Motor and electric appliance

Abstract

The invention discloses a motor and an electric appliance, the motor comprises a stator assembly and a rotor assembly, the stator assembly comprises a stator iron core, and the stator iron core is provided with a stator inner hole; the rotor assembly is arranged in the stator inner hole and comprises a rotor iron core and a plurality of rotor magnetic poles, and the rotor magnetic poles are arranged on the rotor iron core in the circumferential direction of the rotor iron core and divide the rotor iron core into a plurality of iron core units; the outer contour line of at least one iron core unit comprises one or more sections of arcs, and the stator iron core is provided with a circular virtual inner contour line; a first gap is formed between the outer contour line of the iron core unit and the virtual inner contour line of the stator iron core, the first gap located on the first side of the iron core unit is larger than the first gap located on the second side of the iron core unit, the first side is one side of the rotation direction of the rotor assembly, and the second side is one side of the reverse rotation direction of the rotor assembly. The motor iron loss can be reduced, the motor efficiency is improved, and the torque pulsation and the radial electromagnetic force are improved.

Description

Technical Field

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

[0002] In order to improve the torque fluctuation and radial electromagnetic force of the built-in permanent magnet synchronous motor, the rotor core and stator tooth shoe are usually cut. The traditional arc cutting method is symmetrical about the center line of the rotor core or the center line of the stator tooth. However, in the field where motors such as fans and compressors only have unidirectional rotation conditions, since the phase relationship between the armature magnetic field and the permanent magnetic field is fixed, there will always be a local saturation point in the stator tooth shoe in the opposite direction of rotation. The appearance of the local saturation point will cause the motor iron loss, torque fluctuation and radial electromagnetic force to increase significantly, which will lead to a decrease in motor efficiency. Summary of the invention

[0003] The main purpose of the present invention is to provide a motor, aiming to reduce the iron loss of the motor and improve the output efficiency of the motor.

[0004] To achieve the above object, the present invention provides a motor, which comprises:

[0005] A stator assembly includes a stator core having a stator inner bore; and

[0006] A rotor assembly, the rotor assembly is arranged in the inner hole of the stator, the rotor assembly comprises a rotor core and a plurality of rotor poles, the plurality of rotor poles are arranged in the rotor core along the circumference of the rotor core, and the rotor core is separated into a plurality of core units; the outer contour line of at least one of the core units comprises one or more circular arcs, and the stator core has a circular virtual inner contour line;

[0007] A first gap is formed between the outer contour line of the core unit and the virtual inner contour line of the stator core. The first gap on the first side of the core unit is larger than the first gap on the second side of the core unit. The first side is a side in the rotation direction of the rotor assembly, and the second side is a side in the reverse rotation direction of the rotor assembly.

[0008] In one embodiment, the outer contour line of at least one of the core units is divided into a first arc segment and a second arc segment by a line thereof, the first arc segment and the second arc segment are arranged sequentially along the direction of rotation of the rotor assembly, and the maximum width of the first gap at the second arc segment is greater than the maximum width of the first gap at the first arc segment.

[0009] In one embodiment, the first arc segment is composed of a plurality of sub-arcs with the same or different curvatures, and the centers of the sub-arcs are located on the same side of the second arc segment as the center of the rotor core; or,

[0010] The second arc segment is composed of a plurality of sub-arcs with the same or different curvatures, and the centers of the sub-arcs are located on the same side of the second arc segment as the center of the rotor core.

[0011] In one embodiment, a width of the first gap in the second arc segment gradually increases from the center line toward a direction away from the center line.

[0012] In one embodiment, the first arc segment includes a first sub-arc segment and a second sub-arc segment, and the second sub-arc segment is arranged close to the center line;

[0013] The maximum width of the first gap in the first sub-arc segment is smaller than the maximum width of the first gap in the second sub-arc segment.

[0014] In one embodiment, the second arc segment includes a third sub-arc segment and a fourth sub-arc segment, and the third sub-arc segment is arranged close to the center line;

[0015] The maximum width of the first gap in the fourth sub-arc segment is greater than the maximum width of the first gap in the third sub-arc segment;

[0016] The maximum width of the first gap in the fourth sub-arc segment is greater than the maximum width of the first gap in the first sub-arc segment.

