CN112671130A - Permanent magnet synchronous motor and magnetic ring thereof - Google Patents
Permanent magnet synchronous motor and magnetic ring thereof Download PDFInfo
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- CN112671130A CN112671130A CN201910979043.1A CN201910979043A CN112671130A CN 112671130 A CN112671130 A CN 112671130A CN 201910979043 A CN201910979043 A CN 201910979043A CN 112671130 A CN112671130 A CN 112671130A
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- magnetic ring
- synchronous motor
- ring
- magnet synchronous
- permanent magnet
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- Permanent Magnet Type Synchronous Machine (AREA)
Abstract
The invention provides a magnetic ring of a permanent magnet synchronous motor and the permanent magnet synchronous motor, and belongs to the technical field of motors. The magnetic ring is used for forming a permanent magnet synchronous motor, n grooves are arranged on the outer side of the magnetic ring, the grooves penetrate through the magnetic ring along the axial direction of the magnetic ring, and the grooves are uniformly distributed on the outer side of the magnetic ring; n is 2P, and P is the pole pair number of the motor. According to the magnetic ring of the permanent magnet synchronous motor and the permanent magnet synchronous motor, 2P grooves are arranged on the outer side of the magnetic ring according to the number P of the pole pairs of the motor, so that the air gap between a stator and a rotor can be improved, the air gap of the motor has better magnetic density sine, counter electromotive force harmonic waves are reduced, noise is reduced, and the efficiency of the motor is improved.
Description
Technical Field
The invention relates to the field of motors, in particular to a magnetic ring of a permanent magnet synchronous motor and the permanent magnet synchronous motor.
Background
The permanent magnet synchronous motor can be used in an inverter compressor. The structure of the existing permanent magnet synchronous motor is shown in fig. 1 and fig. 2, the motor mainly includes a stator 1, a rotor core 2 and a magnetic ring 3, wherein the magnetic ring 3 is located outside the rotor core 2, the stator 1 is located outside the magnetic ring 3, and an air gap is provided between the stator 1 and the magnetic ring 3.
The existing magnetic ring is generally in a hollow cylinder shape, and is sleeved on the outer side of a rotor iron core.
However, the existing magnetic ring shape causes poor air gap magnetic density sine property, larger back electromotive force harmonic wave, larger noise and lower efficiency of the motor.
Disclosure of Invention
The invention provides a magnetic ring of a permanent magnet synchronous motor and the permanent magnet synchronous motor, which aim to solve the technical problems of poor air gap magnetic density sine property, large back electromotive force harmonic wave, high noise and low efficiency of the motor.
In order to solve the technical problem, the invention provides a magnetic ring of a permanent magnet synchronous motor, wherein the magnetic ring is used for forming the permanent magnet synchronous motor, n grooves are arranged on the outer side of the magnetic ring, the grooves penetrate through the magnetic ring along the axial direction of the magnetic ring, and the grooves are uniformly distributed on the outer side of the magnetic ring;
the n is 2P, and the P refers to the pole pair number of the motor.
Optionally, on the cross section of the magnetic ring, the inner ring of the magnetic ring is circular; the outer ring of the magnetic ring is formed by sequentially connecting n circular arcs; the intersection point of two adjacent arcs is the deepest point of the groove.
Optionally, the n grooves have the same shape and size, and the n circular arcs have the same shape and size.
Optionally, on the cross section of the magnetic ring, an angle θ formed by taking a circle center of the magnetic ring as a vertex and taking a connecting line between each vertex and each end point of the arc as an edge is 360 °/2P.
Optionally, the maximum outer radius of the magnetic ring is R, the radius of the circle where the circular arc is located is R2, and R2 satisfy 0.35 ≤ R2/R < 1.
Optionally, the maximum depth of the grooves is D, which satisfies D ≦ (R-R2) × 2/3.
Optionally, on the cross section of the magnetic ring, a center distance D1 between the center of the magnetic ring and the center of the circle where the circular arc is located satisfies 0.7-1D 1/R.
Optionally, the magnetic ring is made of sintered magnet, bonded magnet or ferrite.
The invention also provides a permanent magnet synchronous motor which comprises a stator and a rotor core and is characterized by further comprising any one of the magnetic rings, wherein the magnetic rings are sleeved on the outer side of the rotor core, and the stator surrounds the outer side of the magnetic rings.
