Direct-cooling doubly-fed motor heat dissipation structure

Abstract

The invention discloses a direct-cooling doubly-fed motor heat dissipation structure, and relates to the technical field of wind driven generators, the direct-cooling doubly-fed motor heat dissipation structure comprises a motor shell, a rotor, a stator and a shaft are sequentially installed in the motor shell, an end cover is installed on one side of the motor shell, an end cover wind chamber is arranged between the end cover and the stator, and a wind shield is connected in the end cover wind chamber through a fastener; and the wind shield divides the end cover wind chamber into two areas. In the operation process of the generator, cooling air enters the generator from the upper side of the end cover air chamber, due to the existence of the wind shield, the size of the end cover air chamber is reduced, the flow speed of the cooling air flowing through the stator end winding is increased, the end heat dissipation efficiency of the stator winding is improved, and meanwhile, the wind shield plays a role in guiding flow; cooling air flows into the bottom of the generator end cover wind chamber along the wind shield, the air flow at the bottom of the generator end cover chamber is increased, winding heat dissipation at the bottom of the generator is facilitated, and the uniformity of temperature distribution at the end of the winding is improved.

Description

Technical Field

[0001] The invention relates to the technical field of wind turbine generators, and in particular to a heat dissipation structure of a direct-cooled doubly-fed generator. Background Art

[0002] Direct-cooled double-fed asynchronous wind turbine generator is the mainstream model currently used in wind power systems. The internal wind path of the generator is shown in the figure below. Figure 3 As shown, cooling air enters the generator from both ends of the base, enters the back of the base along the rotor axial ventilation holes and radial ventilation ducts, and then takes the heat out through the cooling fan. The wind pressure source is provided by the rotor ventilation blades and the cooling fan.

[0003] Due to the influence of the generator base foot, electromagnetic scheme and end lead structure, the space of the end cover on one side of the generator is too large. After the cooling air enters the generator end cover room, the flow rate is low, resulting in low heat dissipation efficiency on the winding surface and excessively high temperature at the winding end. At the same time, due to the large diameter of the generator, the cooling air flow near the bottom of the generator is insufficient, and the temperature distribution of the generator winding is uneven. Therefore, it is necessary to adopt an additional heat dissipation structure for the wind chamber with a larger wind chamber to improve the heat dissipation efficiency of the end winding and improve the temperature uniformity of the end winding. Summary of the invention

[0004] In view of the shortcomings of the prior art, the present invention provides a direct-cooled doubly-fed motor heat dissipation structure, which is suitable for the end cover wind chamber of a large direct-cooled doubly-fed generator, adds a wind shield structure, improves the heat dissipation performance, reduces the end winding temperature, improves the heat dissipation of the bottom winding of the generator, and improves the uniformity of the winding temperature distribution.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A direct-cooled doubly-fed motor heat dissipation structure comprises a motor housing, wherein a rotor, a stator and a shaft are sequentially mounted in the motor housing, and an end cover is mounted on one side of the motor housing, an end cover air chamber is provided between the end cover and the stator, and a wind shield is connected in the end cover air chamber via fasteners.

[0007] Preferably, the wind shield plate divides the end cover air chamber into two areas, and the two areas are respectively a non-cooling air inlet chamber and a cooling air inlet chamber.

[0008] The beneficial effects of the present invention are:

[0009] The present invention utilizes a wind shield to separate the end cover air chamber into two areas, a non-cooling air inlet chamber and a cooling air inlet chamber. When the generator is in operation, cooling air enters the generator from the upper side of the end cover air chamber. Due to the presence of the wind shield, the volume of the end cover air chamber becomes smaller, and the flow rate of the cooling air flowing through the stator end winding increases, thereby improving the heat dissipation efficiency of the stator winding end. At the same time, the wind shield plays a guiding role, and the cooling air flows along the wind shield into the bottom of the generator end cover air chamber, thereby increasing the air flow at the bottom of the generator end cover chamber, which is beneficial to the heat dissipation of the winding at the bottom of the generator and improves the uniformity of the temperature distribution of the winding end. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for the specific embodiments or the description of the prior art. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn according to the actual scale.

[0011] Figure 1 A schematic diagram of a cross-sectional top view of the generator structure of the present invention;

[0012] Figure 2 It is a side structural schematic diagram of the generator windshield of the present invention;

[0013] Figure 3 Schematic diagram of the wind path of the generator of the present invention.

[0014] In the figure: 1. fastener; 2. wind shield; 3. shaft; 4. end cover; 5. rotor; 6. stator. DETAILED DESCRIPTION

[0015] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0016] Example, see Figure 1-3 A direct-cooled doubly-fed motor heat dissipation structure comprises a motor housing, wherein a rotor 5, a stator 6 and a shaft 3 are sequentially mounted in the motor housing, and an end cover 4 is mounted on one side of the motor housing, an end cover air chamber is arranged between the end cover 4 and the stator 6, and a wind shield 2 is connected to the end cover air chamber through a fastener 1, and the wind shield 2 divides the end cover air chamber into two areas, and the two areas are respectively a non-cooling air inlet chamber and a cooling air inlet chamber;

[0017] The present invention utilizes the wind shield 2 to separate the end cover air chamber into two areas, a non-cooling air inlet chamber and a cooling air inlet chamber. When the generator is in operation, cooling air enters the generator from the upper side of the end cover air chamber. Due to the presence of the wind shield 2, the volume of the end cover air chamber becomes smaller, and the flow rate of the cooling air flowing through the end winding of the stator 6 increases, thereby improving the heat dissipation efficiency of the end of the stator 6 winding. At the same time, the wind shield 2 plays a guiding role, and the cooling air flows along the wind shield 2 into the bottom of the generator end cover air chamber, thereby increasing the air flow at the bottom of the generator end cover chamber, which is beneficial to the heat dissipation of the winding at the bottom of the generator and improves the uniformity of the temperature distribution at the end of the winding.

[0018] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A direct-cooled doubly-fed motor heat dissipation structure, comprising a motor housing, wherein a rotor (5), a stator (6) and a shaft (3) are sequentially installed in the motor housing, and an end cover (4) is installed on one side of the motor housing, characterized in that: An end cover air chamber is provided between the end cover (4) and the stator (6), and a wind shield (2) is connected to the end cover air chamber via a fastener (1).

2. A direct-cooled doubly-fed motor heat dissipation structure according to claim 1, characterized in that: The wind shield (2) divides the end cover air chamber into two areas, and the two areas are respectively a non-cooling air inlet chamber and a cooling air inlet chamber.

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