CN111200328A

CN111200328A - Four-way parallel flat wire motor winding structure

Info

Publication number: CN111200328A
Application number: CN201811380609.0A
Authority: CN
Inventors: 刘蕾; 朱标龙; 王锐
Original assignee: Hefei JEE Power System Co Ltd
Current assignee: Hefei JEE Power System Co Ltd
Priority date: 2018-11-20
Filing date: 2018-11-20
Publication date: 2020-05-26

Abstract

The invention discloses a four-way parallel flat wire motor winding structure which comprises a stator core, wherein a tooth part of the stator core is provided with a wire slot; the flat copper wires are embedded into corresponding wire slots according to a three-phase winding distribution method, and 48 wire slots are formed; each wire slot comprises a wire layer of 8 flat wires, the flat copper wires are sequentially stacked and embedded along the radial direction of the stator core to form a winding, and the wire layers are sorted in an ascending order along the direction far away from the center of a circle; each phase of the winding comprises different parallel branches; each branch has an output end and an input end; each parallel branch circuit sequentially enters and exits from adjacent wire layers between different wire grooves from the input end: the sequence of the embedded positions of the input end is 1, the sequence of the embedded positions of the output end is 32, and the sequence of the embedded positions is labeled. The structure can not generate circulating current, widens the selection space of the number of turns of the winding and the number of parallel branches in the design stage of the motor scheme, and is beneficial to optimizing the motor design scheme so as to better meet the requirements of motor performance and temperature rise.

Description

Four-way parallel flat wire motor winding structure

Technical Field

The invention relates to the field of motor structures, in particular to a four-way parallel flat wire motor winding structure.

Background

The flat wire motor winding is generally formed by connecting a plurality of square conductors in a welding manner. The number of square conductors in the iron core slot of the motor stator for the automobile is generally 2, 4, 6 or 8, and the number of parallel branches of the winding is generally 1 or 2. Therefore, the design flexibility of the number of winding turns and the number of parallel branches is poor, and the design scheme of the motor is not favorable to optimization.

The number of parallel branches of the flat wire winding in the prior art is generally 1 or 2, the winding mode of 1-way parallel connection and 2-way parallel connection is easy to eliminate circulating current, the winding process is relatively simple, but other adverse effects exist. For example, under the condition that the voltage of the direct-current bus of the motor is constant, the number of the parallel branches is small, so that the number of the conductors in each slot of the stator core is small, or the lamination thickness of the stator core is shortened. The small number of conductors in each slot of the stator core means that the size of the conductors is larger, the conductor skin effect is obvious at high rotating speed, the copper loss of the winding is obviously increased, and the temperature rise performance of the motor is difficult to meet the requirement. The stator core thickness shortens and means that the motor volume diminishes, and under the condition that the motor heat-sinking capability has not effectively been promoted, the temperature rise performance of motor is difficult to satisfy the requirement equally.

Disclosure of Invention

The invention aims to: on the premise of not introducing additional circulating current loss, the selection space of the number of parallel branches of the flat wire winding is widened, and the output performance and the temperature rise performance of the high-speed motor are further optimized.

The technical scheme of the invention is as follows: a four-way parallel flat wire motor winding structure comprises a stator core, wherein a tooth part of the stator core is provided with a wire slot; the flat copper wires are embedded into corresponding wire slots according to a three-phase winding distribution method, and 48 wire slots are formed; each wire slot comprises a wire layer of 8 flat wires, the flat copper wires are sequentially stacked and embedded along the radial direction of the stator core to form a winding, and the wire layers are sorted in an ascending order along the direction far away from the center of a circle; each phase of the winding comprises different parallel branches; each branch has an output end and an input end; each parallel branch circuit sequentially enters and exits from adjacent wire layers between different wire grooves from the input end: the sequence of the embedded positions of the input end is 1, the sequence of the embedded positions of the output end is 32, and the sequence of the embedded positions is labeled.

Preferably, the 48 wire slots are evenly divided into three phases; different parallel branches of the U phase are respectively represented by A/a, B/B, C/C and D/D; different parallel branches of the W phase are respectively represented by AA/AA, BB/BB, CC/CC and DD/DD; the different parallel branches of the V phase are respectively represented by AAA/AAA, BBB/BBB, CCC/CCC and DDD/DDD.

Preferably, the winding comprises a conventional coil, a layer-changing coil and a transposition coil.

