JPH0993847A - Rotor for salient pole type electric rotating machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a rotor in which the capacity can be increased while preventing the service life of insulation layer from shortening by eliminating uneven cooling temperature of field winding. SOLUTION: Ventilation grooves 5 are made in the outer circumferential surface of a rotor shaft 3 facing a field winding 1 and an air flow regulation spacer 6 is provided on the outer circumferential surface of ventilation groove 5. The air flow regulation spacer 6 is provided, at the intermediate part thereof, with a vent communicating from the lower surface to the side surface. Cooling air is fed from the opposite sides of ventilation groove 5 and passed through the vent made through the flow regulation spacer 6 to the side face in the center of field winding 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotor of a salient pole type rotating electric machine.

[0002]

2. Description of the Related Art FIG. 8 is a partial cross-sectional view showing a rotor of a conventional salient-pole type rotary electric machine and a part of a stator incorporating the rotor. In FIG. 8, in a side view (not shown), a stator core 13 stacked via a spacer is inserted into the inner periphery of a stator frame 12 arranged in parallel in a cylindrical shape.

An annular end plate 17 is superposed on the left and right ends of the stator core 13 and fastened with bolts (not shown). A stator core 13 is provided on the outer side of the end plate 17 with a stator frame 12
The iron core retainer 15 to be fixed to is fixed symmetrically.

The armature winding 7 is inserted into each slot formed on the inner peripheral side of the stator core 13. In the stator core 13, a cooling passage 14 for cooling air is radially formed by spacers that are stacked between the core punched plates.

A field core 2 is formed by stacking a core punching plate on a rotor shaft 3 inserted into the shaft center of a stator core 13 to form a cylindrical shape.
Has been press-fitted. Key-shaped iron core retainers 10 are also fixed to the left and right ends of the field iron core 2.

Insulating plates 11 are inserted in advance on the stator core side and the rotary shaft side of the magnetic poles of the iron core retainer 10 and the field iron core 2,
The field winding 1 is inserted between these insulating plates 11. These field windings 1 are prevented from being displaced by centrifugal force by a trapezoidal coil bracket (not shown) inserted between the field windings of the magnetic poles.

In the salient pole type rotating electric machine configured as described above, cooling air is sent from both sides of the field core 2 to the respective field cores by the inner fans (not shown) inserted on both sides of the rotor shaft 3. Be done.

This cooling air passes from the outer periphery of each field iron core 2 through a gap 18 formed between each field iron core 13 and each stator iron core 13,
Passing through the cooling air passage 14 formed in each stator core 13,
It flows out between the stator frames 12 and is again sucked by the inner fan to make a circulation.

[0009]

However, in the rotor of the salient pole type rotary electric machine configured as described above, both ends of the field winding 1 in the axial direction are cooled by the cooling air blown from the left and right inner fans. Although it is cooled, the axial central portion of the field winding 1 is cooled by the cooling air whose temperature has risen on both sides as well as the flow velocity of the cooling air being lower than that on both sides. Becomes higher.

Particularly, since the above-mentioned coil brackets are inserted between the field windings 1, the central portion in the axial direction of each field winding 1 is cooled by being shielded by the coil brackets on both sides. Not enough air flow.

Therefore, in the rotor of the salient pole type rotary electric machine constructed as described above, the current-carrying capacity of the field winding 1 and the life of the insulating material are the portions where the temperature rise in the central portion in the axial direction is the highest. Since it is determined by, it becomes an obstacle in increasing the capacity of the rotating electric machine.

Therefore, an object of the present invention is to eliminate the uneven cooling temperature of the field winding, prevent the life of the insulating layer from being shortened, and increase the capacity of the salient pole type rotating electric machine rotor. Is to get.

[0013]

According to a first aspect of the present invention, there is provided a salient-pole rotating electric machine rotor, wherein a coil bracket is inserted between field windings wound around a field pole iron core. In a rotor of a salient pole type rotating electric machine in which cooling air is blown from both sides of the shaft between the field windings, an axial ventilation groove is formed on the outer circumference of the rotor shaft facing the field windings. An air volume adjusting spacer is inserted between the outer peripheral side of the ventilation groove and the field winding.

