CN210350988U - Low-noise permanent magnet synchronous motor rotor - Google Patents
Low-noise permanent magnet synchronous motor rotor Download PDFInfo
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- CN210350988U CN210350988U CN201822189764.6U CN201822189764U CN210350988U CN 210350988 U CN210350988 U CN 210350988U CN 201822189764 U CN201822189764 U CN 201822189764U CN 210350988 U CN210350988 U CN 210350988U
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- 230000001360 synchronised effect Effects 0.000 title claims description 11
- 229910000831 Steel Inorganic materials 0.000 claims description 45
- 239000010959 steel Substances 0.000 claims description 45
- 238000004080 punching Methods 0.000 claims description 19
- 239000010410 layer Substances 0.000 description 30
- 230000003014 reinforcing effect Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000003313 weakening effect Effects 0.000 description 4
- 230000004907 flux Effects 0.000 description 3
- 230000014509 gene expression Effects 0.000 description 3
- 230000003993 interaction Effects 0.000 description 3
- 238000002955 isolation Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000002356 single layer Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000010349 pulsation Effects 0.000 description 2
- 206010019233 Headaches Diseases 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 231100000869 headache Toxicity 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 238000009827 uniform distribution Methods 0.000 description 1
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Abstract
The utility model relates to a low noise PMSM rotor, two kinds at least unit motors have been laid to the rotor towards the piece body, and the magnetic pole structure of every kind of unit motor is inequality, and the magnetic pole among every kind of unit motor is symmetrical evenly distributed structure, and the magnetic pole structure of unit motor adopts U type structure or V type structure. The phase positions of 0-order force waves generated by different magnetic pole structures are different, so that the 0-order force waves of 24-order and 48-order motors and the like can be effectively weakened, and the electromagnetic vibration noise is reduced.
Description
Technical Field
The utility model belongs to the technical field of synchronous machine's technique and specifically relates to a low noise PMSM rotor especially relates to a built-in low noise PMSM rotor.
Background
The permanent magnet synchronous motor is widely applied to automobile driving, and factors influencing the performance of the permanent magnet synchronous motor are many, but what makes designers feel more headache is the influence of motor vibration noise on the performance of the motor.
The magnetic field generated by the permanent magnet is not a standard sinusoidal magnetic field, the armature current is unbalanced, the rotor is eccentric, the iron core saturation effect and the stator slot are generated, and the factors cause the generation of a harmonic magnetic field in the air gap of the motor. The interaction of the harmonic magnetic fields generates electromagnetic force waves, which act on the stator core to cause the stator and its associated mechanical structure to vibrate. Thus, electromagnetic waves are the excitation of electromagnetic vibrations and noise. The force wave components are complicated by the interaction of multiple harmonic magnetic fields. The low-order force wave amplitude is large, and when the frequency of the low-order force wave amplitude is close to the natural modal frequency of the motor, the motor resonance is easily caused, and the performance of electromagnetic vibration and noise is aggravated. Therefore, the size, the order and the frequency of the electromagnetic force wave are directly related to the electromagnetic vibration and the noise of the motor.
The existing motor noise reduction method is mainly based on the aspects of reducing electromagnetic noise, improving structural strength, isolating propagation paths and the like, but the cost of the two attenuation modes is relatively high, and the method for reducing the electromagnetic vibration noise of the motor becomes an economical and reliable mode from the electromagnetic design aspect.
For example, in the electromagnetic vibration noise of the 48-slot 8-pole interior permanent magnet synchronous motor, the 24 th order and the 48 th order are main noise sources and are not easily weakened in the traditional symmetrical structure.
Therefore, there is a high demand in the market for a synchronous motor rotor that can attenuate the vibration noise of the motor.
Disclosure of Invention
An object of the utility model is to provide a modified low noise PMSM rotor, it can overcome among the prior art electromagnetic noise should not weaken, vibrate too big not enough.
In order to realize the purpose, the technical scheme of the utility model is that: the utility model provides a low noise PMSM rotor, includes the rotor punching body, its characterized in that: at least two unit motors are distributed on the rotor punching sheet body, the magnetic pole structure of each unit motor is different, the magnetic poles in each unit motor are of a symmetrical and uniformly distributed structure, and the magnetic pole structure of each unit motor adopts a U-shaped structure, a V-shaped structure, an inverted triangular structure or a one-shaped structure.
