CN110875649A - Stator module, motor, compressor and refrigeration equipment - Google Patents
Stator module, motor, compressor and refrigeration equipment Download PDFInfo
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- CN110875649A CN110875649A CN201811015712.5A CN201811015712A CN110875649A CN 110875649 A CN110875649 A CN 110875649A CN 201811015712 A CN201811015712 A CN 201811015712A CN 110875649 A CN110875649 A CN 110875649A
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- 238000005057 refrigeration Methods 0.000 title claims abstract description 11
- 238000004804 winding Methods 0.000 claims abstract description 464
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 abstract description 29
- 229910052802 copper Inorganic materials 0.000 abstract description 16
- 239000010949 copper Substances 0.000 abstract description 16
- 238000004519 manufacturing process Methods 0.000 abstract description 11
- 230000009467 reduction Effects 0.000 description 4
- 230000006872 improvement Effects 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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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
- H02K1/16—Stator cores with slots for windings
- H02K1/165—Shape, form or location of the slots
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- 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
- H02K3/12—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors arranged in slots
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- 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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- Windings For Motors And Generators (AREA)
Abstract
The invention discloses a stator assembly, a motor, a compressor and refrigeration equipment, wherein the stator assembly comprises: the stator core is provided with a stator hole which is axially communicated, a plurality of stator teeth are arranged at intervals along the circumferential direction of the stator hole, and a winding slot is defined between any two adjacent stator teeth; stator winding, stator winding include main winding and secondary winding, and main winding and secondary winding pass the winding wire groove around locating on the stator tooth, and the cross section of at least one winding wire groove that only is equipped with secondary winding is S1, and the cross-sectional area of at least one winding wire groove that is equipped with main winding and secondary winding simultaneously is S2, and satisfies: 0.5-0.77 of S1/S2. According to the stator assembly disclosed by the invention, the harmonic content of the secondary winding can be reduced, so that the stray loss of the motor is reduced, and the cost performance of the motor is improved. In addition, the groove filling rate can be controlled at a reasonable level, the winding wire is prevented from being separated from the winding groove, the manufacturing type is good, and the reliability is good. In addition, the high utilization rate of copper wires can be ensured.
Description
Technical Field
The invention relates to the technical field of motors, in particular to a stator assembly, a motor, a compressor and refrigeration equipment.
Background
In the related art, the single-phase induction motor has a simple structure and high energy efficiency, and is widely applied to the field of household appliances such as air conditioners. The motor efficiency improvement scheme is generally to increase the groove area of wire casing to hold more copper lines and improve motor efficiency. The motor is usually designed as a six-edge, equal slot, or four-edge, large and small slot design. However, the slot area with the largest span of the secondary winding in the motor is too large, the slot with the smallest span and the main winding share the slot, the number of turns of the secondary winding is small, so that the harmonic content of the motor is high, the using amount of copper wires is increased, the stray loss is increased, and the motor efficiency is low.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides a stator assembly, and the harmonic content of the secondary winding of the stator assembly is low.
The invention further provides a motor which comprises the stator assembly.
The invention also provides a compressor, which comprises the motor.
The invention also provides refrigeration equipment which comprises the compressor.
A stator assembly according to an embodiment of the present invention includes: the stator core is provided with a stator hole which is axially communicated, a plurality of stator teeth are arranged at intervals along the circumferential direction of the stator hole, and a winding slot is defined between any two adjacent stator teeth; the stator winding comprises a main winding and an auxiliary winding, the main winding and the auxiliary winding pass through the winding slots and are wound on the stator teeth, the cross section of at least one winding slot only provided with the auxiliary winding is S1, and the cross section area of at least one winding slot provided with both the main winding and the auxiliary winding is S2, and the requirements are that: 0.5-0.77 of S1/S2.
According to the stator assembly of the embodiment of the invention, the cross section of at least one winding groove only provided with the secondary winding is S1, the cross section of at least one winding groove provided with the primary winding and the secondary winding is S2, and the following conditions are met: S1/S2 is not less than 0.5 and not more than 0.77, the number of turns of the secondary winding in the winding slot with the area of S1 and only provided with the secondary winding can be reduced, the number of turns of the secondary winding in the winding slot with the area of S2 and provided with the main winding and the secondary winding simultaneously is improved, and the difference of the number of turns of the secondary winding in each winding slot is reduced, so that the harmonic content of the secondary winding is reduced, the stray loss of the motor is reduced, and the cost performance of the motor is improved. In addition, the groove filling rate can be controlled at a reasonable level, the winding wire is prevented from being separated from the winding groove, the manufacturing type is good, and the reliability is good. In addition, the high utilization rate of copper wires can be ensured.