Further, the rotor of the salient pole type rotating electric machine according to the second aspect of the present invention is characterized in that the air volume adjusting spacer is formed with a ventilation hole communicating between the ventilation groove and the field winding. And

Further, in the rotor of the salient pole type rotating electric machine according to the third aspect of the present invention, two air amount adjusting spacers are stacked, each air amount adjusting spacer is formed, and the vertically adjacent vent holes are communicated with each other. Is characterized by.

Further, the rotor of the salient pole type rotating electric machine according to a fourth aspect of the present invention is characterized in that a holding plate for preventing axial movement of the air volume adjusting spacer is fixed to the rotor shaft.

The rotor of the salient pole type rotating electric machine according to the fifth aspect of the present invention is characterized in that the air volume adjusting spacer has a tapered key shape.

Further, the rotor of the salient pole type rotary electric machine according to the invention of claim 6 is characterized in that an inner fan is provided outside the field pole iron core of the rotor shaft.

By such means, the central portion of the field winding, which has a high temperature downstream of the cooling air, is cooled by the cooling air supplied from the ventilation groove through the air volume adjusting spacer.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a rotor of a salient pole type rotary electric machine of the present invention will be described below with reference to the drawings. FIG.
[FIG. 8] is a partial perspective view showing a first embodiment of the present invention, and is a view corresponding to FIG. 8 shown in a conventional extraction operation and corresponding to claims 1 and 2. 2 is a cross-sectional view of FIG. 1 and is a cross-sectional view of the left end of the coil bracket 4.

1 and 2, a difference from FIG. 8 is that a pair of ventilation holes 5 and an air volume adjusting spacer 6 are provided between each field winding 1 and the rotor shaft 3. Other than that, it is the same as FIG. Therefore, the same parts as those in FIG. 8 are designated by the same reference numerals and the description thereof will be omitted.

In FIGS. 1 and 2, on the outer circumference of the rotor shaft 3, there is a ventilation groove 5 having a U-shaped cross section which is parallel to the axial center line with respect to a portion opposed to both sides of the lower insulating collar 8 in the circumferential direction. Has been formed.

On the outer peripheral surface on the opening side of these ventilation grooves 5,
A slight flat surface is formed, and between the flat surface and the lower surface of the lower insulating collar 8, a prismatic air volume adjusting spacer 6 made of a glass reinforced polyester material is press-fitted in the axial direction.

FIG. 3 is an enlarged detailed perspective view showing the air volume adjusting spacer 6. Note that FIG. 3 shows the air volume adjusting spacer 6 incorporated on the right side of each magnetic pole in FIG. 1, and the air volume adjusting spacer 6 is incorporated on the left side of each magnetic pole with the right and left reversed. Openings are formed in the lower surface and the right side surface of the air volume adjusting spacer 6 on both sides of the intermediate portion.
A substantially L-shaped ventilation hole 6a is provided.

In the rotor of the salient pole type rotating electric machine constructed as described above, the cooling air which has entered from both sides of the ventilation groove 5 by the inner fan by the rotation of the rotor shaft 3 as shown by an arrow A1 in FIG. The air is discharged from the lower part of the ventilation hole 6a formed in the air volume adjusting spacer 6 to the opening 6a1 formed in the side surface of the adjusting spacer 6.

As shown by the arrow A2 in FIG. 2, this cooling air rises between the coil brackets 4 on the side surface of the field winding 1, passes through the air gap 18 shown in FIG. It flows into the cooling passage.

Therefore, in the rotor of the salient pole type rotary electric machine constructed as described above, since the cooling air can be introduced between the coil brackets 4 on both sides, the field winding 2
The temperature rise in the central part of can be reduced. Therefore, it is possible to increase the current carrying capacity and the capacity of the rotating electric machine. Further, since the material of the air volume adjusting spacer 6 is made of glass reinforced polyester material, the lower insulating spacer 8 can be omitted and used instead.

Next, FIG. 4 is a view showing a second embodiment of the rotor of the salient pole type rotary electric machine of the present invention, and is a partial sectional view corresponding to FIG. 2 and corresponding to claim 3. In FIG. 4, unlike FIG. 1 and FIG. 2, two air volume adjusting spacers are stacked, and the air volume of the cooling air can be adjusted depending on the position between them.

