Title of Invention

STATOR FOR VEHICULAR ROTATING ELECTRICAL MACHINE

Abstract A stator for a vehicular rotating electrical machine includes a cylindrically. shaped stator core (31) formed by a plurality of laminated bodies (310, 320, 330) stacked and secured together in an axial direction thereof. Each of the laminated bodies is formed by a plurality of core sheets (310A) laminated together, and each of the core sheets is formed by a plurality of core sheet segments separated along a circumferential direction of the core sheet. For every one of the laminated bodies, separating positions (310E) arranged along the circumferential direction of the plurality of core sheet segments of one of the core sheets and separating positions arranged along the circumferential direction of the plurality of core sheet segments of the adjacent core sheet are aligned with each other in the axial direction of the stator core.
Full Text

STATOR FOR VEHICULAR ROTATING ELECTRICAL MACHINE
The present invention relates to a stator for a vehicular rotating electrical machine such as alternating-current (AC) generator installed in a passenger car, truck and the like.
A stator for a vehicular rotating electrical machine such as AC generator is known comprising a stator core formed from a strip of magnetic steel spirally coiled or stacked and welded into a cylindrical lamination (Japanese Patent Laid-open Publication (JP-A) No. 2003-37951). Another known stator includes a stator core composed of a number of core sheets each having a pair of core sheet halves or segments joined together and stacked into a lamination such that joint portions of adjacent core sheets are offset from one another (U. S. Patent No. 5,256,926).
The stator core used in the stator shown in JP 2003-37951A is, however, expensive to manufacture as it requires a large-sized equipment for spirally coiling a magnetic steel strip and a time-consuming setup process for introducing the magnetic steel strip into the coiling equipment.
The stator core used in the stator shown in U. S. Patent No. 5,256,926 also has a problem that adjacent layers of core sheets are slightly offset from one another in a circumferential direction thereof and, hence, edges of the individual core sheets jointly defining one side surface of each slot are out of alignment with one another and form a irregular or corrugated slot surface, tending to deteriorate the electric insulation properties of the stator. For instance, when the slots of the stator core are coated with an anticorrosive paint, those edges of the core sheets which form projections of the corrugated or irregular side surface of each slot have a relatively thin layer of anticorrosive paint and hence are likely to expose the material of the core sheets.

Furthermore, when an insulating member or insulator is placed in the slots to provide an electric insulation between the core sheets and a stator winding, the projecting edges of the core sheets are likely to engage and hence damage the insulator. Such deterioration of the electric insulation properties is objectionable because it leads to deterioration of output performance and durability.
With the foregoing difficulties in view, the present invention seeks to provide a stator for a vehicular rotating electrical machine, which is able to realize downsizing of a manufacturing equipment and simplification of a setup process, and is easy to secure high electric insulation properties.
To achieve the foregoing object, there is provided according to a first aspect of the present invention a stator for a vehicular rotating electrical machine, comprising: a cylindricallyshaped stator core formed by a plurality of laminated bodies stacked and secured together in an axial direction of the cylindricallyshaped stator core! and a stator winding wound on slots of the stator core, wherein each of the plurality of laminated bodies is formed by a plurality of core sheets laminated together, wherein each of the core sheets is formed by a plurality of core sheet segments separated along a circumferential direction of the core sheet, and wherein for every one of the laminated bodies, separating positions arranged along the circumferential direction of the plurality of core sheet segments of one of the core sheets and separating positions arranged along the circumferential direction of the plurality of core sheet segments of the adjacent core sheet are aligned with each other in the axial direction of the stator core.
By thus aligning the separating positions of the plurality of core sheet segments, it is possible to eliminate irregularities (projections and recesses) on the peripheral surfaces of individual slots formed by the laminated core sheets

