JPH02136050A - Cooling and ventilating apparatus of electrical rotating machine - Google Patents

Abstract

PURPOSE:To improve cooling properties of an apparatus by opening the opening on one end side opened at both axial ends of the air hole of a rotor to one end side of the internal air of a housing and by causing the opening on the other end side to communicate with one end side of said internal air via a communicating tube provided at a shaft and an air duct provided at said housing. CONSTITUTION:The air hole 6b of a rotor 6 has openings 8a, 8b opened at both axial ends. The opening 8a on one end side is directly opened to the internal air with the intake vent 2 and the opening 8b on the other end side communicates with a communicating tube 9 provided at a shaft 5. Said communicating tube 9 communicates with an air duct 10 provided at a frame 1a via space between a bracket 1b on the other end side and the wheel plate of an internal fan 4 and said air duct 10 is opened to said intake vent 2. According to such a structure, a stator 7 is cooled from the outer peripheral face by wind flowing between ribs 1c, while cooling air is taken in from the openings 8a, 8b of said air hole 6b opened at both ends of the rotor 6 to cool said core from the inside via a rotor air duct 6a and a stator air duct 7a.

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention relates to a cooling ventilation system for a rotating electric machine, which is an open type or a completely enclosed internally cooled type with a cooler, and has an air duct in a stator and a rotor. Regarding equipment.

[Conventional technology]

FIG. 2 shows a sectional view of a conventional example, in which an intake port 2 is provided at one end of a jacket 1 made up of a frame 1a and a bracket 1b, and an exhaust port 3 is provided at the other end. An internal fan 4 for ventilating and exhausting internal air is attached to the shaft 5 with its outer periphery close to the exhaust port 3. Although the intake port 2 and the exhaust port 3 are in direct communication with the outside air and are of an open type, for example, an air/air heat exchanger may be connected to the intake port 2 and the exhaust port 3 to create a completely closed internal cooling system. It can also be a shape.

Now, the rotor 6 and the stator 7 are provided with air ducts 6a and 7a in the radial direction, respectively, and the rotor air duct 6a has a fan function, and air is taken in from the opening 6c of the air hole 6b, which is open at one end, and the air is drawn into the iron core. In addition to being cooled from within, the stator 7 is also cooled by ventilation between its mounting lips 1c. Arrows indicate the overall ventilation path.

[Problem to be solved by the invention]

In the conventional example described above, it is difficult to increase the diameter and number of air holes 6b due to constraints on the outer diameter dimension of rotor 6 and magnetic flux density, etc., so air resistance of air holes 6b tends to increase. In particular, if the iron core length is large (if the air resistance in the air hole 6b is large, the fan action of the rotor air duct 6a will be insufficient, and the rotor 6 and stator 7 will not be cooled sufficiently from the inside. Increasing the diameter is also an option, but the problem is that the stator also becomes larger and the entire electric machine becomes larger.

SUMMARY OF THE INVENTION An object of the present invention is to provide a cooling ventilation device for a rotating electric machine that can cool the electric machine well without increasing the rotor diameter even when the iron core length increases.

[Means to solve the problem]

This invention includes an intake port at one end of the jacket, an exhaust port at the other end, an internal fan whose outer periphery is close to the exhaust port to exhaust internal air, and a rotor air duct that is continuous with air poles of the rotor. , a cooling ventilation device for a rotating electric machine comprising a stator air duct radially connected to the rotor air duct, and a rib that supports the outer circumferential surface of the stator and guides internal air from one end to the other end. The opening at one end, which is open at both ends of the hole in the axial direction, is opened to one end of the inside air of the outer jacket, and the opening at the other end is connected to a communication pipe provided as a shaft and a ventilation duct provided at the outer jacket. This is a cooling ventilation device for a rotating electrical machine that communicates the inside air to one end side through the cooling ventilator.

[Effect]

The cooling air sucked in from the intake port by the action of the internal fan is divided into two types: cooling air that goes directly to the opening at one end of the air hole, and cooling air that goes indirectly to the opening at the other end via the ventilation duct and communication pipe. The cooling air flows on the outer circumferential surface of the stator from one end to the other end. At this time, since the air hole takes in air from both ends, the air hole ventilation length is half of the air hole length, so the ventilation resistance is 1/2, and the air volume load is half, so the ventilation resistance is 1/4 of the square of the air hole length. Overall, the reduction is reduced to 1/8, and the resistance of the air hole portion, which is small in diameter and has magnetic size constraints, is reduced, the amount of ventilation increases, and cooling is improved.

