JPH1169681A - Rotor for salient pole type dynamo-electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the difference of temperature rises by the site of a field coil, and to miniaturize a rotor and lengthen a lifetime by setting the length of a coil lifting plate in approximately the length of the inside of the field coil and forming a ventilating hole communicating a ventilating flue and the opposed section of the field coil to the coil lifting plate. SOLUTION: A coil lifting plate 8A is manufactured of a glass-reinforced polyester material, and has approximately the same length as a rectilinear section in the longitudinal direction of a field coil 5, and one coil lifting plate 8A is used between the adjacent field coils 5. A plurality of ventilating holes are formed among each coil bracket 9 and on the outsides of the coil brackets 9 on both sides in the coil lifting plates 8A. The temperatures of the central sections of the field coils 5 having an influence on a rating and a lifetime in the dynamo-electric machine can be lowered by maximizing the quantity of cooling air flowed out from the ventilating holes on both sides of the coil brackets 9 mounted at the central sections of each field coil 5. Accordingly, the dynamo-electric machine can be miniaturized and its lifetime is lengthened.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a rotor of a salient-pole rotating electric machine.

[0002]

2. Description of the Related Art FIG. 5 is a partial front view showing an example of a rotor of a conventional salient pole type rotary electric machine, and FIG. 6 is an enlarged detail view in a longitudinal section of FIG. 5 and 6, a rotor 1 whose both ends are supported by a stator frame shown by a chain line in FIG.
The cooling fan 13 is symmetrically press-fitted on both axial sides of a four-pole field iron core 4 protruding from the outer periphery of the rotor shaft 2.

A magnetic pole 3 is fixed to an outer peripheral surface of each field iron core 4 with a bolt (not shown), and a field coil 5 is inserted into each field iron core 4. An upper insulating collar 6 is inserted between each field coil 5 and the magnetic pole 3, and a lower insulating collar 12 is attached to the axial side of each field coil 5.

A V-shaped coil bracket insulating plate 10 is provided adjacent to each field coil 5, and a coil bracket 9 having a triangular cross section is provided inside the coil bracket insulating plate 10 in FIG. Are provided at three places.

In a ventilation path 16 formed by the adjacent lower insulating collar 12 and the rotor shaft 2, three coil push-up plates 8B made of mild steel and six compression coil springs 7 are inserted. The compression coil spring 7, the coil push-up plate 8B, the coil bracket 9 and the coil bracket insulating plate 10 are fixed to the rotor shaft 2 with bolts 11 inserted through them, and as a result, each field coil 5 It is pressed by the magnetic core 4 and maintains its shape against the centrifugal force caused by the rotation of the rotor.

[0006] In the rotor of the salient-pole type rotating electric machine configured as described above, the cooling fan 13 rotating with the rotor shaft 2 causes the air inside the stator frame to move as shown by the right and left arrows in FIG. Part flows to the stator side (not shown) through the space between the adjacent field coils 5, and the other part
It flows through 16 and also flows to the stator side.

By the way, in the rotor of the salient-pole type rotating electric machine configured as described above, increasing the cooling effect of the field coil is an essential requirement in order to increase the rating of the rotating electric machine and extend the life. On the other hand, users have also requested that the outer shape be reduced and installation costs including transportation be reduced.

[0008]

However, in the salient pole type rotating electric machine constructed as described above, both ends in the axial direction of the field coil 5 and both ends of the magnetic pole are thick arrows as shown by arrows in FIG. Is cooled by a high-speed and large amount of cooling air, so that the temperature rise value is relatively low. In particular, the central portion of the field coil 5 is cooled by a small amount of low-speed cooling air indicated by a thin arrow. The temperature rise value is higher than at both ends.

In the field coil 5 impregnated with the epoxy resin, deterioration of the insulating layer in the central portion is accelerated as compared with both sides, so that the temperature rise in the central portion is caused by an increase in rating and a long life. This is an obstacle to achieving the goal.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a salient pole type rotary electric machine rotor which can reduce the difference in temperature rise depending on the location of a field coil, and can reduce the size and extend the service life.

