Motors and compressors

Abstract

The present invention provides a motor and compressor, wherein the stator comprises: a stator yoke having an annular structure; and a plurality of stator teeth disposed on the inner ring of the stator yoke. When the stator teeth are cross-sectioned in a direction perpendicular to the axis of the stator yoke, the contour line of the stator tooth on the side facing away from the stator yoke in the cross section comprises a first segment and a second segment connected to each other, the second segment comprising a first end and a second end, the first end being connected to the first segment, the second end facing away from the first segment, and the second segment gradually moving away from the center of the stator yoke from the first end to the second end. When the stator provided by the present invention is in use, a rotor is disposed within the inner ring of the stator yoke, and the rotor rotates from the second segment to the first segment. When the rotor rotates into the stator teeth, the initial air gap is increased, thereby reducing the local saturation effect, weakening the distortion of the air gap magnetic field, reducing the harmonic content of the motor, improving the motor efficiency, and reducing torque fluctuations.

Description

Technical Field

[0001] The present invention relates to the field of motors, and in particular to a motor and a compressor. Background Art

[0002] As DC technology continues to gain traction in electrical appliances and automotive motors, the energy efficiency requirements for unidirectional motors, such as fans, compressors, and motors, are becoming increasingly stringent. Consequently, centralized winding motors are being used in more applications. However, current motor applications still face significant torque fluctuations and low efficiency. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems existing in the existing or improved technology.

[0004] To this end, a first aspect of the present invention provides a stator.

[0005] A second aspect of the present invention provides a motor.

[0006] A third aspect of the present invention provides a compressor.

[0007] In view of this, according to a first aspect of the present invention, a stator is proposed, comprising: a stator yoke, the stator yoke being an annular structure; a plurality of stator teeth, arranged on the inner ring of the stator yoke, wherein the stator teeth are cross-sectioned in a direction perpendicular to the axis of the stator yoke. In the cross-section, the contour line of the stator tooth on the side away from the stator yoke includes a first segment and a second segment connected to each other, the second segment includes a first end and a second end, the first end is connected to the first segment, the second end is away from the first segment, and the second segment gradually moves away from the center of the stator yoke from the first end to the second end.

[0008] The stator proposed in the present invention comprises a stator yoke and stator teeth. The stator yoke is annular in structure, with multiple stator teeth arranged on the inner ring of the stator yoke. Furthermore, when the stator teeth are cross-sectioned perpendicular to the axis of the stator yoke, the outline of the stator tooth facing away from the stator yoke in the cross section includes a first segment and a second segment, wherein the first segment is connected to the second segment, the second segment includes a first end, the first end is connected to the first segment, and the second segment also includes a second end, the second end facing away from the first segment. The second segment gradually moves away from the center of the stator yoke from the first end to the second end.

[0009] Specifically, when in use, a rotor is arranged inside the inner ring of the stator yoke, and the rotation direction of the rotor is from the second section to the first section. Since the second end of the second section is far away from the center of the stator yoke, when the rotor rotates into the stator tooth, the initial air gap is increased, and the increase in the air gap will increase the magnetic circuit voltage drop on the air gap side, and then the magnetic saturation of the second section of the stator tooth will be greatly reduced, thereby reducing the local saturation effect, weakening the distortion of the air gap magnetic field, reducing the harmonic content of the motor, improving the motor efficiency, and reducing the torque fluctuation.

[0010] Moreover, since the first section gradually moves away from the center of the stator yoke from the first end to the second end, the air gap gradually becomes smaller when the rotor rotates, that is, the magnetic saturation gradually increases, avoiding the increase in radial force caused by the cliff-like change of the air gap, thereby ensuring that the motor has sufficient output power and reducing the noise of the motor.

[0011] In addition, the stator in the above technical solution proposed by the present invention may also have the following additional technical features:

[0012] In the above technical solution, further, the stator tooth includes: a stator tooth body, which is arranged on the inner ring of the stator yoke; a stator pole shoe, which is arranged on the end of the stator tooth body away from the stator yoke, and the first section and the second section are arranged on the side of the stator pole shoe away from the stator tooth body.

[0013] In this technical solution, the stator teeth include a stator tooth body and a stator pole shoe, and the stator tooth body is arranged between the stator yoke and the stator pole shoe.

[0014] In any of the above technical solutions, further, the first section is arc-shaped, and the first section is concentric with the stator yoke.

[0015] In this technical solution, the first section is arc-shaped, and the first section is concentric with the stator yoke, thereby ensuring that the air gap between the rotor and the stator is consistent at the position of the first section, so that the air gap magnetic density at the first section is the same, thereby increasing the efficiency of the motor.

[0016] In any of the above technical solutions, the stator pole shoe further includes: a first side connected to the first section and located on a side of the first section facing away from the second section; a second side connected to the second section and located on a side of the second section facing away from the first section, wherein the stator tooth is cross-sectioned in a direction perpendicular to the axis of the stator yoke. In the cross-section, the length of the first side is th, the length of the second side is th1, the intersection of the extension line of the first section and the extension line of the second side is point D, the length from the second end to point D is th2, and th≥th1+th2,

[0017] In this technical solution, a first side edge and a second side edge are provided on both sides of the first section and the second section of the stator pole shoe, respectively. A cross section of the stator tooth is made in a direction perpendicular to the axis of the stator yoke. In the cross section, the length of the first side edge is th, the length of the second side edge is th1, and extension lines are drawn for the first section and the second side edge, respectively. The extension lines intersect at point D, and the length from the second end of the second section to point D is th2, where th≥th1+th2. The degree of magnetic pressure reduction is limited to a reasonable range, the air gap is avoided to be too large, and the power output of the motor is limited to a more optimal range. In addition, the dimensions of the first side and the second side are rationalized to compensate for the effect of the increased air gap in the second section and improve the output power of the motor.