According to some embodiments of the present invention, in a circumferential direction of the stator core, only the secondary winding is disposed in two of the winding slots in which the secondary winding having the largest span is located, and a cross-sectional area of at least one of the two winding slots in which the secondary winding having the largest span is located is S1, and the secondary winding having the smallest span is disposed in the same winding slot together with the main winding.
In some embodiments of the present invention, a cross-section of at least one of the two winding slots in which the secondary winding having the smallest span is located is S2.
In some embodiments of the present invention, the number of the winding slots having an area of S1 where only the secondary winding is provided is 2N, where N satisfies: n is more than or equal to 2.
According to some embodiments of the present invention, a plurality of the winding slots provided with the secondary winding and the primary winding at the same time have the same cross-sectional area.
According to some embodiments of the present invention, the cross-sectional area of at least one winding slot between two winding slots where the secondary winding with the largest span is located and the corresponding two winding slots where the secondary winding with the smallest span is located is S3, and satisfies: s1 is not less than S3 is not less than S2.
According to some embodiments of the invention, the number of coil layers of the secondary winding per pole is three or four.
The motor comprises a rotor and the stator assembly, wherein the rotor is arranged in the stator hole, and the rotor can rotate relative to the stator.
According to the motor of the embodiment of the invention, the cross section of at least one winding slot only provided with the secondary winding is S1, the cross section of at least one winding slot provided with the primary winding and the secondary winding is S2, and the following conditions are met: S1/S2 is not less than 0.5 and not more than 0.77, the number of turns of the secondary winding in the winding slot with the area of S1 and only provided with the secondary winding can be reduced, the number of turns of the secondary winding in the winding slot with the area of S2 and provided with the main winding and the secondary winding simultaneously is improved, and the difference of the number of turns of the secondary winding in each winding slot is reduced, so that the harmonic content of the secondary winding is reduced, the stray loss of the motor is reduced, and the cost performance of the motor is improved. In addition, the groove filling rate can be controlled at a reasonable level, the winding wire is prevented from being separated from the winding groove, the manufacturing type is good, and the reliability is good. In addition, the high utilization rate of copper wires can be ensured.
The compressor comprises the motor.
According to the compressor of the embodiment of the invention, the cross section of at least one winding slot only provided with the secondary winding is S1, the cross section of at least one winding slot provided with the primary winding and the secondary winding is S2, and the following conditions are met: S1/S2 is not less than 0.5 and not more than 0.77, the number of turns of the secondary winding in the winding slot with the area of S1 and only provided with the secondary winding can be reduced, the number of turns of the secondary winding in the winding slot with the area of S2 and provided with the main winding and the secondary winding simultaneously is improved, and the difference of the number of turns of the secondary winding in each winding slot is reduced, so that the harmonic content of the secondary winding is reduced, the stray loss of the motor is reduced, and the cost performance of the motor is improved. In addition, the groove filling rate can be controlled at a reasonable level, the winding wire is prevented from being separated from the winding groove, the manufacturing type is good, and the reliability is good. In addition, the high utilization rate of copper wires can be ensured.
The refrigeration equipment comprises the compressor.
According to the refrigeration equipment provided by the embodiment of the invention, the cross section of at least one winding slot only provided with the secondary winding is S1, the cross section of at least one winding slot provided with the primary winding and the secondary winding is S2, and the following conditions are met: S1/S2 is not less than 0.5 and not more than 0.77, the number of turns of the secondary winding in the winding slot with the area of S1 and only provided with the secondary winding can be reduced, the number of turns of the secondary winding in the winding slot with the area of S2 and provided with the main winding and the secondary winding simultaneously is improved, and the difference of the number of turns of the secondary winding in each winding slot is reduced, so that the harmonic content of the secondary winding is reduced, the stray loss of the motor is reduced, and the cost performance of the motor is improved. In addition, the groove filling rate can be controlled at a reasonable level, the winding wire is prevented from being separated from the winding groove, the manufacturing type is good, and the reliability is good. In addition, the high utilization rate of copper wires can be ensured.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic structural view of a stator assembly according to an embodiment of the present invention;
FIG. 2 is a schematic structural view of a stator assembly according to another embodiment of the present invention;
FIG. 3 is a schematic winding diagram of a stator winding according to an embodiment of the present invention;
FIG. 4 is a plot of the magnitude of S1/S2 of a stator assembly versus the third harmonic content of the secondary windings of the stator assembly in accordance with an embodiment of the present invention;
FIG. 5 is a graph of the value of S1/S2 of a stator assembly versus motor efficiency according to an embodiment of the present invention;
fig. 6 is a graph of the value of S1/S2 of a stator assembly versus the amount of machine copper wire used in accordance with an embodiment of the present invention.
