CN111740521A

CN111740521A - Motor rotor frame

Info

Publication number: CN111740521A
Application number: CN201910228268.3A
Authority: CN
Inventors: 彭奂森; 赖逢祥
Original assignee: Teco Electric and Machinery Co Ltd
Current assignee: Teco Electric and Machinery Co Ltd
Priority date: 2019-03-25
Filing date: 2019-03-25
Publication date: 2020-10-02

Abstract

The invention provides a motor rotor frame which comprises a first end ring, a second end ring, a plurality of connecting columns and a plurality of fan blades. The second end ring is disposed opposite the first end ring. A plurality of connecting posts are disposed between the first end ring and the second end ring. The fan blades are arranged on the outer side surfaces of the first end ring and the second end ring at intervals, each fan blade is provided with an inner end surface, an outer end surface, a first side surface, a second side surface and a first cutting inclined surface, the outer end surfaces and the inner end surfaces are arranged in a reverse mode, the first side surfaces and the second side surfaces are arranged in a reverse mode and extend from the inner end surfaces along the outward end surfaces, the first cutting inclined surfaces are located between the outer end surfaces and the first side surfaces, and therefore the thickness between the first side surfaces and the second side surfaces is gradually reduced from the junction of the first side surfaces and the first cutting inclined surfaces to the outer end surfaces.

Description

Motor rotor frame

Technical Field

The present invention relates to a motor rotor frame, and more particularly, to a motor rotor frame having cutting slopes on fan blades.

Background

In daily life, the most common electric devices using electric energy to convert into kinetic energy are motors, which can be classified according to the magnetic field direction, the type of power source or the structural characteristics, and the most commonly used motors are mainly induction motors, but the induction motors can be classified into induction motors with a squirrel-cage rotor and induction motors with a wound-rotor according to the type of rotor, wherein the induction motors mostly adopt the squirrel-cage rotor.

In summary, the structure of the squirrel-cage rotor is mainly composed of a motor rotor frame and an iron core. Referring to fig. 1, fig. 1 is a perspective view illustrating a rotor frame of a motor in the prior art. As shown, a motor rotor frame PA100 includes two end rings PA1 and PA2, a plurality of connecting columns PA3 (only one is shown), and a plurality of fan blades PA4 (only one is shown).

The two-end ring PA1 and the PA2 are disposed correspondingly, and the connecting posts PA3 are disposed between the two-end ring PA1 and the PA2 and connected to the inner sides of the two-end ring PA1 and the PA2, respectively. The fan blades PA4 are connected to the outer sides of the two end rings PA1 and PA2 respectively opposite to the connecting column PA 3.

Referring to fig. 2, fig. 2 is a schematic plan view illustrating a rotor frame of a motor in the prior art. As shown, in practice, when the motor rotor frame PA100 rotates along a rotation direction R1, the fan blades PA4 move around the axis of the motor rotor frame PA100, and further push the air between each two fan blades PA4 outwards to generate a centrifugal airflow.

Referring to fig. 1 to 3 together, fig. 3 is a schematic diagram of the sound power level distribution of the fan blade subjected to the sound power level test and amplified by circle a in fig. 1. As shown, the acoustic power level distribution of the leeward side of fan blade PA4, which is obtained by subjecting the leeward side of fan blade PA4 to an acoustic power level test as motor rotor frame PA100 rotates, is where the concentration of dots is a magnitude representing the acoustic power, and the greater the concentration of dots, the greater the acoustic power, and the smaller the concentration of dots, the smaller the acoustic power. As can be seen from fig. 3, when the fan blade PA4 rotates, noise is generated due to the vortex formed by the leeward side of the fan blade PA 4.

Disclosure of Invention

In view of the fact that in the prior art, when the motor rotor frame rotates, although the fan blades can move around the axis to generate centrifugal airflow for heat dissipation, because the corners of the existing fan blades are too sharp, vortex is easily formed on the leeward surface when the air is pushed, and the noise when the motor rotor frame rotates is too loud; accordingly, the present invention is directed to a new motor rotor frame, which can reduce the noise generated when the motor rotor frame rotates by improving the fan blades.

The present invention is directed to solving the problems of the prior art, and a necessary technical means is to provide a motor rotor frame, which includes a first end ring, a second end ring, a plurality of connecting columns, and a plurality of fan blades.

