CN214506685U - Stator core unit, stator core, motor and compressor - Google Patents

Abstract

The utility model discloses a stator core unit, a stator core, a motor and a compressor, wherein, the stator core unit comprises a stator yoke unit; the stator yoke unit is provided with a plurality of stator teeth, each stator tooth is arranged on the corresponding stator yoke unit and extends towards the center of the motor, and each stator tooth is provided with an arc surface facing the center of the motor and extending along the circumferential direction of the corresponding stator yoke unit; the center of the arc surface of each stator tooth part has an eccentric distance relative to the center of the motor; in one stator core unit, the eccentricity of the circle centers of the arc surfaces of the plurality of stator tooth parts relative to the center of the motor is different from each other. The utility model discloses technical scheme can effectively reduce the vibration and the noise of motor.

Description

Stator core unit, stator core, motor and compressor

Technical Field

The utility model relates to the technical field of electric machines, in particular to stator core unit, stator core, motor and compressor.

Background

At present, based on the operation characteristics of the bidirectional rotation of a rotor in a motor and in order to facilitate mass production, in the structural design of the existing motor, stator tooth parts which are symmetrical left and right are often arranged in a stator core, and the stator tooth parts are symmetrically arranged, so that a larger harmonic magnetic field is prevented from being introduced, and the vibration and the noise of the motor are reduced. However, when the symmetrical stator structure is applied to the unidirectional rotating motor, the vibration and noise of the motor are still large, and the performance is more obvious especially in the unidirectional rotating motors such as automobile driving motors, fan motors, range hood motors, water pump motors and the like.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a stator core unit, stator core, motor and compressor aims at effectively solving the vibration and the noise problem of unidirectional rotating electrical machines.

In order to achieve the above object, the present invention provides a stator core unit, the stator core unit includes:

a stator yoke unit; and

a plurality of stator teeth provided on the stator yoke unit, each of the plurality of stator teeth extending from the stator yoke unit toward the center of the motor, each of the plurality of stator teeth having an arc surface facing the center of the motor, the arc surface extending along a circumferential direction of the stator yoke unit;

the center of the arc surface of each stator tooth part has an eccentric distance relative to the center of the motor; in one stator core unit, the eccentricity of the circle centers of the arc surfaces of the plurality of stator tooth parts relative to the center of the motor is different from each other.

Optionally, the eccentricity of the circle centers of the arc surfaces of the plurality of stator tooth parts relative to the center of the motor is gradually increased along the reverse direction of the first rotating direction; the first rotation direction is a motor rotation direction.

Optionally, the circle centers of the arc surfaces of the plurality of stator tooth portions are sequentially increased along a direction opposite to the first rotation direction relative to the eccentricity of the center of the motor according to a fixed distance;

or the circle centers of the arc surfaces of the plurality of stator tooth parts are sequentially increased along the opposite direction of the first rotating direction relative to the eccentricity of the motor center according to the rule that the distance is changed step by step.

Optionally, each of the stator teeth has a first end and a second end which are oppositely arranged in the circumferential direction of the stator yoke unit, and the relative position distance between the arc surface and the stator yoke unit gradually decreases from the first end to the second end.

Optionally, each of the stator teeth comprises:

a body extending from the stator yoke unit toward the motor center; and

first and second tooth shoes disposed opposite to each other in a circumferential direction of the stator yoke unit;

the end face of the body facing the center of the motor and the end faces of the first tooth shoe and the second tooth shoe facing the center of the motor form the cambered surface.

Optionally, the first tooth shoe and the second tooth shoe are arranged in a direction opposite to the first rotation direction, and a shortest distance between the first tooth shoe of each stator tooth portion and the corresponding cambered surface of the stator yoke unit is greater than or equal to a shortest distance between the second tooth shoe and the stator yoke unit.

Optionally, the stator core unit is a stator punching unit, or is formed by laminating a plurality of stator punching units.

Optionally, the stator yoke unit is arranged in an arc shape or in a ring shape.

The utility model discloses still provide a stator core, stator core includes as above arbitrary one stator core unit.

The utility model discloses still provide a motor, the motor includes as above arbitrary one stator core.

Optionally, the motor further comprises a rotor, the rotor being disposed within the stator core;

or, the rotor is arranged around the outer side of the stator core.