Reference numerals:
the stator assembly 100 is provided with,
a stator core 1, a stator hole 11, stator teeth 12, a winding slot 13,
stator winding 2, main winding 21, secondary winding 22.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In the description of the present invention, it is to be understood that the terms "central," "inner," "outer," "axial," "radial," "circumferential," and the like are used in the positional or orientational relationships shown in the drawings to facilitate the description of the invention and to simplify the description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus are not to be construed as limiting the invention. Furthermore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
A stator assembly 100 according to an embodiment of the present invention is described below with reference to fig. 1-3.
As shown in fig. 1 to 3, a stator assembly 100 according to an embodiment of the present invention includes a stator core 1 and a stator winding 2.
Specifically, as shown in fig. 1 and 2, the stator core 1 has a stator hole 11 penetrating axially, a plurality of stator teeth 12 are provided at intervals in a circumferential direction of the stator hole 11, and a winding slot 13 is defined between any two adjacent stator teeth 12. As shown in fig. 3, the stator winding 2 includes a main winding 21 and a sub-winding 22, and the main winding 21 and the sub-winding 22 are wound around the stator teeth 12 through the winding slots 13.
Wherein, the cross section of at least one winding slot 13 only provided with the secondary winding 22 is S1, the cross section of at least one winding slot 13 provided with the primary winding 21 and the secondary winding 22 is S2, and the following requirements are met: 0.5-0.77 of S1/S2. Therefore, the number of turns of the secondary winding 22 in the winding slot 13 with the area of S1 and only provided with the secondary winding 22 can be reduced, the number of turns of the secondary winding 22 in the winding slot 13 with the area of S2 and provided with the primary winding 21 and the secondary winding 22 at the same time is increased, the difference of the number of turns of the secondary winding 22 in each winding slot 13 is reduced, the harmonic content of the secondary winding 22 is reduced, the stray loss of the motor is reduced, and the cost performance of the motor is improved. In addition, the groove filling rate can be controlled at a reasonable level, the winding wire is prevented from being separated from the winding groove 13, the manufacturing type is good, and the reliability is good. In addition, higher copper wire utilization rate can be ensured.
According to the stator assembly 100 of the embodiment of the present invention, by making the cross-sectional area of at least one of the winding slots 13 provided with only the secondary winding 22S 1, the cross-sectional area of at least one of the winding slots 13 provided with both the primary winding 21 and the secondary winding 22 is S2, and satisfying: S1/S2 is not less than 0.5 and not more than 0.77, the number of turns of the secondary winding 22 in the winding slot 13 with the area of S1 and only provided with the secondary winding 22 can be reduced, the number of turns of the secondary winding 22 in the winding slot 13 with the area of S2 and provided with the primary winding 21 and the secondary winding 22 simultaneously is improved, and the difference of the number of turns of the secondary winding 22 in each winding slot 13 is reduced, so that the harmonic content of the secondary winding 22 is reduced, the stray loss of the motor is reduced, and the cost performance of the motor is improved. In addition, the groove filling rate can be controlled at a reasonable level, the winding wire is prevented from being separated from the winding groove 13, the manufacturing type is good, and the reliability is good. In addition, the high utilization rate of copper wires can be ensured.
In some embodiments of the present invention, only the secondary winding 22 is provided in the two winding slots 13 in which the secondary winding 22 having the largest span is located, and at least one of the two winding slots 13 in which the secondary winding 22 having the largest span has a cross-sectional area of S1, in the circumferential direction of the stator core 1, the secondary winding 22 having the smallest span is provided in the same winding slot 13 together with the main winding 21. Therefore, the number of turns of the coil in the winding slot 13 where the secondary winding 22 with the largest span is located can be reduced, the difference of the number of turns of the coil of the secondary winding 22 in each winding slot 13 is reduced, and the harmonic content is reduced, so that the stray loss of the motor is reduced, and the cost performance of the motor is improved.
