CN107359761B - Single-phase induction motor and compressor - Google Patents

Single-phase induction motor and compressor Download PDF

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Publication number
CN107359761B
CN107359761B CN201710748774.6A CN201710748774A CN107359761B CN 107359761 B CN107359761 B CN 107359761B CN 201710748774 A CN201710748774 A CN 201710748774A CN 107359761 B CN107359761 B CN 107359761B
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stator
winding
pole
rotor
phase induction
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CN107359761A (en
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张德金
张尊睦
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
    • H02K17/00—Asynchronous induction motors; Asynchronous induction generators
    • H02K17/02—Asynchronous induction motors
    • H02K17/04—Asynchronous induction motors for single phase current
    • H02K17/08—Motors with auxiliary phase obtained by externally fed auxiliary windings, e.g. capacitor motors
    • 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
    • H02K1/16—Stator cores with slots for windings
    • H02K1/165—Shape, form or location of the slots
    • 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
    • H02K1/26—Rotor cores with slots for windings
    • H02K1/265—Shape, form or location of the slots
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K3/00—Details of windings
    • H02K3/04—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors
    • H02K3/28—Layout of windings or of connections between windings
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/64—Electric machine technologies in electromobility

Abstract

The invention provides a single-phase induction motor and a compressor, wherein the single-phase induction motor comprises: the motor stator comprises a stator core and a coil winding, wherein a plurality of stator grooves are formed in the inner wall of the stator core, the stator grooves are distributed along the circumferential direction and respectively conduct two end faces of the stator core, the coil winding comprises a main winding and an auxiliary winding, and the main winding and the auxiliary winding are respectively wound in the stator grooves; the motor rotor is sleeved in the motor stator, the motor rotor comprises a rotor core, a plurality of rotor grooves distributed along the circumferential direction are formed in the rotor core, the rotor grooves respectively conduct two end faces of the rotor core, the number of the stator grooves is 18, and the number of the rotor grooves is 27 or 29. By adopting the technical scheme, the invention can reduce the higher harmonic wave of the air gap flux density, and reduce the additional loss and the generation of redundant heat, thereby improving the operation efficiency of the single-phase induction motor, reducing the electromagnetic noise and being beneficial to the popularization and the application of the single-phase induction motor.

Description

Single-phase induction motor and compressor
Technical Field
The invention relates to the field of household appliances, in particular to a single-phase induction motor and a compressor.
Background
In the related technology, for a single-phase induction motor, the higher harmonic of the air gap flux density is one of important sources for comprehensively weakening the motor performance, the higher harmonic of the air gap flux density can generate skin effect in a stator winding and a rotor winding, so that extra additional copper loss is caused, high-frequency iron loss is induced in a stator iron core, stray loss is increased, the motor efficiency is reduced, the temperature rise is improved, electromagnetic noise is also induced, the wider application of the motor is limited, harmonic torque is added to the output torque due to the higher harmonic of the flux density, the increase of torque fluctuation is caused, the abrasion of mechanical parts is accelerated, and the service life of a motor product is shortened.
Disclosure of Invention
In order to solve at least one of the above problems, an object of the present invention is to provide a single-phase induction motor.
Another object of the present invention is to provide a compressor.
In order to achieve the above object, an embodiment of a first aspect of the present invention provides a single-phase induction motor, including: the motor stator comprises a stator core and a coil winding, wherein a plurality of stator grooves are formed in the inner wall of the stator core, the stator grooves are distributed along the circumferential direction and respectively conduct two end faces of the stator core, the coil winding comprises a main winding and an auxiliary winding, and the main winding and the auxiliary winding are respectively wound in the stator grooves; the motor rotor is sleeved in the motor stator, the motor rotor comprises a rotor core, a plurality of rotor grooves distributed along the circumferential direction are formed in the rotor core, the rotor grooves respectively conduct two end faces of the rotor core, the number of the stator grooves is 18, and the number of the rotor grooves is 27 or 29.
