TWI679832B - Motor rotor frame - Google Patents

Abstract

A motor rotor frame includes a first end ring, a second end ring, a plurality of connecting posts, and a plurality of fan blades. The second end ring system is disposed opposite to the first end ring. A plurality of connecting posts are disposed between the first end ring and the second end ring. A plurality of fan blades are respectively disposed on the outer side surfaces of the first end ring and the second end ring at intervals from each other, and each fan blade has an inner end surface, an outer end surface, a first side surface, a second side surface, and a The first cutting bevel is arranged opposite to the outer end and the inner end, and the first and second sides are opposite to each other and extend from the inner end to the outer end respectively. The first cutting bevel is located between the outer end and the first side. Thereby, the thickness between the first side surface and the second side surface is gradually reduced from the boundary between the first side surface and the first cutting inclined surface to the outer end surface.

Description

Motor rotor frame

The invention relates to a motor rotor frame, in particular to a motor rotor frame using a cutting slope provided on a fan blade.

In daily life, motors are the most common electrical equipment that converts electrical energy into kinetic energy. Motors can also be classified according to the direction of the magnetic field, the type of power source, or structural characteristics. The most commonly used motors are mainly induction motors. According to the rotor type, it is divided into an induction motor of a squirrel-cage rotor and an induction motor of a wound rotor. Among them, most of the induction motors adopt a squirrel-cage rotor.

As mentioned above, the structure of the squirrel-cage rotor is mainly composed of a motor rotor frame and an iron core. Please refer to the first diagram. The first diagram is a perspective view of a prior art motor rotor frame. As shown in the figure, a motor rotor frame PA100 includes two end rings PA1 and PA2, a plurality of connecting columns PA3 (only one is shown in the figure) and a plurality of fan blades PA4 (only one is shown in the figure).

The two-terminal rings PA1 and PA2 are disposed correspondingly, and a plurality of connecting columns PA3 are disposed between the two-terminal rings PA1 and PA2 and are respectively connected to the inner sides of the two-terminal rings PA1 and PA2. The plurality of fan blades PA4 are respectively connected to the outer ends of the two-end rings PA1 and PA2 relative to the connecting column PA3.

Please continue to refer to the second figure, which is a schematic plan view showing a prior art motor rotor frame. As shown in the figure, in practice, when the motor rotor frame PA100 rotates in a rotation direction R1, the fan blade PA4 will move around the axis of the motor rotor frame PA100 as the center, and then the fan blade PA4 will The gas is pushed outward to create a centrifugal airflow.

Please refer to the first to third figures together. The third figure is a schematic diagram of the sound power level distribution of the circle A of the first figure and the sound power level test of the fan blade. As shown in the figure, when the motor rotor frame PA100 rotates, the sound power level distribution state of the leeward side of the fan blade PA4 can be obtained by testing the sound power level of the leeward side of the fan blade PA4, among which the density of points It indicates the size of sound power. The greater the density of points, the greater the sound power. The smaller the density of points, the lower the sound power. As can be seen from the third figure, when the fan blade PA4 rotates, noise is generated due to the eddy current formed by the leeward surface of the fan blade PA4.

Considering that in the prior art, when the motor rotor frame rotates, although the fan blades can be moved around the shaft center to generate centrifugal airflow to dissipate heat, the corners of the existing fan blades are too sharp, so it is very difficult to push gas Eddy currents are apt to be formed on the leeward surface, which makes the noise of the motor rotor frame excessively large. Therefore, the main purpose of the present invention is to provide a new motor rotor frame, which can reduce the noise of the motor rotor frame through the improvement of fan blades .

In order to solve the problems of the prior art, the present invention adopts a necessary technical means to provide a motor rotor frame, which includes a first end ring, a second end ring, a plurality of connecting posts, and a plurality of fan blades.