[0017] In one embodiment, the second sub-arc segment is smoothly connected to the third sub-arc segment, and the first gap has the same width as the second sub-arc segment and the third sub-arc segment.

[0018] In one embodiment, the width of the first gap in the fourth sub-arc segment gradually increases from the connection between the fourth sub-arc segment and the third sub-arc segment toward a direction away from the center line;

[0019] And / or, the width of the first gap in the first sub-arc segment gradually increases from the connection point of the first sub-arc segment and the second sub-arc segment toward the direction away from the center line.

[0020] In one embodiment, the rotor core has a circular virtual outer contour line, and a second gap is formed between the virtual outer contour line of the rotor core and the tooth contour line of the stator core, and the second gap located on the second side of the core unit is larger than the second gap located on the first side of the core unit.

[0021] In one embodiment, the first gap and the second gap together constitute an air gap between the rotor core and the stator core.

[0022] In one embodiment, a ratio of a maximum width of the second gap at the first arc segment to a minimum width of the second gap is less than 2.5 and greater than 1;

[0023] and / or a ratio of a maximum width of the second gap at the second arc segment to a minimum width of the second gap is less than 2.5 and greater than 1;

[0024] And / or, a ratio of a maximum width of the second gap at the first arc segment to a minimum width of the second gap is smaller than a ratio of a maximum width of the second gap at the second arc segment to a minimum width of the second gap.

[0025] In one embodiment, the stator core has stator slots, the number of the stator slots is Q1, and the number of the rotor poles is Q2;

[0026] Q1 and Q2 satisfy: Q2 = Q1 ± 2, or Q2 = Q1 ± 4.

[0027] The present invention further provides an electrical appliance, comprising the motor described in any one of the aforementioned embodiments.

[0028] The technical solution of the present invention adopts a motor including a stator assembly and a rotor assembly, wherein the stator assembly includes a stator core, and the stator core has a stator inner hole; the rotor assembly is arranged in the stator inner hole, and the rotor assembly includes a rotor core and a plurality of rotor poles, and the plurality of rotor poles are arranged in the rotor core along the circumference of the rotor core, and the rotor core is separated into a plurality of core units; the outer contour line of at least one core unit includes one or more arc segments, and the stator core has a circular virtual inner contour line; there is a first gap between the outer contour line of the core unit and the virtual inner contour line of the stator core, and the first gap located on the first side of the core unit is larger than the first gap located on the second side of the core unit, the first side is one side of the rotation direction of the rotor assembly, and the second side is one side of the reverse rotation direction of the rotor assembly. Such a setting can avoid the stator shoe portion from easily appearing a local saturation point at a position in the reverse direction of the rotation direction, thereby effectively improving the tooth shoe saturation, reducing the motor iron loss, improving the motor efficiency, and improving the torque pulsation and radial electromagnetic force. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0030] Figure 1 It is a structural schematic diagram of an embodiment of a motor of the present invention;

[0031] Figure 2 It is a structural schematic diagram of another embodiment of the motor of the present invention;

[0032] Figure 3 It is a structural schematic diagram of another embodiment of the motor of the present invention;

[0033] Figure 4 It is a structural schematic diagram of an embodiment of a motor of the present invention;

[0034] Figure 5 A schematic diagram of the structure of another embodiment of the motor of the present invention

[0035] Figure 6 for Figure 5 A schematic structural diagram of an embodiment of a stator assembly;

[0036] Figure 7 is the iron loss and Figure 2 A relationship diagram of an embodiment of an eccentric arc central angle of the second arc segment;

[0037] Figure 8 The motor efficiency and Figure 2 A relationship diagram of an embodiment of an eccentric arc central angle of the second arc segment;

[0038] Fig. 9 is the torque fluctuation and Figure 2 A relationship diagram of an embodiment of an eccentric arc central angle of the second arc segment;

[0039] Fig.10 is the radial force and Figure 2 A relationship diagram of an embodiment of an eccentric arc central angle of the second arc segment;

[0040] Fig.11 This is the magnetic flux density cloud diagram of the motor under the existing rotor arc cutting technology;

[0041] Fig.12 It is the magnetic density cloud diagram of the motor of the present invention.

