JP4896785B2 - Rotating electric machine and its stator - Google Patents

Description

  The present invention relates to a large-capacity rotary electric machine represented by a turbine generator and a stator thereof, and more particularly to a rotary electric machine having a structure for circulating a cooling gas in the machine and the stator thereof.

  In general, in a rotating electric machine such as a turbine generator or a large electric motor, a stator in which an armature in which an armature winding is mounted on an armature core formed by laminating electromagnetic steel sheets is supported by a stator frame and integrated. And a rotor having a field iron core equipped with a field coil disposed on the outer periphery of the rotating shaft. The armature and the rotor are cooled by circulating a cooling gas through an in-machine gas flow path formed mainly by the stator frame, the armature and the rotor.

  On the other hand, since cooling gas circulates in the machine generates noise, a structure in which noise is attenuated by a stator frame is generally adopted.

Here, as the capacity increases, electromagnetic vibration generated in the armature increases due to the magnetic attractive force acting between the rotor field and the field. Therefore, when supporting the armature on the stator frame, except for small capacity machines, an elastic support structure with a leaf spring or the like is used to provide vibration isolation between the armature and the stator frame. (For example, refer to Patent Document 1).
JP 2000-92756 A

  In the rotary electric machine described above, the size and weight of the stator are approximately proportional to the size of the armature mainly determined by the capacity of the rotary electric machine, and the cooling gas flow rate required for cooling the armature and the rotor is also determined. Similarly, since it is roughly proportional, the weight of the entire rotating electrical machine increases as the capacity increases.

  For this reason, depending on the installation location and location conditions of the rotating electrical machine, a transportation restriction measure such as adopting a structure that can be divided and transported to reduce the weight during transportation is required. In order to reduce noise, it is necessary to take environmental measures such as installing a soundproof cover around the stator frame. With such an increase in capacity, an increase in the weight and noise of the rotating electrical machine was caused, and it was necessary to take measures to satisfy weight reduction and noise reduction.

The present invention has been made in order to solve the above-mentioned problems, and includes a transportation restriction measure, a weight reduction measure, a noise reduction measure , and a bending that can be caused by the axial extension of the armature core due to thermal expansion during operation. An object of the present invention is to provide a rotating electrical machine that is provided with a measure for relaxing stress .

In order to solve the above problems, one aspect of a rotating electrical machine according to the present invention is provided with an armature configured by mounting an armature winding on an armature core, and disposed on an inner peripheral side of the armature core. A rotor configured to cool the inside of the machine by flowing a cooling gas through a ventilation duct provided on an outer peripheral side of the armature and a gas flow passage formed by the rotor and the armature. In an electric machine, the armature is attached to a fixed base via an elastic support member, and the elastic support member can follow the axial extension of the armature core due to thermal expansion during operation. It has the slide mechanism which can move to a direction, It is characterized by the above-mentioned.
Another aspect of the rotating electrical machine according to the present invention includes an armature configured by mounting an armature winding on an armature core, and a rotor disposed on an inner peripheral side of the armature core. In a rotating electrical machine configured to cool a machine by circulating a cooling gas through a ventilation duct provided on the outer peripheral side of the armature, a gas flow path formed by the rotor and the armature, Attach the armature to the fixed base via an elastic support member at the axial center position of the armature core, and further follow the axial extension of the armature core due to thermal expansion during operation. The armature is supported so as to be movable in the axial direction with respect to the fixed base near both ends in the axial direction.

Also, one aspect of the stator of the rotating electric machine according to the present invention includes an armature configured by mounting an armature winding on an armature core disposed so as to surround the rotor, and the outer peripheral side of the armature In a stator of a rotating electrical machine configured to cool a machine by circulating a cooling gas through a ventilation duct provided in a gas flow path formed by the rotor and the armature, via an elastic support member The armature is attached to a fixed base, and the elastic support member has a slide mechanism that is movable in the axial direction of the armature core so as to follow the axial extension of the armature core due to thermal expansion during operation. It is characterized by this.
Further, another aspect of the stator of the rotating electric machine according to the present invention includes an armature configured by mounting an armature winding on an armature core disposed so as to surround the rotor. In the stator of a rotating electric machine configured to cool the inside of the machine by circulating a cooling gas through a ventilation duct provided on the outer peripheral side, a gas flow path formed by the rotor and the armature, the armature core The armature is attached to the fixed base via an elastic support member at the axial center position of the armature, and further, close to both axial ends so as to follow the axial extension of the armature core due to thermal expansion during operation. The armature is supported so as to be movable in the axial direction with respect to the fixed base.