[0011]

According to a first aspect of the present invention, a plurality of coil brackets are attached to an opposing portion of a field coil inserted into a field core, and a plurality of coil brackets are provided between the field coil and a rotor shaft. The coil push-up plate is inserted into the ventilation path formed in
A coil spring that presses the coil push-up plate against the field coil is inserted between the coil push-up plate and the rotor shaft, and bolts that press the coil bracket against the field coil penetrate the coil bracket, the coil push-up plate, and the coil spring. In the rotor of the salient pole type rotating electric machine, the length of the coil push-up plate is set to be approximately the inside length of the field coil, and a through hole communicating between the ventilation path and the facing portion of the field coil is formed in the coil push-up plate It is characterized by having done.

According to a second aspect of the present invention, a plurality of coil brackets are attached to an opposing portion of a field coil inserted into a field core, and are formed between the field coil and a rotor shaft. In the rotor of the salient pole type rotary electric machine, in which a coil push-up tool is inserted into the ventilation path and a bolt for pressing the coil bracket against the field coil is inserted through the coil bracket and the coil push-up tool, the coil push-up tool is a leaf spring. It is characterized by the following.

In the rotor of the salient-pole type rotating electric machine according to the invention, the leaf spring has a C-shaped cross section in which both sides on the opening side contact the field coil. The rotor of the salient pole type rotary electric machine of the invention corresponding to Item 4 is characterized in that a resin film having a low friction coefficient is formed on a contact surface of a coil push-up plate or a leaf spring with a field coil, and in particular,
The rotor of the salient pole type rotating electric machine according to the invention according to claim 5 is:
The resin film is made of a fluororesin, a Teflon resin, a Vesvel resin, a polyimide resin, or a combination thereof.

According to the first aspect of the present invention, the number of components can be reduced by such means.
The temperature rise is suppressed by increasing the flow rate of the cooling air, particularly in the central portion of the field coil.

In the invention corresponding to claims 2 and 3, the number of components is reduced, the resistance of the ventilation path is reduced, and the flow rate of the cooling air in the central portion of the field coil is increased. Suppress the rise.

Further, in the inventions corresponding to the fourth and fifth aspects, the stress of the insulator on the contact surface with the coil push-up plate or the leaf spring, which is generated by expansion and contraction due to energization and stoppage of the field coil, is suppressed.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the rotor of a salient pole type rotating electric machine according to the present invention will be described below with reference to the drawings. FIG.
FIG. 1 is a view showing a first embodiment of a rotor of a salient pole type rotary electric machine according to the present invention, which corresponds to FIG. 6 shown in the prior art and corresponds to claim 1. FIG. 2 is a partial front view of the rotor of the salient-pole type rotating electric machine according to the present invention, and corresponds to FIG. 5 shown in the related art.

FIGS. 1 and 2 differ from FIGS. 5 and 6 shown in the prior art in the method of supporting the field coil, and the lower insulating collar 12 shown in FIGS. 5 and 6 is omitted. I have.

Further, the coil push-up plate 8A is made of a glass-reinforced polyester material, and has substantially the same length as a linear portion of the field coil 5 in the longitudinal direction, and has the same length as the adjacent field coil 5A.
Between the two.

A plurality of ventilation holes are formed in the coil push-up plate 8A between the coil brackets 9 and outside the coil brackets 9 on both sides as shown in FIG. 2, three ventilation holes are continuously formed on both sides of the center coil bracket 9, and the outer three ventilation holes are widely spaced. Outside the coil brackets 9 on both sides, two ventilation holes are formed at wide intervals.

In the salient pole type rotating electric machine constructed as described above, as shown by arrows A1 to A3 in FIG. 2, the field core of the rotor shaft 2 is driven by the cooling fan shown in FIG. Part of the cooling air blown in the axial direction between the field coils 5 adjacent to the respective magnetic poles from both sides of the magnetic pole 4 first passes through ventilation holes formed inside the coil brackets 9 on both sides as indicated by an arrow A1. And radially flows out in the direction of the stator through the adjacent field coils 5.

