JP2012200067A - Rotary electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary electric machine which reduces its size by having a new cooling system conducting cooling that does not depend only on the shape of a conventional inner fan for cooling in the machine.SOLUTION: A rotary electric machine includes a stator and a rotor which are provided in a sealed space and is formed so as to circulate air in the sealed space. Specifically, the rotary electric machine has a ventilation passage allowing both longitudinal sides of the rotor to communicate with each other and a ventilation passage provided at a housing and includes an axial flow fan for circulating wind in the housing at an end surface of the rotor.

Description

The present invention relates to a rotating electrical machine.

  As background art in this technical field, there is WO05 / 124971 (Patent Document 1). This patent document 1 discloses that an inner fan fan disposed in the machine is cooled by blowing the outside stator in the axial direction of the rotating shaft with an outer fan fan arranged on the counter drive side. And a fully-enclosed external fan motor in which the rotor is cooled by circulating the air in the machine.

WO05 / 124971 Publication

  Patent Document 1 describes a cooling system in a rotating electrical machine. The rotating electric machine of Patent Document 1 is provided with an internal fan used for cooling in the machine.

  In such a rotating electrical machine, for example, the flow of wind generated by the end ring blades of the rotor is generated in a direction that becomes resistance to the ventilation path for cooling in the machine. It has a shape that serves as a guide for guiding the cooling air, and tends to cause an increase in the size of the inner fan and the entire rotating electric machine.

  For this reason, there arises a problem of an increase in the price of the rotating electrical machine due to an increase in raw materials and an increase in the space for installing the rotating electrical machine. Further, when it becomes necessary to install a heater used to prevent condensation in the machine between the stator and the bracket in the machine, it is essential to further increase the size of the rotating electrical machine.

  As described above, the rotating electric machine using the internal fan tends to increase in size, which may impair the convenience for the user.

  Accordingly, an object of the present invention is to provide a rotating electrical machine that can be reduced in size by having a new cooling system that performs cooling independent of the shape of a conventional inner fan for in-machine cooling.

  In order to solve the above problems, for example, the configuration described in the claims is adopted. The present application includes a plurality of means for solving the above-described problems. For example, a housing, a stator attached to the housing, a rotor rotating by a rotating magnetic field generated by the stator, and the rotation An air hole, which is a continuous ventilation path provided in the non-conductor portion of the child, a rotary shaft whose one end that rotates with the rotation of the rotor protrudes from the housing and serves as an output shaft, and a rotary shaft provided in the housing. A bearing to be supported, a stator attached to the housing, a ventilation path provided in the housing that communicates a space divided between the output shaft side and the non-output side by the rotor attached to the rotating shaft, and an air flow in the housing Is a rotating electrical machine having an axial fan on the rotor end face.

  ADVANTAGE OF THE INVENTION According to this invention, the rotary electric machine which can be reduced in size with the new cooling system which improved cooling efficiency can be provided by providing a blade | wing on a rotor end surface.

It is an example of the block diagram of a rotary electric machine. It is an example of a structure of a rotor. It is an example of the block diagram of a rotary electric machine. It is an example of the cooling structure which applied the rotor end ring. It is an example of the structure which used the inner fan fan and the blade | wing of the rotor end surface together.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the invention will be described with reference to the drawings.

  In this embodiment, an example of a rotating electrical machine that improves the cooling efficiency of the rotor by providing blades on the rotor end face to increase the amount of air flowing through the air hole portion of the rotor will be described.

  FIG. 1 is an example of a configuration diagram of a rotating electrical machine according to the present embodiment.

  The housing 1 comprises a casing of a rotating electric machine made of cast iron, aluminum, thin steel plate and the like formed in a cylindrical shape. A ventilation path 2 that circulates in the housing 1 is provided for the purpose of improving the cooling performance. The rotating electrical machine according to the present embodiment is a fully-enclosed, jacket-cooled rotating electrical machine in which the inside is substantially sealed by the housing 1 and the end brackets 3a and 3b, and the outside air and the inside air are separated. In the present application, the housing 1 and the end brackets 3a and 3b constituting the sealed space may be collectively referred to simply as a housing.