[0018] In any of the above technical solutions, further, the stator teeth are cross-sectioned in a direction perpendicular to the axis of the stator yoke. In the cross-section, the stator pole shoe occupies a circumferential angle of βs on the stator yoke, and the first segment occupies a circumferential angle of βs on the stator yoke. The second section occupies an angle of γ2 on the circumference of the stator yoke, where

[0019] In this technical solution, by The lengths of the first and second sections are limited, that is, the overall distance of the second section where the air gap changes is limited, and the part where the air gap changes is limited within a range, thereby rationalizing the change of the air gap. This ensures that the air gap in the first section where the magnetic saturation is not obvious has good air gap magnetic density while reducing the magnetic saturation, thereby ensuring the output power of the motor while reducing the torque fluctuation.

[0020] In any of the above technical solutions, further, the stator yoke includes: a plurality of stator units, the plurality of stator units are sequentially connected to form a ring structure to form the stator yoke, wherein any one of the plurality of stator units is connected to a stator tooth.

[0021] In this technical solution, the stator yoke has a plurality of stator units, and one stator unit is connected to a stator tooth, thereby ensuring the structural uniformity of the entire stator.

[0022] In any of the above technical solutions, further, the stator teeth are cross-sectioned in a direction perpendicular to the axis of the stator yoke. In the cross-section, a stator unit occupies a circumferential angle of the stator yoke of αs, the number of stator poles is ps, and the stator pole shoe occupies a circumferential angle of the stator yoke of βs. βs=kαs, where 0.5<k<1.

[0023] In this technical solution, by limiting the circumferential angle occupied by the stator pole shoes, the overall range of the air gap is limited, thereby indirectly limiting the range of the second segment of the air gap variation. This reduces magnetic saturation while ensuring good air gap flux density in the first segment, where magnetic saturation is less pronounced. This reduces torque fluctuations while ensuring the motor's output power. Furthermore, this limits the length of the slot, which affects motor losses, thereby limiting motor losses to an optimal range and improving motor efficiency.

[0024] In any of the above technical solutions, further, the second segment is a curved segment or a straight line segment.

[0025] In this technical solution, the second segment can be a curved segment or a straight segment.

[0026] According to a second aspect of the present invention, the present invention proposes a motor, comprising: a stator as proposed in any one of the above technical solutions; a rotor, arranged in the inner ring of the stator yoke, and the rotation direction of the rotor is from the second section to the first section.

[0027] The motor proposed in the present invention includes the stator proposed in any one of the above technical solutions, and therefore has all the beneficial effects of the stator proposed in any one of the above technical solutions, which will not be listed one by one here.

[0028] In the above technical solution, further, when the first segment is an arc segment and the width between the second end of the second segment of the stator and the intersection of the extension line of the first segment of the stator and the extension line of the second side of the stator is th2, th2 is less than 2 times the width of the air gap formed between the rotor and the first segment of the stator.

[0029] In this technical solution, the change in the air gap of the second section is limited to avoid excessive change in the air gap of the second section, thereby ensuring the output power of the motor while reducing the magnetic saturation at the second section.

[0030] According to a third aspect of the present invention, the present invention proposes a compressor, comprising: a stator as proposed in any one of the above technical solutions; or a motor as proposed in any one of the above technical solutions.

[0031] The compressor proposed in the present invention includes a stator as proposed in any one of the above technical solutions, and therefore has all the beneficial effects of the motor proposed in any one of the above technical solutions, which will not be listed one by one here.

[0032] Additional aspects and advantages of the invention will become apparent from the description which follows, or may be learned by practice of the invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments with reference to the accompanying drawings, in which:

[0034] Figure 1 A schematic structural diagram of a motor provided by one embodiment of the present invention is shown;

[0035] Figure 2 A schematic structural diagram showing an area corresponding to a stator unit in a motor provided by an embodiment of the present invention;

[0036] Figure 3 A schematic diagram showing the structure of the motor in Related Art 1 is shown;

[0037] Figure 4 A schematic structural diagram showing part of the motor in Related Art 2;

[0038] Figure 5 A schematic structural diagram showing part of the motor in Related Art 3;

[0039] Figure 6 A diagram showing the relationship between the motor output torque and motor efficiency in a motor provided by one embodiment of the present invention and in Related Technologies 1, 2, and 3;

[0040] Figure 7 A relationship diagram between the motor torque fluctuation coefficient and the output power of the motor provided by one embodiment of the present invention and related technologies 1, 2, and 3 is shown.