[0042] Description of Figure Numbers:

[0043] Label name Label name 1 Motor 100 Rotor core 10 Rotor assembly 110 Core unit 20 Stator components 111 The first arc segment 21 Stator core 111a The first sub-arc segment 21a stator yoke 111b The second sub-arc segment 21b Stator teeth 112 The second arc segment 21c Stator shoe 112a The third sub-arc segment 22 Stator slot 112b Fourth sub-arc segment 30 Air Gap 200 Rotor pole

[0044] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0045] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0046] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0047] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if the meaning of "and / or" appearing in the full text is to include three parallel schemes, taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0048] The present invention provides a motor.

[0049] In the embodiment of the present invention, Figures 1 to 12As shown, the motor 1 includes a stator assembly 20 and a rotor assembly 10, the stator assembly 20 includes a stator core 21, and the stator core 21 has a stator inner hole; the rotor assembly 10 is arranged in the stator inner hole, the rotor assembly 10 includes a rotor core 100 and a plurality of rotor poles 200, the plurality of rotor poles 200 are arranged in the rotor core 100 along the circumference of the rotor core 100, and the rotor core 100 is separated into a plurality of core units 110; the outer contour line of at least one of the core units 110 includes one or more arcs, and the stator core 100 has a circular virtual inner contour line; a first gap is formed between the outer contour line of the core unit 110 and the virtual inner contour line of the stator core 100, and the first gap located on the first side of the core unit 110 is larger than the first gap located on the second side of the core unit 110, the first side is a side of the rotation direction of the rotor assembly 10, and the second side is a side of the reverse rotation direction of the rotor assembly 10.

[0050] Among them, the stator core 100 has a circular virtual inner contour line tangent to all stator boots 21c, and the rotor assembly 10 is an important component of the stator assembly 20 in the motor 1. The rotor assembly 10 usually needs to be used in conjunction with the stator assembly 20. The rotor assembly 10 can be sold together with the stator assembly 20 to form the motor 1, or it can be produced and sold separately. Usually, the stator assembly 20 includes a stator core 21, and the stator core 21 has a stator inner hole; the rotor assembly 10 is arranged in the stator inner hole, and an air gap 30 is formed between the rotor core 100 and the stator core 21.

[0051] In this example, see Figure 4 and Figure 5 The rotor assembly 10 generally includes a rotor core 100 and a rotor pole 200. A plurality of rotor poles 200 are arranged on the rotor core 100 along the circumference of the rotor core 100, and the rotor core 100 is divided into a plurality of core units 110. The ends of the plurality of core units 110 close to the center of the rotor core 100 may be connected or disconnected. In addition, the ends of the plurality of core units 110 away from the center of the rotor core 100 are disconnected, so as to avoid magnetic leakage of the rotor core 100.

[0052] Furthermore, each of the core units 110 has a center line passing through the center of the rotor core 100; the outer contour line of at least one of the core units 110 is divided into a first arc segment 111 and a second arc segment 112 by the center line, and the maximum width of the first gap at the second arc segment 112 is greater than the maximum width of the first gap at the first arc segment 111. For example, please refer to Figure 1 and Figure 2, point O is the center of the rotor core 100, and the center line passing through point O is the center line of the core unit 110. H1 is the distance between the first arc segment 111 and the center of the rotor core 100, and H2 is the distance between the first arc segment 111 and the center of the rotor core 100. It can be understood that the minimum value of H2 is less than the minimum value of H1. In this way, when the rotor assembly 10 is applied to the motor 1, the air gap 30 at the second arc segment 112 is increased, thereby effectively improving the tooth boot saturation, reducing the iron loss of the motor 1, improving the efficiency of the motor 1, and improving the torque pulsation and radial electromagnetic force.