The first end ring system has an outer surface of the first end ring and an inner surface of the first end ring opposite to each other. The second end ring system is opposite to the first end ring and has an outer surface of the second end ring and an inner surface of the second end ring opposite to each other. The inner surface of the second end ring faces the inner surface of the first end ring. A plurality of connecting posts are arranged between the first end ring and the second end ring, and are respectively connected to the inner side surface of the first end ring and the inner side surface of the second end ring. A plurality of fan blades are respectively spaced from the outer surface of the first end ring and the outer surface of the second end ring. Each fan blade has an inner end surface, an outer end surface, a first side surface, a second side surface, and an outer surface. The first cutting slope is arranged opposite to the inner end face, the first side is arranged opposite to the second side, and extends from the inner end face in a radial direction toward the outer end face. The first cutting slope face is located on the outer end face and Between the first side surfaces, the thickness between the first side surface and the second side surface is gradually reduced from the boundary between the first side surface and the first cutting slope to the outer end surface.

In one of the subsidiary technical means derived from the above-mentioned necessary technical means, the first cutting slope extends from the first side surface to the outer end surface in a first tapering direction different from the radial direction, and the radial direction and the first tapering direction There is a first included angle between them, and the first included angle is greater than 10 ° and less than or equal to 60 °.

In one of the subsidiary technical means derived from the above-mentioned necessary technical means, each fan blade further has a second cutting bevel, which is located between the outer end face and the second side face, so that the thickness between the first side face and the second side face can be adjusted from The boundary between the second side surface and the second cutting slope is tapered to the outer end surface.

In one of the subsidiary technical means derived from the above-mentioned necessary technical means, the second cutting inclined plane extends from the second side surface to the outer end surface in a second tapering direction different from the radial direction, and the radial direction and the second tapering direction There is a second included angle between them, and the second included angle is greater than 10 ° and less than or equal to 60 °.

In one of the subsidiary technical means derived from the above-mentioned necessary technical means, the first cutting slope includes a first tapered section and a second tapered section, and the first tapered section is tapered from the first side toward the outer end surface. The second tapered section is tapered from the first tapered section to the outer end surface.

In one of the subsidiary technical means derived from the above-mentioned necessary technical means, each fan blade has a blade length in the axial direction, the first cutting slope has a cutting slope length in the axial direction, and the cutting slope length is shorter than the blade length.

As described above, the motor rotor frame of the present invention utilizes the first cutting inclined surface provided by the fan blade, so that when the motor rotor frame rotates, the first cutting inclined surface can effectively reduce the eddy current, thereby reducing the noise of the fan blade.

The specific embodiments of the present invention will be described in more detail below with reference to the schematic diagrams. The advantages and features of the invention will become clearer from the following description and the scope of the patent application. It should be noted that the drawings are all in a very simplified form and all use inaccurate proportions, which are only used to facilitate and clearly explain the purpose of the embodiments of the present invention.

Please refer to the fourth diagram. The fourth diagram is a schematic perspective view of a motor rotor frame provided by the first preferred embodiment of the present invention. As shown, a motor rotor frame 100 includes a first end ring 1, a second end ring 2, a plurality of connecting posts 3 (only one is shown in the figure), and a plurality of fan blades 4 (only one is shown in the figure). .

The first end ring 1 has a first end ring outer side 11 and a first end ring inner side 12 opposite to each other. The second end ring 2 is opposite to the first end ring 1 and has a second end ring outer side 21 and a second end ring inner side 22 opposite to each other. The second end ring inner side 22 faces the first端 环 内 平面 12。 End ring inner side 12. The plurality of connecting posts 3 are disposed between the first end ring 1 and the second end ring 2 at a distance from each other, and respectively integrally connect the inner surface 12 of the first end ring 12 and the inner surface 22 of the second end ring. In practice, any adjacent two of the plurality of connecting columns 3 will surround a space for accommodating the iron core.

