CN107370259B - Stator, motor, compressor and refrigeration equipment - Google Patents
Stator, motor, compressor and refrigeration equipment Download PDFInfo
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- CN107370259B CN107370259B CN201710724144.5A CN201710724144A CN107370259B CN 107370259 B CN107370259 B CN 107370259B CN 201710724144 A CN201710724144 A CN 201710724144A CN 107370259 B CN107370259 B CN 107370259B
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- 238000005057 refrigeration Methods 0.000 title claims abstract description 9
- 238000004804 winding Methods 0.000 claims abstract description 524
- 239000010410 layer Substances 0.000 claims abstract description 252
- 239000002356 single layer Substances 0.000 claims abstract description 12
- 239000011162 core material Substances 0.000 abstract description 21
- 238000004519 manufacturing process Methods 0.000 abstract description 8
- 239000011295 pitch Substances 0.000 description 12
- 238000000034 method Methods 0.000 description 7
- 239000003990 capacitor Substances 0.000 description 5
- 229910000831 Steel Inorganic materials 0.000 description 4
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- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000004080 punching Methods 0.000 description 2
- 230000003313 weakening effect Effects 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 230000007547 defect Effects 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
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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
- 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
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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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Abstract
The invention discloses a stator, a motor, a compressor and refrigeration equipment, which comprises a stator core and coil windings, wherein the stator core is provided with N stator slots uniformly distributed along the circumferential direction, the coil windings comprise a first main winding and a second main winding which are symmetrically arranged, and a first auxiliary winding and a second auxiliary winding which are symmetrically arranged, the first main winding and the second main winding respectively comprise N1 layers of main winding coils, the first auxiliary winding and the second auxiliary winding respectively comprise N2 layers of auxiliary winding coils, each layer of main winding coils or each layer of auxiliary winding coils are embedded in two stator slots, and each stator slot is embedded with a single-layer coil, and the requirements are that: n=4× (n1+n2), n2.ltoreq.n1.ltoreq.4. The main winding and the auxiliary winding are respectively and symmetrically arranged, and a stator slot is limited and only a single-layer coil is placed, so that the utilization rate of stator core materials is improved while the low-order harmonic wave of the motor is reduced, and the production cost is saved.
Description
Technical Field
The invention relates to the technical field of compressors, in particular to a stator, a motor, a compressor and refrigeration equipment.
Background
Single-phase motors employing a two-pole winding structure are widely used in compressors with non-adjustable rotation speed due to their reliability and excellent performance. In the prior art, when the stator slots of the single-phase motor are more, a coil winding structure with at least one layer of main winding coil and one layer of auxiliary winding coil sharing one stator slot is often arranged, so that the motor is prevented from inducing excessive harmonic potential, particularly low-order third harmonic potential and fifth harmonic potential on the coil winding in the starting process, and the situations of slow starting, excessive noise and the like of the motor are avoided.
On the other hand, the filling rate of the stator slot of the motor adopting the winding structure is generally low, and the situation that part of the stator slot is empty exists, so that the material is wasted, and the production cost is increased; and the winding coefficient of the motor is low at this time, so that the motor performance is reduced and the market competitiveness is lacking.
Therefore, for the single-phase motor adopting the two-pole winding structure, the engineering industry needs to further optimize the structure.
Disclosure of Invention
Aiming at the defects or shortcomings in the prior art, the invention provides a stator, a motor, a compressor and refrigeration equipment, which can reduce the third harmonic potential and the fifth harmonic potential generated in the starting process of the motor, improve the performance of the motor, improve the utilization rate of stator core materials and save the production cost.
In order to achieve the above object, the present invention provides a stator, including a stator core and a coil winding, where the stator core is provided with N stator slots uniformly distributed along a circumferential direction, the coil winding includes a first main winding and a second main winding which are symmetrically arranged, and a first auxiliary winding and a second auxiliary winding which are symmetrically arranged, the first main winding and the second main winding include N1 layers of main winding coils respectively, the first auxiliary winding and the second auxiliary winding include N2 layers of auxiliary winding coils respectively, each layer of main winding coil or each layer of auxiliary winding coil is embedded in two stator slots, and each stator slot is embedded with a single layer of coil, and: n=4× (n1+n2).
Preferably, N1 is greater than or equal to N2 is greater than or equal to 2.
Preferably, the stator core is provided with 20 stator slots uniformly distributed along the circumferential direction, the first main winding and the second main winding respectively comprise 3 layers of main winding coils, and the first auxiliary winding and the second auxiliary winding respectively comprise 2 layers of auxiliary winding coils.
Preferably, the stator grooves include first to twentieth stator grooves arranged in sequence at equal intervals in a circumferential direction; the first main winding comprises a first layer of main winding coil, a second layer of main winding coil and a third layer of main winding coil, and the second main winding comprises a fourth layer of main winding coil, a fifth layer of main winding coil and a sixth layer of main winding coil;
The first layer of main winding coil is embedded in the first stator slot and the tenth stator slot, the second layer of main winding coil is embedded in the second stator slot and the ninth stator slot, the third layer of main winding coil is embedded in the third stator slot and the eighth stator slot, the fourth layer of main winding coil is embedded in the eleventh stator slot and the twentieth stator slot, the fifth layer of main winding coil is embedded in the twelfth stator slot and the nineteenth stator slot, and the sixth layer of main winding coil is embedded in the thirteenth stator slot and the eighteenth stator slot.
