JP2535895Y2 - Cooling structure of bipolar salient rotor - Google Patents

Description

[Detailed description of the invention]

[0001]

The present invention relates to a bipolar salient pole in which the winding of a two-pole salient pole type field rotor can be automatically wound and the inner peripheral surface of the field winding can be efficiently cooled. TECHNICAL FIELD The present invention relates to a cooling structure for a rotor.

[0002]

2. Description of the Related Art In general, a winding method of a field winding of a rotating field synchronous generator is such that a coil bobbin is provided on a field iron core, or the field iron core is insulated, and the winding is wound directly on the field iron core. Is adopted. However, in the conventional method, both the heating of the field winding itself due to the exciting current and the temperature rise of the field iron core act to heat the entire rotor, and the rotor is heated above the limit temperature of the field winding. became. Such a heated rotor (field iron) needs to be cooled,
In particular, it is important to improve the cooling efficiency, various cooling structures conventionally in order to suppress the temperature rise have been proposed the rotor is cooled. For example, as a method of suppressing a temperature rise of a field winding in a generator, a technique for cooling a salient-pole rotor (Japanese Utility Model Laid-Open No. 63-66070) discloses a technique of forming a rectangular plate around which a field winding is wound. Through coil bobbins on both sides
The field winding is wound around
Of the square plate and split disk
A simple stack of several field iron core sheets of different shapes
The body is inverted and stacked adjacently to form a rotor.
It has been proposed to provide a cooling passage between the core surface of the trochanter and the inner peripheral surface of the coil bobbin to increase the cooling efficiency of the field winding.

[0003]

In the case of the invention Problems to be Solved] However the salient-pole rotor method, when instrumentation wound field windings,
It is necessary to attach a coil bobbin , and further, a holding member for fixing the coil bobbin is required. For this reason, the cooling passage on the inner peripheral surface of the field winding is cooled via an insulating material such as a coil bobbin, so that the cooling efficiency is very poor. In order to increase the cooling efficiency of the field winding, it was necessary to provide a separate cooling means.

On the other hand, in a generator having a small capacity of 10 kW or less, a two-pole rotating field type AC generator having a high rotation speed is widely used in terms of cooling and miniaturization. For this reason, a rotor having a slot structure of the field iron plate is suitable.However, if the field iron plate has a slot structure, the field winding is sealed in the iron plate, so that the cooling efficiency is very poor. Therefore, the excitation current was designed to be low in order to suppress the temperature rise of the field winding. However, to keep the excitation current low, the number of turns of the demarcation field winding increases, so the cross-sectional area of the slot must be increased, and the magnetic path area of the field iron plate decreases in proportion to this. ,
If the magnetic path area is to be maintained, the size of the generator itself will be increased. For this reason, it is difficult to adopt the slot structure of the small rotating field type AC generator from the viewpoint of cooling.

[0005] In particular, in a welding generator driven by an engine intended for welding in the field, the welding voltage is low, but the welding current is mainly in the range of 120 to 300 A, and the capacity is large. Although they are small generators of 3.0 to 10 kW, they have a large output current, so that a rotating field generator is currently desired. In addition, due to the miniaturization and cooling efficiency, the engine of the engine generator is used at a high speed of 3000/3600 rpm, and it has a structure that can be used as a power source for lighting and power tools at the same time as welding work. In many cases, a two-pole rotating field generator was used.

This invention aims at improving the cooling efficiency, which is a drawback of the above-mentioned small-sized generator, and has a cooling structure capable of sending cooling air to the inner peripheral surface of a slot-type field winding. An object of the present invention is to provide a bipolar salient pole type rotor used in a pole rotating field type AC generator. This invention has a sufficient cooling effect even in a slot type two pole salient pole type rotor, and has a direct field winding without a bobbin or the like.
An object of the present invention is to provide a cooling structure for a bipolar salient rotor that cools a wire .

