AC motor and AC stator core thereof

Abstract

The utility model relates to an AC motor and an AC stator core thereof, the AC stator core comprises an iron core main body, the outer side wall of the iron core main body is provided with a plurality of winding teeth, a winding groove is arranged between two adjacent winding teeth, the top of each winding tooth is provided with an arc-shaped pole shoe, and two sides of the pole shoe are provided with arc-shaped baffle plates; the outer side wall of the iron core body, the outer walls of the winding teeth, the lower surfaces of the baffles and the lower surfaces of the pole shoes are all covered with insulating layers, the outer side walls of the baffles are exposed, the outer side walls of the baffles and the outer side walls of the pole shoes are located on the same cylindrical face, and the length of the baffles is the same as that of the pole shoes. According to the utility model, the same electromotive force can be achieved with fewer turns of enameled wires. After the number of turns of the enameled wires is reduced, the manufacturing cost of the AC stator core is reduced, and the weight is also reduced.

Description

Technical Field

[0001] The utility model belongs to the field of motors, in particular to an AC motor and an AC stator core thereof. Background Art

[0002] The AC motor consists of a stator and a rotor. The stator core of an AC motor is as follows: Figure 1 As shown, it includes an iron core body 1, a plurality of winding teeth 2 are provided on the edge of the iron core body 1, a winding slot 3 is provided between two adjacent winding teeth 2, an arc-shaped pole shoe 4 is provided on the top of each winding tooth 2, and arc-shaped baffles 5 are provided on both sides of the pole shoe 4, and the baffles 5 are parallel to the pole shoe 4. Enameled wire needs to be wound around the winding teeth 2. Since the insulation layer of the enameled wire is relatively thin, in order to prevent leakage, a plastic insulation layer needs to be provided on the outer wall of the iron core body 1, the outer wall of the winding teeth 2, the lower surface of the baffle 5, etc. At present, the integral plastic insulation layer is usually formed by injection molding. The cross-sectional view of the stator core after injection molding is shown as follows: Figure 2 As shown, the outer wall of the core body 1, the outer wall of the winding teeth 2, the lower surface of the pole shoe 4, and the entire surface of the baffle 5 are covered with an insulating layer 6 made of plastic. Since the outer wall of the baffle 5 is also covered with the insulating layer 6, the outer diameter of the baffle 5 is smaller than the outer diameter of the pole shoe 4. After the stator core and the rotor are assembled, the stator core is located inside the rotor, and there is a large air gap between the baffle 5 and the inner arc of the rotor pole, and the magnetic flux is small. Therefore, it is necessary to set an enameled wire with a large number of turns on the winding column 2, and the cost of the stator core is high and the weight is also large. Utility Model Content

[0003] The technical problem to be solved by the present invention is to provide an AC motor and an AC stator core thereof, which can reduce the enameled wire provided on the winding pole 2 and reduce the cost and weight of the AC stator core.

[0004] To solve the above problems, the technical solution adopted by the present invention is: an AC stator core, comprising an iron core body, the outer wall of the iron core body is provided with a plurality of winding teeth, a winding groove is provided between two adjacent winding teeth, the top of each winding tooth is provided with an arc-shaped pole shoe, and the two sides of the pole shoe are provided with arc-shaped baffles; the outer wall of the iron core body, the outer wall of the winding teeth, the lower surface of the baffle and the lower surface of the pole shoe are all covered with an insulating layer, the outer wall of the baffle is exposed, and the outer wall of the baffle and the outer wall of the pole shoe are located on the same cylindrical surface, and the length of the baffle is the same as the length of the pole shoe.

[0005] Furthermore, the insulating layer includes a first insulating cover and a second insulating cover, each of the first insulating cover and the second insulating cover includes an integrally formed center sleeve, a winding tooth groove arranged on the outer wall of the center sleeve, and a baffle cover arranged on the top of the winding tooth groove. The center sleeve is arranged on the outer wall of the iron core body, the winding teeth are inserted into the winding tooth groove, and the baffle cover covers the lower surface of the baffle and the pole shoe.

[0006] Furthermore, an edge of the baffle cover is provided with an edge binding groove, and the edge binding groove covers the edge of the baffle.

[0007] Furthermore, the first insulating cover and the second insulating cover are plastic covers.

[0008] The AC motor comprises a rotor and a stator, wherein the stator adopts the AC stator core.

[0009] The beneficial effects of this utility model are as follows: 1. In conventional AC stator cores, the baffle is covered by an insulating layer, and magnetic flux is primarily conducted through the pole shoes. This utility model moves the outer wall of the baffle outward and exposes it, so that the outer wall of the baffle and the outer wall of the pole shoe are located on the same cylindrical surface. The baffle and the pole shoe conduct magnetic flux simultaneously, increasing the magnetic conduction area and boosting the magnetic flux.

[0010] 2. In the present invention, since the outer wall of the baffle is not provided with an insulating layer, the outer wall of the baffle and the outer wall of the pole shoe can be located on the same cylindrical surface. After the rotor and the stator are assembled, the radial air gap between the baffle and the inner arc of the rotor pole is reduced, and thus the magnetic flux will also increase.

