CN212660022U - Double-winding stator and motor - Google Patents
Double-winding stator and motor Download PDFInfo
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- CN212660022U CN212660022U CN202021358760.7U CN202021358760U CN212660022U CN 212660022 U CN212660022 U CN 212660022U CN 202021358760 U CN202021358760 U CN 202021358760U CN 212660022 U CN212660022 U CN 212660022U
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Abstract
The utility model provides a double-winding stator and a motor, wherein the double-winding stator comprises a stator core, a first set of winding and a second set of winding, and the first set of winding and the second set of winding are respectively provided with an independent external terminal; the stator core comprises k stator teeth which are uniformly distributed along the circumferential direction, and k is an integer which is greater than or equal to 6; the first set of windings is wound on the k stator teeth, the second set of windings is wound on the i stator teeth, and i is an integer smaller than k and larger than zero. The embodiment of the utility model provides a coil number through making redundant winding is less than the coil number of main winding, can be when realizing two redundancy redundancies, accomplishes the biggest with the coil number of the first set of winding of normal function for the power density of motor is higher.
Description
Technical Field
The embodiment of the utility model provides a relate to the motor field, more specifically say, relate to a duplex winding stator and motor.
Background
With the popularization of low-carbon emission and the traditional energy consumption, the field of electric automobiles develops rapidly, and higher requirements are put forward on the safety and the reliability of driving. The electric motor is used as a core component of an electric automobile, and the development of improving the operation reliability by using a double-winding redundant motor is in the trend.
In the existing double-winding motor system, a single set of armature winding of the traditional motor is generally changed into two sets of armature windings independently powered; under normal working conditions, the first set of armature windings outputs power or the two sets of armature windings output power simultaneously; when the first set of armature winding has a fault, the second set of armature winding is switched to work independently to ensure continuous power output.
In the existing double-winding motor, a first set of windings are arranged according to a conventional symmetrical double-layer distributed winding, and a second set of windings are arranged according to a conventional symmetrical double-layer winding at the same slot position, namely, each slot of a stator has four layers of windings in total.
In the double-winding motor, the connection form and the spatial position of the two sets of windings are completely the same, so that the two sets of windings share a magnetic circuit, the mutual inductance is large, and the decoupling control algorithm difficulty is large. And when two sets of windings are double-layer windings, one slot contains four layers of windings, and the windings of each layer need insulation materials, so that the using amount of the insulation materials is increased, and accordingly, the slot fullness rate is reduced. In addition, the four-layer winding has the problems of increased difficulty of coil assembly, increased coil assembly time and reduced manufacturing efficiency.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides a to above-mentioned duplex winding motor lead to mutual inductance great, the decoupling control algorithm degree of difficulty is great because of connection form and position space are the same completely, lead to the full rate of groove to descend because of increasing the insulating material quantity to and the degree of difficulty increase of inserting winding, the time of inserting winding increase, the problem that manufacturing efficiency reduces, provide a new duplex winding stator and motor.
The technical solution to solve the above technical problem of the present invention is to provide a double-winding stator, which includes a stator core, a first set of windings and a second set of windings, wherein the first set of windings and the second set of windings have independent external terminals respectively; the stator core comprises k stator teeth which are uniformly distributed along the circumferential direction, and k is an integer which is greater than or equal to 6; the first set of windings is wound on the k stator teeth, the second set of windings is wound on the i stator teeth, and i is an integer smaller than k and larger than zero.
Preferably, the stator core includes a plurality of core units, each of the core units includes a yoke portion and at least one stator tooth located in the yoke portion, the plurality of core units are arranged in a circumferential direction in a manner that the yoke portions are connected, and the stator tooth is located inside the circumference.
Preferably, k is an even number, i is k/2, and the stator teeth wound with the second set of windings are uniformly distributed in the circumferential direction of the stator core.
Preferably, the first set of windings comprises k coils, and the k coils of the first set of windings are respectively wound on the k stator teeth in an insulated manner from the stator teeth;
the second set of windings comprises i coils, the i coils of the second set of windings are wound outside the i coils of the first set of windings respectively, and the coils of the second set of windings are separated from the coils of the first set of windings through insulating materials.
Preferably, the second set of windings comprises i coils, and the i coils of the second set of windings are respectively wound on the i stator teeth in a manner of being insulated from the stator teeth;
the first set of windings comprises k coils, the i coils in the first set of windings are respectively wound on the outer sides of the i coils in the second set of windings, the coils of the first set of windings and the coils of the second set of windings are separated by insulating materials, and the (k-i) coils in the first set of windings are respectively wound on the rest (k-i) stator teeth in an insulating mode with the stator teeth.
