Cast copper squirrel cage rotor of motor

Abstract

The utility model discloses a motor copper casting squirrel cage rotor comprising an end ring, the upper end of the end ring is provided with a plurality of mutually stacked silicon steel sheets, the center of each silicon steel sheet is provided with a through hole, the through hole is internally provided with two symmetrical gaps, the outer wall of each silicon steel sheet is provided with a plurality of spacing bars along the circumference, and the through holes of the plurality of silicon steel sheets form a channel. A plurality of protruding blocks are arranged at the lower end of the end ring along the circumference of the end ring, a plurality of conductive ribs are arranged at the upper end of the end ring along the circumference of the end ring, the conductive ribs are inserted into the intervals of the spacing strips, and protruding strips corresponding to the notches in the through hole are symmetrically arranged on the outer wall of the rotating shaft. The outer walls of the rotating shafts are provided with air channels located between every two protruding strips, the ends, close to the end rings, of the air channels are provided with air inlet notches respectively, the height of the protruding strips is larger than the total height of the stacked rotating shafts, and the trapezoidal protruding blocks are arranged at the lower ends of the end rings, so that when the rotor rotates, the protruding blocks play a role of fan blades, generate wind power and dissipate heat of the rotor.

Description

Technical Field

[0001] The utility model relates to the technical field of squirrel cage rotors, in particular to a cast copper squirrel cage rotor for a motor. Background Art

[0002] The squirrel cage rotor of a traditional asynchronous motor includes a rotor core, conductive bars embedded in the rotor core, and end rings installed on the end faces of the rotor core. The end rings are connected to the conductive bars and are provided with cooling fans. Since asynchronous motors require higher motor energy efficiency, the stator-rotor air gap is often small during design and theoretical calculations. When the motor operates normally, the stator winding and the rotor end rings will generate a large amount of heat, which will have a certain impact on the normal operation and life of the motor. In order to remove this excess heat from the inside of the motor, a cooling fan is usually added to the rotor end ring to reduce the heat at the end of the stator winding. However, due to the relatively compact internal structure of the motor, the above-mentioned added heat dissipation method only acts on the local surface of the stator winding, and no air flow can be formed inside the motor, resulting in poor heat dissipation effect. Utility Model Content

[0003] In view of the above problems, the utility model provides a cast copper squirrel cage rotor for a motor, which solves the above problems.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a cast copper squirrel cage rotor for a motor, comprising an end ring, wherein a plurality of stacked silicon steel sheets are provided at the upper end of the end ring, a through hole is provided in the center of the silicon steel sheet, two symmetrical notches are provided in the through hole, a plurality of spacer bars are provided along the circumference of the outer wall of the silicon steel sheet, the plurality of through holes in the silicon steel sheets form a channel, a rotating shaft is provided in the channel, and gaps are provided between each pair of the spacer bars, and the gaps are sword-shaped;

[0005] The lower end of the end ring is provided with a plurality of protrusions along its circumference, and the upper end of the end ring is provided with a plurality of conductive ribs along its circumference, and the conductive ribs are inserted into the gaps between the spacer bars;

[0006] The outer wall of the rotating shaft is symmetrically provided with protrusions corresponding to the notches in the through hole. The outer wall of the rotating shaft is provided with air ducts located between the protrusions. The air ducts are respectively provided with air inlet notches at one end close to the end ring. The height of the protrusions is greater than the total height of multiple stacked rotating shafts.

[0007] Preferably, the cross section of the end ring is an isosceles trapezoid, the section of the protrusion is an isosceles trapezoid, and a plurality of the protrusions are evenly distributed on the end ring along the circumference of the end ring.

[0008] Preferably, the end ring, the protrusion and the conductive rib are integrally formed by a die-casting process.

[0009] Preferably, the spacer bars are T-shaped, and no two of the spacer bars touch each other.

[0010] Preferably, the air duct on the outer wall of the rotating shaft is S-shaped, and the rotating shaft is interference fit with the silicon steel sheet.

[0011] Preferably, the conductive ribs are fixed in the gaps between the spacer bars by a die-casting process, and an insulating layer is provided on the surface of the silicon steel sheet.

[0012] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0013] 1. By arranging a trapezoidal protrusion at the lower end of the end ring, when the rotor rotates, the protrusion acts as a fan blade to generate wind force and dissipate heat for the rotor. At the same time, the protrusion is polished and cut to serve as the dynamic balance weight and adjustment of the rotor. By forming the end ring, the protrusion and the conductive rib into one piece by a die-casting process, during the processing, the surface is smoother and has higher dimensional consistency, while ensuring the firmness of the connection between the end ring, the protrusion and the conductive rib.

