CN112803633B - Motor stator and motor - Google Patents

Motor stator and motor Download PDF

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Publication number
CN112803633B
CN112803633B CN202110088075.XA CN202110088075A CN112803633B CN 112803633 B CN112803633 B CN 112803633B CN 202110088075 A CN202110088075 A CN 202110088075A CN 112803633 B CN112803633 B CN 112803633B
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China
Prior art keywords
stator
slot
slots
groups
motor
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CN202110088075.XA
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Chinese (zh)
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CN112803633A (en
Inventor
陈彬
廖克亮
黎永材
李世鹏
张健
王勇
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Gree Electric Appliances Inc of Zhuhai
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Gree Electric Appliances Inc of Zhuhai
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Priority to CN202110088075.XA priority Critical patent/CN112803633B/en
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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K1/00Details of the magnetic circuit
    • H02K1/06Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/12Stationary parts of the magnetic circuit
    • H02K1/16Stator cores with slots for windings
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K3/00Details of windings
    • H02K3/04Windings characterised by the conductor shape, form or construction, e.g. with bar conductors
    • H02K3/12Windings characterised by the conductor shape, form or construction, e.g. with bar conductors arranged in slots
    • H02K3/16Windings characterised by the conductor shape, form or construction, e.g. with bar conductors arranged in slots for auxiliary purposes, e.g. damping or commutating
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K2213/00Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
    • H02K2213/03Machines characterised by numerical values, ranges, mathematical expressions or similar information

Abstract

The invention provides a motor stator and a motor, wherein the motor stator comprises a stator core, N stator slots are constructed on the stator core, the number of pole pairs of a motor rotor is p, the N stator slots are sequentially divided into 6p stator slot groups along a first direction, each stator slot group comprises q stator slots which are sequentially arranged along the first direction, unilateral coils on the same side of a sinusoidal winding of a concentric winding mode are embedded in the q stator slots in each stator slot group in a one-to-one correspondence mode respectively, q is N/6p, the slot areas of the q stator slots in each stator slot group are increased or decreased progressively along the first direction, the largest stator slot in the q stator slots corresponds to the coil with the largest number of turns in the sinusoidal winding of the q groups, the first direction is the circumferential direction of the stator core, and q is not less than 2. According to the invention, the slot area of each stator slot in the same stator slot group is matched with the number of turns of the embedded coil of the concentric winding, so that the slot fullness rate is ensured, and the material utilization rate is improved.

