JPS642526Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a rotor of a rotating electrical machine such as a synchronous machine.

Hereinafter, a salient pole rotor of a rotating electrical machine such as a synchronous machine will be explained as an example.

A salient pole rotor of a conventional synchronous machine is shown in FIGS. 1 and 2 as a vertical sectional view and a partial plan sectional view. The figure shows the case of a vertical shaft type, where 1 is a rotating shaft, 2 is a rotor spider, and 3 is a rim that is firmly fixed to the rotor spider and forms a yoke for the rotor. Reference numeral 4 denotes a plurality of radial ventilation ducts provided on this rim, and ventilation intervals are formed by a plurality of duct pieces 5 and a spacing ring 6. 7 is a tightening bolt for the rim 3, and 8 is a nut. Reference numeral 10 denotes a plurality of salient pole-shaped magnetic pole cores made of laminated thin steel plates, which are tightened with tightening bolts.
is fixed to the outer periphery of the 11 is a field coil fitted into the magnetic pole core 10; 9 is a magnetic pole; the magnetic pole core 10
and a field coil 11. 12 is a fan attached to the rim 3.

Next, 13 is a stator frame, 14 is a stator core fixedly supported by this stator frame, and a radial ventilation duct 15 is provided. 16 is a stator coil, and 17 is an end enclosure. 18 is a rotor, 1
12, 19 is a stator, and 13 to 17 are arranged. 20 is a rotor 18 and a stator 19
This is the air gap formed between the

In addition, in the case of so-called internal cooling in which cooling air is also sent between the magnetic pole core 10 and the field coil 11, the configuration is as shown in the partial plan sectional view and longitudinal sectional view of FIGS. 3 and 4. Ta. In the figure, 21 is a top washer made of an insulating material, and 30 is a manifold provided in a portion of the rim 3 located between the spaced apart field coils 11 in order to reduce ventilation resistance when cooling air flows out from the ventilation duct 4. , 40
is an inter-pole ventilation path formed between adjacent magnetic poles 9,
Reference numeral 50 indicates an intra-magnetic pole ventilation passage provided between the magnetic pole iron core 10 and the field coil 11, and 60 indicates an exhaust passage provided at the portion of the head of the magnetic pole 9 that is in contact with the top washer 21; Cooling air flowing through the communicating intra-magnetic pole ventilation path 50 is made to flow out between the magnetic poles 9.

In the conventional device described above, when the rotor 18 rotates, the cooling air introduced by the fan 12 cools the end of the field coil 11 and passes through the end of the stator coil 16 as shown by the arrow. Further, the cooling air that has entered the inner diameter side of the rotor spider 2 passes through the ventilation duct 4 and flows into the inter-pole ventilation path 40, and flows between adjacent field coils 11 as shown by the arrow to cool them. In the case of internal cooling, the cooling air also flows through the intra-pole ventilation passage 50 between the pole iron core 10 and the field coil 11 to cool it. Cooling air passing through the intra-magnetic pole ventilation passage 40 between the field coils 11, the intra-magnetic pole ventilation passage 50 between the magnetic pole iron core 10 and the field coil 11, and the exhaust passage 60 is blown out into the air gap 20 by the fan action of the salient poles. death,
Via this, pass through the ventilation duct 15 of the stator 19,
The stator coil 16 and stator core 14 are cooled.

However, in the conventional device described above, the cooling air flowing through the ventilation duct 4 is transferred to the inter-pole ventilation path 40.
However, the amount of flow is very small on the intra-pole ventilation path 50 side, and very large on the inter-pole ventilation path 40 side, and it is the field coil 11 that contributes to the cooling of the field coil 11. Only the cooling air passes through the vicinity, and it cannot be said that the ventilation structure sufficiently considers the ventilation area of the cooling air, the reduction of ventilation resistance, the flow velocity, and the flow volume, and the field coil 11
The drawback was that the cooling efficiency was not necessarily sufficient.

This idea was made in view of the above-mentioned drawbacks of the conventional ones, and it provides an internal ventilation passage between the magnetic pole iron core and the field coil, which extends in the axial direction between the field coils, and A partition member is provided at a predetermined distance from the magnetic coil, restricts the flow of cooling air on the side of the inter-pole ventilation path, and allows a large amount of the restricted cooling air to be introduced into the inside of the magnetic pole ventilation path. A discharge passage is provided which is formed long in the longitudinal direction on the field coil side of the top washer inserted between the magnetic coil, communicates with the internal magnetic pole ventilation passage, and allows the cooling air flowing through the magnetic pole internal ventilation passage to flow out between the magnetic poles. By this,
An object of the present invention is to provide a rotor for a rotating electrical machine that can increase the cooling efficiency of a field coil.

An embodiment of this invention will be described below with reference to FIGS. 5 and 6. In the figure, 3 is the rim, 4
is a ventilation duct, 9 is a magnetic pole, 10 is a magnetic pole iron core, 11
is a field coil, 21 is a top washer, 30 is a manifold, 50 is a magnetic pole iron core 10 and a field coil 1
1, and 22 extends in the axial direction between the magnetic poles 9, that is, between the field coils 11, and is arranged at a predetermined distance from the field coil 11, and is arranged to provide an inter-pole ventilation path. This is a partition member that limits the amount of cooling air flowing through the passage 70 side, introduces a large amount of the restricted cooling air into the intra-magnetic pole ventilation path 50 side, and increases the amount of cooling air flowing on the intra-magnetic pole ventilation path 50 side. Reference numeral 80 denotes a discharge passage formed by forming a longitudinally long groove 80a on the field coil 11 side of the top washer 21, and communicates with the intra-magnetic pole ventilation passage 50.

