CN113872352B - Motor structure, compressor structure and refrigeration equipment - Google Patents

Motor structure, compressor structure and refrigeration equipment Download PDF

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Publication number
CN113872352B
CN113872352B CN202111200157.5A CN202111200157A CN113872352B CN 113872352 B CN113872352 B CN 113872352B CN 202111200157 A CN202111200157 A CN 202111200157A CN 113872352 B CN113872352 B CN 113872352B
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Prior art keywords
stator
core
stator core
rotor
motor
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CN113872352A (en
Inventor
李宏涛
于岚
邱小华
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Guangdong Meizhi Compressor Co Ltd
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Guangdong Meizhi Compressor Co Ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/12—Stationary parts of the magnetic circuit
    • H02K1/14—Stator cores with salient poles
    • H02K1/146—Stator cores with salient poles consisting of a generally annular yoke with salient poles
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22—Rotating parts of the magnetic circuit
    • H02K1/27—Rotor cores with permanent magnets
    • H02K1/2706—Inner rotors
    • H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
    • H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K2213/00—Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
    • H02K2213/03—Machines characterised by numerical values, ranges, mathematical expressions or similar information

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)

Abstract

An embodiment of the present invention provides a motor structure, a compressor structure, and a refrigeration apparatus, wherein the motor structure includes: the stator assembly comprises a stator core, the stator core comprises a stator yoke and a plurality of stator teeth, a winding groove is formed between two adjacent stator teeth, and a stator winding is arranged in the winding groove; the rotor assembly is coaxially arranged with the stator assembly and comprises a rotor iron core and permanent magnets arranged on the rotor iron core; the relationship among the number Q of stator teeth, the outer diameter D1 of the stator core, the inner diameter D2 of the stator core, the thickness Hj of the stator yoke of the stator core and the thickness h of the permanent magnet is: According to the technical scheme, under the condition that the demagnetizing rate of the magnet and the motor efficiency are ensured, the rotational inertia of the motor rotor and the low-frequency energy efficiency of the compressor are improved, so that the product competitiveness of the motor structure is greatly improved.

Description

Motor structure, compressor structure and refrigeration equipment
Technical Field
The invention relates to the technical field of motors, in particular to a motor structure, a compressor structure and refrigeration equipment.
Background
In the design of the current rotary direct current variable frequency compressor motor, in order to reduce the cost, a mode of reducing the motor thickness and the use amount of the permanent magnets is mainly adopted, however, when the cost is reduced by adopting the method, certain negative effects are generated on the size of the rotor and the motor efficiency.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems existing in the prior art or related art.
In view of this, embodiments of the first aspect of the present invention provide a motor structure.
Embodiments of the second aspect of the present invention provide a compressor structure.
Embodiments of a third aspect of the present invention provide a refrigeration appliance.
To achieve the above object, an embodiment of a first aspect of the present invention provides a motor structure, including: the stator assembly comprises a stator core, the stator core comprises a stator yoke and a plurality of stator teeth extending inwards from the stator yoke along the radial direction, the plurality of stator teeth are circumferentially distributed around the axis of the stator core, a winding groove is formed between two adjacent stator teeth, and a stator winding is arranged in the winding groove; the rotor assembly is coaxially arranged with the stator assembly and comprises a rotor iron core and permanent magnets arranged on the rotor iron core; the relationship among the number Q of stator teeth, the outer diameter D1 of the stator core, the inner diameter D2 of the stator core, the thickness Hj of the stator yoke of the stator core and the thickness h of the permanent magnet is:
According to the motor structure provided by the embodiment of the first aspect of the invention, the motor structure comprises two parts of a stator assembly and a rotor assembly, wherein the stator core comprises a stator yoke and stator teeth which are respectively arranged on the radial outer side and the radial inner side, and the stator yoke and the stator teeth are connected, so that when the stator teeth are wound to be provided with stator windings in winding grooves, the rotor assembly can be driven by a normal magnetic field, and further the rotation of the rotor assembly is realized. Specifically, the rotor assembly and the stator assembly are coaxially arranged, and mainly comprise a rotor iron core and a permanent magnet, for the rotor assembly, the size of the rotor assembly is related to the inner diameter of the stator iron core, namely the diameter of a circle surrounded by the inner edges of tooth shoes of stator teeth, and under the condition of limited cost, the rotor assembly is inevitably reduced in size, the rotational inertia is influenced to a certain extent, at the moment, the thickness of an inner diameter and an outer diameter of the stator iron core, the thickness of a stator yoke and the thickness of the permanent magnet and the number of the stator teeth are limited, under the condition of the same outer diameter, the stator iron core with a larger inner diameter can be selected, at the moment, the thickness of the stator yoke can also be selected to be thinner in size, and the rotational inertia of a motor rotor and the low-frequency energy efficiency of a compressor can be improved under the condition of guaranteeing the demagnetizing rate of the magnet and the motor efficiency, so that the product competitiveness of the motor structure is greatly improved.