[0041] in, Figure 1 and Figure 2 The corresponding relationship between the reference numerals and component names is as follows:

[0042] 100 motor, 110 stator, 112 stator yoke, 1122 stator unit, 114 stator tooth, 1142 stator tooth body, 1144 stator pole shoe, 1146 first section, 1148 second section, 1150 first end, 1152 second end, 1154 first side, 1156 second side, 1158 stator front pole shoe, 1160 stator center pole shoe, 1162 stator rear pole shoe, 120 rotor;

[0043] Figure 3 The corresponding relationship between the reference numerals and component names is as follows:

[0044] 100' motor, 110' stator, 112' stator yoke, 114' stator teeth, 120' rotor;

[0045] Figure 4 The corresponding relationship between the reference numerals and component names is as follows:

[0046] 1122' stator unit, 114' stator teeth, 1142' stator tooth body, 1144' stator pole shoe, 1146' first section, 1148' second section;

[0047] Figure 5 The corresponding relationship between the reference numerals and component names is as follows:

[0048] 1122' stator unit, 114' stator teeth, 1142' stator tooth body, 1144' pole shoe, 1146' first section, 1148' second section, 1170' third section. DETAILED DESCRIPTION

[0049] In order to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present invention and the features therein can be combined with each other without conflict.

[0050] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0051] Refer to the following Figure 1 and Figure 2 The stator 110 , the motor 100 , and the compressor provided according to some embodiments of the present invention are described.

[0052] Example 1:

[0053] like Figure 1 and Figure 2 As shown, according to a first aspect of the present invention, a stator 110 is provided, comprising a stator yoke 112 and a plurality of stator teeth 114. The stator yoke 112 is annular in structure, with the plurality of stator teeth 114 evenly distributed along the inner ring of the stator yoke 112. Stator slots are formed between adjacent stator teeth 114 to facilitate the installation of windings. When assembled into the motor 100, the rotor 120 is positioned in the middle of the stator 110, thereby forming a rotating magnetic field between the rotor 120 and the stator 110, thereby driving the rotor 120 to rotate.

[0054] In particular, a cross section of stator tooth 114 is taken perpendicular to the axis of stator yoke 112. In the cross section, the side of stator tooth 114 facing away from stator yoke 112, that is, the side facing rotor 120 after assembly into motor 100, has an outline including a first segment 1146 and a second segment 1148. First segment 1146 is connected to second segment 1148. Second segment 1148 has two ends: a first end 1150C connected to first segment 1146 and a second end 1152D facing away from first segment 1146. Second segment 1148 gradually moves away from the center of stator yoke 112 from first end 1150C to second end 1152D. In other words, after assembly into motor 100, second segment 1148 gradually moves away from rotor 120 from first end 1150C to second end 1152D.

[0055] In related technologies, such as Figure 3As shown, the air gap between stator 110' and rotor 120' is typically uniform, meaning the surface of stator tooth 114' facing rotor 120' is a circular arc. Simulation analysis shows that as concentrated winding motor 100' rotates with rotor 120', the buildup of winding current and the increase in air gap magnetic field significantly saturate at the leading stator pole shoe, i.e., the portion of rotor 120' that initially enters stator tooth 114' during rotation. Saturation is relatively mild at the trailing stator pole shoe, i.e., the portion of rotor 120' that exits stator tooth 114'. Armature reaction further exacerbates the distortion of the air gap magnetic field, resulting in high harmonic content and significant torque ripple in motor 100'.

[0056] The stator 110 provided by the present invention has a first section 1146 that gradually moves away from the rotor 120 from the first end 1150C to the second end 1152D. After the motor 100 is assembled, an air gap is formed between the stator 110 and the rotor 120. Figure 1 As shown in ω, that is, the rotor 120 rotates from the second section 1148 to the first section 1146. When the rotor 120 rotates, the air gap is increased at the stator front pole shoe 1158, that is, when it first enters the stator tooth 114, thereby reducing the magnetic circuit voltage drop on the air gap side, thereby greatly reducing the magnetic saturation at the second section 1148 of the stator tooth 114, that is, the stator front pole shoe 1158, thereby reducing the local saturation effect, weakening the distortion of the air gap magnetic field, reducing the harmonic content of the motor 100, improving the efficiency of the motor 100, and reducing the torque fluctuation.

[0057] Furthermore, since the first section 1146 gradually moves away from the center of the stator yoke 112 from the first end 1150C to the second end 1152D, the air gap gradually becomes smaller when the rotor 120 rotates, that is, the magnetic saturation gradually increases, thereby avoiding the increase in radial force caused by a cliff-like change in the air gap, thereby ensuring that the motor 100 has sufficient output power.

[0058] Example 2:

[0059] like Figure 2 As shown, based on Example 1, stator tooth 114 further includes: a stator tooth body 1142 and a stator pole shoe 1144. Stator pole shoe 1144 includes a stator front pole shoe 1158, a stator center pole shoe 1160, and a stator rear pole shoe 1162. Stator tooth body 1142 is disposed on the inner ring of stator yoke 112, and stator pole shoe 1144 is disposed at the end of stator tooth body 1142 facing away from stator yoke 112. First section 1146 and second section 1148 are disposed on the side of stator pole shoe 1144 facing away from stator tooth body 1142, wherein second section 1148 is at least partially located on stator front pole shoe 1158.

[0060] In this embodiment, the stator tooth 114 includes a stator tooth body 1142 and a stator pole shoe 1144. The stator tooth body 1142 is arranged between the stator yoke 112 and the stator pole shoe 1144. The stator pole shoe 1144 includes a stator front pole shoe 1158, a stator central pole shoe 1160 and a stator rear pole shoe 1162. The stator front pole shoe 1158 is the part of the rotor 120 that first enters the stator pole shoe 1144, and the stator rear pole shoe 1162 is the part of the rotor 120 that rotates out of the stator pole shoe 1144. The stator central pole shoe 1160 is located between the stator front pole shoe 1158 and the stator rear pole shoe 1162.