[0053] It should be understood that the rotor assembly 10 of the present invention is applied to a unidirectional rotating motor 1, that is, a motor 1 that rotates in only one direction, wherein a local saturation point always appears at a position opposite to the rotation direction of the stator shoe 21c, and the first arc segment 111 and the second arc segment 112 are arranged in sequence along the rotation direction of the rotor assembly 10. For example, refer to Figures 1 to 3 , when the rotation direction of the rotor assembly 10 is counterclockwise, a local saturation point is likely to appear at the right side of the stator shoe 21c, the second arc segment 112 is located to the left of the center line of the core unit 110 passing through the center of the rotor core 100, and the first arc segment 111 is located to the right of the center line of the core unit 110 passing through the center of the rotor core 100. If, when the rotation direction of the rotor assembly 10 is clockwise, a local saturation point is likely to appear at the left side of the stator shoe 21c, the second arc segment 112 is located to the right of the center line of the core unit 110 passing through the center of the rotor core 100, and the first arc segment 111 is located to the left of the center line of the core unit 110 passing through the center of the rotor core 100.

[0054] The motor 1 provided by the present invention includes a stator assembly 20 and a rotor assembly 10, wherein the stator assembly 20 includes a stator core 21, and the stator core 21 has a stator inner hole; the rotor assembly 10 is arranged in the stator inner hole, and the rotor assembly 10 includes a rotor core 100 and a plurality of rotor poles 200, wherein the plurality of rotor poles 200 are arranged in the rotor core 100 along the circumference of the rotor core 100, and separate the rotor core 100 into a plurality of core units 110; the outer contour line of at least one of the core units 110 includes one or more arcs, and the stator core 100 has a circular virtual inner contour line; a first gap is formed between the outer contour line of the core unit 110 and the virtual inner contour line of the stator core 100, and the first gap located on the first side of the core unit 110 is larger than the first gap located on the second side of the core unit 110, the first side is a side of the rotation direction of the rotor assembly 10, and the second side is a side of the reverse rotation direction of the rotor assembly 10. In this way, the technical solution of the present invention increases the air gap 30 at the second arc segment 112 to avoid the local saturation point that is easy to appear in the stator shoe portion 21c in the opposite direction of the rotation direction, thereby effectively improving the tooth shoe saturation, reducing the iron loss of the motor 1, improving the efficiency of the motor 1, and improving the torque pulsation and radial electromagnetic force.

[0055] See also Figure 1 and Figure 2 In a preferred embodiment, the distance from the second arc segment 112 to the center of the rotor core 100 gradually decreases from the center line toward the direction away from the center line. In this way, the technical solution of this embodiment is easy to process during production, and can further avoid the local saturation point of the stator shoe portion 21c in the opposite direction of the rotation direction, thereby further improving the tooth shoe saturation, reducing the iron loss of the motor 1, improving the efficiency of the motor 1, and improving the torque pulsation and radial electromagnetic force.

[0056] For further information, see Figure 2 , Figures 7 to 10 , Figure 7 is the iron loss and Figure 2 A relationship diagram of an embodiment of the eccentric arc central angle of the second arc segment 112; Figure 8 The efficiency of motor 1 is Figure 2 A relationship diagram of an embodiment of the eccentric arc central angle of the second arc segment 112; Fig. 9 is the torque fluctuation and Figure 2 A relationship diagram of an embodiment of the eccentric arc central angle of the second arc segment 112; Fig.10 is the radial force and Figure 2d1 is the first gap between the outer contour of the core unit and the virtual inner contour of the stator core, point O is the center of the rotor core 100, point O' is the center of the second arc segment 112, and the center line passing through point O is the angle between the center line of the core unit 110 and the line OO', which is the eccentric arc center angle, that is, Figure 2 The ɑ angle, a negative value of the ɑ angle means that O' is on the right side of the center line, and a positive value means that O' is on the left side of the center line. Figures 7 to 10 In the figure, the relationship diagram of iron loss, motor 1 efficiency, torque fluctuation and radial force with the center angle of the eccentric arc is a data relationship diagram obtained by finite element simulation. It can be seen from the figure that when ɑ takes a value of -2° to -10°, the rotor assembly 10 has the best effect on improving tooth boot saturation, reducing motor 1 iron loss, improving motor 1 efficiency, and improving torque pulsation and radial electromagnetic force. In addition, the meaning of -2° to -10° refers to that the expansion direction of the angle is the center line toward the OO' line, and the angle between the center line and the OO' line is between 2° and 10°. Specifically, ɑ values ​​include but are not limited to 2°, 3°, 4°, 5°, 6°, 7°, 8°, 9° or 10°.