The axis of the stator core is collinear with the axis of the rotor core, and the stator teeth and the permanent magnets are all arranged around the axis and are generally uniformly arranged.
In some embodiments, the motor is an integer slot motor.
In other embodiments, fractional slot motors are used, where the motor operates on harmonics.
In addition, the motor structure in the scheme provided by the invention can also have the following additional technical characteristics:
in the above technical solution, the relationship between the number Q of stator teeth and the pole pair number p of the permanent magnet and the phase number m of the motor structure is:
In the technical scheme, the number of the stator teeth is limited to be smaller than 2 times of the product of the pole logarithm of the rotor and the phase number of the motor, so that the fractional slot motor is integrally formed, the higher harmonic potential generated by non-sinusoidal distribution of the magnetic pole magnetic field can be effectively weakened under the action of the fractional slot motor, the amplitude of the tooth harmonic potential can be weakened, and the waveform is improved. In addition, the motor with fractional slot can reduce the pulse amplitude value of magnetic flux effectively to reduce the pulse loss of magnetic pole surface.
In the technical scheme, projection contour lines of the permanent magnets are symmetrical with respect to central axes of two adjacent stator teeth on the end face of the rotor core; wherein the permanent magnet comprises one or a combination of the following: straight line segment, curve segment.
In the technical scheme, the cross section shape of the permanent magnet is limited to be of a symmetrical pattern so as to facilitate processing and installation, and particularly, the permanent magnet comprises any combination of three shapes and can be a pure straight line segment, and in this case, under the condition of limited symmetry, the projection contour line of the permanent magnet is vertical to the central axis. In another case, the permanent magnet may be a symmetrical straight line segment, or may be understood as a broken line segment, where the probability of projecting the contour line is high, including but not limited to V-shape, W-shape, etc. In another case, the permanent magnet is a pure curve segment, and the permanent magnet still needs to maintain a symmetrical shape, which can be a single arc or a combination of multiple arcs.
Of course, a combination of curved and straight line segments may be used as long as the structure is symmetrical.
Furthermore, the motor is in a large slot pole matching relationship, the number of the stator teeth is not less than 9, and the number of the permanent magnets is not less than 8, so that the large slot poles of the motor are matched, and the inner diameter and the outer diameter of the stator core, the thickness of the stator yoke and the permanent magnets and the number of the stator teeth are limited, and meanwhile, the rotational inertia of the motor rotor and the low-frequency energy efficiency of the compressor are improved under the condition that the demagnetizing rate of the magnets and the motor efficiency are ensured, so that the product competitiveness of the motor structure is greatly improved.
Still further, the number of stator teeth is no greater than 12.
In the technical scheme, the ratio between the inner diameter of the stator core and the outer diameter of the stator core is not smaller than 0.59.
In this technical scheme, through restricting the ratio between stator core's internal diameter and the external diameter, can make stator core enclose the space of rotor core that becomes great, more be convenient for to, under the circumstances of guaranteeing magnet demagnetizing rate and motor efficiency, improve motor rotor's moment of inertia and compressor low frequency energy efficiency to greatly improve motor structure's product competitiveness.
Further, the upper limit of the ratio of the inner diameter to the outer diameter of the stator core is 0.6.
In the technical scheme, the outer diameter of the stator core is not smaller than 80mm and not larger than 110mm.
In the technical scheme, the outer diameter of the stator core is limited in size, so that the consideration of motor efficiency, demagnetizing rate, moment of inertia and low-frequency energy efficiency can be realized on the small-size motor, and the product competitiveness of the small-size motor is improved.