Preferably, the rotor sheet body is provided with two or three unit motors, the two or three unit motors are arranged at intervals, and the same unit motor is symmetrically distributed along the axis of the rotor body.
Further, a rotor groove is formed in the rotor punching body, magnetic steel is arranged in the rotor groove, a unit motor with a U-shaped structure is provided with a double-layer U-shaped rotor groove, the double-layer U-shaped rotor groove comprises a U-shaped inner rotor groove and a U-shaped outer rotor groove, and an inner layer magnetic steel and an outer layer magnetic steel are respectively arranged in the U-shaped inner rotor groove and the U-shaped outer rotor groove; the unit motor of V type structure is equipped with V type rotor groove, is equipped with first, the second V type magnet steel in the V type rotor groove.
Furthermore, the rotor punching sheet body is divided into four equal parts, two parts which are symmetrical in pairs along the central axis of the rotor punching sheet body are provided with the same unit motors, and each unit motor is provided with two groups of V-shaped magnetic steels or two groups of double-layer U-shaped magnetic steels. The magnetic steel in the rotor slot is composed of one or more permanent magnets.
Compared with the prior art, the technical scheme of the utility model except whole technical scheme's improvement, still include the improvement in the aspect of many details, particularly, have following beneficial effect:
1. in the improved scheme of the utility model, at least two unit motors are distributed on the rotor punching sheet body, the magnetic pole structure of each unit motor is different, the magnetic poles in each unit motor are symmetrical and evenly distributed structures, the 0-order force waves generated by different structures are different in phase, the 0-order force waves of 24 orders, 48 orders and the like of the motors can be effectively weakened, and the electromagnetic vibration noise is reduced;
2. in the technical scheme of the utility model, two unit motors are arranged on the rotor punching sheet body, namely a U-shaped structure unit motor and a V-shaped structure unit motor, and the magnetic density widths generated by the two layers of magnetic steel are different, so that the harmonic wave can be better weakened;
3. the utility model can change the output torque of the unit motors by adjusting the magnetic pole structures of different unit motors, and the output torques of different unit motors are different to generate phase difference, thereby weakening the torque pulsation of the motor;
4. the utility model discloses simple structure, the manufacturing of being convenient for easily popularizes and applies.
Drawings
Fig. 1 is a schematic diagram of an electromagnetic force received by a rotor of a permanent magnet synchronous motor in the prior art.
Fig. 2 is a schematic view of the electromagnetic force receiving device of the present invention.
Fig. 3 is a schematic view of the tangent plane structure of the motor rotor of the present invention.
Fig. 4 is another schematic structural diagram of the tangent plane of the motor rotor according to the present invention.
Fig. 5 is a schematic structural view of the motor rotor of the present invention.
Fig. 6 is a schematic structural diagram of another embodiment of the present invention.
Fig. 7 is a schematic diagram of the embodiment of fig. 6 showing the electromagnetic force.
Reference numerals:
a U-type structural motor unit, B V-type structural motor unit and C-type inverted triangle structural motor unit;
1 outer layer magnetic steel and 2 inner layer magnetic steel;
3, a first V-shaped magnetic steel and 4 a second V-shaped magnetic steel;
5 rotor surface grooves and 6 rotor punching sheet bodies.
Detailed Description
The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
The utility model provides a low noise PMSM rotor, specifically refer to FIG. 1, including the rotor punching body, its difference with prior art lies in: at least two unit motors are distributed on the rotor punching sheet body, the magnetic pole structures of each unit motor are different, the magnetic poles in each unit motor are of symmetrical and uniform distribution structures, namely, the rotor slots of each unit motor are symmetrically distributed, and the magnetic pole structures of the unit motors adopt U-shaped structures, V-shaped structures, inverted triangle structures or one-shaped structures.
Particularly, the rotor punching body is provided with two unit motors which are arranged at intervals, the same unit motor is symmetrically distributed along the axis of the rotor body, namely, the unit motor A corresponds to the unit motor A, the unit motor B corresponds to the unit motor B, the unit motor A adopts a double-U-shaped magnetic pole structure, and the unit motor B adopts a V-shaped magnetic pole structure, so that the whole motor has a certain topological structure.
Further, according to 0-order force wave expression
According to 8-order force wave expression
In one embodiment, the synchronous motor rotor is provided with two unit motors which are arranged at intervals, wherein the unit motor A adopts a double-layer U-shaped structure, the unit motor B adopts a V-shaped structure, and the V-shaped structure is a single-layer structure.
