CN117728609A - Low-resistance coil of aluminum-clad copper electromagnetic wire and motor stator - Google Patents

Abstract

The invention relates to a low-resistance coil of an aluminum-clad copper electromagnetic wire and a motor stator, wherein one half of the wire is aluminum, and the other half is copper. Aluminum on one side of the electromagnetic wire wound between the stator grooves is reduced, and triangular copper is reserved to be capable of being arranged in the trapezoid groove and the slotted hole in a self-adaptive manner; the aluminum at one side of the electromagnetic wire outside the stator slot is reserved, so that the coil resistance is reduced, and the weight reduction and the copper cost reduction of unmanned aerial vehicles, new energy passenger car motors, motorcycle motors and flat wire motors are effectively realized. When the outer edges of the stator coil slots are overlapped, the heat dissipation notches of the aluminum layers at the two ends of the reduced material part are exposed, so that the ventilation can force the end parts to dissipate heat. A series of technical means realize motor coil "full groove" (refer to equivalent resistance) to promote motor efficiency, increase moment of torsion, promote manned vehicle, namely electric aircraft's high value motor efficiency to the limit.

Description

Low-resistance coil of aluminum-clad copper electromagnetic wire and motor stator

Technical Field

The invention relates to the technical field of motors, in particular to a low-resistance coil of an aluminum-clad copper electromagnetic wire and a motor stator.

Background

In the prior art, a motor stator adopts a lap winding or a wave winding, only enameled wires with limited turns can be wound in the slot spacing of the stator, and the slot filling rate is only 50-80%. Along with industrialization of new energy electric vehicles, unmanned aerial vehicles and motorcycles, how to adopt wires with single geometric dimensions breaks through the groove full rate, reduces armature resistance, lightens weight and reduces working temperature, and meets market demands is an innovative problem to be solved urgently.

Disclosure of Invention

In order to achieve the above purpose, the present invention adopts the following technical scheme that as many wires as possible need to be wound into a limited stator slot:

first, the aluminum-coated copper electromagnetic wire adopts a copper coating process at one side of the aluminum wire.

The electromagnetic wire coated with copper by aluminum is provided with at least two planes;

half of the side surface of the electromagnetic wire is an aluminum layer, and the other half of the side surface of the electromagnetic wire is a copper layer;

the copper cladding is formed with an open ring outside the aluminum layer wire core, and the wrapping mode is C-shaped.

The ring with the opening formed on the half-side copper layer is triangular.

The half-side aluminum layer is triangular, and is provided with a heat dissipation groove along the axial direction.

The aluminum copper coating is to coat copper on one side of an aluminum layer wire, and is different from wrapping; but the aluminum layer wire extends into one side of copper in the electromagnetic wire, and a wrapped state is formed on one side of the copper layer aluminum wire core part, so that the internal wrapping structure of the electromagnetic wire is realized, and the external part is of a copper-clad layer structure.

And an aluminum layer is arranged on one half side surface of the electromagnetic wire and used for material reduction treatment according to requirements in later-stage coil winding. Because the price of aluminum is low, the material reduction cost is low, the material waste is less, and the difficulty in realizing the material reduction process is low. After the aluminum layer is turned, the processed surface is easy to form aluminum oxide, and an insulating layer is naturally formed, so that re-insulating treatment is not needed in the later stage of the coil.

Secondly, the invention performs deep design on the armature winding, and is designed aiming at the inner side and the outer side of the winding in a separated topology. The copper wires with a certain section are densely distributed among the slot distances, namely the adjacent tunnel parts of the windings, such as limited space in the slots; the outside space of the groove is open, and the available space exists outside the winding.

The low-resistance coil of the aluminum-clad copper electromagnetic wire and the motor stator are characterized in that:

the electromagnetic wire is wound into the slot inner edge of the stator slot and is thinned, so that more turns of wire can be wound into the slot;

the electromagnetic wire outside the stator slot has a large section reserved, so that the coil resistance is reduced.

The electromagnetic wire is formed by processing aluminum coated copper.