[0014] 2. The rotation of the rotor generates wind through the convex blocks, and the generated wind enters the air duct through the air inlet gap, taking away the heat generated by the rotor. The air duct is set to be S-shaped, which increases the flow time of the cold air in the air duct and allows it to take away more heat. By setting the height of the convex strips to be greater than the total height of multiple stacked shafts, part of the convex strips are exposed on the outside of the shaft. When the rotor rotates at high speed, the exposed convex strips will generate wind to generate negative pressure at the end away from the end ring, accelerating the flow rate of the wind in the air duct, and then making the cold air flow quickly in the air duct, achieving the effect of rapid heat dissipation of the rotor. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0016] Figure 2 This is a partial cross-sectional schematic diagram of the end ring of the utility model;

[0017] Figure 3 This is a schematic diagram of a silicon steel sheet of the present utility model;

[0018] Figure 4 This is a schematic diagram of the utility model without a rotating shaft;

[0019] Figure 5 It is a schematic diagram of the rotating shaft of the present utility model.

[0020] Explanations in the figure: 1. End ring; 2. Rotating shaft; 3. Silicon steel sheet; 11. Bump; 12. Conductive rib; 21. Raised strip; 22. Air duct; 23. Air inlet notch; 31. Through hole; 32. Spacer. DETAILED DESCRIPTION

[0021] The following embodiments of the present invention are described in further detail with reference to the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0022] See also Figure 1 、 Figure 2 and Figure 3 A cast copper squirrel cage rotor for a motor includes an end ring 1. A plurality of stacked silicon steel sheets 3 are provided on the upper end of the end ring 1. An insulating layer is provided on the surface of the silicon steel sheet 3. The insulating layer provided on the surface of the silicon steel sheet 3 effectively prevents the occurrence of conductive phenomena, increases the resistance value of the conductive rib 12, reduces eddy current loss, and prevents the rotor from melting at high temperature due to excessive eddy current loss. A through hole 31 is provided in the center of the silicon steel sheet 3. Two symmetrical notches are provided in the through hole 31. The through hole 31 facilitates the passage of the rotating shaft 2. The notch of the through hole 31 corresponds to the ridge 21, which plays a role in positioning the silicon steel sheet 3, ensuring that the silicon steel sheets 3 are aligned when stacked. At the same time, the ridge 21 and the through hole are aligned. The notch of 31 is engaged to prevent the shaft 2 and the silicon steel sheet 3 from rotating relative to each other when the rotor rotates at high speed. The outer wall of the silicon steel sheet 3 is provided with a plurality of spacer bars 32 along its circumference. The through holes 31 of the plurality of silicon steel sheets 3 form a channel. The shaft 2 is arranged in the channel. Gaps are provided between the spacer bars 32 and the gaps are sword-shaped. The spacer bars 32 are T-shaped. The spacer bars 32 do not contact each other. When the conductive ribs 12 are die-cast in the sword-shaped gaps between the spacer bars 32, it can be intuitively observed through the gaps between the spacer bars 32 whether there are thin bars or broken bars of the conductive ribs 12, so as to facilitate the determination of whether the rotor meets the standards.

[0023] See also Figure 1 、 Figure 2 and Figure 4The lower end of the end ring 1 is provided with a plurality of protrusions 11 along its circumference. The end ring 1 connects the conductive ribs 12 to ensure that the current flows in the conductive ribs 12. At the same time, it has good electrical and thermal conductivity, high strength and resistance to high-temperature softening. It remains stable under high-speed rotation and will not move or deform due to centrifugal force. By arranging a trapezoidal protrusion 11 at the lower end of the end ring 1, when the rotor rotates, the protrusion 11 acts as a fan blade, generates wind force, and dissipates heat for the rotor. At the same time, the protrusion 11 is ground and cut to serve as the dynamic balancing weight and adjustment of the rotor. The upper end of the end ring 1 is provided with a plurality of conductive ribs 12 along its circumference. The conductive ribs 12 are inserted into the gaps between the spacer bars 32. The conductive ribs 12 generate current through the principle of electromagnetic induction. , and then it is affected by the electromagnetic force to form eddy currents, which in turn drives the motor to rotate. The cross-section of the end ring 1 is an isosceles trapezoid, and the section of the protrusion 11 is an isosceles trapezoid. The section of the protrusion 11 is an isosceles trapezoid. When it rotates rapidly, it can generate a large wind force to ensure the heat dissipation effect of the rotor. A plurality of protrusions 11 are evenly distributed on the end ring 1 along the circumference of the end ring 1. The end ring 1, the protrusion 11 and the conductive rib 12 are integrally formed by a die-casting process. The conductive rib 12 is fixed in the gap between the spacer bars 32 by a die-casting process. By integrally forming the end ring 1, the protrusion 11 and the conductive rib 12 by a die-casting process, during the processing, its surface is smoother and has higher dimensional consistency, while ensuring the firmness of the connection between the end ring 1 and the protrusion 11 and the conductive rib 12.