[0011] The more enameled wire turns on the winding teeth, the greater the electromotive force. In the present invention, the magnetic flux of the AC stator core exceeds that of the prior art, given the same number of enameled wire turns. Therefore, the present invention can achieve the same electromotive force with fewer enameled wire turns. This reduction in enameled wire turns reduces the manufacturing cost and weight of the AC stator core. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a schematic diagram of an existing AC stator core before injection molding;

[0013] Figure 2 It is a cross-sectional schematic diagram of an existing AC stator core after injection molding;

[0014] Figure 3 This is a schematic diagram of the AC stator core of the present invention before an insulation layer is provided;

[0015] Figure 4 This is a schematic diagram of the AC stator core of the present invention after an insulation layer is provided;

[0016] Figure 5 is a schematic diagram of a first insulating cover and a second insulating cover;

[0017] Figure 6 This is a cross-sectional schematic diagram of the AC stator core of the present invention after an insulation layer is provided;

[0018] Figure 7 This is a schematic diagram of the AC motor of the utility model;

[0019] Figure 8 This is a schematic cross-sectional view of the AC motor of the present utility model;

[0020] Figure numerals: 1—core body; 2—winding teeth; 3—winding grooves; 4—pole shoes; 5—baffles; 6—insulating layer; 61—first insulating cover; 62—second insulating cover; 63—center sleeve; 64—winding tooth grooves; 65—baffle cover; 66—edge grooves. DETAILED DESCRIPTION

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0022] The AC stator core of the utility model is as follows: Figures 3 to 6 As shown, the core body 1 comprises a plurality of winding teeth 2 disposed on its outer wall. Winding slots 3 are provided between adjacent winding posts 2. Each winding tooth 2 is topped with an arcuate pole shoe 4, and arcuate baffles 5 are provided on either side of the pole shoe 4. The core body 1, winding teeth 2, and pole shoes 4 can be constructed using existing technology. The baffles 5 are used to position the enameled wire, ensuring it can be stably wound around the circumference of the winding teeth 2, which are positioned between the pole shoe 4 and the core body 1.

[0023] The outer wall of the core body 1, the outer wall of the winding teeth 2, the lower surface of the baffle 5 and the lower surface of the pole shoe 4 are all covered with an insulating layer 6. The outer wall of the baffle 5 is exposed, and the outer wall of the baffle 5 and the outer wall of the pole shoe 4 are located on the same cylindrical surface. The length of the baffle 5 is the same as the length of the pole shoe 4.

[0024] The baffle 5 is made of a magnetically conductive material, which can be the same material as the pole shoe 4. The outer wall of the baffle 5 is exposed, allowing it to conduct magnetism simultaneously with the pole shoe 4. In contrast, in conventional AC stator cores, both the inner and outer walls of the baffle 5 are covered by an insulating layer 6, relying primarily on the pole shoe 4 for magnetic conduction. Compared to conventional AC stator cores, the present invention has a larger magnetic conduction area, thereby increasing magnetic flux.

[0025] In a conventional AC stator core, the outer wall of the baffle 5 is provided with an insulating layer 6 of a certain thickness. The outer diameter of the insulating layer 6 matches the outer diameter of the pole shoe 4, thereby making the outer diameter of the baffle 5 smaller than that of the pole shoe 4. After assembly with the rotor, the distance from the baffle 5 to the inner arc of the rotor magnetic pole is greater than the distance from the pole shoe 4 to the rotor, resulting in a larger air gap between the baffle 5 and the inner arc of the rotor magnetic pole. In the present invention, since the outer wall of the baffle 5 does not require the insulating layer 6 and is exposed, the outer wall of the baffle 5 can be located on the same cylindrical surface as the outer wall of the pole shoe 4. The outer diameter of the baffle 5 is the same as that of the pole shoe 4. After the rotor is assembled outside the stator, the air gap between the baffle 5 and the inner arc of the rotor magnetic pole is even smaller, further increasing the magnetic flux.

[0026] The electromotive force is generated by the enameled wire wound around the winding bobbin 2. The greater the number of turns of the enameled wire, the greater the electromotive force. In the present invention, the magnetic flux is increased while the number of turns remains unchanged, so fewer enameled wire turns are required to achieve the required electromotive force. With fewer enameled wire turns, less enameled wire is consumed, thereby reducing the manufacturing cost and weight of the AC stator core, reducing the time required for winding the enameled wire, and improving production efficiency.