Preferably, the first auxiliary winding comprises a first layer auxiliary winding coil and a second layer auxiliary winding coil, and the second auxiliary winding comprises a third layer auxiliary winding coil and a fourth layer auxiliary winding coil;
The first layer of auxiliary winding coil is embedded in a fifth stator slot and a sixteenth stator slot, the second layer of auxiliary winding coil is embedded in a fourth stator slot and a seventeenth stator slot, the third layer of auxiliary winding coil is embedded in a sixth stator slot and a fifteenth stator slot, and the fourth layer of auxiliary winding coil is embedded in a seventh stator slot and a fourteenth stator slot.
Preferably, the outer diameter D of the stator core is: d is more than or equal to 80mm and less than or equal to 125mm.
Preferably, the sum of the cross-sectional areas of the N1 layers of the main winding coils in the first main winding or the second main winding is larger than the sum of the cross-sectional areas of the N2 layers of the auxiliary winding coils in the first auxiliary winding or the second auxiliary winding.
Preferably, N1 > N2.
Preferably, the cross section of the single-layer coil embedded in the stator slot is round or square.
Preferably, the first main winding and the second main winding are symmetrically arranged about a main winding radial symmetry line, the first auxiliary winding and the second auxiliary winding are symmetrically arranged about an auxiliary winding radial symmetry line, and the main winding radial symmetry line is perpendicular to the auxiliary winding radial symmetry line.
In addition, the invention also provides a motor comprising the stator.
In addition, the invention also provides a compressor comprising the motor.
In addition, the invention also provides refrigeration equipment comprising the compressor.
Through the technical scheme, the stator structure of the motor is optimized, so that the main winding and the auxiliary winding are respectively and symmetrically arranged, a single-layer coil is limited to one stator slot, the utilization rate of stator core materials is improved while the low-order harmonic wave of the motor is reduced, and the production cost is saved.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Drawings
The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate the invention and together with the description serve to explain, without limitation, the invention. In the drawings:
FIG. 1 is a top view of a stator with 20 stator slots in an embodiment;
Fig. 2 is a top view of a stator provided with 28 stator slots in an embodiment.
Reference numerals illustrate:
1: a stator core;
21: a first main winding; 22: a second main winding;
31: a first secondary winding; 32: a second secondary winding;
4: radial symmetry line of the main winding; 5: radial symmetry line of the auxiliary winding;
S1-S28: first to twenty-eighth stator slots;
m1 to m8: first to eighth layers of main winding coils;
a1 to a6: the first layer auxiliary winding coil to the sixth layer auxiliary winding coil.
Detailed Description
The following describes specific embodiments of the present invention in detail with reference to the drawings. It should be understood that the detailed description and specific examples, while indicating and illustrating the invention, are not intended to limit the invention.
It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other.
In the present invention, unless otherwise indicated, terms of orientation such as "upper, lower, top, bottom" are used generally with respect to the orientation shown in the drawings or with respect to the positional relationship of the various components with respect to one another in the vertical, vertical or gravitational directions.
The invention will be described in detail below with reference to the drawings in connection with embodiments.
The invention provides a stator, which comprises a stator core 1 and a coil winding, wherein the stator core 1 is provided with N stator slots uniformly distributed along the circumferential direction, the coil winding comprises a first main winding 21 and a second main winding 22 which are symmetrically arranged, and a first auxiliary winding 31 and a second auxiliary winding 32 which are symmetrically arranged, the first main winding 21 and the second main winding 22 respectively comprise N1 layers of main winding coils, the first auxiliary winding 31 and the second auxiliary winding 32 respectively comprise N2 layers of auxiliary winding coils, each layer of main winding coils or each layer of auxiliary winding coils are embedded in two stator slots, and each stator slot is embedded with a single-layer coil, and the stator slot is provided with the following advantages: n=4× (n1+n2).
The two stator slots of the first main winding 21 where the one layer of main winding coil with the largest number of crossing stator slots is located are correspondingly and adjacently arranged with the two stator slots of the second main winding 22 where the one layer of main winding coil with the largest number of crossing stator slots is located; similarly, the two stator slots of the first secondary winding 31 where the one-layer secondary winding coil having the largest number of stator slots is located are correspondingly and adjacently arranged with the two stator slots of the second secondary winding 32 where the one-layer secondary winding coil having the largest number of stator slots is located.
In the stator structure, under the condition that the main winding and the auxiliary winding are respectively symmetrically arranged, a single-layer coil can only be placed in a limited stator slot, a winding mode that a plurality of main winding coils and auxiliary winding coils are stacked in one stator slot is avoided, and the limited stator slot and the main winding coils and the auxiliary winding coils meet the relation: n=4× (n1+n2), further ensures that all stator slots have placed coils therein, improves the utilization rate of stator core materials, and saves production cost.
Specifically, the main winding coil and the auxiliary winding coil of the stator satisfy the following conditions: n1 is more than or equal to N2 is more than or equal to 2. That is, the number of layers of the main winding coil in the first main winding 21 or the second main winding 22 is always equal to or greater than the number of layers of the sub winding coil in the first sub winding 31 or the second sub winding 32, and neither the number of layers of the main winding coil nor the sub winding coil can be less than 2 layers.