each formed by the plurality of core sheet segments. The peripheral surfaces of the slots, which are substantially free from projections, ensure high electric insulation properties of the stator. Furthermore, use of the core sheet segments obviates the need for a large-sized equipment, which is conventionally used for spirally coiling a strip of magnetic steel into a cylindrical lamination. This will enable downsizing of the manufacturing equipment and simplification of the setup process.
Preferably, the separating positions arranged along the circumferential direction of the core sheet segments in one laminated body are offset in the circumferential direction from the separating positions of the core sheet segments in the adjacent laminated body, and the core sheet segments in said one laminated body and the core sheet segments in the adjacent laminated body are out of phase with (or circumferentially shifted) from each other and connected together when the plurality of laminated bodies are joined together.
Since joining of the plurality of laminated bodies concurrently achieves joining of the circumferentially arranged core sheet segments, there is no need for the core sheet segments to have a separate joining means or structure. This arrangement allows for simplification of the configuration and joining structure of the core sheet segments (and more particularly the mating surfaces of the core sheet segments).
Preferably, each of the laminated bodies has an outer peripheral surface of smooth cylindrical shape, which is free from irregularities at mating surfaces of the plurality of core sheet segments. By thus providing the smooth cylindrical outer peripheral surface for each laminated body, it is possible to prevent water from entering and staying at the mating surfaces of the adjacent core sheet segments, thereby improving the environmental resistance of the stator.

It is preferable that each of the core sheet segments has a plurality of rivet holes for insertion therethrough of a corresponding number of rivets, and the plurality of laminated bodies are joined together by the rivets inserted through the respective rivet holes. By virtue of the riveting, the laminated bodies each having a smooth outer peripheral surface can be easily joined together.
According to a second aspect of the invention, there is provided a stator for a vehicular rotating electrical machine, comprising: a cylindricallyshaped stator core formed by a number of core sheets laminated together in an axial direction of the cylindricallyshaped stator core! and a stator winding wound on slots of the stator core, wherein each of the plurality core sheets is formed by a plurality of core sheet segments separated along a circumferential direction of the core sheet, and wherein the plurality of core sheet segments have separating positions arranged along the circumferential direction thereof, the separating positions being set to shift in the circumferential direction of the core sheet segments for each of a plurality of groups of adjacent core sheets of the laminated core sheets.
In each group of adjacent core sheets, the separating positions of the plurality of core sheet segments of one core sheet and the separating positions of the plurality of core sheet segment of the adjacent core sheet are aligned with each other in the axial direction of the stator core. By thus aligning the separating positions of the plurality of core sheet segments, it is possible to eliminate irregularities (projections and recesses) on the peripheral surfaces of individual slots formed by the group of core sheets each formed by the plurality of core sheet segments. The peripheral surfaces of the slots, which are substantially free from projections, ensure high electric insulation properties of the stator. Furthermore, use of the core sheet segments obviates the need for

a large-sized equipment, which is conventionally used for spirally coiling a strip of magnetic steel into a cylindrical lamination. This will enable downsizing of the manufacturing equipment and simplification of the setup process.
Furthermore, since the separating positions of the plurality of core sheet segments are set to shift in the circumferential direction of the core sheet segments for every plural pieces of adjacent core sheets of the laminated core sheets, the stator core as a whole has a higher mechanical strength than a stator core of the type wherein separating positions of the core sheet segments are aligned in the axial direction of the stator core. Additionally, by thus shifting the separating positions, it is possible to increase the environmental resistance because the separating positions, which are likely to encounter water infiltration, are distributed in the circumferential direction.
Preferably, the core sheet segments separated in the circumferential direction thereof are identical in configuration. With the core sheet segments thus configured, it is possible to reduce the number of component parts used and increase the productivity of the stator core.
It is preferable that the stator core includes an unsegmented core sheet having a continuous ring-like configuration corresponding in shape to a ring-like configuration formed by the plurality of core sheet segments circumferentially connected together end to end. The unsegmented core sheet is placed on the plurality of core sheet segments at one or both of opposite axial end faces of the stator core. By virtue of the unsegmented core, it is possible to preclude an uneven clamp load problem, which may otherwise occur due to the presence of a slight level difference between two adjacent ones of the plurality of core sheet segments when the stator core is secured to a frame by means of bolts.
One preferred structural embodiment of the present invention will be