The following operation will be explained. When the rotor 18 rotates, the cooling air introduced by the fan 12 cools the end of the field coil 11 and further passes through the end of the stator coil 16 to cool it. Further, the cooling air that has entered the inner diameter side of the rotor spider 2 passes through the ventilation duct 4 and flows through the inter-pole ventilation path 70 formed by the partition member 22 arranged between the adjacent field coils 11. The field coil 11 is cooled from the outside. Furthermore, the cooling air also flows through the intra-magnetic pole ventilation path 50 between the magnetic pole iron core 10 and the field coil 11 to cool the field coil 11 from the inside, and flows out between the magnetic poles 9 via the exhaust path 80. Inter-magnetic pole ventilation passage 70 between field coil 11 and partition member 22 and magnetic pole iron core 1
0 and the field coil 11;
The cooling air passing through the exhaust passage 80 is blown out into the air gap 20 by the fan action of the salient poles, passes through the ventilation duct 15 of the stator 19, and cools the stator coil 16 and the stator core 14. In this way, the inter-pole ventilation passage 7 extends in the axial direction between the field coils 11 and has a predetermined interval from the field coil 11.
Partition member 22 that limits the flow rate of cooling air on the 0 side
The field coil 11 of the top washer 21 is
Since a longitudinally long exhaust passage 80 is provided on the side, the cooling air flowing out from the ventilation duct 4 to the inter-pole ventilation passage 40 as in the conventional case is reduced by the partition member 22 in this invention compared to the conventional inter-pole ventilation passage 40. The inter-magnetic pole ventilation passage 70 has a small area, and the flow rate of cooling air can be significantly restricted. A large amount of the restricted cooling air can be introduced into the intra-pole ventilation passage 50 and the exhaust passage 80, and the amount of cooling air flowing on the intra-pole ventilation passage 50 side can be significantly increased.
Further, by reducing the ventilation area of the inter-pole ventilation passage 70, the flow velocity of cooling air also becomes faster. Also,
The ventilation area of the exhaust passage 80 provided on the field coil 11 side of the top washer 21 can also be expanded, and the ventilation resistance when cooling air flows out between the magnetic poles from the exhaust passage 80 can be reduced. Therefore, the cooling efficiency of the field coil 11 can be increased.

Further, as shown in FIG. 7 or FIG.
0 and 31, the magnetic pole internal ventilation passage 5
The ventilation area of the inlet portion of 0 is further expanded or the ventilation resistance is further reduced, and the effect is even higher than that of the above embodiment.

As explained above, this idea consists of an in-magnetic pole ventilation passage provided between the magnetic pole core and the field coil, and a top washer inserted between the magnetic pole core head and the field coil. a discharge passage that is formed long in the direction, communicates with the intra-magnetic pole ventilation passage, and allows cooling air flowing through the intra-magnetic pole ventilation passage to flow out between the magnetic poles;
Arranged between the magnetic poles, extending in the axial direction and having a predetermined distance from the field coil, restricts the flow rate of cooling air in the inter-pole ventilation path and increases the flow rate of cooling air on the intra-magnetic pole ventilation path side. A rotating electric machine that can increase the cooling efficiency of a field coil by providing a partition member in a rim portion and a recess formed in a rim portion to communicate with a ventilation duct and each ventilation path and extend in the axial direction. rotor can be obtained.

[Brief explanation of the drawing]

1 and 2 are longitudinal sectional views and partial plan sectional views showing the rotor of a conventional rotating electrical machine, and FIGS. 3 and 4 are partial plan views showing the rotor of another conventional rotating electrical machine. A plan sectional view and a vertical sectional view, FIGS. 5 and 6 are partial plan sectional views showing a rotor of a rotating electric machine according to an embodiment of this invention, and FIGS. FIG. 2 is a partial plan cross-sectional view showing a rotor of a rotating electric machine according to an embodiment. In the figure, 3 is a rim, 9 is a magnetic pole, 10 is a magnetic pole iron core, 11 is a field coil, 21 is a top washer, 50 is a ventilation passage within the magnetic pole, 80 is a discharge passage, 22 is a partition member, and 70 is a ventilation passage between magnetic poles. be. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Scope of utility model registration request] In a rotor of a rotating electric machine, the rotor of a rotating electric machine includes a rim having a ventilation duct in the radial direction and a plurality of salient magnetic poles attached to the outer periphery thereof, and an inter-pole ventilation passage formed between each of the magnetic poles. an in-magnetic pole ventilation passage provided between the magnetic pole core and the field coil; and a top washer inserted between the magnetic pole core head and the field coil, which is formed long in the longitudinal direction on the field coil side. , a discharge passage that communicates with the intra-magnetic pole ventilation passage and causes the cooling air flowing through the intra-magnetic pole ventilation passage to flow out between the magnetic poles; and a discharge passage that is disposed between the magnetic poles and extends in the axial direction, and that is connected to the field coil. a partition member that has a predetermined interval and limits the flow rate of cooling air on the inter-magnetic pole ventilation path side and increases the flow rate of cooling air on the intra-magnetic pole ventilation path side; A rotor for a rotating electric machine, comprising a recess formed in communication with a ventilation passage and extending in an axial direction.