JP5058097B2 - Rotating machine armature - Google Patents

Description

  The present invention relates to an armature of a rotating electrical machine, and more particularly to an armature of a rotating electrical machine having an armature core formed in a laminated body and an inner spacing piece for forming a ventilation duct in the armature core.

  A conventional armature of a rotating electric machine will be described with reference to FIGS.

  FIG. 10 is a longitudinal sectional view showing a main configuration of an armature of a conventional rotating electric machine, FIG. 11 is a partial transverse sectional view of the armature in FIG. 10, and FIG. 12 shows a part of a blank core of the armature in FIG. FIG. 13 is a partial perspective view, and FIG. 13 is a plan view showing the shape of one end plate of the punched-sheet iron core in FIG.

  As shown in FIG. 10, the armature of the rotating electrical machine includes a punched-sheet iron core 3 and a ventilation duct 2 that are arranged at intervals in the axial direction of the rotor (not shown). This punched-sheet iron core 3 is configured by stacking a predetermined number of punched plates 9 made of a substantially fan-shaped silicon steel plate in a ring shape in the circumferential direction of a rotating electrical machine and stacking a predetermined number in the axial direction of a rotor (not shown). .

  Teeth (tooth portions) 4 and slots 5 are formed on the punched iron core 3 so as to be alternately arranged in the circumferential direction along the inner circumference, and are divided into substantially fan shapes. As shown in FIG. 13, the division position is generally the slot 5 or the boundary between the slot 5 and the tooth 4. On the other hand, the ventilation duct 2 is configured by disposing an inner spacing piece 6 in a radial direction on an end plate 10 formed in the same shape as the punched plate with a predetermined interval between the stacking directions of the punched iron cores 3. The The inner spacing piece 6 is made of a steel material, and includes an inner spacing piece 6 a extending from the slot bottom 7 in the outer peripheral direction of the armature core 1 and an inner spacing piece 6 b extending from the tip of the tooth 4 in the outer peripheral direction of the armature core 1. Become.

  In this case, when the tightening force of the armature core 1 is reduced due to operation for many years, the inner spacing piece 6b is prevented from falling off due to the magnetic attractive force of the rotor or the magnetic vibration of the iron core. In general, the steel plate is made of the same silicon steel plate as that of the punching plate 9 or is attached to an end plate 10 having the same shape as that of the punching plate 9 by spot welding or the like.

  An armature winding 8 is inserted in the slot 5 of the punched core 3 of the armature core 1. The armature winding 8 is fixed in the slot 5 of the punched iron core 3 by a wedge 11. Normally, the armature winding 8 is composed of a lower armature winding 8a and an upper armature winding 8b.

  By the way, in the rotating electric machine, during operation, Joule heat based on electric resistance is generated particularly in the armature winding 8 of the armature core 1. In order to suppress this heat generation, the refrigerant is usually caused to flow from the rotor side of the rotating electrical machine in the radial direction of the ventilation duct 2, and the heat generated in the armature winding 8 and the adjacent punched iron core 3 is taken and cooled. I am doing so.

At this time, the refrigerant flows into the ventilation duct 2 from the teeth 4 close to the rotor (not shown), cools the punched iron core 3 composed of the armature winding 8 and the adjacent punched plate 9, and is divided by the inner spacing piece 6a. Then, it flows to the outer diameter side of the punched iron core of the ventilation duct 2 and flows out in the outer peripheral direction of the armature core 1. This refrigerant is guided from the outer diameter side of the armature core 1 to a cooler (not shown) outside the rotating electrical machine, where the heat-exchanged and cooled refrigerant is returned to the rotating electrical machine and circulates again for cooling.
Japanese Patent Publication No. 60-34339

  By the way, looking at the relationship of the magnetic flux during operation of the rotating electrical machine, the magnetic flux incident on the inner spacing piece 6b made of steel material from the rotor side moves in the radial direction of the punched iron core 3 along the inner spacing piece 6b. Then, it is incident in the axial direction of the punched-sheet iron core 3, and then changes its direction in the circumferential direction on the outer diameter side from the teeth 4, passes through the inside of the blanked-sheet core 3, and reaches the field magnetic pole side (not shown).