Please continue to refer to the fifth figure, which is an enlarged schematic view of circle B in the fourth figure. As shown in the figure, a plurality of fan blades 4 are spaced from each other and are integrally formed on the outer surface 11 of the first end ring and the outer surface 21 of the second end ring. Each fan blade 4 has an inner end surface 41. , An outer end surface 42, a first side surface 43, a second side surface 44, and a first cutting inclined surface 45. The outer end surface 42 is opposite to the inner end surface 41, the first side surface 43 is opposite to the second side surface 44, and the first side surface 43 and the second side surface 44 are respectively from the inner end surface 41 to the outer end surface 42 in a radial direction D1. Extending, the first cutting bevel 45 is located between the outer end face 42 and the first side face 43 so that a thickness T between the first side face 43 and the second side face 44 intersects from the first side face 43 and one of the first cutting bevel face 45 The position BW is tapered to the outer end face 42. In addition, the first cutting inclined surface 45 extends from the first side surface 43 to the outer end surface 42 in a first tapering direction (not shown) different from the radial direction D1, and between the radial D1 and the first tapering direction The first included angle a1 is greater than 10 ° and less than or equal to 60 °.

As mentioned above, in this embodiment, the first end ring 1, the second end ring 2, the connecting post 3, and the fan blade 4 are integrally formed. The material is, for example, aluminum. In practice, for example, aluminum paste is used. Pour into the rotor slot where the iron core is placed in advance, and then combine with the iron core to form a squirrel-cage rotor.

Please continue to refer to the sixth figure. The sixth figure is a schematic diagram of the sound power level distribution of the fan blade in the fifth figure for the sound power level test. As shown in the figure, in this embodiment, the first included angle a1 is 15 °, and the sound power distribution of the sixth figure is to rotate the motor rotor frame 100 toward the second side 44 and to the first side 43 of the fan blade 4 Acoustic power level (acoustic power level) test obtained from the leeward side sound power level distribution, where the first side 43 is the density of points to represent the size of the sound power, the greater the point density, the greater the sound power , The smaller the density of points, the smaller the sound power. Therefore, referring to the sixth figure and the third figure, it can be known that the fan rotor 4 is provided with a first cutting slope 45 on the fan rotor 4 according to the motor rotor frame 100 of the present invention. When the first side 43 and the first cutting slope 45 serve as On the leeward side, the fan blades 4 can indeed reduce the direct impact of the eddy current on the fan blades 4 due to the existence of the first cutting inclined surface 45, thereby reducing the noise generated when the motor rotor frame 100 rotates.

Please refer to the following Table 1. Table 1 is a comparison table of the sound power level test performed by the present invention to adjust the angle of the first included angle a1 of the fan blade 4 and the prior art fan blade PA4:
First angle (°) 0 10 15 20 30 40 50 60 Average sound pressure (dB) 64.7 63.3 63.6 64.3 64.2 64.3 64.2 64.6

As shown in Table 1 above, the first included angle a1 of this embodiment is 15 °, and its average sound pressure is 63.6 dB. Compared to the first included angle a1 of 0 ° (that is, the prior art fan blade PA4), it can indeed effectively Decrease the average sound pressure, and the average sound pressure measured by the first included angle a1 between 10 ° and 60 ° has a significant decrease.

Please continue to refer to the seventh figure, which is an enlarged schematic diagram of a fan blade of a motor rotor frame provided by a second preferred embodiment of the present invention. As shown in the figure, the present invention further provides a motor rotor frame 100a. The difference between the motor rotor frame 100a and the first preferred embodiment is that the motor rotor frame 100a is replaced by a fan blade 4a.

The fan blade 4a also has an inner end surface 41a, an outer end surface 42a, a first side surface 43a, a second side surface 44a, and a first cutting inclined surface 45a. However, the fan blade 4a has a blade length h1 in the axial direction X, and the first cutting inclined surface 45a has a cutting bevel length h2 in the axial direction X, wherein the cutting inclined surface length h2 is smaller than the first cutting inclined surface 45a.

