JP3196334B2 - Field rotation type rotary electric machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a field rotating electric machine.

[0002]

2. Description of the Related Art As a vehicle alternator, a synchronous generator (hereinafter also referred to as an alternator) generally having a field coil wound around a field iron core which is integrally rotatably fitted to a drive shaft.
Is often used. In this type of field rotating electric machine,
As can be seen from a comparison between the stationary state of FIG. 4 and the rotating state of FIG. 5, the tip 63 of the claw 63a of the field iron core 6a is rotated.
b is displaced in the centrifugal direction by the centrifugal force, and therefore, it is necessary to previously set a large gap d between the field iron core 6a and the armature iron core 4a.

The Japanese Utility Model Application No. 58-495 filed by the present applicant
No. 79 proposes to improve the rigidity of the pillar portion and the claw portion by providing a rib on the inner end face of each base end portion of the pillar portion and the claw portion of the field iron core in order to improve the above problem. ing.

[0004]

SUMMARY OF THE INVENTION In order to make the engine room of a vehicle narrower and increase the electric load of the vehicle in recent years, the output of the vehicle alternator is increased while the size and weight are kept constant. Or a reduction in physique and weight with constant output.

The inventor of the present invention has made it possible to remarkably improve the generated power and the power generation efficiency by reducing the gap d in this type of field rotating type rotary electric machine. I realized that if the centrifugal displacement of the claw could be suppressed, the output per physique and weight could be increased. However, it was found that merely increasing the cross-sectional area of the field iron core offsets the increase in output due to the suppression of the centrifugal displacement of the claw as described above.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a field rotating type rotating electric machine having an improved physique and an output ratio per weight.

[0007]

According to a first aspect of the present invention, there is provided a housing, a drive shaft rotatably fitted in the housing, a cylindrical armature core disposed in the housing, and An armature coil wound around an armature core;
A field iron core fitted to the drive shaft so as to be integrally rotatable and facing the field iron core via a predetermined gap, and a field generation source provided in the field iron core; The iron core has a cylindrical portion fitted to the drive shaft, a column extending radially from both ends of the cylindrical portion, and a plurality of claws extending axially from the distal ends of both columns. In the field rotating type rotating electric machine, the outer end surfaces of the cylindrical portion, the column portion and the claw portion are displaced in a centrifugal direction.
It is characterized by having a rib extending continuously . According to a second aspect of the present invention, a field rotation according to the first aspect is provided.
In the rotary electric machine, the rotor may further include a cooling fan.
And a rectifier interposed between the cooling fan and the field core.
A plate, wherein the cooling fan and the current plate are provided with the ribs.
It is characterized by having an embossed portion that fits with the.

[0008] A field coil or a permanent magnet can be employed as a field magnetic flux generating source.

[0009]

The field core has a cylindrical tubular portion fitted to the drive shaft, a column extending radially from both ends of the cylindrical portion, and a plurality of columns extending axially from both ends of the column. With the claw portion, the tip of the cantilever-shaped claw portion is displaced by centrifugal force and approaches the armature core. This centrifugal displacement of the pawl axially displaces the tip of the cantilevered column.

The ribs extending in the centrifugal direction on the outer end face of the pillar portion, which characterize the present invention, increase the rigidity of the tip portion of the pillar portion against the axial displacement, and as a result, the tip of the claw portion The displacement of the portion in the centrifugal direction is reduced, and the reduction of the gap between the claw portion and the inner peripheral surface of the armature core due to rotation is reduced.

[0011]

As described above, according to the present invention, since the rib is extended in the centrifugal direction on the outer end face of the column of the field core, the displacement of the tip of the claw in the centrifugal direction is reduced. In addition, the reduction of the gap between the claw portion and the inner peripheral surface of the armature core due to the rotation is reduced. Therefore, the gap can be designed to be reduced in advance, and the output can be increased by reducing the gap at the time of middle and low speed rotation.

Further, the cross section of the pillar portion is deformed by the rib, and the rigidity per weight of the pillar portion is increased as compared with simply increasing the axial dimension of the pillar portion. In addition, the ribs extending in the centrifugal direction on the outer end face of the pillar portion function as a centrifugal fan when rotating, and the field core along the outer end face of the pillar portion, etc.
Along with the occurring centrifugal cooling air for cooling the, ribs and field
Since the heat transfer with the iron core is also good,
And the cooling effect of the field core is improved without complicating the structure .

[0013]

FIG. 1 shows an embodiment of a field rotating type rotating electric machine according to the present invention. This generator is a so-called alternator, which is a three-phase AC generator disposed in front of a vehicle engine (not shown) in the engine room of the vehicle. The housing includes a rear housing 2 joined to the rear end opening to close the internal space S. A drive shaft 3 is rotatably supported by bearings 30 on the front housing 1 and the rear housing 2.

A cylindrical armature core 4 is fitted and fixed to the inner surface of the peripheral wall of the rear housing 2, and an armature coil 5 is wound around the armature core 4. Two field iron cores 6 and 6 are fitted on the drive shaft 3 so as to be integrally rotatable, and a field coil (field magnetic flux generating source in the present invention) 7 is fitted between the two field iron cores 6. Is equipped. The two-field iron cores 6 are respectively located inside the armature iron core 4 and fitted to the center of the drive shaft 3, and extend radially from both ends of the cylindrical part 61. And the same number of claw portions 63 extending in the axial direction from the distal end portions of the two column portions 62 toward the opposing column portion 62 to form magnetic poles. The surface and the left end surface of the cylindrical portion 61 on the right side in the axial direction are joined.