According to the magnetic ring of the permanent magnet synchronous motor and the permanent magnet synchronous motor, 2P grooves are arranged on the outer side of the magnetic ring according to the number P of the pole pairs of the motor, so that the air gap between a stator and a rotor can be improved, the air gap of the motor has better magnetic density sine, counter electromotive force harmonic waves are reduced, noise is reduced, and the efficiency of the motor is improved.
Drawings
FIG. 1 is a schematic diagram of a prior art electric motor;
FIG. 2 is a schematic structural view of the rotor core and magnet ring of FIG. 1;
fig. 3 is a schematic structural diagram of a magnetic ring of a permanent magnet synchronous motor according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of an electric motor according to an embodiment of the present invention;
FIG. 5 is a schematic structural view of the rotor core and magnet ring of FIG. 4;
FIG. 6 is a waveform diagram of the back EMF of the motor before and after optimization provided by an embodiment of the present invention;
fig. 7 is a schematic diagram of the relationship between the pole arc recess depth and the back electromotive force and cogging torque of the motor provided by the embodiment of the invention.
[ reference numerals are described below ]:
1-a stator; 2-a rotor core; 3-a magnetic ring;
11-a stator; 12-a rotor core; 13-a magnetic ring; 14-a groove; 15-polar arc.
Detailed Description
In order to make the objects, advantages and features of the present invention more clear, the magnetic ring of the permanent magnet synchronous motor and the permanent magnet synchronous motor provided by the present invention will be further described in detail with reference to the accompanying drawings. It is to be noted that the drawings are in a very simplified form and are not to precise scale, which is merely for the purpose of facilitating and distinctly claiming the embodiments of the present invention.
As shown in fig. 3, the present invention provides a magnetic ring 13 of a permanent magnet synchronous motor, where the magnetic ring 13 is used to form the permanent magnet synchronous motor, n slots 14 are provided on the outer side of the magnetic ring 13, the slots 14 penetrate the magnetic ring 13 along the axial direction of the magnetic ring 13, and the slots 14 are uniformly distributed on the outer side of the magnetic ring 13; n is 2P, and P is the pole pair number of the motor.
According to the magnetic ring of the permanent magnet synchronous motor, 2P grooves are arranged on the outer side of the magnetic ring according to the pole pair number P of the motor, so that an air gap between a stator and a rotor can be improved, the air gap magnetic density sine of the motor is better, counter electromotive force harmonic waves are reduced, noise is reduced, and the efficiency of the motor is improved.
According to the test results, the following alternatives can make the air gap magnetic density sine of the motor better, reduce the counter electromotive force harmonic wave, reduce the noise and improve the efficiency of the motor.
Optionally, as shown in fig. 3, on the cross section of the magnetic ring, the inner ring of the magnetic ring is circular; the outer ring of the magnetic ring is formed by sequentially connecting n circular arcs, and the circular arcs can be called as polar arcs 15; the intersection of two adjacent pole arcs 15 is the deepest point of the slot 14.
Optionally, for the same magnetic ring, the n slots on the outer side of the same magnetic ring are the same in shape and size, the n arcs are the same, and the slots are uniformly distributed on the outer side of the magnetic ring. The cross section of the magnetic ring shown in fig. 3 is in a petal type, and the shape and the size of each petal are the same. As shown in fig. 6, compared with the magnetic ring before optimization, the harmonic content of the optimized back electromotive force corresponding to the magnetic ring of the present embodiment is greatly reduced, the sine of the back electromotive force is also better, and the cogging torque and the torque ripple are also greatly reduced.
Alternatively, as shown in fig. 3 and 5, on the cross section of the magnetic ring 13, an angle θ formed by using a circle center of the magnetic ring 13 as a vertex and connecting lines between the vertex and two end points of the polar arc 15 as sides is 360 °/2P, where "/" indicates a division.
Optionally, as shown in fig. 3 and 5, the maximum outer radius of the magnetic ring 13 is R, the radius of a circle where a pole arc of the magnetic ring 13 is located is R2, the outer radius of the rotor core 12 is R1, the pole arc refers to an arc between deepest points of two adjacent slots on the cross section of the magnetic ring 13, as shown in fig. 3, the pole arc 15 refers to an outwardly convex arc between deepest points of two adjacent slots, and R2 satisfy 0.35 ≦ R2/R < 1. On the basis of the structure shown in fig. 1, when the slots of the magnetic ring 13 are processed, the minimum air gap between the stator and the rotor can be kept unchanged, that is, the maximum outer radius of the processed magnetic ring 13 is equal to the outer radius of the magnetic ring 13 before processing.
