CN111987825A

CN111987825A - Squirrel-cage rotor adapting to skin effect to improve conducting capacity of conducting bar

Info

Publication number: CN111987825A
Application number: CN202010913183.1A
Authority: CN
Inventors: 不公告发明人
Original assignee: Changsha Kaihu Equipment Co ltd
Current assignee: Changsha Kaihu Equipment Co ltd
Priority date: 2020-09-03
Filing date: 2020-09-03
Publication date: 2020-11-24

Abstract

The invention discloses a squirrel-cage rotor adapting to a skin effect to improve the conductivity of conducting bars, which comprises a first fastening ring and a second fastening ring, wherein an end ring group convenient for heat dissipation is fixedly arranged on the inner wall of the first fastening ring and the inner wall of the second fastening ring, and composite conducting bar mechanisms with electric conductivity and thermal conductivity are equidistantly arranged on the inner side of the end ring group.

Description

Squirrel-cage rotor adapting to skin effect to improve conducting capacity of conducting bar

Technical Field

The invention relates to the technical field of squirrel cage rotors, in particular to a squirrel cage rotor which adapts to the skin effect to improve the conducting capacity of conducting bars.

Background

A squirrel cage motor is one of three-phase asynchronous motors, and a squirrel cage rotor is a rotating part of the squirrel cage motor. Generally, a rotor coil made of copper or aluminum is cast in a cage-shaped groove on a rotor core, and the coil is a closed loop which is not connected with other parts and mainly used for inhibiting stator current.

The existing squirrel-cage rotor generates induced current in a rotating magnetic field, but due to the existence of skin effect, the distribution of the induced current on the cross section of a conducting bar is uneven, the current density on the surface of a conductor is higher than that in the center, the current is concentrated on the surface of the conductor to flow, which is equivalent to the reduction of the section of the conductor, the increase of resistance, the increase of heat productivity and the poor electrical and thermal conductivity, therefore, the squirrel-cage rotor which is suitable for the skin effect to improve the electrical conductivity of the conducting bar is provided.

Disclosure of Invention

The invention aims to provide a squirrel-cage rotor which is convenient for electric and thermal conductivity transmission and safe in use and adapts to the skin effect to improve the conductive capability of conducting bars, so as to solve the problems in the prior art.

In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides a public adaptation skin effect is with improving squirrel cage rotor of conducting bar conducting capacity, includes first tighrening ring and second tighrening ring, first tighrening ring inner wall and second tighrening ring inner wall fixed mounting have the radiating end ring group of being convenient for, the compound conducting bar mechanism of stable electric conductivity and heat conductivity is installed to end ring group inboard equidistance.

Preferably, the composite guide bar mechanism comprises a composite guide bar layer, an aluminum ring block and an aluminum core sleeve, the aluminum ring block is fixedly mounted on one side of the inner wall of the end ring set, the aluminum core sleeve is fixedly mounted at one end, far away from the aluminum ring block, of the end ring set, and the aluminum core sleeve is fixedly connected with the end ring set.

Preferably, the composite conducting bar layer comprises a silver layer, a copper layer and an aluminum core layer, the aluminum core layer is fixedly mounted on the inner wall of the aluminum core sleeve, the copper layer is sleeved on the outer wall of the aluminum core layer, and the silver layer is sleeved on the outer wall of the copper layer.

Preferably, the aluminium core cover includes spliced pole, spacing groove and ring channel, aluminium core layer one end fixed mounting has the spliced pole, spliced pole outer wall cover is equipped with the spacing groove, the corresponding position symmetry that the spliced pole outer wall is located the ring channel has seted up the ring channel.

Preferably, the end ring group comprises a large copper ring, a locking ring, a small copper ring, a lug, a ring strip and an aluminum ring sleeve, the locking ring is fixedly mounted on the outer wall of the connecting column, the aluminum ring sleeve is fixedly mounted on the outer wall of the aluminum ring block, the lug is mounted on the inner wall of the annular groove in a clamped manner, the large copper ring is fixedly mounted on the outer wall of the lug, the small copper ring is fixedly mounted on the inner wall of the large copper ring at the position corresponding to the lug, and the ring strip is fixedly mounted on the outer wall of the limiting groove.

Preferably, the limiting groove is matched with the aluminum ring sleeve structure, the annular groove and the end face of the lug are arc-shaped, and the annular groove is matched with the lug structure.

Compared with the prior art, the invention has the beneficial effects that:

the aluminum ring blocks and the aluminum core sleeves at the two ends of the composite conducting bar layer are matched with the aluminum ring sleeve structure through the limiting grooves and are matched with the annular grooves and the lug structures, so that the composite conducting bar layer is clamped with the end ring group, the radiating surface area is increased due to the fact that the annular bars, the large copper rings and the small copper rings are separated and hollowed out, the use of silver and copper is reduced, the cost is reduced, the composite conducting bar layer is light in weight due to the fact that most of the composite conducting bar layer is made of aluminum, the dynamic load generated by the operation of the composite conducting bar layer is reduced, and the composite conducting bar layer is convenient to stably transmit current so as to guarantee that the electrical conductivity and the thermal conductivity are in the best state.