[0061] Example 3:

[0062] like Figure 2 As shown, based on Example 1 or Example 2, further, the first section 1146 is arc-shaped, the first section 1146 and the stator yoke 112 are concentric, and after being assembled into the motor 100, the first section 1146 and the rotor 120 are concentric.

[0063] In this embodiment, the first section 1146 is set as an arc segment and is concentric with the stator yoke 112. After being assembled into the motor 100, the air gap width distributed at the first section 1146 is uniform, and the width is represented by g, thereby compensating for the reduction in output power of the motor 100 caused by the increase in the air gap at the second section 1148.

[0064] Example 4:

[0065] like Figure 2 As shown, based on any one of Examples 1 to 3, the stator pole piece 1144 further includes a first side 1154 and a second side 1156 disposed on both sides of the first section 1146 and the second section 1148. Specifically, the first side 1154 is located on a side of the first section 1146 facing away from the second section 1148 and is connected to the first section 1146, and the second side 1156 is located on a side of the second section 1148 facing away from the first section 1146 and is connected to the second section 1148.

[0066] The stator tooth 114 is cross-sectioned in a direction perpendicular to the axis of the stator yoke 112. In the cross-section, the length of the first side 1154 is th, the length of the second side 1156 is th1, the intersection of the extension line of the first section 1146 and the extension line of the second side 1156 is point Q, and the length from the second end 1152D to point Q is th2, where th≥th1+th2. Specifically, th is the length of the first side 1154 along the radial direction of the stator yoke 112 , th1 is the length of the second side 1156 along the radial direction of the stator yoke 112 , and th2 is the length from D to Q along the radial direction of the stator yoke 112 .

[0067] In this embodiment, the distance from the second segment 1148D to the intersection Q of the extension line of the first segment 1146 and the extension line of the second side 1156 is defined as th2, the length of the second side 1156 is th1, and the length of the first side 1154 is th.

[0068] Make th, th1 and th2 satisfy: th≥th1+th2, Thus, the air gap at the end point D of the second section 1148 is reasonably limited, and the width and length of the slot are reasonably limited, thereby ensuring that the range of magnetic voltage drop reduction is reasonable, and preventing a significant impact on the power output of the motor 100. Furthermore, after the motor 100 is assembled, the air gap width distributed at the first section 1146 is g, thereby limiting <2g, th1=th2=1.4×g.

[0069] Then, the magnetic saturation at the first section 1146 is maintained at a certain level, thereby compensating for the reduction in output power of the motor 100 caused by the increase in the air gap at the first section 1146. According to simulation experiments, the present invention defines th≥th1+th2. The magnetic saturation of the first section 1146 and the magnetic saturation of the second section 1148 are preferably matched, thereby reducing the harmonic content and torque fluctuation of the motor 100 while ensuring the output power of the motor 100.

[0070] Example 5:

[0071] like Figure 2 As shown, based on any one of Examples 1 to 4, the stator teeth 114 are further cross-sectioned in a direction perpendicular to the axis of the stator yoke 112. In the cross-section, the stator pole shoe 1144 occupies a circumferential angle βs of the stator yoke 112, and the first segment 1146 occupies a circumferential angle βs of the stator yoke 112. The second section 1148 occupies an angle γ2 of the circumference of the stator yoke 112, where Specifically, the circumferential angle of the stator yoke 112 is 360°.

[0072] In this embodiment, the magnetic saturation phenomenon is not obvious in the part of the first section 1146 away from the second section 1148. Therefore, there is no need to increase the air gap there. In this case, starting from the first end 1150C of the second section 1148, the magnetic saturation phenomenon will gradually increase, and then the width of the air gap will gradually increase here, which can ensure the weakening effect of the magnetic saturation phenomenon.

[0073] That is, by limiting the overall distance of the second section 1148 where the air gap changes, the part where the air gap changes is limited to a range, thereby rationalizing the change in the air gap. This reduces the magnetic saturation while ensuring that the air gap at the first section 1146 where the magnetic saturation is not obvious has good air gap magnetic density, thereby reducing the torque fluctuation and ensuring the output power of the motor 100.

[0074] Specifically,

[0075] And, as Figure 2 As shown, point A is the endpoint of the first segment 1146 away from the second segment 1148, point B is the intersection of the first segment 1146 and the center line of the stator tooth 114, point C is the connection point between the first segment 1146 and the second segment 1148, and point D is the endpoint of the second segment 1148 away from the first segment 1146. Therefore, the angle occupied by the center of the circle of segments AB is

[0076] Example 6:

[0077] like Figure 2 As shown, on the basis of any one of Examples 1 to 5, further, the stator yoke 112 includes: a plurality of stator units 1122 connected in sequence, and the plurality of stator units 1122 are connected in sequence to form a ring structure to form the stator yoke 112, wherein any one of the plurality of stator units 1122 is connected to a stator tooth 114.

[0078] Specifically, an area enclosed by a line connecting two ends of a stator unit 1122 to the center of the stator yoke 112 has a stator tooth 114 and half of the stator slots on both sides of the stator tooth 114 .