And a radiating groove is formed in one side of the aluminum along the axial direction. Even if the electromagnetic wires outside the stator slots are in multi-layer lap winding, the heat dissipation notches of the aluminum layers at the two ends of the subtracted part are exposed, and the end part side heat dissipation can be forced by ventilation.

The aluminum on one side of the electromagnetic wire is reduced, and the copper with the triangle shape is reserved and can be arranged in the trapezoid groove in a self-adaptive manner with the slotted hole.

The technical means realizes full slot (equivalent resistance) of the coil, so as to improve the efficiency of the motor and increase the torque.

The invention also utilizes the defect of skin effect, and adopts aluminum material at the copper core part of the composite wire; when the motor is started, the armature direct current resistance is slightly increased to reduce the starting current, and the controller is protected from being damaged by large current impact; and the armature is a high frequency current that is passed during high speed operation. The wire is mainly arranged on the surface layer of the wire, and the current of the wire core layer is small, so that the wire core layer is more reasonable to adopt aluminum wires.

In products with light weight applications, such as aircraft, the weight of the aircraft can be effectively reduced, and the tension of the aircraft can be improved.

The invention has the beneficial effects that:

1. the outside space of the groove is utilized, so that the sectional area of the aluminum-copper composite electromagnetic wire is increased;

2. the skin effect principle is utilized, so that the wire core is light and the copper cost is reduced;

3. the aluminum-copper composite electromagnetic wire reduces the working temperature and resistance of the armature;

4. the aluminum layer heat dissipation grooves are utilized to realize ventilation and heat dissipation in the end parts of the multi-layer lap winding.

Wherein:

FIG. 1 is a schematic cross-sectional view of the inner edges of the coil slot and aluminum copper composite magnet wire structure of the present invention;

FIG. 2 is a schematic diagram of an aluminum copper composite electromagnetic wire structure according to the present invention;

FIG. 3 is a schematic diagram of the copper layer structure of the inner side of the slot after the aluminum-copper composite electromagnetic wire is cut;

FIG. 4 is a schematic view of the stator coil of the present invention after the inner edges of the stator coil slots have been cut;

FIG. 5 is a schematic view showing ventilation of a cutting opening formed by overlapping the outer edge of a slot around a heat dissipation slot after the inner edge of the stator coil slot is cut.

In the figure:

1. a special-shaped line; 2. the inner edge of the groove; 3. the outside of the groove; 4. an aluminum layer; 5. a copper layer; 6. an iron core; 7. a heat sink; 8. an aluminum core.

Description of the embodiments

An embodiment, as shown in fig. 1 and 2, is an aluminum-clad copper electromagnetic wire of the present invention.

The copper coating process is adopted on one side of the aluminum wire, one half of the side face of the electromagnetic wire is an aluminum layer (4), and the other half of the side face of the electromagnetic wire is a copper layer (5). The copper portion is provided with at least two planes.

As shown in fig. 2, the copper cladding forms an open ring outside the aluminum core (8), and the semi-side copper layer (5) forms an open ring with a triangle shape.

The half-side aluminum layer (4) is triangular, and is provided with a heat dissipation groove (7) along the axial direction. An aluminum core (8) is arranged outside the triangle of the aluminum layer (4).

The aluminum copper coating is to coat copper on one side of an aluminum wire, and is different from wrapping; but the aluminum layer (4) is extended into one side of copper in the aluminum core (8) in the electromagnetic wire, and the wire core part of the aluminum layer (4) is in a wrapped state on one side of copper, so that the internal wrapping structure of the electromagnetic wire is realized, and the outside is the special-shaped wire (1) with a copper-coated structure.

As shown in fig. 1 and 3, an aluminum layer (4) is arranged on one half side surface of the electromagnetic wire and used for winding a later coil, and the later coil is subjected to material reduction treatment according to requirements to form a special-shaped wire (1). Because the price of aluminum is low, the material reduction cost is low, the material waste is less, and the difficulty in realizing the material reduction process is low. After the aluminum layer (4) is turned, the machined surface is easy to form aluminum oxide, and an insulating layer is naturally formed, so that re-insulating treatment is not needed in the later stage of the coil.