In the technical scheme, on the premise that the number of stator slots in the single-phase induction motor is 18, the number of correspondingly limited rotor slots is 27 or 29, namely, the single-phase induction motor is formed by assembling a motor stator with 18 stator slots and a motor rotor with 27 rotor slots, or the single-phase induction motor is formed by assembling a motor stator with 18 stator slots and a motor rotor with 29 rotor slots, compared with the single-phase induction motor with 26 rotor slots with 18 stator slots, the high-order harmonic wave of air gap flux density can be reduced, the skin effect generated in a stator winding and a rotor winding is further reduced, the additional loss and the generation of redundant heat are further reduced, and therefore, the operation efficiency of the single-phase induction motor is improved, the electromagnetic noise is reduced, and the popularization and the application of the single-phase induction motor are facilitated.
Specifically, because the air gap is arranged between the motor stator and the motor rotor, when the motor operates, a magnetic field is generated in the air gap, the strength of the magnetic field is the air gap flux density, and because the harmonic wave which is higher than the fundamental wave frequency and is generated by the air gap flux density is the higher harmonic wave, the higher harmonic wave can be eliminated or reduced in the motor operation process by limiting the reasonable number combination (such as 18 and 27 or 18 and 29) of the stator slots and the rotor slots, and the negative influence of the higher harmonic wave on the motor performance is further reduced.
The main winding can be called an office winding or an operation winding, the auxiliary winding can be called a starting working winding, and most single-phase induction motors are provided with the auxiliary winding in a form of thin wires, more turns and large resistance in order to increase the moment of the auxiliary winding.
In addition, the single-phase induction motor in the above embodiment provided by the invention may further have the following additional technical features:
in the above technical solution, preferably, the main winding and the auxiliary winding are two-pole windings, wherein each pole of the main winding is arranged in different stator slots by concentric winding, and each pole of the auxiliary winding is arranged in different stator slots by concentric winding.
In the technical scheme, the main winding and the auxiliary winding are both arranged to be two-pole windings, and each-pole winding is prepared in a concentric winding mode, on one hand, the two-pole windings are arranged to be two poles generated in the running process of the rotor, compared with the mode of arranging the four-pole windings, under the power frequency power supply condition, the rotating speed of the motor rotor is higher (the rated rotating speed is about 2900rpm for a single-phase induction motor), on the other hand, the coil windings are prepared in a concentric winding mode (namely, a plurality of rectangular coils with different sizes of the same coil group are embedded and arranged one by one in a same center position to form a shape like a Chinese character 'hui'), so that the structure of the sinusoidal winding is facilitated, and the generated higher harmonic wave is reduced.
In any of the above solutions, preferably, each pole of the main winding has three layers of coils wound concentrically; each pole of the auxiliary winding is provided with three layers of coils which are concentrically wound.
In the technical scheme, each pole main winding is set to be a three-layer concentric winding coil, each pole auxiliary winding is set to be a three-layer concentric winding coil, and in the concentric winding process from inside to outside, the number of turns of the coil is determined according to the number of slots of a stator, the winding coefficient and other factors (the number of slots of the stator can modulate the representation of harmonic waves generated by the coil in an air gap, the winding coefficient reflects the utilization rate of electromagnetic wires of the winding) and is in quasi-sinusoidal change, and due to the lower higher harmonic waves of the sinusoidal winding, the effects of reducing stray loss, improving the efficiency of a motor and inhibiting the temperature rise and the fluctuation of output torque of the motor are realized.
In any of the above technical solutions, preferably, two adjacent stator slots are configured as stator teeth, the stator core has a first symmetry axis and a second symmetry axis perpendicular to each other on the end surface, the plurality of stator slots are symmetrically arranged with respect to the first symmetry axis, and the plurality of stator teeth are symmetrically arranged with respect to the second symmetry axis.
In the technical scheme, the first symmetry axis and the second symmetry axis which are perpendicular to each other are respectively determined on the end face (or the cross section) of the stator core, so that a plurality of stator slots are symmetrically arranged relative to the first symmetry axis, a plurality of stator teeth are symmetrically arranged relative to the second symmetry axis, and the stator slots and the stator teeth are uniformly distributed along the circumferential direction, so that the symmetrical arrangement of the two-pole main coil and the symmetrical arrangement of the two-pole secondary coil can be realized, and the normal starting and running of the motor rotor are ensured.