The first end ring has a first end ring outer side surface and a first end ring inner side surface which are opposite to each other. The second end ring is disposed opposite the first end ring and has a second end ring outer side surface and a second end ring inner side surface that are opposite to each other, the second end ring inner side surface facing the first end ring inner side surface. The connecting columns are arranged between the first end ring and the second end ring and are respectively connected with the inner side surface of the first end ring and the inner side surface of the second end ring. The fan blades are arranged on the outer side surface of the first end ring and the outer side surface of the second end ring at intervals, each fan blade is provided with an inner end surface, an outer end surface, a first side surface, a second side surface and a first cutting inclined surface, the outer end surface and the inner end surface are arranged in a reverse mode, the first side surface and the second side surface are arranged in a reverse mode and extend from the inner end surface to the outer end surface in a radial direction, and the first cutting inclined surface 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 junction of the first side surface and the first cutting inclined surface to the outer.

In an auxiliary technical means derived from the above-mentioned essential technical means, the first cutting bevel extends from the first side surface to the outer end surface along a first tapering direction different from the radial direction, and a first included angle is formed between the radial direction and the first tapering direction, and the first included angle is greater than 10 ° and less than or equal to 60 °.

In an auxiliary technical means derived from the above-mentioned necessary technical means, each fan blade further has a second cutting inclined surface located between the outer end surface and the second side surface, so that the thickness between the first side surface and the second side surface is gradually reduced from the junction of the second side surface and the second cutting inclined surface to the outer end surface.

In an auxiliary technical means derived from the above-mentioned essential technical means, the second cutting inclined surface extends from the second side surface to the outer end surface along a second tapering direction different from the radial direction, and a second included angle is formed between the radial direction and the second tapering direction, and the second included angle is greater than 10 ° and less than or equal to 60 °.

In an auxiliary technical means derived from the above-mentioned essential technical means, the first cutting inclined plane includes a first tapering section and a second tapering section, the first tapering section tapers from the first side surface towards the outer end surface, and the second tapering section tapers from the first tapering section to the outer end surface.

In a subsidiary aspect derived from the above-described essential aspect, each fan blade has a blade length in the axial direction, and the first cutting chamfer has a cutting chamfer length in the axial direction, the cutting chamfer length being less than the blade length.

As described above, the motor rotor frame of the present invention utilizes the first cutting bevel surface disposed on the fan blade, so that when the motor rotor frame rotates, the first cutting bevel surface can effectively reduce the eddy current, and further reduce the noise of the fan blade.

Drawings

FIG. 1 is a perspective view showing a prior art motor rotor frame;

FIG. 2 is a schematic plan view showing a prior art motor rotor frame;

FIG. 3 is an acoustic power level distribution plot of the fan blade subjected to acoustic power level testing, amplified by circle A of FIG. 1;

FIG. 4 is a perspective view of a rotor frame of a motor according to a first preferred embodiment of the present invention;

FIG. 5 is an enlarged view of circle B of FIG. 4;

FIG. 6 is a graphical illustration of the acoustic power level distribution of the fan blade of FIG. 5 tested for acoustic power level;

FIG. 7 is an enlarged view of a fan blade of a rotor frame of a motor according to a second preferred embodiment of the present invention;

FIG. 8 is an enlarged view of a fan blade of a rotor frame of a motor according to a third preferred embodiment of the present invention; and

fig. 9 is an enlarged view of a fan blade of a rotor frame of a motor according to a fourth preferred embodiment of the present invention.

Description of the reference numerals

PA 100: motor rotor frame

PA1, PA 2: end ring

PA 3: connecting column

PA 4: fan blade

100. 100a, 100b, 100 c: motor rotor frame

1: first end ring

11: outer side of the first end ring

12: inner side surface of the first end ring

2: second end ring

21: outer side surface of the second end ring

22: inner side surface of the second end ring

3: connecting column

4. 4a, 4b, 4 c: fan blade

41. 41a, 41b, 41 c: inner end surface

42. 42a, 42b, 42 c: outer end face

43. 43a, 43b, 43 c: first side surface

44. 44a, 44b, 44 c: second side surface

45. 45a, 45 c: first cutting bevel

451 b: first tapered section

452 b: second tapered section

46 c: second cutting bevel

T: thickness of

BW: junction point

X: axial direction

D1: radial direction

a 1: first included angle

h 1: blade length

h 2: length of cutting bevel

R1: direction of rotation

Detailed Description

The following describes in more detail embodiments of the present invention with reference to the schematic drawings. Advantages and features of the present invention will become apparent from the following description and claims. It is to be noted that the drawings are in a very simplified form and are not to precise scale, which is merely for the purpose of facilitating and distinctly claiming the embodiments of the present invention.

Referring to fig. 4, fig. 4 is a perspective view illustrating a rotor frame of a motor according to a 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 shown), and a plurality of fan blades 4 (only one shown).