Description

Motor stator and motor
Technical Field
The invention belongs to the technical field of motor manufacturing, and particularly relates to a motor stator and a motor.
Background
With the technological progress and the improvement of living standard of people, the requirements of various devices on motor noise are more and more strict. Noise limits in various national standards are tightened year by year, and people put higher demands on the noise of industrial motors besides application occasions of some living electric appliances such as air conditioners and fans.
The control of the motor noise can be realized by reducing harmonic waves, weakening torque pulsation and the like, the odd-number harmonic waves of the motor can be effectively reduced by adopting a sine winding mode in the prior art, and the sine degree of counter electromotive force is improved.
Disclosure of Invention
Therefore, the technical problem to be solved by the invention is to provide a stator and a motor of the motor, wherein the slot area of each stator slot in the same stator slot group is matched with the number of turns of the embedded coil of the concentric winding, so that the slot fullness rate is ensured, and the material utilization rate is improved.
In order to solve the above problems, the present invention provides a motor stator, including a stator core, where the stator core is configured with N stator slots, a number of pole pairs of a motor rotor matching with the motor stator is p, the N stator slots are sequentially divided into 6p stator slot groups along a first direction, each stator slot group includes q stator slots sequentially arranged along the first direction, q groups of same-side single-side coils of a sinusoidal winding adopting a concentric winding manner are respectively embedded in the q stator slots in each stator slot group in a one-to-one correspondence manner, q is N/6p, a slot area of the q stator slots in each stator slot group increases or decreases progressively along the first direction, and a stator slot with the largest area among the q stator slots corresponds to a coil with the largest number of turns in the q groups of sinusoidal windings, where the first direction is a circumferential direction of the stator core, q is more than or equal to 2.
Preferably, the q stator slots in each stator slot group have a slot area S in sequence along the first direction1、S2、···、Si、Si+1、···SqThe number of coil turns of q groups of sinusoidal windings which are correspondingly embedded in q stator slots one by one is W1、W2、···、Wi、Wi+1、···Wq,S1/W1=S2/W2=···=Si/Wi=Si+1/Wi+1=···=Sq/Wq,W1<W2<···<Wi<Wi+1<···<Wq
Preferably, in the first direction, the stator slot spans of any two adjacent stator slots of the q stator slots in each stator slot group are respectively alphai、αi+1,αi≠αi+1
Preferably, 0.15w ≦ αii+1≤0.25w,w=360°/N。
Preferably, 1.1. ltoreq.Si+1/Si≤1.6。
Preferably, on any radial cross section of the stator core, the slot bottoms of the N stator slots are on the same slot bottom circle, and the slot bottom circle is concentric with the center of the stator core.
Preferably, in any radial cross section of the stator core, the stator core has a first radial axis passing through the center of the stator core, adjacent 3p of the 6p stator slot groups on the stator core are located on a first side of the radial axis, the remaining adjacent 3p stator slot groups are located on a second side of the radial axis, and the 3p stator slot groups on the first side and the 3p stator slot groups on the second side are symmetrical about the first radial axis.
Preferably, on any radial cross section of the stator core, a second radial axis passing through the center of the stator core is provided between any two adjacent stator slot groups in the 6p stator slot groups, and any two adjacent stator slot groups are symmetrical with respect to the corresponding second radial axis.
Preferably, the N stator slots are formed by N stator teeth at intervals along the circumferential direction of the stator core, and the circumferential tooth widths of the N stator teeth are all equal.
The invention also provides a motor which comprises the motor stator.
According to the motor stator and the motor, on one hand, the sine winding is embedded in the stator slot of the motor stator, so that odd-number harmonics of the motor are effectively reduced, and the sine degree of a counter potential is improved; on the other hand, the slot areas of the q stator slots in the same stator slot group are respectively matched and corresponding to the sinusoidal windings, and the number distribution of the turns of the sinusoidal windings is sinusoidal, so that the slot areas of the stator slots are sinusoidal, the slot filling rate is ensured, and the material utilization rate is improved.
Drawings
Fig. 1 is a schematic structural view of a radial cross section of a stator of an electric machine according to an embodiment of the present invention;
fig. 2 is a schematic view of a radial cross section of a stator of an electric machine according to another embodiment of the present invention;
FIG. 3 is a schematic view of a stator slot span in a stator of an electric machine according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a coil winding using concentric windings in accordance with aspects of the present invention;
FIG. 5 is a graph of the effect of stator slot area on ratio 3 harmonic content;
FIG. 6 shows the case of using Si+1/SiThe motor 1.4 times is compared with the conventional motor (S)i+1/Si1) histogram of reduction of harmonics;
FIG. 7 is a graph of the effect of stator slot area on ratio 5 harmonic content;
FIG. 8 shows the case of using Si+1/Si1.15 times motor and conventional motor (S)i+1/Si1) histogram of reduction of harmonics;
FIG. 9 is a graph of the effect of stator slot span versus torque ripple for a slot offset angle defined in the present invention, i.e., for any two adjacent stator slots in each stator slot group;
fig. 10 is a schematic diagram comparing output torque waveforms of a motor adopting the technical scheme of the invention and a conventional motor.
The reference numerals are represented as:
1. a stator core; 11. a stator slot; 12. stator teeth; 13. a first stator slot group; 14. a second set of stator slots.
Detailed Description
With reference to fig. 1 to 10 in combination, according to an embodiment of the present invention, there is provided a motor stator, including a stator core 1, where the stator core 1 is configured with N stator slots 11, a number of pole pairs of a motor rotor matching with the motor stator is p, the N stator slots 11 are sequentially divided into 6p stator slot groups along a first direction, each stator slot group includes q stator slots 11 sequentially arranged along the first direction, same-side single-side coils of q groups of sinusoidal windings (not shown in the figure) adopting a concentric winding manner are respectively embedded in q stator slots 11 in each stator slot group in a one-to-one correspondence manner, q is N/6p, slot areas of q stator slots 11 in each stator slot group increase or decrease along the first direction, and a stator slot 11 with a largest area among the q stator slots 11 corresponds to one coil with a largest coil turn number in the q groups of sinusoidal windings, wherein, the first direction is the circumferential direction of the stator core 1, and q is more than or equal to 2. In the technical scheme, on one hand, a sine winding is embedded in a stator slot of the motor stator, so that odd-number subharmonics of the motor are effectively reduced, and the sine degree of counter electromotive force is improved; on the other hand, the slot areas of the q stator slots in the same stator slot group are respectively matched and corresponding to the sinusoidal windings, and the number distribution of the turns of the sinusoidal windings is sinusoidal, so that the slot areas of the stator slots are sinusoidal, the slot filling rate is ensured, and the material utilization rate is improved.