The number of stator slots is 18, and the stator slots sequentially comprise S1, S2, S3, S4, S5, S6, S7, S8, S9, S10, S11, S12, S13, S14, S15, S16, S17 and S18, wherein the first symmetry can be arranged between the S1 and the S18, and the second symmetry axis coincides with the central axes of the S5 and the S14.
In any of the above technical solutions, preferably, two poles of the main winding are respectively disposed at two sides of the second symmetry axis; the two poles of the auxiliary winding are respectively arranged at two sides of the first symmetrical axis.
In the technical scheme, the two poles of the main winding are respectively arranged on the two sides of the second symmetry axis, and the two poles of the auxiliary winding are respectively arranged on the two sides of the first symmetry axis, so that on one hand, the three-layer winding is distributed and wound in different stator slots, and on the other hand, the even distribution of an induced magnetic field is facilitated, and therefore, the higher harmonic wave of the air gap flux density is reduced.
Specifically, the main winding and the auxiliary winding are inserted into the stator slot in a concentric embedded winding mode, the main winding can be divided into two poles by the second symmetry axis, and the auxiliary winding can be divided into two poles by the first symmetry axis.
At this time, the number of stator slots between the head and the tail of each layer of coil of the main winding is odd, and the number of stator slots between the head and the tail of each layer of coil of the auxiliary winding is even.
In any of the above technical solutions, preferably, two poles of the main winding are respectively disposed at two sides of the first symmetry axis; the two poles of the auxiliary winding are respectively arranged at two sides of the second symmetrical axis.
In the technical scheme, the two poles of the main winding are respectively arranged on the two sides of the first symmetrical axis, the two poles of the auxiliary winding are respectively arranged on the two sides of the second symmetrical axis, and compared with the arrangement mode that the two poles of the main winding are respectively arranged on the two sides of the second symmetrical axis and the two poles of the auxiliary winding are respectively arranged on the two sides of the first symmetrical axis, the arrangement positions of the main winding and the auxiliary winding can be interchanged, so that the flexibility of winding arrangement is improved.
At this time, the number of stator slots between the head and the tail of each layer of coil of the main winding is even, and the number of stator slots between the head and the tail of each layer of coil of the auxiliary winding is odd.
In any of the above technical solutions, preferably, the main winding includes a first pole main winding and a second pole main winding, and the auxiliary winding includes a first pole auxiliary winding and a second pole auxiliary winding, respectively, wherein an inner layer coil of the first pole main winding and an inner layer coil of the first pole auxiliary winding use the same stator slot, and an outer layer coil of the first pole auxiliary winding and an outer layer coil of the second pole auxiliary winding use the same stator slot.
In the technical scheme, the inner layer coil of the first pole main winding and the inner layer coil of the first pole auxiliary winding are wound in the same stator slot, and the outer layer coil of the first pole auxiliary winding and the outer layer coil of the second pole auxiliary winding are wound in the same stator slot, so that concentric winding between the main winding coil and the auxiliary winding coil is realized when the number of stator slots is 18, the energy efficiency is high, the noise is low, and the temperature rise is low.
The outer layer coil of the first pole main winding and the outer layer coil of the second pole main winding may be wound around the same stator slot.
Specifically, the outer layer coils of the first-pole main coil are respectively wound in the S1 and S9 stator slots, the middle layer coils of the first-pole main coil are respectively wound in the S2 and S8 stator slots, the inner layer coils of the first-pole main coil are respectively wound in the S3 and S7 stator slots, the inner layer coils of the first-pole auxiliary coil are respectively wound in the S3 and S16 stator slots, the middle layer coils of the first-pole auxiliary coil are respectively wound in the S4 and S15 stator slots, the outer layer coils of the first-pole auxiliary coil are respectively wound in the S5 and S14 stator slots, and the second pole and the first pole are symmetrically arranged.