Similarly, a thick arrow A is drawn from the ventilation hole on the inside.
2 and a large amount of cooling air flows out from ventilation holes formed on both sides of the center coil bracket 9 as shown by a thicker arrow A3.

Therefore, in the rotor of the salient-pole type rotating electric machine configured as described above, the amount of cooling air flowing out from both sides of the coil bracket 9 provided at the center of each field coil 5 is maximized. Therefore, the temperature of the central portion of the field coil, which affects the rating and the life of the rotating electric machine, can be lowered, so that obstacles to downsizing and extending the life of the rotating electric machine can be solved.

Next, FIG. 3 is an enlarged longitudinal sectional view showing a second embodiment of the rotor of the salient pole type rotating electric machine according to the present invention, which is shown in FIG. 6 and the first embodiment shown in the prior art. It is a figure corresponding to the shown FIG. 1 and corresponding to claim 2 and claim 3.

FIG. 3 is different from FIG. 6 shown in the prior art in that the coil push-up plate 8B and the compression coil spring 7 shown in FIG. 6 are omitted, and only a leaf spring 14 having a C-shaped cross section is incorporated. The rest is the same as FIG.

That is, in the rotor shown in FIG. 3, the lower insulating collar 12 shown in FIG.
However, the coil push-up plate 8B and the compression coil spring 7 are omitted.

[0027] In the rotor of the salient pole type rotating electric machine configured as described above, the parts that cross the ventilation path are hexagon bolts.
Since only 11 is provided, the resistance of the ventilation path can be reduced, so that the amount of cooling air flowing out between the field coils from the ventilation path can be increased, and as a result, the temperature rise of each field coil can be further suppressed. It is possible to eliminate obstacles to downsizing and long life.

Next, FIG. 4 is an enlarged longitudinal sectional view showing a third embodiment of a salient pole type rotary electric machine according to the present invention, and corresponds to FIG. 1 shown in the first embodiment. FIG. 4 is a diagram corresponding to FIG.

FIG. 4 differs from FIG. 1 of the above-described embodiment in that a film 15 made of a fluororesin is formed on the contact surface of the coil push-up plate 8 with the field coil 5. Same as 1.

In the rotor of the salient-pole type rotating electric machine configured as described above, the electric field is generated between the coil and the coil push-up plate 8 by the expansion and contraction of the field coil 5 due to the energization and stoppage of the field coil 5. Since the friction can be reduced and the stress caused by the friction can be reduced, the deterioration of the insulating layer on the outer peripheral portion of the field coil 5 can be suppressed, and the size and the life can be further reduced. it can.

Instead of the fluororesin, a Teflon resin, a Vesvel resin or a polyimide resin may be employed. This coating is formed on the contact surface of the leaf spring 14 with the field coil employed in the second embodiment. May also be applied.

[0032]

According to the invention corresponding to the first aspect,
A plurality of coil brackets are attached to the opposing portion of the field coil inserted into the field core, and a coil push-up plate is inserted into a ventilation path formed between the field coil and the rotor shaft. A coil spring that presses the coil push-up plate against the field coil is inserted between the coil shaft and the rotor shaft, and a bolt that presses the coil bracket against the field coil is inserted through the coil bracket and the coil push-up plate and the coil spring. In the rotor of the rotary electric machine, the length of the coil push-up plate is substantially the inside length of the field coil, and a through-hole communicating between the ventilation path and the facing portion of the field coil is formed in the coil push-up plate. As the number of components has been reduced and the temperature rise in the field coil, especially in the center, has been suppressed,
It is possible to obtain a rotor of a salient pole type rotating electric machine that can reduce the difference in temperature rise depending on the location of the field coil, and can reduce the size and extend the life.

Further, according to the invention corresponding to claim 2,
A plurality of coil brackets are attached to the opposing portion of the field coil inserted into the field core, and a coil push-up tool is inserted into a ventilation path formed between the field coil and the rotor shaft. In the rotor of the salient pole type rotating electric machine in which the bolts pressing the magnetic coils are inserted through the coil bracket and the coil push-up device, the coil push-up device is a leaf spring to reduce the number of components and reduce the number of components of the ventilation path. Since the resistance has been reduced to suppress the temperature rise in the high-temperature portion of the field coil, the difference in temperature rise due to the location of the field coil has been reduced, and the rotor of a salient-pole type rotating electric machine has been reduced in size and has a longer life. Can be obtained.

