JPH0297251A - Electric rotary machine - Google Patents

Abstract

PURPOSE:To improve cooling air flow and to improve the cooling efficiency by arranging an annular cooling air guide member around a stator coil in the upstream of a ventilation fan with the tip section thereof being arranged closely to the air intake port. CONSTITUTION:Upon rotation of a ventilation fan 11 fitted to a shaft 1, cooling air F flows through the gap 13 between a rotor 7 and a stator 10 and through vents 14... of the rotor 7, where centrifugal air flow passes through a gap formed at the coil end section 9a of a stator coil 9. Cooling air F passed through the gap flows along the inner face of a tubular guide 16 toward an air intake port B at the blade section of the ventilation fan 11 and discharged through a discharge port 15 when the ventilation fan 11 rotates. By such arrangement, cooling effect of the stator coil 9 can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a rotating electrical machine such as a main motor for a vehicle, and particularly to a rotating electrical machine with an improved ventilation cooling structure.

(Prior art) Induction traction motors (hereinafter referred to as IM) for vehicles usually have a cage-shaped rotor structure in order to achieve maintenance-free and high-speed operation. In order to prevent the deterioration of the insulators and decrease in strength due to this, and to make the product as compact as possible, a self-ventilation cooling structure is used with a ventilation fan installed within the frame.

FIG. 7 shows the structure of a conventional general IM of this type,
Cooling air e is sucked into the frame C from the cooling air flow d formed on one end side of the frame C by the rotation of the ventilation fan b attached to the shaft a, and the gap between the rotor f and the stator g and the rotor f are drawn into the frame C. The cooling air e is sent to the frame C through the air holes i...
The cooling air is discharged from a cooling air outlet j formed at the other end to cool the inside of the frame C.

The figure shows a short-circuit ring that connects the rotor bar Ω of the rotor f, and m represents the coil end of the stator coil 0 inserted into the slot of the stator core n of the stator g. show.

(Problem to be Solved by the Invention) However, such a conventional configuration has the following problems. That is, among the cooling air e flowing through the gap between the rotor f and stator g due to the rotation of the ventilation fan b, the cooling air e that flows in the centrifugal direction due to the rotation of the rotor f is shown in FIG. The air flows toward the ventilation fan b along the inner surface of the frame C through the gap p formed in the coil end m of the stator coil 0 at the end of the stator core n shown.

At this time, the flow of the cooling air e in the space A formed between the frame C and the coil end m of the stator coil 0 becomes a turbulent flow as shown in Fig. 9, and the flow remains in this turbulent state. It is sucked into the blade part B of the fan b, passes through the ventilation fan b, and is ejected to the outside from the outlet j.

The turbulent flow in part A above is close to the air intake port B, which is the inlet of the blade of ventilation fan b, and therefore affects the flow of other cooling air e toward ventilation fan b, resulting in the ventilation capacity of ventilation fan b. This was an obstacle to improving cooling efficiency.

The present invention has been made in view of the above-mentioned circumstances.The tatami-like structure has a relatively simple structure, which improves the cooling efficiency inside rotating heavy machinery and improves the reliability of heat generation. The aim is to provide a rotating electric machine with high performance and high performance.

[Structure of the Invention] (Means for Solving the Problems) In order to solve the two-leg problem, the present invention includes a ventilation fan built into the frame, and a cooling system formed at one end of the frame by the rotation of the ventilation fan. A rotating electric machine having a ventilation cooling structure that sucks cooling air into a frame from an air inlet, passes through a gap between at least a rotor and a stator, and directs the cooling air from a cooling air outlet formed at the other end of the frame. In the cooling fan, an annular cooling air guide member is provided on the windward side of the ventilation fan, surrounding the outer periphery of the stator coil, and having a distal end thereof facing near the air intake port of the ventilation fan.

(Function) That is, the present invention has the above-mentioned configuration, so that out of the cooling air flowing through the gap between the rotor and the stator due to the rotation of the ventilation fan, the cooling air that flows in the centrifugal direction due to the rotation of the rotor is removed. The wind passes through the gap formed at the coil end of the stator coil, and this cooling air is guided by the cooling air guide member and flows toward the ventilation fan without causing turbulence. It does not affect the flow of other cooling air. This improves ventilation capacity and improves cooling efficiency.

(Example) Hereinafter, a first example of the present invention will be described with reference to FIGS. 1 and 2.

Figure 2 shows the structure of an induction traction motor (IM) for a vehicle as a rotating electric machine of the present invention. In the figure, 1 is a shaft that is attached to a frame 3 via bearings 2a and 2b for rotation. A rotor 7 is attached to the shaft 1, which is formed by inserting a plurality of rotor bars 5 into the slots of the laminated rotor core 4 and joining ring-shaped short rings 6, 6 to both ends of the rotor bars. It is being

Further, the frame 4 is provided with a stator formed by inserting and connecting a stator coil 9 into a slot of a stator core 8 so as to surround the rotor 7. The shaft is rotated by energizing the stator coil 9.

In addition, a ventilation fan 11 is fitted onto the shaft 1 so as to rotate together with the shaft 1, and the rotation of the ventilation fan 11 causes cooling air F to flow from the cooling airflow fan 12 formed at one end of the frame 3. The rotor 7 and stator 1 are sucked into the frame 3.
The cooling air F is discharged from a cooling air outlet 15 formed at the other end of the frame 3 through a gap 13 with the rotor 7 and an air hole 14 of the rotor 7, thereby cooling the inside of the frame 3. There is. Furthermore, heat generation in the coil and the like when energized is prevented as much as possible.