The first end ring 1 has a first end ring outer side surface 11 and a first end ring inner side surface 12 which are opposite to each other. The second end ring 2 is disposed opposite to the first end ring 1 and has a second end ring outer side surface 21 and a second end ring inner side surface 22 which are opposite to each other, and the second end ring inner side surface 22 faces the first end ring inner side surface 12. The connecting columns 3 are disposed between the first end ring 1 and the second end ring 2 at intervals, and respectively integrally connect the first end ring inner side surface 12 and the second end ring inner side surface 22. In practice, any two adjacent connecting posts 3 form a space for accommodating the iron core.

Referring to fig. 5, fig. 5 is an enlarged schematic view of circle B of fig. 4. As shown in the figure, the fan blades 4 are respectively disposed on the first end ring outer side surface 11 and the second end ring outer side surface 21 in an integrally forming manner at intervals, and 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 and the inner end surface 41 are oppositely arranged, the first side surface 43 and the second side surface 44 respectively extend from the inner end surface 41 to the outer end surface 42 along a radial direction D1, and the first cutting inclined surface 45 is located between the outer end surface 42 and the first side surface 43, so that a thickness T between the first side surface 43 and the second side surface 44 is gradually reduced from a junction BW of the first side surface 43 and the first cutting inclined surface 45 to the outer end surface 42. In addition, the first cutting bevel 45 extends from the first side surface 43 to the outer end surface 42 along a first tapering direction (not shown) different from the radial direction D1, and a first included angle a1 is formed between the radial direction D1 and the first tapering direction, and the first included angle a1 is greater than 10 ° and less than or equal to 60 °.

As mentioned above, in the present embodiment, the first end ring 1, the second end ring 2, the connecting column 3 and the fan blades 4 are integrally formed, and the material of the first end ring, the second end ring, the connecting column 3 and the fan blades 4 is, for example, aluminum.

Continuing with fig. 6, fig. 6 is a schematic view of the sound power level distribution of the fan blade of fig. 5 for sound power level test. As shown, in the present embodiment, the first included angle a1 is 15 °, and the sound power distribution of fig. 6 is a leeward side sound power level distribution obtained by rotating the motor rotor frame 100 toward the second side surface 44 and performing a sound power level (Acoustic power level) test on the first side surfaces 43 of the fan blades 4, wherein the first side surfaces 43 represent the sound power by the density of points, and the larger the density of points, the larger the sound power, the smaller the density of points, the smaller the sound power. Accordingly, referring to fig. 6 and fig. 3 together, it can be seen that, according to the motor rotor frame 100 of the present invention, the fan blades 4 are provided with the first cutting inclined surface 45, and when the first side surface 43 and the first cutting inclined surface 45 are used as the leeward side, the fan blades 4 can actually reduce the direct impact of the vortex on the fan blades 4 due to the presence of the first cutting inclined surface 45, so as to reduce the noise generated when the motor rotor frame 100 rotates.

Please refer to the following table one, which is a comparison table of the angle of the first included angle a1 of the fan blade 4 adjusted according to the present invention and the sound power level test of the fan blade PA4 of the prior art:

first included 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 the above table, the first angle a1 of the present embodiment is 15 °, and the average sound pressure thereof is 63.6dB, which is 0 ° compared to the first angle a1 (i.e. the fan blade PA4 of the prior art), and the average sound pressure measured at the first angle a1 is significantly reduced between 10 ° and 60 °.

Referring to fig. 7, fig. 7 is an enlarged schematic view of a fan blade of a rotor frame of a motor according to a second preferred embodiment of the invention. As shown in the drawings, the present invention further provides a motor rotor frame 100a, and the motor rotor frame 100a is different from the first preferred embodiment only in that the motor rotor frame 100a replaces the fan blades 4 with fan blades 4 a.

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 bevel 45 a. However, the fan blade 4a has a blade length h1 in the axial direction X, and the first cutting chamfer 45a has a cutting chamfer length h2 in the axial direction X; wherein the cutting chamfer length h2 is less than the first cutting chamfer 45 a.

In the present embodiment, although the cutting chamfer length h2 of the first cutting chamfer 45a is smaller than the blade length h1, the vortex flow of the leeward side can be reduced, further reducing the noise generation, in other words, as can be seen from the first preferred embodiment, when the fan blades 4 rotate along the second side surface 44, the vortex formed at the leeward side of the fan blade 4 may reduce the impact on the fan blade 4 due to the presence of the first cut bevel 45, therefore, the fan blade 4a of the present embodiment can also reduce the impact of the vortex on the fan blade 4a caused by the leeward side of the fan blade 4a due to the existence of the first cut-off slope 45a, the noise generation is reduced only by the difference between the cutting ramp length h2 and the blade length h1, i.e. the cutting ramp length h2 is preferably closer to the blade length h1, wherein the first embodiment (cutting ramp length h2 equals blade length h1) is particularly preferred.