It should be noted that, as shown in fig. 3, each of the secondary windings 22 may include a plurality of layers of coils, and each of the layers of coils is disposed in the corresponding two winding slots 13. The secondary winding 22 with the smallest span can be understood as the layer of the secondary winding 22 with the smallest number of the stator teeth 12 between the two winding slots 13 corresponding to each layer of the secondary winding 22. As shown in fig. 3, each pole secondary winding 22 includes three layers of coils: n1 layers, n2 layers and n3 layers. Wherein, two winding slots 13 corresponding to the coils of the outermost n1 layers of secondary windings 22: the number of stator teeth 12 between the winding slots 13 numbered 19 and 6 (or the winding slots 13 numbered 7 and 18) is 11. The intermediate layer n2 includes two winding slots 13 corresponding to the secondary winding 22: the number of stator teeth 12 between the winding slots 13 numbered 20 and 5 (or the winding slots 13 numbered 8 and 17) is 9. Two winding slots 13 corresponding to the innermost n3 layers of secondary windings 22: the number of stator teeth 12 between the winding slots 13 numbered 21 and 4 (or the winding slots 13 numbered 9 and 16) is 7.
The secondary winding 22 with the largest span among the n1 layers, the n2 layers and the n3 layers is the n1 layers of secondary windings 22. Winding slots 13 corresponding to the n1 layers of secondary windings 22: of the winding slots 13 numbered 19, 6, 7, and 18, only the secondary winding 22 is provided, that is, the secondary winding 22 is provided in a single slot in the winding slots 13 numbered 19, 6, 7, and 18, and the cross-sectional area of at least one of the winding slots 13 numbered 19, 6, 7, and 18 is S1. The secondary winding 22 with the smallest span among the n1 layers, the n2 layers and the n3 layers is the n3 layers of secondary windings 22. Winding slots 13 corresponding to the n3 layers of secondary windings 22: in the winding slots 13 numbered 21, 4, 9 and 16, both the main winding 21 and the sub-winding 22 are provided, i.e., the main winding 21 and the sub-winding 22 are arranged in common slots in the winding slots 13 numbered 21, 4, 9 and 16. For example, in the example shown in fig. 1 and 2, the cross-sectional area of the two winding slots 13 in which the secondary winding 22 having the largest span is located, i.e., the winding slots 13 numbered 19, 6, 7, and 18, is S1.
Of course, the present invention is not limited thereto, and when only the secondary winding 22 is provided in the two winding slots 13 in which the secondary winding 22 having a span smaller than the maximum span is located in each of the layers of the secondary windings 22, the cross-sectional area of at least one of the two winding slots 13 may also be S1.
In some embodiments of the present invention, the cross-section of at least one of the two winding slots 13 in which the secondary winding 22 having the smallest span is located is S2. Therefore, the number of turns of the secondary winding 22 in the winding slot 13 where the secondary winding 22 with the minimum span is located can be increased, the difference of the number of turns of the secondary winding 22 in each winding slot 13 is reduced, the harmonic content is reduced, the stray loss of the motor is reduced, and the cost performance of the motor is improved. For example, as shown in fig. 1 and 2, the cross-sectional areas of the two winding slots 13 in which the secondary winding 22 having the smallest span is located, i.e., the winding slots 13 numbered 21, 4, 9, and 16, are each S2.
In addition, because the secondary winding 22 has large span, high winding coefficient, high copper wire utilization rate and reduced slot area, the total copper wire utilization rate is reduced, the secondary winding 22 is only arranged in the two winding slots 13 where the secondary winding 22 with the largest span is located, the cross section area of at least one of the two winding slots 13 where the secondary winding 22 with the largest span is located is S1, the cross section area of at least one of the two winding slots 13 where the secondary winding 22 with the smallest span is located is S2, and the requirement that S1/S2 is more than or equal to 0.77 is met, the higher copper wire utilization rate is ensured, the harmonic content of the motor is reduced, and the comprehensive cost performance of the motor is highest.
