JP3033580U - Two pole salient rotor - Google Patents

Abstract

(57) [Abstract] (Correction) [Problem] It is possible to reliably fix a field winding wound around a field iron core. SOLUTION: A distance g between a pole arc portion side edge 3a of a slot portion of a two-pole salient pole type rotor iron plate and a shaft center line MN is set to a pole arc portion side edge 4a of a U-shaped opening and the shaft center line MN. Is shorter than the distance h of the center line O of the bottom edge 4b of the U-shaped opening.
The distance d to P, the bottom edge 3b of the slot portion and the distance c to the center line OP are formed to be equal to each other, and the boundary portion between the slot portion and the U-shaped opening distributed by the center line OP perpendicular to the axis is formed. 5 is the axis center line MN
The two U-shaped salient rotor iron plates are stacked by arranging the U-shaped opening at a slot side with a larger space to make the opening of the U-shaped opening larger than the slot, and projecting the upper and lower opening edges of the slot inward. Thus, when the field winding is wound around the slot, the outer peripheral surface of the field winding is in close contact with each slot and a cooling passage is formed between the slot and the upper and lower peripheral surfaces.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a two-pole salient-pole type rotor in which windings of a two-pole salient-pole type field rotor can be automatically wound and the field winding can be securely held.

[0002]

[Prior art]

 Generally, the winding method of the field winding of the rotary field synchronous generator is to install a coil bobbin on the field core or to insulate the field core and wind the field core by winding the winding. Has been adopted. However, in the conventional method, both the heat generation 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 temperature exceeds the limit temperature of the field winding. became. It is necessary to cool the rotor (field iron core) whose temperature has risen in this way, and in particular, it is important to improve the cooling efficiency. In order to cool this rotor and suppress the temperature rise, various conventional methods have been used. A cooling structure was proposed.

For example, as a method of suppressing a temperature rise of a field winding in a generator, a technique of a cooling structure for a salient pole type rotor disclosed in Japanese Utility Model Application Laid-Open No. 4-97447 previously proposed by the applicant. A slot and a U-shaped opening are formed on both sides of a rectangular plate that is distributed by the center line of the axis of rotation of the field iron core of the two-pole salient pole rotor that winds the field winding. The distance between the line and the bottom edge of the slot is longer than the distance to the bottom edge of the U-shaped opening on the opposite side, and the left and right widths of the polar arc (outer circumference, slot edge and U-shaped opening edge) The field cores are laminated to form a laminated block, the laminated block adjacent to this laminated block is inverted and overlapped, and the field winding is wound in the slot section. It has a two-pole salient-pole rotor with a U-shaped opening. In this section, a gap is formed between the field winding and the field iron core, and a cooling passage is formed on the peripheral surface of the field winding.

[0004]

However, in the case of the salient pole type rotor, when the field winding is wound, one side portion distributed by the center line of the rotation axis of the field core is narrowly formed. Therefore, the width of the field core as a whole is small, the magnetic resistance of the field core is large, and accordingly the field current is also large, and heat is easily generated. In addition, the field winding and the bottom of the U-shaped opening are not in close contact with each other, so that the field winding becomes unstable, and there is a problem that the centrifugal force of the field winding causes deviation during high-speed rotation. Further, in the case of the two-pole salient pole type rotor formed by vertically reversing the laminated block described in Japanese Utility Model Laid-Open No. 4-97447, only the inside of the slot structure portion is wound when the field winding is wound. Since the insulating paper cannot be fitted to the bottom of the U-shaped opening in order to fit the insulating paper to form the cooling passage, the process of loading the insulating paper into each slot structure is complicated. (See FIG. 3A).

On the other hand, for a generator with a small capacity of 10 kW or less, a two-pole rotary field type AC generator that rotates at high speed is widely used in terms of cooling and downsizing, but this small generator has improved production efficiency. For this reason, a field iron plate of this rotor with a slot structure is suitable.However, if this field iron plate is made into a slot structure, the field winding is sealed in the iron plate, so cooling efficiency is extremely high. Therefore, the exciting current was designed to be low in order to suppress the temperature rise of the field winding. However, if the exciting current is kept low, the number of windings of the 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. However, if this magnetic path area is to be maintained, the generator itself will become larger. Therefore, it was difficult to adopt a small rotating field type AC generator with a slot structure because it had a problem in terms of cooling.