[0079] In this embodiment, the stator yoke 112 has a plurality of stator units 1122 , and one stator unit 1122 is connected to one stator tooth 114 , thereby ensuring the structural uniformity of the entire stator 110 .

[0080] Example 7:

[0081] like Figure 2 As shown, based on any one of Examples 2 to 6, the stator teeth 114 are further cross-sectioned in a direction perpendicular to the axis of the stator yoke 112. In the cross-section, a stator unit 1122 occupies a circumferential angle of αs on the stator yoke 112, the number of poles of the stator 110 is ps, and the stator pole shoe 1144 occupies a circumferential angle of βs on the stator yoke 112. βs=kαs, where 0.5<k<1. Specifically, due to the existence of the stator slot openings, the center angle occupied by the stator pole shoe 1144 is smaller than the center angle occupied by one stator unit 1122 .

[0082] In this embodiment, by defining the circumferential angle βs occupied by the stator pole shoe 1144, the overall range of the air gap is defined, thereby indirectly defining the range of the second segment 1148 of the variable part of the air gap. While reducing magnetic saturation, a good air-gap magnetic density is ensured for the air gap at the position of the first segment 1146 where magnetic saturation is not obvious. While reducing torque fluctuations, the output power of the motor 100 is ensured. Moreover, the length of the slot opening is defined, and the length of the slot opening can be related to the losses of the motor 100. Furthermore, the losses of the motor 100 are limited to a relatively optimal range, improving the efficiency of the motor 100.

[0083] Embodiment 8:

[0084] As Figure 2 shown, based on any one of Embodiments 1 to 7, further, the second segment 1148 is a curved segment. Specifically, the second segment satisfies the quadratic function curve y = 0.0179×x 2 .

[0085] Embodiment 9:

[0086] Based on any one of Embodiments 1 to 8, further, the second segment 1148 is a straight segment.

[0087] Embodiment 10:

[0088] The present invention provides a two-segment arc-shaped stator 110, including a stator pole shoe 1144, a stator tooth body 1142, and a stator yoke 112. The stator 110 cooperates with a rotor 120 to form the structure of the motor 100. The stator pole shoe 1144 includes a stator rear pole shoe 1162, a stator front pole shoe 1158, and the center of the stator pole shoe 1144. The direction of the stator front pole shoe 1158 towards the stator rear pole shoe 1162 is the same as the rotation direction of the rotor 120. The surface of the stator pole shoe 1144 close to the rotor 120 is composed of two-segment arcs, the first segment 1146, i.e., the AC segment, and the second segment 1148, i.e., the CD segment. The air gap between the first segment 1146 and the rotor 120 is g. The second segment 1148, i.e., the CD segment, gradually moves away from the rotor 120 starting from point C to point D. The distance between D and the extended segment of the AC segment is th2, the distance from D to the bottom of the stator front pole shoe 1158 is th1, and the distance between A and the stator rear pole shoe 1162 is th. The three satisfy th≥th1 + th2, th1 / 3 < th2 < 2g. The circumferential angles occupied by the AC segment and the CD segment are βs / 2 + γ1 and γ2 respectively, and γ1 + γ2 = βs / 2, γ2 / γ1 > 1 / 4. The motor 100 applicable to the stator 110 provided in this embodiment is a single-direction running motor.

[0089] Furthermore, the stator 110 includes multiple units, and the circumferential angle corresponding to one unit is αs = 2π / ps, where ps is the number of stator poles of the stator 110. The angle corresponding to the stator pole shoe 1144 is βs = kαs, where 1 / 2 < k < 1.

[0090] Furthermore, the direction from the front stator pole shoe 1158 to the rear stator pole shoe 1162 is the same as the rotation direction of the rotor 120.

[0091] Furthermore, the surface of the stator pole shoe 1144 facing the rotor 120 is composed of two arc segments, namely the first segment 1146 (i.e., the AC segment) and the second segment 1148 (i.e., the CD segment).

[0092] The first segment 1146 (i.e., the AC segment) is an arc, maintaining the same air gap g with the rotor 120. The second segment 1148 (i.e., the CD segment) is a straight line or an arc, etc., gradually moving away from the rotor 120 from point C to D.

[0093] The thickness of the front stator pole shoe 1158 is th1, the distance between D and the extension of the first segment 1146 (i.e., the AC segment) is th1, and the thickness th of the rear stator pole shoe 1162 satisfies th ≥ th1 + th2, where th1 / 3 < th2 < 2g.

[0094] The circumferential angles occupied by the first segment 1146 (i.e., the AC segment) and the second segment 1148 (i.e., the CD segment) are βs / 2 + γ1 and γ2 respectively, and γ1 + γ2 = βs / 2, where γ2 / γ1 > 1 / 4.

[0095] The motor 100 applicable to the stator 110 provided in this embodiment is a unidirectional running motor.