  However, in this configuration, when the magnetic flux passing through the inner spacing piece 6 b moves to the punched-sheet core 3 of the armature core 1, the magnetic flux enters a direction perpendicular to the stacking direction of the punched-sheet core 3, so Current is induced and loss (eddy current loss) is generated. In particular, a large eddy current flows through the end plate 10 to which the inner spacing piece 6b is attached, and the loss increases.

  Furthermore, this eddy current loss increases the magnetic resistance of the inner spacing piece 6b equivalently, and the magnetic flux of the inner spacing piece 6b decreases.

  As described above, in the conventional configuration described above, there is a problem that a local temperature rise occurs at a joint portion of the punched-sheet iron core 3 and the inner spacing piece 6b and the magnetic flux of the inner spacing piece 6b cannot be effectively used. It was.

  Therefore, as in Patent Document 1, the inner spacing piece is composed of a nonmagnetic hollow rod and a plurality of magnetic thin wires inserted into the hollow rod, and an armature is provided on the outer peripheral side of the inner spacing piece. By providing a magnetic path piece that magnetically connects the surface on the side opposite to the rotor of the iron core and the magnetic thin wire, the magnetic flux transfer from the inner spacing piece to the iron core is reduced.

  However, this method has a problem in that the structure of the inner spacing piece is complicated, the manufacturing efficiency is greatly reduced, and the manufacturing cost is increased as compared with the conventional method.

  Therefore, an object of the present invention is to provide an armature for a rotating electrical machine that can reduce eddy current loss caused by transfer of magnetic flux from an inner spacing piece to an iron core with a simple configuration.

  In order to achieve the above object, one aspect of the armature of a rotating electrical machine according to the present invention is made of a magnetic material, and a plurality of fan-shaped blanks formed by alternately arranging teeth and slots in the circumferential direction. Are formed in a stack in a circumferential direction so as to form radial ventilation ducts at predetermined intervals in the axial direction, and are disposed in slots of the punched plate core. Formed on the end plate, the armature winding, the end plate having teeth and slots formed so that the teeth and slots formed on the extraction plate are inserted into the end surface of the ventilation plate side of the extraction plate core. A plurality of inner spacing pieces made of magnetic material provided in the teeth so as to extend in the radial direction of the punched-sheet iron core and configured to circulate the refrigerant in the radial direction of the punched-sheet iron core in the ventilation duct. In the armature of the example it was rotating electrical machine, said end plate tooth gap portion is formed extending in the punching plate core radially of, characterized in that disposed inside distance piece so as to straddle the gap.

  Another aspect of the armature of the rotating electrical machine according to the present invention is a ring of a plurality of fan-shaped punching plates made of a magnetic material and formed by alternately arranging teeth and slots in the circumferential direction. A punched-sheet iron core that is laminated to form a radial ventilation duct at predetermined intervals in the axial direction, and an armature winding disposed in a slot of the punched-sheet core. An end plate in which teeth and slots are formed so that the teeth and slots formed in the extraction plate are inserted into the end surface of the extraction plate on the side of the ventilation duct, and the teeth formed in the end plate are extracted. A plurality of inner spacing pieces made of a magnetic material provided so as to extend in the radial direction of the sheet core and configured to circulate the refrigerant in the radial direction of the punched sheet core in the ventilation duct. In the child, the end plate is formed so that the teeth become a circumferential abutting portion of the adjacent end plates, and a gap portion is formed between the adjacent end plates at the abutting portion of the end plate. An inner spacing piece is disposed so as to straddle at least the gap portion formed in the tooth among the gap portions formed in the abutting portion of the end plate.

  According to the present invention, during the operation of the rotating electrical machine, the eddy current induced in the end plate when the magnetic flux passing through the inner spacing piece is transferred to the punched plate core, the flow path is divided by the gap portion. Eddy current loss can be reduced, and the device efficiency can be improved.

  Hereinafter, a first embodiment of an armature of a rotating electrical machine according to the present invention will be described with reference to the drawings.

[First Embodiment]
A first embodiment of the present invention will be described with reference to FIGS. Here, the same reference numerals are given to the parts common to the above-described conventional technology, and the duplicated explanation is omitted.