[0057] In an exemplary embodiment, the first arc segment 112 is composed of a plurality of sub-arcs with the same or different curvatures, and the center of the sub-arcs is located on the same side of the second arc segment 112 as the center of the rotor core 100; or, the second arc segment 112 is composed of a plurality of sub-arcs with the same or different curvatures, and the center of the sub-arcs is located on the same side of the second arc segment 112 as the center of the rotor core 100. It should be understood that the second arc segment 112 can be an arc with the same curvature, or it can be a combination of multiple arcs with different curvatures. In an embodiment of multiple arcs with different curvatures, the multiple arcs are connected with a smooth transition, and the center of the arc is located on the same side of the second arc segment 112 as the center of the rotor core 100. Similarly, the first arc segment 111 can be an arc with the same curvature, or it can be a combination of multiple arcs with different curvatures. In an embodiment of multiple arcs with different curvatures, the multiple arcs are connected with a smooth transition, and the center of the arc is located on the same side of the first arc segment 111 as the center of the rotor core 100.

[0058] See also Figure 3 In an exemplary embodiment, the width of the first gap in the second arc segment 111b gradually increases from the center line toward a direction away from the center line.

[0059] See also Figure 3In an exemplary embodiment, the first arc segment 111 includes a first sub-arc segment 111a and a second sub-arc segment 111b, and the second sub-arc segment 111b is arranged close to the center line; the maximum width of the first gap in the first sub-arc segment 111a is smaller than the maximum width of the first gap in the second sub-arc segment 111b.

[0060] On the basis of the previous embodiment, in order to further reduce the iron loss of the motor 1, or to improve the output efficiency of the motor 1, the second arc segment 112 includes a third sub-arc segment 112a and a fourth sub-arc segment 112b, the third sub-arc segment 112a is arranged close to the center line; the maximum width of the first gap in the fourth sub-arc segment 112b is greater than the maximum width of the first gap in the third sub-arc segment 112a; the maximum width of the first gap in the fourth sub-arc segment 112b is greater than the maximum width of the first gap in the first sub-arc segment 111a. Preferably, the second sub-arc segment 111b is smoothly connected to the third sub-arc segment 112a, and the distances from the second sub-arc segment 111b to the center of the rotor core 100 are equal.

[0061] In one embodiment, the distance of the first gap from the fourth sub-arc segment 112b to the center of the rotor core 100 gradually increases from the connection between the fourth sub-arc segment 112b and the third sub-arc segment 112a toward the direction away from the center line. And / or the width of the first gap in the first sub-arc segment gradually increases from the connection between the first sub-arc segment 111a and the second sub-arc segment 111b toward the direction away from the center line.

[0062] See also Figure 5 and Figure 6 In one embodiment, the rotor core 100 has a circular virtual outer contour line, and a second gap is formed between the virtual outer contour line of the rotor core 100 and the tooth contour line of the stator core 21, and the second gap located on the second side of the core unit 110 is larger than the second gap located on the first side of the core unit 110. The circular virtual outer contour line of the rotor core 100 is tangent to all the core units 110, and d2 is the second gap between the virtual outer contour line of the rotor core and the tooth contour line of the stator core 100. Further, the first gap and the second gap together constitute the air gap between the rotor core 100 and the stator core 21.

[0063] Considering that the air gap 30 between the rotor core 100 and the stator core 21 needs to be within a reasonable range, it will have a better beneficial effect, so that the torque fluctuation of the motor 1 can be small, the noise is small, and the efficiency is high. It has been proved by experiments that the ratio of the maximum width of the second gap at the first arc segment 111 to the minimum width of the second gap is less than 2.5 and greater than 1; the ratio of the maximum width of the second gap at the second arc segment 112 to the minimum width of the second gap is less than 2.5 and greater than 1, and the ratio of the maximum width of the second gap at the first arc segment 111 to the minimum width of the second gap is less than the ratio of the maximum width of the second gap at the second arc segment 112 to the minimum width of the second gap. In this range, the torque fluctuation, noise, and output efficiency of the motor 1 are well improved.