[0096] In this embodiment, as Figure 3 shown, in the related art 1, the stator 110' includes multiple stator units, and the circumferential angle corresponding to one unit is αs = 2π / ps, where ps is the number of stator poles. In the related art 1, ps = 8 and αs = π / 4. The angle corresponding to the stator pole shoe is βs = kαs, where 1 / 2 < k < 1, and in the related art 1, k = 8 / 9. The stator pole shoe is symmetric about the center line, the structure of the stator pole shoe is symmetric left and right, and the distances between the inner circle of the stator pole shoe and the outer circle of the rotor are all equal. The stator pole shoe includes a rear stator pole shoe, a front stator pole shoe, and the center of the stator pole shoe. The direction from the front stator pole shoe to the rear stator pole shoe is the same as the rotation direction of the rotor. Through simulation analysis, since in the concentrated winding type motor, as the rotor rotates, the establishment of the winding current and the increase of the air gap magnetic field cause obvious saturation in the front stator pole shoe of the stator pole shoe, and the saturation phenomenon in the rear stator pole shoe of the stator pole shoe is relatively weak. The armature reaction further aggravates the distortion of the air gap magnetic field, resulting in a large harmonic content and obvious torque fluctuation in the motor 100'.

[0097] The present invention aims to eliminate the influence brought by the saturation effect of the front stator pole shoe 1158, as Figure 1 and Figure 2 As shown, the direction from the stator front pole shoe 1158 to the stator rear pole shoe 1162 is consistent with the rotation direction of the rotor 120. Figure 4 As shown, the direction from the stator front pole shoe 1158 to the stator rear pole shoe 1162 is opposite to the rotation direction of the rotor 120.

[0098] In the present invention, the surface of the stator pole piece 1144 proximal to the rotor 120 is formed into two arc-shaped segments: a first segment 1146, or AC segment, and a second segment 1148, or CD segment. The air gap between the first segment 1146, or AC segment, and the rotor 120 is g. The second segment 1148, or CD segment, gradually moves away from the rotor 120 from point C to point D. As point D moves away from the rotor 120, the air gap increases. This increase in air gap also increases the magnetic circuit voltage drop across the air gap, significantly reducing the magnetic saturation of the stator front pole piece 1158.

[0099] Furthermore, in order to ensure that the magnetic voltage drop is reduced reasonably and prevent a significant impact on the power output of the motor 100, the distance from the intersection Q of the extension line from the second section 1148D to the first section 1146 and the extension line of the second side 1156 is defined as th2, the length of the second side 1156 is th1, and the length of the first side 1154 is th.

[0100] Make th, th1 and th2 satisfy: th≥th1+th2, Thus, the air gap at the end point D of the second section 1148 is reasonably limited, and the width and length of the slot are reasonably limited, thereby ensuring that the magnetic voltage drop is reasonably reduced and preventing a significant impact on the power output of the motor 100. Furthermore, after the motor 100 is assembled, the air gap width distributed at the first section 1146 is g, thereby limiting

[0101] th1=th2=1.4×g.

[0102] Then, the magnetic saturation at the first section 1146 is maintained at a certain level, thereby compensating for the reduction in output power of the motor 100 caused by the increase in the air gap at the first section 1146. According to simulation experiments, the present invention defines th≥th1+th2. The magnetic saturation of the first section 1146 and the magnetic saturation of the second section 1148 are preferably matched, thereby reducing the harmonic content and torque fluctuation of the motor 100 while ensuring the output power of the motor 100.

[0103] Furthermore, the circumferential angles occupied by first segment 1146 (AC segment) and second segment 1148 (CD segment) are βs / 2 + γ1 and γ2, respectively. To ensure consistency in the total magnetic flux on both sides of stator pole shoe 1144, γ1 + γ2 = βs / 2 must be satisfied. Magnetic saturation is less pronounced near the center of stator pole shoe 1144, and closer to point B, so arc clipping is unnecessary. Saturation gradually intensifies at position C of stator pole shoe 1144, at which point arc clipping can be performed. For optimal arc clipping, γ2 / γ1 > 1 / 4 must be satisfied. Furthermore, γ2 / γ1 = 1.25, which optimizes the effect on magnetic saturation.

[0104] Furthermore, the first segment 1146, i.e., segment AC, is an arc, maintaining the same air gap g with the rotor 120. The second segment 1148, i.e., segment CD, is a straight line or an arc, etc., starting from point C and gradually moving away from the rotor 120 to point D. Specifically, a quadratic function curve y=0.0179×x about point C is used. 2 The farther away from point C, the larger the air gap after cutting.

[0105] Figure 4 Related technology 2, the motor includes a stator and a rotor, the stator includes a stator yoke and a plurality of stator teeth, the stator yoke includes a plurality of stator units 1122', the stator tooth 114' includes a stator pole shoe 1144' and a stator tooth body 1142', the stator pole shoe 1144' is provided with a first section 1146' and a second section 1148' on the side facing the rotor, the second section 1148' gradually moves away from the rotor from one end connected to the first section 1146' to the other end, and the rotation direction ω of the rotor is in the opposite direction from the first section 1146' to the second section 1148'.

[0106] It adopts an arc cutting method in the opposite direction of the rotor rotation direction, and the other parameters are completely consistent with the two-arc structure of the embodiment.

[0107] Figure 5 Related technology 3, the motor includes a stator and a rotor, the stator includes a stator yoke and a plurality of stator teeth 114', the stator yoke includes a plurality of stator units 1122', the stator teeth 114' include a stator pole shoe 1144' and a stator tooth body 1142', the stator pole shoe 1144' is provided with a first section 1146', a second section 1148' and a third section 1170' on the side facing the rotor, the second section 1148' and the third section 1170' are respectively located on both sides of the first section 1146', the second section 1148' gradually moves away from the rotor from one end connected to the first section 1146' to the other end, and the third section 1170' gradually moves away from the rotor from one end connected to the first section 1146' to the other end.