  A stator 4 and a rotor 5 serving as heating elements are disposed in the sealed space. The stator 4 includes a stator core 4a and a stator coil 4b. The stator 4 is fixed to the inner periphery of the housing 1. The stator core 4a is configured by laminating a plurality of thin electromagnetic steel plates. The stator coil 4b is wound around a plurality of slot portions formed in the stator core 4a.

  The rotor 5 is composed of an end ring 5c integrally formed with the rotor core 5a and the rotor conductor bar 5b. The rotor 5 is fixed to the outer periphery of the rotating shaft 6. The rotor core 5a is configured by laminating a plurality of thin electromagnetic steel plates.

  The rotor 5 is rotated by a rotating magnetic field generated by the stator 4. Both ends of the rotating shaft 6 are rotatably held with respect to the end brackets 3a and 3b via bearings 7a and 7b, respectively. Further, one end portion of the rotating shaft 6 is inserted through the end bracket 3a and protrudes to the outside to serve as an output shaft. The outer fan 8 is attached to the other end of the rotating shaft 6 through the end bracket 3b.

  Since the external fan 8 is fixed to the rotating shaft 6, it rotates in synchronization with the rotating shaft 6. The external fan 8 is manufactured from cast iron, aluminum alloy, resin, or the like. The external fan 8 is attached to an outside space 9 formed by the housing 1 and the end brackets 3a and 3b and is covered with an end cover 10.

  In the rotating electrical machine of the present embodiment, cooling is performed in each space of the sealed space outer region 9 and the sealed space inner regions 11a and 11b. The cooling configuration and operation in each space will be described below.

  The outside space 9 of the sealed space is a space outside the space covered with the housing 1 and the end brackets 3a and 3b, and an external fan 8 is placed in the space. An end cover 10 is provided so as to cover the outer fan fan 8, and an opening 12 provided on the end cover 10 so as to face the outer fan fan 8 and a discharge port 13 for discharging air to the outer peripheral surface of the housing 1 are provided. It is a space that communicates with the outside air.

  In the outside space 9 of the sealed space, the outside fan 8 fixed to the rotating shaft 6 rotates, so that outside air is taken in from the opening 12 of the end cover 10. The taken-in outside air is blown from the discharge port 13 of the end cover 10 toward the outer periphery of the housing 1 and the output shaft side, and cools the heat generated inside the rotating electrical machine. At this time, heat dissipation fins 14 are provided in the housing 1 to promote heat dissipation of the device.

  The sealed space inner regions 11a and 11b are sealed spaces in which the housing 1 and the outside air covered by the end brackets 3a and 3b do not communicate with each other. A stator 4 and a rotor 5 serving as heating elements are installed in the enclosed space regions 11a and 11b. The rotary shaft 6 is also placed in the sealed space regions 11a and 11b. As shown in the figure, both the regions 11a and 11b are separated by the stator 4 and the rotor 5, and are substantially independent spaces in the longitudinal direction of the rotating shaft 6. A minute gap exists between the rotor 4 and the stator 5, but it is not large enough to circulate air. Therefore, in this embodiment, the air passage 2 provided in the housing 1 and the air hole 15 provided in the rotor 5 are provided, and the sealed space regions 11a and 11b are communicated with each other. That is, the two regions 11a and 11b communicate with each other through two ventilation paths (the ventilation path 2 and the air hole 15).

  Next, the cooling mechanism will be described. The heat generated by the stationary coil 4b due to the rotation of the rotating electrical machine is radiated to the sealed space regions 11a and 11b and to the outside via the housing 1. On the other hand, heat generated in the rotor 5 is radiated to the regions 11a and 11b in the sealed space and is radiated to the outside through the rotary shaft 6, the bearings 7a and 7b, and the end brackets 3a and 3b.