[0006] In particular, in a welding generator that uses an engine as a drive source for welding in the field, the welding voltage is low, but the welding current is mainly in the 120 to 300 A class, and the capacity is large. Although it is a small generator of 3.0 to 10 kW, the rotating field generator is desired because of its large output current. In addition, in view of such miniaturization and cooling efficiency, the engine of the engine generator has a high speed of 3000/360 0 rpm, and it can be used as a power source for lighting and power tools at the same time as welding work. For the structure, a two-pole rotating field generator was often used.

The present invention provides a two-pole salient-pole rotary field-type AC generator of a small size capable of firmly holding the field winding as well as the cooling efficiency, which is a drawback of the small-sized generator. A salient pole rotor is provided.

[0008]

[Means for Solving the Problems]

 The above-mentioned problem of this invention is to stack two pole salient pole type rotor iron plates with a predetermined thickness to form one laminated block. In a two-pole salient pole type rotating field type AC generator formed by arranging the laminated blocks of and fixing them to the rotating shaft, the portion of the two-pole salient pole type rotor iron plate where the field winding is wound is the shaft. It consists of upper and lower slot parts 3 and 3'at symmetric positions with respect to the center point and upper and lower U-shaped opening parts 4 and 4'adjacent to the slot parts. The polar arc of the slot part of the two-pole salient pole rotor iron plate The distance g between the side edge 3a and the axial center line MN is formed shorter than the distance h between the polar arc side edge 4a of the U-shaped opening and the axial center line MN, and the bottom edge 4b of the U-shaped opening is formed. Distance d to the center line OP, bottom edge 3b of the slot, and the center line OP The position of the boundary portion 5 of the boundary between the slot portion and the U-shaped opening portion, which is formed to be equal to the distance c and is divided by the center line OP perpendicular to the axis, is arranged on the slot side with a space from the axis center line MN. The U-shaped opening is made larger than the slot, and the upper and lower opening edges of the slot are projected inward to form a two-pole salient-pole rotor iron plate. When the rotor iron plates are stacked to a predetermined thickness to form a laminated block, and the laminated block is turned upside down and the field winding is wound around the slot, the outer peripheral surface of the field winding is in each slot. And the bottom surface of the U-shaped opening of the rotor iron plate, a cooling passage is formed between the upper and lower peripheral surfaces of the field winding in the U-shaped opening, and the opening edge of the slot is Due to the formed locking part, the field winding There can be achieved by the configuration being maintained.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION In the two-pole salient pole rotor of the present invention, a field winding is wound on one side of the two-pole salient pole field iron plate which is divided by a centerline OP perpendicular to the axis. A slot portion and a U-shaped opening are formed above and below the boundary portion, and the distance g between the side edge 3a of the polar arc portion of this slot portion and the axial center line MN is determined by the polar arc of the U-shaped opening portion. The side edge 4a and the axis center line MN are formed to be shorter than the distance h, and the laminated blocks in which several field iron plates are stacked are alternately turned upside down, and the slot and the U-shaped opening are adjacent to each other. The field windings are arranged and supported by the bottom edge 3b of the slot and the bottom edge 4b of the U-shaped opening to ensure that the field winding is stably held in the rotor during high speed rotation of the generator. Therefore, it is possible to prevent the displacement of the field winding due to the centrifugal force during the operation of the rotor. Furthermore, the cooling effect of the field winding inside the slot portion of the two-pole salient pole rotor is excellent, and a wedge can be fitted into the slot portion to form a close-closed structure and hold the field winding securely. .