In the above technical scheme, the rotor core specifically includes: the rotor punching sheets are stacked along the axial direction of the rotor core.
In the technical scheme, the rotor core is formed by axially laminating a plurality of rotor punching sheets, and each rotor punching sheet is provided with a permanent magnet so as to move under the action of a vector magnetic field generated by the stator assembly, thereby realizing the rotor action.
Further, the rotor punching sheet is made of a silicon steel sheet or other soft magnetic material sheet, and the thickness is not more than 0.35mm.
In the above technical scheme, the stator core specifically includes: the stator punching sheets are stacked along the axial direction of the stator core.
In the technical scheme, the stator core is formed by axially laminating a plurality of stator punching sheets, each stator punching sheet is provided with a stator yoke, stator teeth and winding grooves, the stator teeth are arranged on the stator yoke, and the winding grooves are formed between two adjacent stator teeth so that stator windings are wound on the winding grooves, and a magnetic field can be generated for a rotor to realize the stator effect.
Further, the rotor punching sheet is made of a silicon steel sheet or other soft magnetic material sheet, and the thickness is not more than 0.35mm.
In the above technical scheme, the relationship among the outer diameter D1 of the stator core, the inner diameter D2 of the stator core, the thickness w of the permanent magnet and the thickness h of the permanent magnet is:
0.045≤(D2/D1)/(h×w)≤0.055。
In the technical scheme, the ratio between the inner diameter D2 and the outer diameter D1 of the stator core and the approximate projection area of the permanent magnet are determined firstly by limiting the ratio between the inner diameter and the outer diameter of the stator core and the approximate projection area of the permanent magnet on the cross section of the stator core, then the product between the thickness and the width of the permanent magnet is determined, and the magnet consumption can be reduced, the rotational inertia of the motor rotor can be improved, and the low-frequency energy efficiency of the compressor can be improved under the condition that the demagnetizing rate of the magnet and the motor efficiency are ensured by limiting the ratio between the inner diameter D2 and the outer diameter D1 of the stator core.
Further, D2/D1 is more than or equal to 0.59 and less than or equal to 0.60, and h multiplied by w is more than or equal to 10.73 and less than or equal to 13.3.
Further, the specific size of the permanent magnet is limited, and h is more than or equal to 1.3 and less than or equal to 1.6,6.7 and w is more than or equal to 10.2.
An embodiment of the second aspect of the present invention provides a compressor structure including: a housing; the motor structure according to the first aspect is disposed in the housing.
According to the compressor structure provided by the embodiment of the second aspect of the present invention, the compressor structure comprises a housing and a motor structure arranged in the housing, and the motor structure in the first aspect is arranged in the compressor structure, so that the compressor structure has the beneficial effects of the motor structure and is not described herein again.
An embodiment of a third aspect of the present invention provides a refrigeration apparatus comprising: a case; the compressor of the second aspect is provided in the casing.
According to the second aspect of the present invention, the refrigeration device includes a case and a compressor structure disposed in the case, and the compressor structure in the second aspect is disposed in the refrigeration device, so that the refrigeration device has the beneficial effects of the compressor structure and is not described herein.
Among them, the refrigerating apparatus includes, but is not limited to, apparatuses having a refrigerating function such as a refrigerator, a freezer, an air conditioner, and the like.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, or may be learned by practice of the invention.
Drawings
Fig. 1 shows a schematic structural view of a motor structure according to an embodiment of the present invention;
FIG. 2 shows a schematic structural view of a motor structure according to one embodiment of the invention;
fig. 3 shows a schematic structural view of a stator core according to an embodiment of the present invention;
fig. 4 shows a schematic structural view of a rotor core according to an embodiment of the present invention;
FIG. 5 shows a schematic structural view of a compressor structure according to an embodiment of the present invention;
fig. 6 shows a schematic structural view of a refrigeration apparatus according to an embodiment of the present invention.
The correspondence between the reference numerals and the component names in fig. 1 to 6 is:
100: a motor structure; 102: a stator assembly; 1022: a stator core; 1023: a stator yoke; 1024: stator teeth; 1026: a wire winding groove; 1028: a stator winding; 1030: stator punching; 104: a rotor assembly; 1042: a rotor core; 1044: a permanent magnet; 1046: a permanent magnet slot; 1048: rotor punching; 200: a compressor structure; 202: a housing; 300: a refrigeration device; 302: a box body.