  In general, the heat generated from the rotor 5 is the highest temperature in the rotating electrical machine, and therefore cooling the rotor 5 is important in improving the cooling performance of the rotating electrical machine. Therefore, when performing in-machine cooling, the blades 16a and 16b are disposed on the end face of the rotor 5. For example, the blades 16a and 16b are formed by processing a thin steel plate at the end face of the rotor 5 into a blade shape. This promotes positive air circulation between the regions 11a and 11b in both sealed spaces.

  In addition, the blades 16a and 16b on the end face of the rotor 5 are axial flow fans provided with an inclination so that air can be blown in the axial flow direction. By sending air to the sealed space region 11b by the blades 16a and 16b, a differential pressure is generated between the sealed space region 11a and the ventilation path 2 of the housing 1 is ventilated. This tilt structure will be described with reference to FIG.

  FIG. 2 shows an example of the shape of the rotor 5. The blades 16a and 16b that are inclined so as to cover a part of the opening surface of the air hole 15 are provided on the end surface of the laminated steel plate of the rotor 5 that becomes the opening surface of the air hole 15. The blades 16a and 16b are provided corresponding to the air holes 15 provided in a plurality at equal intervals in the circumferential direction. In FIG. 2, the vane (16a) on the near side in the axial direction is provided with an inclination direction counterclockwise from the end surface of the steel plate toward the top of the vane 16a. When the rotor 5 rotates in the rotation direction (counterclockwise) shown in FIG. 2, air is sucked from the area in the closed space on the near side, and the air is vented toward the back side inside the air hole 15.

  Moreover, in FIG. 2, the blade | wing (16b) is similarly provided also in the steel plate end surface of the back | inner side. By providing blades on both sides of the rotor 5, cooling can be performed in any rotation direction regardless of the rotation direction of the rotating electrical machine. At this time, the blade 16b is provided so that the direction of inclination from the end surface of the steel plate toward the top of the blade is clockwise. Thereby, in the case of the rotational direction shown in FIG.

  In this way, by arranging the blades of the shape of FIG. 2 at both ends of the rotor 5, a differential pressure is generated so that one of the blades sucks the wind and the other blade discharges, and the air is blown through the air hole. Yes. As a result, even when the rotation direction is reversed, the direction of the wind passing through the air hole is only reversed, so that there is no restriction on the rotation direction in terms of cooling performance.

  Further, since the blades 16a and 16b can be formed by notching and bending the end face of the steel plate, they can be processed extremely simply.

  FIG. 3 is a diagram showing a comparative example, which is an example of a configuration diagram of a rotating electrical machine having a general in-machine cooling system. In addition, the part which is common in a present Example attaches | subjects the same code | symbol, and abbreviate | omits description.

  Often in a rotating electrical machine, forced convection cooling inside the rotating electrical machine is performed by blowing air in the order of the sealed space inner region 11a, the ventilation path 2, the sealed space inner region 11b, and the air hole 15 by the internal fan 17 fixed to the opposite output shaft side In this way, the rotor 5 is cooled.

  Further, the end ring 5c is often provided with integrally formed blades 18 on the end face. For this reason, the internal fan 17 has a function as a guide so as not to receive the resistance of the wind agitated around the end ring 5c by the blades 18. May cause problems. As shown in FIG. 3, the inner fan 17 needs to have a guide shape that extends greatly from the center of rotation to the outer periphery.

  Therefore, in this embodiment, by eliminating the blades 18 of the end ring 5c part, the resistance to the circulation of the in-machine circulation due to the air stirring around the end ring 5c is eliminated, and a rotating electrical machine that can be downsized is provided. be able to. As described above, since the cooling performance can be equivalent even if the rotation direction is reversed and the wind direction is reversed, a structure advantageous for cooling can be realized in a compact manner.

  In the present embodiment, an example of a rotating electrical machine in which the shape of the end ring 5c is changed with respect to the first embodiment will be described.

  FIG. 4 is an example of a configuration diagram of the rotating electrical machine of the present embodiment. In the following, with respect to the present embodiment, differences from the first embodiment will be mainly described, and description of the other will be omitted.