Drawings

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a schematic structural diagram of a composite conducting bar mechanism according to the present invention;

FIG. 3 is a schematic view of a composite conductive strip layer structure according to the present invention;

FIG. 4 is a schematic view of the aluminum core sleeve structure of the present invention;

FIG. 5 is a schematic view of the end ring component distribution structure of the present invention;

fig. 6 is a schematic structural view of an end ring assembly of the present invention.

In the figure: 1. a composite conducting bar mechanism; 11. compounding a guide strip layer; 111. a silver layer; 112. a copper layer; 113. an aluminum core layer; 12. an aluminum ring block; 13. an aluminum core sleeve; 131. connecting columns; 132. a limiting groove; 133. an annular groove; 2. a set of end rings; 21. a large copper ring; 22. a locking ring; 23. a small copper ring; 24. a lug; 25. a ring strip; 26. an aluminum ring sleeve; 3. a first fastening ring; 4. a second fastening ring.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1, a squirrel cage rotor adapted to the skin effect to improve the conductivity of the conducting bars is shown, comprising a first fastening ring 3 and a second fastening ring 4, which are constructed to suppress the stator current by the structure of the squirrel cage rotor.

Referring to fig. 1, an end ring group 2 convenient for heat dissipation is fixedly mounted on an inner wall of the first fastening ring 3 and an inner wall of the second fastening ring 4, composite bar guiding mechanisms 1 with stable electrical conductivity and thermal conductivity are equidistantly mounted on an inner side of the end ring group 2, the composite bar guiding mechanisms 1 are inserted into the silicon steel lamination layer, two ends of the composite bar guiding mechanisms are connected through the heat dissipation end ring group 2, and the heat dissipation end ring group 2 adopts a multi-section structure, so that not only is the current flowing area of the end ring ensured to be sufficient, but also the surface area of the end ring is improved

Referring to fig. 2, the composite bar guiding mechanism 1 includes a composite bar guiding layer 11, an aluminum ring block 12 and an aluminum core sleeve 13, the aluminum ring block 12 is fixedly mounted on one side of the inner wall of the end ring set 2, the aluminum core sleeve 13 is fixedly mounted on one end of the end ring set 2 far away from the aluminum ring block 12, and the aluminum core sleeve 13 is fixedly connected to the end ring set 2, so as to change the structure of the composite bar guiding layer 11 by using the skin effect, thereby ensuring that the electrical conductivity and the thermal conductivity are both in the best state.

Referring to fig. 3, the composite guide strip layer 11 includes a silver layer 111, a copper layer 112 and an aluminum core layer 113, the aluminum core layer 113 is fixedly mounted on the inner wall of the aluminum core sleeve 13, the copper layer 112 is sleeved on the outer wall of the aluminum core layer 113, the silver layer 111 is sleeved on the outer wall of the copper layer 112, and the cost is reduced by reducing the use of silver and copper, because most of the composite guide strip layer 11 is made of aluminum, the composite guide strip layer 11 has lighter mass and reduces the dynamic load generated by the operation of the composite guide strip layer, when the frequency of induced current is higher, the skin effect is obvious, the current flows on the surface, and because the outer ring of the composite guide strip layer 11 is made of the silver layer 111, the conductivity of the silver layer 111 is optimal, the resistance is very small, the conductivity under the skin effect; when the frequency of the induction current is moderate, the skin effect is reduced, the current passes through the silver layer 111 on one hand and the copper layer 112 on the other hand, and although the heat conduction and the electric conductivity of the copper layer 112 are not as good as those of the silver layer 111, the cross-sectional area is larger than that of the silver layer 111, so the heat conduction and the electric conductivity are still ensured; when the frequency of the induced current is moderate and the skin effect is neglected, the current can pass through the silver, copper and aluminum core layers 113, although the electric and thermal conductivity of the aluminum core layer 113 is not as good as that of the copper layer 112 and the silver layer 111, the cross-sectional area is maximized, so that the heat conductivity and the electric conductivity can be ensured.

Referring to fig. 4, the aluminum core sleeve 13 includes a connection post 131, a limiting groove 132 and an annular groove 133, the connection post 131 is fixedly installed at one end of the aluminum core layer 113, the limiting groove 132 is sleeved on the outer wall of the connection post 131, the annular groove 133 is symmetrically formed at a position of the outer wall of the connection post 131 corresponding to the annular groove 133, and the limiting groove 132 and the annular groove 133 are matched with the annular group 2 to realize stable current transmission and improve heat dissipation.

