CN108551214B - Three-phase motor - Google Patents
Three-phase motor Download PDFInfo
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- CN108551214B CN108551214B CN201810364867.3A CN201810364867A CN108551214B CN 108551214 B CN108551214 B CN 108551214B CN 201810364867 A CN201810364867 A CN 201810364867A CN 108551214 B CN108551214 B CN 108551214B
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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
- H02K1/14—Stator cores with salient poles
- H02K1/146—Stator cores with salient poles consisting of a generally annular yoke with salient poles
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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
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/27—Rotor cores with permanent magnets
- H02K1/2706—Inner rotors
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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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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Iron Core Of Rotating Electric Machines (AREA)
Abstract
The invention discloses a three-phase motor which comprises a stator assembly and a rotor assembly. The stator assembly is provided with an inner hole and comprises a stator core and a winding, the stator core comprises a plurality of tooth parts, and the winding is wound on the tooth parts; the rotor assembly is arranged in the inner hole, the rotor assembly at least comprises 1 pair of magnetic poles, and the ratio of the number of the magnetic pole pairs to the number of the teeth is 1: 6. According to the technical scheme, on the premise that the phase difference between the A-phase sub-winding and the B-phase sub-winding is 120 degrees and the phase difference between the B-phase sub-winding and the C-phase sub-winding is 120 degrees, the ratio of the number of the pole pairs to the number of the teeth is set to be 1:6, and in the prior art, the ratio of the number of the pole pairs to the number of the teeth is 1: 3. The three-phase motor has symmetrical electromagnetic structure, and the rotor does not generate strong unilateral magnetic pull force in the motor running process, thereby reducing the noise of the three-phase motor in high-speed running.
Description
Technical Field
The invention relates to the field of motors, in particular to a three-phase motor.
Background
The three-phase permanent magnet synchronous motor has advantages of simple electromagnetic structure and driving system, and the like, and can adopt concentrated winding, and thus is used in various occasions including as a high-speed motor. Conventionally, the number of teeth of a stator core of a three-phase permanent magnet synchronous motor with concentrated windings is 3:1 in relation to the number of pairs of rotor poles, for example, a rotor with 1 pair of poles corresponds to a stator core with 3 teeth. When the motor is used in ultra-high speed occasions, for example, more than 5 ten thousand revolutions per minute (50k rpm), the stator core adopts a 3-tooth structure, the upper part and the lower part or the left part and the right part of the stator core are asymmetric in electromagnetic structure, even if the rotor is installed without eccentricity, the rotor still can generate strong unilateral magnetic pull force, and therefore strong noise is generated when the motor rotates at high speed.
Disclosure of Invention
The invention mainly aims to provide a three-phase motor, aiming at reducing the noise of the three-phase motor during high-speed operation.
To achieve the above object, the present invention provides a three-phase motor including:
the stator assembly is provided with an inner hole and comprises a stator core and a winding, the stator core comprises a plurality of tooth parts, and the winding is wound on the tooth parts; and
the rotor assembly is arranged in the inner hole and at least comprises 1 pair of magnetic poles, and the ratio of the number of the magnetic pole pairs to the number of the tooth parts is 1: 6.
Preferably, the rotor assembly has 1 pair of magnetic poles, and the stator core has 6 teeth.
Preferably, 6 tooth portions are arranged at intervals, and the included angle between every two adjacent tooth portions in the length direction is 60 degrees.
Preferably, the windings include an a-phase sub-winding, a B-phase sub-winding and a C-phase sub-winding, the a-phase sub-winding, the B-phase sub-winding and the C-phase sub-winding are sequentially wound on the 6 teeth along a counterclockwise direction according to A, B, C, and winding directions of the same-phase sub-windings on the opposite teeth are opposite.
Preferably, the windings include an a-phase sub-winding, a B-phase sub-winding and a C-phase sub-winding, the a-phase sub-winding, the B-phase sub-winding and the C-phase sub-winding are sequentially wound on the 6 teeth along a clockwise direction according to A, A, B, B, C, C, and winding directions of the same-phase sub-windings on two adjacent teeth are the same.