Of these, in the lower air volume adjusting spacer 6A, the openings 6a1 of the ventilation holes 6a formed in the air volume adjusting spacer 6 shown in FIG. 3 reach both upper and lower surfaces of the air volume adjusting spacer 6A.

Similarly, the upper air volume adjusting spacer 6B is also
The openings reach both upper and lower sides, of which the opening of the lower air volume adjusting spacer 6A is displaced to the right from the central position of the coil bracket 4, and the opening of the upper air volume adjusting spacer 6B is It is offset to the left.

In the rotor of the salient pole type rotary electric machine constructed as described above, in the type test after assembly, when the temperature rise in the central portion of the field winding 1 exceeds the design value, the By shifting the positions of the air volume adjusting spacers 6A and 6B and aligning the positions of the openings, it is possible to increase the flow rate of the cooling air indicated by the arrows A1 and A2 to cope with the situation.

Next, FIG. 5 is a partial perspective view showing a third embodiment of the rotor of the salient pole type rotating electric machine of the present invention, and FIG. 6 is a right side view of FIG. FIG. 5 is a diagram corresponding to FIG.

In FIG. 5, in order to prevent axial movement of the air volume adjusting spacer 6 incorporated in the rotor shown in FIGS. 1 and 2, both sides of the air volume adjusting spacer 6 are substantially T-shaped. Is attached to the rotor shaft 3 and is fixed to the stepped portion of the rotor shaft 3 with three bolts 16.

In this case, even if the tightening in the thickness direction is loose in order to facilitate the adjustment of the air volume adjusting spacers 6A, 6B shown in FIG.
There is an advantage that the movement of 6B can be prevented. The holding plate 9 is used as the air volume adjusting spacer 6 shown in FIGS.
It may be adopted for both sides of.

Further, FIG. 7 is a partial side view showing a fourth embodiment of the rotor of the salient pole type rotary electric machine of the present invention.
FIG. 7 is a diagram corresponding to FIG. 4 and FIG. 6 and corresponding to claim 5.
In FIG. 7, the air volume adjusting spacers 6C and 6D are inclined in opposite directions in the axial direction and have a shape like a taper key. The ventilation holes are the same as those in FIG. 4, but are omitted.

In the rotor of the salient pole type rotating electric machine having the air volume adjusting spacers as described above, the air volume adjusting spacers 6C and 6D are driven in the axial direction from the thicker ends to form the lower insulating collar. It can be driven firmly into the rotor shaft.

[0037]

As described above, according to the first aspect of the present invention,
In the rotor of a salient-pole rotary electric machine, in which a coil bracket is inserted between the field windings wound around the field magnetic pole iron core and cooling air is blown between the field windings from both sides of the rotor shaft, By forming a ventilation groove in the axial direction on the outer periphery of the rotor shaft facing the magnetic winding, and by inserting an air volume adjusting spacer between the outer peripheral side of the ventilation groove and the field winding, Since the central part of the field winding, which has a high temperature downstream of the cooling air, is cooled by the cooling air supplied from the ventilation groove through the air volume adjusting spacer, the unevenness of the cooling temperature of the field winding is eliminated and the insulating layer is removed. It is possible to obtain a rotor of a salient-pole rotating electric machine that can prevent the decrease in the life of the rotor and increase the capacity.

According to the second aspect of the present invention, the ventilation hole communicating between the ventilation groove and the field winding is formed in the air volume adjusting spacer, so that a high temperature is provided downstream of the cooling air. Since the central part of the field winding is cooled by the cooling air supplied from the ventilation groove through the air volume adjusting spacer, the unevenness of the cooling temperature of the field winding is eliminated, and the life of the insulating layer is prevented from being shortened. It is possible to obtain the rotor of the salient pole type rotating electric machine capable of increasing the capacity.

Further, according to the third aspect of the invention, by stacking two air volume adjusting spacers and connecting the ventilation holes formed in each air volume adjusting spacer and vertically adjacent to each other, the cooling air is provided downstream of the cooling air. Since the central part of the field winding which becomes high temperature is cooled by the cooling air supplied from the ventilation groove through the air volume adjusting spacer, the unevenness of the cooling temperature of the field winding is eliminated,
It is possible to obtain a rotor of a salient-pole type rotary electric machine that can prevent the life of the insulating layer from decreasing and increase the capacity.