Detailed Description
In order that the above-recited objects, features and advantages of embodiments of the present application can be more clearly understood, a further detailed description of embodiments of the present application will be rendered by reference to the appended drawings and detailed description thereof. It should be noted that, without conflict, the embodiments of the present application and features in the embodiments may be combined with each other.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application, but embodiments of the application may be practiced otherwise than as described herein, and therefore the scope of the application is not limited to the specific embodiments disclosed below.
Some embodiments according to the present invention are described below with reference to fig. 1 to 6.
Example 1
As shown in fig. 1 and 2, the motor structure 100 according to the present embodiment includes two parts, namely a stator assembly 102 and a rotor assembly 104, wherein, for the stator core 1022, a stator yoke 1023 and a stator tooth 1024 are respectively disposed on the radial outside and the radial inside, and a connection relationship exists between the stator yoke 1023 and the stator tooth 1024, so that when the stator tooth 1024 is wound to form the stator winding 1028 in the winding slot 1026, a normal magnetic field driving effect can be performed on the rotor assembly 104, and further, the rotation of the rotor assembly 104 is realized. Specifically, the rotor assembly 104 is coaxially disposed with the stator assembly 102 and mainly includes two parts including a rotor core 1042 and a permanent magnet 1044, for the rotor assembly 104, the size of the rotor assembly is related to the inner diameter of the stator core 1022, that is, the diameter of a circle surrounded by the inner edges of the tooth shoes of the stator teeth 1024, and in the case of limited cost, the size of the rotor assembly is inevitably reduced, which has a certain influence on the moment of inertia, and at this time, by limiting the inner and outer diameters of the stator core 1022, the thicknesses of the stator yoke 1023 and the permanent magnet 1044, and the number of the stator teeth 1024, the relationship among the number Q of the stator teeth 1024, the outer diameter D1 of the stator core 1022, the inner diameter D2 of the stator core 1022, the thickness Hj of the stator yoke 1023 of the stator core 1022, and the thickness h of the permanent magnet 1044 is:
Under the condition of the same outer diameter, the stator core 1022 with larger inner diameter can be selected, and the thickness of the stator yoke 1023 can be also selected to be thinner, so that the rotational inertia of the motor rotor and the low-frequency energy efficiency of the compressor can be improved under the condition of ensuring the demagnetizing rate of the magnet and the motor efficiency, and the product competitiveness of the motor structure 100 can be greatly improved.
It is understood that, regarding the upper and lower limits of the relationship between the inner and outer diameters of the stator core and the thickness of the stator yoke and the thickness of the permanent magnet, which are dimensional parameters, in the case where the unit of the outer diameter D1 of the stator core 1022, the inner diameter D2 of the stator core 1022, the thickness Hj of the stator yoke 1023 of the stator core 1022, and the thickness of the permanent magnet 1044 is millimeter, the unit of the upper and lower limits is also millimeter.
The axis of the stator core 1022 is collinear with the axis of the rotor core 1042, and the stator teeth 1024 and the permanent magnets 1044 are disposed around the axis and are generally uniformly disposed.
In some embodiments, the motor is an integer slot motor.
In other embodiments, fractional slot motors are used, where the motor operates on harmonics. Further, the cross-sectional shape of the permanent magnet 1044 belongs to a symmetrical pattern, so as to facilitate processing and installation, specifically, the permanent magnet 1044 includes any combination of three shapes, and may be a pure straight line segment, where the projection contour line of the permanent magnet 1044 should be perpendicular to the central axis under the condition of limiting symmetry. In another case, the permanent magnet 1044 may be a symmetrical straight line segment, or may be understood as a broken line segment, where the probability of projecting a contour line is high, including but not limited to V-shape, W-shape, etc. In yet another case, the permanent magnet 1044 is a pure curved segment, where a symmetrical shape is still required, and may be a single arc or a combination of multiple arcs.
Of course, a combination of curved and straight line segments may be used as long as the structure is symmetrical.
As shown in fig. 4, for the rotor core 1042, the rotor core 1042 is formed by axially laminating a plurality of rotor sheets 1048, and each rotor sheet 1048 is provided with a permanent magnet 1044 so as to move under the action of the vector magnetic field generated by the stator assembly 102, so as to realize the rotor action.
