Alternating current motor, alternating current stator core and preparation method

Abstract

The invention relates to an alternating-current motor, an alternating-current stator core and a preparation method. The alternating-current stator core comprises an iron core body, a plurality of winding teeth are arranged on the outer side wall of the iron core body, a winding groove is formed between every two adjacent winding teeth, an arc-shaped pole shoe is arranged at the top of each winding tooth, and arc-shaped baffles are arranged on the two sides of each pole shoe; 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, and the outer side walls of the baffles and the outer side walls of the pole shoes are located on the same cylindrical surface. According to the invention, 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 invention belongs to the field of motors, and in particular to an AC motor, an AC stator core and a preparation method 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 arranged at the edge of the iron core body 1, a winding groove 3 is arranged between two adjacent winding teeth 2, an arc-shaped pole shoe 4 is arranged on the top of each winding tooth 2, and arc-shaped baffles 5 are arranged 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 on the winding teeth 2. Since the insulation layer of the enameled wire is relatively thin, in order to prevent leakage, a layer of plastic insulation layer needs to be arranged 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 and other parts. At present, the overall plastic insulation layer is usually formed by injection molding. The cross-sectional view of the stator core after injection molding is shown in FIG. 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. Summary of the invention

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

[0004] In order to solve the above problems, the technical solution adopted by the present invention is: an AC stator core, including 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, an arc-shaped pole shoe is provided on the top of each winding tooth, and arc-shaped baffles are provided on both sides of the pole shoe; the outer wall of the iron core body, the outer wall of the winding tooth, 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.

[0005] Furthermore, the insulating layer includes a first insulating cover and a second insulating cover, each of which 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 side wall of the 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 method for preparing the AC stator core comprises the following steps:

[0010] S1. Prepare an iron core body, wherein 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, an arc-shaped pole shoe is provided at the top of each winding tooth, and arc-shaped baffles are provided on both sides of the pole shoe;

[0011] S2. Prepare a first insulating cover and a second insulating cover according to the sizes of the core body, the winding teeth, the pole shoes and the baffle;

[0012] S3. The first insulating cover and the second insulating cover are respectively mounted on the core body from both ends of the core body, and the opening ends of the first insulating cover and the second insulating cover are abutted against each other, so that the first insulating cover and the second insulating cover cover the outer wall of the core body, the outer wall of the winding teeth, the lower surface of the baffle and the lower surface of the pole shoe.

[0013] Furthermore, in step S2, a molding process is used to prepare the first insulating cover and the second insulating cover.

[0014] The beneficial effects of the present invention are as follows: 1. In the conventional AC stator core, the baffle is covered by an insulating layer and the magnetism is mainly conducted through the pole shoe. In the present invention, the outer wall of the baffle is moved outward and exposed, 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 magnetism at the same time, the magnetism conduction area is increased, and the magnetic flux is increased.

[0015] 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, so the magnetic flux will also increase.

[0016] The more turns of enameled wire on the winding teeth, the greater the electromotive force. In the present invention, under the condition of the same number of turns of enameled wire, the magnetic flux of the AC stator core of the present invention exceeds the magnetic flux of the prior art, so the present invention can achieve the same electromotive force with fewer turns of enameled wire. After the number of turns of enameled wire is reduced, the manufacturing cost of the AC stator core is reduced, and the weight is also reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the existing AC stator core before injection molding;

[0018] Figure 2 It is a cross-sectional schematic diagram of an existing AC stator core after injection molding;

[0019] Figure 3 It is a schematic diagram of the AC stator core of the present invention before an insulating layer is provided;

[0020] Figure 4 It is a schematic diagram of the AC stator core of the present invention after an insulation layer is provided;

[0021] Figure 5 is a schematic diagram of a first insulating cover and a second insulating cover;

[0022] Figure 6 It is a cross-sectional schematic diagram of the AC stator core of the present invention after an insulating layer is provided;

[0023] Figure 7 is a schematic cross-sectional view of the AC motor of the present invention;

[0024] 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

[0025] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0026] The AC stator core of the present invention is as follows Figures 3 to 6 As shown, it includes an iron core body 1, a plurality of winding teeth 2 are arranged on the outer wall of the iron core body 1, a winding groove 3 is arranged between two adjacent winding columns 2, an arc-shaped pole shoe 4 is arranged on the top of each winding tooth 2, and arc-shaped baffles 5 are arranged on both sides of the pole shoe 4. The iron core body 1, the winding teeth 2 and the pole shoe 4 can adopt the existing technology. The baffle 5 is used to position the enameled wire to ensure that the enameled wire can be stably wound on the circumference of the winding teeth 2 arranged between the pole shoe 4 and the iron core body 1.