In some embodiments, referring to fig. 1, in any radial cross section of the stator core 1, the stator core 1 has a first radial axis passing through a center of the stator core 1, adjacent 3p of the 6p stator slot groups on the stator core 1 are on a first side of the radial axis, the remaining adjacent 3p are on a second side of the radial axis, and the 3p stator slot groups on the first side are symmetrical to the 3p stator slot groups on the second side about the first radial axis.
The sinusoidal winding in the present invention is formed by a concentric winding method, specifically, as shown in fig. 4, specifically, where q is 3 as an example, W1 represents the innermost coil turn number for the same stator slot group, and W2 and W3 represent the second coil turn number and the third coil turn number of the concentric winding along the inner side and the outer side, and it can be understood that W1 > W2 > W3, and correspondingly, L1, L2, and L3 of the innermost coil length, L1 < L2 < L3.
Further referring to fig. 1, fig. 1 shows a stator core with 36 stator slots, which has 12 stator slot groups, each stator slot group has 3 stator slots 11 with different slot areas, the first stator slot group 13 has left, middle and right stator slots (shown in the figure) arranged along one side of the first direction (clockwise in the figure), a fourth stator slot group (shown by right oblique lines in fig. 1) that spans two stator slot groups (a second stator slot group 14, a third stator slot group) in the first direction corresponds to the first stator slot group 11, and the left side of the innermost coil at this time is fitted into the right stator slot, the right side edge of the corresponding innermost coil is embedded in the left stator slot in the fourth stator slot group, the right stator slot group 13 has the same area as the left stator slot group in the fourth stator slot group.
In some embodiments, referring to fig. 2, on any radial cross section of the stator core 1, any two adjacent stator slot groups of 6p stator slot groups have a second radial axis passing through the center of the stator core 1, and any two adjacent stator slot groups are symmetric with respect to their corresponding second radial axes.
In view of the specific formation of the concentric winding method of the present invention, as further shown in fig. 2, fig. 2 shows a 36-slot stator core, which has 12 stator slot groups, each having 3 stator slots 11 with different slot areas, the first stator slot group 13 has left, middle and right stator slots (shown in the figure) arranged along one side of the first direction (clockwise direction of the figure), and the second stator slot group 12 is symmetrical to the first stator slot group 11, the slot areas of the stator slots in the respective slot groups increase or decrease in completely opposite directions, the fourth stator slot group (right oblique line in fig. 1) corresponding to the first stator slot group 11 crosses over two stator slot groups (second and third stator slot groups) along the first direction, and the left side of the innermost coil is embedded in the right stator slot, the right side edge of the corresponding innermost coil is embedded in the left stator slot in the fourth stator slot group, and the area of the right stator slot in the first stator slot group 13 is the same as that of the left stator slot in the fourth stator slot group.
Preferably, the q stator slots 11 in each stator slot group have a slot area S in the order of the first direction1、S2、···、Si、Si+1、···SqThe number of turns of the q groups of sinusoidal windings correspondingly embedded in the q stator slots 11 one by one is W1、W2、···、Wi、Wi+1、···Wq,S1/W1=S2/W2=···=Si/Wi=Si+1/Wi+1=···=Sq/Wq,W1<W2<···<Wi<Wi+1<···<Wq
Preferably, in the first direction, the stator slot spans of any two adjacent stator slots 11 in the q stator slots 11 in each stator slot group are respectively alphai、αi+1,αi≠αi+1And the central angle of the notches of the two adjacent stator slots 11 corresponding to the circle center of the stator core 1 is the stator slot span, so that the unequal distribution of the stator notches around the central hole of the stator core is realized, and the torque pulsation is favorably reduced. Further 0.15w ≦ alphaii+1W is 360 °/N ≦ 0.25w, as can be seen from fig. 9, the torque ripple is lowest when the stator slot span is within the aforementioned range. It will be further appreciated that any two adjacent stator slot groups of the 6p stator slot groups may have a spacing θ, where θ is 360 °/6 p.
Referring to FIGS. 7 to 8, for the 5 th harmonic, when 1.1 ≦ Si+1/SiLess than or equal to 1.2, can effectively reduce 5-th harmonic, and the fundamental content reaches 92.3 percent; referring to FIGS. 5 to 6, for the 3 rd harmonic, when 1.2 ≦ Si+1/SiLess than or equal to 1.6, 3-order harmonic waves can be effectively reduced, and the fundamental wave content reaches 93.1 percent, so that S is less than or equal to 1.1i+1/SiWhen the harmonic content is less than or equal to 1.6, the content of 3 th harmonic and 5 th harmonic can be obviously reduced, and the content of the fundamental wave can be improved.
Preferably, on any radial cross section of the stator core 1, the groove bottoms of the N stator grooves 11 are located on the same groove bottom circle (DY shown in the figure), and the groove bottom circle is concentric with the circle center of the stator core 1, so that a uniform magnetic circuit of the whole motor stator can be ensured.
Preferably, the N stator slots 11 are formed by N stator teeth 12 at intervals along the circumferential direction of the stator core 1, and the circumferential tooth widths (denoted by t in the drawing) of the N stator teeth 12 are all equal, so that the magnetic circuits of the stator teeth are equivalent, advanced saturation of some teeth with narrower tooth widths is avoided, the material utilization rate of the motor is improved (namely the same material can run to a larger load), and the tooth widths are the same to avoid over-high local magnetic density, thereby avoiding uneven magnetic circuits along the circumference of the stator and generating vibration and noise.
As shown in fig. 10, through simulation verification, the output torque waveform of the motor using the motor stator of the present invention has better sine degree and significantly reduced torque ripple.
The invention also provides a motor, in particular to a three-phase concentric distributed winding motor, which comprises the motor stator.
It is readily understood by a person skilled in the art that the advantageous ways described above can be freely combined, superimposed without conflict.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention. The above is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the technical principle of the present invention, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims (7)

