Stator core and stator winding

Abstract

The invention relates to the technical field of motors, in particular to a stator core, which comprises a stator punching sheet, the stator punching sheet comprises a yoke part and a plurality of tooth parts positioned on the inner ring of the yoke part, a slot part is arranged between every two adjacent tooth parts, and the plurality of slot parts comprise a plurality of first slots and a plurality of second slots, the tooth portions are provided with first grooves and second grooves, the area of the first grooves is larger than that of the second grooves, the first grooves and the second grooves are distributed alternately, the opening width of the first grooves is equal to that of the second grooves, each tooth portion corresponds to a shoe portion, and the widths of the shoe portions are equal. According to the device, the area of the first slot is larger than that of the second slot on the premise of not changing the appearance volume of the motor, so that the total slot area of the motor stator is increased, the winding wire diameter can be increased on the condition of not changing the slot fullness rate, and the purpose of improving the efficiency of the motor can be achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and in particular to a stator core and a stator winding. Background Art

[0002] At present, single-phase asynchronous motors are widely used in the field of household appliances, but with the advancement of the national energy-saving and emission reduction policies, the disadvantage of low efficiency of single-phase asynchronous motors is becoming more and more obvious.

[0003] The size of an electric motor is generally fixed. How to improve the efficiency of the motor without changing the size of the motor has become an urgent problem to be solved. Summary of the invention

[0004] The purpose of the present invention is to solve the problems pointed out in the background technology and to propose a stator core.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A stator core comprises a stator punching sheet, wherein the stator punching sheet comprises a yoke portion and a plurality of tooth portions located on the inner circle of the yoke portion, a slot portion is provided between every two adjacent tooth portions, the plurality of slot portions comprise a plurality of first slots and a plurality of second slots, the area of ​​the first slots is greater than the area of ​​the second slots, the first slots and the second slots are alternately distributed, the opening width of the first slots is equal to the opening width of the second slots, each of the tooth portions corresponds to a boot portion, and the width of each of the boot portions is equal.

[0007] The stator core comprises a plurality of stator punching sheets, and the plurality of stator punching sheets are stacked along the axial direction thereof;

[0008] And / or the yoke is a ring structure, and the outer peripheral side of the ring structure is circular or polygonal.

[0009] The included angles between any two adjacent center lines of the grooves are equal.

[0010] Define the distance from one side of the first slot to the line between the midpoint of the tooth shoe and the center of the stator punching as L1, and the distance from one side of the second slot to the line between the midpoint of the tooth shoe and the center of the stator punching as L2, and L1<L2;

[0011] and / or define a groove depth of the first groove as D1, a groove depth of the second groove as D2, and D1>D2;

[0012] And / or define the arc radius of the bottom of the first groove as R1, the arc radius of the bottom of the second groove as R2, and R1>R2

[0013] 0.5*L2<L1<L2;

[0014] and / or 1.1*D2<D1<1.5*D2;

[0015] And / or define the distance from the first groove bottom arc radius R1 to the nearest outer polygon of the yoke as H1, the distance from the second groove bottom arc radius R2 to the nearest outer polygon of the yoke as H2, and H1≤H2.

[0016] There are two second grooves between every two adjacent first grooves, the shoe portion between the adjacent first grooves and the second grooves is an asymmetric structure, and the shoe portion between the adjacent two second grooves is a symmetric structure.

[0017] A stator winding, the stator core, the stator winding is a distributed winding structure, the stator winding includes a main phase winding M and an auxiliary phase winding A, the main phase winding M and the auxiliary phase winding A are arranged with an electrical angle difference of 180 degrees.

[0018] Define the number of turns of the main phase winding M as N1, the number of turns of the auxiliary phase winding A as N2, and N1 ≥ N2;

[0019] And / or define the wire diameter of the main phase winding M as Φ1, the wire diameter of the auxiliary phase winding A as Φ2, and Φ1≥Φ2.

[0020] The main phase winding M is defined as M1 and M2, and the auxiliary phase winding A is defined as A1 and A2, wherein M1 and A1 are respectively placed in the corresponding second slots, and M2 and A2 are placed together in the corresponding first slots.

[0021] The number of the first slots is 8, and the number of the second slots is 16, among which the M1 span is slots 1-6, 7-12, 13-18, 19-24, the A1 span is slots 4-9, 10-15, 16-21, 22-3, the M2 span is slots 2-5, 8-11, 14-17, 20-23, and the A2 span is slots 5-8, 11-14, 17-20, 23-2.

