Single-phase asynchronous motor stator structure and centrifugal pump

Abstract

The utility model relates to a stator structure of a single-phase asynchronous motor, which comprises a stator core (2), a stator insulating layer (1) and a winding part (3), the stator core (2) is wound with the winding part (3), the stator insulating layer (1) is arranged between the stator core (2) and the winding part (3), the stator core (2) is formed by welding two stator core assemblies with the same structure together, and the winding part (3) is wound with the stator insulating layer (1). The stator iron core assembly comprises an iron core yoke part (21) and iron core tooth parts (22), stator grooves are formed between the iron core yoke part (21) and two adjacent iron core tooth parts (22), the stator grooves are uniformly distributed on the stator iron core, and the stator grooves comprise stator inner grooves (23) and stator outer grooves (24). The single-phase asynchronous motor has the characteristics of reducing the length of the stator winding end part and the copper wire consumption, and realizing cost reduction and efficiency improvement of the single-phase asynchronous motor for the centrifugal pump.

Description

Technical Field

[0001] The utility model belongs to the technical field of centrifugal pumps, and particularly relates to a single-phase asynchronous motor stator structure and a centrifugal pump. Background Art

[0002] Since single-phase asynchronous motors have the advantages of low cost and high reliability, they are widely used in the field of centrifugal pump technology, such as general centrifugal pumps for household or farmland. At present, the input power of single-phase asynchronous motors for micro-power centrifugal pumps is usually 20W~700W, all of which are 2-pole motors and use distributed windings. Therefore, for single-phase asynchronous motors with a stator inner diameter value greater than the stator length value, there is a problem that the length of the end part of the stator winding is greater than the internal position length of the stator slot, which leads to the problem of large copper wire usage and low motor efficiency. Defects of the prior art: In the existing single-phase asynchronous motor technology for centrifugal pumps, the motor input power is usually 20W~700W, and the stators of the two-pole single-phase asynchronous motors all use distributed windings, and most of them have a situation where the stator inner diameter value is greater than the stator length value, which leads to the length of the end part of the stator winding being greater than the internal position length of the stator slot, and the end of the stator winding increases both the weight of the copper wire and the stator resistance, thereby increasing the stator copper loss, reducing the motor efficiency, and increasing the motor cost. Utility Model Content

[0003] The purpose of the utility model is to overcome the deficiencies of the prior art, provide a single-phase asynchronous motor stator structure and a centrifugal pump, reduce the length of the stator winding end and the amount of copper wire used, and achieve cost reduction and efficiency improvement of the single-phase asynchronous motor for the centrifugal pump.

[0004] The utility model provides the following technical solutions:

[0005] A single-phase asynchronous motor stator structure comprises a stator core 2, a stator insulation layer 1 and a winding portion 3, wherein the stator core 2 is wound with the winding portion 3, and the stator insulation layer 1 is provided between the stator core 2 and the winding portion 3, wherein the stator core 2 is formed by welding together two stator core components of the same structure, wherein the stator core component is semicircular, and the stator core component comprises a core yoke portion 21 and a core tooth portion 22, wherein stator slots are formed between the core yoke portion 21 and two adjacent core tooth portions 22, and wherein the stator slots are evenly distributed on the stator core, and wherein the stator slots comprise stator inner slots 23 and stator outer slots 24.

[0006] Optionally, the core tooth portion 22 includes a first core tooth portion 221 and a second core tooth portion 222, the first core tooth portion 221 and the second core tooth portion 222 are arranged at an interval, the second core tooth portion 222 is arranged at the connection of the stator core assembly, and the second core tooth portion 222 is provided with a welding positioning groove 25 and a welding positioning boss 26 for positioning and assembly.

[0007] Optionally, a welding groove 28 is spliced ​​between the outer ends of the two stator core assemblies, and the two stator core assemblies are welded into a stator core through the welding groove 28.

[0008] Optionally, a stator slot opening 27 is provided in the stator inner slot 23 near the center of the axis.

[0009] Optionally, the winding portion 3 passes through the slot portion of the stator inner slot 23 and is wound around the slot portion of the stator outer slot 24 via the core yoke portion 21 .