The rotor punching sheet body is provided with a rotor groove, magnetic steel is arranged in the rotor groove, the unit motor with the U-shaped structure is provided with a double-layer U-shaped rotor groove, the double-layer U-shaped rotor groove comprises a U-shaped inner rotor groove and a U-shaped outer rotor groove, and an inner layer magnetic steel and an outer layer magnetic steel are respectively arranged in the U-shaped inner rotor groove and the U-shaped outer rotor groove; the unit motor of V type structure is equipped with V type rotor groove, is equipped with first, the second V type magnet steel in the V type rotor groove. The magnetic steel in the rotor slot is composed of one or more permanent magnets.
In another embodiment (see fig. 6 and 7), three unit motors are arranged on the rotor sheet body, the three unit motors are arranged at intervals, the same unit motor is symmetrically distributed along the axis of the rotor body, the structure is a 12-pole rotor, three unit single machines are respectively of a double-layer U-shaped structure, a V-shaped structure and an inverted triangle structure, when the unit motors are arranged, the two double-layer U-shaped structures serve as a unit motor a, the double-layer U-shaped structure comprises outer-layer magnetic steel, inner-layer magnetic steel and auxiliary magnetic steel arranged between the inner-layer magnetic steel and the outer-layer magnetic steel, the two V-shaped structures serve as a unit motor B, the two inverted triangle structures serve as a unit motor C, and magnetic poles are symmetrically.
The motor model with 3 units is adopted, the number of pole pairs is a multiple of 3, and the advantages are as follows:
1. 3 unit motors are adopted, so that 0-order electromagnetic force waves of the motors can be effectively weakened, and vibration noise of the motors is reduced;
2. the torque pulsation of the motor can be weakened and counter electromotive force harmonic can be reduced due to the asymmetry of the structure on the circumference;
3. two unit motor models cannot be adopted in the 3-pair-pole model and the 9-pair-pole model, and only 3 unit motor models can be adopted.
In another embodiment, the rotor sheet body is divided into four equal parts, two parts which are symmetrical in pairs along the central axis of the rotor sheet body are provided with the same unit motors, each unit motor is provided with two groups of V-shaped magnetic steels or two groups of double-layer U-shaped magnetic steels, each unit motor B is provided with two groups of V-shaped rotor grooves which are symmetrically arranged, V-shaped groove reinforcing ribs are arranged between the left side groove and the right side groove of each V-shaped rotor groove, the V-shaped rotor grooves are internally provided with independent or spliced magnetic steels, and gaps are reserved between the two ends of the magnetic steels and the end parts of the V-shaped rotor grooves.
The V-shaped included angle range of the V-shaped rotor groove is 120-145 degrees; the U-shaped inner rotor magnetic steel is arranged in the middle of the U-shaped inner rotor groove, the U-shaped outer rotor groove is composed of a middle groove and two symmetrically arranged side grooves, reinforcing ribs are arranged between the middle groove and the side grooves, and the width range value of the reinforcing ribs is 0.8-2.0mm, preferably 1.2 mm.
The main rotor harmonics which affect the electromagnetic vibration noise performance of the motor are 5, 7, 11 and 13 harmonics, wherein the single motor unit model can only perform targeted attenuation on the 5, 7 or 11 and 13 harmonics, but cannot attenuate the 0-order force wave generated by the interaction with the stator harmonics. The unit A motor adopts double-layer magnetic steel arrangement, the distance value between the double-layer magnetic steels is 6-10mm, the unit B motor adopts single-layer magnetic steel arrangement, the magnetic density widths generated by the two layers of magnetic steels are respectively l1 and l1 ', and in order to achieve better harmonic attenuation, the magnetic density lengths l2 and l 2' should satisfy the following relational expressions as far as possible.