described in detail herein below, by way of example only, with the reference to the accompanying drawings, in which:
Fig. 1 is a cross-sectional view showing the general configuration of a vehicular AC generator incorporating therein a stator embodying the present invention!
Fig. 2 is a side view showing a stator core of the stator;
Fig. 3 is a plane view of the stator core shown in Fig. 2;
Fig. 4 is a plan view showing a core sheet segment of the stator core!
Fig. 5 is an enlarged cross-sectional view of a portion of a slot in the stator core according to the present invention;
Fig. 6 is a view similar to Fig. 5, but showing a portion of a slot in the conventional stator core formed from a strip of magnetic steel spirally coiled into a cylindrical lamination;
Fig. 7 is a side view showing a stator core according to a modification of the present invention;
Fig. 8 is a view similar to Fig. 7, but showing another modified form of the stator core according to the invention;
Fig. 9 is a view similar to Fig. 7, but showing a stator core provided with unsegmented core sheets according to still another modification of the present invention; and
Fig. 10 is an enlarged view showing a part of the modified stator core of Fig. 9 as the stator core is in an assembled condition with respect to a front-side frame.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT One preferred structural embodiment of the present invention will be described in greater detail in conjunction with a vehicular AC generator shown

in Fig. 1. As shown in Fig. 1, the vehicular AC generator 1 as a vehicular rotating electrical machine generally comprises a rotor 2, a stator 3, a front-side frame 4, a rear-side frame 5, a brush unit 6, a rectifier 7, a voltage regulator 8, and a pulley 9.
The rotor 2 includes a field winding 21 formed from an insulated copper wire wound cylindrically and concentrically, and a pair of field cores 22 and 23 each having six pawl-shaped portions and arranged to hold the field winding 21 between the field cores 22 23 via a rotating shaft 24. The front-side field core 22 has an end face to which a cooling fan 25 is firmly attached by welding, for example, so that outside air is drawn as cooling air into the AC generator 1 from a front side (left side in Fig. 1) thereof and discharged from the AC generator 1 in both an axial direction and a radial outward direction thereof. Similarly, the rear-side field core 23 has an end face to which a cooling fan 26 is firmly attached by welding, for example, so that the outside air is drawn as cooling air into the AC generator 1 from a rear side (right side in Fig. l) thereof and discharged from the AC generator in a radial outward direction thereof.
The stator 3 includes a stator core 31, a three-phase stator winding 32, and an insulator 33 providing an electric insulation between the stator core 31 and the stator winding 32. The structure of the stator core 31 will be described later in greater detail.
The rectifier 7 is provided to rectify a three-phase alternating-current (AC) output voltage of the three-phase stator winding 32 of the stator 3 to thereby obtain direct-current (DC) output. The rectifier 7 includes a positive-pole-side heat sink, a negative-pole-side heat sink, and a plurality of rectifying devices attached by soldering, for example, to each of the positive-and negative-pole-side heat sinks.
The front-side frame 4 and the rear-side frame 5 cooperate with each

other in housing or accommodating the rotor 2 and the stator 3 in such a manner that the rotor 2 is rotatably supported in the stator 3 and rotatable about the axis of the rotating shaft 24 with a predetermined gap defined between the field cores 22, 23 of the rotor 2 and the stator 3. The stator 3 is secured to four support portions 420 of the front-side frame 4 by means of bolts 34. The support portions 420 are provided at equal intervals along a direction of rotation of the rotor 2.
The voltage regulator 7 is provided to control the exciting current of the field winding 21 for regulating the output voltage of the vehicular AC generator
1 so that the output voltage, which is variable with the electric load and
generated energy, is maintained at a substantially constant level. The pulley
9 is provided to transmit rotation of an engine (not shown) to the rotor 2 of the
vehicular AC generator 1. To this end, the pulley 9 is firmly secured to a
threaded end of the rotating shaft 24 (located on the opposite side of slip rings)
by means of a nut 91. A rear cover 10 is mounted to the rear-side frame 5 in
such a manner as to cover the brush unit 6, rectifier 7 and voltage regulator 8
for protection of these components 6-8.
Next, the stator core 31 will be described in detail with reference to Figs.
2 and 3. As shown in Fig. 2, the stator core 31 in the illustrated embodiment
is formed by three laminated bodies 310, 320 and 330 stacked or laminated one
above another in an axial direction (along a common central axis of the rotating
shaft 24 and the cylindrical stator core 31). Each of the laminated bodies 310,
320, 330 is formed by a plurality of layers of core sheets 310A stacked or
laminated together. Each of the core sheets 310A has a ring shape and is
formed from a steel plate (iron steel plate).
As shown in Fig. 3, each of the laminated bodies 310, 320, 330 has a plurality of slots 311 opening at an inner peripheral edge of the laminated body

