KR200292195Y1 - Cooling structure of stator core for generator - Google Patents

Abstract

The present invention relates to a cooling structure of a generator stator core that forms a plurality of protrusions along the outer diameter of the stator core to increase the overall surface area of the stator core to which the cooling air contacts, thereby efficiently cooling the temperature of the generator.

The cooling structure of the generator stator core according to the present invention is a plurality of yoke parts formed in the inner circumference so that the stator coils are wound, and a plurality of yokes protruded at regular intervals to the frame side along the outer diameter to release heat generated in the power generation process. A protrusion and a core body formed by joining a plurality of layers of thin plates including the plurality of yokes and protrusions are provided.

Description

Cooling structure of stator core for generator

The present invention relates to a cooling structure (stator core) of the generator stator core. More specifically, the cooling structure of the generator stator core to maximize the cooling efficiency of the generator by increasing the contact area of the cooling air of the stator core, which is the heat generating source of the generator. It is about.

In general, a generator is a device that induces alternating current in a coil while rotating a rotor in which magnetic flux is generated by a field coil with the power of an engine. The generator is fixed in a cylindrical shape inside a frame, and rotates at the center of the stator. While having a structure including a rotor (Rotor) for inducing alternating current.

1 is a cross-sectional structural view showing the overall structure and components of a general generator, Figure 2 is a cross-sectional view showing a conventional generator stator core.

1 and 2, a shaft 2 fixed with a half-load bearing 12, a load-side bracket 10, and a half-load bracket 11 is inserted in the center of the frame 1 of the generator G. The rotor core 4 is wound around the shaft 2 to which the rotor coil 6 is wound.

A stator core 3 is enclosed outside the rotor core 4 and coupled to the frame 1, and a rectifier connected to the stator core 3 conducts alternating current generated while the rotor core 4 is rotated. (Not shown) to supply to various electrical equipment.

On the other hand, the stator core 3 is configured so that a thin plate can be bonded in multiple layers to wind the stator coil 5, as shown in Figure 2 to the winding of the stator coil 5 in the inner side of the cylindrical body Several yoke portions 3a are formed.

The general generator (G) having the structure as described above draws cold outside air into the generator through the cooling air inlet cover (17) to cool the stator core (3) and the stator coil (5), which is a heating source, inside The core and the coil of the cooler, and by cooling the generator (G) by discharging to the outside through the cooling air outlet cover 18 through the fan (13).

However, in the conventional stator core, as shown in FIG. 2, the outer diameter of the stator core in contact with the cooling air is circular, and the surface area a1 in contact with the cooling air is π × D × L (D: stator core width, L: stator core length), so that the total surface area in contact with the cooling air is relatively small, which lowers the cooling efficiency.

Accordingly, an object of the present invention is to create a plurality of protrusions along the outer diameter of the stator core to increase the total surface area of the stator core in contact with the cooling air to cool the generator temperature efficiently cooling the generator stator core To provide.

In order to achieve the above object, the cooling structure of the generator stator core according to the present invention has a plurality of yoke portions formed in the inner circumference such that the stator coil is wound, and is fixed to the frame side along the outer diameter to release heat generated in the power generation process. A core body is formed by joining a plurality of protrusions spaced apart from each other and a plurality of layers of thin plates including the plurality of yokes and protrusions.

1 is a cross-sectional view showing the overall structure and components of a typical generator.

Figure 2 is a cross-sectional view showing a conventional generator stator core.

3 is a cross-sectional view showing a cooling structure of the generator stator core according to the present invention.

Explanation of symbols on the main parts of the drawings

1: frame 2: shaft

3: stator core 4: rotor core

5: stator coil 6: rotor coil

10: Load side bracket 11: Half load side bracket

12: half load side bearing 13: fan

17: cooling air inlet cover 18: cooling air outlet cover

30: core body 31: yoke part

32: protrusion

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

3 is a cross-sectional view showing a cooling structure of the generator stator core according to the present invention.