[0007]

SUMMARY OF THE INVENTION The object of the present invention is to:
A two-pole salient-pole rotor iron plate is stacked at a predetermined thickness to form one block, and the stacked blocks of the two-pole salient-pole rotor are alternately turned upside down to arrange a plurality of blocks to form a rotating shaft. in was formed by fixing bipolar salient rotating field type alternator, slot portions wound around the field winding of the two-pole salient rotor iron plate up or down the shaft center point symmetrical position
Part 3, 3 ', the vertically adjacent to the slot portion U-shaped openings 4, 4' to form a pole arc side edges of the <br/> slot portion of the two-pole salient rotor iron plate Distance between 3a and axis center line MN
Is formed shorter than the distance h between the pole arc side edge 4a of the U-shaped opening and the axis center line MN, so that the center angle (α) of the center line OP perpendicular to the axis of the bipolar salient pole type rotor is formed. , shaft together constitute a beta) asymmetrically, to longer than the distance d between the distance c between the bottom edge of the slot portion to the center line OP to the bottom edge and the center line OP of the U-shaped opening disposed in slot portion position of the boundary 5 of the boundary between the slot section and the U-shaped opening sorted by orthogonal center lines are spaced from the axis center line MN, slots in the laminated block This can be achieved by a configuration in which a cooling passage is formed between the inner peripheral surface of the field winding wound around the portion and the inner edge of the U-shaped opening and at the boundary portion of the U-shaped opening. In particular, a plurality of cooling passages groove provided on the bottom edge of the slot portion of the two-pole salient-pole rotor iron plate, wherein a distance x from the center line OP of the axis perpendicular to the bottom edge of the cooling passage groove The iron plate of a two-pole salient-pole type rotor in which the distance y to the bottom edge of the U-shaped opening is formed uniformly is stacked as one block, and this is alternately turned upside down for each block. This task can be achieved.

[0008]

[Action] bipolar salient pole rotor of the invention is, on one side of the center line OP of the axis perpendicular bipolar salient form field magnetic iron plate, slot portion and U-shaped opening in which the field winding is wound a Department Yes formed vertically through the boundary portion, the pole arc side edges of the U-shaped opening distance g between the pole arc part side edge 3a and the axial center line MN of the slot portion 4
a and the center angle (α, β) of the center line of the two-pole salient pole type rotor is asymmetric, so that several field iron plates are formed. blocks stacked vertically inverted every block alternately slot unit, the field winding is arranged in a state in which U-shaped openings are adjacent is supported by Ro <br/> Tsu isolation portion, of the field iron plate Slot at pole head
A cooling passage is formed between the inner peripheral surface of the field winding and the edge of the field iron plate and on the boundary side of the U-shaped opening along with the difference in the size of the opening width between the G-shaped opening and the U-shaped opening. in the gap of the U-shaped opening during operation of the generator and the cooling passages results in which a cooling fluid passes through Te (FIG. 2K path), the slot portion inside of the field winding of the two-pole salient-pole rotor The cooling effect is excellent, and the cooling efficiency can be sufficiently improved as a whole even if it has a closed structure.

Furthermore, slot unit, since the U-shaped opening field winding are arranged in a state adjacent is supported fitted in the slot unit, without requiring a coil bobbin, slot
The opening edge of the portion protrudes to form a locking portion, and the field winding can be stably held on the rotor without requiring a specific pressing member. The present invention will be described below based on a specific embodiment shown in the drawings, but the present invention is not limited to this.

[0010]

FIG. 1 is a plan view of a first embodiment of a laminated field iron plate used in the rotor of the present invention, and FIG.
FIG. 3 is a plan view in which a field winding at a central portion in which a plurality of field iron plates are stacked upside down and turned upside down is wound, and FIG.
D arrow view of FIG. 2 bipolar salient rotor for each block formed by laminating a field iron plate comprising upside down constitute adjacent embodiment, slots in FIG. 4 (A) 3 a-a line cross-sectional view of the parts, (B) is B - B line sectional view of the U-shaped opening in Figure 3,
FIG. 5 is a plan view of a second embodiment of a field iron plate used in the invented two-pole salient-pole rotor, and FIGS. 6A and 6B are cross-sectional views of the second embodiment as in FIG. FIG. 7 shows the second embodiment of the present invention.
It is the figure which wound the field winding of the example.

[0011] pole of thin steel sheet 1 is field iron plate bipolar salient constituting the bipolar salient-pole rotor, the slot portion 3 of the slot structure for interior holds the field coil 2 Figure 1 formed on the right side, and a center line perpendicular to the axis of the pole portion of the slot portion 3
A U-shaped opening 4 having an opening larger than the opening width of the slot 3 is formed in the symmetrical portion of the OP.
Distance d from the bottom edge to the center line is formed to be shorter Ri by a distance c to the center line from the bottom edge of the slot portion 3. The slot 3 and the U-shaped opening 4
A boundary portion 5 is formed therebetween . This boundary 5 is located at the axis center line MN.
It is located on the slot 3 side with a greater distance. The slot portion 3 'at the position corresponding to the other pole arc part of the symmetrical positions around the shaft hole 6 of the slot 3, also the U-shaped opening 4 and at symmetrical positions of the axial center U-shaped opening 4 '
Are formed above and below point symmetry .