Preferably, k is an integer multiple of 6; the first set of windings comprise a first U-phase winding, a first V-phase winding and a first W-phase winding, and the equivalent phase difference of the first U-phase winding, the first V-phase winding and the first W-phase winding on the stator teeth is 120 degrees in sequence;
the i is an integral multiple of 3, the second set of windings comprises a second U-phase winding, a second V-phase winding and a second W-phase winding, and the equivalent phase differences of the second U-phase winding, the second V-phase winding and the second W-phase winding on the stator teeth are 120 degrees in sequence.
Preferably, said k is equal to 12;
the first U-phase winding comprises four first U-phase coils, and the four first U-phase coils are respectively wound on the four stator teeth in a serial or parallel mode; the first V-phase winding comprises four first V-phase coils, and the four first V-phase coils are respectively wound on the four stator teeth in a serial or parallel mode; the first W-phase winding comprises four first W-phase coils, and the four first W-phase coils are respectively wound on the four stator teeth in a serial or parallel mode;
the first U-phase coil, the first V-phase coil and the first W-phase coil have the same number of turns.
Preferably, said i is equal to 6;
the second U-phase winding comprises two second U-phase coils, and the two second U-phase coils are respectively wound on the two stator teeth in a serial or parallel mode; the second V-phase winding comprises two second V-phase coils, and the two second V-phase coils are respectively wound on the two stator teeth in a serial or parallel mode; the second W-phase winding comprises two second W-phase coils, and the two second W-phase coils are respectively wound on the two stator teeth in a serial or parallel mode;
and the second U-phase coil, the second V-phase coil and the second W-phase coil have the same number of turns.
The embodiment of the utility model provides a still provide a motor, including rotor, two inverters and the duplex winding stator as above; the output terminals of the two inverters are connected to the first set of windings and the second set of windings, respectively.
Preferably, the motor further comprises a switching unit, and the switching unit is respectively connected with the two inverters and used for switching the working states of the two inverters.
Implement the utility model discloses duplex winding stator and motor has following beneficial effect: the number of the coils of the second set of winding (namely, the redundant winding) is smaller than that of the coils of the first set of winding (namely, the main winding), the first set of winding is wound on all stator teeth of the stator core, and the second set of winding is wound on part of stator teeth of the stator core, so that the number of the coils of the first set of winding which normally operates is the largest while dual-redundancy is realized, and the power density of the motor is higher.
Drawings
Fig. 1 is a schematic structural diagram of a double-winding stator provided in an embodiment of the present invention;
fig. 2 is a schematic structural diagram of an iron core unit in a double-winding stator provided by an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a first set of windings and a second set of windings wound around an iron core unit in a double-winding stator provided by an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a dual-winding stator according to another embodiment of the present invention, in which a first set of windings and a second set of windings are wound around an iron core unit;
fig. 5 is a schematic diagram illustrating the first set of windings of a two-winding stator according to an embodiment of the present invention;
fig. 6 is a schematic diagram illustrating the expansion of the second set of windings in the double-winding stator according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of a rotor in an electric machine according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown in fig. 1, it is a schematic diagram of a dual-winding stator provided by the embodiment of the present invention, the dual-winding stator can be applied to a dual-redundancy redundant motor, which can ensure continuous power output of the motor. The double-winding stator of the embodiment comprises a stator core 10, a first set of windings 11 and a second set of windings 12, wherein the first set of windings 11 and the second set of windings 12 are respectively provided with an independent external terminal, so that the first set of windings can be connected with a first inverter through the external terminal, and the second set of windings 12 can be connected with a second inverter through the external terminal, so that respective driving control of the two sets of windings is realized, for example, when the first set of windings 11 is in fault and even is burnt out, the second set of windings 12 is immediately switched into work, and a double-redundancy fault-tolerant function is realized.
The stator core 10 may be formed by punching and stacking silicon steel sheets, and the stator core 10 includes k stator teeth uniformly distributed along a circumferential direction, where k is an integer greater than or equal to 6. The first set of windings 11 is wound on the k stator teeth, that is, the first set of windings 11 is wound on all the stator teeth; the second set of windings 12 is wound around i stator teeth, i is an integer smaller than k and larger than zero, i.e. the second set of windings 12 is wound around part of the stator teeth of the stator core.