Referring to fig. 8, fig. 8 is an enlarged schematic view of a fan blade of a motor rotor frame according to a third preferred embodiment of the invention. As shown in the drawings, the present invention further provides a motor rotor frame 100b, and the motor rotor frame 100b is different from the first preferred embodiment only in that the motor rotor frame 100b replaces the fan blades 4 with fan blades 4 b.

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 bevel (not shown), but the first cutting bevel further includes a first tapered section 451b and a second tapered section 452 b. The first tapered section 451b tapers from the first side surface 43b toward the outer end surface 42b, and the second tapered section 452b tapers from the first tapered section 451b to the outer end surface 42 b. In the embodiment, because the first tapered section 451b and the second tapered section 452b with different angles are arranged on the first side surface 43b of the fan blade 4b, the impact of the vortex on the fan blade 4b caused by the leeward side of the fan blade 4b can be reduced, and the noise generation is further reduced.

Referring to fig. 9, fig. 9 is an enlarged schematic view of a fan blade of a rotor frame of a motor according to a fourth preferred embodiment of the invention. As shown, the present invention further provides a motor rotor frame 100c, and the motor rotor frame 100c is different from the first preferred embodiment only in that the motor rotor frame 100c replaces the fan blades 4 with fan blades 4 c.

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 bevel 45c, but in addition, the fan blade 4c further includes a second cutting bevel 46c, and the second cutting bevel 46c is located between the outer end surface 42 and the second side surface 44c, so that when the fan blade 4c rotates along the first side surface 43c, the impact of the vortex on the fan blade 4c can be reduced by the second cutting bevel 46c, and 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 by the first cutting bevel 45c as described in the first preferred embodiment. In other words, in the present 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 noise can be effectively reduced by the first cutting inclined surface 45c or the second cutting inclined surface 46c regardless of which direction the motor rotor frame 100c rotates.

In summary, compared with the prior art that when the fan blades of the motor rotor frame rotate, the fan blades are easily subjected to excessive impact caused by the vortex formed on the leeward side, so that noise is generated.

The foregoing detailed description of the preferred embodiments is intended to more clearly illustrate the features and spirit of the present invention, and not to limit the scope of the invention by the preferred embodiments disclosed above. On the contrary, it is intended to cover various modifications and equivalent arrangements included within the scope of the appended claims.

Claims

1. A motor rotor frame, comprising:

a first end ring having a first end ring outer side surface and a first end ring inner side surface that are opposite to each other;

a second end ring disposed opposite the first end ring and having a second end ring outer side surface and a second end ring inner side surface that are opposite to each other, the second end ring inner side surface facing the first end ring inner side surface;

a plurality of connecting columns disposed between the first end ring and the second end ring and respectively connecting an inner side surface of the first end ring and an inner side surface of the second end ring; and

the fan blades are arranged on the outer side surface of the first end ring and the outer side surface of the second end ring at intervals, each fan blade is provided with an inner end surface, an outer end surface, a first side surface, a second side surface and a first cutting inclined surface, the outer end surface and the inner end surface are arranged in a reverse mode, the first side surface and the second side surface are arranged in a reverse mode and extend from the inner end surface to the outer end surface in a radial direction, and the first cutting inclined surface 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 gradually decreases from the junction of the first side surface and the first cutting inclined surface to the outer end surface.

2. The motor rotor frame according to claim 1, wherein the first cutting chamfer extends from the first side surface to the outer end surface along a first tapering direction different from the radial direction, and the radial direction and the first tapering direction have a first included angle therebetween, the first included angle being greater than 10 ° and equal to or less than 60 °.

3. The motor rotor frame of claim 1, wherein each of the plurality of fan blades further has a second cutting chamfer located between the outer end face and the second side face, such that a thickness between the first side face and the second side face tapers from a junction of the second side face and the second cutting chamfer to the outer end face.

4. The motor rotor frame according to claim 3, wherein the second cutting chamfer extends from the second side surface to the outer end surface along a second tapering direction different from the radial direction, and the radial direction and the second tapering direction have a second included angle therebetween, the second included angle being greater than 10 ° and equal to or less than 60 °.

5. The motor rotor frame of claim 1, wherein the first cutting chamfer includes a first tapered segment that tapers from the first side face toward the outer end face and a second tapered segment that tapers from the first tapered segment to the outer end face.

6. The motor rotor frame of claim 1, wherein each of the plurality of fan blades has a blade length in an axial direction, the first cutting chamfer has a cutting chamfer length in the axial direction, the cutting chamfer length being less than the blade length.