310 (320, 330). The core sheets 310A, which form a single laminated body 310, 320, 330, are each formed by three core sheet segments 310B, 310C and 310D of identical configuration. The core sheet segments 310B, 310C, 310D is in the shape of an annular sector having a central angle of 120 degrees.
Fig. 4 shows the core sheet segment 310B on enlarged scale. As shown in this figure, the core sheet segment 310B has eleven slots 311 arranged in a circumferential direction thereof and opening at an inner peripheral edge thereof. Opposite end portions of the core sheet segment 310B are so configured as to have a slot half, which is formed by dividing a single slot 311 in a circumferential direction into two slot halves. Thus, when the core sheet segment 310B and an adjacent core sheet segment 310C or 310D are brought together end to end, a single slot 311 is formed between the adjoining end portions of the two adjacent core sheet segments 310B and 310C, or 310B and 310D. The core sheet segment 310B has four rivet holes 312 formed therein at regular three-slot intervals along an outer peripheral edge thereof. In the laminated body 310, plural such core sheet segments 310B have the same position in the circumferential direction of the laminated body 310, and the rivet holes 312 of the plural core sheet segments 310B extend through the thickness of the laminated body 310.
The core sheet segments 310C, 310D, which also form part of the laminated body 310, have the same configuration as the core sheet segment 310B and they are arranged in the same manner as the core sheet segment 310B. Each of the three core sheet segments 310B, 310C and 310D has an outer peripheral edge which is smooth arc-shaped configuration at a mating surface 310E between each adjacent pair of the core sheet segments 310B, 310C, 310D. Thus, when the core sheet segments 310B, 310C and 310D, each being in the form of a lamination formed by a plurality of core sheet segments 310B,

3IOC or 310D stacked one above another, are arranged into a circle, outer peripheral edges of the core sheet segments 310B, 310C and 310D as a whole form a smooth outer peripheral surface 310F (Fig. 3) of cylindrical configuration of the laminated body 310.
Although in the description given above only the laminated body 310 has been described in detail, it is apparent that the other laminated bodies 320 and 330 have the same construction as the laminated body 310. However, when the laminated bodies 310, 320 and 330 are assembled together, they are arranged such that the respective circumferential positions (positions of the mating surfaces 310E of the core sheet segments 310B, 310C and 310E) are 30 degrees out of phase. In this instance, since the rivet holes 312 are formed at a 30-degrees pitch (corresponding to a three-slots distance), they still extend through the overall thickness of the laminated bodies 310, 320, 330 regardless of the phase shift of the circumferential positions of the laminated bodies 310, 320, 330. A total of 12 rivets 340 are inserted through the rivet holes 312 and plain ends of the rivets 312 are hammered or deformed into a head to fasten together the three laminated bodies 310, 320 and 330 and a plurality of groups of core sheet segments 310B, 3 IOC, 310D forming each laminated body 310, 320, 330.
In the stator core 31 used in the stator 3 of the vehicular AC generator 1 according to the illustrated embodiment, the separating positions (i.e., the positions of the mating surfaces 310E) of the plural core sheet segments 310B, 310C and 310D are coincident or aligned with one another in the axial direction of the stator core 31. With this arrangement, peripheral surfaces of the individual slots 311 formed in the laminated core sheet segments 310B, 310C, 310D are flat and free from irregularities (projections and recesses). By thus reducing the number of edge-forming projections at the slots 311, it is readily