The claws 63 are alternately located at predetermined intervals in the circumferential direction from both pillars 62, and each taper 63 is gradually tapered in the axial direction. The field coil 7 has a cylindrical portion 61.
And the claw portion 63 surrounds the field coil 7.
A pulley 31 driven by a vehicle engine (not shown) is fitted to a front end of the drive shaft 3 outside the front housing 1, and a cooling fan 8 is mounted on both column portions 62 of the field core 6. Has been fixed.

A resin cover 9 is fixed to the rear housing 2 so as to surround the rear end surface of the rear housing 2.
A brush 91 for supplying a field current to the field coil 7
A slip ring 92 is fitted on the drive shaft 3 in contact with the brush 91. Also, the rear cover
A voltage regulator 93 for adjusting the output by the field current control and a rectifier 94 for three-phase full-wave rectification of the output voltage from the armature coil 5 are provided in 9.

In this alternator, a three-phase AC voltage is generated in the armature coil 5 by the rotation of the drive shaft 3 and the energization of the field current to the field coil 7 as in the prior art. In addition to the rectification, the voltage regulator 93 controls the field current to adjust the generated voltage. Hereinafter, features of this embodiment will be described in detail with reference to FIGS.

FIG. 2 shows the field core 6 at rest and the axial cross section of the right cooling fan 8 in the drawing. FIG. 3 is a front view of the field core 6 at rest before the cooling fan 8 is attached. Show. A rib 65 extends in the centrifugal direction on the outer end surface of the column portion 62 of the two-field iron core 6. One rib 65 is provided for each pillar 65.
Each of them is formed by integral cutting when cutting the field core 6. Of course, it can be formed by integral casting or a plurality of pieces. The height (axial dimension) of the rib 65 is 6 mm, and the circumferential width is 5 mm. The rib 65 is formed from the vicinity of the drive shaft 3 of the cylindrical portion 61 to the tip of the column portion 62.
The cross section of the rib 65 is substantially semicircular.

Further, as shown in FIG. 1, a cooling fan 8 is fixed to the outer end surface of the left column 62 by spot welding, and as shown in FIG. The current plate 80 and the cooling fan 8 are fixed by spot welding. The flow straightening plate 80 and the cooling fan 8 welded to the right column 62 will be further described with reference to FIG. The current plate 80 is a metal disk having a thickness of about 0.4 mm, and has a semi-cylindrical embossed portion (not shown) into which the rib 65 just fits by embossing. The rectifying plate 80 has a rectifying function of refracting the cooling air W blown in the axial direction from the left cooling fan 8 in the centrifugal direction.

The cooling fan 8, which is welded over the current plate 80, has a disk 81 having substantially the same shape as the current plate 80.
And a fan 82 formed by cutting out the outer peripheral portion of the disk 81. Further, the disk 81 has a semi-cylindrical embossed portion 83 to which the embossed portion of the current plate 80 just fits radially. Note that the cutout position of the fan 82 is set between the adjacent embossed portions 83.

As a result, the projecting portion of the rectifying plate 80 and the projecting portion 83 of the cooling fan 8 are fitted to the rib 65, so that the rib 65 also performs a function of preventing the rectifying plate 80 and the cooling fan 8 from rotating. The number of spot welds between the plate 62, the current plate 80, and the cooling fan 8 can be minimized.
Furthermore, since the above-mentioned embossed portion 83 fitted to the rib 65 extends in the radial direction, it has a centrifugal fan function and is effective for improving the cooling of the field core and the like. Of course, this may have a cross-sectional shape other than a semi-cylindrical shape of the embossed portion.

On the other hand, in FIG. 1, the left cooling fan 8 (FIG. 2)
(Not shown in the figure) does not have the rectifying plate 80, so that the ejection portion is slightly smaller than the ejection portion 83 of the right cooling fan 8, but the operation and effect are the same.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of a field rotary electric machine according to the present invention;

FIG. 2 is a sectional view of the field core of FIG. 1;

FIG. 3 is a front view of the field core of FIG. 1;

FIG. 4 is a schematic cross-sectional view of a conventional field core (when stopped);

FIG. 5 is a schematic cross-sectional view of a conventional field iron core (at high speed rotation).

[Explanation of symbols]

1, 2 is a housing, 3 is a drive shaft, 4 is an armature core, 5
Is an armature coil, 6 is a field iron core, 7 is a field coil (field magnetic flux generating source), 61 is a cylinder, 62 is a column, 63 is a claw, 6
5 is rib

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H02K 1/00-1/16 H02K 1/18-1/26 H02K 1/28-1/34 H02K 19 / 00-19/38 H02K 29/00-29/14

Claims (2)

(57) [Claims] 1. A housing, a drive shaft rotatably fitted in the housing, a cylindrical armature core disposed in the housing, an armature coil wound around the armature core, A field iron core fitted to the drive shaft so as to be integrally rotatable and facing the field iron core via a predetermined gap, and a field generation source provided in the field iron core; The iron core has a cylindrical portion fitted to the drive shaft, a column extending radially from both ends of the cylindrical portion, and a plurality of claws extending axially from the distal ends of both columns. A field rotating type rotating electrical machine comprising: a rib continuously extending in a centrifugal direction on outer end surfaces of the cylindrical portion, the column portion, and the claw portion . 2. The electric field rotary type rotating electric machine according to claim 1,
hand, The rotor includes a cooling fan, and the cooling fan and the magnetic field.
It has a straightening plate interposed between the iron cores, The cooling fan and the current plate are fitted with the rib.
Field rotating type rotary electric machine characterized by having an embossed portion
Machine.