Alternatively, as shown in FIG. 5, the maximum depth of the grooves is D, and D satisfies D ≦ (R-R2) × 2/3, where "×" indicates a multiplication number and "/" indicates a division number. The maximum depth D of the slot must not be too great, which would reduce the back emf of the motor, thereby reducing the efficiency of the motor. As shown in fig. 7, as the maximum depth of the groove, which may also be referred to as the pole arc indentation depth, increases, the cogging torque gradually decreases, but the value of the back electromotive force also gradually decreases; the counter potential in fig. 7 refers to a counter electromotive force.
Optionally, as shown in fig. 5, on the cross section of magnetic ring 13, a center distance D1 between the center of magnetic ring 13 and the center of the circle where the arc (polar arc) is located satisfies 0.7 ≤ D1/R < 1.
Optionally, the magnetic ring provided by the invention can be made of sintered magnets, bonded magnets or ferrite and other materials. Preferably, the bonded magnet or ferrite can be processed into a petal-shaped magnetic ring because the bonded magnet and ferrite can be more easily molded and optimization of the shape of the magnet is more feasible.
Based on the same technical concept as that of the magnetic ring of the permanent magnet synchronous motor, the embodiment of the invention also provides a permanent magnet synchronous motor, as shown in fig. 4, the motor comprises a stator 11 and a rotor core 12, the motor further comprises any one of the magnetic rings 13, the magnetic ring 13 is sleeved on the outer side of the rotor core 12, and the stator 11 surrounds the outer side of the magnetic ring 13.
According to the permanent magnet synchronous motor provided by the invention, 2P grooves are arranged on the outer side of the magnetic ring according to the pole pair number P of the motor, so that the air gap between the stator and the rotor can be improved, the air gap magnetic density sine of the motor is better, the counter electromotive force harmonic wave is reduced, the noise is reduced, and the efficiency of the motor is improved.
The above description is only for the purpose of describing the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention, and any variations and modifications made by those skilled in the art based on the above disclosure are within the scope of the claims of the present invention.
Claims (9)
1. A magnetic ring of a permanent magnet synchronous motor is used for forming the permanent magnet synchronous motor, and is characterized in that n grooves are formed in the outer side of the magnetic ring, penetrate through the magnetic ring along the axial direction of the magnetic ring, and are uniformly distributed on the outer side of the magnetic ring;
the n is 2P, and the P refers to the pole pair number of the motor.
2. The magnet ring of a permanent magnet synchronous motor according to claim 1, wherein, in a cross section of the magnet ring, an inner ring of the magnet ring is circular; the outer ring of the magnetic ring is formed by sequentially connecting n circular arcs; the intersection point of two adjacent arcs is the deepest point of the groove.
3. A magnetic ring for a permanent magnet synchronous motor according to claim 2, wherein said n slots are identical in shape and size, and said n arcs are identical.
4. A magnetic ring for a permanent-magnet synchronous motor according to claim 3, wherein an angle θ formed by a cross section of the magnetic ring with a center of the magnetic ring as a vertex and a line between each of the vertex and each of two end points of the arc as a side is 360 °/2P.
5. The magnetic ring of the permanent magnet synchronous motor as claimed in claim 4, wherein the maximum outer radius of the magnetic ring is R, the radius of the circle where the circular arc is located is R2, and R2 satisfy 0.35 ≦ R2/R < 1.
6. A magnetic ring for a permanent magnet synchronous motor according to claim 5, characterized in that the maximum depth of the slots is D, said D satisfying D ≦ (R-R2) × 2/3.
7. The magnetic ring of the permanent magnet synchronous motor as claimed in claim 6, wherein, on the cross section of the magnetic ring, a center distance D1 between the center of the magnetic ring and the center of the circle where the circular arc is located satisfies 0.7 ≤ D1/R < 1.
8. The magnet ring of a permanent-magnet synchronous motor according to any of claims 1 to 7, characterized in that the magnet ring is made of sintered magnets, bonded magnets or ferrites.