Optionally, when the motor is an interior permanent magnet synchronous motor, the rotor includes:

a rotor core;

the mounting groove is arranged on the rotor iron core;

and the permanent magnet is arranged in the mounting groove and synchronously rotates with the rotor core.

Optionally, when the motor is a surface-mount permanent magnet synchronous motor, the rotor includes:

a rotor core;

and the permanent magnet is arranged on the wall surface of the rotor core facing the stator core.

The utility model discloses still provide a compressor, the compressor includes as above the motor.

The stator core unit of the utility model is provided with a plurality of stator tooth parts on the stator yoke unit, each stator tooth part extends from the stator yoke unit to the center of the motor, each stator tooth part has a cambered surface towards the center of the motor, and the cambered surface is arranged along the circumferential extension of the stator yoke unit; the center of the arc surface of each stator tooth part has an eccentric distance relative to the center of the motor; in one stator core unit, the eccentricity of the circle centers of the arc surfaces of the plurality of stator tooth parts relative to the center of the motor is different from each other. The utility model discloses technical scheme is through the eccentricity at the relative motor center in the centre of a circle of the cambered surface of each stator tooth portion in making the stator core unit, in order when the motor folk prescription is to the operation, make the different air gap magnetic fields that the stator tooth portion of each different eccentricity produced offset each other, in order to reduce the harmonic content in the synthetic magnetic field, thereby the vibration and the noise of motor have been reduced, and then the vibration and the noise problem of unidirectional rotation motor have effectively been solved, and this application has overcome the certain technological bias that will the symmetrical design of stator core unit structure and stator tooth portion structure in the current motor design, utilize the more effectual stability that improves the motor operation of asymmetric structure.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

Fig. 1 is a schematic structural diagram of an embodiment of a stator core according to the present invention;

FIG. 2 is an enlarged view of a portion of FIG. 1 at A;

fig. 3 is a schematic structural diagram of another embodiment of the stator core of the present invention;

fig. 4 is a schematic structural diagram of a rotor in an embodiment of the motor of the present invention;

fig. 5 is a schematic structural diagram of a rotor in another embodiment of the motor of the present invention.

The reference numbers illustrate:

reference numerals	Name (R)	Reference numerals	Name (R)
				10	Stator yoke unit	40	Rotor
20	Stator tooth	41	Rotor core
				30	Stator slot	42	Permanent magnet
21	Body	O	Center of circle
				22	First tooth boot	F1	First direction of rotation
23	Second tooth boot

The objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that all the directional indicators (such as upper, lower, left, right, front and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicator is changed accordingly.

In the present application, unless expressly stated or limited otherwise, the terms "connected" and "fixed" are to be construed broadly, e.g., "fixed" may be fixedly connected or detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In addition, descriptions in the present application as to "first", "second", and the like are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit to the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention.

The utility model provides a stator core unit can be applied to in the motor.

From the perspective of the composition structure, the motor can be considered to be formed by constructing a stator core and a rotor core; but from the functional structure, the motor unit can be regarded as being formed by connecting one or more unit motors with each other end to end. Here, a motor having a stator slot number of Z (hereinafter, the stator slot number is abbreviated as a slot number) and a pole number of 2P (corresponding to a pole pair number of P) will be described, where a unit motor is a simplest structure represented by a slot pole number obtained by removing a greatest common divisor of the slot number (Z) and the pole pair number (P), and the greatest common divisor is a unit motor number. For example: the motor is a 9-slot 6-pole motor, the number of slots is 9, the number of pole pairs is 3, and the common divisor is 3; the number of the slot poles is changed into 3 slots 1 antipodes, namely 3 slots 2 antipodes after the greatest common divisor is removed, so that the structure of the corresponding 3 slots 2 poles in the 9-slot 6-pole motor is a unit motor, and the 9-slot 6-pole motor can also be regarded as being formed by connecting 3 unit motors end to end. The stator core unit in this specification is a stator core portion constituting a unit motor.

