CN212751926U - Copper-aluminum cage type motor rotor - Google Patents
Copper-aluminum cage type motor rotor Download PDFInfo
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- CN212751926U CN212751926U CN202021556575.9U CN202021556575U CN212751926U CN 212751926 U CN212751926 U CN 212751926U CN 202021556575 U CN202021556575 U CN 202021556575U CN 212751926 U CN212751926 U CN 212751926U
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Abstract
The utility model relates to the technical field of motor rotors, in particular to a copper-aluminum cage type motor rotor, which comprises a rotor core and a squirrel cage casting; a plurality of parallel squirrel cage grooves are uniformly distributed on the rotor iron core along the circumferential direction; the squirrel-cage casting comprises a plurality of squirrel-cage guide bars and two squirrel-cage end rings which are of an integral structure, the plurality of squirrel-cage guide bars which are parallel to each other are positioned between the two squirrel-cage end rings, the number of the squirrel-cage guide bars is equal to that of the squirrel-cage grooves, the squirrel-cage guide bars and the squirrel-cage grooves are tightly matched in the corresponding squirrel-cage grooves, and the two squirrel-cage end rings are tightly attached to two ends of the rotor; the squirrel cage conducting bar comprises a copper bar inner layer and a cast aluminum outer layer, and the cast aluminum outer layer is wrapped on the outer side of the copper bar inner layer. The squirrel cage conducting bar has aluminum crust and copper bars inside, does not need the matching of the copper bars and the rotor and the welding of the end rings and the conducting bars, has higher reliability, is easy to cast, is not easy to generate defects, has lower cost and lower resistivity of the copper bars, and has high efficiency when the motor of the rotor is used.
Description
Technical Field
The utility model relates to an electric motor rotor technical field especially relates to a copper aluminium cage type electric motor rotor.
Background
Squirrel cage rotor castings are important components of alternating current induction motors and have been widely used at present. The rotor structure which is applied more at present comprises: cast aluminum rotor structure, copper bar rotor structure and cast copper rotor structure.
The cast aluminum rotor structure: after being heated, an aluminum ingot is driven into laminated rotor punching sheets through a die casting machine, and meanwhile, end rings, balance columns and wind blade structures are formed at two ends of a rotor iron core through die casting, the structure is very common in small and medium-sized motors, but the motor efficiency using the rotor is difficult to improve due to the high resistivity of aluminum;
copper bar rotor structure: after the copper bar is processed to a certain shape and size, the copper bar is extruded into the rotor core through an extrusion process and is tightly matched with the rotor groove shape, the copper end ring is connected with the copper bar in a welding mode, the structure has high requirements on the degree of matching the copper bar with the rotor groove shape and the welding quality of the end ring and the guide bar, otherwise, the phenomena of the copper bar jumping and the desoldering in the groove can be caused, the hidden danger is brought to the long-term operation of the motor, and the reliability degree of the copper bar rotor is low;
the cast copper rotor structure: the melting point of copper is high, the copper core rotor is difficult to cast, the problems that the bubbles of a cast copper end ring are too much, cast copper cannot enter a gap and the like exist, and the manufacturing cost is greatly improved.
SUMMERY OF THE UTILITY MODEL
The utility model aims at solving the defects existing in the prior art and providing a copper-aluminum cage type motor rotor.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a copper-aluminum cage type motor rotor comprises a rotor iron core and a squirrel cage casting; a plurality of squirrel cage grooves which are parallel to each other are uniformly distributed on the rotor iron core along the circumferential direction; the squirrel-cage casting comprises a plurality of squirrel-cage guide bars and two squirrel-cage end rings which are of an integral structure, the plurality of squirrel-cage guide bars which are parallel to each other are positioned between the two squirrel-cage end rings, the number of the squirrel-cage guide bars is equal to that of the squirrel-cage grooves, the squirrel-cage guide bars and the squirrel-cage grooves are tightly matched in the corresponding squirrel-cage grooves, and the two squirrel-cage end rings are tightly attached to two ends of the rotor iron core respectively; the squirrel cage guide bar comprises a copper bar inner layer and a cast aluminum outer layer, and the cast aluminum outer layer is wrapped on the outer side of the copper bar inner layer.
Preferably, the rotor core is formed by laminating a plurality of rotor punching sheets, a plurality of squirrel cage holes with the same shape are uniformly distributed on the rotor punching sheets along the circumferential direction, and the squirrel cage holes are communicated with one another up and down to form a squirrel cage groove.
