阅读说明：本技术 一种能提升导条强度的鼠笼形转子 (Squirrel-cage rotor capable of improving strength of conducting bar ) 是由 吕丽欣 于 2019-11-13 设计创作，主要内容包括：本发明公开了一种能提升导条强度的鼠笼形转子,包括：呈圆柱体的转子轴；转子芯、呈六面体的导条、端环和端盖,所述导条两端突出所述转子芯,所述转子轴两端突出所述端盖。本发明中,该鼠笼形转子的导条为六面体,采用斜置的方式布置,且端环与导条的接触面倾斜,径向压力减小,增强其抗剪切性能,在转子的高速运转过程中,不容易发生导条断裂,且通风散热性能好,进一步降低断条的风险。(The invention discloses a squirrel-cage rotor capable of improving the strength of conducting bars, which comprises: a rotor shaft in the form of a cylinder; the rotor comprises a rotor core, hexahedral guide bars, end rings and end covers, wherein two ends of each guide bar protrude out of the rotor core, and two ends of a rotor shaft protrude out of the end covers. In the invention, the conducting bars of the squirrel-cage rotor are hexahedron and are arranged in an inclined mode, the contact surface of the end ring and the conducting bars is inclined, the radial pressure is reduced, the anti-shearing performance of the squirrel-cage rotor is enhanced, the conducting bars are not easy to break in the high-speed operation process of the rotor, the ventilation and heat dissipation performance is good, and the risk of the broken bars is further reduced.)

1. A squirrel cage rotor having improved bar strength, comprising:

a rotor shaft in the form of a cylinder;

the rotor core is sleeved on the rotor shaft and fixedly connected with the rotor shaft, a plurality of grooves are formed in the peripheral wall of the rotor core along the axial direction of the rotor core, the section of each groove in the radial direction of the rotor core is quadrilateral, each quadrilateral is provided with a bottom edge close to the rotor shaft, a top edge far away from the rotor core, a first side edge and a second side edge adjacent to the bottom edge, a perpendicular line passing through the middle point of any one of the top edge, the bottom edge, the first side edge and the second side edge does not pass through the axis of the rotor shaft, and an opening is formed in the joint of the top edge and the first side edge;

the guide bars are arranged in the grooves in a penetrating mode, the number of the guide bars is multiple, the guide bars are evenly distributed on the peripheral wall of the rotor core and comprise connecting sections, the two ends of each connecting section are connected with transmission sections, and the areas of the sections of the transmission sections are gradually reduced from the positions close to the connecting sections to the positions far away from the connecting sections;

the two ends of the rotor core are respectively provided with one end ring, and the peripheral walls of the two end rings are respectively provided with a guide groove matched with the transmission section; the end ring is provided with two end faces which are parallel to each other, the guide groove is provided with two inclined faces, the two inclined faces are obliquely arranged relative to the two end faces which are parallel to each other, and included angles between the inclined faces and the two end faces which are parallel to each other are acute angles; the connecting section is inserted into the guide groove and matched with the guide groove;

the end covers are respectively arranged at one ends of the two end rings far away from the rotor core, and the end covers penetrate through the rotor shaft; (ii) a

The two ends of the conducting bar protrude out of the rotor core, and the two ends of the rotor shaft protrude out of the end covers.

2. A squirrel cage rotor as claimed in claim 1 having improved bar strength, wherein:

the rotor core is formed by a plurality of punching sheets in the axial direction of the rotor shaft in an overlapping mode, punching sheets are provided with punching grooves, and a plurality of punching grooves form a plurality of grooves in the axial direction of the rotor shaft.

3. A squirrel cage rotor as claimed in claim 1 having improved bar strength, wherein:

and a pressing ring is arranged on the inner side of the end ring and penetrates through the rotor shaft to be fixedly connected with the end ring.

4. A squirrel cage rotor as claimed in claim 3, wherein the cage rotor has a plurality of bars, each bar having a plurality of slots for receiving the cage rotor, and each of the slots having a plurality of slots for receiving the bars:

the pressing ring is provided with a pressing ring ventilation hole and a pressing ring shaft hole, and the punching sheet is provided with a punching sheet ventilation hole and a punching sheet shaft hole; the clamping ring ventilation hole is coaxial with the punching sheet ventilation hole, and the clamping ring shaft hole is coaxial with the punching sheet shaft hole.