As shown in figures 1 and 4, the invention adopts the copper layer (5) wire with a certain section and the aluminum layer (4) wire to compound, so that the sectional area of the section of wire is enlarged, the resistance of the armature coil is reduced, and the heat dissipation efficiency is improved.

The low-resistance coil of the aluminum-clad copper electromagnetic wire and the motor stator are characterized in that:

the electromagnetic wire is wound into the inner edge (2) of the stator slot and is subjected to material reduction, so that more turns of wire can be wound into the slot;

the electromagnetic wire outside the stator slot (3) has a large cross section, so that the coil resistance is reduced, and the heat dissipation area is large.

One side of the copper special-shaped line (1) is at least provided with two planes.

The copper cladding is formed with an open ring outside the wire core of the aluminum layer (4), and the wrapping mode is C-shaped. . The copper layer (5) at one side is in a triangular special-shaped line (1) structure.

The aluminum layer (4) on one side of the electromagnetic wire is thinned, and the copper layer (5) of the special-shaped wire (1) with the triangular copper layer (5) is reserved and can be arranged in the trapezoid groove in a self-adaptive manner with the slotted hole.

As shown in fig. 5, the left schematic view is a cross-sectional view of the electromagnetic wire outside the stator slot (3) by adopting multi-layer lap winding. The right side schematic diagram is that after the material of the inner side (2) of the groove is reduced, the openings of the heat dissipation grooves (7) at the two ends of the aluminum layer (4) of the outer side (3) of the groove are exposed, and the forced end part side heat dissipation of ventilation can be realized.

After the aluminum layer (4) is partially thinned, aluminum oxide is generated, and an insulating layer is naturally formed.

The invention can effectively reduce the weight of the product with light weight, such as an aircraft, and is beneficial to improving the tension of the aircraft.

The aluminum in the electromagnetic wire comprises light conductive non-copper metal including lead, tin, lithium, magnesium or alloy.

The foregoing description of the preferred embodiment of the invention is not intended to limit the invention to the particular form disclosed, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

Claims (10)

1. The utility model provides a low resistance coil and motor stator of aluminium copper-clad electromagnetic wire which characterized in that:

the electromagnetic wire is wound into the slot inner edge of the stator slot and is thinned, so that more turns of wire can be wound into the slot;

the electromagnetic wire outside the stator slot has a large section reserved, so that the coil resistance is reduced.

2. The low resistance coil and motor stator of an aluminum-clad copper electromagnetic wire according to claim 1, wherein:

the electromagnetic wire is formed by processing aluminum coated copper.

3. The low resistance coil and motor stator of an aluminum-clad copper electromagnetic wire according to claim 1, wherein:

the electromagnetic wire is aluminum on one half side surface and copper on the other half side surface.

4. The low resistance coil and motor stator of an aluminum-clad copper electromagnetic wire according to claim 3, wherein:

one side of the copper is provided with at least two planes.

5. The low resistance coil and motor stator of an aluminum-clad copper electromagnetic wire according to claim 3, wherein:

and a radiating groove is formed in one side of the aluminum along the axial direction.

6. The low resistance coil and motor stator of an aluminum-clad copper electromagnetic wire according to claim 3, wherein:

the aluminum on one side is triangular and is used for later material reduction.

7. The low resistance coil and motor stator of an aluminum-clad copper electromagnetic wire according to claim 3, wherein:

the copper is coated outside the aluminum wire core, and an open ring is formed.

8. The low resistance coil and motor stator of an aluminum-clad copper magnet wire of claim 7, wherein:

the copper on one side is triangular.

9. The low resistance coil and motor stator of an aluminum-clad copper magnet wire of claim 7, wherein:

the aluminum on one side of the electromagnetic wire is reduced, and the copper with the triangle shape is reserved and can be arranged in the trapezoid groove in a self-adaptive manner with the slotted hole.

10. A motor stator, characterized by: the stator comprising the magnet wire of any one of claims 1-9.