Preferably, the angle between the length direction of the squirrel-cage groove and the end face of the rotor core is 60-85 degrees.
Preferably, the inner end of the squirrel cage groove is provided with an inner arc part, and the outer end of the squirrel cage groove is provided with an outer arc part.
Preferably, the squirrel cage groove is an open groove, and an external communicating groove communicated with the outside is formed in the outer end of the squirrel cage groove.
Preferably, the squirrel cage groove is a closed groove, and the outer end of the squirrel cage groove is not communicated with the outside.
The utility model has the advantages that:
1. the squirrel cage conducting bar has aluminum outer skin and copper bar inside, and has no need of matching the copper bar with the rotor and welding the end ring with the conducting bar, easy casting, less defect and low cost.
2. The resistivity of the copper bar is lower, the problems of the copper bar in the groove of play and welding release are solved by the outer layer cast aluminum, the reliability is higher, and the efficiency of the motor using the rotor is high.
Drawings
FIG. 1 is a three-dimensional structure diagram of a rotor core of a copper-aluminum cage motor rotor according to the present invention;
FIG. 2 is a three-dimensional structure diagram of a squirrel cage casting of a copper-aluminum squirrel cage motor rotor provided by the utility model;
FIG. 3 is a top view cross-sectional structure diagram of a copper-aluminum cage motor rotor according to the present invention;
fig. 4 is a squirrel cage groove structure diagram of an embodiment of the copper-aluminum cage motor rotor provided by the utility model;
fig. 5 is a structural diagram of a two-cage groove of an embodiment of the copper-aluminum cage motor rotor provided by the utility model.
In the figure: 1-rotor iron core, 11-rotor punching sheet, 12-squirrel cage groove, 121-inner arc part, 122-outer arc part, 123-outer communicating groove, 2-squirrel cage casting, 21-squirrel cage guide bar, 211-copper bar inner layer, 212-cast aluminum outer layer and 22-squirrel cage end ring.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments.
The first embodiment is as follows: referring to fig. 1-4, a copper-aluminum cage motor rotor comprises a rotor core 1 and a cage casting 2;
the rotor core 1 is formed by laminating a plurality of rotor punching sheets 11, a plurality of squirrel cage holes with the same shape are uniformly distributed on the rotor punching sheets 11 along the circumferential direction of the rotor core 1, and after the plurality of rotor punching sheets 11 are laminated, the squirrel cage holes are communicated with one another up and down to form mutually parallel squirrel cage grooves 12;
furthermore, the squirrel-cage holes are offset one by one from top to bottom, so that the included angle between the length direction of the squirrel-cage grooves 12 and the rotor punching sheet 11 is 60-85 degrees.
The squirrel-cage casting 2 comprises a plurality of squirrel-cage conducting bars 21 and two squirrel-cage end rings 22 which are of an integral structure, the plurality of squirrel-cage conducting bars 21 which are parallel to each other are positioned between the two squirrel-cage end rings 22, the number of the squirrel-cage conducting bars 21 is equal to that of the squirrel-cage grooves 12, the squirrel-cage conducting bars and the squirrel-cage grooves 12 are tightly matched in the corresponding squirrel-cage grooves 12, and the two squirrel-cage end rings 22 are tightly attached to two ends of the;
the included angle between the length direction of the squirrel cage guide bar 21 and the squirrel cage end ring 22 is 60-85 degrees, so that the motor rotor obtains larger induced electromotive force and induced current.
The squirrel cage guide bar 21 comprises a copper bar inner layer 211 and a cast aluminum outer layer 212, and the cast aluminum outer layer 212 is wrapped on the outer side of the copper bar inner layer 211;
the squirrel-cage groove 12 is an open groove, the inner end of the squirrel-cage groove 12 is provided with an inner arc-shaped part 121, the outer end of the squirrel-cage groove 12 is provided with an outer arc-shaped part 122, the squirrel-cage groove 12 is communicated with the outside through an outer communicating groove 123, and in the casting process, the open groove is not easy to cause the defect of aluminum casting due to unsmooth exhaust, the leakage resistance of a rotor is reduced, and the loss of the stator is.
When processing, firstly, rotor punching sheets 11 are laminated into a rotor core 1, a copper bar is placed in each squirrel cage groove 12 of the rotor core 1, the copper bar is used as a copper bar inner layer 211 after being die-cast, then a combined piece of the rotor core 1 and the copper bar is placed into a die cavity of a die casting machine, an aluminum ingot is heated and melted and then is injected into the rotor core 1 through the die casting machine, squirrel cage guide bars 21 are formed in each squirrel cage groove 12 of the rotor core 1, squirrel cage end rings 22 are formed at two ends, a semi-finished product is taken out after demoulding, and a finished motor rotor is obtained through post-processing.