5. A squirrel cage rotor as claimed in claim 1 having improved bar strength, wherein:

the inner wall of the end cover is in contact connection with the guide bars and/or the end rings;

the surfaces of the two end covers are also provided with a plurality of end cover holes coaxial with the punching sheet vent holes, and wind wheels are arranged in the end cover holes;

and the end cover is provided with an end cover shaft hole coaxial with the pressing ring shaft hole.

6. A squirrel cage rotor as claimed in claim 5 having improved bar strength, wherein:

the blade inclination angles of the wind wheels at the two ends are the same, and the rotation directions are consistent.

7. A squirrel cage rotor as claimed in claim 1 having improved bar strength, wherein:

a circular truncated cone-shaped stop table is arranged between the end cover and the rotor shaft, and the stop table is elastically connected with the rotor shaft;

the radius of one end, close to the rotor core, of the stop table is smaller than that of one end, far away from the rotor core, of the stop table;

the surface of the stop table is coated with an insulating material.

8. A squirrel cage rotor as claimed in claim 7 having improved bar strength, wherein:

the surface of the shaft hole of the end cover is obliquely arranged and matched with the stop table.

Technical Field

The invention relates to the technical field of wire harness rotors, in particular to a squirrel-cage rotor capable of improving the strength of conducting bars.

Background

The squirrel cage rotor generally includes a rotor core and bars for fixing the rotor core as a unit, and the bars are easily broken in the axial direction during the high-speed rotation of the rotor, so that it is important to improve the strength of the bars.

Disclosure of Invention

In view of the above-mentioned deficiencies in the prior art, the present invention provides a squirrel-cage rotor capable of improving the strength of conducting bars, which is used to solve the problem that the conducting bars are easy to break in the prior art.

The technical scheme adopted by the invention for solving the technical problems is that the squirrel-cage rotor capable of improving the strength of conducting bars comprises:

a rotor shaft in the form of a cylinder;

the rotor core is sleeved on the rotor shaft and fixedly connected with the rotor shaft, a plurality of grooves are formed in the peripheral wall of the rotor core along the axial direction of the rotor core, the section of each groove in the radial direction of the rotor core is quadrilateral, each quadrilateral is provided with a bottom edge close to the rotor shaft, a top edge far away from the rotor core, a first side edge and a second side edge adjacent to the bottom edge, a perpendicular line passing through the middle point of any one of the top edge, the bottom edge, the first side edge and the second side edge does not pass through the axis of the rotor shaft, and an opening is formed in the joint of the top edge and the first side edge;

the guide bars are arranged in the grooves in a penetrating mode, the number of the guide bars is multiple, the guide bars are evenly distributed on the peripheral wall of the rotor core and comprise connecting sections, the two ends of each connecting section are connected with transmission sections, and the areas of the sections of the transmission sections are gradually reduced from the positions close to the connecting sections to the positions far away from the connecting sections;

the two ends of the rotor core are respectively provided with one end ring, and the peripheral walls of the two end rings are respectively provided with a guide groove matched with the transmission section; the end ring is provided with two end faces which are parallel to each other, the guide groove is provided with two inclined faces, the two inclined faces are obliquely arranged relative to the two end faces which are parallel to each other, and included angles between the inclined faces and the two end faces which are parallel to each other are acute angles; the connecting section is inserted into the guide groove and matched with the guide groove;

the end covers are respectively arranged at one ends of the two end rings far away from the rotor core, and the end covers penetrate through the rotor shaft;

the two ends of the conducting bar protrude out of the rotor core, and the two ends of the rotor shaft protrude out of the end covers.

Preferably, the rotor core is formed by axially stacking a plurality of punching sheets on the rotor shaft, the punching sheets are provided with punching grooves, and the plurality of punching grooves form a plurality of grooves in the axial direction of the rotor shaft.

Preferably, a pressing ring is arranged on the inner side of the end ring, and the pressing ring penetrates through the rotor shaft and is fixedly connected with the end ring.

Preferably, the pressing ring is provided with a pressing ring ventilation hole and a pressing ring shaft hole, and the punching sheet is provided with a punching sheet ventilation hole and a punching sheet shaft hole; the clamping ring ventilation hole is coaxial with the punching sheet ventilation hole, and the clamping ring shaft hole is coaxial with the punching sheet shaft hole.

Preferably, the inner wall of the end cover is in contact connection with the guide bars and/or the end rings;

the surfaces of the two end covers are also provided with a plurality of end cover holes coaxial with the punching sheet vent holes, and wind wheels are arranged in the end cover holes;

and the end cover is provided with an end cover shaft hole coaxial with the pressing ring shaft hole.