Preferably, the first wire layer and the second wire layer constitute the conventional coil; the third wire layer and the fourth wire layer constitute the conventional coil; the fifth wire layer and the sixth wire layer constitute the conventional coil; the seventh wire layer and the eighth wire layer constitute the conventional coil.

Preferably, the second wire layer and the third wire layer constitute the layer-change coil; the fourth wire layer and the fifth wire layer form the layer changing coil; the sixth wire layer and the seventh wire layer constitute the layer change coil.

Preferably, the parallel branches in each phase are connected by a connecting conductor; the connection conductors are maintained in an insulated relationship.

The invention has the advantages that:

1. under a certain DC bus voltage platform, the high-speed skin effect of the conductors is reduced by increasing the number of the conductors in each slot of the stator core, and the temperature rise performance of the flat-wire motor under the high-speed working condition is improved.

2. The winding structure has no circulating current between parallel branches and between phases, and unnecessary winding loss can not be introduced.

3. The design of the four parallel branches widens the selection space of the number of turns of the winding and the number of the parallel branches in the design stage of the motor scheme, and is beneficial to optimizing the motor design scheme so as to better meet the requirements of motor performance and temperature rise.

Drawings

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

FIG. 1 is a three-phase winding connection diagram of the stator of the motor of the present invention;

FIG. 2 is a diagram of stator slots and conductors in the slots;

FIG. 3 is a three-dimensional model diagram of a stator;

FIG. 4 is a three-dimensional model of a stator from another perspective;

FIG. 5 is a block diagram of a transposition coil;

FIG. 6 is a structural view of a conventional coil

FIG. 7 is a structural diagram of a layer changing coil

FIG. 8 is a connection line diagram of the winding end outgoing line

FIG. 9 is a view showing a structure of a connecting conductor of U-phase, V-phase and W-phase parallel branches;

FIG. 10 is a schematic view of the installation of a conventional coil and a transposed coil;

FIG. 11 is a schematic view of the mounting of a layer change coil;

wherein: 1. a stator core; 21. welding ends of the windings; 22. a winding outlet end; 23. a conventional coil; 24. a layer changing coil; 25. and (4) a transposition coil.

Detailed Description

Example (b):

as shown in fig. 1-6, a winding structure of a four-way parallel flat-wire motor comprises a stator core, wherein a tooth part of the stator core is provided with a wire slot. The flat copper wires are embedded into corresponding wire slots according to a three-phase winding distribution method, and 48 wire slots are formed in the inner ring of the stator core. Fig. 1 is a connection diagram of three-phase winding wires of a motor stator. S1, S2 … … S47, and S48 denote stator core slot numbers.

All include the wire layer of 8 flat wires in every wire casing, the flat copper line forms the winding along stator core's radial range upon range of embedding in proper order, and the ascending preface formula of wire layer along keeping away from centre of a circle direction is sequenced. As shown in fig. 1, L1, L2 … … L7, L8 represent the number of layers in each wire slot, with the layers being sequentially spaced from the center of the wire in the radial direction.

Each phase of the winding comprises different parallel branches; each branch has an output and an input. Each parallel branch circuit sequentially enters and exits from adjacent wire layers between different wire grooves from the input end: the sequence of the embedded positions of the input end is 1, the sequence of the embedded positions of the output end is 32, and the sequence of the embedded positions is labeled. Wherein, 48 wire casings are evenly divided into three phases. Different parallel branches of the U phase are respectively represented by A/a, B/B, C/C and D/D; a1, B1, C1 and D1 respectively represent the input ends of the parallel branch of the U-phase winding, and a32, B32, C32 and D32 respectively represent the output ends of the parallel branch of the U-phase winding.

Different parallel branches of the W phase are respectively represented by AA/AA, BB/BB, CC/CC and DD/DD; AA1, BB1, CC1 and DD1 respectively represent the input ends of the parallel branch of the W-phase winding, and AA32, BB32, CC32 and DD32 respectively represent the output ends of the parallel branch of the W-phase winding

Different parallel branches of the V phase are respectively represented by AAA/AAA, BBB/BBB, CCC/CCC and DDD/DDD; AAA1, BBB1, CCC1, and DDD1 respectively represent the input terminals of the parallel branches of the V-phase winding, and AAA32, BBB32, CCC32, and DDD32 respectively represent the output terminals of the parallel branches of the V-phase winding.