[0010] Optionally, the winding part 3 includes a main winding and a secondary winding, the main winding includes a first main winding 31, a second main winding 32, a third main winding 33 and a fourth main winding 34, and the first main winding 31, the second main winding 32, the third main winding 33 and the fourth main winding 34 are all wound with enameled wire in the stator inner slot and the stator outer slot of the core yoke according to the centralized winding; the secondary winding includes a first secondary winding 35, a second secondary winding 36, a third secondary winding 37 and a fourth secondary winding 38, and the secondary winding is the first secondary winding 35, the second secondary winding 36, the third secondary winding 37 and the fourth secondary winding 38, and the enameled wire is wound in the stator inner slot and the stator outer slot of the core yoke according to the centralized winding.

[0011] Optionally, the first main winding 31, the second main winding 32, the third main winding 33 and the fourth main winding 34 are wound with the same enameled wire diameter and number of turns, and the first secondary winding 35, the second secondary winding 36, the third secondary winding 37 and the fourth secondary winding 38 are wound with the same enameled wire diameter and number of turns.

[0012] Optionally, the first main winding 31, the second main winding 32, the third main winding 33 and the fourth main winding 34 are connected in series to form a stator main phase, and the first auxiliary winding 35, the second auxiliary winding 36, the third auxiliary winding 37 and the fourth auxiliary winding 38 and the capacitor are connected in series to form a stator auxiliary phase, and the stator main phase and auxiliary phase are connected to the mains in parallel.

[0013] Optionally, the stator insulation layer 1 includes an inner slot insulation layer and a stator outer slot insulation layer, the stator inner slot insulation layer is arranged on the inner side of the stator inner slot, and the stator outer slot insulation layer is arranged on the bottom and both sides of the stator outer slot.

[0014] The utility model also provides a centrifugal pump, comprising a single-phase asynchronous stand-alone machine, wherein the single-phase asynchronous motor comprises the single-phase asynchronous motor stator structure provided by any embodiment.

[0015] Compared with the prior art, the utility model has the following beneficial effects:

[0016] Aiming at the situation that the inner diameter of the motor stator of the two-pole single-phase asynchronous motor for micro-power centrifugal pump is greater than the stator height, the stator of the existing single-phase asynchronous motor for centrifugal pump is improved and perfected. The utility model adopts the concentrated winding method of the core yoke winding, and the stator slot of the stator core is designed with inner and outer slot structures, and the enameled wires at the ends of the main and auxiliary windings are wound in the inner and outer slots of the stator, replacing the cloth-type winding. The main and auxiliary phases are completely separated and there is no end crossing phenomenon, which greatly reduces the length of the main and auxiliary phase winding ends, greatly reduces the amount of copper wire, and thus achieves cost reduction and efficiency improvement of centrifugal pumps, greatly improves the insulation between the main and auxiliary phases, and thus increases the life of the motor. It solves the problem that the main and auxiliary windings of the distributed winding cross each other in the end area, which greatly reduces the insulation between the main and auxiliary phases and affects the life of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The utility model is a cross-sectional view of the motor stator of the single-phase asynchronous motor stator structure.

[0018] Figure 2 The utility model is a schematic diagram of the stator core of the single-phase asynchronous motor stator structure.

[0019] Figure 3 The utility model is a schematic diagram of a stator core assembly of a single-phase asynchronous motor stator structure.

[0020] Figure 4 The utility model is a motor stator wiring diagram of a single-phase asynchronous motor stator structure. DETAILED DESCRIPTION

[0021] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0022] Example 1

[0023] like Figure 1 As shown, a single-phase asynchronous motor stator structure includes a stator core 2, a stator insulation layer 1 and a winding portion 3. The stator core 2 is wound with the winding portion 3, and the stator insulation layer 1 is provided between the stator core 2 and the winding portion 3. The stator core 2 is composed of two stator core components of the same structure welded together.

[0024] like Figure 3As shown, the stator core assembly is semicircular, and the stator core assembly includes a core yoke 21 and a core tooth 22. Stator slots are formed between the core yoke 21 and two adjacent core tooth portions 22. The stator slots are evenly distributed on the stator core, and the stator slots include a stator inner slot 23 and a stator outer slot 24 ( Figure 2 ). Further, the stator core structure is specifically two stator core components spliced ​​together, and the stator core is divided into two stator core components for the convenience of winding. The number of stator slots of each stator core component is 4, and the number of stator slots of the stator core is 8 in total. Specifically, the stator core is made of ferrosilicon material.