Through the mode, the number of the coils contained in the first set of winding 11 serving as the main winding is larger than that of the coils contained in the second set of winding 12 serving as the redundant winding, and partial coils in the two sets of windings are located in the same stator slot (formed by the space between adjacent stator teeth). Particularly, the stator teeth wound with the second set of windings 12 are uniformly distributed on the stator core 10, so that the two sets of windings are uniformly distributed in space and electricity, the influence of unilateral magnetic tension is avoided, and the phenomenon of eccentricity is avoided in the rotating process of the rotor.
According to the double-winding stator, the number of the coils of the second set of winding (namely, the redundant winding) is smaller than that of the coils of the first set of winding (namely, the main winding), the first set of winding is wound on all stator teeth of the stator core, and the second set of winding is wound on part of stator teeth of the stator core, so that the number of the coils of the first set of winding which normally operates is the largest while double-redundancy is realized, and the power density of the motor is higher. And the two sets of windings are small in electrical coupling and mutual inductance, so that decoupling control is easy to realize.
In an embodiment of the present invention, the stator core 10 may have a splicing structure for reducing the winding difficulty. As shown in fig. 2, the stator core 10 includes a plurality of core units, each of which includes a yoke portion 101 and at least one stator tooth 102 connected to the yoke portion 101. The plurality of core units are arranged in the circumferential direction so that the yoke portions 101 are connected (i.e., the plurality of core units are connected in a ring shape by the yoke portions 101), and the stator teeth 102 are located inside the circumference (i.e., a ring formed by splicing the yoke portions 101).
By adopting the split stator core 10, the winding difficulty is reduced, and simultaneously, the coil wires in the first set of winding 11 and the second set of winding 12 are arranged more uniformly and neatly, so that the utilization rate of the stator slot is improved.
Preferably, the stator core 10 includes k core units, and the yoke portion 101 of each core unit has one stator tooth 102. Compared with the scheme that a plurality of stator teeth 102 are arranged on the same iron core unit, the structure is more beneficial to winding.
In another embodiment of the present invention, as shown in fig. 3, k is an even number, i is k/2, and the stator teeth around which the second set of windings 12 are wound are uniformly distributed in the circumferential direction of the stator core 10, i.e., one coil of the second set of windings 12 is wound every other stator tooth.
Specifically, the first set of windings 11 includes k coils, and the k coils of the first set of windings 11 are respectively wound on the k stator teeth 102 in an insulated manner from the stator teeth 102, that is, each coil of the first set of windings 11 is wound on one stator tooth 102. Specifically, an insulating layer 105 of insulating material may be added between the coils of the first set of windings 11 and the stator teeth 102 to achieve insulation. The second set of windings 12 includes i coils, and the i coils of the second set of windings 12 are respectively wound outside the i coils of the first set of windings 11, i.e. the coils of the second set of windings 12 are wound on the stator core 10 with one stator tooth 102 therebetween. Each coil of the second set of windings 12 is separated from a corresponding coil of the first set of windings 11 by an insulating material 106 to provide insulation between the first set of windings 11 and the second set of windings 12.
After the first set of windings 11 and the second set of windings 12 are wound, the stator slots of the stator core 10 may be encapsulated by potting compound for heat dissipation and insulation.
Of course, in practical applications, i may also be k/3 or other values, so that the number of coils of the second set of windings 12 and the number of wound stator teeth may vary accordingly.
In a further embodiment of the present invention, as shown in fig. 4, the i coils of the second set of windings 12 are wound on the i stator teeth 102 in such a manner as to be insulated from the stator teeth 102, respectively; the first set of windings includes k coils, i coils of the first set of windings 11 are respectively wound outside i coils of the second set of windings 12, the coils of the first set of windings 11 are separated from the coils of the second set of windings 12 by an insulating material, and the other (k-i) coils of the first set of windings 11 are respectively wound on the remaining (k-i) stator teeth 102 (i.e., on the stator teeth 102 on which the second set of windings 12 are not wound) in an insulating manner from the stator teeth 102.
Similarly, after the first set of windings 11 and the second set of windings 12 are wound, the stator slots of the stator core 10 may be encapsulated by the potting compound. Compared with the embodiment shown in fig. 3, since the first set of windings 11 directly contacts with the potting adhesive, the heat can be dissipated quickly, i.e., the first set of windings 11 in this embodiment dissipates heat relatively well.