At present, when a motor structure is designed by technicians in the field, a design concept commonly adopted is that stator tooth parts of a stator core are arranged in a bilateral symmetry mode, namely, the radial distance between each stator tooth part and the excircle of a motor rotor core is the same, the reason is that the operating working conditions of two rotating directions of the motor are considered, when the motor runs in any rotating direction by adopting the symmetrical structure, a larger harmonic magnetic field can be avoided from being introduced, and meanwhile, the design of the symmetrical structure can reduce the vibration and the noise of the motor to a certain extent. However, the effect of the symmetrical structure on reducing the vibration is not significant, and thus the vibration is not improved much, and the noise is not reduced effectively. The drawback of this symmetrical design is more pronounced in unidirectional rotating electrical machines such as compressors. Based on this, this application provides a brand-new stator core design concept, solves the problem that traditional symmetrical stator structural design is not applicable to unidirectional rotating electrical machines.

Fig. 1 shows that the stator core in the illustrated embodiment is composed of three identical stator core units (fig. 1 and 3 have 3 segments of first connecting arc-shaped dashed lines, and any segment of arc-shaped dashed line represents the structural range of a unit motor). Each stator core unit sequentially comprises a stator tooth part 11, a stator tooth part 12 and a stator tooth part 13 along a first rotating direction; the center of the arc of each stator tooth 20 has an eccentricity with respect to the center of the motor, and the eccentricities of the stator teeth 20 are different from each other. It can be understood that when the stator yoke part in the motor is in a circular ring shape, the center of the motor usually overlaps with the circle center of the stator yoke part unit and the circle center of the rotor; when the stator yoke part is not in a circular ring shape, the center of the motor is usually overlapped with the center of the stator yoke part unit and the center of the rotor; the present specification explains an example in which the yoke portion of the stator is formed in a circular ring shape. The eccentricity described in the present application is characterized by: the relative distance between the circle center of the arc surface of each stator tooth part and the center of the motor is large or small. It should be noted that, in the same stator core unit, the centers of the arcs of the stator teeth are not necessarily on the same straight line.

Fig. 2 is a partially enlarged view of a portion a in fig. 1. The eccentricity of the stator tooth portion 11 is maximum a 1; the eccentricity a3 of the stator tooth portion 13 is minimum, and the eccentricity is 0; the eccentricity a2 of the stator tooth 12 is between the two stator teeth 11 and 13.

In the embodiment shown in fig. 3, the stator core is formed of three identical stator core units (again indicated by three first-connected dashed lines); wherein L1, L2 and L3 are the maximum distances from the second tooth shoe 23 of each stator tooth 20 in a stator core unit to the motor rotor core 41, and L1 is greater than L2; l2 is greater than L3.

Referring to fig. 1 to 3, in an embodiment of the present invention, the stator core unit includes:

a stator yoke unit 10; and

a plurality of stator teeth 20 provided on the stator yoke unit 10, each of the plurality of stator teeth 20 extending from the stator yoke unit 10 to the motor center, each of the plurality of stator teeth 20 having an arc surface facing the motor center, the arc surface extending along a circumferential direction of the stator yoke unit 10;

the center of the arc surface of each stator tooth part 20 has an eccentricity relative to the center of the motor; in one stator core unit, the eccentricity of the center of the arc surface of the plurality of stator teeth 20 with respect to the center of the motor is different from each other.

In this embodiment, the stator yoke unit 10 may be an annular silicon steel sheet, or an arc-shaped silicon steel sheet. The plurality of stator teeth 20 may be uniformly spaced on the stator yoke unit 10 and may be respectively extended toward the center of the motor. An end of each stator tooth 20 facing the center of the motor, i.e., an end away from the stator yoke unit 10, may have a circular arc shape, and the circular arc may extend in the direction of the arc of the stator yoke unit 10 itself, i.e., in the circumferential direction of the stator yoke unit 10.

It will be appreciated that each arc may be considered to lie on a standard circle. Present is the stator tooth 20 that bilateral symmetry set up in the motor, the radial distance of each stator tooth 20 apart from rotor core 41 excircle is the same, it is equal to each stator tooth 20 apart from the equal distance of stator yoke unit 10, the cambered surface that each stator tooth 20 kept away from stator yoke unit 10 one end is unanimous with stator yoke unit 10 self arc promptly, also the centre of a circle of cambered surface place circle of stator tooth 20 is the same with the motor center (the centre of a circle of stator yoke unit 10 self arc place circle), the eccentricity of both circles is zero this moment.