In this embodiment, although the cutting bevel length h2 of the first cutting bevel 45a is shorter than the blade length h1, the eddy current on the leeward surface can still be reduced, thereby reducing the generation of noise. In other words, the first preferred It can be known from the embodiment that when the fan blade 4 rotates along the second side surface 44, the eddy current formed on the leeward surface of the fan blade 4 can reduce the impact on the fan blade 4 due to the existence of the first cutting inclined surface 45. The fan blade 4a of the embodiment can also reduce the impact of the eddy current on the leeward of the fan blade 4a and the fan blade 4a through the existence of the first cutting inclined surface 45a, thereby reducing the generation of noise, but the reduction will be due to the length of the cutting inclined surface The difference between h2 and the blade length h1 is reduced, that is, the closer the cutting bevel length h2 is to the blade length h1, the better. The first embodiment (the cutting bevel length h2 is equal to the blade length h1) is particularly preferred.

Please refer to FIG. 8, which is an enlarged schematic diagram of a fan blade of a motor rotor frame provided by a third preferred embodiment of the present invention. As shown in the figure, the present invention further provides a motor rotor frame 100b. The difference between the motor rotor frame 100b and the first preferred embodiment is that the motor rotor frame 100b is replaced with a fan blade 4b.

The fan blade 4b also has an inner end surface 41b, an outer end surface 42b, a first side surface 43b, a second side surface 44b, and a first cutting slope (not shown), but the first cutting slope further includes a first gradient The reduced section 451b and a second tapered section 452b. The first tapered section 451b is tapered from the first side face 43b toward the outer end face 42b, and the second tapered section 452b is tapered from the first tapered section 451b to the outer face 42b. Among them, since the first tapered section 451b and the second tapered section 452b of different angles are provided on the first side surface 43b of the fan blade 4b in this embodiment, the eddy current can also be reduced to face the fan on the leeward side of the fan blade 4b. The impact caused by the blade 4b reduces the generation of noise.

Please refer to the ninth figure, which is an enlarged schematic diagram of a fan blade of a motor rotor frame provided by a fourth preferred embodiment of the present invention. As shown in the figure, the present invention further provides a motor rotor frame 100c. The difference between the motor rotor frame 100c and the first preferred embodiment is that the motor rotor frame 100c is replaced with a fan blade 4c by a fan blade 4c.

The fan blade 4c also has an inner end surface 41c, an outer end surface 42c, a first side surface 43c, a second side surface 44c, and a first cutting inclined surface 45c. However, the fan blade 4c further includes a second cutting surface. The inclined surface 46c and the second cutting inclined surface 46c are located between the outer end surface 42 and the second side surface 44c. Therefore, when the fan blade 4c rotates along the first side surface 43c, the second cutting inclined surface 46c can be used to reduce the eddy current on the fan blade. When the fan blade 4c rotates along the second side surface 44c, the impact of the vortex on the fan blade 4c can be reduced through the first cutting inclined surface 45c as described in the first preferred embodiment. In other words, in this embodiment, since the motor rotor frame 100c is provided with the first cutting inclined surface 45c and the second cutting inclined surface 46c on both sides of the fan blade 4c, the motor rotor frame 100c can be rotated in any direction. The noise is effectively reduced through the first cutting bevel 45c or the second cutting bevel 46c.

In summary, compared with the existing fan blades of the motor rotor frame, when the fan blades are rotating, it is easy to generate noise because the eddy current formed on the leeward side has an excessive impact on the fan blades. Because the motor rotor frame of the present invention is There is a first cutting slope, so when the motor rotor frame rotates, it can effectively reduce the impact of the vortex on the fan blades through the first cutting slope, thereby reducing the generation of noise.

With the above detailed description of the preferred embodiments, it is hoped that the features and spirit of the present invention can be more clearly described, and the scope of the present invention is not limited by the preferred embodiments disclosed above. On the contrary, the intention is to cover various changes and equivalent arrangements within the scope of the patents to be applied for in the present invention.