In some embodiments of the present invention, as shown in fig. 1 and 2, the number of winding slots 13 having an area S1 and provided with only the secondary winding 22 is 2N, where N satisfies: n is more than or equal to 2. Therefore, the two winding slots 13 in which the same layer of secondary winding 22 is located are the winding slots 13 with the cross-sectional area of S1, the number of coil turns in the winding slots 13 with the area of S1 can be further reduced, the difference of the number of coil turns of the secondary winding 22 in each winding slot 13 is reduced, the harmonic content is reduced, the stray loss of the motor is reduced, and the cost performance of the motor is improved.
The number of the winding slots 13 with the area of S1 and provided with the secondary winding 22 is too large, the increase of the copper wire consumption is limited, and the improvement of the motor efficiency is limited. Preferably, as shown in fig. 2, the number of the winding slots 13 having an area S1 and provided with only the secondary winding 22 is four, and the cross-sectional area of the two winding slots 13 (the winding slots 13 numbered 19, 6, 7, and 18) in which the secondary winding 22 with the largest span is located in each stage of the secondary winding 22 is S1, so that the secondary winding 22 has a high copper wire utilization ratio and the overall motor has a high cost performance on the premise of ensuring that the harmonic content of the secondary winding 22 is low.
Of course, the present invention is not limited thereto, and the cross section of at least one winding slot 13 provided with only the main winding 21 may also be S1, and the number of winding slots 13 provided with only the main winding 21 having an area of S1 may be 2N, where N satisfies: n is more than or equal to 2. The number of coil turns of the main winding 21 in the winding slot 13 with the area being S1 can be reduced, the difference of the number of coil turns of the main winding 21 in each winding slot 13 is reduced, and the harmonic content is reduced, so that the stray loss of the motor is reduced, and the cost performance of the motor is improved.
In some embodiments of the present invention, as shown in fig. 1, the cross-sectional areas of a plurality of winding slots 13 provided with both the secondary winding 22 and the primary winding 21 are the same. That is, the cross-sectional areas of all the winding slots 13 in which the secondary winding 22 and the primary winding 21 are simultaneously provided in the winding slots 13 are the same. Therefore, the structure and the processing technology of the stator core 1 can be simplified, and the production efficiency is improved.
Of course, the present invention is not limited thereto, and as shown in fig. 2, the cross-sectional area of at least one winding slot 13 between two winding slots 13 in which the secondary winding 22 with the largest span is located and two winding slots 13 in which the corresponding secondary winding 22 with the smallest span is located is S3, and satisfies: s1 is not less than S3 is not less than S2. For example, in the example shown in fig. 2, the secondary winding 22 with the largest span among the n1 layers, the n2 layers and the n3 layers is the n1 layers of secondary windings 22, the secondary winding 22 with the smallest span is the n3 layers of secondary windings 22, and the winding slots 13 corresponding to the n2 layers of secondary windings 22: the cross-sectional areas of the winding slots 13 numbered 20, 5, 8 and 17 are S3, and S3 satisfies: s1 is not less than S3 is not less than S2. Therefore, the copper wires can be reasonably configured according to the size of the groove type, so that the harmonic content is lower.
Of course, the present invention is not limited to this, and as shown in fig. 2, the cross-sectional area of the winding slot 13 in which only the main winding 21 is provided may be S3, and satisfies: s1 is not less than S3 is not less than S2. This can improve the space factor of the winding groove 13.
In some embodiments of the invention, the number of coil layers per pole secondary winding 22 is three or four. The more the number of layers of the winding, the harmonic content is correspondingly reduced, for example, the harmonic content of the four-layer secondary winding 22 is lower than that of the three-layer secondary winding, but as the number of layers increases, the utilization rate of the copper wire is reduced, and the number of layers of the secondary winding 22 is preferably three or four. Preferably, the number of layers of the secondary winding 22 is 4, and the harmonic content of the secondary winding 22 of the motor is lower.
While stator assemblies 100 according to two specific embodiments of the present invention are described below with reference to fig. 1-3, it is to be understood that the following description is intended to be illustrative only and is not to be construed as limiting the invention.