In any of the above-mentioned aspects, preferably, the opening width of the stator groove on the inner wall is greater than or equal to 1.8mm and less than or equal to 2.5mm.
In the technical scheme, the smaller the opening width of the stator slot is, the lower the content of higher harmonics is, but the more difficult the coil inserting is, the coil pulling force is possibly caused to be too large to cause the wire damage, the safety coefficient of the motor is reduced, the larger the opening width of the stator slot is, the higher the content of higher harmonics is, the performance of the motor is reduced based on the two aspects, the opening width of the stator slot on the inner wall is set to be larger than or equal to 1.8mm and smaller than or equal to 2.5mm, on one hand, the higher harmonics are reduced, and on the other hand, the safety performance of the motor is improved.
As a preferred embodiment, the opening width of the stator slot is 2mm.
In any of the above embodiments, preferably, the cross section of the rotor groove is a closed groove contour, and the closed groove is filled with a conductive material, wherein the conductive material is embedded in the closed groove by die casting.
In the technical scheme, as the stator slot is an open slot, the stator slot or the opening of the rotor slot can increase the content of higher harmonics, namely tooth harmonics, in the air gap flux density, so that the motor performance is reduced, and the rotor slot is set to be a closed slot, thereby being beneficial to further inhibiting the higher harmonics in the air gap flux density.
In any of the above embodiments, preferably, the conductive material is a conductive aluminum member or a conductive copper member.
In the technical scheme, because the rotor groove is filled with the conductive material and is a closed groove, the conductive material in the rotor groove is formed by die casting and filling for simplifying the motor manufacturing process and facilitating production management, and the closed groove can ensure that the conductive material does not leak during die casting of the rotor, the motor efficiency can be greatly improved when the conductive material in the rotor groove adopts copper due to lower resistivity of copper, but the cost is higher, and the motor cost can be greatly reduced when the conductive material in the rotor groove adopts aluminum, but the efficiency is lower.
When the single-phase induction motor is applied to different fields, the conductive material can be selected as a conductive aluminum piece or a conductive copper piece correspondingly.
An embodiment of the second aspect of the present invention provides a compressor, including a single-phase induction motor according to any one of the embodiments of the first aspect of the present invention.
In this technical solution, the compressor includes any one of the single-phase induction motors according to the first aspect of the present invention, so as to have the technical effects of any one of the single-phase induction motors described above, which are not described herein again.
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
The foregoing and/or additional aspects and advantages of the invention will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:
fig. 1 shows a schematic structure of a single-phase induction motor according to an embodiment of the present invention;
fig. 2 shows a schematic structural view of a single-phase induction motor according to another embodiment of the present invention;
FIG. 3 illustrates a stator winding coil pattern in accordance with the present invention;
FIG. 4 shows a comparison of the 7 th harmonic of a single phase induction motor having an embodiment of the present invention with a single phase induction motor of the related art;
fig. 5 shows a comparison of the 9 th harmonic of a single-phase induction motor having an embodiment of the present invention and a single-phase induction motor of the related art;
fig. 6 shows a comparison of the 11 th harmonic of a single-phase induction motor having an embodiment of the present invention and a single-phase induction motor of the related art.
The correspondence between the reference numerals and the component names in fig. 1 and 3 is:
10 motor stator, 102 stator core, 104 stator slots, 106 main winding, 108 auxiliary winding, 20 motor rotor, 202 rotor core, 204 rotor slots.
Detailed Description
In order that the above-recited objects, features and advantages of the present invention will be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description. It should be noted that, in the case of no conflict, the embodiments of the present application and the 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 invention, however, the present invention may be practiced in other ways than those described herein, and therefore the scope of the present invention is not limited to the specific embodiments disclosed below.
A single-phase induction motor according to some embodiments of the present invention is described below with reference to fig. 1 to 3.