[0027] 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.

[0028] The baffle 5 is made of a magnetic conductive material, which can be the same material as the pole shoe 4. The outer wall of the baffle 5 is exposed, and can be magnetically conductive together with the pole shoe 4. The inner and outer walls of the baffle 5 of the conventional AC stator core are both covered by an insulating layer 6, and the magnetic conductivity is mainly achieved by the pole shoe 4. Compared with the conventional AC stator core, the present invention has a larger magnetic conductive area, so the magnetic flux is increased.

[0029] The outer wall of the baffle 5 of the conventional AC stator core is provided with an insulating layer 6, which has a certain thickness, and the outer diameter of the insulating layer 6 is adapted to the outer diameter of the pole shoe 4, so that the outer diameter of the baffle 5 is smaller than the outer diameter of the pole shoe 4. After being assembled 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, and there is a large 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 need to be provided with an 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, and the outer diameter of the baffle 5 is the same as the outer diameter 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 smaller, thereby further increasing the magnetic flux.

[0030] The electromotive force is generated by the enameled wire wound on the winding pole 2. The more 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 only fewer turns of the enameled wire are needed to achieve the required electromotive force. After the number of turns of the enameled wire is reduced, less enameled wire is consumed, so the manufacturing cost of the AC stator core is reduced, the weight is also reduced, the time required for winding the enameled wire is also reduced, and the production efficiency is improved.

[0031] The insulating layer 6 of the conventional AC stator core is formed by injection molding, which requires the entire AC stator core to be placed in a mold of a specific structure, and then molten plastic is injected into the mold, which is inefficient and difficult to be mass-produced. 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, 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 side 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.

[0032] The first insulating cover 61 and the second insulating cover 62 can be plastic covers with a certain 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 sleeved on the AC stator core.

[0033] 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.

[0034] 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 .

[0035] The AC motor of the present invention, Figure 7 As shown, it includes a rotor 10 and a stator, the stator is 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.

[0036] The method for preparing an AC stator core comprises the following steps:

[0037] S1. Prepare 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 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, and arc-shaped baffles 5 are provided on both sides of the pole shoe 4;

[0038] 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 shoes 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, 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.

[0039] S3. The first insulating cover 61 and the second insulating cover 62 are respectively mounted on the core body 1 from both ends of the core body 1, and the opening ends of the first insulating cover 61 and the second insulating cover 62 are abutted against each other, so that the first insulating cover 61 and the second insulating cover 62 cover 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.

[0040] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An AC stator core, comprising a core body (1), wherein the outer wall of the 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 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.

2. The AC stator core according to claim 1, characterized in that: 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) both 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), wherein the center sleeve (63) is sleeved on the outer wall of the 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, characterized in that: 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, characterized in that: 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 described in claim 1, 2, 3 or 4.

6. The method for preparing the AC stator core according to claim 1, 2, 3 or 4, characterized in that: The following steps are involved: S1. Prepare 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 groove (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); S2. Prepare a first insulating cover (61) and a second insulating cover (62) according to the sizes of the core body (1), the winding teeth (2), the pole shoes (4) and the baffle (5); S3. The first insulating cover (61) and the second insulating cover (62) are respectively sleeved on the iron core body (1) from both ends of the iron core body (1), and the opening ends of the first insulating cover (61) and the second insulating cover (62) are abutted against each other, 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).

7. The method for preparing an AC stator core according to claim 6, characterized in that: In step S2, a first insulating cover (61) and a second insulating cover (62) are prepared by a molding process.

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