JPH04368450A - Salient pole electric rotating machine - Google Patents

Abstract

PURPOSE:To force cooling air to flow in a ventilating duct of a stator core by suppressing air, flowing into the spaces between magnetic poles arranged in the periphery of a rotor rim via ventilating ducts from a rotor spider, from flowing out dividedly in an axial direction of the magnetic poles from the inter- pole spaces. CONSTITUTION:In a salient pole electric rotating machine, between magnetic poles 5 of a salient pole rotor provided on a rotary shaft through a rotor spider 1 and a rotor rim 2, partitioning plates 17 are provided vertically to an axial direction of the magnetic poles 5. Cooling air, flowing in from the rotor spider 1 via the rotor rim 2, is allowed to flow in stator core ducts 7 to pass through spaces between the partitioning plates 17 provided between the magnetic poles.

Description

[Detailed description of the invention]

[Purpose of the invention]

0001

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

0002

[Prior Art] As seen in Japanese Utility Model Publication No. 14304/1983, in medium- to low-speed, large-capacity water turbine generators, etc., a radial ventilation cooling method is used that utilizes the centrifugal fan effect of a rotor spider and a rotor rim. is taken.

[0003] The cooling air inside this type of salient pole rotating electric machine is
Ventilation duct 3 provided in the radial direction of the rotor spider 1 and the rotor rim 2 attached to the rotor spider 1 in FIG.
Due to the centrifugal fan effect of It is guided to the interspace 6. The air guided to the interpole space 6 passes through a stator core duct 7 provided in the radial direction of the stator core 8, cools the stator core 8 and the stator windings 9 in the stator core 8, and fixes the stator core 8. After passing through the child core duct 7, the air passes through the air chamber 11 of the stator frame 10 and enters the air cooler 12. A ventilation guide plate 13 is provided at the axial end of the stator frame 10, and this ventilation guide plate 13 directs a part of the air that flows in the axial direction from the space 6 between the magnetic poles of the rotor to the end of the stator winding 9. The air is guided from the ventilation hole 14 of the stator frame 10 to the air chamber 11 along the direction of the stator frame 10, and the end portion of the stator winding 9 is cooled. The air cooled through the air cooler 12 circulates to the rotor spider 1 through a passage formed between the ventilation guide plate 13 and the jacket 15. On the other hand, the rest of the air branched in the axial direction from the space 6 between the magnetic poles of the rotor flows to the leakage spider 1 from the air shield 16 formed between the ventilation guide plate 13 and the rotor.

0004

[Problem to be Solved by the Invention] The flow branching in the axial direction from the space 6 between the magnetic poles of the rotor is caused by the passage resistance of the flow path passing inside the ventilation guide plate 13 along the ends of the stator windings 9. This occurs because the winding loss is lower than that of the iron core duct 7, and the windage loss due to the air flow is large, accounting for nearly 1/3 of the total windage loss. In addition, the air leaking from the air shield 16 and flowing to the rotor spider 1 is transferred to the ventilation duct 3 of the rotor rim 2.
The rotor is heated due to rotor loss while passing through the inner space and reaching the interpole space 6, and in that state is recirculated to the ventilation duct 3, which causes a decrease in the efficiency of the main engine.

In view of the above-described drawbacks of the conventional art, the present invention provides salient poles with high cooling efficiency that can prevent air from flowing out in the axial direction from the space between the magnetic poles and force cooling air to flow into the stator core duct. The purpose is to provide a type of rotating electric machine. [Structure of the invention]

[0006]

[Means for Solving the Problems] In order to achieve the above object, in the salient pole rotating electric machine of the present invention, a plurality of partition plates are provided between the magnetic poles of the rotor perpendicularly to the axial direction of the magnetic poles.

[0007]

[Operation] Since the present invention is constructed as described above, the windage loss due to the ventilation system from between the rotor magnetic poles in the axial direction is suppressed, the total windage loss is reduced, and the efficiency of the main engine is increased.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. FIG. 1 is a sectional view of a main part of a salient pole type rotating electric machine showing an embodiment of the present invention. As shown in the figure, a plurality of partition plates 17 are provided between rotor magnetic poles 5,
A duct 18 between the magnetic poles is formed. A ventilation guide plate 13 is provided at the upper end of the stator frame 10, and air is sealed off from the rotor. An air cooler 12 is arranged on the outer peripheral surface of the stator frame 10.

In this way, the main flow of cooling air is forced into the stator core duct 8 through the rotor spider 1, the ventilation duct 3 in the rotor rim 2, and the inter-pole duct 18 formed by the magnetic poles 5 and the partition plate 17. Air chamber 11, air cooler 1
2 through a passage between the ventilation guide plate 13 and the jacket 15.

A small amount of air leaking to the end of the stator winding 9 in the air gap between the inter-pole duct 18 and the stator core duct 7, which are formed by the magnetic poles 5 and the partition plate 17, flows through the ventilation hole 14 to the air chamber 11. be led to.

The lower end of the rotor spider 1 is closed so that air leaking to the lower end of the stator winding 9 does not flow into the ventilation duct 3 in the rotor rim 2. At this time, the lowest rotor rim 2 internal ventilation duct 3 is located above the lower end of the rotor spider 1. Next, the operation of this embodiment will be explained with reference to FIG.

[0012] The overall ventilation resistance of the ventilation system path is the stator core part,
Three ventilation resistors, the upper end of the stator winding and the lower end of the stator winding, are superimposed. In FIG. 2, 23 is a conventional stator core overall ventilation resistance curve, 19 is a conventional stator winding upper end passage resistance curve, 21 is a conventional stator winding lower end passage resistance curve, and 26 is a conventional stator winding upper end passage resistance curve. This corresponds to the total resistance curve. On the other hand, according to this embodiment, since the flow of air in the axial direction from between the magnetic poles is blocked, the resistance curves at the upper end of the stator winding and the lower end of the stator winding, which correspond to conventional Nos. 19 and 21, are respectively 20, 22, and the ventilation resistance is smaller than that of the conventional one. Therefore, the total ventilation resistance curve according to this embodiment is 27, and the total resistance is smaller than that of the conventional case.

The fan characteristic curve of the rotor is 28, and the point of intersection with curve 26 is the conventional operating point 30. At this time, the pressure applied to the cooling air of the rotor fan is P0, but if it is kept constant, the operating point in this embodiment is 31, and the rotor fan characteristic can be lowered to a curve of 29.

[0014]

[Effects of the Invention] As described above, according to the present invention, the outflow of air in the axial direction from the space between the rotor magnetic poles is suppressed, the total ventilation resistance is reduced, and a salient pole electric machine with high ventilation efficiency is provided. be able to.

[Brief explanation of drawings]

[Fig. 1] A cross-sectional view of essential parts of a salient pole type rotating electrical machine showing one embodiment of the present invention.

[Fig. 2] Diagram for showing the action of the present invention

[Fig. 3] Cross-sectional view of a salient pole type rotating electric machine to show the conventional technology

[Explanation of symbols]

1...Rotor spider 2
...Rotor rim 3...Ventilation duct
4...Vent hole 5...Magnetic pole
7...Stator core duct 8...Stator core
9...Stator winding 10...Stator frame
11...Air chamber 12...Air cooler
13...Ventilation guide plate 15...Outer cover
17... Partition plate 18... Duct between magnetic poles

Claims (1)

[Claims] [Claim 1] A plurality of partition plates are provided perpendicularly to the axial direction of the magnetic poles between the magnetic poles of a salient pole rotor that is disposed on the rotating shaft via a rotor spider and a rotor rim. A salient pole type rotating electrical machine.