PA100‧‧‧Motor rotor frame

PA1, PA2‧‧‧End ring

PA3‧‧‧Connecting Post

PA4‧‧‧fan blade

100, 100a, 100b, 100c‧‧‧ Motor rotor frame

1‧‧‧ the first end ring

11‧‧‧ outside of the first end ring

12‧‧‧ inside side of the first end ring

2‧‧‧Second end ring

21‧‧‧ the outer side of the second end ring

22‧‧‧Inner side of the second end ring

3‧‧‧ connecting post

4, 4a, 4b, 4c ‧‧‧fan blades

41, 41a, 41b, 41c

42, 42a, 42b, 42c

43, 43a, 43b, 43c‧‧‧ First side

44, 44a, 44b, 44c‧‧‧ Second side

45, 45a, 45c‧‧‧‧First cutting bevel

451b‧‧‧First tapered section

452b‧‧‧Second tapered section

46c‧‧‧Second Cutting Bevel

T‧‧‧thickness

BW‧‧‧ Junction

X‧‧‧ axial

D1‧‧‧ Radial

a1‧‧‧First angle

h1‧‧‧ blade length

h2‧‧‧Cutting bevel length

R1‧‧‧Rotation direction

The first figure is a schematic perspective view showing a prior art motor rotor frame;
The second figure is a schematic plan view showing a prior art motor rotor frame;
The third figure is a schematic diagram of the sound power level distribution in which the circle A in the first figure is enlarged and the fan blades are tested for the sound power level;
The fourth diagram is a schematic perspective view showing a motor rotor frame provided by the first preferred embodiment of the present invention;
The fifth diagram is an enlarged schematic diagram of circle B in the fourth diagram;
The sixth diagram is a schematic diagram of the sound power level distribution of the sound power level test of the fan blades in the fifth diagram;
The seventh diagram is an enlarged schematic diagram of a fan blade of a motor rotor frame provided by a second preferred embodiment of the present invention;
The eighth diagram is an enlarged schematic diagram of a fan blade of a motor rotor frame provided by a third preferred embodiment of the present invention; and the ninth diagram is an enlarged schematic diagram of a fan blade of a motor rotor frame provided by a fourth preferred embodiment of the present invention .

Claims (6)

A motor rotor frame includes:
A first end ring having an outer surface of the first end ring and an inner surface of the first end ring opposite to each other;
A second end ring is disposed opposite to the first end ring and has an outer side surface of the second end ring and an inner side surface of the second end ring opposite to each other. The inner side surface of the second end ring faces the first end ring. Inside face of end ring
A plurality of connecting posts are disposed between the first end ring and the second end ring, and respectively connect the inner surface of the first end ring and the inner surface of the second end ring; and a plurality of fan blades are connected to each other The fan blades have an inner end surface, an outer end surface, a first side surface, a second side surface, and a first cutting edge. A bevel, the outer end surface is disposed opposite to the inner end surface, the first side surface is disposed opposite to the second side surface, and each extends from the inner end surface in a radial direction toward the outer end surface. The first cutting bevel system is It is located between the outer end surface and the first side surface, so that the thickness between the first side surface and the second side surface is gradually reduced from the boundary between the first side surface and the first cutting slope to the outer end surface. The motor rotor frame according to item 1 of the scope of patent application, wherein the first cutting inclined plane extends from the first side surface to the outer end surface in a first tapering direction different from the radial direction, and the diameter There is a first included angle between the direction and the first tapered direction, and the first included angle is greater than 10 ° and less than or equal to 60 °. The motor rotor frame according to item 1 of the scope of patent application, wherein each of the fan blades further has a second cutting bevel, which is located between the outer end face and the second side face, so that the first side face and the The thickness between the second side surfaces gradually decreases from the boundary between the second side surface and the second cutting slope to the outer end surface. The motor rotor frame according to item 3 of the scope of patent application, wherein the second cutting inclined plane extends from the second side surface to the outer end surface in a second tapering direction different from the radial direction, and the diameter There is a second included angle between the direction and the second tapered direction, and the second included angle is greater than 10 ° and less than or equal to 60 °. The motor rotor frame according to item 1 of the scope of patent application, wherein the first cutting slope includes a first tapered section and a second tapered section, and the first tapered section faces from the first side toward the The outer end surface is tapered, and the second tapered section is tapered from the first tapered section to the outer end surface. The motor rotor frame according to item 1 of the scope of patent application, wherein each of the fan blades has a blade length along an axial direction, the first cutting slope has a cutting slope length along the axial direction, and the cutting slope length Is less than the blade length.