As shown in fig. 1, the number of stator slots of the stator is 20, the first main winding 21 and the second main winding 22 each include 3 layers of main winding coils, and the first auxiliary winding 31 and the second auxiliary winding 32 each include 2 layers of auxiliary winding coils. The stator core 1 is formed by punching a plurality of electromagnetic steel plates having a thickness of 0.1 to 1.5mm into a predetermined shape and laminating the electromagnetic steel plates in the circumferential direction by caulking, welding, or the like.
At this time, the number of primary winding coil layers N1 of the first primary winding 21 and the second primary winding 22 is equal to 3, the number of secondary winding coil layers N2 of the first secondary winding 31 and the second secondary winding 32 is equal to 2, and the number of stator slots n=4× (3+2) =20, so that each stator slot in the above stator structure has and only a single layer of coil is placed, and the utilization of the stator core material is high.
Specifically, the above-described stator grooves include first to twentieth stator grooves S1 to S20 which are sequentially arranged at equal intervals in the circumferential direction; the first main winding 21 includes a first layer main winding coil m1, a second layer main winding coil m2, and a third layer main winding coil m3, and the second main winding 22 includes a fourth layer main winding coil m4, a fifth layer main winding coil m5, and a sixth layer main winding coil m6.
Wherein, the first layer of main winding coil m1 is embedded in the first stator slot S1 and the tenth stator slot S10, the second layer of main winding coil m2 is embedded in the second stator slot S2 and the ninth stator slot S9, the third layer of main winding coil m3 is embedded in the third stator slot S3 and the eighth stator slot S8, the fourth layer of main winding coil m4 is embedded in the eleventh stator slot S11 and the twentieth stator slot S20, the fifth layer of main winding coil m5 is embedded in the twelfth stator slot S12 and the nineteenth stator slot S19, and the sixth layer of main winding coil m6 is embedded in the thirteenth stator slot S13 and the eighteenth stator slot S18.
From the above, the stator slot pitches of the first layer main winding coil m1 and the fourth layer main winding coil m4 are 9, the stator slot pitches of the second layer main winding coil m2 and the fifth layer main winding coil m5 are 7, and the stator slot pitches of the third layer main winding coil m3 and the sixth layer main winding coil m6 are 5.
More specifically, the stator structure satisfies N1 > N2, and further provides that the number of the primary winding coils m1 of the first layer to the primary winding coils m6 of the sixth layer is 58, and the number of the secondary winding coils a1 of the first layer to the secondary winding coils a4 of the fourth layer is 65.
When the main winding is connected with a single-phase alternating power supply, harmonic potential is induced, and the method is concretely as follows:
The fundamental winding coefficient corresponding to the first layer main winding coil m1 and the fourth layer main winding coil m4 is b11, b11=sin {1 (9/10) × (pi/2) } is approximately 0.9877;
The 3-order harmonic winding coefficient corresponding to the first layer main winding coil m1 and the fourth layer main winding coil m4 is t11, t11=sin {3 (9/10) × (pi/2) } is approximately equal to-0.8910;
the 5 th harmonic winding coefficient corresponding to the first layer main winding coil m1 and the fourth layer main winding coil m4 is f11, f11=sin {5 (9/10) × (pi/2) } is approximately 0.7071.
The fundamental winding coefficient corresponding to the second layer main winding coil m2 and the fifth layer main winding coil m5 is b12, and b12=sin {1 (7/10) × (pi/2) } is approximately 0.8910;
The 3 rd harmonic winding coefficient t12, t12=sin {3 (7/10) × (pi/2) } is approximately equal to-0.1564 corresponding to the second layer main winding coil m2 and the fifth layer main winding coil m 5;
The second layer main winding coil m2 and the fifth layer main winding coil m5 correspond to the 5 th harmonic winding coefficient f12, f12=sin {5 (7/10) × (pi/2) } approximately equal to-0.7071.
The fundamental winding coefficient corresponding to the third layer main winding coil m3 and the sixth layer main winding coil m6 is b13, b13=sin {1 (5/10) × (pi/2) } is approximately 0.7071;
The third layer main winding coil m3 and the sixth layer main winding coil m6 correspond to the 3 rd harmonic winding coefficient t13, t13=sin {3 (5/10) × (pi/2) } approximately to 0.7071;
The third layer main winding coil m3 and the sixth layer main winding coil m6 correspond to the 5 th harmonic winding coefficient f13, f13=sin {5 (5/10) × (pi/2) } approximately equal to-0.7071.
The total fundamental winding coefficient of the main windings is b 1:
b1＝(58*0.9877+58*0.8910+58*0.7071)/(58+58+58)≈0.8619；
The total 3 rd harmonic winding coefficient of the main winding is t1, then:
t1＝{58*(-0.8910)+58*(-0.1564)+58*0.7071}/(58+58+58)≈-0.1134；
the total 5 th harmonic winding coefficient of the main winding is f1, then:
f1＝{58*(0.7071)+58*(-0.7071)+58*(-0.7071)}/(58+58+58)≈-0.2357。
From the above data, the 3 and 5-order harmonic winding magnetic potential of the main winding can be further calculated, namely:
the total 3 rd harmonic winding magnetic potential of the main winding is Ft1, and:
Ft1＝|-0.1134/(3*0.8619)|*100％≈4.39％；
the total 5 th harmonic winding magnetic potential of the main winding is Ff1, and:
Ff1＝|-0.2357/(5*0.8619)|*100％≈5.46％。
In addition, the first auxiliary winding 31 of the stator having 20 stator slots includes a first layer auxiliary winding coil a1 and a second layer auxiliary winding coil a2, and the second auxiliary winding 32 includes a third layer auxiliary winding coil a3 and a fourth layer auxiliary winding coil a4.
