JP2001268846A - Electrical rotating machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a ventilating structure of an electrical rotating machine in which temperature gradient of a stator winding and nonuniformity of cooling are eliminated, and a baffle cover can be easily fixed to a stator at a low cost. SOLUTION: This electrical rotating machine is equipped with a stator 2 provided with a plurality of first ventilating ducts 4 which stretch in the radial direction between core blocks 2A and are so formed that gas flows from inner peripheral side toward the outer peripheral direction, a rotor 9 provided with a plurality of second ventilating ducts 10 which stretch in the radial direction between core blocks 9A and are so formed that gas flows from the rotating center side toward the outer peripheral direction, and the baffle cover 6. The plurality of first ventilating ducts 4 and the plurality of second ventilating ducts 10 are arranged in the vicinity of axial direction center positions of the stator 2 and the rotor 9 at uniform intervals. The baffle cover 6 is constituted of an elastic member, whose tip part is bent to the root side of a coil end 3A and molded in an almost U shape.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotating electric machine having a structure in which a ventilation duct for cooling is formed in a stator and a rotor.

[0002]

2. Description of the Related Art Conventionally, rotary electric machines having a structure in which a ventilation duct for cooling is formed on a stator and a rotor are as shown in FIGS. FIG. 5 is a side sectional view of a conventional rotary electric machine, showing an example of a cage type three-phase induction motor.
FIG. 6 is an enlarged side sectional view of a mounting portion of a conventional clamp bar and a wind guide cover. In the figure, 1 is a frame, 2 is a stator, 2A is an iron core block, 3 is a stator winding, 3A is a coil end, 5 is a clamp bar, 7 is a rotating shaft, 8 is a spider, 9 is a rotor, and 9A is An iron core block, 11 is a first ventilation duct, 12 is a second ventilation duct, and 13 is a ventilation guide cover. The frame 1 is provided with an air supply port 1A for sucking a gas serving as cooling air inside the rotating electric machine, and an exhaust port 1B for discharging the gas to the outside. The stator 2 includes a plurality of stacked iron core blocks 2A and a plurality of first ventilation ducts extending in a radial direction between the iron core blocks 2A and formed so that gas passes from the inner circumferential side to the outer circumferential direction. 11 is comprised. In addition, the rotor 9 is disposed via the magnetic gap with the stator 2, extends in the radial direction between the plurality of laminated core blocks 9 </ b> A, and each of the core blocks 9 </ b> A, and gas flows from the rotation center side. It comprises a plurality of second ventilation ducts 12 formed so as to pass in the outer peripheral direction. Here, the ventilation ducts 2A and 9A are arranged at equal intervals over a wide range of axial positions of the stator 2 and the rotor 9. Further, both ends of the core block 2A of the stator 2 in the axial direction are fixed by the clamp bar 5, and the tip end of the clamp bar 5 protruding from the core block is provided with the coil end 3A of the stator winding 3. An L-shaped air guide cover 13 is provided so as to cover the side surface. The fixing of the wind guide cover 13 is performed via a stud 14 which is tapped in the longitudinal direction of the clamp bar 5. In the rotating electric machine having such a configuration, when the rotor 9 rotates, the gas sucked from the air supply port 1A of the frame 1 causes the rib-shaped spider 8 provided on the rotating shaft 7 by the fan action of the rotor 9. Sucked into. Next, the gas sucked into the spider 8 is guided into the rotor 9 and distributed to the respective second ventilation ducts 12 to cool the respective core blocks 9A. Then, after the gas is released into the space on the outer periphery of the rotor 9, the gas flows into the first ventilation duct 11 of the stator 2,
Each core block 2A is cooled. As a result, heat generated due to copper loss and iron loss of the rotating electric machine causes each ventilation duct 11,
The gas is effectively discharged from the exhaust port 1B through the air outlet 12.

[0003]

However, the prior art has the following problems. (1) The first provided in the core block 2A of the stator 2
Since the gas passing through the ventilation duct 11 has a greater ventilation resistance as it enters from the axially opposite ends of the stator 2 toward the center, the gas flows from the first ventilation duct 11 near the axially opposite ends of the stator 2. It is easy to come off, and the inflow of gas decreases near the center. Further, since the wind guide cover 13 only covers the side surface of the coil end 3A of the stator winding 3, gas flowing into the rotating electric machine from the air supply port 1A is not only the rotor 9 side but also the coil end. The amount of inflow to the 3A side also increases, and as a result, the stator coil 3 has a local temperature rise in which the temperature near the center of the coil becomes higher than the coil end portion 3A, so that balanced cooling is achieved. Can not.
As a result, the heat generated by the copper loss and the iron loss of the rotating electric machine is not effectively released, so that there is a problem that the output of the rotating electric machine cannot be expected to be improved. (2) Further, in the conventional technique, the fixing of the clamp bar 5 and the wind guide cover 13 requires machining such as tapping and stud processing, and parts other than the wind guide cover 5 such as studs and nuts. There are problems that the cost and parts cost are high, and that the work of attaching the wind guide cover 13 to the stator 2 is troublesome, and labor and time are required. The present invention has been made in order to solve the above-mentioned problems, and can eliminate a temperature gradient of a stator winding, can eliminate uneven cooling, and easily attach a wind guide cover to a stator. Another object of the present invention is to provide a ventilation structure for a rotating electric machine that can be mounted at a low cost.

