CN110571962A

CN110571962A - Flat wire motor stator

Info

Publication number: CN110571962A
Application number: CN201910869907.4A
Authority: CN
Inventors: 刘蕾; 朱标龙; 田旭; 张茨; 孙纯哲
Original assignee: Hefei JEE Power System Co Ltd
Current assignee: Hefei JEE Power System Co Ltd
Priority date: 2019-09-16
Filing date: 2019-09-16
Publication date: 2019-12-13
Anticipated expiration: 2039-09-16
Also published as: CN110571962B

Abstract

The invention discloses a flat wire motor stator which comprises a stator core and a stator winding, wherein the minimum unit of the stator winding is a single hairpin coil, two sides of the hairpin coil penetrate through a stator slot of the stator core, two ends of the stator winding are a hairpin end and a welding end respectively, and a three-phase outgoing line and a star point line of the stator winding are arranged on the welding end side. The winding scheme of the invention is mainly used for further reducing the size of the conductor so as to reduce the skin effect influence caused by high speed of the motor. Meanwhile, the winding scheme can avoid the problem that the welding end of the stator winding is difficult to realize end twisting due to excessive conductor layers, or the winding scheme can reduce the end twisting difficulty of the welding end of the stator winding, so that the manufacture of the hairpin winding is feasible. The flat wire winding enables the end twisting directions of every two adjacent layers of conductors at the welding end of the hairpin winding to be consistent through a special winding scheme, so that the purpose of reducing the difficulty of the end twisting process is achieved.

Description

flat wire motor stator

Technical Field

The invention relates to a motor winding, in particular to a flat wire motor stator.

background

the flat wire winding is a development direction of a new energy automobile driving motor, but the defect of flat wire is more obvious along with the increasing rotating speed of the motor. At present, the size of a flat wire winding conductor of a hairpin flat wire motor applied to the market is generally large, and the hairpin flat wire motor is not beneficial to further high-speed driving of the motor. If the size of the conductor is further reduced, the influence of the high-speed skin effect can be reduced, but the copper slot filling rate is reduced, the manufacturing process difficulty of the winding is increased, and even the end twisting of the welding end of the flat wire winding is difficult to realize.

Disclosure of Invention

The invention aims to: the utility model provides a flat wire motor stator, when reducing the conductor size of hairpin flat wire motor, can avoid increasing the tip of winding welded end and turn round the head degree of difficulty, make the manufacturing of hairpin winding have the feasibility.

The technical scheme of the invention is as follows:

The minimum unit of the stator winding is a single hairpin coil, two sides of the hairpin coil penetrate through a stator slot of the stator core, two ends of the stator winding are a hairpin end and a welding end respectively, and a three-phase outgoing line and a star point line of the stator winding are arranged on the welding end side.

Preferably, the single-phase winding of the stator winding is composed of N branches named A1, A2 and A3 … AN, and N is 2ⁿn natural numbers, each branch including an input end "+" and an output end "-"; by changing the series-parallel connection mode of the outgoing line, the single-phase winding of the stator winding can be transformed into 2^mAnd m is a natural number less than n.

preferably, each stator slot inner conductor of the stator core is sequentially named as L1, L2 … L2N-1 and L2N in the radial direction towards the center of a circle; the conductors of the 3 rd layer, the 4 th layer, the 7 th layer, the 8 th layer …, the 2N-1 th layer and the 2N th layer in the stator slot are bent along the same direction, and the conductors of the other layers are bent along the opposite direction.

preferably, the welding ends of the stator winding realize the electrical connection of the winding in a welding mode, and the welding rule of the stator winding is that conductors of 2 nd and 3 rd layers, 4 th and 5 th layers, 6 th and 7 th layers …, 2N-1 th layers and 2N-2 nd layers in stator slots are respectively welded together; the 1 st layer conductor and the 2N layer conductor are used as single outgoing lines.

Preferably, a single outgoing line of the 1 st layer conductor and a single outgoing line of the 2N th layer conductor are partially welded together through a connecting line, and a part of the outgoing line and the star point line are used as each phase outgoing line and a star point line of the stator winding.