[0025] Optionally, the core tooth portion 22 includes a first core tooth portion 221 and a second core tooth portion 222, the first core tooth portion 221 and the second core tooth portion 222 are arranged at an interval, the second core tooth portion 222 is arranged at the connection of the stator core assembly, and the second core tooth portion 222 is provided with a welding positioning groove 25 and a welding positioning boss 26 for completing the positioning assembly.

[0026] Optional, such as Figure 2 As shown, a welding groove 28 is spliced ​​between the outer ends of the two stator core assemblies, and the two stator core assemblies are welded into a stator core through the welding groove 28.

[0027] Optional, such as Figure 3 As shown, the stator inner slot 23 is provided with a stator slot 27 near the center of the axis, and the stator inner slot 23 is fan-shaped. The width of the core tooth portion A is d1, the width of the core yoke is d2, the width of the core tooth portion B is d4, and the width of the stator slot is d3. There are specific size requirements, 4mm≤1.2*d1≤d2≤10mm, d1=2*d4, 3mm≤d3≤6mm.

[0028] Optionally, the winding portion 3 passes through the slot portion of the stator inner slot 23 and is wound around the slot portion of the stator outer slot 24 via the core yoke portion 21 .

[0029] Optionally, the winding part 3 includes a main winding and a secondary winding, the main winding includes a first main winding 31, a second main winding 32, a third main winding 33 and a fourth main winding 34, and the enameled wires of the first main winding 31, the second main winding 32, the third main winding 33 and the fourth main winding 34 are wound in the stator inner slot 23 and the stator outer slot 24 of the core yoke according to centralized winding; the secondary winding includes a first secondary winding 35, a second secondary winding 36, a third secondary winding 37 and a fourth secondary winding 38, and the secondary windings are the enameled wires of the first secondary winding 35, the second secondary winding 36, the third secondary winding 37 and the fourth secondary winding 38 are wound in the stator inner slot 23 and the stator outer slot 24 of the core yoke according to centralized winding.

[0030] Optionally, the first main winding 31, the second main winding 32, the third main winding 33 and the fourth main winding 34 are wound with the same enameled wire diameter and number of turns, and the first auxiliary winding 35, the second auxiliary winding 36, the third auxiliary winding 37 and the fourth auxiliary winding 38 are wound with the same enameled wire diameter and number of turns. The centralized winding winding method is adopted between the stator inner slot and the stator outer slot, which can reduce the length of the main and auxiliary phase winding ends.

[0031] Optional, such as Figure 4 As shown, the first main winding 31, the second main winding 32, the third main winding 33 and the fourth main winding 34 are connected in series to form a stator main phase, and the first auxiliary winding 35, the second auxiliary winding 36, the third auxiliary winding 37 and the fourth auxiliary winding 38 and the capacitor are connected in series to form a stator auxiliary phase, and the stator main phase and auxiliary phase are connected in parallel to the mains.

[0032] Optionally, the stator insulation layer 1 includes an inner slot insulation layer and a stator outer slot insulation layer, the stator inner slot insulation layer is arranged on the inner side of the stator inner slot, and the stator outer slot insulation layer is arranged on the bottom and both sides of the stator outer slot.

[0033] The utility model also provides a centrifugal pump, comprising a single-phase asynchronous stand-alone machine, wherein the single-phase asynchronous motor comprises the single-phase asynchronous motor stator structure provided by any embodiment.

[0034] The utility model adopts the concentrated winding method of the core yoke, designs the stator inner slot and the stator outer slot through the stator slot of the stator core, and winds the main and auxiliary winding enameled wires in the stator inner slot and the stator outer slot, which greatly reduces the length of the stator main phase and stator auxiliary phase winding ends, greatly reduces the amount of copper wire used, and thus achieves cost reduction and efficiency improvement of the centrifugal pump. The stator main phase and stator auxiliary phase are completely separated without the phenomenon of end crossing, which can greatly improve the insulation between the main and auxiliary phases and thus increase the life of the motor.