Example two: referring to fig. 5, the cage grooves 12 are closed grooves, and the outer ends of the cage grooves 12 are not communicated with the outside, so that the effective air gap is shortened, and the pulsation of the air-gap magnetic field is weakened, thereby reducing the excitation magnetic potential and reducing the loss of the harmonic magnetic field.
The above, only be the concrete implementation of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the utility model, the concept of which is equivalent to replace or change, should be covered within the protection scope of the present invention.
Claims (6)
1. A copper-aluminum cage type motor rotor is characterized by comprising a rotor iron core (1) and a squirrel cage casting (2);
a plurality of squirrel cage grooves (12) which are parallel to each other are uniformly distributed on the rotor iron core (1) along the circumferential direction;
the squirrel-cage casting (2) comprises a plurality of squirrel-cage guide bars (21) and two squirrel-cage end rings (22) which are of an integral structure, the plurality of squirrel-cage guide bars (21) which are parallel to each other are positioned between the two squirrel-cage end rings (22), the number of the squirrel-cage guide bars (21) is equal to that of the squirrel-cage grooves (12) and the squirrel-cage guide bars are tightly matched in the corresponding squirrel-cage grooves (12), and the two squirrel-cage end rings (22) are tightly attached to two ends of the rotor iron core (1) respectively;
the squirrel-cage guide bar (21) comprises a copper bar inner layer (211) and a cast aluminum outer layer (212), and the cast aluminum outer layer (212) wraps the outer side of the copper bar inner layer (211).
2. The copper-aluminum cage motor rotor as recited in claim 1, characterized in that said rotor core (1) is formed by laminating a plurality of rotor sheets (11), said rotor sheets (11) are uniformly distributed with a plurality of squirrel cage holes with the same shape along the circumference, and the squirrel cage holes are communicated with each other up and down to form a squirrel cage groove (12).
3. The copper-aluminum cage motor rotor according to claim 1, characterized in that the angle between the length direction of the cage grooves (12) and the end face of the rotor core (1) is 60-85 °.
4. A copper-aluminium cage motor rotor according to claim 1, characterised in that the inner ends of the cage grooves (12) are provided with inner arc-shaped portions (121) and the outer ends are provided with outer arc-shaped portions (122).
5. The copper-aluminum cage motor rotor as recited in claim 1 or 4, characterized in that said cage grooves (12) are open grooves, the outer ends of which are provided with external communication grooves (123) communicating with the outside.
6. A copper-aluminium cage motor rotor according to claim 1 or 4, characterized in that the cage grooves (12) are closed grooves, the outer ends of which do not communicate with the outside.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021556575.9U CN212751926U (en) | 2020-07-31 | 2020-07-31 | Copper-aluminum cage type motor rotor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021556575.9U CN212751926U (en) | 2020-07-31 | 2020-07-31 | Copper-aluminum cage type motor rotor |
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| Publication Number | Publication Date |
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| CN212751926U true CN212751926U (en) | 2021-03-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202021556575.9U Active CN212751926U (en) | 2020-07-31 | 2020-07-31 | Copper-aluminum cage type motor rotor |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114309543A (en) * | 2021-12-07 | 2022-04-12 | 卧龙电气驱动集团股份有限公司 | Production process of induction motor cast-aluminum rotor |
| CN114825833A (en) * | 2022-06-29 | 2022-07-29 | 常州市常华电机有限公司 | Rotor assembly of single-phase capacitor motor, processing equipment and processing method thereof |
-
2020
- 2020-07-31 CN CN202021556575.9U patent/CN212751926U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114309543A (en) * | 2021-12-07 | 2022-04-12 | 卧龙电气驱动集团股份有限公司 | Production process of induction motor cast-aluminum rotor |
| CN114309543B (en) * | 2021-12-07 | 2023-12-05 | 卧龙电气驱动集团股份有限公司 | Production process of cast aluminum rotor of induction motor |
| CN114825833A (en) * | 2022-06-29 | 2022-07-29 | 常州市常华电机有限公司 | Rotor assembly of single-phase capacitor motor, processing equipment and processing method thereof |
| CN114825833B (en) * | 2022-06-29 | 2022-09-02 | 常州市常华电机有限公司 | Rotor assembly of single-phase capacitor motor, processing equipment and processing method thereof |
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