Wherein, the first layer of auxiliary winding coil a1 is embedded in the fifth stator slot S5 and the sixteenth stator slot S16, the second layer of auxiliary winding coil a2 is embedded in the fourth stator slot S4 and the seventeenth stator slot S17, the third layer of auxiliary winding coil a3 is embedded in the sixth stator slot S6 and the fifteenth stator slot S15, and the fourth layer of auxiliary winding coil a4 is embedded in the seventh stator slot S7 and the fourteenth stator slot S14.
As can be seen from the above, the stator slot pitches of the first-layer auxiliary winding coil a1 and the third-layer auxiliary winding coil a3 are 9, and the stator slot pitches of the second-layer auxiliary winding coil a2 and the fourth-layer auxiliary winding coil a4 are 7.
Similarly, when the auxiliary winding is connected to a single-phase alternating power supply, harmonic potentials are induced, as follows:
The fundamental winding coefficient corresponding to the first layer auxiliary winding coil a1 and the third layer auxiliary winding coil a3 is b21, b21=sin {1 (9/10) × (pi/2) } is approximately 0.9877;
The 3-order harmonic winding coefficient corresponding to the first layer auxiliary winding coil a1 and the third layer auxiliary winding coil a3 is t21, t21=sin {3 (9/10) × (pi/2) } is approximately equal to-0.8910;
the 5 th harmonic winding coefficient corresponding to the first layer auxiliary winding coil a1 and the third layer auxiliary winding coil a3 is f21, f21=sin {5 (9/10) × (pi/2) } approximately 0.7071.
The fundamental winding coefficient corresponding to the second layer auxiliary winding coil a2 and the fourth layer main winding coil a4 is b22, and b22=sin {1 (7/10) × (pi/2) } is approximately 0.8910;
The 3 rd harmonic winding coefficient t22, t22=sin {3 (7/10) × (pi/2) } is approximately equal to-0.1564 corresponding to the second layer auxiliary winding coil a2 and the fourth layer main winding coil a 4;
The second layer auxiliary winding coil a2 and the fourth layer main winding coil a4 correspond to the 5 th harmonic winding coefficient f22, f22=sin {5 (7/10) × (pi/2) } approximately equal to-0.7071.
The total fundamental winding coefficient of the secondary windings is b 2:
b2＝(65*0.9877+65*0.8910)/(65+65)≈0.9393；
the total 3 rd harmonic winding coefficient of the secondary winding is t2, then:
t2＝(65*(-0.8910)+65*(-0.1564))/(65+65)≈-0.5237；
the total 5 th harmonic winding coefficient of the secondary winding is f2, then:
f2＝(65*(0.7071)+65*(-0.7071))/(65+65)≈0。
from the above data, the 3 and 5-order harmonic winding magnetic potential of the secondary winding can be further calculated, namely:
the total 3 rd harmonic winding magnetic potential of the auxiliary winding is Ft2, and:
Ft2＝|-0.5237/(3*0.9393)|*100％≈18.58％；
the total 5 th harmonic winding magnetic potential of the auxiliary winding is Ff2, and:
Ff2＝|0/(5*0.9393)|*100％≈0％。
the above calculation results are summarized in the following table:
As is clear from the above table, the total 3-order harmonic winding magnetic potential generated by each winding coil in the main winding of the stator when the single-phase alternating power supply is turned on is about 4.39%, the total 5-order harmonic winding magnetic potential generated is about 5.46%, and the total harmonic magnetic potential generated by the stator is relatively low, and the 3-order and 5-order harmonic torques are relatively small compared with the general technique. On the other hand, although the total 3 rd harmonic winding magnetic potential generated in the secondary winding is high, the secondary winding in the single-phase motor is connected in series with the split-phase capacitor, and the split-phase capacitor has a certain weakening effect on the 3 rd harmonic, so the total harmonic magnetic potential generated in the secondary winding is also low, and the corresponding generated harmonic torque is also low. Therefore, the stator structure can fully utilize stator slots and simultaneously reduce the generation of low-order harmonic electric potential, so that the motor can be started smoothly and rapidly.
Preferably, for the above stator having 20 stator slots in the present invention, the outer diameter D of the stator core 1 thereof should satisfy: d is more than or equal to 80mm and less than or equal to 125mm.
The outer diameter of the stator core is limited in the value range, which is equivalent to limiting the whole size of the stator, so that the power density of the motor is maximized under the condition that the motor meets the requirement of reducing harmonic waves and fully utilizes stator slots of the motor, and the production cost is further reduced.
More specifically, the sum of the cross-sectional areas of the N1 layer main winding coils in the first main winding 21 or the second main winding 22 of the stator in the present invention is larger than the sum of the cross-sectional areas of the N2 layer auxiliary winding coils in the first auxiliary winding 31 or the second auxiliary winding 32.