[0108] It adopts a stator tooth with a three-arc structure, which combines the related art 2 and the arc cutting method of the present invention to construct a symmetrical structure, which includes three arcs A'B', B'D', and D'E'.

[0109] like Figure 6 and Figure 7 As shown in the experimental data of the present invention and related technologies 1, 2 and 3, compared with related technology 1, the output torque of the present invention is greatly improved, and the output torque and efficiency are much greater than those of related technology 2 and 3.

[0110] The output power of this embodiment is far greater than that of Related Art 1, Related Art 2, and Related Art 3. This embodiment eliminates the saturation effect of the stator pole shoe 1144, significantly reducing the torque fluctuation coefficient compared to Related Art 1. However, Related Art 2 employs an arc-cutting method opposite to this embodiment, which increases the torque fluctuation coefficient and reduces the output power. Therefore, when this embodiment is applied to a unidirectional motor 100 and maintains the same relationship with the rotor's rotational direction, it can improve the stator pole shoe magnetic flux saturation, increase output torque and power, improve motor efficiency, and reduce torque fluctuation.

[0111] Example 11:

[0112] According to a second aspect of the present invention, the present invention provides a motor 100, comprising: a stator 110 as provided in any of the above embodiments; a rotor 120, arranged on the inner ring of the stator yoke 112, and the rotation direction of the rotor 120 is from the second section 1148 to the first section 1146.

[0113] The motor 100 provided by the present invention includes the stator 110 provided by any of the above embodiments, and therefore has all the beneficial effects of the motor 100 provided by any of the above embodiments, which will not be listed here one by one.

[0114] The following comparative experiments are conducted using the motor 100 provided in one embodiment of the present invention and the motors in Related Technology 1, Related Technology 2, and Related Technology 3.

[0115] Specifically, if Figure 3 As shown, in related technology 1, the motor 100' includes a stator 110' and a rotor, the stator 110' includes a stator yoke 112' and a plurality of stator teeth 114', the side of the stator teeth 114' facing the rotor is a circular arc concentric with the rotor, the air gap between the stator 110' and the rotor is g', the width of the stator pole shoe at the stator slot in the stator tooth 114' is th', the center angle occupied by the stator unit is αs', the center angle occupied by the stator pole shoe is βs', and, except that the side of the stator teeth 114' facing the rotor is different from that of the present invention, the other parameters are the same.

[0116] The stator 110’ includes multiple stator units. The circumferential angle corresponding to one unit is αs’ = 2π / ps’, where ps’ is the number of stator poles. In Related Art 1, ps’ = 8 and αs’ = π / 4. The angle corresponding to the stator pole shoe is βs’ = kαs’, where 1 / 2 < k’ < 1. In Related Art 1, k’ = 8 / 9. The stator pole shoe is symmetric about the center line, and its structure is symmetric left and right. The distances between the inner circle of the stator pole shoe and the outer circle of the rotor are all equal. The stator pole shoe includes a rear stator pole shoe, a front stator pole shoe, and the center of the stator pole shoe. The direction from the front stator pole shoe to the rear stator pole shoe is the same as the rotor rotation direction. Through simulation analysis, due to the concentrated winding type motor as the rotor rotates, the establishment of winding current and the increase of air-gap magnetic field are significantly saturated at the front stator pole shoe of the stator pole shoe, and the saturation phenomenon at the rear stator pole shoe of the stator pole shoe is relatively weak. The armature reaction further aggravates the distortion of the air-gap magnetic field, resulting in a large harmonic content and obvious torque fluctuation in the motor 100’.

[0117] Figure 4 For Related Art 2, the motor includes a stator and a rotor. The stator includes a stator yoke and multiple stator teeth. The stator yoke includes multiple stator units 1122’. The stator tooth 114’ includes a stator pole shoe 1144’ and a stator tooth body 1142’. A first section 1146’ and a second section 1148’ are provided on the side of the stator pole shoe 1144’ facing the rotor. The second section 1148’ gradually moves away from the rotor from the end connected to the first section 1146’ to the other end. The rotation direction ω of the rotor is from the first section 1146’ to the reverse of the second section 1148’.

[0118] It adopts an arc-cutting method opposite to the rotation direction of the rotor, and the other parameters are exactly the same as those of the two-segment arc structure in the embodiment.

[0119] Figure 5 For Related Art 3, the motor includes a stator and a rotor. The stator includes a stator yoke and multiple stator teeth 114’. The stator yoke includes multiple stator units 1122’. The stator tooth 114’ includes a stator pole shoe 1144’ and a stator tooth body 1142’. A first section 1146’, a second section 1148’ and a third section 1170’ are provided on the side of the stator pole shoe 1144’ facing the rotor. The second section 1148’ and the third section 1170’ are respectively located on both sides of the first section 1146’. The second section 1148’ gradually moves away from the rotor from the end connected to the first section 1146’ to the other end. The third section 1170’ gradually moves away from the rotor from the end connected to the first section 1146’ to the other end.

[0120] It adopts a stator tooth with a three-segment arc structure, which combines the arc-cutting methods of Related Art 2 and the present invention to construct a symmetric structure, which includes three arcs A’B’, B’D’, and D’E’.

[0121] Such as Figure 6As shown, the motor 100 provided by the present invention is in a better state in terms of output torque and efficiency than related technologies 1, 2 and 3.