Further, according to the invention described in claim 4, by fixing the holding plate for preventing axial movement of the air flow adjusting spacer to the rotor shaft, the field winding which becomes high temperature downstream of the cooling air. Since the central part of the wire is cooled by the cooling air supplied from the ventilation groove through the air volume adjusting spacer, the unevenness of the cooling temperature of the field winding is eliminated, and the reduction of the life of the insulating layer is prevented,
It is possible to obtain the rotor of the salient pole type rotating electric machine capable of increasing the capacity.

According to the fifth aspect of the present invention, the air volume adjusting spacer is formed in a taper key shape so that the air volume adjusting spacer is provided from the ventilation groove to the central portion of the field winding which becomes high temperature downstream of the cooling air. Since it is cooled by the cooling air supplied through the rotor, the rotor of salient pole type electric machine can eliminate the uneven cooling temperature of the field winding, prevent the life of the insulating layer from decreasing, and increase the capacity. Can be obtained.

Further, according to the invention of claim 6,
By providing an inner fan on the outside of the field pole core of the rotor shaft, the central portion of the field winding, which becomes hot downstream of the cooling air, is cooled by the cooling air supplied from the ventilation groove through the air volume adjusting spacer. Since it has been cooled, it is possible to obtain a rotor for a salient-pole type rotating electric machine that can eliminate the uneven cooling temperature of the field winding, prevent the life of the insulating layer from decreasing, and increase the capacity.

[Brief description of drawings]

FIG. 1 is a partial perspective view showing a first embodiment of a rotor of a salient pole type rotary electric machine of the present invention.

FIG. 2 is a partial cross-sectional view showing the first embodiment of the rotor of the salient pole type rotating electric machine of the present invention.

FIG. 3 is a partially enlarged detailed perspective view of FIGS. 1 and 2.

FIG. 4 is a partial cross-sectional view showing a second embodiment of the rotor of the salient pole type rotating electric machine of the present invention.

FIG. 5 is a partial perspective view showing a third embodiment of the rotor of the salient pole type rotating electric machine of the present invention.

FIG. 6 is a right side view of FIG.

FIG. 7 is a partial side view showing a fourth embodiment of the rotor of the salient pole type rotating electric machine of the present invention.

FIG. 8 is a partial cross-sectional view showing an example of a rotor of a conventional salient-pole rotary electric machine.

[Explanation of symbols]

1 ... Field winding, 2 ... Field magnetic pole iron core, 3 ... Rotor shaft, 4 ...
Coil bracket, 5 ... Ventilation groove, 6, 6A, 6B, 6
C, 6D ... Air volume adjusting spacer, 7 ... Upper insulating collar, 8
… Lower insulating collar, 9… Presser plate, 10… Iron core presser.

Claims (6)

[Claims] 1. A salient-pole rotating electric machine in which a coil bracket is inserted between field windings wound around a field pole iron core and cooling air is blown from both sides of a rotor shaft between the field windings. In the rotor, an axial ventilation groove is formed with respect to the outer circumference of the rotor shaft facing the field winding, and an air flow rate is provided between the outer circumferential side of the ventilation groove and the field winding. A rotor for a salient pole type rotating electric machine, characterized in that an adjusting spacer is inserted. 2. The rotation of the salient pole type rotating electric machine according to claim 1, wherein a ventilation hole is formed in the air volume adjusting spacer so as to communicate with the field winding from the ventilation groove. Child. 3. A stack of the air flow rate adjusting spacers,
The rotor of a salient pole type rotating electric machine according to claim 2, wherein the air holes that are formed in each of the air flow rate adjusting spacers and are vertically adjacent to each other communicate with each other. 4. The salient pole type rotating electric machine according to claim 1, wherein a holding plate for preventing axial movement of the air volume adjusting spacer is fixed to the rotor shaft. Rotor. 5. The rotor of a salient pole type rotating electric machine according to claim 3, wherein the air volume adjusting spacer has a tapered key shape. 6. The rotation of a salient pole type rotating electric machine according to claim 1, wherein an inner fan is provided outside the field pole core of the rotor shaft. Child.