For example, for the above stator having 20 stator slots, the diameter of its single main winding coil is Φa1, Φa1=0.85 mm, and the diameter of its single sub winding coil is Φb1, Φb1=0.8 mm. It is readily available that the ratio k1 of the sum of the cross-sectional areas of the 3-layer main winding coil in the first main winding 21 or the second main winding 22 to the sum of the cross-sectional areas of the 2-layer auxiliary winding coil in the first auxiliary winding 31 or the second auxiliary winding 32 is:
k1＝((58+58+58)*0.85*0.85)/((65+65)*0.8*0.8)≈1.51≥1。
at this time, the above stator having 20 stator slots satisfies the above requirement.
As shown in fig. 2, the number of stator slots of the stator is 28, the first main winding 21 and the second main winding 22 each include 4 layers of main winding coils, and the first auxiliary winding 31 and the second auxiliary winding 32 each include 3 layers of auxiliary winding coils. The stator core 1 is formed by punching a plurality of electromagnetic steel plates having a thickness of 0.1 to 1.5mm into a predetermined shape and laminating the electromagnetic steel plates in the circumferential direction by caulking, welding, or the like.
At this time, the number of primary winding coil layers N1 of the first primary winding 21 and the second primary winding 22 is equal to 4, the number of secondary winding coil layers N2 of the first secondary winding 31 and the second secondary winding 32 is equal to 3, and the number of stator slots n=4× (4+3) =28, so that each stator slot in the above stator structure has and only a single layer of coil is placed, and the utilization of the stator core material is high.
Specifically, the above stator grooves include first to twenty-eighth stator grooves S1 to S28 arranged in order at equal intervals in the circumferential direction; the first main winding 21 includes a first layer main winding coil m1, a second layer main winding coil m2, a third layer main winding coil m3, and a fourth layer main winding coil m4, and the second main winding 22 includes a fifth layer main winding coil m5, a sixth layer main winding coil m6, a seventh layer main winding coil m7, and an eighth layer main winding coil m8.
Wherein, the first layer of main winding coil m1 is embedded in the first stator slot S1 and the fourteenth stator slot S14, the second layer of main winding coil m2 is embedded in the second stator slot S2 and the thirteenth stator slot S13, the third layer of main winding coil m3 is embedded in the third stator slot S3 and the twelfth stator slot S12, the fourth layer of main winding coil m4 is embedded in the fourth stator slot S4 and the eleventh stator slot S11, the fifth layer of main winding coil m5 is embedded in the fifteenth stator slot S15 and the twenty-eighth stator slot S28, the sixth layer of main winding coil m6 is embedded in the sixteenth stator slot S16 and the twenty-seventh stator slot S27, the seventh layer of main winding coil m7 is embedded in the seventeenth stator slot S17 and the twenty-sixth stator slot S26, and the eighteenth layer of main winding coil m8 is embedded in the eighteenth stator slot S18 and the twenty-fifth stator slot S25.
From the above, the first layer of main winding coil m1 and the fifth layer of main winding coil m5 have 13 stator slot pitches, the second layer of main winding coil m2 and the sixth layer of main winding coil m6 have 11 stator slot pitches, the third layer of main winding coil m3 and the seventh layer of main winding coil m7 have 9 stator slot pitches, and the fourth layer of main winding coil m4 and the eighth layer of main winding coil m8 have 7 stator slot pitches.
More specifically, the stator structure satisfies N1 > N2, and further provides that the number of the primary winding coils m1 of the first layer to the primary winding coils m8 of the eighth layer is 43, and the number of the secondary winding coils a1 of the first layer to the secondary winding coils a6 of the sixth layer is 44.
When the main winding is connected with a single-phase alternating power supply, harmonic potential is induced, and the method is concretely as follows:
The fundamental winding coefficient corresponding to the first layer main winding coil m1 and the fifth layer main winding coil m5 is b31, and b31=sin {1 (13/14) × (pi/2) } is approximately 0.9937;
the 3-order harmonic winding coefficient corresponding to the first layer main winding coil m1 and the fifth layer main winding coil m5 is t31, t31=sin {3 (13/14) × (pi/2) } is approximately equal to-0.9439;
The 5 th harmonic winding coefficient corresponding to the first layer main winding coil m1 and the fifth layer main winding coil m5 is f31, f31=sin {5 (13/14) × (pi/2) } approximately 0.8467.
The fundamental winding coefficient corresponding to the second layer main winding coil m2 and the sixth layer main winding coil m6 is b32, and b32=sin {1 (11/14) × (pi/2) } is approximately 0.9439;
the 3 rd harmonic winding coefficients t32, t32=sin {3 (11/14) × (pi/2) } are approximately equal to-0.5320 corresponding to the second layer main winding coil m2 and the sixth layer main winding coil m 6;
the second layer main winding coil m2 and the sixth layer main winding coil m6 correspond to the 5 th harmonic winding coefficient f32, f32=sin {5 (11/14) × (pi/2) } approximately equal to-0.1120.
The fundamental winding coefficient corresponding to the third layer main winding coil m3 and the seventh layer main winding coil m7 is b33, b33=sin {1 (9/14) × (pi/2) } is approximately 0.8467;
The third layer main winding coil m3 and the seventh layer main winding coil m7 correspond to the 3 rd harmonic winding coefficient t33, t33=sin {3 (9/14) × (pi/2) } approximately to 0.1120;
The 5 th harmonic winding coefficient f33, f33=sin {5 (9/14) × (pi/2) } is approximately equal to-0.9439 corresponding to the third layer main winding coil m3 and the seventh layer main winding coil m 7.