[0024] See also Figure 1 、 Figure 4 and Figure 5The outer wall of the rotating shaft 2 is symmetrically provided with ridges 21 corresponding to the notches in the through holes 31. The outer wall of the rotating shaft 2 is provided with air ducts 22 located between the ridges 21. The air ducts 22 are respectively provided with air inlet notches 23 at one end close to the end ring 1. The air ducts 22 on the outer wall of the rotating shaft 2 are S-shaped. When in use, the rotor rotates to generate wind through the ridges 11. The generated wind enters the air duct 22 through the air inlet notches 23, taking away the heat generated by the rotor. The air duct 22 is set to be S-shaped, which increases the flow time of the cold wind in the air duct 22, so that it takes away more heat. The rotating shaft 2 is interference fit with the silicon steel sheet 3, and the rotating shaft 2 is fixed with the silicon steel sheet 3 by interference fit. At the same time, the ridges 21 of the rotating shaft 2 are clamped. It is connected to the gap of the spacer bar 32, which effectively prevents the rotation between the shaft 2 and the silicon steel sheet 3. At the same time, when producing the rotor, the gap of the ridge 21 and the spacer bar 32 is used to ensure that the positions of multiple shafts 2 stacked together are consistent. The height of the ridge 21 is greater than the total height of the stack of multiple shafts 2. By setting the height of the ridge 21 to be greater than the total height of the stack of multiple shafts 2, part of the ridge 21 is exposed on the outside of the shaft 2. When the rotor rotates at high speed, the exposed ridge 21 will generate wind to generate negative pressure at the end away from the end ring 1, accelerate the flow rate of the wind in the air duct 22, and then make the cold air flow rapidly in the air duct 22, so as to achieve the effect of rapid heat dissipation of the rotor.

[0025] During the manufacturing process of the present invention, multiple silicon steel sheets 3 are stacked on the rotating shaft 2, and the notches of the through holes 31 are stacked corresponding to the ridges 21 of the rotating shaft 2, so that the rotating shaft 2 and the stacked silicon steel sheets 3 have an interference fit. After completion, the sheets are placed in a die-casting machine for die-casting to form the end ring 1, the ridges 11 and the conductive ribs 12.

[0026] When the rotor is in use, the conductive ribs 12 generate current through the principle of electromagnetic induction, which is then affected by electromagnetic force to form eddy currents, thereby driving the motor to rotate, thereby causing the rotor to rotate at high speed. The rotation of the rotor generates wind through the protrusions 11, and the generated wind enters the air duct 22 through the air inlet notch 23, taking away the heat generated by the rotor. The air duct 22 is set to be S-shaped, which increases the flow time of the cold air in the air duct 22, so that it can take away more heat. At the same time, the height of the ridges 21 is set to be greater than the total height of the stacked multiple shafts 2, so that part of the ridges 21 are exposed on the outside of the shaft 2. When the rotor rotates at high speed, the exposed ridges 21 will generate wind to generate negative pressure at the end away from the end ring 1, accelerate the flow rate of the wind in the air duct 22, and thus make the cold air flow rapidly in the air duct 22, achieving the effect of rapid heat dissipation of the rotor.

[0027] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A cast copper squirrel cage rotor for a motor, characterized by: The invention comprises an end ring (1), wherein a plurality of silicon steel sheets (3) stacked on each other are provided at the upper end of the end ring (1), a through hole (31) is provided in the center of the silicon steel sheet (3), two symmetrical notches are provided in the through hole (31), a plurality of spacer bars (32) are provided along the circumference of the outer wall of the silicon steel sheet (3), the plurality of through holes (31) of the silicon steel sheets (3) form a channel, a rotating shaft (2) is provided in the channel, and gaps are provided between the spacer bars (32), and the gaps are sword-shaped; The lower end of the end ring (1) is provided with a plurality of protrusions (11) along its circumference, and the upper end of the end ring (1) is provided with a plurality of conductive ribs (12) along its circumference, and the conductive ribs (12) are inserted into the intervals between the spacer bars (32); The outer wall of the rotating shaft (2) is symmetrically provided with convex strips (21) corresponding to the inner notches of the through hole (31), and the outer wall of the rotating shaft (2) is provided with air ducts (22) located between two convex strips (21). The air ducts (22) are respectively provided with air inlet notches (23) at one end close to the end ring (1), and the height of the convex strips (21) is greater than the total height of the stacked plurality of rotating shafts (2).

2. The cast copper squirrel cage rotor of a motor according to claim 1, characterized in that: The cross section of the end ring (1) is an isosceles trapezoid, the section of the protrusion (11) is an isosceles trapezoid, and a plurality of the protrusions (11) are evenly distributed on the end ring (1) along the circumference of the end ring (1).

3. The cast copper squirrel cage rotor of a motor according to claim 1, characterized in that: The end ring (1), the protrusion (11) and the conductive rib (12) are integrally formed by a die-casting process.

4. The cast copper squirrel cage rotor of a motor according to claim 1, characterized in that: The spacer bars (32) are T-shaped, and the spacer bars (32) do not contact each other.

5. The cast copper squirrel cage rotor of a motor according to claim 1, characterized in that: The air duct (22) on the outer wall of the rotating shaft (2) is S-shaped, and the rotating shaft (2) and the silicon steel sheet (3) are interference fit.

6. The cast copper squirrel cage rotor of a motor according to claim 1, characterized in that: The conductive ribs (12) are fixed in the gaps between the spacer bars (32) using a die-casting process, and an insulating layer is provided on the surface of the silicon steel sheet (3).

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