Preferably, the hairpin coil adopts the flat wire coiling, in two adjacent hairpin coils: two end parts of one hairpin coil are bent leftwards, two end parts of the other hairpin coil are bent rightwards, one end part bent leftwards is intersected with one end part bent rightwards to form a coil repeating unit, and the coil repeating units are sequentially and regularly arranged together to form a stator winding according to the type of the coil repeating unit.

preferably, the middle part of the hairpin coil is triangular, and the top of the triangle is arranged into an S shape vertical to the vertical surface of the hairpin coil.

The invention has the advantages that:

The invention designs a winding scheme of a stator winding of a multilayer flat wire motor. The winding scheme is mainly used for further reducing the size of a conductor so as to reduce the skin effect influence caused by high-speed motor. Simultaneously, this winding scheme can avoid stator winding welded end to be difficult to realize the problem of tip wrench head because of the conductor number of piles is too much, perhaps this winding scheme can reduce the tip wrench head degree of difficulty of stator winding welded end.

Drawings

The invention is further described with reference to the following figures and examples:

FIG. 1 is a three-dimensional model of a flat wire motor stator;

FIG. 2 is a three-dimensional model of a flat wire motor stator;

FIG. 3 is an expanded view of one phase of the three phase stator winding;

FIG. 4 is a schematic view of a stator winding weld end twist;

FIG. 5 is a schematic view of a stator winding weld end weld;

FIG. 6 is a three-dimensional model of a stator winding coil repeating unit;

FIG. 7 is a two-dimensional schematic diagram of a stator winding coil repeat unit;

FIG. 8 is a schematic diagram of one leg of a stator winding deployment;

FIG. 9 is a schematic view of the connection of one branch of the stator winding;

Fig. 10 is a schematic view of a partial connection of one branch of the stator winding.

Detailed Description

As shown in fig. 1 and 2, the three-dimensional model of the flat wire motor stator comprises a stator core 1 and a stator winding, wherein the stator winding is divided into a hairpin end 2 and a welding end 3. The minimum unit of the stator winding is a single hairpin coil, and a three-phase outgoing line and a star point line of the winding are arranged on the welding end side. The stator winding of the embodiment is a three-phase winding, the number of stator slots is 48, and the number of conductors in each slot is 16.

Fig. 3 is a winding development diagram of a certain phase of a stator winding of a flat-wire motor, and a single-phase winding of the stator winding is composed of eight branches named as a1, a2, A3, a4, a5, a6, a7 and A8, wherein "+" represents an input end of each branch, and "-" represents an output end of each branch. By changing the series-parallel connection mode of the outgoing line, the single-phase winding of the stator winding can be diffracted into one branch circuit, two branch circuits and four branch circuits.

Fig. 4 is an illustration of a twisted joint at the weld end of a stator winding of a flat wire motor. The stator is characterized in that each slot conductor of the stator is sequentially named as L1, L2, … …, L15 and L16 in the radial direction towards the center of a circle. The conductors of the 3 rd layer, the 4 th layer, the 7 th layer, the 8 th layer, the 11 th layer, the 12 th layer, the 15 th layer and the 16 th layer in the stator slot are bent along the same direction, and the conductors of the other layers are bent along the opposite direction, as shown in fig. 3. It is based on this structural feature of the winding that the bending of the welded ends of the stator winding can be simplified, i.e. two layers of conductors can be bent as one layer of conductor.

fig. 5 is an illustration of the welding of the weld ends of the stator windings of a flat wire motor. The welding ends of the stator winding need to realize the electrical connection of the winding in a welding mode, and the welding rule of the stator winding is that the conductors of the 2 nd layer and the 3 rd layer, the 4 th layer and the 5 th layer, the 6 th layer and the 7 th layer, the 8 th layer and the 9 th layer, the 10 th layer and the 11 th layer, the 12 th layer and the 13 th layer, and the 14 th layer and the 15 th layer in the stator slot are respectively welded together. The layer 1 and the layer 16 conductors are used as single outgoing lines, part of the single outgoing lines need to be welded together through connecting lines, and part of the outgoing lines are used as three-phase outgoing lines and star point lines of the stator winding.