Example one
As shown in fig. 1 and 3, the stator core 1 has a stator hole 11 penetrating axially, a plurality of stator teeth 12 are provided at intervals in a circumferential direction of the stator hole 11, a winding slot 13 is defined between any two adjacent stator teeth 12, the number of the winding slot 13 is 24, the stator winding 2 includes a main winding 21 and a sub-winding 22, and the main winding 21 and the sub-winding 22 are wound on the stator teeth 12 through the winding slot 13. The number of layers of the main winding 21 is 5, the number of the layers is m1-m5, the m1 layers of the main winding 21 are the main winding 21 with the largest span, the m5 layers of the main winding 21 are the main winding 21 with the smallest span, and the span from the m1 layers to the m5 layers of the main winding 21 is gradually reduced. The number of layers of the secondary winding 22 is 3, n1-n 3. The n1 layers of secondary windings 22 are the secondary windings 22 with the largest span, the n3 layers of secondary windings 22 are the secondary windings 22 with the smallest span, and the span of the secondary windings 22 is gradually reduced from the n1 layers to the n3 layers.
As shown in fig. 1 and 3, only the secondary winding 22 is disposed in the two winding slots 13 in which the secondary winding 22 with the largest span is located in each stage, i.e., the two winding slots 13 in which the n1 layers of secondary windings 22 are located, i.e., only the secondary winding 22 is disposed in the winding slots 13 numbered 18, 7, 19 and 6 as shown in fig. 1, and the cross-sectional area of the winding slot 13 in which the secondary winding 22 with the largest span is located in each stage is S1. That is, the number of winding slots 13 having the cross-sectional area S1 in which only the secondary winding 22 is provided is four.
As shown in fig. 1 and 3, the main winding 21 is simultaneously disposed in the winding slot 13 where the secondary winding 22 with the smallest span and the secondary winding 22 with the middle span are located, that is, the main winding 21 and the secondary winding 22 are simultaneously disposed in the winding slots 13 numbered 17, 8, 16, 9, 20, 5, 21 and 4 as shown in fig. 1, and the cross-sectional area of the winding slot 13 is S2, S1 and S2 satisfy: 0.5-0.77 of S1/S2. The cross-sectional area of the winding slot 13 provided with only the main winding 21 is also S2.
The advantageous effects of the present invention are described below in the form of specific data.
In the related technology, the number of layers of the main winding is 5, the winding is high in sinusoidal degree and low in harmonic content, the number of layers of the auxiliary winding is 3, and the number of turns of the auxiliary winding in each slot is large due to the fact that the main winding and the auxiliary winding share the slot, the magnetic potential difference is obvious, the sinusoidal degree is low, and the harmonic content is high. There is limited space for direct adjustment of the number of turns, e.g., too large a reduction in the number of turns in the N1 layer results in too low a slot fill factor, while less reduction results in less significant harmonic improvement.
For example, in a stator assembly in the related art, the number of winding slots is 24, the cross-sectional area of each winding slot is equal, that is, the winding slots are uniform slots, on the premise of a moderate slot filling rate, the number of turns of N1 layers of the secondary winding is 46, the number of turns of N2 layers is 22, the number of turns of N3 layers is 12, and when the stator assembly is connected to a single-phase ac power supply, a harmonic potential is induced, and the third harmonic content is-20.5%, and the fifth harmonic content is 4.30%. The high harmonic content will result in reduced power factor, reduced efficiency and increased temperature rise.
In the present application, the cross-sectional area of the winding slot 13 with the largest span of the secondary winding 22 (the winding slot 13 with the n1 layers) is reduced to 0.77 times of the original cross-sectional area, and accordingly, the number of turns of the winding slot 13 is reduced, and the main winding 21 with the cross-sectional area S2 is simultaneously disposed in the slot with the smallest span of the secondary winding 22 (the winding slot 13 with the n3 layers). After the corresponding slot area is adjusted, under the condition of moderate slot filling rate, the number of turns of the secondary winding 22 is adjusted to be 35 for n1 layers, 25 for n2 layers and 22 for n3 layers, and meanwhile, the wire diameter of the winding is reduced. After the winding is adjusted, the content of the third harmonic wave is reduced to-14.8%, the content of the fifth harmonic wave is reduced to-1.0%, under the condition of the same motor efficiency, the using amount of copper wires is reduced by about 50g, and the cost performance of the motor is improved. The details are shown in the following table:
in addition, as shown in FIG. 4, the smaller the value of S1/S2, the lower the content of the third harmonic of the sub-winding 22 tends to be. As shown in FIG. 5, the motor efficiency increases and then decreases as S1/S2 decreases. As shown in FIG. 6, as S1/S2 is gradually decreased, the amount of copper wire is decreased and then increased. As shown in fig. 4 to 5, the third harmonic content is reduced within a certain range, so that the stray loss of the motor can be reduced, but after the harmonic content is reduced, the utilization rate of the copper wire is low, which may result in an increase in copper loss, so that after the harmonic content is reduced to a certain degree, the efficiency of the motor may not be improved or reduced.