Referring to fig. 5 and 6, the end ring assembly 2 includes a large copper ring 21, a locking ring 22, a small copper ring 23, a lug 24, a ring strip 25 and an aluminum ring sleeve 26, the locking ring 22 is fixedly installed on the outer wall of the connecting column 131, the aluminum ring sleeve 26 is fixedly installed on the outer wall of the aluminum ring block 12, the lug 24 is installed on the inner wall of the annular groove 133 in a clamping manner, the large copper ring 21 is fixedly installed on the outer wall of the lug 24, the small copper ring 23 is fixedly installed on the inner wall of the large copper ring 21 at a position corresponding to the lug 24, the ring strip 25 is fixedly installed on the outer wall of the limiting groove 132, the large copper ring 21 and the small copper ring 23 form a heat dissipation end ring, because the ring strip 25, the large copper ring 21 and the small copper ring 23 are separated from each other, the heat dissipation surface area is increased, because the first fastening ring 3 is installed outside the large copper ring 21, the second fastening ring 4 is installed inside the small copper ring 23, and, the connection strength between the aluminum core layer 113 and the centrifugal force and the environment with expansion and contraction is ensured, and the locking ring 22 is welded outside the aluminum core layer 113, so that the large copper ring 21 and the small copper ring 23 can be axially positioned conveniently.

Referring to fig. 4 and 6, the limiting groove 132 is structurally matched with the aluminum ring sleeve 26, the annular groove 133 is arc-shaped with the end surface of the lug 24, and the annular groove 133 is structurally matched with the lug 24, so that the composite conducting bar layer 11 of the squirrel cage rotor is clamped with the end ring group 2, and stable current transmission is facilitated.

In this scheme, through the aluminium circle piece 12 and the aluminium core cover 13 with compound conducting bar layer 11 both ends through spacing groove 132 and aluminium circle cover 26 structure cooperation, and ring channel 133 and lug 24 structure cooperation, realize that compound conducting bar layer 11 and end ring group 2 carry out the block, again because the ring strip 25, big copper ring 21, separation fretwork between little copper ring 23, the heat radiating surface area is improved, the setting of this device is through reducing silver, the use of copper, reduce the cost, because compound conducting bar layer 11 is aluminium for the majority, make compound conducting bar layer 11 quality lighter, reduce the dynamic load that its operation produced, be convenient for stabilize transmission current and all be in the optimum with assurance electric conductivity and heat conductivity.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. A squirrel cage rotor adapted to the skin effect to improve the conductivity of the bars, comprising a first fastening ring (3) and a second fastening ring (4), characterized in that: first tighrening ring (3) inner wall and second tighrening ring (4) inner wall fixed mounting have be convenient for radiating end ring group (2), end ring group (2) inboard equidistance is installed and is stabilized compound conducting bar mechanism (1) of electric conductivity and heat conductivity.

2. A squirrel cage rotor adapted to the skin effect to improve the conductivity of the conductors as claimed in claim 1, wherein: the composite guide bar mechanism (1) comprises a composite guide bar layer (11), an aluminum ring block (12) and an aluminum core sleeve (13), wherein the aluminum ring block (12) is fixedly mounted on one side of the inner wall of the end ring group (2), the aluminum core sleeve (13) is fixedly mounted at one end, far away from the aluminum ring block (12), of the end ring group (2), and the aluminum core sleeve (13) is fixedly connected with the end ring group (2).

3. A squirrel cage rotor adapted to the skin effect to improve the conductivity of the conductors as claimed in claim 2, wherein: the composite guide strip layer (11) comprises a silver layer (111), a copper layer (112) and an aluminum core layer (113), wherein the aluminum core layer (113) is fixedly mounted on the inner wall of the aluminum core sleeve (13), the copper layer (112) is sleeved on the outer wall of the aluminum core layer (113), and the silver layer (111) is sleeved on the outer wall of the copper layer (112).

4. A squirrel cage rotor adapted to the skin effect to improve the conductivity of the conductors as claimed in claim 2, wherein: the aluminum core sleeve (13) comprises a connecting column (131), a limiting groove (132) and an annular groove (133), wherein the connecting column (131) is fixedly mounted at one end of the aluminum core layer (113), the limiting groove (132) is sleeved on the outer wall of the connecting column (131), and the annular groove (133) is symmetrically arranged at the corresponding position of the outer wall of the connecting column (131) located in the annular groove (133).

5. A squirrel cage rotor adapted to the skin effect to improve the conductivity of the conductors as claimed in claim 1, wherein: the end ring group (2) comprises a large copper ring (21), a locking ring (22), a small copper ring (23), a lug (24), a ring strip (25) and an aluminum ring sleeve (26), the locking ring (22) is fixedly mounted on the outer wall of the connecting column (131), the aluminum ring sleeve (26) is fixedly mounted on the outer wall of the aluminum ring block (12), the lug (24) is mounted on the inner wall of the annular groove (133) in a clamped mode, the large copper ring (21) is fixedly mounted on the outer wall of the lug (24), the small copper ring (23) is fixedly mounted at the corresponding position of the inner wall of the large copper ring (21) located on the lug (24), and the ring strip (25) is fixedly mounted on the outer wall of the limiting.

6. A squirrel cage rotor adapted to the skin effect to improve the conductivity of the conductors as claimed in claim 5, wherein: the limiting groove (132) is matched with the aluminum ring sleeve (26) in structure, the annular groove (133) and the end face of the lug (24) are arc-shaped, and the annular groove (133) is matched with the lug (24) in structure.