As shown in fig. 1 and 2, a single-phase induction motor according to an embodiment of the present invention includes: the motor stator 10 comprises a stator core 102 and a coil winding, wherein a plurality of stator slots 104 are formed in the inner wall of the stator core 102, the plurality of stator slots 104 are distributed along the circumferential direction, two end faces of the stator core 102 are respectively conducted, the coil winding comprises a main winding 106 and an auxiliary winding 108, and the main winding 106 and the auxiliary winding 108 are respectively wound in the plurality of stator slots 104; the motor rotor 20 is sleeved in the motor stator 10, the motor rotor 20 comprises a rotor core 202, the rotor core 202 is provided with a plurality of rotor grooves 204 distributed along the circumferential direction, and the rotor grooves 204 respectively conduct two end faces of the rotor core 202.
Embodiment one:
as shown in fig. 1, the number of stator slots 104 is 18, and the number of rotor slots 204 is 27.
Embodiment two:
as shown in fig. 2, the number of stator slots 104 is 18, and the number of rotor slots 204 is 29.
In this embodiment, on the premise that the number of stator slots 104 in the single-phase induction motor is 18, the number of correspondingly defined rotor slots 204 is 27 or 29, that is, the single-phase induction motor is formed by assembling the motor stator 10 with 18 stator slots 104 and the motor rotor 20 with 27 rotor slots 204, or the single-phase induction motor is formed by assembling the motor stator 10 with 18 stator slots 104 and the motor rotor 20 with 29 rotor slots 204, compared with the single-phase induction motor with 18 stator slots 104 and 26 rotor slots 204, the higher harmonic wave of the air gap flux density can be reduced, the skin effect generated in the stator winding and the rotor winding can be further reduced, and the additional loss and the generation of redundant heat can be further reduced, so that the operation efficiency of the single-phase induction motor is improved, the electromagnetic noise is reduced, and the popularization and the application of the single-phase induction motor are facilitated.
Specifically, since the air gap is formed between the motor stator 10 and the motor rotor 20, when the motor is running, a magnetic field is generated in the air gap, and the strength of the magnetic field is the air gap flux density, and since the harmonic wave higher than the fundamental wave frequency generated by the air gap flux density is the higher harmonic wave, by limiting the reasonable number combination (such as 18 and 27 or 18 and 29) of the stator slots 104 and the rotor slots 204, the higher harmonic wave can be eliminated or reduced during the motor running, and further the negative influence of the higher harmonic wave on the motor performance can be reduced.
The main winding 106 may be referred to as an office winding or an operation winding, the auxiliary winding 108 may be referred to as a start-up winding, and most single-phase induction motors are provided with the auxiliary winding 108 in a form of thin wires, a large number of turns and a large resistance in order to increase the torque of the auxiliary winding 108.
In addition, the single-phase induction motor in the above embodiment provided by the invention may further have the following additional technical features:
embodiment III:
as shown in fig. 1 and 2, in the above embodiment, the main winding 106 and the auxiliary winding 108 are preferably two-pole windings, wherein each pole of the main winding 106 is disposed in a different stator slot 104 by concentric winding, and each pole of the auxiliary winding 108 is disposed in a different stator slot 104 by concentric winding.
In this embodiment, by setting both the main winding 106 and the auxiliary winding 108 as two pole windings, and each pole winding is prepared by concentric winding, on one hand, by setting the two pole windings, that is, the rotor generates two poles during operation, the rotation speed of the motor rotor 20 is higher (rated rotation speed is about 2900rpm for a single-phase induction motor) under the power frequency power supply condition than the mode of setting the four pole windings, on the other hand, by preparing the coil windings (that is, several rectangular coils of the same coil group and different in size are embedded and arranged in a shape like a Chinese character 'hui' one by one at the same center position) by adopting the concentric winding, the construction of the sinusoidal windings is facilitated, and the generated higher harmonics are further reduced.
Embodiment four:
as shown in fig. 1 to 3, in any of the above embodiments, preferably, each pole of the main winding 106 has three layers of coils concentrically wound; each pole secondary winding 108 has three layers of concentric windings.