Preferably, the stator core comprises a yoke part fixedly connected with the tooth part, and the inner hole is enclosed by the end surface of the tooth part, which is far away from the yoke part.
Preferably, end surfaces of the teeth facing away from the yoke extend outward in a width direction of the teeth.
Preferably, the yoke is provided in an annular shape, and the teeth are provided on an inner peripheral wall of the yoke at intervals in a circumferential direction of the yoke.
Preferably, the yoke is integrally formed with the tooth.
Preferably, the rotor assembly includes a rotor shaft, a rotor core and a permanent magnet, the rotor core is sleeved and fixed on the rotor shaft, and the permanent magnet is fixedly arranged on the rotor core.
According to the three-phase motor, on the premise that the phase difference between the A-phase sub-winding and the B-phase sub-winding is 120 degrees, and the phase difference between the B-phase sub-winding and the C-phase sub-winding is 120 degrees, the ratio of the number of the magnetic pole pairs to the number of the tooth parts is set to be 1:6, and in the prior art, the ratio of the number of the magnetic pole pairs to the number of the tooth parts is set to be 1: 3.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a three-phase motor according to an embodiment of the present invention;
fig. 2 is a schematic structural view of the stator core of fig. 1;
FIG. 3 is a schematic structural diagram of a winding method of a three-phase motor according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of another embodiment of a winding method of a three-phase motor according to the present invention.
The reference numbers illustrate:
| reference numerals | Name (R) | Reference numerals | Name (R) |
| 10 | Stator assembly | 111 | |
| 20 | |
112 | Toothed |
| 11 | |
113 | |
| 12 | |
13 | Inner bore |
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that, if directional indications (such as up, down, left, right, front, and back … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative positional relationship between the components, the movement situation, and the like in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indications are changed accordingly.
In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
The invention provides a three-phase motor.
In an embodiment of the present invention, as shown in fig. 1 and 2, the three-phase motor includes a stator assembly 10 and a rotor assembly 20. The stator assembly 10 has an inner bore 13, and the rotor assembly 20 is rotatably mounted within the inner bore 13. The stator assembly 10 includes a stator core 11 and a winding 12, the stator core 10 includes a plurality of teeth 112 and a yoke portion 111 fixedly connected to the teeth 112, and an end surface of the teeth 112 facing away from the yoke portion 111 encloses the inner hole 13. The winding 12 is wound on the tooth portion 112, and the winding 12 includes an a-phase sub-winding, a B-phase sub-winding, and a C-phase sub-winding. The phase A sub-winding and the phase B sub-winding have a phase difference of 120 DEG, and the phase B sub-winding and the phase C sub-winding have a phase difference of 120 deg.
The rotor assembly 20 comprises a rotor shaft, a rotor core and a permanent magnet, the rotor core is sleeved and fixed on the rotor shaft, and the permanent magnet is fixedly arranged on the rotor core. Preferably, the permanent magnet is sintered neodymium iron boron magnetic steel, and the sintered neodymium iron boron magnetic steel has the characteristic of high anisotropy. The rotor assembly 20 has at least 1 pair of magnetic poles, and the ratio of the number of the pair of magnetic poles to the number of the teeth 112 is 1: 6.
According to the technical scheme, on the premise that the phase difference between the A-phase sub-winding and the B-phase sub-winding is 120 degrees, and the phase difference between the B-phase sub-winding and the C-phase sub-winding is 120 degrees, the ratio of the number of the magnetic pole pairs to the number of the tooth parts 112 is set to be 1:6, and compared with the prior art that the ratio of the number of the magnetic pole pairs to the number of the tooth parts 112 is set to be 1:3, the three-phase motor is symmetrical in electromagnetic structure, a rotor assembly 20 cannot generate strong unilateral magnetic pull force in the motor running process, and the noise of the three-phase motor in high-speed running is reduced.
