CN210183119U

CN210183119U - Motor winding capable of reducing copper loss

Info

Publication number: CN210183119U
Application number: CN201921522814.6U
Authority: CN
Inventors: Zhongwei Lin; 林中尉
Original assignee: Suzhou Amtf Robots Co ltd
Current assignee: Suzhou Amtf Robots Co ltd
Priority date: 2019-09-12
Filing date: 2019-09-12
Publication date: 2020-03-24
Anticipated expiration: 2029-09-12

Abstract

This patent provides a resistance is little, can reduce the motor winding of copper consumption, and it forms with the wire welding that passes the iron core wire casing, and the resistivity of the tip wire outside the iron core wire casing is less than the resistivity that is located the middle wire of iron core wire casing. This patent is different from conventional winding, and this patent adopts the resistivity of tip wire to be less than the technique that is located the intermediate conductor, has reduced the resistance of tip wire to motor winding's resistance has been reduced, thereby motor efficiency can improve.

Description

Motor winding capable of reducing copper loss

Technical Field

This patent relates to motor windings, especially flat wire windings for flat wire motors.

Background

When current flows through a motor winding, the current generates heat due to the resistance of the winding, so that the current is lost, and the winding is mostly made of copper materials, so that the current is called copper loss, and is also called copper loss, and is active loss. High efficiency motors are the direction of motor development today, and the best way to improve motor efficiency is to increase the slot fill ratio, i.e. to reduce the resistance of the windings to reduce the winding heating losses (i.e. copper losses) of the motor. In order to improve the slot filling rate, the flat wire winding becomes one of the main directions of the current motor, and the technology improves the space utilization rate and increases the sectional area of copper by using a rectangular wire, thereby reducing the resistance of the winding. However, the space of the core slots is limited, and the resistance cannot be reduced any more after the core slots are completely filled with copper (corresponding to a slot fill rate of 100%, that is, the core slots are completely filled with copper wires).

Disclosure of Invention

The purpose of this patent is to provide a resistance is little, can reduce the motor winding of copper consumption.

This patent reduce motor winding of copper loss to the wire welding that passes the iron core wire casing forms, is less than the resistivity that is located the middle wire of iron core wire casing at the outside resistivity of tip wire of iron core wire casing.

As a further improvement to the motor winding described above, the cross-sectional area of the end conductor is greater than the cross-sectional area of the center conductor, so that the end conductor has a lower resistivity than the center conductor.

As a further improvement to the above-described motor winding, the end leads are rectangular in cross-section. Because the end part lead needs welding and twisting, the rectangular section welding and twisting are more convenient to operate, and the manufacturability of preparation, welding and the like is improved.

As a further improvement of the motor winding, the middle part of the section of each middle lead is thick, the two sides of the section of each middle lead are thin, or the middle part of the section of each middle lead is thin, the two sides of the section of each middle lead are thick, and a heat dissipation channel is formed between the thin parts of the adjacent middle leads. Therefore, the heat dissipation channel is arranged in the iron core, and the heat dissipation requirements of the iron core and the wires are met. For example, the cross section of the middle wire is rhombic or approximately rhombic, trapezoidal or approximately trapezoidal.

As a further improvement to the motor winding described above, the cross-sectional shape of the end leads is different from the cross-sectional shape of the center lead, so that the resistivity of the end leads is less than that of the center lead.

The invention has the beneficial effects that: the wires that make up the motor windings are partly inside the core slots (this part is called the middle wire) and partly outside the core (this part is called the end wire). In the conventional winding, the cross-sectional shape and size of the wire are not changed, that is, the resistivity of the wire is the same whether the wire is an end wire or a middle wire. If the half-turn lead of the winding is regarded as a middle lead and three resistors formed by two end leads are connected in series, the resistivity of the three leads of the conventional winding is equal.

This patent is different from conventional winding, and this patent adopts the resistivity of tip wire to be less than the technique that is located the intermediate conductor, has reduced the resistance of tip wire to motor winding's resistance has been reduced, thereby motor efficiency can improve.

The middle wire part positioned in the iron core is limited by the space of the iron core wire slot, and the wire filling rate cannot be increased after reaching a certain degree, and the end wire part positioned outside the iron core can adopt a method that the sectional area of the end wire is larger than that of the middle wire in the iron core because the external space of the iron core is larger, so that the resistance of the winding is reduced. As shown in fig. 1, the sectional area of the end lead 1, 3 of this patent is larger than the middle lead 2, the resistivity of the end lead is smaller than that of the middle lead, and compared with the conventional winding (made of the lead with the same sectional shape and size as the middle lead in this patent and the same material as the lead in this patent), the equivalent resistance R1 and R3 of the end lead of this patent is smaller than that of the end lead of the conventional winding, so that the winding resistance is smaller, and the motor efficiency is improved.

In addition, even if the end portion conducting wire and the middle conducting wire are the same in cross section area, different cross section shapes can be adopted, so that the resistivity of the end portion conducting wire is smaller than that of the middle conducting wire, and the resistance of the motor winding is reduced on the whole.