  FIG. 1 is a partial perspective view showing a part of a punched-sheet core in the armature of the rotary electric machine according to the first embodiment of the present invention, and FIG. 2 is a partial plan view showing a part of an end plate of the punched-sheet core in FIG. FIGS. 3A and 3B are views showing a state in which an inner spacing piece is attached to the end plate of the punched-sheet iron core of FIG. FIG. 4 is a partial cross-sectional view showing a state in which inner spacing pieces are arranged in the teeth of the end plate of the armature punched plate core of the rotating electric machine of the first embodiment, and FIG. 5 is the rotation of the first embodiment. It is a fragmentary sectional view which shows the state which joined the inner side space | interval piece in the circumferential direction butt | matching part of the end plate of the punched-plate iron core of an armature of an electric machine.

  In FIG. 1, a punched-sheet iron core 3 formed by laminating a substantially sector-shaped punched plate 9 butted in an annular shape with inner spacing pieces 6 arranged at predetermined intervals so that a ventilation duct is formed in the axial direction. An end plate 10 having the same shape as the punch plate 9 is disposed at the laminated end portion. Inner spacing pieces 6 a and 6 b made of a magnetic material are provided radially from the teeth 4 to the outer diameter side of the end plate 10 and from the slot bottom 7 to the outer peripheral side of the end plate 10 in the radial direction of the end plate 10. Is configured. The inner spacing pieces 6a and 6b are formed in a rectangular cross section, but the cross sectional shape is not limited, such as using I-shaped steel.

  The inner spacing pieces 6a and 6b are joined to the end plate 10 by a method such as spot welding. A slit (gap) 13 is formed in the tooth 4 of the end plate 10.

  As shown in FIG. 2, the length of the slit 13 is formed in the range of 2/3 to 1 with respect to the length of the teeth 4a. Further, as shown in FIG. 3, the inner spacing piece 6 provided in the tooth 4a straddles the inner spacing piece 6b provided across the butting portion 14 of the tooth 4b of the end plate 10 and the slit 13 provided in the tooth 4a. The inner spacing piece 6bs provided in this manner and the inner spacing piece 6a disposed from the vicinity of the slot bottom 7 to the outer diameter side of the end plate 10 are configured.

  FIG. 4 shows a cross-sectional view of the vicinity of the tooth 4a of the punched-sheet iron core 3 according to the first embodiment. A slit 13 is provided in the tooth 4a of the end plate 10 (10x, 10y), and the inner spacing piece 6bs. Shows a state of being installed so as to straddle the slit 13. For example, the inner spacing piece 6b is attached to the end plate 10x by a welded portion 15 by spot welding or the like. Usually, the end plate 10y provided opposite to the end plate 10x is not fixed and is not particularly welded. However, of course, spot welding may be performed on the end plate 10y side.

  As shown in FIGS. 2 and 3, in the present embodiment, the circumferential abutting portion 14 of the end plate 10 is provided not in the slot 5 but in the tooth 4 as in the conventional example shown in FIG. The inner spacing piece 6b is disposed so as to straddle the circumferential abutting portions 14 of the end plates 10x, 10y provided on the teeth 4.

  FIG. 5 is a cross-sectional view showing a joining state of the inner spacing piece 6b and the end plate in the vicinity of the circumferential abutting portion 14 of the teeth 4a of the end plates 10a, 10b, 10c, and 10d according to the first embodiment. The inner spacing piece 6b disposed so as to straddle the butting portion 14 is attached to the end plate 10a by a welded portion 15 by spot welding or the like. When the armature core 1 is assembled, the end plate 10b on the right side of the figure is placed first, and the end plate 10a is placed next to it. The end plates 10c and 10d provided to face the end plates 10a and 10b are not particularly welded. However, of course, the end plates 10c and 10d may be spot-welded.

  The present embodiment is configured as described above, and the vortex induced in the end plates 10a, 10b, 10c, and 10d when the magnetic flux passing through the inner spacing pieces 6b and 6bs shifts to the punched-plate core 3 during operation of the rotating electrical machine. Since the current is divided and suppressed by the slit 13, eddy current loss can be reduced.

  FIG. 9 shows an example of the radial distribution of eddy current density generated in the inner spacing piece 6bs made of a magnetic material calculated by three-dimensional magnetic field analysis in a 450 MVA class turbine generator.