[0012] The longer construction than the arc b of toward the center line OP child-shaped opening 4 an arc a of toward the slot portion 3 from the center line OP of the pole arc part of the thin steel 1 1
Above, the right half and the left half of the center line OP are formed with different lengths of the magnetic pole heads. By doing so,
Between the pole arc side edge 3a of the lots 3 and 3 'and the shaft center line MN.
The distance g is set in front of the arc-shaped side edge 4a on the U-shaped openings 4, 4 'side.
It is formed shorter than the distance h from the axis center line MN. The top and bottom of the opening edge of the <br/> slot portion 3 is formed a protruding portion 7, 7 '. Protruding part 7 of the pole center of shaft center and slot part 3
Linear central angle α of connecting the door is made larger than the center angle β connecting the pole head opening edge and the axial center of the U-shaped opening 4. 1
0 is wound in the slots 3, 3 'arranged vertically above and below the point symmetry.
Between the inner peripheral surface of the mounted field winding 2 and the U-shaped openings 4, 4 '.
A cooling passage 11 formed between the rim and the rim is a cooling groove.
Reference numeral 12 denotes insulating paper that wraps the field winding 2.

A plurality of the thin steel sheets 1 shown in FIG. 1 thus constructed are stacked and formed into a block state as shown in FIG. 3 to form a first block 9, and similarly, a second block 9 '. the third block 9 "to form a ..., stacked inverted vertically for each block, a plurality of blocks by bundling one constituting the rotor. the first block as shown in FIG. 3 9 an upper U-shaped opening 4 within the slot portion 3 of the upper slot structure of the second block 9 ', likewise the third block, the winding instrumentation in the space portion of the alternating and fourth block field winding 2 wound of The field winding 2 is supported by the boundary portion 5, and a gap is formed vertically in the U-shaped opening 4. This configuration causes a flow of cooling air as shown in FIG. (K path shown) The upper and lower protruding portions 7, 7 'are bounded by the slot portion 3. Slot 3 Chi was wound winding 2
It is configured to hold a wedge 8 for fixing the coil therein . Te first block 9 smell 3, a field winding which is housed in a U-shaped opening 4 be fixed to the coil end portion in the rotation shaft (not shown) field winding 2 is neither the insulating paper, housed in a naked state, therefore, as in FIG. 4 (B), the field inner peripheral surface of the coil 2 is U-shaped opening 4 of the spatial field winding by a cooling air K state installed in section 2 Ru <br/> be completely cool the periphery of the like.

[0014] While other cooling efficiency of slot portion 3 housed is wound field 2 bad, because in the second block 9 'is accommodated in a U-shaped opening 4, the cooling in comparison with the conventional efficiency Has improved. Since the slots 3 and the U-shaped openings 4 are alternately formed by the structure of the third block 9 ″, the field winding 2 is formed at the opening edge of the slots 3 and 3 ′.
Fully secured in the slots by wedges 8 fitted to the projecting portion 7, 7 '(see FIG. 4 (A) see), and the cooling efficiency in operation are very good. In the bipolar salient-pole rotor according to the second embodiment of the present invention shown in FIG. 5, cooling grooves 11, 11 are formed at both bottom corners of the slot portion 3 of the thin steel sheet 1, and the cooling grooves 11, distance from the opening 4 to the axis-perpendicular centerline are uniformly formed. Assuming that the respective distances are x and y, x = y is formed. The cooling groove 11 and the field winding 2
6, a spacer 13 is interposed as shown in FIG.

Next, a description will be given of the operation of the generator equipped with the two-pole salient pole type rotor according to the present invention. In the first embodiment, as shown in FIG. ′ Are alternately arranged up and down for each block, and U-shaped openings 4 and 4 are formed to form a bipolar salient-pole rotor, which is used to rotate the bipolar salient-pole rotor during operation. Accordingly, cooling air K enters from the central portions of the U-shaped openings 4 and 4 ′, and a cooling passage 10 is formed between the inner peripheral surface of the field winding 2 and the thin steel plate 1, and the U-shaped openings are formed. 4 flows in the direction of the arrow in FIG. 4B and is discharged through the periphery of the field winding 2 so that the field winding 2 is cooled. Air also flows outside the field winding 2 and is also cooled from the surface, so that the two-pole salient-pole rotor in the generator is not heated. The desired effect was obtained.