Further, as shown in FIG. 1, on the windward side of the ventilation fan 11, there is a ventilation fan 1 which surrounds the outer periphery of the coil end portion 9a of the stator coil 9 with a certain gap G and whose tip end is a ventilation fan. A cylindrical kite as an annular cooling air guide member facing near the air intake port B which is the blade portion] 6
is attached to the end face of the stator 1° via a port 17.

According to the configuration in which this cylindrical guide 16 is provided, the flow of the cooling air F is improved as described below. In other words, the rotation of the ventilation fan]]- causes the rotor 7 and stator 1o to
Among the cooling air F flowing through the gap 13 between the rotor 7 and the air hole of the rotor 7], the cooling air F flowing in the centrifugal direction generated by the rotor 70 rotations is directed toward the centrifugal direction of the stator as explained in the conventional example. A gap formed in the coil end portion 9a of the coil 9 (
(not shown). The cooling air F that has passed through this gap flows along the inner surface of the cylindrical kite 16 toward the air intake port B of the blade of the ventilation fan 11, and is discharged to the outside from the discharge port 15 by the rotation of the ventilation fan. Ru.

At this time, the cooling air F passing through the gap formed in the coil end portion 9a of the stator coil 9 flows toward the ventilation fan 11 along the inner surface of the cylindrical guide 16. Therefore, the cooling air F is blocked by the cylindrical kite 16 in the space A between the frame 3 and the cylindrical guide 6.
turbulence will no longer occur. Further, by setting the gap mJG between the cylindrical guide 16 and the stator coil 9 small, the flow of the cooling air F is rectified, and the air exhaust efficiency of the ventilation fan 11 can be improved. Further, by reducing the gap G, the speed of the cooling air F increases, and it becomes possible to improve the cooling effect of the stator coil 9.

3 and 4 show a second embodiment of the present invention. In order to further improve the cooling effect of the stator coil 9, instead of the cylindrical guide 16 of the first embodiment, an inner periphery is used. This kit uses a cylindrical kite 2o with projections 20a integrally molded on the surface side. This is so that the protrusion 20a is interposed between the coil end portions 9a9a of the stator coil 9, and the shape of the protrusion 20a is similar to the coil end portion 9a of the stator coil 9. A certain distance is provided between the coil end portion 9a and the guy l-' 20 so that the cooling air F can flow efficiently.

Further, FIGS. 5 and 6 show a third embodiment of the present invention, in which a cylindrical guide 2 as a cooling air guide member]
is attached to the frame 3 via bolts 22, and the cylindrical guide 21 is shaped to swing a certain gap between the main pole coil 23 and the auxiliary pole coil 24, and the cooling air F
flows between the main pole coil 23 and the auxiliary pole coil 24 and the cylindrical guide 21 toward the ventilation fan 11.

In addition, it goes without saying that the present invention can be modified in various ways without departing from the gist thereof.

In addition, the second of the two series. In the description of the third embodiment, the same parts as in the above-mentioned embodiment are given the same reference numerals, and detailed explanation will be omitted.

As explained in ``Effects of the Invention'' 2, according to the present invention, although the structure is simple such as providing a cooling air guide member, it is possible to improve the flow of cooling air inside the rotating electric machine, thereby improving cooling efficiency. As a result, the heat generation of the coil, etc. can be reduced, and the decrease in life caused by accelerated deterioration of the insulator can be improved.

Furthermore, if the cooling effect is to be the same as the current one, reducing the outer diameter of the ventilation fan will have the effect of reducing the wind noise generated from the blades of the ventilation fan.

[Brief explanation of drawings]

1 and 2 show a first embodiment of the present invention, in which FIG. 1 is an enlarged view of the main part, FIG. 2 is a partially sectional view, and FIG.
FIG. 4 shows a second embodiment of the present invention.
FIG. 3 is an enlarged view of the main part, FIG. 4 is a sectional view taken along line IV-IV in FIG. 3, FIG. 5 and S6 show a third embodiment of the present invention, and FIG. 6 is an enlarged view of the main part, FIG. 6 is a sectional view taken along the line ■-■ in FIG. 5, FIGS. 7 to 9 show conventional examples, and FIG. The figure is an enlarged view of the coil end, and FIG. 9 is an enlarged view of the vicinity of the ventilation fan blade. 3... Frame, 7... Rotor, 9... Stator coil, 10... Stator, 11... Ventilation fan, - Cooling air inlet, 3... Gap, 5... Cooling air outlet, 1... Cooling air guide member (cylindrical guide) F... Cooling air.

Claims (1)

[Claims] A ventilation fan is built into the frame, and as the ventilation fan rotates, cooling air is sucked into the frame from a cooling air inlet formed at one end of the frame, passing through at least the gap between the rotor and stator to cool the air. In a rotating electric machine having a ventilation cooling structure in which wind is drawn out from a cooling air outlet formed at the other end of the frame, the stator coil is surrounded by a stator coil on the windward side of the ventilation fan, and the tip of the ventilation fan is connected to the ventilation fan. A rotating electrical machine characterized by having an annular cooling air guide member provided in a facing position near an intake port.