The fundamental winding coefficient corresponding to the fourth layer main winding coil m4 and the eighth layer main winding coil m8 is b34, and b34=sin {1 (7/14) × (pi/2) } is approximately 0.7071;
the 3 rd harmonic winding coefficient t34, t34=sin {3 (7/14) × (pi/2) } is about 0.7071 corresponding to the fourth layer main winding coil m4 and the eighth layer main winding coil m 8;
The fourth layer main winding coil m4 and the eighth layer main winding coil m8 correspond to the 5 th harmonic winding coefficient f34, f34=sin {5 (7/14) × (pi/2) } approximately equal to-0.7071.
The total fundamental winding coefficient of the main windings is b 3:
b3＝(43*0.9937+43*0.9439+43*0.8467+43*0.7071)/(43+43+43+43)≈0.8729；
The total 3 rd harmonic winding coefficient of the main winding is t 3:
t3＝{43*(-0.9439)+43*(-0.5320)+43*0.1120+43*0.7071}/(43+43+43+43)≈-0.1642；
the total 5 th harmonic winding coefficient of the main winding is f3, then:
f3＝{43*(0.8467)+43*(-0.1120)+43*(-0.9439)+43*(-0.7071)}/(43+43+43+43)≈-0.2291。
From the above data, the 3 and 5-order harmonic winding magnetic potential of the main winding can be further calculated, namely:
the total 3 rd harmonic winding magnetic potential of the main winding is Ft3, and:
Ft3＝|-0.1642/(3*0.8729)|*100％≈6.27％；
the total 5 th harmonic winding magnetic potential of the main winding is Ff3, and:
Ff3＝|-0.2291/(5*0.8729)|*100％≈5.25％。
in addition, the first auxiliary winding 31 of the stator having 28 stator slots includes a first layer auxiliary winding coil a1, a second layer auxiliary winding coil a2, and a third layer auxiliary winding coil a3, and the second auxiliary winding 32 includes a fourth layer auxiliary winding coil a4, a fifth layer auxiliary winding coil a5, and a sixth layer auxiliary winding coil a6;
Wherein, the first layer of auxiliary winding coil a1 is embedded in the seventh stator slot S7 and the twenty-second stator slot S22, the second layer of auxiliary winding coil a2 is embedded in the sixth stator slot S6 and the twenty-third stator slot S23, the third layer of auxiliary winding coil a3 is embedded in the fifth stator slot S5 and the twenty-fourth stator slot S24, the fourth layer of auxiliary winding coil a4 is embedded in the eighth stator slot S8 and the twenty-first stator slot S21, the fifth layer of auxiliary winding coil a5 is embedded in the ninth stator slot S9 and the twenty-first stator slot S20, and the sixth layer of auxiliary winding coil a6 is embedded in the tenth stator slot S10 and the nineteenth stator slot S19.
From the above, the stator slot pitches of the first layer auxiliary winding coil a1 and the fourth layer auxiliary winding coil a4 are 13, the stator slot pitches of the second layer auxiliary winding coil a2 and the fifth layer auxiliary winding coil a5 are 11, and the stator slot pitches of the third layer auxiliary winding coil a3 and the sixth layer auxiliary winding coil a6 are 9.
Similarly, when the auxiliary winding is connected to a single-phase alternating power supply, harmonic potentials are induced, as follows:
the fundamental winding coefficient corresponding to the first layer auxiliary winding coil a1 and the fourth layer auxiliary winding coil a4 is b41, and b41=sin {1 (13/14) × (pi/2) } is approximately 0.9937;
The 3-order harmonic winding coefficient corresponding to the first layer auxiliary winding coil a1 and the fourth layer auxiliary winding coil a4 is t41, t41=sin {3 (13/14) (pi/2) } is approximately equal to-0.9439;
the 5 th harmonic winding coefficient corresponding to the first layer auxiliary winding coil a1 and the fourth layer auxiliary winding coil a4 is f41, f41=sin {5 (13/14) (pi/2) } approximately 0.8467.
The fundamental winding coefficient corresponding to the second layer auxiliary winding coil a2 and the fifth layer main winding coil a5 is b42, and b42=sin {1 (11/14) × (pi/2) } is approximately 0.9439;
The 3 rd harmonic winding coefficient t42 corresponding to the second layer auxiliary winding coil a2 and the fifth layer main winding coil a5 is t42=sin {3 (11/14) × (pi/2) } approximately equal to-0.5320;
The second layer auxiliary winding coil a2 and the fifth layer main winding coil a5 correspond to the 5 th harmonic winding coefficient f42, f42=sin {5 (11/14) × (pi/2) } approximately equal to-0.1120.
The fundamental winding coefficient corresponding to the third layer auxiliary winding coil a3 and the sixth layer main winding coil a6 is b43, and b43=sin {1 (9/14) × (pi/2) } is approximately 0.8467;
the third layer auxiliary winding coil a3 and the sixth layer main winding coil a6 correspond to the 3 rd harmonic winding coefficient t43, t43=sin {3 (9/14) × (pi/2) } approximately 0.1120;
the third layer auxiliary winding coil a3 and the sixth layer main winding coil a6 correspond to the 5 th harmonic winding coefficient f43, f43=sin {5 (9/14) × (pi/2) } approximately equal to-0.9439.