  As can be seen from this graph, the eddy current density in the inner spacing piece 6bs becomes maximum at a position slightly inside from the tip of the tooth 4, and becomes smaller as it approaches the bottom of the slot. The amount of magnetic flux transferred from the inner spacing piece 6bs to the punched iron core 3 also varies depending on the eddy current density in FIG. 9, but from 67% to 100% of the radial position, that is, from 2/3 to 1/3 of the tooth length. In this range, the eddy current density is less than half of the peak value. If the length of the slit 13 provided in the end plate 10 is shorter, the rigidity of the iron core can be strengthened and the manufacturing cost can be suppressed. Therefore, considering the effective suppression of eddy current, the length of the slit is reduced. It can be said that the eddy current loss which generate | occur | produces in the end plate 10 can be effectively suppressed by setting it as the range of 2/3 to 1 of the teeth length.

  Further, since the circumferential abutting portion 14 of the end plate 10 is in the tooth 4b and the inner spacing piece 6b is disposed so as to straddle the abutting portion, the magnetic flux that has entered the inner spacing piece 6b is removed. Since the eddy current induced in the end plate 10 at the time of shifting to is suppressed by dividing the flow path by the circumferential butt portion 14 of the end plate 10, eddy current loss can be reduced.

  According to the present embodiment, it is possible to suppress an increase in eddy current loss induced in the end plate 10 when the magnetic flux is transferred from the inner spacing pieces 6b, 6bs to the punched plate core 3, thereby further improving the efficiency of the device. It becomes possible to improve.

[Second Embodiment]
Next, a second embodiment of the present invention will be described with reference to FIG.

  FIG. 6 is a diagram showing a partial configuration showing a state in which inner spacing pieces are arranged on the end plate of the punched-plate core of the armature of the rotating electrical machine according to the second embodiment. The same components as those in the first embodiment are denoted by the same reference numerals and description thereof is omitted. In FIG. 6, the inner spacing pieces 6a, 6b, 6bs are indicated by broken lines.

  In FIG. 6, the butting portion 14 of the end plate 10 extends from the inner diameter side of the tooth 4b to the outer diameter side. On the outer diameter side of the end plate 10 from the teeth 4b, the teeth 4b are inclined in the circumferential direction with respect to the abutting portions 14b of the teeth 4b from the positions of the abutting portions 14a corresponding to the circumferential positions substantially the same as the slot bottom portions 7. The abutting portion 14c is formed on the outer diameter side of the end plate, and the inner spacing piece 6b and the abutting portion 14c are shifted on the outer diameter side of the end plate 10.

  Due to such a structure, the inner spacing piece 6b has a large contact area with the end plate 10 on the outer diameter side of the end plate 10. Therefore, the tightening force of the armature core 1 is increased, and the reliability of the rotating electrical machine can be further improved.

  In addition, if the inclination angle on the outer diameter side of the end plate 10 of the butting portion 14c is shifted by 0.5 degrees or more with respect to the butting portion 14b in the tooth 4b, the inner spacing piece 6b on the outer diameter side from the tooth 4b. The end plate 10 can be pressed without contacting the butting portion 14c.

[Third Embodiment]
Next, a third embodiment of the present invention will be described with reference to the drawings.

  FIG. 7 is a partial configuration diagram showing a state in which inner spacing pieces are arranged on the end plate of the punched-plate core of the armature of the rotating electric machine according to the third embodiment of the present invention. The same components as those in the first and second embodiments are denoted by the same reference numerals and description thereof is omitted. In FIG. 7, the inner spacing pieces 6a, 6b, 6c, 6d are indicated by broken lines.

  In FIG. 7, the abutting portion 14 of the end plate 10 is formed in a straight line from the tip end portion of the tooth 4b to the outer diameter side end portion of the end plate 10, and the inner spacing piece 6c is outside the inner diameter side end portion of the tooth 4b. It is provided so as to straddle the gap of the abutting portion 14 up to the vicinity of the root portion of the tooth 4b along the radial side, and is formed with the inclination changed in the circumferential direction on the outer diameter side of the root portion of the tooth 4. On the outer diameter side, the inner spacing piece 6c and the butting portion 14 are shifted.

  With such a structure, the inner spacing piece 6c has a larger contact area with the end plate 10 on the outer diameter side of the end plate 10, so that the tightening force of the armature core 1 is increased and the rotating electric machine is reliable. Can be further enhanced.