Further, the rotor punching sheet 1048 is made of a silicon steel sheet or other soft magnetic material sheet, and has a thickness not greater than 0.35mm.
Similarly, as shown in fig. 3, for the stator core 1022, the stator core 1022 is formed by axially stacking a plurality of stator laminations 1030, each stator lamination 1030 is provided with a stator yoke 1023, stator teeth 1024 and winding slots 1026, the stator teeth 1024 are disposed on the stator yoke 1023, and the winding slots 1026 are formed between two adjacent stator teeth 1024, so that the stator winding 1028 winds around the winding slots 1026, and a magnetic field can be generated on the rotor to realize a stator effect.
Further, the stator punching 1030 is made of a silicon steel sheet or other soft magnetic material sheet, and the thickness of the stator punching is not more than 0.35mm.
Example two
As shown in fig. 1 and 2, the motor structure 100 according to the present embodiment includes two parts, namely a stator assembly 102 and a rotor assembly 104, wherein, for the stator core 1022, a stator yoke 1023 and a stator tooth 1024 are respectively disposed on the radial outside and the radial inside, and a connection relationship exists between the stator yoke 1023 and the stator tooth 1024, so that when the stator tooth 1024 is wound to form the stator winding 1028 in the winding slot 1026, a normal magnetic field driving effect can be performed on the rotor assembly 104, and further, the rotation of the rotor assembly 104 is realized. Specifically, the rotor assembly 104 is coaxially disposed with the stator assembly 102 and mainly includes two parts including a rotor core 1042 and a permanent magnet 1044, for the rotor assembly 104, the size of the rotor assembly is related to the inner diameter of the stator core 1022, that is, the diameter of a circle surrounded by the inner edges of the tooth shoes of the stator teeth 1024, and in the case of limited cost, the size of the rotor assembly is inevitably reduced, which has a certain influence on the moment of inertia, and at this time, by limiting the inner and outer diameters of the stator core 1022, the thicknesses of the stator yoke 1023 and the permanent magnet 1044, and the number of the stator teeth 1024, the relationship among the number Q of the stator teeth 1024, the outer diameter D1 of the stator core 1022, the inner diameter D2 of the stator core 1022, the thickness Hj of the stator yoke 1023 of the stator core 1022, and the thickness h of the permanent magnet 1044 is:
Under the condition of the same outer diameter, the stator core 1022 with larger inner diameter can be selected, and the thickness of the stator yoke 1023 can be also selected to be thinner, so that the rotational inertia of the motor rotor and the low-frequency energy efficiency of the compressor can be improved under the condition of ensuring the demagnetizing rate of the magnet and the motor efficiency, and the product competitiveness of the motor structure 100 can be greatly improved.
It should be noted that the thickness of the stator yoke 1023 is a radial dimension defined in the cross section of the stator core or the rotor core, and the thickness of the permanent magnet 1044 is a thickness dimension defined in the cross section of the stator core or the rotor core, as shown in fig. 2, and in this embodiment, the thickness of the permanent magnet is a dimension denoted by h in the drawing. It will be appreciated that different shapes of permanent magnets may result in different thicknesses and even the thickness of the same permanent magnet may vary.
By limiting the number of stator teeth 1024 to less than 2 times the product of the pole pair number of the rotor and the motor phase number, i.e. the relationship between the number Q of stator teeth 1024 and the pole pair number p of permanent magnets 1044 and the phase number m of the motor structure 100 is:
The fractional slot motor is integrally formed, and under the action of the fractional slot motor, the higher harmonic potential generated by the non-sinusoidal distribution of the magnetic pole magnetic field can be effectively weakened, and meanwhile, the amplitude of the tooth harmonic potential can be weakened, and the waveform is improved. In addition, the motor with fractional slot can reduce the pulse amplitude value of magnetic flux effectively to reduce the pulse loss of magnetic pole surface.