The total fundamental winding coefficient of the secondary windings is b 4:
b4＝(44*0.9937+65*0.9439+44*0.8467)/(44+44+44)≈0.9281；
the total 3 rd harmonic winding coefficient of the secondary winding is t4, then:
t4＝(44*(-0.9439)+44*(-0.5320)+44*0.1120)/(44+44+44)≈-0.4546；
the total 5 th harmonic winding coefficient of the secondary winding is f4, then:
f4＝(44*(0.8467)+44*(-0.1120)+44*(-0.9439))/(44+44+44)≈-0.0697；
from the above data, the 3 and 5-order harmonic winding magnetic potential of the secondary winding can be further calculated, namely:
The total 3 rd harmonic winding magnetic potential of the secondary winding is Ft4, and:
Ft4＝|-0.4546/(3*0.9281)|*100％≈16.33％；
the total 5 th harmonic winding magnetic potential of the auxiliary winding is Ff4, and:
Ff4＝|-0.0697/(5*0.9281)|*100％≈1.50％。
the above calculation results are summarized in the following table:
As is clear from the above table, the total 3-order harmonic winding magnetic potential generated by each winding coil in the main winding of the stator when the single-phase alternating power supply is turned on is about 6.27%, the total 5-order harmonic winding magnetic potential generated is about 5.25%, and the total harmonic magnetic potential generated by the stator is relatively low, and the 3-order and 5-order harmonic torques are relatively small compared with the general technique. On the other hand, although the total 3 rd harmonic winding magnetic potential generated in the secondary winding is high, the secondary winding in the single-phase motor is connected in series with the split-phase capacitor, and the split-phase capacitor has a certain weakening effect on the 3 rd harmonic, so the total harmonic magnetic potential generated in the secondary winding is also low, and the corresponding generated harmonic torque is also low. Therefore, the stator structure can fully utilize stator slots and simultaneously reduce the generation of low-order harmonic electric potential, so that the motor can be started smoothly and rapidly.
Preferably, for the above stator having 28 stator slots in the present invention, the outer diameter D of the stator core 1 thereof should satisfy: d is more than or equal to 120mm and less than or equal to 160mm.
The outer diameter of the stator core is limited in the value range, which is equivalent to limiting the whole size of the stator, so that the power density of the motor is maximized under the condition that the motor meets the requirement of reducing harmonic waves and fully utilizes stator slots of the motor, and the production cost is further reduced.
More specifically, the sum of the cross-sectional areas of the N1 layer main winding coils in the first main winding 21 or the second main winding 22 of the stator in the present invention is larger than the sum of the cross-sectional areas of the N2 layer auxiliary winding coils in the first auxiliary winding 31 or the second auxiliary winding 32.
For example, for the above stator having 28 stator slots, the diameter of its single main winding coil is Φa2, Φa2=0.85 mm, and the diameter of its single auxiliary winding coil is Φb2, Φb2=0.825 mm. It is readily available that the ratio k2 of the sum of the cross-sectional areas of the 4-layer main winding coil in the first main winding 21 or the second main winding 22 to the sum of the cross-sectional areas of the 3-layer auxiliary winding coil in the first auxiliary winding 31 or the second auxiliary winding 32 is:
k2＝((43+43+43+43)*0.85*0.85)/((44+44+44)*0.825*0.825)≈1.38≥1。
at this time, the above stator having 28 stator slots satisfies the above requirement.
Specifically, the cross section of the single-layer coil embedded in all the stator slots can be round or square.
Specifically, the first main windings 21 and the second main windings 22 of all the stators described above are symmetrically arranged about the main winding radial symmetry line 4, the first auxiliary windings 31 and the second auxiliary windings 32 are symmetrically arranged about the auxiliary winding radial symmetry line 5, and the main winding radial symmetry line 4 is perpendicular to the auxiliary winding radial symmetry line 5. That is, the main winding and the auxiliary winding are arranged in a mutually perpendicular winding mode, and the split phase action of the capacitor ensures that the motor generates a complete rotating magnetic field near the stator when the motor is powered on, so that the motor rotates.
On the basis of the optimized structure of the stator, the invention also provides a motor which comprises the stator. By adopting the stator, low-order harmonic waves generated in the running process of the motor can be reduced, the performance of the motor is improved, and the production cost of the motor is saved.
The invention also provides a compressor which comprises the motor, and the overall performance of the compressor can be improved by adopting the motor.
Similarly, the invention also provides a refrigeration device which comprises the compressor, and the overall performance of the refrigeration device can be improved by adopting the compressor.
The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to the specific details of the above embodiments, and various simple modifications can be made to the technical solution of the present invention within the scope of the technical concept of the present invention, and all the simple modifications belong to the protection scope of the present invention.
In addition, the specific features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various possible combinations are not described further.
Moreover, any combination of the various embodiments of the invention can be made without departing from the spirit of the invention, which should also be considered as disclosed herein.