  The inclination angle of the inner spacing piece 6c with respect to the abutting portion 14 on the outer diameter side of the end plate 10 is approximately half the length of the inner spacing piece 6c on the outer diameter side of the tooth 4b if it is approximately 0.5 degrees or more. However, the end plate 10 can be pressed without coming into contact with the abutting portion 14, and the clamping force of the armature core can be secured satisfactorily.

  In FIG. 7, the inner spacing pieces 6a and 6d that are not in contact with the abutting portion 14 are also changed in inclination from the radial direction to the circumferential direction on the outer diameter side. This is done to ensure the duct flow path. By doing so, the amount of refrigerant flowing through the ventilation duct of the armature core of the rotating electric machine can be secured satisfactorily, and the temperature of the armature winding and the armature core can be kept good.

[Fourth Embodiment]
Next, a fourth embodiment of the present invention will be described with reference to the drawings.

  FIG. 8: has shown the cross-sectional view which shows the joining condition of the inside space | interval piece and end plate in the circumferential direction butt | matching part vicinity of the end plate of the armature of the rotary electric machine which concerns on the 4th Embodiment of this invention. The same components as those in the first to third embodiments are denoted by the same reference numerals and description thereof is omitted.

  In FIG. 8, a filler 16 made of resin is injected into the slit 13 provided in the end plate 10 to increase the area of the punched iron core 3 that receives pressure from the inner spacing piece 6, and The end plates 10 on both sides are prevented from vibrating separately.

  Due to such a configuration, it is possible to suppress the reduction of the tightening force of the iron core by providing the slit 13, and the end plates 10 on both sides of the slit 13 vibrate due to long-time operation, thereby tightening the iron core. It can suppress that a sticking falls.

  In the present embodiment, the filler 16 injected into the slit 13 has been described. However, the filler 16 may be injected into the gap formed in the circumferential butt portion of the end plate 10.

  Further, the filler 16 has a magnetic material such as a magnetic material in the resin, such as a dust magnetic material, and has a high electrical resistance that can suppress the generation of eddy currents in the filler. preferable. Thereby, since it is suppressed that the magnetic resistance of the core iron core 3 with respect to the main magnetic flux decreases by the slit 13, an increase in the field current on the rotor side is prevented, the occurrence of field copper loss is suppressed, and a higher efficiency is achieved. It becomes possible to provide a simple rotating electric machine. In addition, when filling with the filler which has a magnetic characteristic, an electrical continuity arises by the filler 16 by performing an insulation process in the slit 13 surface of the end plate 10, and forming an insulating film. Can be suppressed.

  As described above, by filling the gap of the slit 13 with the filler 16, it is possible to suppress a decrease in the tightening force of the iron core in the slit 13 portion, and prevent an increase in the field current on the rotor side, Generation | occurrence | production of a field copper loss can be suppressed and a more efficient rotary electric machine can be provided.

  The filler 16 can be expected to be more effective by injecting the magnetic filler 16 not only into the slit 13 but also into the gap formed in the butt 14 of the end plate 10.

The partial perspective view which shows a part of punched-plate iron core in the armature of the rotary electric machine of 1st Embodiment which concerns on this invention. FIG. 2 is a partial plan view showing a part of an end plate of the punched iron core in FIG. 1. The figure which shows the state which attached the inner side spacing piece to the end plate of the punching-plate iron core of FIG. The fragmentary sectional view which shows the state which has arrange | positioned the inner side spacing piece in the tooth | gear of the end plate of the armature blank board core of the rotary electric machine of 1st Embodiment which concerns on this invention. The fragmentary sectional view which shows the state which joined the inner side space | interval piece in the circumferential direction butt | matching part of the end plate of the armature blank board core of the rotary electric machine of 1st Embodiment which concerns on this invention. The fragmentary top view which shows the end plate of the armature blank board core of the rotary electric machine of 2nd Embodiment which concerns on this invention. The fragmentary top view which shows the end plate of the armature blank board core of the rotary electric machine of 3rd Embodiment which concerns on this invention. The fragmentary sectional view which shows the state which joined the inner side spacing piece to the end plate of the punched-plate iron core of the armature of the rotary electric machine of the 4th and 5th embodiment which concerns on this invention. The graph which shows eddy current density distribution based on the numerical calculation from the tooth | tip tip part to the slot bottom part in the inner side spacing piece of the armature of the rotary electric machine of 1st Embodiment which concerns on this invention. The longitudinal cross-sectional view which shows the main structures of the armature of the conventional rotary electric machine. FIG. 11 is a partial cross-sectional view of the armature in FIG. 10. FIG. 11 is a partial perspective view showing a part of the armature blank plate core in FIG. 10. The top view which shows the shape of one end plate of the punched-plate iron core in FIG.