In the present invention, an armature constituted by mounting an armature winding on an armature core is directly attached and fixed to a fixed base via an elastic support member. The armature core is structured to be movable in the axial direction so that it can follow the axial expansion of the armature core due to expansion . This eliminates the need for a stator frame that conventionally supports and fixes the armature, reduces weight during transportation, and can also absorb electromagnetic vibration generated in the armature core during operation by the elastic support member. it can. Therefore, vibration propagation to the fixed base can be suppressed, and noise can be reduced. Furthermore, bending stress that can be caused by the axial expansion of the armature core due to thermal expansion during operation can be reduced.

  Hereinafter, a typical embodiment of a rotating electrical machine according to the present invention will be described with reference to the drawings.

(First embodiment)
1st Embodiment which concerns on the rotary electric machine of this invention is described using FIG. 1, FIG. FIG. 1 is a vertical partial cross-sectional view of the rotating electrical machine according to the present embodiment, and FIG. 2 is a cross-sectional view taken along the line II-II in FIG.

  In FIG. 1, a central cooling air guide 3, an end cooling air guide 4, and ventilation ducts 5a, 5b, and 5c for connecting them are provided on the outer periphery of the armature core 1 to which the armature winding 2 is mounted. Yes. The armature core 1 is attached to the fixed base 6 via an elastic support member 7. The elastic support member 7 is disposed on the side surface of the armature core 1 near both ends in the axial direction. A sound absorbing panel 9 is attached to the periphery and the lower surface of the fixed base 6. In addition, an armature cover 8 having a sound absorbing material attached to the inner surface is installed on the fixed base 6 so as to cover the armature core 1, the central cooling air guide 3, the end cooling air guide 4, and the ventilation duct 5a. .

  On the other hand, a fan 12 is attached to the rotor 11, and the cooling gas boosted by the fan 12 circulates in the central cooling air guide 3 from the end cooling air guide 4 through the ventilation ducts 5 a and 5 b. The armature winding 2, the armature core 1, and the in-machine structure are cooled.

  Noise generated by the flow of the cooling gas is reduced when passing through the cooling air guides 3 and 4 and the ventilation ducts 5a, 5b and 5c, and further reduced by the sound absorbing panel 9 when passing through the armature cover 8. The Similarly, when passing through the fixed base 6, noise is reduced by the sound absorbing material provided on the surface of the fixed base 6.

  In addition, the electromagnetic vibration in the elliptical mode of the armature core 1 generated by the magnetic attractive force based on the rotor 11 is attenuated by the elastic support member 7 and hardly transmitted to the fixed base 6 and the armature cover 8.

  In this embodiment, since the cooling gas does not touch the inner surface of the armature cover 8, a sound absorbing material such as glass wool or rock wool fixed with a steel plate having a number of through holes such as punching metal and expanded metal is used. It is possible to suppress the reflection of sound in the armature cover that occurs when a normal steel sheet is used, and as a result, the thickness of the outer surface of the armature cover 8 is increased. In addition, noise transmitted from the armature cover 8 to the outside can be reduced.

  Further, the ventilation ducts 5a, 5b, and 5c attached to the outer periphery of the armature only form the cooling gas flow path, and can sufficiently satisfy the function with a thin steel plate or the like. Therefore, it is not necessary to increase the weight of the entire rotating electrical machine in order to reduce noise.

  Furthermore, since the armature cover 8 can be manufactured separately from the components such as the rotor and armature constituting the rotating electric machine, the degree of freedom is increased such as outdoor installation and selection of constituent materials corresponding to other special conditions. Further, since the armature cover 8 can be attached to the fixed base 6 with fastening parts that are easy to disassemble and assemble, such as bolts, when installing the rotating electric machine in a place where the transportable weight and dimensions are limited, Can be removed and transported.

  In this embodiment, the gas cooler 10 is installed. However, instead of the gas cooler 10, a filter, a silencer, or the like may be installed to use outside air as the cooling gas.

(Second Embodiment)
A second embodiment of the rotating electrical machine of the present invention will be described with reference to FIG.

  FIG. 3 is a vertical partial cross-sectional view of the rotating electrical machine according to the present embodiment. Here, the same code | symbol is attached | subjected to the same or similar structure as 1st Embodiment, and the overlapping description is abbreviate | omitted.

  In the configuration of FIG. 1 described in the first embodiment, when the armature core 1 is long in the axial direction or when the armature winding 2 is a rotating electric machine having a large temperature rise during operation, the rotating electric machine is operated. As the temperatures of the armature core 1 and the armature winding 2 rise, the armature core 1 thermally expands in the axial direction and becomes relatively longer than the fixed base 6.

  For this reason, when the elastic support member 7 is arrange | positioned at the both ends of the armature core 1, the position of the armature side fixing | fixed part of the elastic support member 7 upper part and the lower base side fixing | fixed part will shift | deviate, As a result, elasticity When a bending force acts on the support member 7 and the armature core 1 is long or when the temperature rise value of the armature core 2 is large, repeated operation and stop may cause fatigue failure due to repeated bending stress.