Claims (9)
1. The stator comprises a stator core (1) and coil windings, wherein the stator core (1) is provided with N stator slots uniformly distributed along the circumferential direction, and is characterized in that the coil windings comprise a first main winding (21) and a second main winding (22) which are symmetrically arranged, a first auxiliary winding (31) and a second auxiliary winding (32) which are symmetrically arranged, the first main winding (21) and the second main winding (22) respectively comprise N1-layer main winding coils, the first auxiliary winding (31) and the second auxiliary winding (32) respectively comprise N2-layer auxiliary winding coils, each layer of main winding coils or each layer of auxiliary winding coils are embedded in two stator slots, each stator slot is embedded with a single-layer coil, the stator core (1) is provided with 28 stator slots uniformly distributed along the circumferential direction, the first main winding (21) and the second main winding (22) respectively comprise 4-layer main winding coils, and the first auxiliary winding (31) and the second auxiliary winding (32) respectively comprise 3-layer auxiliary winding coils;
the stator slots include first to twenty-eighth stator slots (S1) to (S28) arranged in order at equal intervals in a circumferential direction; the first main winding (21) comprises a first layer main winding coil (m 1), a second layer main winding coil (m 2), a third layer main winding coil (m 3) and a fourth layer main winding coil (m 4), and the second main winding (22) comprises a fifth layer main winding coil (m 5), a sixth layer main winding coil (m 6), a seventh layer main winding coil (m 7) and an eighth layer main winding coil (m 8);
The first layer main winding coil (m 1) is embedded in the first stator slot (S1) and the fourteenth stator slot (S14), the second layer main winding coil (m 2) is embedded in the second stator slot (S2) and the thirteenth stator slot (S13), the third layer main winding coil (m 3) is embedded in the third stator slot (S3) and the twelfth stator slot (S12), the fourth layer main winding coil (m 4) is embedded in the fourth stator slot (S4) and the eleventh stator slot (S11), the fifth layer main winding coil (m 5) is embedded in the fifteenth stator slot (S15) and the twenty-eighth stator slot (S28), the sixth layer main winding coil (m 6) is embedded in the sixteenth stator slot (S16) and the twenty-seventh stator slot (S27), and the seventh layer main winding coil (m 7) is embedded in the seventeenth stator slot (S4) and the twenty-eighth stator slot (S17) and the twenty-eighth stator slot (S26) is embedded in the eighteenth stator slot (S8).
2. The stator according to claim 1, characterized in that the first auxiliary winding (31) comprises a first layer auxiliary winding coil (a 1), a second layer auxiliary winding coil (a 2) and a third layer auxiliary winding coil (a 3), the second auxiliary winding (32) comprises a fourth layer auxiliary winding coil (a 4), a fifth layer auxiliary winding coil (a 5) and a sixth layer auxiliary winding coil (a 6);
The first layer auxiliary winding coil (a 1) is embedded in a seventh stator slot (S7) and a twenty-second stator slot (S22), the second layer auxiliary winding coil (a 2) is embedded in a sixth stator slot (S6) and a twenty-third stator slot (S23), the third layer auxiliary winding coil (a 3) is embedded in a fifth stator slot (S5) and a twenty-fourth stator slot (S24), the fourth layer auxiliary winding coil (a 4) is embedded in an eighth stator slot (S8) and a twenty-first stator slot (S21), the fifth layer auxiliary winding coil (a 5) is embedded in a ninth stator slot (S9) and a twenty-first stator slot (S20), and the sixth layer auxiliary winding coil (a 6) is embedded in a tenth stator slot (S10) and a nineteenth stator slot (S19).
3. The stator according to claim 1, characterized in that the outer diameter D of the stator core (1) is: d is more than or equal to 120mm and less than or equal to 160mm.
4. A stator according to any one of claims 1-3, characterized in that the sum of the cross-sectional areas of the N1 layers of the main winding coils in the first main winding (21) or the second main winding (22) is larger than the sum of the cross-sectional areas of the N2 layers of the auxiliary winding coils in the first auxiliary winding (31) or the second auxiliary winding (32).
5. The stator of claim 4, wherein the cross section of the single-layer coil embedded in the stator slot is circular or square.
6. Stator according to claim 1, characterized in that the first main winding (21) and the second main winding (22) are symmetrically arranged about a main winding radial symmetry line (4), the first auxiliary winding (31) and the second auxiliary winding (32) are symmetrically arranged about an auxiliary winding radial symmetry line (5), the main winding radial symmetry line (4) being perpendicular to the auxiliary winding radial symmetry line (5).
7. An electric machine, characterized in that it comprises a stator according to any one of claims 1-6.
8. A compressor comprising the motor of claim 7.
9. A refrigeration apparatus comprising the compressor of claim 8.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN205945463U (en) * | 2016-08-31 | 2017-02-08 | 罗昌慧 | Single -phase capacitor starts asynchronous bipolar motor stator |
| CN207573120U (en) * | 2017-08-22 | 2018-07-03 | 广东美芝制冷设备有限公司 | Stator, motor, compressor and refrigeration equipment |
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| CN103201930B (en) * | 2010-10-19 | 2016-01-27 | 日产自动车株式会社 | Vehicle-mounted dynamo-electric machine system |
| CN102593978A (en) * | 2012-02-27 | 2012-07-18 | 山东大学 | Double-winding permanent-magnet brushless servo motor for servo press machine |
| CN106208435B (en) * | 2016-07-18 | 2020-05-01 | 广东美芝制冷设备有限公司 | Stator assembly, motor with same, compressor and refrigeration equipment |
| CN106208469A (en) * | 2016-08-19 | 2016-12-07 | 广东美芝制冷设备有限公司 | Compressor electric motor and the compressor with it |
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| CN205945463U (en) * | 2016-08-31 | 2017-02-08 | 罗昌慧 | Single -phase capacitor starts asynchronous bipolar motor stator |
| CN207573120U (en) * | 2017-08-22 | 2018-07-03 | 广东美芝制冷设备有限公司 | Stator, motor, compressor and refrigeration equipment |
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