And the utility model discloses technical scheme is inconsistent through the arc that makes the cambered surface that each stator tooth portion 20 has and stator yoke portion unit 10 self, even the arc that each stator tooth portion 20 has personally submits left right asymmetric design to the centre of a circle that makes the cambered surface place circle of each stator tooth portion 20 skew motor center one respectively and predetermine the distance, even the relative motor center in the centre of a circle of the cambered surface of each stator tooth portion 20 has an eccentricity. It will also be understood that the eccentricity of the arc surfaces with respect to the center of the motor, i.e. the distance from the arc surfaces to the rotor core 41 in the motor, may be different by making the arc surfaces of each stator tooth 20 different from each other.

Therefore, when the motor runs in a single direction, because the distances from the cambered surfaces of the stator tooth parts 20 to the rotor 40 are different, the air gaps between the stator tooth parts 20 and the rotor 40 in each unit motor are also different, the air gap magnetic fields generated correspondingly by different air gaps are also different, and a counteracting effect exists between different air gap magnetic fields, so that the total air gap magnetic field in each unit motor can be reduced, the harmonic content in the synthetic magnetic field of the motor can be reduced, and the effect of greatly reducing the vibration and the noise of the motor can be achieved.

The stator core unit of the utility model is provided with a plurality of stator teeth 20 on the stator yoke unit 10, each stator tooth 20 extends from the stator yoke unit 10 to the center of the motor, each stator tooth 20 has a cambered surface facing the center of the motor, and the cambered surface is arranged along the circumferential extension of the stator yoke unit 10; the center of the arc surface of each stator tooth part 20 has an eccentric distance relative to the center of the motor; in one stator core unit, the eccentricity of the center of the arc surface of the plurality of stator teeth 20 with respect to the center of the motor is different from each other. The utility model discloses technical scheme is through the eccentricity at the relative motor center in the centre of a circle of the cambered surface of each stator tooth portion 20 in making the stator core unit, in order when the motor folk prescription is to the operation, make the different air gap magnetic fields that the stator tooth portion 20 of each different eccentricity produced offset each other, in order to reduce the harmonic content in the synthetic magnetic field, thereby the vibration and the noise of motor have been reduced, and then the vibration and the noise problem of unidirectional rotation motor have effectively been solved, and this application has overcome the certain technological bias that will the symmetrical design of stator core unit structure and stator tooth portion 20 structure in the current motor design, utilize the more effectual stability that improves the motor operation of asymmetric structure.

Referring to fig. 1 to 3, in an embodiment of the present invention, the eccentricity of the arc surfaces of the plurality of stator teeth 20 with respect to the center of the motor gradually increases along a direction opposite to a first rotation direction, which is a motor rotation direction.

In this embodiment, the rotation direction of the motor to which the stator core unit is applied may be set to a first rotation direction, and the opposite direction of the first rotation direction may be selected as a reference direction in which each stator tooth 20 in the stator core unit is disposed. The utility model discloses technical scheme sets up to the crescent along the opposite direction of first direction of rotation through the eccentricity with each stator tooth portion 20 in the stator core unit, so that the air gap magnetic field that each stator tooth portion 20 and rotor 40 formed in the stator core unit reduces along the motor direction of rotation gradually, and then make and offset each other between the different air gap magnetic fields, and the accessible is experimental in advance many times and is acquireed the best increase range between each eccentricity, come the air gap magnetic field in the stator core unit will be minimum, thereby can the biggest harmonic content in the reduction synthetic magnetic field, in order to reach and fall to minimumly with motor vibration and noise, and show the effect that improves load torque waveform.

Referring to fig. 1 to 3, in an embodiment of the present invention, the eccentricity of the arc surfaces of the plurality of stator teeth 20 with respect to the center of the motor increases in the opposite direction of the first rotation direction according to a fixed distance;

or, the center of the arc surface of the plurality of stator teeth 20 increases in sequence in the opposite direction of the first rotation direction from the eccentricity of the motor center according to the rule that the distance changes step by step.

