Modular end winding connection structure for electric machines

Abstract

The application discloses a motor modular end winding connection structure, a straight conductor winding module and an end winding module; the straight conductor winding module comprises a straight conductor winding and a stator core; the straight conductor end of the straight conductor winding is embedded into a wire slot of the stator core; the end winding module comprises an end winding and an end winding positioning ring; the end winding is coaxially connected and installed onto the end winding positioning ring; the end winding and the straight conductor winding are assembled in the coaxial direction through a locking sleeve assembly, and the straight conductor end of the end winding is butted with the straight conductor end of the straight conductor winding; the locking sleeve assembly comprises a locking sleeve male end and a locking sleeve female end; the locking sleeve male end is sleeved outside a straight conductor fixing ring and is fixed with the end surface of the stator core; the locking sleeve female end is sleeved outside the outer ring of the end winding positioning ring and is clamped with the locking sleeve male end. The motor winding is divided into the straight conductor winding module and the end winding module, and the complexity of the process can be reduced and the production efficiency can be improved through the butt joint of the connection structure.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of motor winding arrangement, and particularly relates to a motor modularized end winding connection structure. BACKGROUND

[0002] With the development of new energy motor technology, motors can be divided into round copper wire and flat copper wire (hairpin motor) according to winding copper wire topology structure. Compared with traditional round copper wire motors, hairpin motors can significantly improve the effective copper fullness, reduce the winding end height and enhance the heat dissipation performance. However, the hairpin motor end conductor needs to be welded to realize winding closure, and the completion of welding often needs to design a specific tooling, which leads to the increase of motor winding assembly process, increases the production cost and is difficult to realize mass production. SUMMARY

[0003] The technical scheme of the present application is to provide a motor modularized end winding connection structure, which aims at the problem that the hairpin motor needs to be welded in a complex process and a specific welding tooling needs to be designed, which leads to the increase of production cost and is difficult to realize mass production.

[0004] A motor modularized end winding connection structure comprises a straight conductor winding module and an end winding module.

[0005] The straight conductor winding module comprises a straight conductor winding and a stator core. The straight conductor winding comprises a straight conductor end embedded in a wire slot of the stator core and a bent end exposed at an end of the stator core. The straight conductor end of the straight conductor winding is embedded in the wire slot of the stator core.

[0006] The end winding module comprises an end winding and an end winding positioning ring. The end winding is coaxially connected and installed on the end winding positioning ring. The end winding also comprises a straight conductor end and a bent end.

[0007] The end winding and the straight conductor winding are assembled in a coaxial direction through a locking sleeve assembly, and the straight conductor end of the end winding is butted with the straight conductor end of the straight conductor winding.

[0008] The locking sleeve assembly comprises a locking sleeve male end and a locking sleeve female end. The locking sleeve male end is sleeved outside the straight conductor fixing ring and is fixedly connected with the end surface of the stator core. The locking sleeve female end is sleeved outside the outer ring of the end winding positioning ring and is assembled with the locking sleeve male end.

[0009] Preferably, the straight conductor winding module comprises a straight conductor fixing ring. The straight conductor end of the straight conductor winding is embedded in the assembly hole of the straight conductor fixing ring.

[0010] Preferably, the end winding module comprises an end winding fixing ring. The straight conductor end of the end winding is embedded in the assembly hole of the end winding fixing ring.

[0011] Preferably, the male end of the locking sleeve comprises a post arranged on the outer surface thereof; the female end of the locking sleeve comprises a helical groove arranged on the inner surface thereof; the assembly of the male end of the locking sleeve and the female end of the locking sleeve is realized by the cooperation of the post and the helical groove.

[0012] Preferably, the inner surface of the male end of the locking sleeve comprises a recess; the outer surface of the end winding positioning ring comprises a protrusion; the assembly of the end winding positioning ring and the male end of the locking sleeve is realized by the cooperation of the recess and the protrusion.

[0013] Preferably, the outer surface of the end winding positioning ring comprises a radially protruding outer edge; the inner surface of the female end of the locking sleeve comprises a radially protruding inner edge; the female end of the locking sleeve is sleeved on the end winding positioning ring and is axially assembled by the inner edge clamping on the outer edge.

[0014] Preferably, the straight conductor end of the end winding is arranged with an assembly groove, and the straight conductor end of the end winding and the straight conductor end of the straight conductor winding are positioned and assembled by the assembly groove.

[0015] Preferably, the straight conductor fixing ring and the end winding fixing ring are made of insulating and flame-retardant materials.

[0016] The present application has the following advantages:

[0017] 1. Based on the modularization idea of motor winding, the motor winding is divided into a straight conductor winding module and an end winding module, which are connected and assembled, so that the excellent characteristics of the motor can be ensured, and the complexity of the process is reduced and the production efficiency is improved.

[0018] 2. The end winding locking structure of the present application is easy to disassemble and assemble, which can effectively avoid unnecessary welding processes.