Further, since the slot portion and the U-shaped opening portion are arranged adjacent to each other with the boundary portion interposed therebetween, the field winding is fitted and supported in the slot portion, so that the coil bobbin is not required and the slot portion is not required. The projecting edge of the opening constitutes a locking portion, and the field winding can be stably held on the rotor without requiring a specific pressing member. As described above, the bottom edge of the slot portion and the bottom edge of the U-shaped opening portion of the two-pole salient pole type rotor of the present invention are formed in the same plane, and since the cooling passage is not formed in the bottom portion, they are fitted in the slot portion. The insulating paper can be loaded with a continuous long insulating paper in one process as shown in FIG. 3B. A field winding is wound on this insulating paper. Further, since the distance from the axis of rotation OP to the slot and the bottom edge of the U-shaped opening on the opposite side is equal, the width of the field core can be increased, and the magnetic resistance of the field core can be reduced. Can be made smaller. Therefore, the field current can be made small and the temperature rise of the field winding can be suppressed, so that sufficient cooling can be performed without forming a cooling passage at the bottom of the field winding. . The present invention will be described below based on specific embodiments shown in the drawings, but the present invention is not limited to this.

[0011]

Embodiment FIG. 1 is a plan view of one embodiment of laminated field iron plates used in the present invention two-pole salient pole type rotor, and FIG. 2 is a block diagram in which several field iron plates of FIG. It is a top view which wound the field winding of the central part which was inverted and laminated | stacked. FIG. 3 is a comparative perspective view of the conventional device A and the device B showing the shape of the insulating paper fitted in the slot portion.

A slot portion 3 for internally holding a field winding 2 is formed at a right angle to the pole portion of a thin steel plate 1 which is a double pole salient pole type field iron plate constituting a two-pole salient pole rotor. 1 is divided by the center line OP, and a U-shaped opening 4 having an opening larger than the opening width of the slot 3 is formed on the left side. The distance d to the line is formed to be equal to the distance c from the bottom edge 3b of the slot portion 3 to the center line. A boundary portion 5 is provided between the upper and lower slot portions 3 and the U-shaped opening portion 4 which are distributed by the center line OP perpendicular to the axis of the pole portion. The boundary portion 5 is located on the slot portion 3 side with a distance from the axis center line MN. The slot portion 3'is provided at a position corresponding to the other polar arc portion of the slot portion 3 which is symmetrical with respect to the shaft hole 6, and the U-shaped opening is provided at a position symmetrical with the U-shaped opening 4 and the axial center. This is a structure in which the parts 4'are formed symmetrically above and below the point.

The pole arc portion of the thin steel plate 1 is formed such that the right and left halves of the center line OP in FIG. 1 have different magnetic pole head lengths. By doing so, the distance g between the polar arc portion side edge 3a of the slot portions 3 and 3'and the shaft center line MN is set so that the polar arc portion side edge 4a on the U-shaped openings 4 and 4'side and the shaft center line MN. It is formed to be shorter than the distance h from. Locking portions 7, 7, 7 ', 7'are formed above and below the opening edge of the slot portion 3, respectively. Wedges 10, 10 may be fitted and formed on the engaging portions 7, 7, 7 ', 7'. Reference numeral 8 is a continuous insulating paper fitted in the slot portion 3 and the bottom edge 4b of the U-shaped opening portion 4.

A plurality of the thin steel plates 1 shown in FIG. 1 configured as described above are stacked to form a block state as shown in FIG. 2 to form a first block 9, and similarly a second block 9 '. , A third block 9 ″ ... Is formed, and each block is inverted upside down and stacked to form a plurality of blocks into a rotor. As shown in FIG. 2, the first block is formed. The field winding 2 is wound by winding in the upper U-shaped opening 4 of 9 and the slot 3 of the upper side of the second block 9 ′, in the same manner as the space alternating with the third block and the fourth block. The field winding 2 is supported by the boundary portion 5, and a gap is formed vertically in the U-shaped opening portion 4.

The upper and lower engaging portions 7, 7, 7 ', 7'at the opening edges of the slot portions 3, 3'are wound with the field winding 2 around the slot portions 3, 3', and then the slot portion 3 is formed. , 3'to hold the wedges 10, 10 for fixing the coil. In the first block 9 of FIG. 2, if the coil end portion of the field winding 2 housed in the U-shaped opening 4 is fixed to the shaft hole 6 of the rotary shaft, the field winding 2 does not have insulating paper. , Paid naked. Since the slot portions 3 and the U-shaped openings 4 are alternately formed by the structure of the third block 9 ″ ..., the field winding 2 has the locking portions 7 at the opening edges of the slot portions 3 and 3 ′. , 7, 7 ', 7'fitted into the slots by wedges 10, 10.