[0004]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention according to claim 1 is characterized in that a cylindrical frame having an intake port and an exhaust port is fitted and fixed to an inner periphery of the frame. A stator comprising: a stacked core block; and a plurality of first ventilation ducts extending radially between the core blocks and formed so that gas passes from an inner peripheral side to an outer peripheral side. The stator is arranged via the magnetic gap, and extends in the radial direction between the plurality of stacked core blocks and each of the core blocks, and the gas passes from the rotation center side to the outer peripheral direction. A plurality of second ventilation ducts formed on the rotor and a clamp bar for fixing an iron core block of the stator in an axial direction, and gas flowing from the intake port is supplied to the stator. Axial ends A wind guide cover for guiding wind so as to pass through the side surface of the coil end portion of the rotary electric machine, wherein the first ventilation duct and the second ventilation duct are arranged in the axial direction of the stator and the rotor. In the vicinity of the center position, a plurality of air guide covers are arranged at equal intervals, and the air guide cover is provided with the air guide cover so that a gas flow can be communicated from the air supply port toward the second air duct. The tip portion is curved toward the root of the coil end portion and is formed into a substantially U-shape. Further, the present invention of claim 2 provides:
2. The rotating electric machine according to claim 1, wherein the wind guide cover is formed of an elastic member so that the wind guide cover is detachable from the clamp bar, and a root portion of the wind guide cover and a tip of the clamp bar are provided. 3. One of the portions is provided with a concave portion, and the other is provided with a convex portion for fitting into the concave portion.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a side sectional view of a rotary electric machine showing a first embodiment of the present invention. Components different from the conventional one are denoted by the same reference numerals, description thereof will be omitted, and only different points will be described. In the figure, reference numeral 4 denotes a first ventilation duct, 10 denotes a second ventilation duct, and 6 denotes a wind guide cover. The differences between the present invention and the conventional one are as follows. The first ventilation duct 4 and the second ventilation duct 10 are arranged in the axial direction of the stator 2 and the rotor 9 so that the temperature rise distribution of the stator windings 3 arranged in the axial direction of the stator 2 becomes uniform. This is a point that a plurality of them are arranged at equal intervals near the center position. In addition, the air guide cover 6
Is formed by bending the front end of the air guide cover 6 toward the base of the coil end 3A so that the gas flow from the air supply port 1A to the second ventilation duct 10 can be communicated. That is the point. Next, the operation will be described. When the rotor 9 rotates, the gas sucked into the rotating electric machine from the air supply port 1A of the frame 1 flows to the rotor 9 along the outer periphery of the wind guide cover 13 without flowing to the coil end 3A side. . Due to the fan action of the rotor 9, it is sucked into the rib-shaped spider 8 provided on the rotating shaft 7. Next, the gas flow sucked into the spider 8 is distributed to the second ventilation duct 10 arranged near the center of the rotor 9, and the gas that has passed through the second ventilation duct 10 is supplied to the second ventilation duct 10. It flows into the first ventilation duct 4 of the stator 2 arranged at the same position in the axial direction as 10 and cools the stator 2. Thereby, the partial temperature rise of the stator winding 3 is eliminated,
The temperature rise becomes uniform. Next, the effect of the present example was confirmed by thermal analysis. The result of this thermal analysis is
This will be described with reference to FIG. In the figure, the rotating electric machine having the conventional ventilation structure is indicated by A, and the rotating electric machine having the ventilation structure of the present embodiment is indicated by B. According to this, the temperature rise of the stator winding 3 in the conventional A causes a local temperature rise such that the temperature near the center of the winding becomes higher than that of the coil end 3A. The stator 2
It has been verified that the temperature rise of the stator winding 3 can be made uniform over the axial position. Therefore, in this embodiment, the first and second ventilation facts 4, 10 are arranged at equal intervals near the axial center positions of the stator 2 and the rotor 9.
Are arranged on the stator 2 and the air guide cover 6 formed in a U-shape is provided on the stator 2.
Since the ventilation resistance of the ventilation duct 4 can be reduced and the variation in the amount of gas flowing in can be made uniform, the temperature gradient of the stator winding 3 can be eliminated and the uneven cooling can be eliminated.