[0019] 3. The terminal locking structure is used for fixation, which is convenient to disassemble, and the number of parallel branches of the motor can be changed by only replacing the end winding module, so that the line load and the high-speed weak magnetic interval of the motor can be changed, and the motor winding structure can be easily replaced. BRIEF DESCRIPTION OF DRAWINGS

[0020] The present application will be further described below in combination with the drawings and embodiments:

[0021] Figure 1 It is a front view of the motor modularization end winding connection structure;

[0022] Figure 2 It is an axial explosion view of the motor modularization end winding connection structure;

[0023] Figure 3 It is a front view of the male end of the locking sleeve;

[0024] Figure 4 is the front view of the female end of the locking sleeve;

[0025] Figure 5 is the sectional view of the female end of the locking sleeve in A-A section;

[0026] Figure 6 is the side view of the end winding positioning ring;

[0027] wherein each reference sign is: 1, straight conductor winding; 2, stator core; 3, straight conductor fixing ring; 4, male end of the locking sleeve; 41, column end; 42, groove; 5, female end of the locking sleeve; 51, helical groove; 6, end winding positioning ring; 61, protruding end; 7, end winding fixing ring; 8, end winding. DETAILED DESCRIPTION

[0028] Example 1:

[0029] A motor modular end winding connection structure, comprising: a straight conductor winding module and an end winding module. Wherein:

[0030] The straight conductor winding module comprises a straight conductor winding 1, a stator core 2, and a straight conductor fixing ring 3, and the straight conductor winding 1 is embedded on the stator core 2. The straight conductor winding 1 comprises a straight conductor end embedded in a wire slot on the stator core and a bent end exposed at the end of the stator core, wherein the straight conductor end of the straight conductor winding 1 is embedded in the wire slot of the stator core 2. The stator core 2 is also provided with a straight conductor fixing ring 3 on the end face, and the straight conductor end of the straight conductor winding 1 is embedded in the assembly hole of the straight conductor fixing ring 3.

[0031] The end winding module comprises an end winding 8, an end winding positioning ring 6, and an end winding fixing ring 7, and the end winding 8 is coaxially connected and installed on the end winding positioning ring 6. Specifically, the end winding 8 also comprises a straight conductor end and a bent end, and the straight conductor end of the end winding 8 is embedded in the assembly hole of the end winding fixing ring 7, and the end winding fixing ring 7 is fixedly connected with the end winding positioning ring 6.

[0032] The end winding 8 and the straight conductor winding 1 are assembled in the coaxial direction by the locking sleeve assembly, and the straight conductor end of the end winding 8 is connected correspondingly with the straight conductor end of the straight conductor winding 1.

[0033] The locking sleeve assembly comprises a male end 4 of the locking sleeve and a female end 5 of the locking sleeve, the male end 4 of the locking sleeve is sleeved outside the straight conductor fixing ring 3 and is fixedly connected with the end face of the stator core 2, and the female end 5 of the locking sleeve is sleeved outside the outer ring of the end winding positioning ring 6 and is assembled with the male end 4 of the locking sleeve.

[0034] Specifically, the male end 4 of the locking sleeve includes a post end 41 arranged on the outer surface thereof, and the female end 5 of the locking sleeve includes a helical groove 51 arranged on the inner surface thereof, and the assembly of the male end 4 of the locking sleeve and the female end 5 of the locking sleeve is achieved by the cooperation of the post end 41 and the helical groove 51.

[0035] The inner surface of the male end 4 of the locking sleeve includes an indented groove 42, and the outer surface of the end winding positioning ring 6 includes a protruding end 61, and the assembly of the end winding positioning ring 6 and the male end 4 of the locking sleeve is achieved by the cooperation of the groove 42 and the protruding end 61.

[0036] The outer surface of the end winding positioning ring 6 is formed with a radially protruding outer edge, and the inner surface of the female end 5 of the locking sleeve is formed with a radially protruding inner edge, and the female end 5 of the locking sleeve is assembled on the end winding positioning ring 6 and is axially assembled by being clamped on the outer edge by the inner edge.

[0037] Embodiment 2:

[0038] The straight conductor winding module includes the straight conductor winding 1 and the stator core 2, and the straight conductor end of the straight conductor winding 1 is embedded in the core groove of the stator core 2, and the two are formed as a whole by die forming. When embedding the wire, the wire can be placed in the stator core groove with insulation paper one by one, or a special tool is designed to fix all the straight conductor windings 1 as a whole and placed in the stator core groove at the same time.

[0039] The straight conductor end of the end winding 8 is provided with an assembly groove, which can be tightly matched with the straight conductor end of the straight conductor winding 1.

[0040] The connection structure between the straight conductor winding module and the end winding module further includes the straight conductor fixing ring 3, the male end 4 of the locking sleeve, the female end 5 of the locking sleeve, the end winding positioning ring 6, and the end fixing ring 7.