In this embodiment, by setting each pole of the main winding 106 as three layers of coils wound concentrically, setting each pole of the auxiliary winding 108 as three layers of coils wound concentrically, and in the concentric winding process from inside to outside, the number of turns of the coils varies in a quasi-sinusoidal manner according to the number of slots of the stator and factors such as winding coefficients (the number of slots of the stator can modulate the appearance of harmonics generated by the coils in an air gap, the winding coefficients reflect the utilization rate of electromagnetic wires of the windings), so that the main winding 106 and the auxiliary winding 108 can be regarded as sinusoidal windings, and the effects of reducing stray loss, improving motor efficiency, and suppressing the temperature rise and fluctuation of output torque of the motor are realized due to the lower higher harmonics of the sinusoidal windings.
Fifth embodiment:
as shown in fig. 1 and 2, in any of the above embodiments, it is preferable that two adjacent stator slots 104 are configured as stator teeth, the stator core 102 has a first symmetry axis S01 and a second symmetry axis S02 perpendicular to each other on the end surface, the plurality of stator slots 104 are symmetrically disposed with respect to the first symmetry axis S01, and the plurality of stator teeth are symmetrically disposed with respect to the second symmetry axis S02.
In this embodiment, the first symmetry axis S01 and the second symmetry axis S02 perpendicular to each other are respectively determined on the end face (or the cross section) of the stator core 102, so that the plurality of stator slots 104 are symmetrically disposed with respect to the first symmetry axis S01, the plurality of stator teeth are symmetrically disposed with respect to the second symmetry axis S02, and the stator slots 104 and the stator teeth are uniformly disposed along the circumferential direction, so that the symmetrical arrangement of the two-pole main coil and the symmetrical arrangement of the two-pole sub-coil can be realized, thereby ensuring the normal starting and running of the motor rotor 20.
The number of the stator slots 104 is 18, and the stator slots sequentially include S1, S2, S3, S4, S5, S6, S7, S8, S9, S10, S11, S12, S13, S14, S15, S16, S17, and S18, where the first symmetry may be disposed between S1 and S18, and the second symmetry axis S02 coincides with the central axes of S5 and S14.
Example six:
in any of the above embodiments, preferably, two poles of the main winding 106 are disposed on both sides of the second symmetry axis S02, respectively; the two poles of the secondary winding 108 are respectively disposed on both sides of the first symmetry axis S01.
In this embodiment, by disposing the two poles of the main winding 106 on both sides of the second symmetry axis S02, and disposing the two poles of the auxiliary winding 108 on both sides of the first symmetry axis S01, on one hand, the distributed winding of the three-layer winding in the different stator slots 104 is realized, and on the other hand, the uniform distribution of the induced magnetic field is facilitated, so that the higher harmonics of the air gap flux density are reduced.
Specifically, the main winding 106 and the auxiliary winding 108 are inserted into the stator slot 104 in a concentric embedding manner, the main winding 106 may be divided into two poles by the second symmetry axis S02, and the auxiliary winding 108 may be divided into two poles by the first symmetry axis S01.
At this time, the number of stator slots 104 between the head and the tail of each layer of coil of the main winding 106 is odd, and the number of stator slots 104 between the head and the tail of each layer of coil of the auxiliary winding 108 is even.
Embodiment seven:
in any of the above embodiments, preferably, two poles of the main winding 106 are respectively disposed on both sides of the first symmetry axis S01; the two poles of the secondary winding 108 are respectively disposed on both sides of the second symmetry axis S02.
In this embodiment, by arranging the two poles of the main winding 106 on the two sides of the first symmetry axis S01, and arranging the two poles of the auxiliary winding 108 on the two sides of the second symmetry axis S02, the arrangement positions between the main winding 106 and the auxiliary winding 108 can be interchanged, and the flexibility of winding arrangement can be improved, compared to the arrangement in which the two poles of the main winding 106 are arranged on the two sides of the second symmetry axis S02, and the two poles of the auxiliary winding 108 are arranged on the two sides of the first symmetry axis S01.