[0022] A stator core proposed in the present invention has the beneficial effect that, without changing the external volume of the motor, the area of ​​the first slot is greater than the area of ​​the second slot, thereby increasing the total slot area of ​​the motor stator, and further increasing the winding wire diameter without changing the slot fill rate, thereby achieving the purpose of improving the motor efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the stator punching sheet of the present invention;

[0024] Figure 2 It is a schematic diagram of the distribution and connection of the windings of the present invention;

[0025] Figure 3 Schematic diagram of the change of motor efficiency with L1 / L2;

[0026] Figure 4 This is a schematic diagram showing the change of motor efficiency with D1 / D2;

[0027] Figure 5 This is a noise comparison chart before and after the motor improvement.

[0028] In the figure: yoke 1, tooth 2, shoe 3, first slot 4, second slot 5. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0030] Reference Figure 1-Figure 5 A stator core includes a stator punching sheet, which includes a yoke 1, a plurality of tooth portions 2 located on the inner circle of the yoke 1, a slot portion between every two adjacent tooth portions 2, the plurality of slot portions including a plurality of first slots 4 and a plurality of second slots 5, the area of ​​the first slots 4 being greater than the area of ​​the second slots 5, the first slots 4 and the second slots 5 being alternately distributed, the opening width of the first slots 4 being equal to the opening width of the second slots 5, each tooth portion 2 corresponding to a boot portion 3, and the width of each boot portion 3 being equal.

[0031] Under the premise of not changing the external volume of the motor, the area of ​​the first slot 4 of the device is larger than the area of ​​the second slot 5, thereby increasing the total slot area of ​​the motor stator, and further increasing the winding wire diameter without changing the slot fill rate, thereby achieving the purpose of improving the motor efficiency.

[0032] As an implementation mode, the stator core includes a plurality of stator punching sheets, and the plurality of stator punching sheets are stacked along the axial direction thereof;

[0033] As another implementation, the stator core may also be formed in one piece.

[0034] And / or the yoke 1 is a ring structure, and the outer peripheral side of the ring structure is circular or polygonal, so as to better cope with motors of different shapes.

[0035] The angle between the center lines of any two adjacent slots is equal, and the center line angle of the traditional stator punching sheet is not changed, which facilitates the assembly of automated windings.

[0036] Define the distance from one side of the first slot 4 to the line between the midpoint of the tooth shoe and the center of the stator punching as L1, and the distance from one side of the second slot 5 to the line between the midpoint of the tooth shoe and the center of the stator punching as L2, and L1<L2. On the basis of not changing the overall size, the slot area of ​​the first slot 4 is increased by reducing L1;

[0037] and / or defining the groove depth of the first groove 4 as D1, the groove depth of the second groove 5 as D2, and D1>D2, and increasing the groove area of ​​the first groove 4 by increasing D1 without changing the overall size;

[0038] And / or define the radius of the bottom arc of the first groove 4 as R1, the radius of the bottom arc of the second groove 5 as R2, and R1>R2, and increase the groove area of ​​the first groove 4 by increasing R1 without changing the overall size

[0039] 0.5*L2<L1<L2;and / or 1.1*D2<D1<1.5*D2;reference Figure 3 , Figure 4 The device further limits the size relationship between L1 and L2, and the size relationship between D1 and D2, so that L1 and L2, D1 and D2 reach the optimal size ratio, so that the motor reaches the optimal efficiency, and at the same time, the motor noise is further reduced. Figure 5 shown.

[0040] And / or define the distance from the bottom arc radius R1 of the first groove 4 to the outer polygon of the yoke closest to it as H1, the distance from the bottom arc radius R2 of the second groove 5 to the outer polygon of the yoke closest to it as H2, and H1≤H2, without changing the overall size, the groove area of ​​the first groove 4 is increased by reducing H1.

[0041] refer to Figure 1 , Figure 2 There are two second grooves 5 between every two adjacent first grooves 4, the boot portion 3 between adjacent first grooves 4 and second grooves 5 is an asymmetric structure, and the boot portion 3 between two adjacent second grooves 5 is a symmetric structure. On the basis of not changing the size of the entire boot portion 3, part of the boot portion 3 is a symmetrical structure and part of the boot portion is an asymmetric structure, thereby further increasing the groove area of ​​the first groove 4.

[0042] A stator winding includes the above-mentioned stator core, the stator winding is a distributed winding structure, the stator winding includes a main phase winding M and an auxiliary phase winding A, and the main phase winding M and the auxiliary phase winding A are arranged 180 degrees apart from each other in electrical angle. Under the premise of ensuring that the slot filling rate remains unchanged, the motor performance, such as the motor efficiency, is improved.

[0043] Define the number of turns of the main phase winding M as N1, the number of turns of the auxiliary phase winding A as N2, and N1 ≥ N2;

[0044] And / or define the wire diameter of the main phase winding M as Φ1, the wire diameter of the auxiliary phase winding A as Φ2, and Φ1≥Φ2.