〔Example〕

FIG. 1 shows a cross-sectional view of the embodiment, and the same reference numerals as in FIG. 2 have approximately the same functions. That is, the rotating electric machine has an air intake port 2 at one end of an outer cover 1 made up of a frame 1a and a bracket 1b, an exhaust port 3 at the other end, and an internal fan 4 that exhausts internal air by bringing the outer periphery close to the exhaust port. , a rotor air duct 6a continuous to the air hole 6b of the rotor 6
A stator air duct 7a is radially connected to the rotor air duct h6a, and a rib 1c supports the outer peripheral surface of the stator 7 and guides internal air from one end to the other end.

Now, as a characteristic structure of this embodiment, the air hole 6b of the rotor 6 has openings 8a, 8b opened at both ends in the axial direction.
have. The opening 8a at one end is directly open to the inside air where the intake port 2 is located, while the opening 8b at the other end communicates with a communication pipe 9 provided on the shaft 5. This communication pipe 9 communicates with a ventilation duct 10 provided in the frame 1a through a space between the placket 1b on the other end side and the table plate of the internal fan 4, and this ventilation duct 1O is connected to the air intake duct 10 provided on the one end side. It has an opening at mouth 2. After all, both ends of the air hole 6b are each directly or indirectly connected to the intake port 2.

Although the exhaust port 3 and the ventilation duct 10 appear to be perpendicular to each other in the figure, they are located at different parts of the circumference so that they do not interfere with each other. Although the ventilation duct IC and the communication pipe 9 communicate with each other at the back of the table board of the internal fan 4 as shown in the figure, they may communicate with each other through a ventilation path fixed to the bracket.

According to such a structure, while the stator 7 is cooled from the outer circumferential surface by the wind flowing between the ribs 1c as in the conventional case,
Openings 8a of air holes 6b opened at both ends of rotor 6
, 8b, the cooling air is taken in from the rotor air duct 6a.
The core is cooled from inside through the stator air duct 7a. In this case, in this structure, both ends of the air hole 6b are open, the length of the ventilation path is halved, and the burden of ventilation amount is also halved, so that the ventilation resistance in the air hole is significantly reduced. Due to magnetic conditions, the ventilation resistance in the air holes is a part of the bottleneck in the overall electrical machine, and reducing the ventilation resistance in this area greatly contributes to the cooling of the electrical machine.

〔Effect of the invention〕

This invention includes an intake port at one end of the outer jacket, an exhaust port at the other end, an internal fan that exhausts internal air by having its outer periphery close to the exhaust port, and a rotor air duct that is continuous with the air hole of the rotor. A cooling ventilation system for a rotating electric machine comprising: a stator air duct radially connected to the rotor air duct; and a rib that supports the outer peripheral surface of the stator and guides internal air from one end to the other end. An opening at one end opened at both ends of the air hole in the axial direction is opened to one end side of the inside air of the outer jacket, and an opening at the other end is a communication pipe provided as a shaft and a ventilation duct provided at the outer jacket. Since the internal air is communicated to one end side through the air hole, the ventilation resistance in the small diameter air hole part, which is magnetically restricted in size, is significantly reduced, and this part is also the bottleneck in the ventilation resistance of the entire electrical machine. Therefore, the cooling inside the electric machine, especially the core, is improved, and the electric machine can be made smaller and its output can be increased.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of the embodiment, and FIG. 2 is a sectional view of the conventional example. 1...Outer cover, 2...Intake port, 3...Exhaust port, 4...
... Internal fan, 6... Rotor, 6a... Rotor air duct, 7... Stator, 8a, 3b... Opening,
9... Communication pipe, 10... Ventilation duct.

Claims (1)

[Claims] 1) An intake port on one end of the outer cover, an exhaust port on the other end, an internal fan that exhausts internal air by having its outer periphery close to the exhaust port, and a rotor air duct that is continuous with the air hole of the rotor.
In a cooling ventilation system for a rotating electric machine, which includes a stator air duct that is radially connected to the rotor air duct, and a rib that supports the outer peripheral surface of the stator and guides internal air from one end to the other end, the rotor air hole An opening at one end, which is open at both ends in the axial direction of A cooling ventilation device for a rotating electric machine, characterized in that the inside air is communicated with one end side of the inside air.