Fig. 3 is a three-dimensional model of a stator with a winding iron core, wherein the stator winding is formed by connecting formed hairpin coils or single coils in a welding mode. The flat wire is embedded and wound on the stator core 1, the flat wire exposed on the upper side of the stator core is a winding welding end 21, and the flat wire exposed on the lower side of the stator core is a winding outlet end 22.

Wherein according to the three-phase division: uabcd is U phase composed of parallel branches A/a, B/B, C/C and D/D, Vabcd is V phase composed of parallel branches AAA/AAA, BBB/BBB, CCC/CCC and DDD/DDD, and Uabcd is W phase composed of parallel branches AA/AA, BB/BB, CC/CC and DD/DD.

Therefore, in the winding structure, the winding comprises a conventional coil 23, a layer-changing coil 24 and a transposition coil 25.

The first and second wire layers constitute a conventional coil L1L 2; the third and fourth wire layers constitute a conventional coil L3L 4; the fifth and sixth wire layers constitute a conventional coil L5L 6; the seventh and eighth wire layers constitute a conventional coil L7L 8.

The second wire layer and the third wire layer form a layer-changing coil L2L 3; the fourth wire layer and the fifth wire layer form a layer changing coil L4L 5; the sixth and seventh wire layers constitute a layer-changing coil L6L 7.

There are 4 types of transposition coils 25, in which the first layer of a part of the stator core slots constitutes a transposition coil. Besides realizing the electrical connection of the windings, the transposition coil also plays a role in eliminating circulating current between parallel circuits.

Since each parallel branch of the stator winding is relatively discrete, it needs to be connected by a connecting conductor 23, as shown in fig. 5. U23, V23 and W23 respectively represent connecting conductors of U-phase, V-phase and W-phase parallel branches, the connecting conductors are insulated from each other, and connecting points are formed by welding.

In summary, the winding structure is feasible in terms of technology. The realization that the flat wire winding is connected in parallel in 4 ways can increase the number of conductors in each slot of the stator core, reduce the conductor skin effect under the high rotating speed, and simultaneously ensure that the thickness of the stator core is not reduced too much, thereby improving the temperature rise performance of the motor on the premise of meeting the performance requirement of the motor.

The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical concepts disclosed herein be covered by the appended claims.

Claims

1. A four-way parallel flat wire motor winding structure comprises a stator core, wherein a tooth part of the stator core is provided with a wire slot; the flat copper wire is embedded into the corresponding wire slot according to the three-phase winding distribution method, and is characterized in that: 48 wire grooves are arranged; each wire slot comprises a wire layer of 8 flat wires, the flat copper wires are sequentially stacked and embedded along the radial direction of the stator core to form a winding, and the wire layers are sorted in an ascending order along the direction far away from the center of a circle; each phase of the winding comprises different parallel branches; each branch has an output end and an input end; each parallel branch circuit sequentially enters and exits from adjacent wire layers between different wire grooves from the input end: the sequence of the embedded positions of the input end is 1, the sequence of the embedded positions of the output end is 32, and the sequence of the embedded positions is labeled.

2. The winding structure of the four-way parallel flat wire motor according to claim 1, characterized in that: the 48 wire grooves are evenly divided into three phases; different parallel branches of the U phase are respectively represented by A/a, B/B, C/C and D/D; different parallel branches of the W phase are respectively represented by AA/AA, BB/BB, CC/CC and DD/DD; the different parallel branches of the V phase are respectively represented by AAA/AAA, BBB/BBB, CCC/CCC and DDD/DDD.

3. The winding structure of the four-way parallel flat-wire motor according to claim 1 or 2, characterized in that: the winding comprises a conventional coil, a layer-changing coil and a transposition coil.

4. The winding structure of the four-way parallel flat wire motor according to claim 3, characterized in that: the first wire layer and the second wire layer constitute the conventional coil; the third wire layer and the fourth wire layer constitute the conventional coil; the fifth wire layer and the sixth wire layer constitute the conventional coil; the seventh wire layer and the eighth wire layer constitute the conventional coil.

5. The winding structure of the four-way parallel flat wire motor according to claim 4, characterized in that: the second wire layer and the third wire layer form the layer-changing coil; the fourth wire layer and the fifth wire layer form the layer changing coil; the sixth wire layer and the seventh wire layer constitute the layer change coil.

6. The winding structure of the four-way parallel flat wire motor according to claim 1 or 5, characterized in that: the parallel branches in each phase are connected through a connecting conductor; the connection conductors are maintained in an insulated relationship.