possible to secure high electric insulation properties of the stator core 31.
Fig. 5 shows on enlarged scale a part of one slot 311 formed in the stator core 31 according to the present invention, and Fig. 6 is a view similar to Fig. 5 but showing, for comparative purposes, a part of the conventional stator core SC including a slot SL formed by spirally coiling a strip of magnetic steel into a cylindrical lamination in the same manner as discussed above with reference to JP 2003-37951 A.
As shown in Fig. 5, the laminated body 310 includes three core sheet segments 310B, 310C, 310E each of which is in the form of a lamination formed by a plurality (five in the illustrated embodiment) of groups of core sheet segments 310B, 310C or 310D stacked together with their circumferential positions kept coincident with one another. Thus, assuming that the core sheet segments 310B, 3IOC, 310D of identical configuration are produced by the same manufacturing process, it is possible to eliminate irregularities (projections and recesses) on peripheral surface of the individual slots 311 of the laminated body 310 (cf. projections and recesses formed on peripheral surface of the slot SL of the conventional stator core SC shown in Fig. 6). The same can be said for the other laminated bodies 320, 330. Accordingly, except for a step portion formed at the boundary between two adjacent ones of the laminated bodies 310, 320, 330, irregularities on the peripheral surfaces of the slots 311 can be reduced to a minimum level. It is, therefore, possible to protect the insulator 33 against damage, which may otherwise occur when projections on the peripheral surfaces of the slots 311 engage the insulator 33 (cf. the positional relationship between an insulator IN and the projections on the peripheral surfaces of the slot SL shown in Fig. 6). In the case where the slots 311 are coated with an anticorrosive paint, there will be no risk that the anticorrosive paint layer becomes thin at portions corresponding to edges of the

projections on the peripheral surfaces of the slots 311, tending to allow the material of the core sheet segments 310B, 310C, 310D to be exposed in a short period of time.
Furthermore, by using the core sheet segments 310B, 310C, 310D of identical configuration, it is possible to obviate the need for a large-sized manufacturing equipment, which is used in the production of the conventional stator core SC shown in Fig. 6 for spirally coiling a strip of magnetic sheet into a cylindrical lamination. This will achieve downsizing of the manufacturing equipment and simplification of the setup process during manufacture of the stator core 31.
Additionally, since a plurality of sets of circumferentially arranged core sheet segments 310B, 310C, 310D are secured in position at the same time the plural laminated bodies 310, 320, 330 are fastened together by means of the rivets 340 (Fig. 2), there is no need to provide a separate means for joining the adjacent core sheet segments 310B, 310C, 310D. This leads to simplification of the configuration and joining structure of the core sheet segments 310B, 310C, 310D (and more particularly, the mating surfaces 310E (Figs. 2-4) of the core sheet segments 310B, 310C, 310D).
Each of the laminated bodies 310, 320, 330 has a smooth cylindrically shaped peripheral surface 310F (Fig. 3) which is free from irregularities (projections and recesses) at mating surfaces 310E between the adjacent core sheet segments 310B, 310C, 310D. This arrangement makes it possible to prevent water from entering and staying between mating portions of the adjacent core sheet segments 310B, 310C, 310D and the front-side frame 4. The environmental resistance of the stator core 31 can thus be improved.
Furthermore, the laminated bodies 310, 320, 330 are fastened together by means of the rivets 312 (Figs. 2 and 3) inserted through the rivet holes 312

(Fig. 4) formed in each of the core sheet segments 310B, 310C, 310D. With the use of riveting securement, the laminated bodies 310, 320, 330 each having a smooth outer peripheral surface can be fastened together with utmost ease.
Additionally, since the core sheet segments 310B, 310C, 310D circumferentially arranged end to end are identical in configuration, it is possible to reduce the number of components of the stator core 31 and increase the productivity of the stator core 31.
The invention should by no means be limited to the foregoing embodiment but may be practiced or embodied in other ways without departing from the sprit or essential character thereof. For instance, while in the embodiment shown in Figs. 1-5, three laminated bodies 310, 320 and 330 are stacked together to form a stator core 31, the number of laminated bodies to be stacked together may be any plural number other than three. For example, in a modification shown in Fig. 7, two laminated bodies 310 and 320 are employed to form a stator core 31. Similarly, in another modification shown in Fig. 8, five laminated bodies 310, 320, 330, 340 and 350 are stacked together to form a stator core 31.
Furthermore, the number of laminated bodies 310, 320, 330 should not always be the same as the number of core sheet segments 310B, 310C, 310D jointly forming individual core sheets 310A of each of the laminated bodies. For instance, as a modification of the stator core 31 shown in Figs. 2 and 3, two out of the three laminated bodies 310, 320 and 330 may be used to form a modified stator core. In this instance, each laminated body is still formed by a combination of three core sheet segments 310B, 310C and 310D. The number of core sheets 3lOA contained in each individual laminated body 310, 320, 330 may be different from that of the core sheets 310A contained in another laminated body.

