 30 degrees.
The first stator winding
16
is constituted by an a-phase winding phase portion
30
a
, a b-phase winding phase portion
30
b
, a c-phase winding phase portion
30
c
, a d-phase winding phase portion
30
d
, an e-phase winding phase portion
30
e
, and an f-phase winding phase portion
30
f
in each of which a continuous wire is installed in a wave shape in every sixth slot
15
a
. The a-phase winding phase portion
30
a
, the b-phase winding phase portion
30
b
, and the c-phase winding phase portion
30
c
are formed into a Y connection, constituting a first three-phase alternating current winding
160
A, and the d-phase winding phase portion
30
d
, the e-phase winding phase portion
30
e
, and the f-phase winding phase portion
30
f
are formed into a Y connection, constituting a second three-phase alternating current winding
160
B. The first and second three-phase alternating current windings
160
A and
160
B are connected to the first and second rectifiers
12
A and
12
B, respectively, constituting the electric circuit shown in FIG.
26
.
A specific construction of the first stator winding
16
will now be explained with reference to
FIGS. 27A
to
28
.
First, as shown in
FIG. 27A
, a first annular winding unit
33
a
is prepared by winding two conductor wires
32
each composed of a continuous copper wire having a circular cross section coated with an electrical insulator for a predetermined number of winds, and a second annular winding unit
33
b
is prepared by continuing to wind the two conductor wires
32
for a predetermined number of winds. Next, as shown in
FIG. 27B
, first and second intermediate star-shaped winding units
34
A and
34
B composed of two conductor wires are prepared by forming each of the first and second annular winding units
33
a
and
33
b
into a star shape in which adjacent pairs of slot-housed portions
34
a
are alternately joined on an inner circumferential side and an outer circumferential side by coil end portions
34
b
. Next, the first and second intermediate star-shaped winding units
34
A and
34
B are folded over at a linking portion of the conductor wires
32
where the first and second intermediate star-shaped winding units
34
A and
34
B are linked, and as shown in
FIG. 27C
, a star-shaped winding unit
35
is prepared by stacking the first and second intermediate star-shaped winding units
34
A and
34
B on top of one another such that the slot-housed portions
34
a
are superposed and the coil end portions
34
b
face each other in a radial direction.
A first star-shaped winding unit
35
prepared in this manner is mounted to the stator core
15
such that each of the slot-housed portions
34
a
is housed in Slot Numbers
1
,
7
, etc., through
67
of the slots
15
a
and such that the winding ends thereof extend outward from Slot Numbers
1
and
7
of the slots
15
a
, becoming the a-phase winding phase portion
30
a
. A second star-shaped winding unit
35
is mounted to the stator core
15
such that each of the slot-housed portions
34
a
is housed in Slot Numbers
2
,
8
, etc., through
68
of the slots
15
a
and such that the winding ends thereof extend outward from Slot Numbers
38
and
44
of the slots
15
a
, becoming the d-phase winding phase portion
30
d
. A third star-shaped winding unit
35
is mounted to the stator core
15
such that each of the slot-housed portions
34
a
is housed in Slot Numbers
3
,
9
, etc., through
69
of the slots
15
a
and such that the winding ends thereof extend outward from Slot Numbers
15
and
21
of the slots
15
a
, becoming the c-phase winding phase portion
30
c
. A fourth star-shaped winding unit
35
is mounted to the stator core
15
such that each of the slot-housed portions
34
a
is housed in Slot Numbers
4
,
10
, etc., through
70
of the slots
15
a
and such that the winding ends thereof extend outward from Slot Numbers
28
and
34
of the slots
15
a
, becoming the f-phase winding phase portion
30
f
. A fifth star-shaped winding unit
35
is mounted to the stator core
15
such that each of the slot-housed portions
34
a
is housed in Slot Numbers
5
,
11
, etc., through
71
of the slots
15
a
and such that the winding ends thereof extend outward from Slot Numbers
5
and
11
of the slots
15
a
, becoming the b-phase winding phase portion
30
b
. And a sixth star-shaped winding un
Asao Yoshihito
Oohashi Atsushi
Mitsubishi Denki & Kabushiki Kaisha
Mohandesi Iraj A.
Ramirez Nestor
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