Fig. 6 and 7 show coil repeating units of stator windings of a flat wire motor, the stator windings being formed in such a manner that they are regularly arranged in sequence in the form of coil repeating units. The hairpin coil adopts the flat wire coiling, the middle part of hairpin coil is triangle-shaped, and the top of triangle-shaped sets to the S type perpendicular with the facade of hairpin coil, in two adjacent hairpin coils: two end parts of one hairpin coil are bent leftwards, two end parts of the other hairpin coil are bent rightwards, one end part bent leftwards is intersected with one end part bent rightwards to form a coil repeating unit, and the coil repeating units are sequentially and regularly arranged together to form a stator winding according to the type of the coil repeating unit.

fig. 8-10 show the connection mode of the stator winding of the flat wire motor. Fig. 8 is a developed view of a winding of one branch of a stator winding of a certain phase, and fig. 9 illustrates how the winding coil is connected to one branch in detail. Wherein, L1, L2, … …, L15, L16 respectively represent the number of layers in which the conductors in the slots are located, and the solid lines and the dotted lines respectively represent the overline connection of the straight conductor parts in the winding slots at the two ends of the stator core. As can be seen from the winding layout of fig. 8, the layer 16 conductor of the 43 th slot of the stator needs to be connected to the layer 1 conductor of the 2 nd slot of the stator to form a complete branch, but the crossover connection is not depicted in fig. 9. A complete branch is composed of both thick and thin lines in fig. 9. As can be seen from fig. 9, the starting position of one branch is at the 1 st layer L1 of the 1 st slot of the stator, and the branch sequentially crosses over to the 16 th layer L16 of the 43 nd slot of the stator according to the thick solid line and thick dotted line paths, then directly crosses over to the 1 st layer L1 of the 2 nd slot of the stator from the 16 th layer L16 of the 43 th slot of the stator, and finally crosses over to the 16 th layer L16 of the 44 th slot of the stator according to the thin solid line and thin dotted line paths, so as to complete the coil connection of one branch. Fig. 10 is a partial connection diagram of one branch of the stator winding.

The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose of the embodiments is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All modifications made according to the spirit of the main technical scheme of the invention are covered in the protection scope of the invention.

Claims

1. The flat wire motor stator comprises a stator core and a stator winding and is characterized in that the minimum unit of the stator winding is a single hairpin coil, two sides of the hairpin coil penetrate through a stator slot of the stator core, two ends of the stator winding are a hairpin end and a welding end respectively, and a three-phase outgoing line and a star point line of the stator winding are arranged on the welding end side.

2. The flat wire motor stator of claim 1, wherein the single phase winding of the stator winding is composed of N branches named a1, a2, A3 … AN, N being 2ⁿN natural numbers, each branch including an input end "+" and an output end "-"; by changing the series-parallel connection mode of the outgoing line, the single-phase winding of the stator winding can be transformed into 2^mAnd m is a natural number less than n.

3. the flat wire motor stator according to claim 2, wherein the conductors in each stator slot of the stator core are sequentially named L1, L2 … L2N-1 and L2N in the radial direction toward the center of the circle; the conductors of the 3 rd layer, the 4 th layer, the 7 th layer, the 8 th layer …, the 2N-1 th layer and the 2N th layer in the stator slot are bent along the same direction, and the conductors of the other layers are bent along the opposite direction.

4. The flat wire motor stator according to claim 3, wherein the welding ends of the stator winding are electrically connected by welding, and the stator winding is welded according to the rule that conductors of the 2 nd and 3 rd layers, the 4 th and 5 th layers, the 6 th and 7 th layers and the … nd and 2N-1 nd and 2 nd layers in the stator slot are respectively welded together; the 1 st layer conductor and the 2N layer conductor are used as single outgoing lines.

5. The flat wire motor stator of claim 4, wherein the single lead wires of the layer 1 and layer 2N conductors are partially welded together by connecting wires and partially serve as the respective phase lead wires and the star point wires of the stator winding.

6. The flat wire motor stator of claim 1, wherein the hairpin coils are wound with flat wires, and two adjacent hairpin coils are wound with flat wires, wherein: two end parts of one hairpin coil are bent leftwards, two end parts of the other hairpin coil are bent rightwards, one end part bent leftwards is intersected with one end part bent rightwards to form a coil repeating unit, and the coil repeating units are sequentially and regularly arranged together to form a stator winding according to the type of the coil repeating unit.

7. The flat wire motor stator according to claim 6, wherein the middle portion of the hairpin coil is triangular, and the top of the triangle is disposed in an S-shape perpendicular to the vertical face of the hairpin coil.