[0041] The straight conductor fixing ring 3 and the end fixing ring 7 are made of materials with good insulation performance and good support capacity, and at the same time meet the flame retardant performance of vertical combustion V-0 level and horizontal combustion H level, which can effectively fix the conductor ends of the two module windings.

[0042] One end of the male end 4 of the locking sleeve is fixed on the end face of the stator core 2 by a screw, and the outer circle of the male end 4 of the locking sleeve is provided with a protruding cylindrical post end 41, which cooperates with the helical groove 51 of the inner circle of the female end 5 of the locking sleeve to lock the end winding module 8. The inner circle of the male end 4 of the locking sleeve is provided with a square groove 42, which cooperates with the square protruding end 61 on the outer circle of the end winding positioning ring 6 to position the end winding module.

[0043] The end winding positioning ring 6 is provided with an outer edge at one end, which can limit and support the inner edge of the female end 5 of the locking sleeve when the two are matched.

[0044] Embodiment 3:

[0045] The present scheme is described by using a 36-slot 8-pole structure, and the number of conductors in each slot is 2. The motor stator is divided into straight conductor winding modules, locking sleeve assemblies and end winding modules. The installation steps are as follows:

[0046] 1) Fix the male end 4 of the locking sleeve on the stator core 2;

[0047] 2) Put the single conductor on the straight conductor winding module into the slot of the stator core with insulation paper one by one, and fix the straight conductor fixing ring 3 to the end of the stator core 2;

[0048] 3) Put the single conductor of the end winding module into the end fixing ring 7 one by one, and put on the end winding positioning ring 6;

[0049] 4) Put the female end 5 of the locking sleeve into the end winding positioning ring 6;

[0050] 5) Align the protruding end 61 on the end winding positioning ring 6 with the rectangular groove 42 on the male end 4 of the locking sleeve, and press them together;

[0051] 6) Align the column end on the male end 5 of the locking sleeve with the spiral groove 51 on the female end 5 of the locking sleeve, and tighten the female end 5 of the locking sleeve. The installation is completed.

[0052] The embodiments of the present application are only illustrative of the principles and effects of the present application, and are not used to limit the present application. Any person skilled in the art can modify or change the above embodiments without departing from the spirit and scope of the present application. Therefore, all equivalent modifications or changes made by those skilled in the art without departing from the disclosed spirit and technical thought of the present application should be covered by the claims of the present application.

Claims

1. An electrical machine modular end winding connection structure, comprising: The application relates to a straight conductor winding module and an end winding module; the straight conductor winding module comprises a straight conductor winding and a stator core; the straight conductor end of the straight conductor winding is embedded into a wire slot of the stator core; the straight conductor winding comprises a straight conductor end and a bent end; the end winding module comprises an end winding and an end winding positioning ring; the end winding is coaxially connected and installed onto the end winding positioning ring; the end winding comprises a straight conductor end and a bent end; the end winding and the straight conductor winding are coaxially assembled through a locking sleeve assembly; the straight conductor end of the end winding is butted with the straight conductor end of the straight conductor winding; the locking sleeve assembly comprises a locking sleeve male end and a locking sleeve female end; the locking sleeve male end is sleeved outside the straight conductor fixing ring and is fixedly connected with the end surface of the stator core; the locking sleeve female end is sleeved outside the outer ring of the end winding positioning ring and is assembled with the locking sleeve male end through clamping; the straight conductor winding module comprises a straight conductor fixing ring; the straight conductor end of the straight conductor winding is embedded into an assembly hole arranged on the straight conductor fixing ring; the end winding module comprises an end winding fixing ring; the straight conductor end of the end winding is embedded into an assembly hole arranged on the end winding fixing ring; the locking sleeve male end comprises a column end arranged on the rotary outer surface thereof; the locking sleeve female end comprises a spiral groove arranged on the rotary inner surface thereof; the assembly and butt joint of the locking sleeve male end and the locking sleeve female end are realized through the cooperation of the column end and the spiral groove; the rotary inner surface of the locking sleeve male end comprises an inward recess; the rotary outer surface of the end winding positioning ring comprises a protruding end; the assembly and butt joint of the end winding positioning ring and the locking sleeve male end are realized through the cooperation of the recess and the protruding end; the rotary outer surface of the end winding positioning ring is formed with a radially protruding outer edge; the rotary inner surface of the locking sleeve female end is formed with a radially protruding inner edge; the locking sleeve female end is sleeved on the end winding positioning ring and is axially assembled through the clamping of the inner edge on the outer edge; the straight conductor end of the end winding is arranged with an assembly groove; the straight conductor end of the end winding is positioned and butted with the straight conductor end of the straight conductor winding through the assembly groove; the straight conductor fixing ring and the end winding fixing ring are prepared from insulating and flame-retardant materials. ​ ​ ​ ​ ​ ​ ​ ​ 2. A modular end winding connection structure for an electrical machine according to claim 1, characterized in that: ​ 3. The modular end winding connection structure of claim 1, wherein: ​ 4. The modular end winding connection structure of claim 1, wherein: ​

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