[0035] In the description of this specification, the description with reference to the terms "in one embodiment", "in another embodiment", "exemplary" or "in a specific embodiment" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0036] Although the utility model has been described in detail above by means of general description, specific implementation methods and tests, it is obvious to those skilled in the art that some modifications or improvements can be made to the utility model. Therefore, these modifications or improvements made without departing from the spirit of the utility model are within the scope of protection claimed by the utility model.

Claims

1. A single-phase asynchronous motor stator structure, comprising a stator core (2), a stator insulation layer (1) and a winding portion (3), wherein the stator core (2) is wound with the winding portion (3), and a stator insulation layer (1) is provided between the stator core (2) and the winding portion (3), wherein: The stator core (2) is formed by welding two stator core components of the same structure together. The stator core component is semicircular and comprises a core yoke (21) and a core tooth (22). Stator slots are formed between the core yoke (21) and two adjacent core tooth portions (22). The stator slots are evenly distributed on the stator core. The stator slots comprise stator inner slots (23) and stator outer slots (24).

2. The single-phase asynchronous motor stator structure according to claim 1, characterized in that: The core tooth portion (22) comprises a first core tooth portion (221) and a second core tooth portion (222), wherein the first core tooth portion (221) and the second core tooth portion (222) are arranged at intervals, and the second core tooth portion (222) is arranged at a connection position of a stator core assembly, and the second core tooth portion (222) is provided with a welding positioning groove (25) and a welding positioning boss (26) for completing positioning assembly.

3. The stator structure of the single-phase asynchronous motor according to claim 1, characterized in that: A welding groove (28) is spliced ​​between the outer ends of the two stator core assemblies, and the two stator core assemblies are welded into a stator core through the welding groove (28).

4. The single-phase asynchronous motor stator structure according to claim 1, characterized in that: The stator inner slot (23) is provided with a stator slot opening (27) near the center of the axis.

5. The single-phase asynchronous motor stator structure according to claim 1, characterized in that: The winding part (3) passes through the slot part of the inner slot (23) of the stator and is wound around the slot part of the outer slot (24) of the stator via the iron core yoke part (21).

6. The single-phase asynchronous motor stator structure according to claim 5, characterized in that: The winding part (3) comprises a main winding and a secondary winding, wherein the main winding comprises a first main winding (31), a second main winding (32), a third main winding (33) and a fourth main winding (34), wherein the first main winding (31), the second main winding (32), the third main winding (33) and the fourth main winding (34) are all wound with enameled wires in the stator inner slot and the stator outer slot of the core yoke according to the centralized winding method; and the secondary winding comprises a first secondary winding (35), a second secondary winding (36), a third secondary winding (37) and a fourth secondary winding (38), wherein the first secondary winding (35), the second secondary winding (36), the third secondary winding (37) and the fourth secondary winding (38) are all wound with enameled wires in the stator inner slot and the stator outer slot of the core yoke according to the centralized winding method.

7. The single-phase asynchronous motor stator structure according to claim 6, characterized in that: The first main winding (31), the second main winding (32), the third main winding (33) and the fourth main winding (34) are wound with the same enameled wire diameter and number of turns, and the first secondary winding (35), the second secondary winding (36), the third secondary winding (37) and the fourth secondary winding (38) are wound with the same enameled wire diameter and number of turns.

8. The single-phase asynchronous motor stator structure according to claim 6, characterized in that: The first main winding (31), the second main winding (32), the third main winding (33) and the fourth main winding (34) are connected in series to form a stator main phase, the first secondary winding (35), the second secondary winding (36), the third secondary winding (37) and the fourth secondary winding (38) and a capacitor are connected in series to form a stator secondary phase, and the stator main phase and the secondary phase are connected in parallel to the mains.

9. The single-phase asynchronous motor stator structure according to claim 1, characterized in that: The stator insulation layer (1) comprises an inner slot insulation layer and a stator outer slot insulation layer, wherein the inner side of the stator inner slot is provided with the stator inner slot insulation layer, and the bottom and both sides of the stator outer slot are provided with the stator outer slot insulation layer.

10. A centrifugal pump, comprising a single-phase asynchronous unit, characterized in that: The single-phase asynchronous motor comprises the single-phase asynchronous motor stator structure according to any one of claims 1-9.

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