Example III
As shown in fig. 1 and 2, the motor structure 100 according to the present embodiment includes two parts, namely a stator assembly 102 and a rotor assembly 104, wherein, for the stator core 1022, a stator yoke 1023 and a stator tooth 1024 are respectively disposed on the radial outside and the radial inside, and a connection relationship exists between the stator yoke 1023 and the stator tooth 1024, so that when the stator tooth 1024 is wound to form the stator winding 1028 in the winding slot 1026, a normal magnetic field driving effect can be performed on the rotor assembly 104, and further, the rotation of the rotor assembly 104 is realized. Specifically, the rotor assembly 104 is coaxially disposed with the stator assembly 102 and mainly includes two parts including a rotor core 1042 and a permanent magnet 1044, for the rotor assembly 104, the size of the rotor assembly is related to the inner diameter of the stator core 1022, that is, the diameter of a circle surrounded by the inner edges of the tooth shoes of the stator teeth 1024, and in the case of limited cost, the size of the rotor assembly is inevitably reduced, which has a certain influence on the moment of inertia, and at this time, by limiting the inner and outer diameters of the stator core 1022, the thicknesses of the stator yoke 1023 and the permanent magnet 1044, and the number of the stator teeth 1024, the relationship among the number Q of the stator teeth 1024, the outer diameter D1 of the stator core 1022, the inner diameter D2 of the stator core 1022, the thickness Hj of the stator yoke 1023 of the stator core 1022, and the thickness h of the permanent magnet 1044 is:
Under the condition of the same outer diameter, the stator core 1022 with larger inner diameter can be selected, and the thickness of the stator yoke 1023 can be also selected to be thinner, so that the rotational inertia of the motor rotor and the low-frequency energy efficiency of the compressor can be improved under the condition of ensuring the demagnetizing rate of the magnet and the motor efficiency, and the product competitiveness of the motor structure 100 can be greatly improved.
By limiting the number of stator teeth 1024 to be unequal to the number of permanent magnets 1044, a dislocated magnetic field may be created during operation to facilitate driving the rotor structure in a continuous rotation.
By limiting the number of stator teeth 1024 and permanent magnets 1044 to a lower limit, respectively, the number of stator teeth 1024 is not less than 9, and the number of permanent magnets 1044 is not less than 8, so as to achieve the fit of large slot poles of the motor, so that when the inner and outer diameters of the stator core 1022, the thicknesses of the stator yoke 1023 and the permanent magnets 1044, and the number of stator teeth 1024 are limited, the rotational inertia of the motor rotor and the low frequency energy efficiency of the compressor are improved under the condition that the magnet demagnetizing rate and the motor efficiency are ensured, thereby greatly improving the product competitiveness of the motor structure 100.
Still further, the number of stator teeth 1024 is no greater than 12.
Example IV
As shown in fig. 1 and 2, the motor structure 100 according to the present embodiment includes two parts, namely a stator assembly 102 and a rotor assembly 104, wherein, for the stator core 1022, a stator yoke 1023 and a stator tooth 1024 are respectively disposed on the radial outside and the radial inside, and a connection relationship exists between the stator yoke 1023 and the stator tooth 1024, so that when the stator tooth 1024 is wound to form the stator winding 1028 in the winding slot 1026, a normal magnetic field driving effect can be performed on the rotor assembly 104, and further, the rotation of the rotor assembly 104 is realized. Specifically, the rotor assembly 104 is coaxially disposed with the stator assembly 102 and mainly includes two parts including a rotor core 1042 and a permanent magnet 1044, for the rotor assembly 104, the size of the rotor assembly is related to the inner diameter of the stator core 1022, that is, the diameter of a circle surrounded by the inner edges of the tooth shoes of the stator teeth 1024, and in the case of limited cost, the size of the rotor assembly is inevitably reduced, which has a certain influence on the moment of inertia, and at this time, by limiting the inner and outer diameters of the stator core 1022, the thicknesses of the stator yoke 1023 and the permanent magnet 1044, and the number of the stator teeth 1024, the relationship among the number Q of the stator teeth 1024, the outer diameter D1 of the stator core 1022, the inner diameter D2 of the stator core 1022, the thickness Hj of the stator yoke 1023 of the stator core 1022, and the thickness h of the permanent magnet 1044 is:
Under the condition of the same outer diameter, the stator core 1022 with larger inner diameter can be selected, and the thickness of the stator yoke 1023 can be also selected to be thinner, so that the rotational inertia of the motor rotor and the low-frequency energy efficiency of the compressor can be improved under the condition of ensuring the demagnetizing rate of the magnet and the motor efficiency, and the product competitiveness of the motor structure 100 can be greatly improved.