Preferably, the blade inclination angles of the wind wheels at the two ends are the same, and the rotation directions are consistent.

Preferably, a circular truncated cone-shaped stop table is arranged between the end cover and the rotor shaft, and the stop table is elastically connected with the rotor shaft;

the radius of one end, close to the rotor core, of the stop table is smaller than that of one end, far away from the rotor core, of the stop table;

the surface of the stop table is coated with an insulating material.

Preferably, the inner surface of the end cover is obliquely arranged and matched with the stop table.

Compared with the prior art, the invention has at least the following beneficial effects:

in the invention, the conducting bars of the squirrel-cage rotor are hexahedron and are arranged in an inclined mode, the contact surface of the end ring and the conducting bars is inclined, the radial pressure is reduced, the anti-shearing performance of the squirrel-cage rotor is enhanced, the conducting bars are not easy to break in the high-speed operation process of the rotor, the ventilation and heat dissipation performance is good, and the risk of the broken bars is further reduced.

Drawings

FIG. 1 is a schematic view of a rotor with an end cover removed in the embodiment;

FIG. 2 is a schematic diagram of a punching sheet in the embodiment;

FIG. 3 is a schematic view of a conducting bar in an embodiment;

FIG. 4 is a schematic view of an end ring in an embodiment;

FIG. 5 is a schematic view of a pressing ring in the embodiment;

FIG. 6 is a schematic view of an end cap according to an embodiment;

100-a rotor shaft;

200-a rotor core; 210-punching; 211-quadrilateral; 211 a-bottom edge; 211 b-top edge; 211 c-first side; 211 d-second side edge; 212-punching sheet shaft hole; 213-a punch vent;

300-conducting bars; 310-a transmission section; 320-connecting section

400-end ring; 410-a guide groove; 411-inclined plane; 420-end face;

500-pressing a ring; 510-clamping ring vent hole; 520-pressing ring shaft hole;

600-end caps; 610-end cap holes; 611-wind wheel; 620-end cap shaft hole;

700-a stop table;

Detailed Description

The following are specific embodiments of the present invention and are further described with reference to the drawings, but the present invention is not limited to these embodiments.

Referring to fig. 1 to 6, the present invention discloses a squirrel-cage rotor capable of improving the strength of conducting bars, which includes a cylindrical rotor shaft 100;

the rotor core 200 is sleeved on the rotor shaft 100 and fixedly connected with the rotor shaft 100, a plurality of grooves are formed in the circumferential wall of the rotor core 200 along the axial direction of the rotor core, the section of each groove in the radial direction of the rotor core is a quadrangle 211, each quadrangle 211 is provided with a bottom side 211a close to the rotor shaft, a top side 211b far away from the rotor core, a first side 211c adjacent to the bottom side and a second side 211d, a perpendicular line passing through the middle point of any one of the top side 211b, the bottom side 211a, the first side 211c and the second side 211d does not pass through the axis of the rotor shaft 100, and an opening is formed in the connection position of the top side 211b and the first side 211 c; the perpendicular line passing through the midpoint of any one of the four sides of the cross section of the quadrangle 211 does not pass through the axis of the rotor shaft 100, that is, the grooves are arranged obliquely, and the cross section is rectangular in this embodiment, so that two symmetrical axes of the rectangle do not pass through the axis of the rotor shaft 100.

The guide bars 300 are hexahedral and penetrate the grooves, the number of the guide bars 300 is multiple, the guide bars 300 are uniformly distributed on the circumferential wall of the rotor core 200, the guide bars 300 include a connecting section 320, two ends of the connecting section 320 are connected with transmission sections 310, and the area of the cross section of each transmission section 310 gradually decreases from the position close to the connecting section 320 to the position far away from the connecting section 320; in colloquial terms, the transmission section 310 is provided with an inclined surface, and the inclined direction is expressed as: the cross-sectional area of the transmission section 310 on the side close to the connection section 320 is gradually reduced toward the side far from the connection section 320.

End rings 400, one of which is provided at each end of the rotor core 200, and guide grooves 410 which are matched with the transmission sections 310 are provided on the peripheral walls of the two end rings 400; the end ring 400 has two end surfaces 420 which are parallel to each other, the guide groove 410 has two inclined surfaces 411, the two inclined surfaces 411 are arranged obliquely relative to the two end surfaces 420 which are parallel to each other, and the included angles between the inclined surfaces 411 and the two end surfaces 420 which are parallel to each other are acute angles; the connection segment 320 is inserted into the guide groove 410 and is matched with the guide groove 410; the end ring 400 is welded to the guide bars 300, and the contact surface between the end ring 400 and the guide bars 300 is inclined to increase the contact area between the end ring 400 and the guide bars 300, thereby reducing the radial stress on both ends of the guide bars 300.