1. The motor stator is characterized by comprising a stator core (1), wherein N stator slots (11) are constructed on the stator core (1), the number of pole pairs of a motor rotor matched with the motor stator is p, N stator slots (11) are sequentially divided into 6p stator slot groups along a first direction, each stator slot group comprises q stator slots (11) which are sequentially arranged along the first direction, the q stator slot groups adopt a concentric winding mode, one-side single-side coils of a sine winding on the same side of the sine winding are respectively embedded in the q stator slots (11) in each stator slot group in a one-to-one correspondence mode, and q is N or N ion beam6p, the slot areas of q stator slots (11) in each stator slot group are increased or decreased progressively along the first direction, and the stator slot (11) with the largest area in the q stator slots (11) corresponds to a coil with the largest coil turn number in q groups of sinusoidal windings, wherein the first direction is the circumferential direction of the stator core (1), and q is more than or equal to 2; the slot area of q stator slots (11) in each stator slot group is S in sequence along the first direction1、S2、···、Si、Si+1、···SqThe number of coil turns of q groups of sinusoidal windings which are correspondingly embedded in q stator slots (11) one by one is W1、W2、···、Wi、Wi+1、···Wq,S1/W1=S2/W2=···=Si/Wi=Si+1/Wi+1=···=Sq/Wq,W1<W2<···<Wi<Wi+1<···<Wq(ii) a In the first direction, the stator slot spans of any two adjacent stator slots (11) in the q stator slots (11) in each stator slot group are respectively alphai、αi+1,αi≠αi+1;0.15w≤αii+1≤0.25w,w=360°/N。
2. The stator for an electric machine of claim 1, wherein 1.1 ≦ Si+1/Si≤1.6。
3. The stator according to claim 1, characterized in that the slot bottoms of the N stator slots (11) are on the same slot bottom circle concentric with the center of the stator core (1) in any radial cross section of the stator core (1).
4. A stator for an electric machine according to claim 1, characterized in that, in any radial cross section of the stator core (1), the stator core (1) has a first radial axis passing through its centre, that adjacent 3p of the 6p groups of stator slots present on the stator core (1) are on a first side of the radial axis, that the remaining adjacent 3p are on a second side of the radial axis, and that the 3p groups of stator slots in the first side are symmetrical to the 3p groups of stator slots in the second side about the first radial axis.
5. A stator for an electric machine according to claim 1, characterized in that in any radial cross-section of the stator core (1), any two adjacent stator slot groups of 6p stator slot groups have a second radial axis passing through the center of the stator core (1), and any two adjacent stator slot groups are symmetrical with respect to their corresponding second radial axes.
6. The stator according to claim 1, wherein the N stator slots (11) are formed by N stator teeth (12) at intervals along the circumferential direction of the stator core (1), and the circumferential widths of the N stator teeth (12) are all equal.
7. An electrical machine comprising an electrical machine stator, characterized in that the electrical machine stator is according to any one of claims 1 to 6.
CN202110088075.XA 2021-01-22 2021-01-22 Motor stator and motor Active CN112803633B (en)