Further, according to the bipolar salient pole type rotor in which the blocks 9, 9 '... When the rotor type generator is operated, the U-shaped opening 4 is the same as in the previous embodiment.
The cooling between the inner peripheral surface of the field winding 2 and the thin steel plate 1
The passage 10 is formed and the cooling air entering from the edge of the U-shaped opening 4 passes through the cooling groove 11 of the slot 3. A center line OP perpendicular to the axis from the cooling groove 11 and the bottom edge of the U-shaped opening 4
Since the distances (x, y) are equal to each other, the sectional views of the slot 3 and the U-shaped opening 4 are as shown in FIGS. 6A and 6B. some than 4, and passes through the bottom of the field winding 2 cooling grooves 11, next to
It flows toward the U-shaped opening 4 of the block, flows in the direction of the arrow (see FIG. 7), and a cooling effect higher than that of the first embodiment is obtained.

[0017]

As described above, the two-pole salient pole type rotor according to the present invention is formed by fitting the field winding in the slot structure , so that the field winding does not move during operation. Is held. Moreover, it can be cooled directly without using a coil bobbin, etc.
Since the opening width of the U-shaped opening is formed larger than the opening width of the slot, a sufficient cooling effect can be obtained,
Cooling efficiency was further improved by providing a cooling groove in the slot portion.

[Brief description of the drawings]

FIG. 1 is a plan view of a first embodiment of a field iron plate used in the invented two-pole salient pole type rotor.

FIG. 2 is a plan view showing a central portion of a field winding in which a plurality of the field iron plates of FIG.

FIG. 3 is a view of the invented two-pole salient-pole rotor taken along the arrow D in FIG. 2;

[4] (A) is a A-A line cross-sectional view of the slot portion in FIG. FIG. 4B is a sectional view taken along line BB of the U-shaped opening in FIG. 3.

FIG. 5 is a plan view of a second embodiment of a field iron plate used for the rotor of the present invention;

FIG. 6A is a sectional view of the bipolar salient pole type rotor according to the second embodiment of the present invention, taken along the line AA in FIG. 4A. FIG. 4B shows a two-pole salient pole type rotor according to the second embodiment of the present invention.
It is the same BB sectional drawing as (B).

FIG. 7 is a view showing a second embodiment of the present invention in which a field winding is wound;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Sheet steel plate 2 ... Field winding 3,3 '... Slot part 4,4' ... U-shaped opening 5 ... Boundary part 6 ... Shaft hole 7,7 ... Protrusion part 8 ... Wedge 9 ... First block 10 ... Cooling passage 11 ... Cooling groove 13 ... Spacer

Claims (2)

(57) [Scope of request for utility model registration] 1. A two-pole salient-pole rotor iron plate is stacked with a predetermined thickness to form one block, and a plurality of blocks are arranged by alternately inverting the stacked blocks of the two-pole salient-pole rotor. In the two-pole salient-pole type rotating field type AC generator formed by fixing to the rotating shaft, the part around which the field winding of the two-pole salient-pole rotor iron plate is wound slot portions 3, 3 in the top and bottom ', this slot
The vertically adjacent to isolation portion to form a U-shaped opening 4, 4 ', the distance g between the pole arc part side edge 3a and the axial center line MN of slot portions of the two-pole salient rotor iron plate The center angle OP of the center line OP (α, α) perpendicular to the axis of the bipolar salient pole type rotor is formed by making the distance h between the pole arc side edge 4a of the U-shaped opening and the axis center line MN shorter. constitutes a beta) asymmetrically, the distance d between the distance c between the bottom edge of the <br/> slot portion to the center line OP to the bottom edge and the center line OP of the U-shaped opening
Slots are spaced position of the boundary portion 5 at the boundary between the slot portion sorted by the axis perpendicular centerline and U-shaped openings from the axial center line MN with a longer form
Arranged section side, cooling the boundary portion between and U-shaped opening between the inner edge of the inner peripheral surface and the U-shaped opening of the field winding wound around the slot portion <br/> in the laminated block A cooling structure for a bipolar salient-pole rotor, wherein a cooling passage is formed. Wherein a plurality of cooling passages groove provided on the bottom edge of the slot portion of the two-pole salient-pole rotor iron plate, perpendicular to the axis center line OP
The distance x to the bottom edge of the cooling passage groove and the distance y to the bottom edge of the U-shaped opening are made equal to each other. Cooling structure.