The resistance of the winding is reduced by methods such as unequal sections of the conducting wires. This patent does not limit the cross-sectional shape of the end conductor, and it may be the same as or different from the cross-sectional shape of the middle conductor. But because the end leads need to be soldered or twisted, a rectangular cross-section is more suitable.

This patent does not do the restriction to the cross sectional shape of intermediate conductor, but if needs the inside heat dissipation channel that has of iron core, the cross-section of intermediate conductor can adopt the thin shape of the thick both sides in middle part (like rhombus, trapezoidal etc.), has formed heat dissipation channel between the thin portion in both sides of adjacent intermediate conductor like this, perhaps, the cross-section of intermediate conductor can adopt the thick shape of the thin both sides in middle part, has formed heat dissipation channel between the thin portion in middle part of adjacent intermediate conductor like this, in order to satisfy the iron core, the heat dissipation requirement of wire.

Drawings

FIG. 1 is a schematic diagram of a half turn wire of a winding;

FIG. 2 is a schematic diagram of an equivalent circuit of a half turn wire of a winding;

FIG. 3 is a schematic winding unwinding diagram;

FIG. 4 is a schematic view (rectangular cross section) of two adjacent intermediate conductors;

FIG. 5 is a schematic view of two adjacent intermediate conductors (approximately diamond shaped cross section);

FIG. 6 is a schematic view of two adjacent intermediate conductors (trapezoidal cross section);

fig. 7 is a schematic view of two adjacent intermediate wires (thick in the middle of the cross-section and thin on both sides).

Detailed Description

Referring to fig. 1 and 3, the motor winding for reducing copper loss is formed by welding wires 5 penetrating through an iron core wire slot, wherein the wires comprise end wires 1 and 3 outside the iron core wire slot and a middle wire 2 inside the iron core wire slot.

The end conductors have the same or different cross-sectional shape as the center conductor, and the cross-sectional area of the end conductors is the same or different from that of the center conductor, but the resistivity of the end conductors 1, 3 is less than that of the center conductor 2. For example, the cross-sectional area of the end wire is larger than the cross-sectional area of the middle wire, such that the end wire has a lower resistivity than the middle wire.

The end leads 1, 3 are rectangular in cross-section.

The cross-section of the intermediate conductor 2 may be rectangular (see fig. 4), but a non-rectangular cross-section between which the heat dissipation channel 4 can be formed is preferably employed. For example, referring to fig. 7, the cross-section of the middle lead has a thicker middle portion 21 and thinner sides 22, and a heat dissipation channel 4 is formed between the thinner portions of the two sides of the adjacent middle leads; alternatively, referring to fig. 5 and 6, the cross-section 21 of the intermediate conductors is thinner in the middle and thicker on both sides 22, and the thinner in the middle of adjacent intermediate conductors form heat dissipation channels 4 therebetween for fluid to flow through the windings to cool the windings. The cross section of the middle wire in fig. 5 is approximately diamond-shaped, and the cross section of the middle wire in fig. 6 is trapezoidal. The space is formed between the non-rectangles of the middle wire, and the wire at the end part outside the iron core wire slot is rectangular, so that the welding performance is good.

In addition, even if the end portion lead and the middle lead have the same sectional area and different sectional shapes, the motor which needs internal heat dissipation is also beneficial. The central conductors within the core may take on a non-rectangular cross-section (e.g., approximately diamond or trapezoidal or other shapes as shown in fig. 5, 6, and 7, with heat-dissipating channels formed between the conductors for fluid flow through the windings to cool the windings), with a rectangular cross-section being more suitable if the end conductors require welding or twisting. Thus, the heat dissipation requirement can be met, and the end connection requirement can be met.

The iron core has the significance that the winding is manufactured by adopting different sections of the inner and outer leads of the iron core, so that the resistance of the winding is further reduced, or the manufacturability is improved. The specific shape of the cross section of the wire, the size of the area difference of the cross section of the wire, the structure of the winding, the iron core, the groove shape and the like do not influence the protection scope of the patent claims.

Claims

1. The motor winding for reducing copper loss is formed by welding a wire penetrating through an iron core wire slot, and is characterized in that: the resistivity of the end wire outside the iron core wire slot is less than the resistivity of the middle wire inside the iron core wire slot.

2. A winding for an electrical machine according to claim 1, wherein: the cross-sectional area of the end conductor is greater than the cross-sectional area of the middle conductor so that the end conductor has a lower resistivity than the middle conductor.

3. A winding for an electrical machine according to claim 1, wherein: the cross section of the end lead is rectangular.

4. A winding for an electrical machine according to claim 1, wherein: the middle part of the section of the middle lead is thick, the two sides are thin, or the middle part of the section of the middle lead is thin, the two sides are thick, and a heat dissipation channel is formed between the thin parts of the adjacent middle leads.

5. An electrical machine winding as claimed in claim 4, wherein: the section of the middle lead is rhombic and trapezoidal.

6. A winding for an electrical machine according to claim 1, wherein: the cross-sectional shape of the end conductor is different from the cross-sectional shape of the middle conductor so that the end conductor has a lower resistivity than the middle conductor.