At this time, the number of stator slots 104 between the head and the tail of each layer of coil of the main winding 106 is even, and the number of stator slots 104 between the head and the tail of each layer of coil of the auxiliary winding 108 is odd.
Example eight:
as shown in fig. 1 to 3, in any of the above embodiments, preferably, the main winding 106 includes a first pole main winding 106 and a second pole main winding 106, and the auxiliary winding 108 includes a first pole auxiliary winding 108 and a second pole auxiliary winding 108, respectively, wherein the inner layer coil of the first pole main winding 106 and the inner layer coil of the first pole auxiliary winding 108 use the same stator slot 104, and the outer layer coil of the first pole auxiliary winding 108 and the outer layer coil of the second pole auxiliary winding 108 use the same stator slot 104.
In this embodiment, by winding the inner layer coil of the first pole main winding 106 and the inner layer coil of the first pole sub-winding in the same stator slot 104, and winding the outer layer coil of the first pole sub-winding 108 and the outer layer coil of the second pole sub-winding 108 in the same stator slot 104, concentric winding between the coils of the main winding 106 and the sub-winding 108 is achieved when the number of the stator slots 104 is 18, and the energy efficiency is high, the noise is small, and the temperature rise is low.
The outer layer coil of the first pole main winding 106 and the outer layer coil of the second pole main winding 106 may be wound around the same stator slot 104.
As shown in fig. 1 to 3, specifically, the outer layer coils of the first-pole main coil are respectively wound in the S1 and S9 stator slots 104, the middle layer coils of the first-pole main coil are respectively wound in the S2 and S8 stator slots 104, the inner layer coils of the first-pole main coil are respectively wound in the S3 and S7 stator slots 104, the inner layer coils of the first-pole sub-coil are respectively wound in the S3 and S16 stator slots 104, the middle layer coils of the first-pole sub-coil are respectively wound in the S4 and S15 stator slots 104, the outer layer coils of the first-pole sub-coil are respectively wound in the S5 and S14 stator slots 104, and the second pole and the first pole pair are respectively arranged.
In any of the above embodiments, the opening width of the stator groove 104 on the inner wall is preferably greater than or equal to 1.8mm and less than or equal to 2.5mm.
In this embodiment, since the smaller the opening width of the stator slot 104 is, the lower the content of higher harmonics is, but the more difficult the coil insertion is, the wire damage may be caused by the excessive coil tension, and the safety factor of the motor is reduced, while the larger the opening width of the stator slot 104 is, the higher the content of higher harmonics is, and the reduction of the motor performance is based on the above two aspects, the opening width of the stator slot 104 on the inner wall is set to be greater than or equal to 1.8mm and less than or equal to 2.5mm, which is advantageous for reducing the higher harmonics on one hand and improving the safety performance of the motor on the other hand.
As a preferred embodiment, the opening width of the stator slot 104 is 2mm.
In any of the above embodiments, the cross section of the rotor groove 204 is preferably a closed groove profile, and the closed groove is filled with a conductive material, wherein the conductive material is embedded in the closed groove by die casting.
In this embodiment, since the stator slot 104 is an open slot, the opening of the stator slot 104 or the rotor slot 204 increases the content of higher harmonics, i.e., tooth harmonics, in the air gap flux density, resulting in a reduction in motor performance, which is facilitated by providing the rotor slot 204 as a closed slot.
In any of the above embodiments, preferably, the conductive material is a conductive aluminum member or a conductive copper member.
In this embodiment, since the rotor groove 204 is filled with the conductive material and the rotor groove 204 is a closed groove, the conductive material in the rotor groove 204 is formed by die casting and filling for simplification of the motor manufacturing process and convenience of production management, and the closed groove can make the conductive material of the rotor leak-free at the time of die casting, the motor efficiency can be greatly improved when the conductive material in the rotor groove 204 adopts copper due to the lower resistivity of copper, but the cost is high, and the motor cost can be greatly reduced when the conductive material in the rotor groove 204 adopts aluminum, but the efficiency is low.
When the single-phase induction motor is applied to different fields, the conductive material can be selected as a conductive aluminum piece or a conductive copper piece correspondingly.