[0064] It can be understood that the ratio of the maximum width of the second gap at the second arc segment 112 to the minimum width of the second gap is greater than the ratio of the maximum width of the second gap at the first arc segment 111 to the minimum width of the second gap. The ratio of the maximum width of the second gap at the first arc segment 111 to the minimum width of the second gap / the ratio of the maximum width of the second gap at the second arc segment 112 to the minimum width of the air gap 30 can be 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 2.0, 2.1, 2.2, 2.3, 2.4.

[0065] Exemplarily, the minimum width of the second gap is 0.40 mm, then the width of the second gap at the second arc segment 112 ranges from greater than 0.40 mm to less than 1.0 mm, and the width of the second gap at the first arc segment 111 ranges from greater than 0.40 mm to less than 1.0 mm. Specifically, the maximum width of the second gap at the second arc segment 112 includes but is not limited to 0.45mm, 0.50mm, 0.55mm, 0.60mm, 0.65mm, 0.70mm, 0.75mm, 0.80mm, 0.85mm, 0.90mm, 0.95mm or 0.99mm; the maximum width of the second gap at the first arc segment 111 includes but is not limited to 0.42mm, 0.45mm, 0.50mm, 0.55mm, 0.60mm, 0.65mm, 0.70mm, 0.75mm, 0.80mm, 0.85mm, 0.90mm or 0.95mm. And the width of the second gap at the first arc segment 111 / the minimum width of the second gap needs to be smaller than the width of the second gap at the second arc segment 112 / the minimum width of the second gap, that is, the maximum width of the second gap at the first arc segment 111 is smaller than the maximum width of the second gap at the second arc segment.

[0066] See also Figure 5 and Figure 6 The stator assembly 20 generally includes a stator winding, and the stator core 21 includes a stator yoke 21a, a stator tooth 21b and a stator shoe 21c. A stator slot 22 is formed between two adjacent stator teeth 21b. The stator winding is generally wound around the stator tooth 21b, and specifically may be wound around only one stator tooth 21b, or may span multiple stator slots 22 and be wound around multiple stator teeth 21b.

[0067] Based on this, in a preferred embodiment, the stator core 21 has stator slots 22. In order to reduce the number of the stator slots 22 to Q1, the number of the rotor poles 200 is Q2; Q1 and Q2 satisfy: Q2 = Q1 ± 2, or Q2 = Q1 ± 4. In this way, when the number of the stator slots 22 and the number of the rotor poles 200 are particularly close, the stator winding can be wound on only one stator tooth 21b, or on two adjacent stator teeth 21b, thereby shortening the size of the motor 1 and improving the output efficiency of the motor 1.

[0068] For example, the number Q1 of the stator slots 22 may be 12, and the number Q2 of the rotor poles 200 may be 8, 10, 14 or 16. Preferably, the number Q1 of the stator slots 22 is 12, and the number Q2 of the rotor poles 200 is 10.

[0069] See also Fig.11 and Fig.12 , Fig.11 This is the magnetic density cloud diagram of the motor under the existing rotor arc cutting technology. Fig.12 The magnetic density cloud diagram of the motor of the present invention is shown in FIG. After adopting the technology of the present invention, the magnetic density at the local saturation position of the stator tooth shoe 21c is reduced from 1.78T to 1.64T, which proves that the saturation of the stator tooth shoe 21c is effectively improved.

[0070] The present invention further provides an electrical appliance, which includes the motor 1 described in any of the above embodiments. The specific structure of the motor 1 refers to the above embodiments. Since the electrical appliance of the present invention adopts all the technical solutions of all the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here. Among them, the electrical appliance can be a fan or a compressor, etc., or an electrical appliance having the rotor assembly 10, the motor 1, the fan or the compressor, which is not specifically limited here.