  Therefore, in the present embodiment, when the armature core 1 is a rotating electric machine that is long in the axial direction, as shown in FIG. 3, the elastic support member 7 that supports and fixes the armature to the fixed base 6 is provided at the armature central portion. The elastic support members 7a that can be moved in the axial direction of the armature core are provided at both ends in the axial direction of the armature core 1 so as to follow the axial extension of the armature core 1 during operation. The armature core 1 and the fixed base 6 are supported.

  Here, the elastic support member 7 is disposed and fixed at the center portion of the armature core 1 to prevent the influence of the axial movement due to the thermal expansion of the axial center position of the armature core 1 during operation. Can do. In addition, the elastic support member 7a is provided with a rotation mechanism that rotates the elastic support member 7a around each support point with respect to the axial movement of the armature core 1 at each support portion of the armature core 1 and the fixed base 6. Therefore, it is possible to prevent the bending stress from being generated or to reduce the bending stress with respect to the axial movement of the armature core 1.

  Further, instead of the rotation mechanism, the elastic support member 7a is provided with a slide mechanism so that the support point of the armature core 1 or the fixed base 6 slides in the axial direction when the armature core 1 moves in the axial direction. Even if it comprises, the same effect can be acquired.

1 is a vertical partial cross-sectional view of a rotating electrical machine according to a first embodiment of the present invention. FIG. 2 is a cross-sectional view taken along line II-II in FIG. 1. The longitudinal cross-sectional view of the rotary electric machine which concerns on the 2nd Embodiment of this invention.

Explanation of symbols

1: Armature iron core 2: Armature winding 3: Central cooling air guide 4: End cooling air guide 5a, 5b, 5c: Ventilation duct 6: Fixed base 7, 7a: Elastic support member 8: Armature cover 9 : Sound absorbing panel 10: Gas cooler 11: Rotor 12: Fan

Claims (8)

An armature configured by mounting an armature winding on an armature core, and a rotor disposed on an inner peripheral side of the armature core, and a ventilation duct provided on an outer peripheral side of the armature; In a rotating electrical machine configured to cool a machine by circulating a cooling gas through a gas flow path formed by the rotor and the armature,
The armature is attached to a fixed base via an elastic support member ,
The elastic support member has a slide mechanism that is movable in the axial direction of the armature core so as to follow the axial extension of the armature core due to thermal expansion during operation;
Rotating electric machine. An armature configured by mounting an armature winding on an armature core, and a rotor disposed on an inner peripheral side of the armature core, and a ventilation duct provided on an outer peripheral side of the armature; In a rotating electrical machine configured to cool a machine by circulating a cooling gas through a gas flow path formed by the rotor and the armature,
The armature is attached to the fixed base via an elastic support member at an axially central position of the armature core;
Supporting the armature so as to be movable in the axial direction with respect to the fixed base near both axial ends so as to follow the axial extension of the armature core due to thermal expansion during operation;
Rotating electric machine according to claim. The rotating electrical machine according to claim 1, wherein the elastic support member is attached to a side surface portion of the armature core . The rotating electrical machine according to any one of claims 1 to 3, wherein a detachable sound absorbing member is attached to a surface of the fixed base . So as to cover the armature rotary electric machine according to any one of claims 1 to 4, characterized that you provided with the fixed base to the armature cover without passing through the stator. The rotating electrical machine according to claim 5 , wherein a sound absorbing member is attached to an inner surface of the armature cover . An armature including an armature winding mounted on an armature core disposed so as to surround the rotor is provided, and is formed by a ventilation duct provided on an outer peripheral side of the armature, the rotor, and the armature In the stator of the rotating electric machine configured to cool the inside of the machine by circulating the cooling gas through the gas flow passage,
The armature is attached to a fixed base via an elastic support member,
The elastic support member has a slide mechanism that is movable in the axial direction of the armature core so as to follow the axial extension of the armature core due to thermal expansion during operation;
A stator of a rotating electric machine characterized by An armature including an armature winding mounted on an armature core disposed so as to surround the rotor is provided, and is formed by a ventilation duct provided on an outer peripheral side of the armature, the rotor, and the armature In the stator of the rotating electric machine configured to cool the inside of the machine by circulating the cooling gas through the gas flow passage,
The armature is attached to the fixed base via an elastic support member at an axially central position of the armature core;
Supporting the armature so as to be movable in the axial direction with respect to the fixed base near both axial ends so as to follow the axial extension of the armature core due to thermal expansion during operation;
A stator of a rotating electric machine characterized by

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