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Application Number Priority Date Filing Date Title
CN202110088075.XA CN112803633B (en) 2021-01-22 2021-01-22 Motor stator and motor

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Application Number Priority Date Filing Date Title
CN202110088075.XA CN112803633B (en) 2021-01-22 2021-01-22 Motor stator and motor

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CN112803633B true CN112803633B (en) 2022-04-22

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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101984540A (en) * 2010-12-01 2011-03-09 泰豪科技股份有限公司 Mixed concentric single and two-layer winding for servo permanent magnet synchronous motor

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5460529B2 (en) * 2010-09-03 2014-04-02 三菱電機株式会社 Rotating electric machine stator
CN202651911U (en) * 2012-05-29 2013-01-02 浙江力扬压缩机有限公司 Stator punching sheet of compressor motor
CN206834871U (en) * 2017-05-19 2018-01-02 浙江创新电机有限公司 A kind of low harmonic winding
CN210927227U (en) * 2019-09-23 2020-07-03 珠海凯邦电机制造有限公司 Stator punching sheet
CN211151637U (en) * 2020-02-25 2020-07-31 威海正华电机有限公司 Novel motor stator
CN111682665B (en) * 2020-06-19 2022-04-08 山西电机制造有限公司 IE5 three-phase asynchronous motor based on unequal-slot punching sheets of stator and cast-aluminum rotor

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101984540A (en) * 2010-12-01 2011-03-09 泰豪科技股份有限公司 Mixed concentric single and two-layer winding for servo permanent magnet synchronous motor

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