[0071] The above descriptions are only optional embodiments of the present invention, and are not intended to limit the patent scope of the present invention. All equivalent structural changes made using the contents of the present invention's specification and drawings, or directly / indirectly applied in other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. A motor, characterized in that: include: A stator assembly includes a stator core having a stator inner hole; as well as A rotor assembly, the rotor assembly is arranged in the inner hole of the stator, the rotor assembly comprises a rotor core and a plurality of rotor poles, the plurality of rotor poles are arranged in the rotor core along the circumference of the rotor core, and the rotor core is separated into a plurality of core units; the outer contour line of at least one of the core units comprises one or more circular arcs, and the stator core has a circular virtual inner contour line; A first gap is formed between the outer contour line of the core unit and the virtual inner contour line of the stator core. The first gap on the first side of the core unit is larger than the first gap on the second side of the core unit. The first side is a side in the rotation direction of the rotor assembly, and the second side is a side in the reverse rotation direction of the rotor assembly.

2. The motor according to claim 1, characterized in that The outer contour line of at least one of the core units is divided into a first arc segment and a second arc segment by the midline thereof, the first arc segment and the second arc segment are arranged sequentially along the direction of rotation of the rotor assembly, and the maximum width of the first gap at the second arc segment is greater than the maximum width of the first gap at the first arc segment.

3. The motor according to claim 2, characterized in that The first arc segment is composed of a plurality of sub-arcs with the same or different curvatures, and the centers of the sub-arcs are located on the same side of the second arc segment as the center of the rotor core; or, The second arc segment is composed of a plurality of sub-arcs with the same or different curvatures, and the centers of the sub-arcs are located on the same side of the second arc segment as the center of the rotor core.

4. The motor according to claim 2, characterized in that The width of the first gap in the second arc segment gradually increases from the center line toward a direction away from the center line.

5. The motor according to claim 2, characterized in that The first arc segment includes a first sub-arc segment and a second sub-arc segment, and the second sub-arc segment is arranged close to the center line; The maximum width of the first gap in the first sub-arc segment is smaller than the maximum width of the first gap in the second sub-arc segment.

6. The motor according to claim 5, characterized in that The second arc segment includes a third sub-arc segment and a fourth sub-arc segment, and the third sub-arc segment is arranged close to the center line; The maximum width of the first gap in the fourth sub-arc segment is greater than the maximum width of the first gap in the third sub-arc segment; The maximum width of the first gap in the fourth sub-arc segment is greater than the maximum width of the first gap in the first sub-arc segment.

7. The motor according to claim 6, characterized in that The second sub-arc segment is smoothly connected to the third sub-arc segment, and the first gap has the same width as the second sub-arc segment and the third sub-arc segment.

8. The motor according to claim 6, characterized in that The width of the first gap in the fourth sub-arc segment gradually increases from the connection point between the fourth sub-arc segment and the third sub-arc segment toward a direction away from the center line; And / or, the width of the first gap in the first sub-arc segment gradually increases from the connection point of the first sub-arc segment and the second sub-arc segment toward the direction away from the center line.

9. The motor according to claim 2, characterized in that The rotor core has a circular virtual outer contour line, and a second gap is formed between the virtual outer contour line of the rotor core and the tooth contour line of the stator core. The second gap located on the second side of the core unit is larger than the second gap located on the first side of the core unit.

10. The motor according to claim 9, characterized in that The first gap and the second gap together constitute an air gap between the rotor core and the stator core.

11. The motor according to claim 9, characterized in that The ratio of the maximum width of the second gap at the first arc segment to the minimum width of the second gap is less than 2.5 and greater than 1; and / or a ratio of a maximum width of the second gap at the second arc segment to a minimum width of the second gap is less than 2.5 and greater than 1; And / or, a ratio of a maximum width of the second gap at the first arc segment to a minimum width of the second gap is smaller than a ratio of a maximum width of the second gap at the second arc segment to a minimum width of the second gap.

12. The motor according to claim 2, characterized in that The stator core has stator slots, the number of the stator slots is Q1, and the number of the rotor poles is Q2; Q1 and Q2 satisfy: Q2 = Q1 ± 2, or Q2 = Q1 ± 4.

13. An electrical appliance, characterized in that: include: An electric machine as claimed in any one of claims 1 to 12.

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