The attenuation of the 0 th order 24 order harmonics requires the following relation:
the 0 th order 48 th order harmonic is attenuated by satisfying the relation:
the magnetic steel leakage, iron core saturation and reinforcing rib influence are considered, the actual width of each section of magnetic steel needs to be slightly compensated, and the width of the magnetic steel is corrected:
and (3) calculating the width of the magnetic steel after the double-layer structure is corrected:
and (3) calculating the width of the magnetic steel after the single-layer structure is corrected:
in the formula hrib2The width of the second layer of strengthening ribs is 0.8-2.0mm, hbridge1、 hbridge2The width of the magnetic isolation bridge of the first layer and the second layer is selected within the range of 0.8-1.2 mm, and r is the radius of the rotor; Δ x1、Δx2The distance between the sides of the magnetic steel close to the q axis and the magnetic isolation bridge is changed along with the structural change of the motor; h1 is the thickness of the first layer of magnetic steel 3-4mm, h2 is the thickness of the second layer of magnetic steel 5-6mm, delta l1、Δl2To correct for the width, the air gap flux density waveform is made to approximate a sine wave. The reinforcing rib value can ensure the service life of the die and the structural strength of the rotor punching sheet at high speed. And the smaller the width of the magnetic isolation bridge is, the more sinusoidal the air gap flux density waveform is, and the air gap sine degree is ensured.
The foregoing is a more detailed description of the invention, taken in conjunction with the accompanying preferred embodiments, and it is not intended that the invention be limited to the specific embodiments described above. To the utility model belongs to the technical field of ordinary technical personnel, do not deviate from the utility model discloses under the prerequisite of design, can also make a plurality of simple deductions or replacement, all should regard as belonging to the utility model discloses a protection scope.
Claims (4)
1. The utility model provides a low noise PMSM rotor, includes the rotor punching body, its characterized in that: at least two unit motors are distributed on the rotor punching sheet body, the magnetic pole structure of each unit motor is different, the magnetic poles in each unit motor are of a symmetrical and uniformly distributed structure, and the magnetic pole structure of each unit motor adopts a U-shaped structure, a V-shaped structure, an inverted triangular structure or a one-shaped structure.
2. The low noise PMSM rotor according to claim 1, wherein: the rotor punching body is provided with two or three unit motors which are arranged at intervals, and the same unit motor is symmetrically distributed along the axis of the rotor body.
3. A low noise permanent magnet synchronous motor rotor according to claim 1 or 2, characterized in that: the rotor punching sheet body is provided with a rotor groove, magnetic steel is arranged in the rotor groove, the unit motor with the U-shaped structure is provided with a double-layer U-shaped rotor groove, the double-layer U-shaped rotor groove comprises a U-shaped inner rotor groove and a U-shaped outer rotor groove, and an inner layer magnetic steel and an outer layer magnetic steel are respectively arranged in the U-shaped inner rotor groove and the U-shaped outer rotor groove; the unit motor of V type structure is equipped with V type rotor groove, is equipped with first, the second V type magnet steel in the V type rotor groove.
4. A low noise permanent magnet synchronous motor rotor according to claim 3, characterized in that: the rotor punching sheet body is divided into four equal parts, two parts which are symmetrical in pairs along the central axis of the rotor punching sheet body are provided with the same unit motors, and each unit motor is provided with two groups of V-shaped magnetic steels or two groups of double-layer U-shaped magnetic steels.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822189764.6U CN210350988U (en) | 2018-12-25 | 2018-12-25 | Low-noise permanent magnet synchronous motor rotor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822189764.6U CN210350988U (en) | 2018-12-25 | 2018-12-25 | Low-noise permanent magnet synchronous motor rotor |
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| CN210350988U true CN210350988U (en) | 2020-04-17 |
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| CN201822189764.6U Active CN210350988U (en) | 2018-12-25 | 2018-12-25 | Low-noise permanent magnet synchronous motor rotor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022047938A1 (en) * | 2020-09-01 | 2022-03-10 | 瑞声声学科技(深圳)有限公司 | Linear motor |
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2018
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022047938A1 (en) * | 2020-09-01 | 2022-03-10 | 瑞声声学科技(深圳)有限公司 | Linear motor |
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: Suzhou Heyu Finance Leasing Co.,Ltd. Assignor: SUZHOU YINGCI NEW ENERGY TECHNOLOGY CO.,LTD. Contract record no.: X2023980043152 Denomination of utility model: A Low Noise Permanent Magnet Synchronous Motor Rotor Granted publication date: 20200417 License type: Exclusive License Record date: 20231010 |
|
| PE01 | Entry into force of the registration of the contract for pledge of patent right | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: A Low Noise Permanent Magnet Synchronous Motor Rotor Effective date of registration: 20231012 Granted publication date: 20200417 Pledgee: Suzhou Heyu Finance Leasing Co.,Ltd. Pledgor: SUZHOU YINGCI NEW ENERGY TECHNOLOGY CO.,LTD. Registration number: Y2023980060823 |