Referring to FIGS. 1 and 3, the generator G according to the present invention has a half load side bearing 12, a load side bracket 10, and a half load side bracket 11 at the inner center of the frame 1. The shaft 2 supported and fixed by this is inserted.

A rotor coil 6 and a stator coil 5 are fixed to the outside of the shaft 2, and a stator core receives a mechanical input between the shaft 2 and the frame 1 to generate an electrical output by an electromagnetic force. 3 and the rotor core 4 are fixed.

The rotor core 4 is fixed to the outer circumference of the shaft 2 to rotate with the shaft 2 under the power of the engine to induce alternating current in the rotor coil 6 to obtain the output of the generator G. .

The stator core 3, which winds the stator coils 5 to the outside of the rotor core 4 and induces current, forms a core body 30 by joining multiple layers of thin plates.

In the stator core 3, as shown in FIG. 3, a plurality of yoke portions 31 are formed at regular intervals on the inner circumference such that the stator coil 5 is wound.

In addition, the stator core 3 has a plurality of protrusions 32 for releasing heat generated in the power generation process of the generator G on the outer periphery and protrude at regular intervals toward the frame 1 along the outer diameter.

At this time, the protruding portion 32 of the stator core 3 is formed to protrude in a gear shape having a height t within a range that does not interfere with the flow of magnetic flux flowing through the stator core 3.

The generator G having the structure as described above draws cool external air into the generator through the cooling air inlet cover 17 to release heat generated in the power generation process, and then rotates the rotor core 4 and the stator. The cores 3 and the rotor coils 6 and the stator coils 5 are cooled by heat exchange, and the fan 13 is heated to the outside of the generator G through the cooling air outlet cover 18. Vent the air.

Accordingly, the stator core 3 has a total surface area a2 of cooling air introduced into the generator through the cooling air inlet cover 17 and the stator core 3 along the outer diameter of the stator core 3. The protruding toothed protrusions 32 increase by an increased area d than the surface area a1 of the conventional generator.

At this time, the surface area a2 = a1 + d in contact with the external air of the stator core 3 of the present invention, the increase area d = t × 2n × L (t: protrusion height, n: number of protrusions, L: stator core length )

In addition, the temperature rise of the generator G having the structure of the stator core 3 as described above is inversely proportional to the total surface area a2 of the stator core 3 as shown in Equation 1 below.

Temperature rise ≒ heat dissipation coefficient ≒ (1 / stator core surface area) × K (K is a constant) ---- [Equation 1]

Therefore, the cooling structure of the generator stator core 3 of the present invention forms the protrusion 32 so that the cross section of the structure of the stator core has a toothed shape to maximize the cooling surface area, thereby efficiently cooling the temperature of the generator G. This allows for excellent performance while minimizing size and weight.

In the present invention, the protrusion 32 of the generator stator core is exemplified as a toothed protrusion 32 having a predetermined height such that the cooling air contact surface area is maximized as shown in FIG. 3, but this is a cooling structure of the generator stator core. As just one embodiment of the present invention, any person having ordinary knowledge in the field to which the present invention belongs may perform various modifications of the shape, and the technical spirit of the present invention to the extent.

As described above, the cooling structure of the generator stator core according to the present invention forms a plurality of protrusions along the outer diameter of the stator core to maximize the total surface area of the stator core in contact with the cooling air to improve the cooling efficiency of the generator The performance has the advantage of minimizing the size and weight, thereby reducing the cost by minimizing the installation space of the generator and miniaturization of the equipment required for disassembling and assembling the generator.

Claims (2)

A plurality of yoke portions formed in the inner circumference so that the stator coils are wound; A plurality of protrusions projecting at regular intervals along the outer diameter toward the frame to release heat generated during the power generation process; And Cooling structure of the generator stator core, characterized in that the core body is formed by joining a plurality of layers of thin plates including the plurality of yoke and the protrusion. The method according to claim 1, The protrusions, Cooling structure of the generator stator core, characterized in that it is formed in a cog wheel shape having a height (t) in the range that does not interfere with the flow of magnetic flux flowing through the stator core.