End caps 600, one end of each of the end rings 400 away from the rotor core 200, the end caps 600 penetrating the rotor shaft 100;

both ends of the conducting bar 300 protrude from the rotor core 200, and both ends of the rotor shaft 100 protrude from the end caps 600.

The rotor core 200 is formed by axially stacking a plurality of punching sheets 210 on the rotor shaft 100, the punching sheets 210 are provided with punching grooves, and a plurality of the punching grooves form a plurality of grooves in the axial direction of the rotor shaft. The punching sheet 210 is a silicon steel sheet, and the connection between the silicon steel sheet and the rotor shaft 100 adopts a heating sleeve pressing and fixing mode.

A clamping ring 500 is arranged inside the end ring 400, and the clamping ring 500 is fixedly connected with the end ring 400 through the rotor shaft 100. The side of the clamping ring 500 may be provided with at least one positioning hole, and the inner side of the end ring 400 is also provided with at least one positioning hole, which are fixedly connected by a positioning pin.

The pressing ring 500 is provided with a pressing ring vent hole 510 and a pressing ring shaft hole 520, and the punching sheet 210 is provided with a punching sheet vent hole 213 and a punching sheet shaft hole 212; the clamping ring vent hole 510 is coaxial with the punching sheet vent hole 213, and the clamping ring shaft hole 520 is coaxial with the punching sheet shaft hole 212. The two ventilation holes are aligned for better heat dissipation, and other adverse effects such as breakage of the conducting bar 300 caused by heat failure are prevented.

The inner wall of the end cap 600 is in contact connection with the guide bars 300 and/or the end ring 400; the lower surface of the end cover 600 is in contact connection with the guide bars 300 and the end ring 400, and the inner wall of the side surface of the end cover 600 is in contact connection with the guide bars 300, so that the centrifugal force of a part of the two ends of the guide bars 300 can be resisted, the stress of the welding part of the end ring 400 and the guide bars 300 is shared, the risk of breakage of the guide bars 300 is further reduced, and the end ring 400 can be prevented from falling off in the moving process of the rotor.

The surfaces of the two end covers 600 are also provided with a plurality of end cover holes 610 coaxial with the vent holes of the punching sheet 210, and wind wheels 611 are arranged in the end cover holes 610; the end cover 600 is provided with an end cover shaft hole 620 which is coaxial with the pressing ring shaft hole 520.

The blade inclination angles of the wind wheels 611 at the two ends are the same, and the rotation directions are the same.

The wind wheel 611 is arranged mainly for discharging hot air in the rotor shaft 100 and blowing in cold air from the outside, and the same rotation direction and the same inclination angle of the wind wheel 611 ensure that the hot air is discharged and the cold air is introduced simultaneously and the air inflow and the air outflow are approximately the same when the rotor rotates forwards or backwards, so that good heat dissipation can be ensured in the rotor shaft 100, and accidents caused by overhigh temperature can be avoided.

A truncated cone-shaped stop table 700 is arranged between the end cover 600 and the rotor shaft 100, and the stop table 700 is elastically connected with the rotor shaft 100; the radius of the end of the stop table 700 close to the rotor core 200 is smaller than that of the end far away from the rotor core 200; the surface of the stop table 700 is coated with an insulating material.

The surface of the end cover shaft hole 620 is obliquely arranged and is matched with the stop table 700.

The insulating material coated on the stop table 700 is to prevent an accident caused by leakage, an elastic disc is disposed between the stop table 700 and the rotor shaft 100 to provide a pre-tightening force, the stop table 700 is a circular table, and the inner surface of the end cap 600 has an inclined surface engaged with the stop table 700, so that the end ring 400 is always tightly attached to the end cap 600.

Generally, the conducting bars of the squirrel-cage rotor are hexahedrons and are arranged in an inclined mode, the contact surface of the end ring and the conducting bars is inclined, the radial pressure is reduced, the anti-shearing performance of the squirrel-cage rotor is enhanced, the conducting bars are not prone to being broken in the high-speed operation process of the rotor, the ventilation and heat dissipation performance is good, and the risk of broken bars is further reduced.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.