  In this embodiment, the inner diameter portion of the end ring 5c is extended in the axial direction (5d). Thereby, the end ring 5d has a function as a guide for rectifying the flow of the wind generated by the blades 16a and 16b, so that the blowing resistance can be reduced. Further, since the rotor 5 conductor and the end ring 5d have an integral structure, the 5d portion also has a function as a cooling fin of the heat generating conductor, and further improvement in cooling performance can be realized. Further, by providing the extension 5d on both sides of the closed space regions 11 and 11b, the cooling performance can be improved in both forward and reverse rotations.

  In the present embodiment, an example of a rotating electrical machine using the inner fan 17 and the blades 16a and 16b in combination with the first embodiment will be described.

  FIG. 5 is an example of a configuration diagram of the rotating electrical machine of the present embodiment. In the following, with respect to the present embodiment, points different from the first and second embodiments will be mainly described, and description of the other portions will be omitted.

  In this embodiment, the inner fan 17 and the blades 16a and 16b on the end face of the rotor 5 are used in combination. The direction of ventilation generated by the inner fan 17 and the blades 16a, 16b is the same. As a result, it is possible to increase the amount of ventilation air circulating in the machine as compared with the case where each is used alone, so that the cooling performance is improved.

  That is, the blades 16a and 16b shown in the present embodiment are not necessarily alternative to the internal fan 17 and can be used together as in the present embodiment. Therefore, when there is room in the rotating electrical machine, the cooling performance can be further improved by using both together.

  In addition, this invention is not limited to an above-described Example, Various modifications are included. For example, the above-described embodiments have been described in detail for easy understanding of the present invention, and are not necessarily limited to those having all the configurations described. In addition, a part of the configuration of a certain embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of a certain embodiment. Further, it is possible to add, delete, and replace other configurations for a part of the configuration of each embodiment.

  1 ... housing, 2 ... ventilation path, 3a ... output shaft side end bracket, 3b ... anti-output shaft side end bracket, 4 ... stator, 4a ... stator core, 4b ... Stator coil, 5 ... Rotor, 5a ... Rotor core, 5b ... Rotor conductor bar, 5c ... End ring, 5d ... End ring (extension), 6 ... Rotary shaft, 7a ... Output shaft side bearing, 7b ... Non-output shaft side bearing, 8 ... Outer fan fan, 9 ... Outer space area, 10 ... End cover, 11a ... Output shaft side sealed space area, 11b ... Non-output shaft side sealed space area, 12 ... End cover opening, 13 ... End cover discharge part, 14 ... Heat radiation fin, 15 ... Air holes, 16a ... Output shaft side blades, 16b ... Non-output shaft side blades, 17 ... Inner fan, 18 ... End ring blades.

Claims (7)

  A housing, a stator attached to the housing, a rotor rotating by a rotating magnetic field generated by the stator, a first ventilation path provided in the rotor and communicating with the rotor in a longitudinal direction; A rotating shaft that rotates as the rotor rotates, a second ventilation path that is provided in the housing and communicates with the stator and the rotor and is divided into an output shaft side and a non-output side, and A rotating electrical machine comprising: an airflow fan that circulates air in one housing by circulating air through one airflow path and the second airflow path.   The rotating electrical machine according to claim 1, further comprising an external fan provided outside the housing.   3. The rotating electrical machine according to claim 1, further comprising an axial fan on both end surfaces or one end surface of the rotor.   2. The rotating electrical machine according to claim 1, wherein the axial fan is configured by inclined blades provided on an end face of the rotor, and a plurality of the blades are provided in a circumferential direction.   5. The rotating electrical machine according to claim 4, wherein the blades are formed on end faces on both sides in the longitudinal direction of the rotor, and the directions of inclination of the blades formed on both end faces are opposite to each other. Rotating electric machine.   The rotating electrical machine according to any one of claims 1 to 5, wherein the inner peripheral portion of the end ring is extended to serve as a ventilation guide for wind passing through the air hole.   The rotating electrical machine according to any one of claims 1 to 6, wherein an inner fan fan for ventilating the interior of the machine is installed on a rotating shaft in a housing and used in combination with the axial fan.

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