According to the invention corresponding to claim 3, the leaf spring has a C-shaped cross section in which both sides on the opening side contact the field coil, thereby reducing the number of components and
A salient-pole rotating electric machine that reduces the temperature rise in the high-temperature portion of the field coil by reducing the resistance of the ventilation path, thereby reducing the difference in temperature rise due to the location of the field coil, miniaturizing and extending the life. Rotor can be obtained.

Further, according to the invention corresponding to claim 4,
By forming a resin film with a low coefficient of friction on the contact surface of the coil push-up plate or leaf spring with the field coil, the contact between the coil push-up plate and the leaf spring generated by expansion and contraction due to energization and stoppage of the field coil. Since the stress of the insulator on the surface has been suppressed, it is possible to obtain a rotor of a salient pole type rotating electric machine that can reduce the stress of the coil holding portion due to the normal stop of the field coil and can achieve a small size and a long life. it can.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a first embodiment of a rotor of a salient pole type rotating electric machine according to the present invention, which is cut in a direction orthogonal to an axis.

FIG. 2 is a cross-sectional view showing the first embodiment of the rotor of the salient pole type rotating electric machine according to the present invention, which is cut in a direction parallel to an axis.

FIG. 3 is a cross-sectional view showing a second embodiment of the rotor of the salient pole type rotary electric machine according to the present invention, which is cut in a direction orthogonal to an axis.

FIG. 4 is a cross-sectional view showing a third embodiment of the rotor of the salient pole type rotating electric machine according to the present invention, which is cut in a direction orthogonal to an axis.

FIG. 5 is a cross-sectional view showing an example of rotation of a conventional salient pole type rotary electric machine, cut in parallel to an axis.

FIG. 6 is a cross-sectional view showing an example of a rotor of a conventional salient pole type rotary electric machine, cut along a direction orthogonal to an axis.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Rotor, 2 ... Rotor shaft, 3 ... Magnetic pole, 4 ... Field iron core,
5: Field coil, 6: Upper insulating collar, 7: Compression coil spring, 8A: Coil pushing plate, 9: Coil bracket, 10: Coil bracket insulating plate, 11: Hexagon bolt, 12
... lower insulating collar, 13 ... cooling fan.

Claims (5)

[Claims] 1. A plurality of coil brackets are attached to an opposing portion of a field coil inserted into a field iron core, and a coil push-up plate is inserted into a ventilation path formed between the field coil and a rotor shaft. A coil spring for pressing the coil push-up plate against the field coil is inserted between the coil push-up plate and the rotor shaft, and a bolt for pressing the coil bracket against the field coil is provided between the coil bracket and the rotor. In the rotor of the salient-pole type rotating electric machine inserted through the coil push-up plate and the coil spring, the length of the coil push-up plate is substantially the inside length of the field coil, and the length of the ventilation passage and the field coil is A rotor for a salient pole type rotary electric machine, wherein a through hole communicating between opposed portions is formed in the coil push-up plate. 2. A plurality of coil brackets are attached to an opposing portion of a field coil inserted into a field core, and a coil pusher is inserted into an air passage formed between the field coil and a rotor shaft. In the rotor of the salient pole type rotary electric machine, wherein a bolt for pressing the coil bracket against the field coil is inserted through the coil bracket and the coil push-up tool, the coil push-up tool is a leaf spring. Rotor of a salient pole type rotating electric machine. 3. The rotor of a salient pole type rotary electric machine according to claim 2, wherein the leaf spring has a C-shaped cross section in which both sides on the opening side contact the field coil. 4. A resin coating having a low coefficient of friction is formed on a contact surface of the coil push-up plate or the leaf spring with the field coil. Rotor of salient pole type rotary electric machine. 5. The rotor for a salient-pole type rotating electric machine according to claim 4, wherein a material of the resin film is a fluororesin, a Teflon resin, a Vesvel resin, a polyimide resin, or a combination thereof.