In addition, a ratio between the inner diameter and the outer diameter of the stator core 1022 may be limited, and the ratio between the inner diameter of the stator core 1022 and the outer diameter of the stator core 1022 may be not less than 0.59. Therefore, the space of the rotor core 1042 surrounded by the stator core 1022 is larger, the pair is more convenient, the rotational inertia of the motor rotor and the low-frequency energy efficiency of the compressor are improved under the condition of ensuring the demagnetizing rate of the magnet and the motor efficiency, and the product competitiveness of the motor structure 100 is greatly improved.
Further, the upper limit of the ratio of the inner and outer diameters of the stator core 1022 is 0.6.
By size-limiting the outer diameter of the stator core 1022, the outer diameter of the stator core 1022 is not less than 80mm and not more than 110mm. The motor efficiency, demagnetizing rate, rotational inertia and low-frequency energy efficiency can be considered on the small-size motor, and the product competitiveness of the small-size motor is improved.
In a specific embodiment, there is provided an electric machine comprising: a stator; the stator comprises a stator core 1022 and a stator winding 1028, the stator core 1022 comprises stator convex teeth (namely stator teeth 1024), stator grooves (namely winding grooves 1026) and a stator yoke 1023, the stator convex teeth and the stator grooves are staggered and distributed on the stator core 1022 uniformly along the circumferential direction, and the stator winding 1028 is wound on the stator convex teeth uniformly according to rules; a rotor; the rotor comprises a rotor core 1042 and a magnet, the rotor core 1042 is provided with a magnet groove, and the magnet is arranged in the magnet groove; wherein the stator slot number Q, the stator outer diameter D1, the stator inner diameter D2, the thickness Hj of the stator yoke 1023, and the magnet section thickness h satisfy:
wherein: the units of D1, D2, hj and h are all millimeters.
Further, the outer diameter of the stator is more than or equal to 80 and less than or equal to 110 and D1;
further, the stator slot number Q satisfies: q is more than or equal to 9 and less than or equal to 12;
Further, the pole pair number p of the rotor is more than or equal to 2;
further, the stator slot number, the rotor pole number and the motor phase number satisfy: q/2mp <1;
Further, the windings (i.e., stator windings 1028) are comprised of enameled wires;
further, the stator core 1022 and the rotor core 1042 are each formed by laminating silicon steel sheets.
In another specific embodiment, the relationship among the outer diameter D1 of the stator core, the inner diameter D2 of the stator core, the thickness w of the permanent magnet, and the thickness h of the permanent magnet is also defined, specifically:
0.045≤(D2/D1)/(h×w)≤0.055。
The ratio between the inner diameter D2 and the outer diameter D1 of the stator core is determined firstly through limiting the ratio between the inner diameter and the outer diameter of the stator core and the approximate projection area of the permanent magnet on the cross section of the stator core, and then the product between the thickness and the width of the permanent magnet is determined, so that the magnet dosage can be reduced, the rotational inertia of the motor rotor can be improved, and the low-frequency energy efficiency of the compressor can be improved under the condition of ensuring the magnet demagnetizing rate and the motor efficiency by limiting the ratio between the inner diameter D2 and the outer diameter D1 of the stator core.
Further, D2/D1 is more than or equal to 0.59 and less than or equal to 0.60, and h multiplied by w is more than or equal to 10.73 and less than or equal to 13.3.
Further, the specific size of the permanent magnet is limited, and h is more than or equal to 1.3 and less than or equal to 1.6,6.7 and w is more than or equal to 10.2.
Example five
As shown in fig. 5, the compressor structure 200 according to the present embodiment includes a housing 202 and a motor structure 100 disposed in the housing 202, and the motor structure 100 in any of the foregoing embodiments is disposed in the housing 202, so that the beneficial effects of the motor structure 100 are not repeated herein.
Example six
As shown in fig. 6, the refrigeration device 300 according to the present embodiment includes a case 302 and a compressor structure 200 disposed in the case 302, and the compressor structure 200 according to the fifth embodiment is disposed in the refrigeration device 300, so that the beneficial effects of the compressor structure 200 are not described herein.
Among them, the refrigerating apparatus 300 includes, but is not limited to, apparatuses having a refrigerating function such as a refrigerator, a freezer, an air conditioner, and the like.