The double-winding stator can be applied to a three-phase motor, and accordingly k is an integral multiple of 6. At this time, as shown in fig. 5, the first set of windings 11 includes a first U-phase winding U1, a first V-phase winding V1, and a first W-phase winding W1, and the equivalent phase difference of the first U-phase winding U1, the first V-phase winding V1, and the first W-phase winding W1 on the stator teeth of the stator core 10 is 120 ° in this order. The first U-phase winding U1, the first V-phase winding V1 and the first W-phase winding W1 of the first set of windings 11 may be connected in a Y-shaped or delta-shaped manner.
Accordingly, i is an integral multiple of 3, and as shown in fig. 6, the second set of windings 12 includes a second U-phase winding U2, a second V-phase winding V2, and a second W-phase winding W2, and the equivalent phase difference of the second U-phase winding U2, the second V-phase winding V2, and the second W-phase winding W2 on the stator teeth of the stator core is sequentially 120 °. The second U-phase winding U2, the second V-phase winding V2 and the second W-phase winding W2 of the second set of windings 12 may be connected in a Y-shaped or delta-shaped manner.
The double winding stator described above is applicable to a ten-pole twelve-slot (12s/10p) three-phase machine, i.e. k is equal to 12. At the moment, the first U-phase winding U1 comprises four first U-phase coils U1-1, U1-2, U1-3 and U1-4, and the four first U-phase coils U1-1, U1-2, U1-3 and U1-4 are respectively wound on the four stator teeth in a series or parallel mode; the first V-phase winding V1 comprises four first V-phase coils V1-1, V1-2, V1-3 and V1-4, and the four first V-phase coils V1-1, V1-2, V1-3 and V1-4 are respectively wound on the four stator teeth in a series or parallel mode; the first W-phase winding W1 comprises four first W-phase coils W1-1, W1-2, W1-3 and W1-4, and the four first W-phase coils W1-1, W1-2, W1-3 and W1-4 are wound on the four stator teeth respectively in a series or parallel mode. And the number of turns of the first U-phase coil U1-1, U1-2, U1-3, U1-4, first V-phase coil V1-1, V1-2, V1-3, V1-4, first W-phase coil W1-1, W1-2, W1-3 and W1-4 is the same.
Correspondingly, i is equal to 6, the second U-phase winding U2 comprises two second U-phase coils U2-1 and U2-2, and the two second U-phase coils U2-1 and U2-2 are wound on the two stator teeth respectively in a serial or parallel mode; the second V-phase winding V2 comprises two second V-phase coils V2-1 and V2-2, and the two second V-phase coils V2-1 and V2-2 are respectively wound on two stator teeth in a series or parallel mode; the second W-phase winding W2 comprises two second W-phase coils W2-1 and W2-2, and the two second W-phase coils W2-1 and W2-2 are wound on the two stator teeth respectively in a serial or parallel mode; and the numbers of turns of the second U-phase coil U2-1, the second U2-2, the second V-phase coil V2-1, the second V2-2, the second W-phase coil W2-1 and the second W2-2 are the same.
Specifically, the number of turns of each coil of the two sets of windings may be determined according to the power distribution relationship of the first set of windings 11 and the second set of windings 12.
The utility model also provides a motor, this motor include as shown in figure 7 rotor, two inverters and foretell duplex winding stator, wherein the rotor includes permanent magnet 21, folds rotor core 20 and pivot 22 that the pressure formed by the silicon steel sheet. The two inverters are respectively connected with the external terminal of the first set of winding and the external terminal of the second set of winding, so that the first set of winding and the second set of winding on the double-winding stator are independently powered, and a double-redundancy fault-tolerant function is realized.
Specifically, the motor may further include a switching unit connected to the two inverters, respectively, and configured to switch operating states of the two inverters. For example, when the first set of windings is failed or even burnt out, the switching unit stops the output of the inverter connected with the first power supply unit and enables the inverter connected with the second power supply unit to output a driving signal to the second set of windings, so that the second set of windings are switched into operation immediately.
In the above-mentioned motor, the rotor may adopt various magnetic circuit structures, for example, the rotor may be a surface-mounted rotor, a built-in radial rotor (I type), a built-in tangential rotor (Spoke type), a multi-layer magnetic steel rotor, a mixed magnetic circuit rotor ("V", "V + I", etc.), or a Halbach array rotor, etc.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A double-winding stator is characterized by comprising a stator core, a first set of windings and a second set of windings, wherein the first set of windings and the second set of windings are respectively provided with an independent external terminal; the stator core comprises k stator teeth which are uniformly distributed along the circumferential direction, and k is an integer which is greater than or equal to 6; the first set of windings is wound on the k stator teeth, the second set of windings is wound on the i stator teeth, and i is an integer smaller than k and larger than zero.