Next, the operation of the generator in which the two-pole salient-pole rotor of the present invention is installed will be described. As shown in FIG. 2, the slot portions 3 and 3 ′ of the thin steel plate 1 are alternately arranged in each block. And the U-shaped openings 4 and 4'are formed in the slots 3 and 3 ', and the field winding 2 fitted in the slots 3 and 3'is securely held in the slots 3 and 3', and , The inner surface of the field winding 2 is in close contact with the bottom edges of the U-shaped openings 4 and 4'to form a two-pole salient pole rotor. It is possible to prevent the displacement of the field winding 2 due to the centrifugal force of the field winding 2 due to the rotation. Further, a vertical gap is formed between the U-shaped openings 4, 4 ′ and the field winding 2. Therefore, the dotted line portion Z in FIG. 2 serves as a continuous cooling passage, and the cold air of the cooling fan provided outside passes through to cool the field winding 2. On the other hand, air also flows to the outside of 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 and the desired effect is obtained.

[0017]

As described above, in the two-pole salient pole type rotor of the present invention, the field winding is fitted in the slot portion and is formed in contact with the bottom edge of the U-shaped opening 4. Therefore, it is possible to prevent the field winding from being displaced due to the centrifugal force of the field winding during the operation of the rotor, and the field winding is securely held without moving during operation. Also, since the width of the field iron core can be made large, the magnetic resistance of the field iron core can be reduced, so the field current can be reduced, the temperature rise of the field winding can be suppressed, and a ventilation path can be provided at the bottom of the slot. Even without it, the desired cooling can be secured. Moreover, since the field winding can be integrated and assembled, the field winding can be easily wound automatically.

[Brief description of the drawings]

FIG. 1 is a plan view of an embodiment of a field iron plate used in the two-pole salient pole rotor of the present invention.

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 comparative perspective view showing a shape of an insulating paper fitted in a slot portion of a conventional device A and a device B of the invention.

[Explanation of symbols]

 1 ... Thin steel plate 2 ... Field winding 3, 3 '... Slot part 4, 4' ... U-shaped opening 5 ... Boundary part 6 ... Shaft hole 7, 7 '... Locking part 8 ... Insulating paper 9 ... 1st Block 10 ... wedge

Claims (1)

[Utility model registration claims] 1. A two-pole salient-pole rotor iron plate is stacked in a predetermined thickness to form one laminated block, and the laminated blocks are alternately inverted upside down to arrange a plurality of laminated blocks and fixed to a rotary shaft. In the two-pole salient-pole type rotary field-type AC generator formed by the above, the portion of the two-pole salient-pole type rotor iron plate around which the field winding is wound is located above and below the slot portion 3 at the axial center point symmetrical position. 3'and upper and lower U-shaped openings 4 and 4'adjacent to the slot portion. The pole arc portion side edge 3a of the slot portion of the two-pole salient pole rotor iron plate and the shaft center line MN are formed. The distance g is formed shorter than the distance h between the polar arc side edge 4a of the U-shaped opening and the shaft center line MN, and the distance d between the bottom edge 4b of the U-shaped opening and the center line OP and the slot. Is formed to be equal to the distance c between the bottom edge 3b of the portion and the center line OP and The position of the boundary portion 5 at the boundary between the slot portion and the U-shaped opening distributed by the right-angled center line OP is arranged on the slot side with a space from the axis center line MN, and the opening of the U-shaped opening is slotted. And the upper and lower opening edges of the slot are projected inward to form a two-pole salient-pole rotor iron plate. The two-pole salient-pole rotor iron plates are stacked to a predetermined thickness. To form a laminated block, and when the laminated block is turned upside down and the field winding is wound around the slot portion, the outer peripheral surface of the field winding closely contacts each slot portion and the U-shaped opening of the rotor iron plate. A cooling passage is formed between the upper and lower peripheral surfaces of the field winding in the U-shaped opening, and the field winding is formed by the locking portion formed at the opening edge of the slot. Double pole salient type characterized by being retained Rotor.