Next, a second embodiment of the present invention will be described. FIG. 3 is an enlarged sectional side view showing a fixed portion between the clamp bar and the air guide cover. FIG. 4 is an enlarged sectional side view of a fixed portion of the clamp bar and the air guide cover showing a modification of FIG. In the present invention, in FIG.
Is formed by an elastic member, and a groove is formed in a concave portion 5A on the outer peripheral side of the distal end portion of the clamp bar 5.
A, into the portion facing A, pushes the drawn air guide cover 6 whose root portion is formed into the convex portion 6A, and pushes the drawn air guide cover 6
Is fixed by the spring action. In FIG. 4, a concave portion 5 is formed on the inner peripheral side of the distal end portion of the clamp bar 5.
A groove processing may be performed, and the air guide cover 6 formed by drawing and having a root portion formed into the convex portion 6A may be pressed into the portion facing the concave portion 5A. By pushing the air guide cover 6 into the clamp bar 5 in this manner, the air guide cover 6
Is accurately fitted into the groove 5A of the groove formed in the clamp bar 5, so that it can be freely attached and detached. Further, since the conventional stud is not required, the number of parts can be reduced and the cost can be reduced. Further, since the wind guide cover is formed by drawing, the corners can be formed into a smooth curve, the cooling performance can be improved by reducing the ventilation resistance, and the weight can be reduced by reducing the thickness.

[0007]

As described above, according to the first embodiment of the present invention, a plurality of first and second ventilation facts are arranged at equal intervals near the axial center position of the stator and the rotor. Since the stator is provided with the air guide cover formed in a U-shape, the ventilation resistance of the first ventilation duct provided on the stator is reduced, and the variation in the air volume of the flowing gas is made uniform. Therefore, the temperature gradient of the stator winding can be eliminated, and the uneven cooling can be eliminated. Further, according to the second embodiment of the present invention, the wind guide cover is formed of an elastic member, and the protrusion formed at the base of the wind guide cover is pressed into the protrusion of the clamp bar. The air guide cover and the clamp bar are accurately fitted, and can be freely attached and detached. Further, since the conventional stud is not required, the number of parts can be reduced and the cost can be reduced. In addition, since this air guide cover is formed by drawing, it can be processed into a smooth curve at the corners, it can be expected to improve cooling performance by reducing ventilation resistance, and it is also expected to reduce weight by making it thinner it can.

[Brief description of the drawings]

FIG. 1 is a side sectional view of a rotating electric machine according to a first embodiment of the present invention.

FIG. 2 is an explanatory diagram confirming the effect of the present invention.

FIG. 3 is an enlarged sectional side view showing a fixed portion between the clamp bar and the air guide cover according to the embodiment.

FIG. 4 is an enlarged sectional side view of a fixed portion of a clamp bar and a wind guide cover showing a modification of FIG. 3;

FIG. 5 is a side sectional view of a conventional rotating electric machine.

FIG. 6 is a side cross-sectional view showing fixing of a conventional clamp bar and a wind guide cover.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Frame 1A Air supply port 1B Exhaust port 2 Stator 2A Iron core block 3 Stator winding 4 First ventilation duct 5 Clamp bar 6 Wind guide cover 7 Rotating shaft 8 Spider 9 Rotor 9A Iron core block 10 Second ventilation duct

 ────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masahiro Touchi 2-1 Kurosaki Castle Stone, Yawatanishi-ku, Kitakyushu-shi, Fukuoka F-term (reference) 5H609 BB02 PP02 PP08 PP09 QQ02 QQ16 QQ17 RR27 RR38 RR67 RR75

Claims (2)

[Claims] 1. A cylindrical frame having an intake port and an exhaust port, which is fitted and fixed to an inner periphery of the frame, extends in a radial direction between a laminated core block and each of the core blocks, and A stator comprising a plurality of first ventilation ducts formed so that the gas passes from the inner peripheral side to the outer peripheral direction, and a plurality of the stators are arranged via the magnetic gap with the stator, and A plurality of second cores extending in the radial direction between the core block and each of the core blocks, and formed so that the gas passes from the rotation center side toward the outer periphery.
A rotor comprising a ventilation duct, and a coil bar at both ends in the axial direction of the stator, the gas being supported by a clamp bar for fixing an iron core block of the stator in the axial direction and flowing from the intake port. A wind guide cover for guiding wind so as to pass through the side surface of the part, wherein the first ventilation duct and the second ventilation duct are located at axial center positions of the stator and the rotor. In the vicinity, a plurality of the air guide covers are arranged at equal intervals, and the air guide cover is provided with a tip end of the air guide cover so that a gas flow can be communicated from the air supply port toward the second air duct. A rotating electric machine characterized by being curved to the base side of the coil end portion and formed into a substantially U-shape. 2. The air guide cover is made of an elastic member so that the air guide cover is detachable from the clamp bar, and one of a root portion of the air guide cover and a tip end of the clamp bar. 2. A concave portion is provided on one side, and a convex portion for fitting into the concave portion is provided on the other side.
The rotating electric machine as described.