2. The double-winding stator according to claim 1, wherein the stator core comprises a plurality of core units, each of the core units comprises a yoke portion and at least one stator tooth located at the yoke portion, the plurality of core units are arranged in a circumferential direction in such a manner that the yoke portions are connected, and the stator teeth are located inside the circumference.
3. The double-winding stator according to claim 1, wherein k is an even number, i is k/2, and the stator teeth wound with the second set of windings are uniformly distributed in the circumferential direction of the stator core.
4. The dual winding stator of claim 1, wherein the first set of windings comprises k coils, and the k coils of the first set of windings are wound around the k stator teeth, respectively, in an insulated manner from the stator teeth;
the second set of windings comprises i coils, the i coils of the second set of windings are wound outside the i coils of the first set of windings respectively, and the coils of the second set of windings are separated from the coils of the first set of windings through insulating materials.
5. The dual winding stator of claim 1, wherein the second set of windings includes i coils, and the i coils of the second set of windings are respectively wound on the i stator teeth in an insulated manner from the stator teeth;
the first set of windings comprises k coils, the i coils in the first set of windings are respectively wound on the outer sides of the i coils in the second set of windings, the coils of the first set of windings and the coils of the second set of windings are separated by insulating materials, and the (k-i) coils in the first set of windings are respectively wound on the rest (k-i) stator teeth in an insulating mode with the stator teeth.
6. A twin winding stator as defined in any one of claims 1-5 wherein k is an integer multiple of 6; the first set of windings comprise a first U-phase winding, a first V-phase winding and a first W-phase winding, and the equivalent phase difference of the first U-phase winding, the first V-phase winding and the first W-phase winding on the stator teeth is 120 degrees in sequence;
the i is an integral multiple of 3, the second set of windings comprises a second U-phase winding, a second V-phase winding and a second W-phase winding, and the equivalent phase differences of the second U-phase winding, the second V-phase winding and the second W-phase winding on the stator teeth are 120 degrees in sequence.
7. The double-winding stator of claim 6, wherein k is equal to 12;
the first U-phase winding comprises four first U-phase coils, and the four first U-phase coils are respectively wound on the four stator teeth in a serial or parallel mode; the first V-phase winding comprises four first V-phase coils, and the four first V-phase coils are respectively wound on the four stator teeth in a serial or parallel mode; the first W-phase winding comprises four first W-phase coils, and the four first W-phase coils are respectively wound on the four stator teeth in a serial or parallel mode;
the first U-phase coil, the first V-phase coil and the first W-phase coil have the same number of turns.
8. The double-winding stator according to claim 6, wherein i is equal to 6;
the second U-phase winding comprises two second U-phase coils, and the two second U-phase coils are respectively wound on the two stator teeth in a serial or parallel mode; the second V-phase winding comprises two second V-phase coils, and the two second V-phase coils are respectively wound on the two stator teeth in a serial or parallel mode; the second W-phase winding comprises two second W-phase coils, and the two second W-phase coils are respectively wound on the two stator teeth in a serial or parallel mode;
and the second U-phase coil, the second V-phase coil and the second W-phase coil have the same number of turns.
9. An electrical machine comprising a rotor, two inverters and a double-winding stator according to any one of claims 1-8; the output terminals of the two inverters are connected to the first set of windings and the second set of windings, respectively.
10. The electric machine according to claim 9, further comprising a switching unit connected to the two inverters, respectively, for switching operating states of the two inverters.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021358760.7U CN212660022U (en) | 2020-07-10 | 2020-07-10 | Double-winding stator and motor |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021358760.7U CN212660022U (en) | 2020-07-10 | 2020-07-10 | Double-winding stator and motor |
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| CN212660022U true CN212660022U (en) | 2021-03-05 |
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| CN202021358760.7U Active CN212660022U (en) | 2020-07-10 | 2020-07-10 | Double-winding stator and motor |
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Address after: 215000 52 tianedang Road, Yuexi, Wuzhong District, Suzhou City, Jiangsu Province Patentee after: Suzhou Huichuan United Power System Co.,Ltd. Address before: 215000 52 tianedang Road, Yuexi Town, Wuzhong District, Suzhou City, Jiangsu Province Patentee before: SUZHOU HUICHUAN UNITED POWER SYSTEM Co.,Ltd. |
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