According to the motor structure, the compressor structure and the refrigeration equipment provided by the invention, under the condition that the demagnetizing rate of the magnet and the motor efficiency are ensured, the rotational inertia of the motor rotor and the low-frequency energy efficiency of the compressor are improved, so that the product competitiveness of the motor structure is greatly improved.
In the present invention, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; the term "plurality" means two or more, unless expressly defined otherwise. The terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; "coupled" may be directly coupled or indirectly coupled through intermediaries. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the description of the present invention, it should be understood that the directions or positional relationships indicated by the terms "upper", "lower", "left", "right", "front", "rear", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or units referred to must have a specific direction, be constructed and operated in a specific direction, and thus should not be construed as limiting the present invention.
In the description of the present specification, the terms "one embodiment," "some embodiments," "particular embodiments," and the like, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. An electric motor structure, comprising:
the stator assembly comprises a stator core, wherein the stator core specifically comprises a stator yoke and a plurality of stator teeth extending inwards from the stator yoke along the radial direction, the plurality of stator teeth are circumferentially distributed around the axis of the stator core, a winding groove is formed between two adjacent stator teeth, and a stator winding is arranged in the winding groove;
the rotor assembly is coaxially arranged with the stator assembly and comprises a rotor iron core and permanent magnets arranged on the rotor iron core;
the relationship among the number Q of the stator teeth, the outer diameter D1 of the stator core, the inner diameter D2 of the stator core, the thickness Hj of the stator yoke of the stator core and the thickness h of the permanent magnet is as follows:
2. the motor structure of claim 1, wherein the relationship between the number Q of stator teeth and the pole pair number p of the permanent magnets and the phase number m of the motor structure is:
3. the motor structure according to claim 1, characterized in that, on an end face of the rotor core, projection contour lines of the permanent magnets are symmetrical with respect to central axes of adjacent two of the stator teeth.
4. The motor structure according to claim 1, wherein a ratio between an inner diameter of the stator core and an outer diameter of the stator core is not less than 0.59.
5. The motor structure according to claim 4, wherein an outer diameter of the stator core is not less than 80mm and not more than 110mm.
6. The motor structure according to any one of claims 1 to 5, characterized in that the rotor core specifically includes:
the rotor punching sheets are stacked along the axial direction of the rotor core.
7. The motor structure according to any one of claims 1 to 5, characterized in that the stator core specifically includes:
The stator punching sheets are stacked along the axial direction of the stator core.
8. The motor structure according to any one of claims 1 to 5, characterized by further comprising: the relation among the outer diameter D1 of the stator core, the inner diameter D2 of the stator core, the thickness w of the permanent magnet and the thickness h of the permanent magnet is as follows:
0.045≤(D2/D1)/(h×w)≤0.055。
9. a compressor structure, comprising:
A housing;
the motor structure according to any one of claims 1 to 8, provided in the housing.
10. A refrigeration appliance, comprising:
A case;
the compressor structure of claim 9, disposed within said housing.
CN202111200157.5A 2021-10-14 2021-10-14 Motor structure, compressor structure and refrigeration equipment Active CN113872352B (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010110142A (en) * 2008-10-31 2010-05-13 Hitachi Industrial Equipment Systems Co Ltd Permanent magnet type rotary electric machine and compressor using the same
CN110768422A (en) * 2018-07-27 2020-02-07 广东美芝制冷设备有限公司 Permanent magnet motor and compressor with same
CN110875678A (en) * 2018-08-30 2020-03-10 广东美芝精密制造有限公司 Permanent magnet synchronous motor and compressor
CN216216113U (en) * 2021-10-14 2022-04-05 广东美芝制冷设备有限公司 Motor structure, compressor structure and refrigeration plant

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010110142A (en) * 2008-10-31 2010-05-13 Hitachi Industrial Equipment Systems Co Ltd Permanent magnet type rotary electric machine and compressor using the same
CN110768422A (en) * 2018-07-27 2020-02-07 广东美芝制冷设备有限公司 Permanent magnet motor and compressor with same
CN110875678A (en) * 2018-08-30 2020-03-10 广东美芝精密制造有限公司 Permanent magnet synchronous motor and compressor
CN216216113U (en) * 2021-10-14 2022-04-05 广东美芝制冷设备有限公司 Motor structure, compressor structure and refrigeration plant

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