[0027] The insulation layer 6 of a conventional AC stator core is formed by injection molding, which requires placing the entire AC stator core into a mold of a specific structure and then injecting molten plastic into the mold. This is inefficient and difficult to achieve mass injection molding. In order to facilitate the setting of the insulating layer 6, the insulating layer 6 of the present invention includes a first insulating cover 61 and a second insulating cover 62. The first insulating cover 61 and the second insulating cover 62 both include an integrally formed center sleeve 63, a winding tooth groove 64 arranged on the outer wall of the center sleeve 63, and a baffle cover 65 arranged on the top of the winding tooth groove 64. The shape and size of the center sleeve 63 are adapted to the shape and size of the core body 1, the shape and size of the winding tooth groove 64 are adapted to the shape and size of the winding tooth 2, and the shape and size of the baffle cover 65 are adapted to the shape and size of the baffle 5 and the pole shoe 4. The center sleeve 63 is sleeved on the outer wall of the core body 1. The center sleeve 63 of the first insulating cover 61 and the center sleeve 63 of the second insulating cover 62 can cover the outer side of the core body 1. The winding tooth 2 is stuck in the winding tooth groove 64. The winding tooth groove 64 of the first insulating cover 61 and the winding tooth groove 64 of the second insulating cover 62 can cover the entire outer wall of the winding tooth 2, and the baffle cover 65 covers the lower surface of the baffle 5 and the pole shoe 4.

[0028] The first insulating cover 61 and the second insulating cover 62 can be plastic covers with a certain degree of elasticity. The two end surfaces of the AC stator core are respectively inserted into the first insulating cover 61 and the second insulating cover 62. The elasticity of the first insulating cover 61 and the second insulating cover 62 is utilized to ensure that the first insulating cover 61 and the second insulating cover 62 are stably mounted on the AC stator core.

[0029] The first insulating cover 61 and the second insulating cover 62 can be mass-produced, and are very convenient and quick to install, which is beneficial to improving the production efficiency of the AC stator core.

[0030] In order to improve the anti-leakage effect, the edge of the baffle cover 65 is provided with an edge-wrapping groove 66 , and the edge-wrapping groove 66 covers the edge of the baffle 5 .

[0031] The AC motor of the present utility model, such as Figure 7 and Figure 8 As shown, it includes a rotor 10 and a stator. Figures 3 to 6 The AC stator core shown in the figure. In the AC motor of the present invention, the air gap between the baffle 5 and the inner arc of the rotor magnetic pole is small, and the magnetic flux is increased.

[0032] A method for preparing an AC stator core comprises the following steps:

[0033] S1. Prepare an iron core body 1. The outer wall of the iron core body 1 is provided with a plurality of winding teeth 2. A winding groove 3 is provided between two adjacent winding teeth 2. An arc-shaped pole shoe 4 is provided on the top of each winding tooth 2. Arc-shaped baffles 5 are provided on both sides of the pole shoe 4.

[0034] S2. Prepare the first insulating cover 61 and the second insulating cover 62 according to the sizes of the core body 1, the winding teeth 2, the pole shoe 4 and the baffle 5; specifically, the first insulating cover 61 and the second insulating cover 62 can be prepared by a molding process, that is, first prepare a mold, and a cavity is provided inside the mold, and the shape and size of the cavity are the same as the shape and size of the first insulating cover 61 and the second insulating cover 62, and then inject molten plastic into the mold, and demold it after cooling.

[0035] S3. The first insulating cover 61 and the second insulating cover 62 are respectively put on the iron core body 1 from both ends, and the open ends of the first insulating cover 61 and the second insulating cover 62 are abutted, so that the first insulating cover 61 and the second insulating cover 62 cover the outer wall of the iron core body 1, the outer wall of the winding teeth 2, the lower surface of the baffle 5 and the lower surface of the pole shoe 4.

[0036] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. An AC stator core, comprising an iron core body (1), wherein the outer wall of the iron core body (1) is provided with a plurality of winding teeth (2), a winding slot (3) is provided between two adjacent winding teeth (2), an arc-shaped pole shoe (4) is provided at the top of each winding tooth (2), and arc-shaped baffles (5) are provided on both sides of the pole shoe (4); characterized in that: The outer wall of the core body (1), the outer wall of the winding teeth (2), the lower surface of the baffle (5) and the lower surface of the pole shoe (4) are all covered with an insulating layer (6); the outer wall of the baffle (5) is exposed, and the outer wall of the baffle (5) and the outer wall of the pole shoe (4) are located on the same cylindrical surface; the length of the baffle (5) is the same as the length of the pole shoe (4).

2. The AC stator core according to claim 1, wherein: The insulating layer (6) comprises a first insulating cover (61) and a second insulating cover (62), wherein the first insulating cover (61) and the second insulating cover (62) each comprise an integrally formed center sleeve (63), a winding tooth groove (64) arranged on the outer wall of the center sleeve (63), and a baffle cover (65) arranged on the top of the winding tooth groove (64); the center sleeve (63) is sleeved on the outer wall of the iron core body (1), the winding teeth (2) are inserted into the winding tooth groove (64), and the baffle cover (65) covers the lower surface of the baffle (5) and the pole shoe (4).

3. The AC stator core according to claim 2, wherein: The edge of the baffle cover (65) is provided with an edge-wrapping groove (66), and the edge-wrapping groove (66) covers the edge of the baffle (5).

4. The AC stator core according to claim 2, wherein: The first insulating cover (61) and the second insulating cover (62) are plastic covers.

5. An AC motor comprising a rotor (10) and a stator, characterized in that: The stator adopts the AC stator core according to claim 1, 2, 3 or 4.

Images