In this embodiment, the modes of sequentially increasing the eccentricity in the direction opposite to the first rotation direction may be divided into two types, the first mode is sequentially increasing at fixed distance intervals; the second is that the distance intervals are increased in sequence. In fig. 1 and 2, the counterclockwise rotation direction of the 9-slot 6-pole motor is taken as an example for explanation, and in fig. 1 and 2, the eccentricity a3, a2 and a3 sequentially increases in the clockwise direction, and the first increasing mode is as follows: the distance difference between a3 and a2 is consistent with the distance difference between a2 and a 1; the second increase mode is: the difference in the distance between a3 and a2 is not the same as the difference in the distance between a2 and a 1. The distance interval of the second increasing mode can be gradually increased; alternatively, the distance interval may also be reduced stepwise; alternatively, the distance interval may also be a jump change as described above, and is not limited herein. Of course, in other embodiments, the eccentricity of each stator tooth 20 in the stator core unit can also be reduced sequentially according to the above two rules. In this way, in the first mode, a designer only needs to determine the distance interval of the first preset distance increase in the opposite direction of the motor rotation direction in one stator core unit in the motor design stage, so that the design time and the cost of batch production are saved; and the second mode can be when design and batch manufacturing stage error appear, and the nimble eccentricity of changing follow-up stator tooth portion 20 realizes the utility model discloses technical scheme.

Referring to fig. 1 to 3, in an embodiment of the present invention, each of the stator teeth 20 has a first end and a second end oppositely disposed along a circumferential direction of the stator yoke unit 10, and a relative position distance between the arc surface and the stator yoke unit 10 gradually decreases from the first end to the second end.

In the present embodiment, the first end and the second end are both ends on the arc surface of the stator teeth 20 toward the center of the motor, and the first end and the second end are determined according to the first rotation direction, i.e., the motor rotation direction. When the first rotating direction is counterclockwise, the first end is the end on the left side of the arc surface of the stator tooth part 20, and the second end is the end on the right side of the arc surface of the stator tooth part 20; when the first rotation direction is clockwise, the first end is the right end of the arc surface of the stator tooth portion 20, and the second end is the left end of the arc surface of the stator tooth portion 20.

The first rotation direction is taken as a counterclockwise direction for explanation. When the first rotation direction is counterclockwise, the relative distance between the first end of each stator tooth portion 20 and the stator yoke unit 10 is the longest distance therebetween, the relative distance between the second end of each stator tooth portion 20 and the stator yoke unit 10 is the shortest distance therebetween, and the first end and the second end are connected by a curved surface, so that the relative distance between any point on the curved surface and the stator yoke unit 10 gradually decreases from the first end to the second end. When the first rotation direction is clockwise, the positions of the first end and the second end on the stator tooth portion 20 are opposite, and are not described herein.

For the whole stator core unit, the relative distances between the first end and the second end of each stator tooth 20 and the stator yoke unit 10 may be different, and it is only necessary to satisfy that the eccentricity of each stator tooth 20 is gradually increased along the opposite direction of the motor rotation direction. Of course, in other embodiments, the eccentricity of any stator tooth 20 can also be adjusted by fixing the relative distance between any one of the first end or the second end of all the stator teeth 20 and the stator yoke unit 10, and only controlling the relative distance between the other of all the stator teeth 20 and the stator yoke unit 10. The utility model discloses a distance between making each stator tooth portion 20 and the stator yoke portion unit 10 reduces from its first end to second end gradually, can make the centre of a circle of the cambered surface of each stator tooth portion 20 respectively with relative motor center skew an eccentricity.

Referring to fig. 1 to 3, in an embodiment of the present invention, each of the stator teeth 20 includes:

a body 21 extending from the stator yoke unit 10 toward the motor center; and

first and second tooth shoes 22 and 23 oppositely disposed in a circumferential direction of the stator yoke unit 10;

the end surface of the body 21 facing the center of the motor and the end surfaces of the first and second tooth shoes 22 and 23 facing the center of the motor constitute the arc surfaces.

In this embodiment, one end of the body 21 of the stator tooth portion 20 is connected to the stator yoke unit 10, and the other end extends along the center of the motor to form a protruded tooth structure, and an end surface of the body 21 facing the center of the motor is an arc surface. The first tooth shoe 22 and the second tooth shoe 23 can be respectively arranged on two opposite sides of one end of the stator tooth part 20 far away from the stator yoke part unit 10, the first tooth shoe 22 can be connected with the side face of the first end of the stator tooth part 20, the second tooth shoe 23 can be connected with the side face of the second end of the stator tooth part 20, the end faces, facing the center of the motor, of the first tooth shoe 22 and the second tooth shoe 23 are cambered surfaces, and the cambered surfaces of the body 21 jointly form a cambered surface, facing the center of the motor, of the stator tooth part 20. The utility model discloses technical scheme is through setting up first tooth boots 22 and second tooth boots 23 on the body 21 of stator tooth portion 20, can increase each stator tooth portion 20 and electric motor rotor 40's relative area, makes the air gap magnetic field that each stator tooth portion 20 produced more accurate to be favorable to the at utmost to reduce harmonic content, load vibration and noise in the synthetic magnetic field of motor, and improve load torque waveform.