9. A permanent magnet synchronous motor, said motor comprising a stator and a rotor core, characterized in that said motor further comprises a magnet ring as claimed in any one of claims 1 to 8, said magnet ring being fitted around the outside of said rotor core, said stator surrounding the outside of said magnet ring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910979043.1A CN112671130A (en) | 2019-10-15 | 2019-10-15 | Permanent magnet synchronous motor and magnetic ring thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910979043.1A CN112671130A (en) | 2019-10-15 | 2019-10-15 | Permanent magnet synchronous motor and magnetic ring thereof |
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| Publication Number | Publication Date |
|---|---|
| CN112671130A true CN112671130A (en) | 2021-04-16 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910979043.1A Pending CN112671130A (en) | 2019-10-15 | 2019-10-15 | Permanent magnet synchronous motor and magnetic ring thereof |
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| CN (1) | CN112671130A (en) |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61280744A (en) * | 1985-06-05 | 1986-12-11 | Hitachi Ltd | Rotor with permanent magnet |
| JP2002084695A (en) * | 2000-06-30 | 2002-03-22 | Kusatsu Electric Co Ltd | Permanent magnet type motor |
| JP2005261024A (en) * | 2004-03-10 | 2005-09-22 | Hitachi Ltd | Permanent magnet rotating electric machine and electric vehicle using it |
| CN103187844A (en) * | 2011-12-28 | 2013-07-03 | 爱德利科技股份有限公司 | Built-in permanent magnet motor |
| CN104753213A (en) * | 2013-12-25 | 2015-07-01 | 珠海格力节能环保制冷技术研究中心有限公司 | Permanent-magnet DC brushless motor |
| CN105048748A (en) * | 2014-04-16 | 2015-11-11 | 日本电产三协株式会社 | Motor |
| CN207835325U (en) * | 2018-03-07 | 2018-09-07 | 广东金霸智能科技股份有限公司 | A kind of new automobile air compressor motor |
| CN109245411A (en) * | 2018-10-29 | 2019-01-18 | 哈尔滨理工大学 | A kind of low permanent magnet synchronous motor made an uproar that shakes |
| US20190214862A1 (en) * | 2018-01-05 | 2019-07-11 | Nidec Motor Corporation | Electric motor with v-slot rotor |
| CN110048530A (en) * | 2019-04-22 | 2019-07-23 | 大连理工大学 | A kind of rotor structure and design method of permanent magnetism assist in synchronization reluctance motor |
-
2019
- 2019-10-15 CN CN201910979043.1A patent/CN112671130A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61280744A (en) * | 1985-06-05 | 1986-12-11 | Hitachi Ltd | Rotor with permanent magnet |
| JP2002084695A (en) * | 2000-06-30 | 2002-03-22 | Kusatsu Electric Co Ltd | Permanent magnet type motor |
| JP2005261024A (en) * | 2004-03-10 | 2005-09-22 | Hitachi Ltd | Permanent magnet rotating electric machine and electric vehicle using it |
| CN103187844A (en) * | 2011-12-28 | 2013-07-03 | 爱德利科技股份有限公司 | Built-in permanent magnet motor |
| CN104753213A (en) * | 2013-12-25 | 2015-07-01 | 珠海格力节能环保制冷技术研究中心有限公司 | Permanent-magnet DC brushless motor |
| CN105048748A (en) * | 2014-04-16 | 2015-11-11 | 日本电产三协株式会社 | Motor |
| US20190214862A1 (en) * | 2018-01-05 | 2019-07-11 | Nidec Motor Corporation | Electric motor with v-slot rotor |
| CN207835325U (en) * | 2018-03-07 | 2018-09-07 | 广东金霸智能科技股份有限公司 | A kind of new automobile air compressor motor |
| CN109245411A (en) * | 2018-10-29 | 2019-01-18 | 哈尔滨理工大学 | A kind of low permanent magnet synchronous motor made an uproar that shakes |
| CN110048530A (en) * | 2019-04-22 | 2019-07-23 | 大连理工大学 | A kind of rotor structure and design method of permanent magnetism assist in synchronization reluctance motor |
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Application publication date: 20210416 |
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| RJ01 | Rejection of invention patent application after publication |