While in the embodiments described above, the laminated bodies are joined or fastened together by means of the rivets 340, other joining means such as weld connection effected at the respective outer peripheral surfaces of the laminated bodies may be employed to secure the laminated bodies.
In the embodiment shown in Figs. 1-5 three laminated bodies 310, 320 and 330 are stacked and joined together to form a stator core 31. It is possible according to the invention to further provide an unsegmented core sheet placed on an outer surface of each of the two endmost laminated bodies located on opposite axial ends of the stator core 31. Fig. 9 shows in side view a stator core provided with such unsegmented core sheet. The stator core 31 shown in Fig. 9 differs from the stator core 31 of Fig. 2 in that an unsegmented core sheet 350 is provided on an axial end face of the laminated body 310 and another unsegmented core sheet 352 is provided on an axial end face of the laminated body 330. The unsegmented core sheets 350, 352 has a continuous ring-like configuration corresponding in shape to a ring-like configuration formed by the three core sheet segments 310B, 310C, 310D circumferentially connected together end to end. The unsegmented core sheets 350, 352 may be provided additional to the structure shown in Fig. 2. As an alternative, the unsegmented core sheets 350, 352 may be provided in place of at least a single layer of core sheet segments 310B, 310C, 310D circumferentially arranged end to end in each of the laminated bodies 310, 330. Each of the unsegmented core sheets 350, 352 may be formed from either a single steel plate or a plurality of steel plates laminated together.
Fig. 10 is an enlarged view showing a part of the stator core 31 of Fig. 9 as the stator core 31 is in an assembled condition relative to the front-side frame 4. As shown in this figure, a part of the axial end face of the stator core 31 is fastened to the support portion 420 of the front-side frame 4 by means of

the bolt 34. In this instance, (a head of) the bolt 34 abuts on the axial end face of the stator core 31 at a position which is coincident with a separating position (mating surface 310E) between two adjacent ones of the core sheet segments 310B, 310C, 310D forming the laminated bodies 310, 330 of the stator core 31. Accordingly, if a slight step or level difference is present at the separating position (mating surface 310E), there is a risk that the clamp load on the bolt 34 is transmitted unevenly to the two adjacent core sheet segments. To avoid (or alleviate) the uneven clamp-load transmission problem, the unsegmented core sheets 350, 352 of continuous ring-like configuration are provided. In the embodiment described above with reference to Figs. 9 and 10, two unsegmented core sheets 350 and 352 are provided on opposite axial ends of the stator core 31. It is possible, according to the present invention, to add only one unsegmented core sheet 350 placed on that side (rear side) of the stator core 31, which is held in abutment with the head of the bolt 34.


We claim:
1. A stator for a vehicular rotating electrical machine, comprising^
a cylindricallyshaped stator core (31) formed by a plurality of laminated bodies (310, 320, 330) stacked and secured together in an axial direction of the cylindricallyshaped stator core; and
a stator winding (32) wound on slots (311) of the stator core,
wherein each of the plurality of laminated bodies is formed by a plurality of core sheets (310A) laminated together,
wherein each of the core sheets is formed by a plurality of core sheet segments (310B, 310C, 310D) separated along a circumferential direction of the core sheet, and
wherein for every one of the laminated bodies, separating positions (310E) arranged along the circumferential direction of the plurality of core sheet segments of one of the core sheets and separating positions arranged along the circumferential direction of the plurality of core sheet segments of the adjacent core sheet are aligned with each other in the axial direction of the stator core.
2. The stator according to claim 1, wherein the separating positions (301E)
arranged along the circumferential direction of the core sheet segments (310B,
310C, 310D) in one laminated body (310) are offset in the circumferential
direction from the separating positions (310E) of the core sheet segments in the
adjacent laminated body (320), and wherein the core sheet segments in said one
laminated body and the core sheet segments in the adjacent laminated body are
circumferentially offset from each other and connected together when the
plurality of laminated bodies are joined together.