[0122] like Figure 7 As shown, the motor 100 provided by the present invention is in a better state in terms of torque fluctuation coefficient and output power of the motor compared with related technologies 1, 2 and 3.

[0123] Example 12:

[0124] On the basis of Example 10, further, when the first section 1146 is an arc segment and the width between the second end 1152 of the second section 1148 of the stator 110 and the intersection Q of the extension line of the first section 1146 of the stator 110 and the extension line of the second side 1156 of the stator 110 is th2, th2 is less than 2 times the width g of the air gap formed between the rotor 120 and the first section 1146 of the stator 110.

[0125] That is, th2<2g.

[0126] In this embodiment, the magnetic saturation at the first section 1146 is maintained at a certain level, thereby compensating for the reduction in motor output power caused by the increase in the air gap at the first section 1146. According to simulation experiments, the present invention limits th2 to 2g, and then combines the structure of the stator 110 to form a better match between the magnetic saturation of the first section 1146 and the magnetic saturation of the second section 1148, thereby ensuring the output power of the motor 100 while reducing the harmonic content and torque fluctuation of the motor 100.

[0127] Example 13:

[0128] According to a third aspect of the present invention, the present invention provides a compressor, comprising: a stator 110 as provided in any one of the above embodiments; or a motor 100 as provided in any one of the above embodiments.

[0129] The compressor provided by the present invention includes the stator 110 provided in any of the above embodiments, and therefore has all the beneficial effects of the motor 100 provided in any of the above embodiments, which will not be described one by one here.

[0130] In the present invention, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The term "plurality" refers to two or more, unless expressly limited otherwise. Terms such as "installed," "connected," "connected," and "fixed" should be interpreted broadly. For example, "connected" can mean a fixed connection, a detachable connection, or an integral connection; "connected" can mean a direct connection or an indirect connection through an intermediary. Those skilled in the art will understand the specific meanings of these terms in the present invention based on specific circumstances.

[0131] In the description of the present invention, it should be understood that the directions or positional relationships indicated by terms such as "up", "down", "left", "right", "front" and "back" are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limiting the present invention.

[0132] Throughout this specification, terms such as "one embodiment," "some embodiments," and "specific embodiments" mean that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0133] The foregoing 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 various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A motor, characterized in that: The invention comprises a stator and a rotor, wherein the stator comprises a stator yoke and a plurality of stator teeth; The stator yoke is an annular structure; A plurality of stator teeth are arranged on the inner ring of the stator yoke, The stator tooth is cross-sectioned in a direction perpendicular to the axis of the stator yoke. In the cross-section, the contour line of the stator tooth on the side facing away from the stator yoke includes a first segment and a second segment connected to each other. The second segment includes a first end and a second end. The first end is connected to the first segment, and the second end faces away from the first segment. The second segment gradually moves away from the center of the stator yoke from the first end to the second end. The stator teeth include a stator tooth body and a stator pole shoe; the stator tooth body is provided on the inner ring of the stator yoke; the stator pole shoe is provided on one end of the stator tooth body away from the stator yoke; The stator pole shoe further includes a first side and a second side; The first side is connected to the first section and is located on a side of the first section facing away from the second section; The second side is connected to the second section and is located on a side of the second section facing away from the first section. The stator tooth is cross-sectioned in a direction perpendicular to the axis of the stator yoke. In the cross-section, the length of the first side is th, the length of the second side is th1, the intersection of the extended line of the first segment and the extended line of the second side is point D, and the length from the second end to point D is th2. th is the length of the first side along the radial direction of the stator yoke, and th1 is the length of the second side along the radial direction of the stator yoke; The rotor is arranged on the inner ring of the stator yoke, and the rotation direction of the rotor is the direction from the second section to the first section; When the first segment is an arc segment, the width between the second end of the second segment of the stator and the intersection of the extension line of the first segment of the stator and the extension line of the second side of the stator is th2, and th2 is less than 2 times the width of the air gap formed between the rotor and the first segment of the stator; The motor is a unidirectional running motor.

2. The motor according to claim 1, characterized in that The first section and the second section are arranged on a side of the stator pole shoe facing away from the stator tooth body.

3. The motor according to claim 2, characterized in that The first section is in an arc shape, and the first section is concentric with the stator yoke.

4. The motor according to claim 2 or 3, characterized in that The stator teeth are sectioned in a direction perpendicular to the axis of the stator yoke. In the section, the stator pole shoe occupies a circumferential angle of βs on the stator yoke, and the first segment occupies a circumferential angle of The second section occupies an angle γ2 on the circumference of the stator yoke. in, 5. The motor according to claim 2 or 3, characterized in that The stator yoke comprises: A plurality of stator units are sequentially connected in an annular structure to form the stator yoke. Wherein, any one of the plurality of stator units is connected to a stator tooth.

6. The motor according to claim 5, characterized in that The stator teeth are cross-sectioned in a direction perpendicular to the axis of the stator yoke. In the cross-section, a stator unit occupies a circumferential angle of αs on the stator yoke, the number of poles of the stator is ps, and the stator pole shoe occupies a circumferential angle of βs on the stator yoke. Among them, 0.5<k<1.

7. The electric motor according to any one of claims 1 to 3, characterized in that The second segment is a curved segment or a straight segment.

8. A compressor, characterized in that: include: A motor as claimed in any one of claims 1 to 7.

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