Referring to fig. 1 to 3, in an embodiment of the present invention, the first tooth shoe 22 and the second tooth shoe 23 are disposed in a direction opposite to the first rotation direction, and a shortest distance between the corresponding arc surface of the first tooth shoe 22 of each stator tooth portion 20 and the stator yoke unit 10 is greater than or equal to a shortest distance between the second tooth shoe 23 and the stator yoke unit 10.

In this embodiment, in the stator tooth portion 20, the first tooth shoe 22 and the second tooth shoe 23 may be sequentially disposed on two opposite sides of the stator tooth portion 20 body 21 in the opposite direction of the first rotation direction, and respectively extend into the corresponding stator slot portions 30. It can be understood that, since the tooth shoes are shoe-shaped, each point on the arc surface corresponding to the first tooth shoe 22 is closer to the stator tooth portion 20 body 21 and the distance between the tooth portion and the stator yoke unit 10 is shorter; the same is true for each point on the arc corresponding to the second tooth shoe 23. And the utility model discloses technical scheme is through making the shortest distance between first tooth boots 22 corresponding ground cambered surface and the stator yoke unit 10 be greater than or equal to the shortest distance between second tooth boots 23 and the stator yoke unit 10, can make in each stator tooth portion 20 first tooth boots 22 more be close to electric motor rotor 40 than second tooth boots 23, and then can make each air gap magnetic field that a plurality of stator tooth portions 20 formed reduce along motor direction of rotation gradually to be favorable to reducing the harmonic content in the synthetic magnetic field.

Referring to fig. 3, the present invention provides a stator core unit, wherein the shortest distance from the arc surface of the first tooth shoe 22 to the stator yoke unit 10 in each stator tooth portion 20 is unchanged by controlling the reverse direction of the first rotation direction in the stator core unit, and the shortest distance from the arc surface of the second tooth shoe 23 to the stator yoke unit 10 in each stator tooth portion 20 is gradually increased, so as to achieve the effect that the eccentricity of the plurality of stator tooth portions 20 is sequentially increased along the reverse direction of the first rotation direction, that is, L3 is greater than L2, L2 is greater than L1, and L1 is greater than or equal to the shortest distance from the arc surface of the first tooth shoe 22 to the stator yoke unit 10. It should be noted that the shortest distance from the arc surface corresponding to the second tooth shoe 23 to the stator yoke unit 10 can only be increased to the maximum as that of the first tooth shoe 22, otherwise it cannot be cancelled by the air gap magnetic field generated by other stator teeth 20 in the same stator core unit.

Referring to fig. 1 to 3, in an embodiment of the present invention, the stator core unit is a stator punching unit, or is formed by laminating a plurality of stator punching units.

In this embodiment, the stator punching unit may be a large silicon steel sheet with a relatively large thickness, that is, the stator yoke unit 10 and the plurality of stator teeth 20 are integrally formed. The stator punching sheet units can also be small-sized silicon steel sheets with smaller thickness, each stator punching sheet unit is provided with a stator yoke portion unit 10 and a plurality of stator tooth portions 20, and the stator punching sheet units can be aligned and then are subjected to punching, stacking and compressing to form a stator core unit 11 with certain thickness. So set up, be favorable to improving the utility model discloses the production flexibility of stator core unit.

Referring to fig. 1 to 3, in an embodiment of the present invention, the stator yoke unit 10 is disposed in an arc shape or in an annular shape.

In this embodiment, when the number of unit motors in the motor is greater than 1, the stator yoke unit 10 may be arc-shaped; a plurality of stator yoke units 10 may be spliced end to form a circular stator core. Alternatively, when the number of unit motors in the motor is equal, that is, when the motor is composed of only one unit motor, the motor includes only one stator yoke unit 10 having a ring shape, for example: 12 slot 10 pole motor. It should be noted that, when the stator yoke unit 10 is provided in a ring shape, the stator yoke unit 10 and the plurality of stator teeth 20 are provided as an integral molding. The utility model discloses technical scheme sets up to the arc or be the annular through with stator yoke portion unit 10 to make it can carry out nimble adjustment according to actual production in stator core's concrete structure.