Explanation of symbols

1: Armature core 2: Ventilation duct 3: Die plate cores 4, 4 a, 4 b: Teeth 5, 5 a: Slots 6, 6 a, 6 b, 6 bs, 6 c, 6 d: Inner spacing piece 7: Slot bottom 8: Armature winding Line 9: Extraction plate 10, 10x, 10y, 10a, 10b, 10c, 10d: End plate 11: Wedge 12: Insulating layer 13: Slit (gap)
14: Butt part 15: Welded part 16: Filler

Claims (8)

A ventilation duct that is made of a magnetic material and has a plurality of fan-shaped punching plates formed by alternately arranging teeth and slots in the circumferential direction and annularly butted in the circumferential direction at a predetermined interval in the axial direction. A punched iron core that is laminated and formed to form
An armature winding disposed in the slot of the punched iron core;
An end plate having teeth and slots formed so that the teeth and slots formed in the punch plate are inserted in the end surface of the punch plate core on the side of the ventilation duct;
A plurality of inner spacing pieces made of a magnetic material provided on the teeth formed on the end plate so as to extend in the radial direction of the punched-sheet core and configured to circulate refrigerant in the radial direction of the punched-sheet core in the ventilation duct When,
In the armature of a rotating electric machine with
An armature for a rotating electric machine, wherein a gap portion extending in a radial direction of a punched-sheet iron core is formed in a tooth of the end plate, and an inner spacing piece is disposed so as to straddle the gap portion.   2. The armature for a rotating electrical machine according to claim 1, wherein the gap portion is formed within a range of 2/3 to 1 of a teeth length from a tip end portion on the inner diameter side of the end plate. A ventilation duct that is made of a magnetic material and has a plurality of fan-shaped punching plates formed by alternately arranging teeth and slots in the circumferential direction and annularly butted in the circumferential direction at a predetermined interval in the axial direction. A punched iron core that is laminated and formed to form
An armature winding disposed in the slot of the punched iron core;
An end plate having teeth and slots formed so that the teeth and slots formed in the punch plate are inserted in the end surface of the punch plate core on the side of the ventilation duct;
A plurality of inner spacing pieces made of a magnetic material provided on the teeth formed on the end plate so as to extend in the radial direction of the punched-sheet core and configured to circulate refrigerant in the radial direction of the punched-sheet core in the ventilation duct When,
In the armature of a rotating electric machine with
The end plate is formed so that the teeth become a circumferential butting portion of adjacent end plates, and is formed in an annular shape so that a gap portion is formed between the adjacent end plates at the butting portion of the end plate. An inner armature piece is disposed so as to straddle at least the gap portion formed in the tooth among the gap portions formed in the butted portion of the end plate.   4. The armature for a rotating electrical machine according to claim 3, wherein the abutting portion on the outer diameter side of the teeth of the end plate is formed to be inclined in a circumferential direction with respect to the abutting portion of the teeth.   The butted portion of the end plate is formed such that the circumferential inclination angle of the butted portion on the outer diameter side from the teeth of the end plate is 0.5 degrees or more with respect to the butted portion of the teeth. The armature of the rotary electric machine according to claim 4.   The inner spacing piece is disposed so as to cover the gap portion in the teeth of the end plate, and on the outer diameter side of the teeth, the inner spacing piece is at least 0.5 degrees circumferential with respect to the inner spacing piece disposed in the teeth. The armature for a rotating electric machine according to claim 3, wherein the armature is disposed so as to be tilted at an angle.   The armature for a rotating electrical machine according to any one of claims 1 to 6, wherein the gap portion is filled with a resin.   The armature for a rotating electrical machine according to any one of claims 1 to 7, wherein magnetic powder is mixed in the resin.

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