Specifically, in the present embodiment, the rotor assembly 20 has 1 pair of magnetic poles, and the stator core 11 has 6 teeth. It is understood that, in other embodiments, the rotor assembly 20 may have 2 pairs of magnetic poles, the stator core 11 may have 12 teeth, and the number of the pairs of magnetic poles and the number of the teeth 112 are not limited as long as the ratio of the number of the pairs of magnetic poles to the number of the teeth 112 is 1: 6. Because in this embodiment, the permanent magnet is preferably sintered neodymium iron boron magnetic steel, the rotor assembly 20 is not easy to realize more than 1 pair of magnetic poles, and is easier to realize 1 pair of magnetic poles, so in this embodiment, the rotor assembly 20 has 1 pair of magnetic poles.
Further, in order to facilitate winding the winding 12 on the tooth portion 112 and facilitate processing and forming the stator core 11, the yoke portion 111 is annularly disposed, 6 tooth portions 112 are circumferentially disposed on an inner peripheral wall of the yoke portion 111 at intervals along the yoke portion 111, and an included angle between two adjacent tooth portions 112 in a length direction is 60 °.
Regarding the specific winding manner of the a-phase sub-winding, the B-phase sub-winding and the C-phase sub-winding, in an embodiment of the present invention, as shown in fig. 3, the a-phase sub-winding, the B-phase sub-winding and the C-phase sub-winding are sequentially wound on 6 of the teeth 112 in the order of A, B, C, A, B, C along the counterclockwise direction, and the winding directions of the same-phase sub-winding on the opposite teeth 112 are opposite (as shown in fig. 3, A, B, C represents inward from the vertical paper surface, and X, Y, Z represents outward from the vertical paper surface). The phase A sub-winding, the phase B sub-winding and the phase C sub-winding which are wound in the same direction can still achieve the effect that the phase A sub-winding and the phase B sub-winding have 120-degree phase difference and the phase B sub-winding and the phase C sub-winding have 120-degree phase difference. After the power is supplied, the magnetic pulling forces of the opposite tooth parts 112 on the rotor assembly 20 are the same in magnitude and opposite in direction, so that the magnetic pulling forces on the rotor assembly 20 are balanced, and the motor does not generate large noise during high-speed operation.
In another embodiment of the present invention, as shown in fig. 4, the a-phase sub-winding, the B-phase sub-winding and the C-phase sub-winding are sequentially wound on 6 of the teeth 112 in the order of A, A, B, B, C, C along the clockwise direction, and the winding directions of the same-phase sub-windings on two adjacent teeth 112 are the same (as shown in fig. 4, A, B, C represents the direction facing the inside of the page, and X, Y, Z represents the direction facing the outside of the page). Because the same winding direction of the same-phase sub-windings on two adjacent teeth 112 is the same, the same-phase sub-windings on two adjacent teeth 112 can be regarded as a larger sub-winding, for example, the a-phase sub-windings on two adjacent teeth 112 can be regarded as an equivalent a0The sub-winding of the B-phase on two adjacent teeth 112 can be regarded as an equivalent B0The sub-winding of the C-phase on two adjacent teeth 112 can be regarded as an equivalent C0Sub-winding, A0Sub-windings and B0The sub-windings having a phase difference of 120 DEG, B0Sub-windings and C0The sub-windings have a phase difference of 120 °. After the power is supplied, the magnetic pulling forces of the opposite tooth parts 112 on the rotor assembly 20 are the same in magnitude and opposite in direction, so that the magnetic pulling forces on the rotor assembly 20 are almost balanced, and the motor does not generate large noise during high-speed operation.
Further, end surfaces of the tooth portions 112 facing away from the yoke portion 111 extend outward in the width direction of the tooth portions 112. The portion of the tooth portion 112 extending outward from the end face and the inner wall surface of the yoke portion 111 define a stator slot 113, the winding 12 is wound in the stator slot 113, and after the winding 12 is successfully wound, the winding 12 does not fall off the tooth portion 112.