The utility model discloses still provide a stator core, this stator core includes as above 12 units of stator core. The detailed structure of the stator core unit can refer to the above embodiments, and is not described herein again; it can be understood that, because the stator core unit is used in the stator core, the embodiment of the stator core includes all technical solutions of all embodiments of the stator core unit, and the achieved technical effects are also completely the same, and are not described herein again.

The utility model discloses still provide a motor, can be applied to in electric automobile, fan, lampblack absorber, water pump or the compressor. The electric machine comprises a stator core as described above. The detailed structure of the stator core can refer to the above embodiments, and is not described herein again; it can be understood that, because the stator core is used in the stator core, the embodiment of the stator core includes all technical solutions of all embodiments of the stator core, and the achieved technical effects are also completely the same, and are not described herein again.

In this embodiment, a winding coil may be wound around each stator tooth 20 in the stator core, so that a stator winding is formed on each stator tooth 20. The winding coils are controlled by the motor control device to respectively pass three-phase alternating currents according to a certain energizing logic, and are used for forming a magnetic field in the motor when the three-phase alternating currents pass so as to drive a rotating component in the motor, such as the rotor 40, to rotate.

Referring to fig. 1 to 3, in an embodiment of the present invention, the motor further includes a rotor 40, and the rotor 40 is disposed in the stator core;

alternatively, the rotor 40 is enclosed outside the stator core.

In this embodiment, the rotor 40 may be formed by punching and compressing the punching sheet of the rotor 40. When the rotor 40 is arranged in the stator core, the rotor 40 can be a nearly cylindrical body, the center of the rotor 40 can be provided with a shaft hole penetrating through the rotor 40 along the axial direction of the rotor, and the shaft hole is used for installing a rotating shaft; the rotor 40 is used for driving the rotating shaft to rotate synchronously when the rotor is driven by the magnetic field generated by the stator core. Alternatively, the rotor 40 may also be disposed outside the stator core, and enclosed outside the stator core, so as to form an outer rotor 40 motor with the stator core. Therefore, the utility model discloses a with rotor 40 and the cooperation of aforementioned stator core, can reduce motor vibration and noise to and improve under the effect prerequisite of load torque waveform, further improve the stability of 40 operating modes of electric motor rotor.

Referring to fig. 5, in an embodiment of the present invention, when the motor is an interior permanent magnet synchronous motor, the rotor 40 includes:

a rotor core 41;

an installation groove provided on the rotor core 41;

and the permanent magnet 42 is arranged in the mounting groove, and the permanent magnet 42 and the rotor core 41 rotate synchronously.

Fig. 5 is a schematic structural diagram of a rotor core 41 and a permanent magnet 42 in an embodiment of the present invention when the motor is an interior permanent magnet synchronous motor. In this embodiment, the mounting grooves may be straight grooves, and the number of the mounting grooves is determined according to actual needs, and is not limited herein. A plurality of mounting grooves may be evenly divided in a plurality of directions of the rotor core 41, and each mounting groove may be used to mount one permanent magnet 42 in an adhesive manner. The mounting grooves are preferably arranged pairwise to form a V-shaped structure, and the V-shaped structure and the edge of the outer circle of the rotor core 41 can form a magnetic isolation bridge, so that the saturation of magnetic lines of force is improved. It is understood that the permanent magnets 42 are synchronized with the rotation of the rotor core 41 when the rotor core 41 rotates. So set up, can make the utility model discloses be applied to built-in PMSM to it is lower to obtain motor vibration and noise, and the better built-in PMSM of effect of load torque waveform.

Referring to fig. 4, in an embodiment of the present invention, when the motor is a surface-mount permanent magnet synchronous motor, the rotor 40 includes:

a rotor core 41;

and a permanent magnet 42 provided on a wall surface of the rotor core 41 facing the stator core.