Along with the reduction of the area of the winding slot 13 with the largest span of the secondary winding 22, the number of turns is reduced, the harmonic content is correspondingly reduced, but the reduction is excessive, the utilization rate of the copper wire is reduced, and within the range of S1/S2 being more than or equal to 0.5 and less than or equal to 0.77, the harmonic content is smaller, the stray loss of the motor is low, the using amount of the copper wire is small, and the cost performance of the motor is high. In the stator assembly 100, the cross-sectional area of the winding slot 13 with the maximum span of the secondary winding 22 is designed to be S1, the cross-sectional area of the winding slot 13 with the small span of the secondary winding 22 is S2, the winding slot and the main winding 21 share the same slot, the small area of the winding slot 13 with the maximum span can cause the low utilization rate of copper wires, and the large area can cause the excessive harmonic content. The invention limits S1/S2 to 0.77 to be more than or equal to 0.5, can greatly reduce the third harmonic content and control the groove filling rate to a reasonable level, and has good manufacturability and good reliability.
Example two
As shown in fig. 2 and 3, the structure of the present embodiment is substantially the same as that of the embodiment, except that the cross-sectional area of the winding slot 13 in which the n2 layers of the secondary windings 22 are located is S3, and the following are satisfied: s1 is not less than S3 is not less than S2. The cross-sectional area of the winding slot 13 in which only the main winding 21 is provided is also S3. The copper wires are reasonably arranged according to the size of the groove type, so that the harmonic content is lower. Preferably, the more the number of layers of the winding, the harmonic content is reduced accordingly, for example, the harmonic content of the four-layer secondary winding 22 is reduced by about 5% compared with the harmonic content of the three layers, but as the number of layers increases, the utilization rate of the copper wire is reduced, and the number of layers of the secondary winding 22 is preferably three or four.
A motor according to an embodiment of the present invention is described below with reference to fig. 1 to 6.
According to an embodiment of the present invention, a motor includes: and a stator assembly 100 as described above, the rotor being disposed within the stator bore 11 and the rotor being rotatable relative to the stator.
According to the motor of the embodiment of the present invention, by making the cross section of at least one winding slot 13 provided with only the secondary winding 22 be S1, the cross section of at least one winding slot 13 provided with both the primary winding 21 and the secondary winding 22 be S2, and satisfying: S1/S2 is not less than 0.5 and not more than 0.77, the number of turns of the secondary winding 22 in the winding slot 13 with the area of S1 and only the secondary winding 22 is arranged can be reduced, the number of turns of the secondary winding 22 in the winding slot 13 with the area of S2 and both the primary winding 21 and the secondary winding 22 are arranged is increased, and the difference of the number of turns of the secondary winding 22 in each winding slot 13 is reduced, so that the harmonic content of the secondary winding 22 is reduced, the stray loss of the motor is reduced, and the cost performance of the motor is improved. In addition, the groove filling rate can be controlled at a reasonable level, the winding wire is prevented from being separated from the winding groove 13, the manufacturing type is good, and the reliability is good. In addition, the high utilization rate of copper wires can be ensured.
A compressor according to an embodiment of the present invention will be described with reference to fig. 1 to 6.
The compressor comprises the motor.
According to the compressor of the embodiment of the present invention, by making the cross section of at least one winding slot 13 provided with only the secondary winding 22 be S1, the cross section of at least one winding slot 13 provided with both the primary winding 21 and the secondary winding 22 be S2, and satisfying: S1/S2 is not less than 0.5 and not more than 0.77, the number of turns of the secondary winding 22 in the winding slot 13 with the area of S1 and only the secondary winding 22 is arranged can be reduced, the number of turns of the secondary winding 22 in the winding slot 13 with the area of S2 and both the primary winding 21 and the secondary winding 22 are arranged is increased, and the difference of the number of turns of the secondary winding 22 in each winding slot 13 is reduced, so that the harmonic content of the secondary winding 22 is reduced, the stray loss of the motor is reduced, and the cost performance of the motor is improved. In addition, the groove filling rate can be controlled at a reasonable level, the winding wire is prevented from being separated from the winding groove 13, the manufacturing type is good, and the reliability is good. In addition, the high utilization rate of copper wires can be ensured.