[0045] As an implementation method, the number of turns N1 of the main phase winding M is equal to the number of turns N2 of the auxiliary phase winding A, and the wire diameter Φ1 of the main phase winding M is equal to the wire diameter Φ2 of the auxiliary phase winding A. This can meet the requirements of the application environment that the motor can rotate both forward and reverse.

[0046] refer to Figure 2 , the main phase winding M is defined as M1 and M2, and the auxiliary phase winding A is defined as A1 and A2, wherein M1 and A1 are respectively placed in the corresponding second slot 5, and M2 and A2 are placed together in the corresponding first slot 4.

[0047] The number of the first slot 4 is 8, and the number of the second slot 5 is 16, among which the M1 span is slots 1-6, 7-12, 13-18, 19-24, the A1 span is slots 4-9, 10-15, 16-21, 22-3, the M2 span is slots 2-5, 8-11, 14-17, 20-23, and the A2 span is slots 5-8, 11-14, 17-20, 23-2. This winding method improves the performance of the motor while ensuring that the slot full rate remains unchanged.

[0048] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technical solution, conception, and design obtained by equivalent replacement or modification of the technical solution and inventive concept of the present invention by any technician familiar with the technical field within the technical scope disclosed by the present invention should be covered by the protection scope of the present invention.

Claims

1. A stator core, comprising a stator punching sheet, wherein the stator punching sheet comprises a yoke (1) and a plurality of teeth (2) located in an inner circle of the yoke (1), characterized in that: There is a groove portion between every two adjacent teeth (2), and the plurality of groove portions include a plurality of first grooves (4) and a plurality of second grooves (5). The area of ​​the first groove (4) is greater than the area of ​​the second groove (5). The first grooves (4) and the second grooves (5) are alternately distributed. The opening width of the first groove (4) is equal to the opening width of the second groove (5). Each tooth (2) corresponds to a boot portion (3), and the width of each boot portion (3) is equal.

2. A stator core according to claim 1, characterized in that: The stator core comprises a plurality of stator punching sheets, and the plurality of stator punching sheets are stacked along the axial direction thereof; And / or the yoke (1) is a ring structure, and the outer peripheral side of the ring structure is circular or polygonal.

3. The stator core according to claim 1, characterized in that: The included angles between any two adjacent center lines of the grooves are equal.

4. The stator core according to claim 1, characterized in that: The distance from one side of the first slot (4) to the line connecting the midpoint of the tooth shoe and the center of the stator punching sheet is defined as L1, and the distance from one side of the second slot (5) to the line connecting the midpoint of the tooth shoe and the center of the stator punching sheet is defined as L2, and L1<L2; and / or defining the groove depth of the first groove (4) as D1, the groove depth of the second groove (5) as D2, and D1>D2; And / or define the radius of the arc at the bottom of the first groove (4) as R1, the radius of the arc at the bottom of the second groove (5) as R2, and R1>R2.

5. A stator core according to claim 4, characterized in that: 0.5*L2<L1<L2; and / or 1.1*D2<D1<1.5*D2; And / or define the distance from the arc radius R1 of the bottom of the first groove (4) to the outer polygon of the yoke closest to it as H1, and the distance from the arc radius R2 of the bottom of the second groove (5) to the outer polygon of the yoke closest to it as H2, and H1≤H2.

6. A stator core according to any one of claims 1 to 5, characterized in that: There are two second grooves (5) between every two adjacent first grooves (4), the boot portion (3) between adjacent first grooves (4) and second grooves (5) is an asymmetric structure, and the boot portion (3) between adjacent two second grooves (5) is a symmetric structure.

7. A stator winding, characterized in that: It comprises the stator core as described in any one of claims 1 to 6, wherein the stator winding is a distributed winding structure, and the stator winding comprises a main phase winding M and an auxiliary phase winding A, and the main phase winding M and the auxiliary phase winding A are arranged with an electrical angle difference of 180 degrees.

8. The stator winding according to claim 7, characterized in that: Define the number of turns of the main phase winding M as N1, the number of turns of the auxiliary phase winding A as N2, and N1 ≥ N2; And / or define the wire diameter of the main phase winding M as Φ1, the wire diameter of the auxiliary phase winding A as Φ2, and Φ1≥Φ2.

9. A stator winding according to claim 7 or 8, characterized in that: The main phase winding M is defined as M1 and M2, and the auxiliary phase winding A is defined as A1 and A2, wherein M1 and A1 are respectively placed in the corresponding second slots (5), and M2 and A2 are placed together in the corresponding first slots (4).

10. A stator winding according to claim 9, characterized in that: The number of the first slots (4) is 8, and the number of the second slots (5) is 16, wherein the M1 spans are slots 1-6, 7-12, 13-18, 19-24, the A1 spans are slots 4-9, 10-15, 16-21, 22-3, the M2 spans are slots 2-5, 8-11, 14-17, 20-23, and the A2 spans are slots 5-8, 11-14, 17-20, 23-2.

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