Fig. 4 is a schematic structural diagram of a rotor core 41 and a permanent magnet 42 in an embodiment of the motor when the motor of the present invention is a surface-mounted permanent magnet synchronous motor. In this embodiment, the permanent magnets 42 are provided on the outer peripheral wall of the rotor core 41, that is, the wall surface of the rotor core 41 facing the stator core. So, can make the utility model discloses be applied to surface-mounted permanent magnet synchronous motor to it is lower to obtain motor vibration and noise, and the better surface-mounted permanent magnet synchronous motor of effect of load torque waveform.

The utility model discloses still provide a compressor, the compressor includes as above the motor. The detailed structure of the motor can refer to the above embodiments, and is not described herein; it can be understood that, because the motor is used, the embodiment of the motor includes all technical solutions of all embodiments of the motor, and the achieved technical effects are also completely the same, and are not described herein again.

The above is only the optional embodiment of the present invention, and not the scope of the present invention is limited thereby, all the equivalent structure changes made by the contents of the specification and the drawings are utilized under the inventive concept of the present invention, or the direct/indirect application in other related technical fields is included in the patent protection scope of the present invention.

Claims (14)

1. A stator core unit for an electrical machine, the stator core unit comprising:

a stator yoke unit; and

a plurality of stator teeth provided on the stator yoke unit, each of the plurality of stator teeth extending from the stator yoke unit toward the center of the motor, each of the plurality of stator teeth having an arc surface facing the center of the motor, the arc surface extending along a circumferential direction of the stator yoke unit;

the center of the arc surface of each stator tooth part has an eccentric distance relative to the center of the motor; in one stator core unit, the eccentricity of the circle centers of the arc surfaces of the plurality of stator tooth parts relative to the center of the motor is different from each other.

2. The stator core unit according to claim 1, wherein eccentricity of a center of a curved surface of a plurality of the stator teeth with respect to a center of the motor is gradually increased in a direction opposite to a first rotation direction; the first rotation direction is a motor rotation direction.

3. The stator core unit according to claim 2, wherein the eccentricity of the arc surfaces of the plurality of stator teeth with respect to the center of the motor in the opposite direction of the first rotation direction increases in order of magnitude of the fixed distance;

or the circle centers of the arc surfaces of the plurality of stator tooth parts are sequentially increased along the opposite direction of the first rotating direction relative to the eccentricity of the motor center according to the rule that the distance is changed step by step.

4. The stator core unit according to claim 2, wherein each of the stator teeth has a first end and a second end which are oppositely disposed in a circumferential direction of the stator yoke unit, and a relative positional distance between the arc surface and the stator yoke unit is gradually reduced from the first end to the second end.

5. The stator core unit of claim 1, wherein each of the stator teeth comprises:

a body extending from the stator yoke unit toward the motor center; and

first and second tooth shoes disposed opposite to each other in a circumferential direction of the stator yoke unit;

the end face of the body facing the center of the motor and the end faces of the first tooth shoe and the second tooth shoe facing the center of the motor form the cambered surface.

6. The stator core unit according to claim 5, wherein the first and second tooth shoes are disposed in a direction opposite to the first rotational direction, and a shortest distance between the first tooth shoe of each of the stator teeth and the corresponding arc surface of the stator yoke unit is greater than or equal to a shortest distance between the second tooth shoe and the stator yoke unit.

7. The stator core unit according to claim 1, wherein the stator core unit is a stator punching unit, or is formed by laminating a plurality of stator punching units.

8. A stator core unit according to any one of claims 1-7, characterized in that the stator yoke unit is arranged in an arc shape or in a ring shape.

9. A stator core, characterized in that the stator core comprises a stator core unit according to any one of claims 1-8.

10. An electrical machine, characterized in that the electrical machine comprises a stator core according to claim 9.

11. The electric machine of claim 10, further comprising a rotor disposed within the stator core;

or, the rotor is arranged around the outer side of the stator core.

12. The electric machine of claim 11, wherein when the electric machine is an interior permanent magnet synchronous machine, the rotor comprises:

a rotor core;

the mounting groove is arranged on the rotor iron core;

and the permanent magnet is arranged in the mounting groove and synchronously rotates with the rotor core.

13. The motor of claim 11, wherein when the motor is a surface mount permanent magnet synchronous motor, the rotor comprises:

a rotor core;

and the permanent magnet is arranged on the wall surface of the rotor core facing the stator core.

14. A compressor, characterized in that it comprises an electric motor according to any one of claims 10-13.

Images