Further, in order to improve mechanical stability of the stator core 11, the yoke portion 111 is integrally formed with the tooth portion 112. The stator core 11 has high mechanical stability, and noise is reduced when the motor is operated at high speed.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (6)
1. A three-phase electric machine, comprising:
the stator assembly is provided with an inner hole and comprises a stator core and a winding, the stator core comprises a plurality of tooth parts, the winding is wound on the tooth parts and comprises an A-phase sub-winding, a B-phase sub-winding and a C-phase sub-winding, the A-phase sub-winding and the B-phase sub-winding have a phase difference of 120 degrees, and the B-phase sub-winding and the C-phase sub-winding have a phase difference of 120 degrees; and
the rotor assembly is arranged in the inner hole and at least comprises 1 pair of magnetic poles, and the ratio of the number of the magnetic pole pairs of the magnetic poles to the number of the tooth parts is 1: 6;
the rotor assembly has 1 pair of magnetic poles, and the stator core has 6 teeth; the 6 tooth parts are arranged at intervals, and the included angle between every two adjacent tooth parts in the length direction is 60 degrees;
the phase A sub-winding, the phase B sub-winding and the phase C sub-winding are sequentially wound on the 6 tooth parts along the anticlockwise direction according to the A, B, C, A, B, C sequence, and the winding directions of the same-phase sub-windings on the opposite tooth parts are opposite; alternatively, the first and second electrodes may be,
the phase A sub-winding, the phase B sub-winding and the phase C sub-winding are sequentially wound on the 6 tooth parts along the clockwise direction according to the A, A, B, B, C, C sequence, and the winding directions of the same-phase sub-windings on the two adjacent tooth parts are the same;
after the power is switched on, the magnetic pull forces of the opposite tooth parts to the rotor assembly are the same in magnitude and opposite in direction.
2. The three-phase motor of claim 1, wherein the stator core includes a yoke portion fixedly connected to the teeth, and wherein end surfaces of the teeth facing away from the yoke portion enclose the inner bore.
3. The three-phase motor according to claim 2, wherein an end surface of the tooth portion facing away from the yoke portion extends outward in a width direction of the tooth portion.
4. The three-phase motor according to claim 2, wherein the yoke is provided in an annular shape, and the teeth are provided on an inner circumferential wall of the yoke at intervals in a circumferential direction of the yoke.
5. The three-phase electric motor of claim 2, wherein the yoke is integrally formed with the teeth.
6. The three-phase motor according to claim 1, wherein the rotor assembly includes a rotor shaft, a rotor core, and a permanent magnet, the rotor core is fixedly sleeved on the rotor shaft, and the permanent magnet is fixedly disposed on the rotor core.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810364867.3A CN108551214B (en) | 2018-04-20 | 2018-04-20 | Three-phase motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810364867.3A CN108551214B (en) | 2018-04-20 | 2018-04-20 | Three-phase motor |
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| Publication Number | Publication Date |
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| CN108551214A CN108551214A (en) | 2018-09-18 |
| CN108551214B true CN108551214B (en) | 2020-09-22 |
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| CN201810364867.3A Active CN108551214B (en) | 2018-04-20 | 2018-04-20 | Three-phase motor |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2165567Y (en) * | 1993-09-28 | 1994-05-18 | 向可为 | Rare-earth permanent-magnet industrial frequency electric generator |
| CN1106584A (en) * | 1994-10-31 | 1995-08-09 | 白侠斌 | Generator having new structure |
| JP2001309625A (en) * | 2000-04-20 | 2001-11-02 | Mitsubishi Electric Corp | Motor of permanent-magnet type |
| CN101820190A (en) * | 2010-01-22 | 2010-09-01 | 王铂仕 | Motor with strong weak air-gap field in alternative distribution |
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