In some embodiments of the invention, the compressor is a 2HP and above compressor. Experiments show that 0.5-S1/S2-0.77 is better level on the compressor of 2HP and above.
A refrigeration device according to an embodiment of the present invention is described below with reference to fig. 1 to 6.
The refrigeration equipment according to the embodiment of the invention can be a refrigerator, an air conditioner or the like, and comprises the compressor.
According to the refrigeration equipment of the embodiment of the invention, by making the cross section of at least one winding slot 13 only provided with the secondary winding 22 be S1, the cross section area of at least one winding slot 13 provided with the primary winding 21 and the secondary winding 22 is S2, and the following requirements are met: S1/S2 is not less than 0.5 and not more than 0.77, the number of turns of the secondary winding 22 in the winding slot 13 with the area of S1 and only the secondary winding 22 is arranged can be reduced, the number of turns of the secondary winding 22 in the winding slot 13 with the area of S2 and both the primary winding 21 and the secondary winding 22 are arranged is increased, and the difference of the number of turns of the secondary winding 22 in each winding slot 13 is reduced, so that the harmonic content of the secondary winding 22 is reduced, the stray loss of the motor is reduced, and the cost performance of the motor is improved. In addition, the groove filling rate can be controlled at a reasonable level, the winding wire is prevented from being separated from the winding groove 13, the manufacturing type is good, and the reliability is good. In addition, the high utilization rate of copper wires can be ensured.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or 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 invention. In this specification, the schematic representations of the terms used above 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.
While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (10)
1. A stator assembly, comprising:
the stator core is provided with a stator hole which is axially communicated, a plurality of stator teeth are arranged at intervals along the circumferential direction of the stator hole, and a winding slot is defined between any two adjacent stator teeth;
the stator winding comprises a main winding and an auxiliary winding, the main winding and the auxiliary winding pass through the winding slots and are wound on the stator teeth, the cross section of at least one winding slot only provided with the auxiliary winding is S1, and the cross section area of at least one winding slot provided with both the main winding and the auxiliary winding is S2, and the requirements are that: 0.5-0.77 of S1/S2.
2. The stator assembly according to claim 1, wherein only the secondary winding is provided in two of the winding slots in which the secondary winding having the largest span is located in a circumferential direction of the stator core, and at least one of the two winding slots in which the secondary winding having the largest span is located has a cross-sectional area of S1, and the secondary winding having the smallest span is provided in the same winding slot together with the main winding.
3. The stator assembly of claim 2 wherein the cross-section of at least one of the two winding slots in which the secondary winding with the smallest span is located is S2.
4. The stator assembly of claim 2 wherein the number of said winding slots having an area of S1 in which only said secondary windings are provided is 2N, said N satisfying: n is more than or equal to 2.
5. The stator assembly according to claim 1, wherein a plurality of said winding slots provided with said secondary winding and said primary winding at the same time have the same cross-sectional area.
6. The stator assembly according to claim 1, wherein a cross-sectional area of at least one of said winding slots between two of said winding slots in which said secondary winding with the largest span is located and two of said winding slots in which said secondary winding with the smallest span is located is S3, and satisfies: s1 is not less than S3 is not less than S2.
7. The stator assembly of claim 1 wherein the number of coil layers of the secondary winding per pole is three or four.
8. An electric machine, comprising:
a rotor;
a stator assembly according to any one of claims 1 to 7, the rotor being disposed within the stator bore and rotatable relative to the stator.
9. A compressor, characterized by comprising an electric machine according to claim 8.
10. A refrigeration device, characterized by comprising a compressor according to claim 9.
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| CN201811015712.5A CN110875649B (en) | 2018-08-31 | 2018-08-31 | Stator assembly, motor, compressor and refrigeration equipment |
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| CN201811015712.5A CN110875649B (en) | 2018-08-31 | 2018-08-31 | Stator assembly, motor, compressor and refrigeration equipment |
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| CN108429367A (en) * | 2018-05-31 | 2018-08-21 | 广东美芝制冷设备有限公司 | Stator module, motor, compressor and refrigeration equipment |
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| WO2016192345A1 (en) * | 2015-06-01 | 2016-12-08 | 广东威灵电机制造有限公司 | Washing machine and motor for washing machine |
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| CN106208435A (en) * | 2016-07-18 | 2016-12-07 | 广东美芝制冷设备有限公司 | Stator module and there is its motor, compressor and refrigeration plant |
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