As shown in fig. 4 to 6, the higher harmonics in the air gap flux density are the seventh harmonic, the ninth harmonic and the 11 th harmonic, respectively, and by adopting a combination scheme that the number of stator slots 104 is 18, the number of rotor slots 204 is 27, or the number of stator slots 104 is 18, and the number of rotor slots 204 is 29, compared with a scheme that the number of stator slots 104 is 18 and the number of rotor slots 204 is 26, the harmonics can be greatly reduced, and further the motor stray loss can be further reduced, the motor efficiency can be improved, the motor temperature rise can be suppressed, the fluctuation of output torque can be weakened, and the like.
A compressor according to an embodiment of the present invention includes the single-phase induction motor set forth in any of the above embodiments.
In this embodiment, the compressor includes the single-phase induction motor set forth in any one of the above embodiments, so as to have the technical effects of the single-phase induction motor set forth in any one of the above embodiments, which will not be described herein.
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 (9)

1. A single-phase induction motor, comprising:
the motor stator comprises a stator core and a coil winding, wherein a plurality of stator grooves are formed in the inner wall of the stator core, the stator grooves are distributed along the circumferential direction and respectively conduct two end faces of the stator core, the coil winding comprises a main winding and an auxiliary winding, and the main winding and the auxiliary winding are respectively wound in the stator grooves;
the motor rotor is sleeved in the motor stator and comprises a rotor core, the rotor core is provided with a plurality of rotor grooves distributed along the circumferential direction, the rotor grooves respectively lead the two end surfaces of the rotor core to be conducted,
wherein the number of the stator slots is 18, and the number of the rotor slots is 27 or 29;
the main winding and the auxiliary winding are both two-pole windings;
the main winding comprises a first pole main winding and a second pole main winding respectively, the auxiliary winding comprises a first pole auxiliary winding and a second pole auxiliary winding respectively,
the inner layer coil of the first pole main winding and the inner layer coil of the first pole auxiliary winding use the same stator slot, and the outer layer coil of the first pole auxiliary winding and the outer layer coil of the second pole auxiliary winding use the same stator slot;
each pole of the main winding is arranged in different stator slots through concentric winding, and each pole of the auxiliary winding is arranged in different stator slots through concentric winding.
2. The single-phase induction motor according to claim 1, wherein,
each pole of the main winding is provided with three layers of first coils which are concentrically wound;
the secondary winding has three layers of second coils concentrically wound.
3. The single-phase induction motor according to claim 2, wherein,
stator teeth are formed between two adjacent stator slots, the stator core is provided with a first symmetrical axis and a second symmetrical axis which are perpendicular to each other on the end face, a plurality of stator slots are symmetrically arranged relative to the first symmetrical axis, and a plurality of stator teeth are symmetrically arranged relative to the second symmetrical axis.
4. A single phase induction motor according to claim 3, wherein,
the two poles of the main winding are respectively arranged at two sides of the second symmetrical axis;
the two poles of the auxiliary winding are respectively arranged at two sides of the first symmetrical axis.
5. A single phase induction motor according to claim 3, wherein,
the two poles of the main winding are respectively arranged at two sides of the first symmetrical axis;
the two poles of the auxiliary winding are respectively arranged at two sides of the second symmetry axis.
6. The single-phase induction motor according to any one of claims 1 to 5, characterized in that,
the opening width of the stator groove on the inner wall is larger than or equal to 1.8mm and smaller than or equal to 2.5mm.
7. The single-phase induction motor of claim 1, further comprising:
the cross section of the rotor groove is a closed groove outline, and the closed groove is filled with conductive materials, wherein the conductive materials are embedded into the closed groove in a die casting mode.
8. The single-phase induction motor according to claim 7, wherein,
the conductive material is a conductive aluminum piece or a conductive copper piece.
9. A compressor comprising a single-phase induction motor according to any one of claims 1 to 8.
CN201710748774.6A 2017-08-28 2017-08-28 Single-phase induction motor and compressor Active CN107359761B (en)

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