3. The stator according to claim 1 or 2, wherein each of the laminated bodies (310, 320, 330) has an outer peripheral surface (310F) of smooth cylindrical shape which is free from irregularities at mating surfaces (310E) of the plurality of core sheet segments (310B, 310C, 310D).
4. The stator according to claim 3, wherein each of the core sheet segments (310B, 310C, 310D) has a plurality of rivet holes (312) for insertion therethrough of a corresponding number of rivets (340), and the plurality of laminated bodies (310, 320, 330) are joined together by the rivets inserted through the respective rivet holes.
5. A stator for a vehicular rotating electrical machine, comprising:
a cylindricallyshaped stator core (31) formed by a number of core sheets (310A) laminated together in an axial direction of the cylindricallyshaped stator core; and
a stator winding (32) wound on slots (311) of the stator core,
wherein each of the plurality core sheets is formed by a plurality of core sheet segments (310B, 310C, 310D) separated along a circumferential direction of the core sheet, and
wherein the plurality of core sheet segments have separating positions (310E) arranged along the circumferential direction thereof, the separating positions being set to shift in the circumferential direction of the core sheet segments for every plural pieces of adjacent core sheets of the laminated core sheets.
6. The stator according to any one of the preceding claims 1-5, wherein the

core sheet segments (310B, 3IOC, 310D) separated in the circumferential direction thereof are identical in configuration.
7. The stator according to any one of the preceding claims 1-6, wherein the stator core (31) includes an unsegmented core sheet (350, 352) having a continuous ring-like configuration corresponding in shape to a ring-like configuration formed by the plurality of core sheet segments (310B, 310C, 310D) circumferentially connected end to end, the unsegmented core sheet being placed on the plurality of core sheet segments at one or both of opposite axial end faces of the stator core.


Documents:

2414-CHE-2007 AMENDED CLAIMS 01-08-2011.pdf

2414-CHE-2007 EXAMINATION REPORT REPLY RECEIVED 01-08-2011.pdf

2414-CHE-2007 POWER OF ATTORNEY.pdf

2414-che-2007 claims.pdf

2414-che-2007 correspondence others.pdf

2414-che-2007 description (complete).pdf

2414-che-2007 drawings.pdf

2414-che-2007 form-1.pdf

2414-che-2007 form-18.pdf

2414-che-2007 form-26.pdf

2414-che-2007 form-3.pdf

2414-che-2007 form-5.pdf


Patent Number 249094
Indian Patent Application Number 2414/CHE/2007
PG Journal Number 40/2011
Publication Date 07-Oct-2011
Grant Date 29-Sep-2011
Date of Filing 24-Oct-2007
Name of Patentee DENSO CORPORATION
Applicant Address 1-1, SHOWA-CHO, KARIYA-CITY, AICHI-PREF. 448-8661, JAPAN
Inventors:
# Inventor's Name Inventor's Address
1 SHARMA, RAVINDER C/O DENSO INDIA LTD., NOIDA-DADRI ROAD, TEHSIL-DADRI, GAUTAM BUDDHA NAGAR, P.O TILPATTA 203207, U.P.,
2 NAKANO, KAZUTOSHI C/O DENSO CORPORATION, 1-1, SHOWA-CHO, KARIYA-CITY AICHI-PREF. 448-8661
3 SACHDEVA, SURESH, KUMAR C/O DENSO INDIA LTD., NOIDA-DADRI ROAD, TEHSIL-DADRI, GAUTAM BUDDHA NAGAR, P.O TILPATTA 203207, U.P.,
PCT International Classification Number H 02K1/00
PCT International Application Number N/A
PCT International Filing date
PCT Conventions:
# PCT Application Number Date of Convention Priority Country
1 2006-288223 2006-10-24 Japan